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

Abstract

This terminal comprises a control unit that, in at least a portion of a specific frequency range in which a specific subcarrier interval is defined as a minimum subcarrier interval, or in a relevant frequency band that includes a lower frequency band than the specific frequency range, applies a target subcarrier interval that is lower than the specific subcarrier interval. The control unit applies, at least as part of an initial access method relating to the target subcarrier interval, a method that is different from an initial access method relating to the specific subcarrier interval.

Description

Technical Field

[0001] The present disclosure relates to a terminal that executes wireless communication, a base station, a wireless communication system, and a wireless communication method, and particularly to a terminal, a base station, a wireless communication system, and a wireless communication method that apply Subcarrier Spacing (SCS).

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the 5th generation mobile communication system (also referred to as 5G, New Radio (NR), or Next Generation (NG)), and is further promoting the standardization of the next generation, such as Beyond 5G, 5G Evolution, or 6G.

[0003] In the above-mentioned 5G, in Frequency Range (FR) 1, the use of Subcarrier Spacing (SCS) of 15 kHz, 30 kHz, and 60 kHz is assumed, and in FR2, the use of SCS of 60 kHz and 120 kHz is assumed (for example, Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] Under such circumstances, as a result of intensive studies, the inventors et al. have found that it may be possible to improve the frequency utilization efficiency by using a smaller subcarrier spacing (SCS) than the existing SCS.

[0006] Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a terminal, a base station, a wireless communication system, and a wireless communication method that can improve the frequency utilization efficiency.

[0007] The present disclosure is directed to a terminal comprising a control unit that applies a target subcarrier spacing lower than the specific subcarrier spacing in a target frequency band including at least a part of a specific frequency range in which the specific subcarrier spacing is defined as the minimum subcarrier spacing or a frequency band lower than the specific frequency range, wherein the control unit applies, as at least a part of an initial access method related to the target subcarrier spacing, a method different from the initial access method related to the specific subcarrier spacing.

[0008] The present disclosure is directed to a base station comprising a control unit that applies a target subcarrier spacing lower than the specific subcarrier spacing in a target frequency band including at least a part of a specific frequency range in which the specific subcarrier spacing is defined as the minimum subcarrier spacing or a frequency band lower than the specific frequency range, wherein the control unit applies, as at least a part of an initial access method related to the target subcarrier spacing, a method different from the initial access method related to the specific subcarrier spacing.

[0009] The present disclosure relates to a wireless communication system including a terminal and a base station. The terminal and the base station include a control unit that applies a target subcarrier interval lower than the specific subcarrier interval in at least a part of a specific frequency range in which the specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range. The control unit applies, as at least a part of an initial access method related to the target subcarrier interval, a method different from the initial access method related to the specific subcarrier interval. This is the gist of the present disclosure.

[0010] The present disclosure relates to a wireless communication method including a step of applying a target subcarrier interval lower than the specific subcarrier interval in at least a part of a specific frequency range in which the specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range, and a step of applying, as at least a part of an initial access method related to the target subcarrier interval, a method different from the initial access method related to the specific subcarrier interval. This is the gist of the present disclosure.

Brief Description of Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments will be described with reference to the drawings. Note that the same or similar reference numerals are assigned to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0013] [Embodiment] (1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system compliant with 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE 200).

[0014] Note that the wireless communication system 10 may also be a wireless communication system compliant with a system called Beyond 5G, 5G Evolution, or 6G.

[0015] NG-RAN 20 includes a radio base station 100A (hereinafter, gNB 100A) and a radio base station 100B (hereinafter, gNB 100B). Note that the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG. 1.

[0016] NG-RAN 20 actually includes a plurality of NG-RAN Nodes, specifically, gNBs (or ng-eNBs), and is connected to a core network (5GC, not shown) compliant with 5G. Note that NG-RAN 20 and 5GC may simply be expressed as "network".

[0017] gNB100A and gNB100B are radio base stations compliant with 5G and perform wireless communication with UE200 according to 5G. gNB100A, gNB100B, and UE200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a more directional beam BM by controlling radio signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that communicates with two or more transport blocks simultaneously between the UE and each of the two NG-RAN Nodes.

[0018] In addition, the wireless communication system 10 supports a plurality of frequency ranges (FR). FIG. 2 shows the frequency ranges used in the wireless communication system 10.

[0019] As shown in FIG. 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

[0020] ·FR1: 410 MHz to 7.125 GHz ·FR2: 24.25 GHz to 52.6 GHz In FR1, a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz may be used, and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 is at a higher frequency than FR1, and an SCS of 60 or 120 kHz (240 kHz may be included) may be used, and a bandwidth (BW) of 50 to 400 MHz may be used.

[0021] Note that the SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to the interval between one sub-carrier in the frequency domain.

[0022] Furthermore, the wireless communication system 10 also supports frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz up to 71 GHz or 114.25 GHz. Such high-frequency bands may be referred to as "FR2x" for convenience.

[0023] In the high-frequency band, the influence of phase noise becomes significant. Therefore, when using a band exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0024] FIG. 3 shows a configuration example of a radio frame, a sub-frame, and a slot used in the wireless communication system 10.

[0025] As shown in FIG. 3, one slot is composed of 14 symbols. The larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the intervals (frequencies) shown in FIG. 3. For example, 480 kHz, 960 kHz, etc. may be used.

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

[0027] Note that the time direction (t) shown in FIG. 3 may also be referred to as the time domain, symbol period, or symbol time. Also, the frequency direction may be referred to as the frequency domain, resource block, sub-carrier, bandwidth part (BWP), etc.

[0028] DMRS is a type of reference signal and is prepared for various channels. Here, unless otherwise specified, it may mean the DMRS for the downlink data channel, specifically, the PDSCH (Physical Downlink Shared Channel). However, the DMRS for the uplink data channel, specifically, the PUSCH (Physical Uplink Shared Channel), may be interpreted in the same way as the DMRS for the PDSCH.

[0029] DMRS can be used for channel estimation in the UE200 as part of a device, for example, coherent demodulation. DMRS may exist only in the resource blocks (RBs) used for PDSCH transmission.

[0030] DMRS may have multiple mapping types. Specifically, DMRS has mapping type A and mapping type B. In mapping type A, the first DMRS is placed in the second or third symbol of the slot. In mapping type A, DMRS may be mapped based on the slot boundary regardless of where the actual data transmission starts in the slot. The reason the first DMRS is placed in the second or third symbol of the slot may be interpreted as to place the first DMRS after the control resource sets (CORESETs).

[0031] In mapping type B, the first DMRS may be placed in the first symbol of the data allocation. That is, the position of DMRS may be given relatively with respect to where the data is placed rather than with respect to the slot boundary.

[0032] Also, the DMRS may have multiple types. Specifically, the DMRS has Type 1 and Type 2. Type 1 and Type 2 differ in the mapping in the frequency domain and the maximum number of orthogonal reference signals. Type 1 can output up to 4 orthogonal signals with a single-symbol DMRS, and Type 2 can output up to 8 orthogonal signals with a double-symbol DMRS.

[0033] (2) Functional Block Configuration of the Wireless Communication System Next, the functional block configuration of the wireless communication system 10 will be described.

[0034] First, the functional block configuration of the UE200 will be described.

[0035] Figure 4 is a functional block configuration diagram of the UE200. As shown in Figure 4, the UE200 includes a wireless signal transceiver 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transceiver 260, and a control unit 270.

[0036] The wireless signal transceiver 210 transmits and receives wireless signals according to NR. The wireless signal transceiver 210 is compatible with Massive MIMO, CA that bundles multiple CCs for use, and DC that enables simultaneous communication between the UE and two NG-RAN Nodes respectively.

[0037] The amplifier unit 220 is composed of 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. Also, the amplifier unit 220 amplifies the RF signal output from the wireless signal transceiver 210.

[0038] The modulation / demodulation unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100 or another gNB). In the modulation / demodulation unit 230, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied. Also, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0039] The control signal / reference signal processing unit 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.

[0040] Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). Also, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

[0041] The control signal / reference signal processing unit 240 performs processing using reference signals (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

[0042] DMRS is a reference signal (pilot signal) known between the base station and the terminal specific to each terminal for estimating the fading channel used for data demodulation. PTRS is a reference signal specific to each terminal for the purpose of estimating phase noise that becomes a problem in a high frequency band.

[0043] In addition to DMRS and PTRS, the reference signal may also include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for position information.

[0044] The channel also includes a control channel and a data channel. The control channel includes Physical Downlink Control Channel (PDCCH), Physical Uplink Control Channel (PUCCH), Random Access Channel (RACH), Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI), and Physical Broadcast Channel (PBCH), etc.

[0045] The data channel includes Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH), etc. Data means the data transmitted via the data channel. The data channel may be read as a shared channel.

[0046] Here, the control signal / reference signal processing unit 240 may receive downlink control information (DCI). The DCI includes fields that store, as existing fields, DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number), NDI (New Data Indicator), RV (Redundancy Version), and the like.

[0047] 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 is applied. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI is applied. The BWP that can be specified by the BWP indicator is set by the 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 is applied. The frequency domain resource is specified by the value stored in the FDRA field and the 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 is applied. The time domain resource is specified by the value stored in the TDRA field and the information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message. The time domain resource may be specified by the value stored in the TDRA field and the default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI is applied. The MCS is specified by the value stored in the MCS and the MCS table. The MCS table may be specified by the RRC message or may be specified 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 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.

[0048] For each predetermined communication destination (gNB100 or other gNB), the encoding / decoding unit 250 performs data splitting / concatenation, channel coding / decoding, etc.

[0049] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into a predetermined size and performs channel coding on the divided data. Further, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0050] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 260 performs the assembly / disassembly of PDU / SDU in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)). Further, the data transmission / reception unit 260 performs error correction and retransmission control of data based on Hybrid Automatic Repeat Request (HARQ).

[0051] The control unit 270 controls each functional block constituting the UE 200. In an embodiment, the control unit 270 configures a control unit that applies a target subcarrier spacing (hereinafter, target SCS) lower than the specific SCS in a target frequency band including at least a part of a specific frequency range in which a specific subcarrier spacing (hereinafter, specific SCS) is defined as a minimum subcarrier spacing or a frequency band lower than the specific frequency range. The control unit 270 applies a method different from the initial access method for the specific SCS as at least a part of the initial access method for the target SCS. The frequency utilization efficiency of the target SCS may be higher than that of the specific SCS.

[0052] For example, the specific frequency range may be FR1 described above. In such a case, the specific SCS may be 15 kHz. The target frequency band may include at least a part of FR1. The target frequency band may include a frequency band lower than FR1. The target SCS is 1 / 2 of the specific SCS (for example, 15 kHz) nIt may be an SCS (for example, 7.5 kHz, 3.75 kHz, 1.875 kHz, etc.) that satisfies the condition of (n is a positive integer), and it may also be an SCS that does not satisfy the condition of 1 / 2 of the specific SCS. n It may also be an SCS that does not satisfy the condition.

[0053] Second, the functional block configuration of gNB100 will be described.

[0054] FIG. 5 is a functional block configuration diagram of gNB100. As shown in FIG. 5, gNB100 includes a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0055] The receiving unit 110 receives various signals from the UE200. The receiving unit 110 may receive UL signals via PUCCH or PUSCH.

[0056] The transmitting unit 120 transmits various signals to the UE200. The transmitting unit 120 may transmit DL signals via PDCCH or PDSCH.

[0057] The control unit 130 controls gNB100. In an embodiment, the control unit 130 constitutes a control unit that applies a target SCS lower than the specific SCS in a target frequency band including at least a part of a specific frequency range in which the specific SCS is defined as the minimum SCS or a frequency band lower than the specific frequency range. The control unit 130 applies a method different from the initial access method for the specific SCS as at least a part of the initial access method for the target SCS. As described above, the frequency utilization efficiency of the target SCS may be higher than that of the specific SCS.

[0058] (3) Background Hereinafter, the background of the embodiment will be described. Here, CBW (Channel Bandwidth) will be described.

[0059] Specifically, as shown in FIG. 6, GB (Guard Band) is provided at both ends of the CBW, and the band excluding the GB within the CBW is the band that can be used for transmission. Such a band is set according to the number of RBs (Resource Blocks) (Transmission Bandwidth Configuration N in FIG. 6 RB ). The active RB (Transmission Bandwidth) used for actual transmission is set from within Transmission Bandwidth Configuration N RB . Transmission Bandwidth may also be referred to as BWP (Bandwidth Part).

[0060] First, in the existing mechanism, the ratio of the cyclic prefix (CP: Cyclic Prefix) length (hereinafter, CP Ratio) is the same regardless of the SCS. For example, the CP Ratio of Normal CP (hereinafter, NCP) is 144(160) / 2048 (about 6.6%). The CP Ratio of Extended CP is 512 / 2048 (20%).

[0061] Second, in the existing mechanism, the higher the SCS, the larger the GB, and the larger the bandwidth that cannot be used within the CBW. For example, when the CBW is 50 MHz, the available bandwidth within the CBW is as follows. With an SCS of 15 kHz, the available bandwidth is 48.6 MHz (= 270 RB * 12 SC (Subcarrier) * 15 kHz), and the ratio of the available bandwidth is 97.2% (48.6 MHz / 50 MHz). With an SCS of 30 kHz, the available bandwidth is 47.88 MHz (= 133 RB * 12 SC * 30 kHz), and the ratio of the available bandwidth is 95.76% (47.88 MHz / 50 MHz). With an SCS of 60 kHz, the available bandwidth is 46.8 (47.52) MHz (= 65 RB * 12 SC * 60 kHz), and the ratio of the available bandwidth is 93.6 (95.04)% (46.8 (47.52) MHz / 50 MHz). With an SCS of 120 kHz, the available bandwidth is 46.08 MHz (= 32 RB * 12 SC * 30 kHz), and the ratio of the available bandwidth is 92.16% (46.08 MHz / 50 MHz).

[0062] Third, in the existing mechanism, the upper limit of the CBW is determined for each SCS. For example, with an SCS of 15 kHz, the upper limit of the CBW is 50 MHz.

[0063] Under such circumstances, as a result of intensive studies, the inventors have found that the frequency utilization efficiency can be improved by introducing an SCS lower than the specific SCS (for example, 15 kHz) defined by FR1 in a target frequency band including at least a part of a specific frequency range (for example, FR1) or a frequency band lower than the specific frequency range.

[0064] (4) Assumed cases Hereinafter, the assumed cases of the embodiment will be described. Hereinafter, a case will be exemplified in which the specific frequency range is FR1, the specific SCS is 15 kHz, and the target SCS is 7.5 kHz. In the assumed case, a case will be exemplified in which an SCS of 7.5 kHz is introduced in a target frequency band including at least a part of FR1 or a frequency band lower than FR1.

[0065] However, the target SCS may be an SCS (for example, 7.5 kHz, 3.75 kHz, 1.875 kHz, etc.) that satisfies the condition of 1 / 2 of a specific SCS (for example, 15 kHz) n (n is a positive integer), or may be an SCS that does not satisfy the condition of 1 / 2 of the specific SCS. n

[0066] (4.1) CP Ratio The ratio of the cyclic prefix length (CP Ratio) used for the target SCS (7.5 kHz) may be lower than the ratio of the cyclic prefix length (CP Ratio of NCP) used for the specific SCS (15 kHz).

[0067] Here, the delay spread solved by the CP does not depend on the SCS, but is determined by the frequency band and the placement scenario. Therefore, even if the CP Ratio applied to the target SCS is made lower than the CP Ratio of the existing NCP, the delay spread can be appropriately solved and the frequency utilization efficiency can be increased.

[0068] (4.2) Number of FFT points The number of FFT (Fast Fourier Transform) points used for the target SCS may be more than the number of FFT points used for the specific SCS. For example, if the number of FFT points used for the specific SCS is 4096, the number of FFT points used for the target SCS may be 8192.

[0069] According to such a configuration, even when introducing an SCS lower than a specific SCS (for example, 15 kHz) defined in FR1, it is possible to use a wideband CBW as the CBW, and the frequency utilization efficiency can be increased. Furthermore, since a wideband CBW can be used as the CBW, there is also a possibility of suppressing an increase in the number of CCs in CA.

[0070] ​As the number of RBs per BW, a value larger than the maximum number of RBs in a specific SCS (e.g., 273) may be supported. In such a case, an FDRA field including a larger number of bits than the existing number of bits may be newly defined. Alternatively, without changing the number of bits of the FDRA field from the existing number of bits, the bits included in the FDRA field may be interpreted such that the granularity of the frequency resources represented by the bits is smaller than the existing granularity. Alternatively, a table and / or a frequency resource allocation method for determining the allocation of the frequency resources applied to the target SCS may be predefined in the radio communication system 10.

[0071] gNB100 may support an FFT point number larger than the FFT point number used in a specific SCS, and UE200 may not support an FFT point number larger than the FFT point number used in a specific SCS. In such a case, UE200 may not assume that the BWP of the target SCS is allocated across the entire CBW supported by gNB100. Also, when UE200 supports an FFT point number larger than the FFT point number used in a specific SCS, the information may be reported to gNB100.

[0072] (4.3) Application Conditions Conditions for applying the target subcarrier spacing may be defined. The application conditions may include conditions such as the band, frequency range, Duplex mode, Serving Cell type, etc. for which the target subcarrier spacing is applied. For example, the application conditions may include the condition that the target subcarrier spacing is applied to the BWP of an SCell (Secondary Cell).

[0073] (4.4) UE Capability UE Capability may be defined to implicitly or explicitly indicate whether the UE 200 supports the target subcarrier spacing. For example, whether the UE 200 supports the target subcarrier spacing may be implicitly indicated by the type of terminal, such as an IoT terminal (reduced capability), an IAB (IAB-MT)-MT (Mobile Termination), or an FWA (Fixed Wireless Access) terminal. Whether the UE 200 supports the target subcarrier spacing may also be implicitly indicated by other information elements included in the UE Capability.

[0074] (4.5) Symbol boundary The symbol boundary of a specific SCS may match the symbol boundary of the target SCS at a specific time interval. The specific time interval may be 0.5 ms or 1.0 ms. For example, in the time interval corresponding to 1 Slot (14 symbols) of a specific SCS, a case where 8 symbols are included as symbols of the target SCS is illustrated. The 8 symbols are realized by the CP Ratio being lower than the CP Ratio of the NPC. When the CP Ratio is the same as the CP Ratio of the NPC, it should be noted that 7 symbols are included as symbols of the target SCS in the time interval corresponding to 1 Slot (14 symbols) of the specific SCS. Under such a premise, the symbol boundary may be defined as follows.

[0075] First, as shown in FIG. 7, the symbol boundaries of the specific SCS (15 kHz) and the symbol boundaries of the target SCS (7.5 kHz) may coincide every 0.5 ms (i.e., 4 symbols of the target SCS). That is, the start positions of symbol #0 of the specific SCS and symbol #0 of the target SCS may be aligned, and the start positions of symbol #7 of the specific SCS and symbol #4 of the target SCS may also be aligned. In the case shown in FIG. 7, since the number of symbols of the target SCS included in the time interval corresponding to 1 Slot (14 - Symbol) of the specific SCS needs to be an even number, it is necessary to make the CP Ratio lower than the CP Ratio of the NPC.

[0076] Second, as shown in FIG. 8, the symbol boundaries of the specific SCS (15 kHz) and the symbol boundaries of the target SCS (7.5 kHz) may coincide every 1.0 ms (i.e., 8 symbols of the target SCS). That is, the start positions of symbol #0 of the specific SCS and symbol #0 of the target SCS are aligned, but the start positions of symbol #7 of the specific SCS and symbol #4 of the target SCS do not necessarily need to be aligned. In the case shown in FIG. 8, since it is not necessary to make the number of symbols of the target SCS included in the time interval corresponding to 1 Slot (14 - Symbol) of the specific SCS an even number, it is not necessary to make the CP Ratio lower than the CP Ratio of the NPC.

[0077] Here, cases where the symbol boundaries of the specific SCS and the symbol boundaries of the target SCS coincide in a time interval of 1 Slot or less of the specific SCS have been exemplified, but the embodiments are not limited thereto. The symbol boundaries of the specific SCS and the symbol boundaries of the target SCS may coincide in a time interval longer than 1 Slot of the specific SCS.

[0078] (4.6) UE Processing timeline When the target SCS is applied, a new time may be defined as the UE Processing timeline. Alternatively, when the target SCS is applied, the UE Processing timeline used for a specific SCS may be used as the UE Processing timeline.

[0079] The UE Processing timeline may include one or more Processing timelines selected from the PDSCH processing timeline (N1), PUSCH processing timeline (N2), HARQ-ACK multiplexing timeline (N3), CSI processing time (Z1, Z2, Z3), BWP switching delay, Beam switching delay, minimum gap for scheduling, and minimum gap for triggering.

[0080] Here, it should be noted that in the prior art, the lower the SCS, the longer the time is defined as the Processing timeline in absolute time. In the embodiment, attention is paid to the possibility that when the target SCS is applied, it may not be necessary to define a long time as the Processing timeline in absolute time. Such a possibility is considered in view of the evolution of device performance and the like.

[0081] (4.7)RS(Reference Signal) When the target SCS is applied, new resource positions, densities, and setting parameters may be defined as the resource position, density, and setting parameters of the RS.

[0082] Specifically, since the target SCS is lower than the specific SCS, the insertion density of the RS in the frequency direction for the target SCS may be lower than the insertion density of the RS in the frequency direction for the specific SCS. Since the symbol length of the target SCS is longer than the symbol length of the specific SCS, the insertion density of the RS in the time direction for the target SCS may be higher than the insertion density of the RS in the time direction for the specific SCS.

[0083] For example, as the Configuration type of the DMRS set when the target SCS is applied, a new type with a lower insertion density of the DMRS in the frequency direction than in the prior art may be defined. Alternatively, as the PTRS set when the target SCS is applied, a PTRS with a lower insertion density in the frequency direction than in the prior art may be defined.

[0084] (4.8) Number of symbols The number of symbols included in one Slot of the target SCS may be different from the number of symbols included in one Slot of the specific SCS (for example, 14). This is because by reducing the CP Ratio applied to the target SCS, it is necessary to newly define the definition of one Slot of the target SCS and the number of symbols included in one Slot of the target SCS.

[0085] For example, when one Slot is defined as 2 ms, 16 or 15 symbols may be included in 2 ms. When one Slot is defined as 1 ms, 8 symbols may be included in 1 ms. When one Slot is defined as 0.5 ms, 4 symbols may be included in 0.5 ms.

[0086] In such a case, a TDRA field including a larger number of bits than the existing number of bits may be newly defined. Alternatively, without changing the number of bits of the TDRA field, the bits included in the TDRA field may be interpreted such that the granularity of the frequency resources represented by the bits is smaller than the existing granularity. Alternatively, a table for determining the allocation of time resources applied to the target SCS and / or a time resource allocation method may be predefined in the wireless communication system 10.

[0087] For the symbols included in the target SCS, DL, FL, and UL may be configurable. DL means the symbol used for DL, UL means the symbol used for UL, and FL means the symbol used for either DL or UL. DL, FL, and UL may be set by RRC parameters, and a part of them (for example, the symbols designated as FL by RRC) may be updated by DCI or MAC CE.

[0088] As the format of the Slot used in the target SCS, a new Slot format may be defined. Alternatively, the format of the Slot used in the target SCS may be specified by changing the interpretation of the existing Slot format. As the existing Slot format, the Slot format defined in Table 11.1.1-1 of 3GPP TS38.213 V16.4.0 may be used. For example, when the number of symbols included in one Slot of the target SCS is less than 14, a part of the existing Slot format may be extracted. When the number of symbols included in one Slot of the target SCS is more than 14, additional symbols may be inserted into the existing Slot format. The type of the additional symbols (DL, FL, UL) may be specified by a parameter notified separately from the existing Slot format, or may be specified by the type of the symbols included in the existing Slot format.

[0089] (5) Initial access method Hereinafter, the initial access method for the target SCS will be described. As described above, at least a part of the initial access method for the target SCS is different from the initial access method for the target SCS.

[0090] (5.1) First method In the first method, a case where the target SCS is not supported as the SCS of the SSB (Synchronization Signal / PBCH Block) will be described. The SSB is an example of a synchronization signal and includes the MIB (Master Information Block). That is, in the initial access method of the target SCS, the existing SSB is used. Therefore, when the BWP of the target SCS is set as the active BWP, the UE200 uses a measurement gap to monitor the SSB existing in the band other than the active BWP.

[0091] In such a case, the following options can be considered.

[0092] In Option 1, the target SCS is not supported as the SCS of CORESET#0. CORESET#0 is an example of a control resource set and is used for the scheduling of SIB (System Information Block) 1. In Option 1, the UE200 performs initial access using the SSB / CORESET#0 of the existing SCS (for example, a specific SCS). The UE200 may perform Measurement, ANR (Automatic Neighbor Relation), etc. using the SSB / CORESET#0 of the existing SCS. In other words, it is not assumed that the UE200 performs operations such as initial access using the target SCS.

[0093] In Option 2, the target SCS is supported as the SCS of CORESET #0. In Option 2, when the UE 200 detects the SSB of an existing SCS (e.g., a specific SCS), it may recognize that the target SCS is supported as the SCS of CORESET #0 based on the information elements included in the MIB. In such a case, the reading replacement of specific information elements included in the MIB may be executed. The reading replacement may be executed in a specific frequency band or a specific band. The specific information element may be one or more information elements selected from systemFrameNumber, subCarrierSpacingCommon, pdcch-ConfigSIB1, cellBarred, and spare, or may be other information elements.

[0094] For example, when the specific information element is systemFrameNumber, the UE 200 may recognize that the target SCS is supported as the SCS of CORESET #0 by an information element (a part of systemFrameNumber) representing the unused part of the SFN of the radio frame, assuming that a part of the SFN of the radio frame is not used. In other words, a part of systemFrameNumber is read as an information element indicating whether the target SCS is supported as the SCS of CORESET #0.

[0095] Alternatively, when the specific information element is cellBarred, the UE 200 may recognize that the target SCS is supported as the SCS of CORESET #0 by cellBarred, assuming that cellBarred does not represent whether the use of the cell is prohibited. In other words, cellBarred is read as an information element indicating whether the target SCS is supported as the SCS of CORESET #0. In such a case, the UE 200 may determine whether the use of the cell is prohibited based on the information elements included in SIB1.

[0096] In Option 3, although the target SCS is not supported as the SCS of CORESET #0, SIB1 may include an information element indicating whether the target SCS is supported as the SCS of the initial DL / UL BWP. In such a case, apart from the information element indicating that the SCS of the initial DL / UL BWP is the target SCS, an information element indicating that the SCS of the initial DL / UL BWP is an existing SCS (for example, a specific SCS) may be notified. The information element indicating that the SCS of the initial DL / UL BWP is an existing SCS may be considered as an information element used by a UE200 that does not support the target SCS. When an information element indicating that the SCS of the initial DL / UL BWP is the target SCS is notified, a UE200 that does not support the target SCS may perform a selection of another cell or another frequency. When an information element indicating that the SCS of the initial DL / UL BWP is an existing SCS is not notified, a UE200 that does not support the target SCS may perform a selection of another cell or another frequency.

[0097] (5.2) Second method The second method will describe the case where the target SCS is supported as the SCS of the SSB (Synchronization Signal / PBCH Block). The SSB is an example of a synchronization signal and includes the MIB. That is, in the initial access method of the target SCS, the SSB used for the target SCS is used.

[0098] In such a case, as the mapping pattern of the SSB used for the target SCS, a mapping pattern obtained by scaling the mapping pattern of the SSB used for an existing SCS (for example, a specific SCS) to be used for the target SCS may be used. As the mapping pattern of the SSB used for an existing SCS, Case A or Case B defined in §4.1 of 3GPP TS38.213 V16.4.0 may be used. Alternatively, a new mapping pattern may be defined as the mapping pattern of the SSB used for the target SCS.

[0099] The SSB used in the target SCS may not be multiplexed with CORESET#0 of an existing SCS (for example, a specific SCS). In other words, the SSB used in the target SCS may be multiplexed with CORESET#0 of the target SCS. Alternatively, at least a part of the SSB used in the target SCS may be multiplexed with at least a part of CORESET#0 of the existing SCS. When multiplexing between the SSB used in the target SCS and CORESET#0 of the existing SCS is allowed, only multiplexing with CORESET#0 of the existing SCS closest to the target SCS may be allowed.

[0100] In such a case, the following options can be considered.

[0101] In Option 1, in the initial access related to the target SCS, the use of the SSB used in the target SCS is not assumed. In Option 1, the UE200 may execute monitoring of the SSB used in the target SCS when explicitly instructed to search for the SSB used in the target SCS. The information element indicating to search for the SSB used in the target SCS may be MeasObjectNR.

[0102] In Option 2, in the initial access related to the target SCS, the use of the SSB used in the target SCS is assumed. In Option 2, the UE200 may execute monitoring of the SSB used in the target SCS in a specific frequency band or a specific band. The interval of the synchronization raster for searching for the SSB used in the target SCS may be wider than the interval of the synchronization raster for searching for the SSB used in the existing SCS (for example, a specific SCS).

[0103] (6) Operations and Effects In an embodiment, the UE 200 and the gNB 100 apply a target SCS lower than a specific SCS in a target frequency band including at least a part of FR1 where a specific SCS (minimum SCS) is defined or a frequency band lower than FR1. The UE 200 and the gNB 100 apply a method different from the initial access method for the specific SCS as at least a part of the initial access method for the target SCS. According to such a configuration, when newly introducing the target SCS to improve frequency utilization efficiency, the initial access for the target SCS can be appropriately executed.

[0104] (7) Modification Example 1 Hereinafter, Modification Example 1 of the embodiment will be described. Hereinafter, the differences from the embodiment will be mainly described.

[0105] In the embodiment, a case where the specific frequency range is FR1, the specific SCS is 15 kHz, and the target frequency band includes at least a part of FR1 or a frequency band lower than FR1 has been described. In contrast, in Modification Example 1, a case where the specific frequency range is FR2, the specific SCS is 60 kHz, and the target frequency band includes at least a part of FR2 or a frequency band lower than FR2 will be described.

[0106] In Modification Example 1, the target SCS may be an SCS (for example, 30 kHz, 15 kHz, etc.) that satisfies the condition of 1 / 2 of the specific SCS (for example, 60 kHz), n (n is a positive integer), or may be an SCS that does not satisfy the condition of 1 / 2 of the specific SCS. Even in such a case, at least one of the first method and the second method described above may be applied. n

[0107] Similar to the embodiments, when the target SCS is supported as the SCS of the SSB, as the mapping pattern of the SSB used in the target SCS, the existing SSB mapping patterns (for example, Case A to Case C defined in §4.1 of 3GPP TS38.213 V16.4.0) may be used as they are, or the mapping pattern obtained by scaling the existing SSB mapping patterns (for example, Case D to Case E defined in §4.1 of 3GPP TS38.213 V16.4.0) to be used in the target SCS may be used. Alternatively, as the mapping pattern of the SSB used in the target SCS, a new mapping pattern may be defined.

[0108] The maximum number of SSBs of the target SCS may be less than the maximum number of SSBs of the existing SCS (for example, 64). In such a case, all SSB candidate positions regarding the SSBs of the target SCS may be defined so as to fit within the SSB transmission period (for example, 5 ms). Alternatively, the maximum number of SSBs of the target SCS may be the same as the maximum number of SSBs of the existing SCS (for example, 64). In such a case, all SSB candidate positions regarding the SSBs of the target SCS may be defined so as to fit within a period longer than the existing SSB transmission period (for example, 5 ms). That is, a 5 ms SSB transmission period may not be supported, and a time longer than the existing SSB transmission period (for example, 5 ms) may be supported as the SMTC window duration.

[0109] One or more configurations selected from the above-mentioned (4.1) CP Ratio, (4.2) number of FFT points, (4.3) application conditions, (4.4) UE capability, (4.5) symbol boundary, (4.6) UE Processing timeline, (4.7) RS, and (4.8) number of symbols may be applied.

[0110] Under such a premise, when the applicable SCSs (15 kHz, 30 kHz) for FR1 are used as the target SCS, a configuration similar to that of the applicable SCS for FR1 may be applied. Alternatively, even when the applicable SCSs (15 kHz, 30 kHz) for FR1 are used as the target SCS, a configuration different from that of the applicable SCS for FR1 (at least any one of (4.1) to (4.8) described above) may be applied.

[0111] (8) Modification Example 2 In the following, Modification Example 2 of the embodiment will be described. In the following, the differences from the embodiment will be mainly described.

[0112] In Modification Example 2, the case where the target SCS is supported as the SCS of SSB or CORESET#0 will be further described.

[0113] In such a case, a new CORESET#0 configuration may be defined. When the target SCS is supported as the SCS of both SSB and PDSCH, a new first CORESET#0 configuration may be defined. When the target SCS is supported as the SCS of either SSB or PDSCH, a new second CORESET#0 configuration may be defined. Both the first CORESET#0 configuration and the second CORESET#0 configuration may be defined.

[0114] The first CORESET#0 configuration or the second CORESET#0 configuration may have different parameters as compared with the existing CORESET#0 configuration of the SCS used in the same frequency band as the target SCS. The parameters may be one or more parameters selected from a multiplexing pattern, the number of CORESET#0 RBs, and an RB Offset. For example, in FR1, the multiplexing pattern of the first CORESET#0 configuration or the second CORESET#0 configuration may include a value larger than the existing value (e.g., 2 / 3). In FR1, the number of CORESET#0 RBs of the first CORESET#0 configuration or the second CORESET#0 configuration may include a value larger than the existing value (e.g., 96).

[0115] Also, a Search Space Zero configuration may be newly defined. When the target SCS is supported as the SCS for both the SSB and the PDSCH, the first Search Space Zero configuration may be newly defined. When the target SCS is supported as the SCS for either the SSB or the PDSCH, the second Search Space Zero configuration may be newly defined. Both the first Search Space Zero configuration and the second Search Space Zero configuration may be defined.

[0116] The first Search Space Zero configuration or the second Search Space Zero configuration may have different parameters as compared with the Search Space Zero configuration of the existing SCS used in the same frequency band as the target SCS. The parameters may be one or more parameters selected from the Number of search space sets per slot, M, and O. For example, the Number of search space sets per slot and M of the first Search Space Zero configuration or the second Search Space Zero configuration may be limited to 1. The O of the first Search Space Zero configuration or the second Search Space Zero configuration may include a new value (a value other than 0, 2, 5, 7).

[0117] (9) Other embodiments As described above, the content of the present invention has been described along with the embodiments. However, it is obvious to those skilled in the art that the present invention is not limited to these descriptions, and various modifications and improvements are possible.

[0118] In the embodiments, terms such as a specific SCS, a specific frequency range, a target frequency band, and a target SCS have been used for description. However, the embodiments are not limited thereto. "Specific" may be read as "first", and "target" may be read as "second". Alternatively, "specific" may be read as "existing", and "target" may be read as "new". Alternatively, "target" may be read as "low".

[0119] In an embodiment, the initial access method for the target SCS is different from the initial access method for a specific SCS in at least one of support for an SSB and support for CORESET #0. Here, the aspect in which the initial access method for the target SCS is different from the initial access method for the specific SCS may include an aspect in which the configuration of the SSB is different, or may include an aspect in which the configuration of CORESET #0 is different.

[0120] The block diagrams (FIGS. 4 and 5) used in the description of the above-described embodiment show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0121] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit is called a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0122] Furthermore, the above-described gNB 100 and UE 200 (the device) may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 9 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 9, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0123] In the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0124] Each functional block of the device (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0125] Also, each function in the device is realized by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, and then the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0126] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.

[0127] Further, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. Further, the above various processes 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. Note that the program may be transmitted from a network via a telecommunication line.

[0128] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. capable of executing the method according to an embodiment of the present disclosure.

[0129] Storage 1003 is a computer-readable recording medium and may be composed of, for example, at least one of an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. Storage 1003 may be referred to as an auxiliary storage device. The above-described recording medium may be, for example, a database, a server, or other appropriate media including at least one of the memory 1002 and the storage 1003.

[0130] The communication device 1004 is hardware (a transmission / reception device) for performing communication 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, a communication module, etc.

[0131] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0132] 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 an external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0133] Also, 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 for each device.

[0134] 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), a Field Programmable Gate Array (FPGA), etc., and some or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0135] Also, 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper 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. Also, 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, etc.

[0136] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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), other suitable systems, and next-generation systems extended based on these. Further, a plurality of systems may be combined and applied (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

[0137] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0138] The specific operations assumed to be performed by the base station in the present disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal can clearly be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, an MME or an S-GW, etc.). Although the case where there is one other network node other than the base station was exemplified above, a combination of a plurality of other network nodes (for example, an MME and an S-GW) may also be possible.

[0139] Information, signals (such as information) can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). They may be input and output via a plurality of network nodes.

[0140] 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 can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

[0141] The determination may be made by a value represented by 1 bit (0 or 1), or by a Boolean value (true or false), or by a numerical comparison (for example, comparison with a predetermined value).

[0142] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0143] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0144] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, fiber optic cables, twisted pairs, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwaves, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0145] 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., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0146] 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). Also, a signal may be a message. Also, a Component Carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0147] The terms "system" and "network" used in this disclosure are used interchangeably.

[0148] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or another corresponding piece of information. For example, a radio resource may be indicated by an index.

[0149] The names used for the above-described parameters are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0150] In the present 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0151] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0152] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station that provides communication services in this coverage and a base station subsystem.

[0153] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0154] 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 term.

[0155] 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. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does 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.

[0156] In addition, the base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same). For example, for a configuration in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station may be configured as functions of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0157] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as functions of the base station.

[0158] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe.

[0159] A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (for example, 1 ms) that does not depend on numerology.

[0160] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0161] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on a numerology.

[0162] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A Physical Downlink Shared Channel (PDSCH) (or Physical Uplink Shared Channel (PUSCH)) transmitted in a time unit larger than a mini-slot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0163] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for signal transmission. Different names corresponding to each of them may be used.

[0164] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in existing LTE, or 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 called a slot, a mini-slot, etc. instead of a sub-frame.

[0165] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used at each user terminal) to each user terminal in units of TTI. Note that the definition of TTI is not limited to this.

[0166] TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling and link adaptation. Note that when TTI is given, the time interval (e.g., the number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0167] Note that when one slot or one mini-slot is called TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0168] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, slot, etc.

[0169] Note that a long TTI (e.g., a normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0170] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0171] Also, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0172] Note that one or more RBs may be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0173] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource area of 1 subcarrier and 1 symbol.

[0174] A Bandwidth Part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. A PRB is defined in a certain BWP and may be numbered within the BWP.

[0175] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured within one carrier for a UE.

[0176] At least one of the configured BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0177] The structures such as the radio frames, subframes, slots, minislots, and symbols described above 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, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0178] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can 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 can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in the present disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0179] The reference signal can also be abbreviated as Reference Signal (RS) and may be called a Pilot depending on the applicable standard.

[0180] In the present disclosure, the description "based on" does not mean "only based on" unless otherwise specified. In other words, the description "based on" means both "only based on" and "at least based on".

[0181] In the configuration of each of the above devices, the "means" may be replaced with a "section", "circuit", "device", etc.

[0182] Any reference to an element using designations such as "first", "second", etc. used in the present disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be employed there, or that the first element must precede the second element in any form.

[0183] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Furthermore, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0184] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0185] As used herein, the terms "determining" and "deciding" may encompass a variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". "Determining" and "deciding" may also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory), and considering something as having been "determined" or "decided". "Determining" and "deciding" may further include resolving, selecting, choosing, establishing, comparing, etc., and considering something as having been "determined" or "decided". That is, "determining" and "deciding" may include considering something as having been determined or decided through some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0186] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separated" and "coupled" may be interpreted in the same way as "different".

[0187] As described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning for the present disclosure.

Explanation of Signs

[0188] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Receiver 120 Transmitter 130 Control unit 200 UE 210 Wireless signal transceiver 220 Amplifier unit 230 Modem unit 240 Control signal / reference signal processing unit 250 Encoder / decoder 260 Data transceiver 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

1. In a target frequency band including at least a part of a specific frequency range in which a specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range, a control unit is provided that applies a target subcarrier interval lower than the specific subcarrier interval. The control unit applies, as at least a part of an initial access method for the target subcarrier interval, a method different from the initial access method for the specific subcarrier interval. The initial access method for the target subcarrier interval is different from the initial access method for the specific subcarrier interval in terms of support for a synchronization signal, a terminal.

2. In a target frequency band including at least a part of a specific frequency range in which a specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range, a control unit is provided that applies a target subcarrier interval lower than the specific subcarrier interval. The control unit applies, as at least a part of an initial access method for the target subcarrier interval, a method different from the initial access method for the specific subcarrier interval. The initial access method for the target subcarrier interval is different from the initial access method for the specific subcarrier interval in terms of support for a synchronization signal, a base station.

3. A terminal and a base station are provided. The terminal and the base station are provided with a control unit that applies a target subcarrier interval lower than the specific subcarrier interval in a target frequency band including at least a part of a specific frequency range in which a specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range. The control unit applies, as at least a part of an initial access method for the target subcarrier interval, a method different from the initial access method for the specific subcarrier interval. The initial access method for the target subcarrier interval is different from the initial access method for the specific subcarrier interval in terms of support for a synchronization signal, a radio communication system.

4. Applying a target subcarrier interval lower than the specific subcarrier interval in a target frequency band including at least a part of a specific frequency range in which a specific subcarrier interval is defined as the minimum subcarrier interval or a frequency band lower than the specific frequency range. As at least part of the initial access method for the target subcarrier spacing, applying a method different from the initial access method for the specific subcarrier spacing; The initial access method for the target subcarrier spacing is a wireless communication method that is different from the initial access method for the specific subcarrier spacing in terms of support for synchronization signals.

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