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

Abstract

This terminal is provided with a control unit which executes, when a base station sets a broadband carrier bandwidth that is broader than a maximum carrier bandwidth supported by the terminal, communication allowing use of second frequency resources which are higher in number than the number of first frequency resources that the base station can use on the assumption that the terminal uses the broadband carrier bandwidth.

Description

[Technical field]

[0001] The present disclosure relates to a terminal, a base station, a wireless communication system, and a wireless communication method that perform wireless communication, and in particular to a terminal, a base station, a wireless communication system, and a wireless communication method that perform communication in a CBW (Channel Bandwidth) that a base station sets for the terminal. [Background technology]

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

[0004] [Non-Patent Document 1] 3GPP TS38.101-1 V17.0.0 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; User Equipment (UE) radio transmission and reception; Part 1: Range 1 Standalone (Release 17), 3GPP, December 2020 Summary of the Invention

[0005] Under such a background, the inventors, as a result of intensive research, have focused on the fact that when the CC (Component Carrier) bandwidth set by the base station for the terminal is wider than the maximum CC bandwidth supported by the terminal, only one BWP (Bandwidth Part) can be activated within the CC bandwidth set by the base station. Furthermore, the inventors have found the possibility of improving frequency utilization efficiency by focusing on such a new point.

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

[0007] The present disclosure provides a terminal that includes, when a base station sets a wideband carrier bandwidth wider than a maximum carrier bandwidth supported by the terminal, a control unit that executes communication capable of utilizing a second number of frequency resources that is greater than a first number of frequency resources available to the base station on the assumption that the terminal utilizes the wideband carrier bandwidth.

[0008] The present disclosure provides a base station, comprising: a control unit that, when the base station sets a wideband carrier bandwidth wider than a maximum carrier bandwidth supported by a terminal, executes communication capable of utilizing a second number of frequency resources that is greater than a first number of frequency resources available to the base station on the assumption that the terminal utilizes the wideband carrier bandwidth.

[0009] The present disclosure provides a wireless communication system comprising a terminal and a base station, wherein the terminal and the base station comprise a control unit that, when the base station sets a wideband carrier bandwidth wider than a maximum carrier bandwidth supported by the terminal, executes communication capable of utilizing a second number of frequency resources that is greater than a first number of frequency resources available to the base station on the assumption that the terminal utilizes the wideband carrier bandwidth.

[0010] The present disclosure provides a wireless communication method, comprising: when a base station sets a wideband carrier bandwidth wider than a maximum carrier bandwidth supported by a terminal, performing communication in which a second number of frequency resources greater than a first number of frequency resources available to the base station is available on the assumption that the terminal uses the wideband carrier bandwidth. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. As shown in FIG. [Diagram 3] FIG. 3 is a diagram showing an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. As shown in FIG. [Figure 4] FIG. 4 is a functional block diagram of UE 200. [Diagram 5] Figure 5 is a functional block diagram of gNB100. [Figure 6] FIG. 6 is a diagram for explaining the background. [Figure 7] FIG. 7 is a diagram for explaining the existing technology. [Figure 8] FIG. 8 is a diagram for explaining the existing technology. [Figure 9] FIG. 9 is a diagram for explaining an application scene. [Figure 10] FIG. 10 is a diagram showing an example of the hardware configuration of gNB100 and UE200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an embodiment 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 the description thereof will be omitted as appropriate.

[0013] [Embodiment] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall 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 200).

[0014] The wireless communication system 10 may be a wireless communication system conforming to a standard called Beyond 5G, 5G Evolution, or 6G.

[0015] The 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.

[0016] 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."

[0017] The gNB100A and the gNB100B are radio base stations conforming to 5G, and perform radio communication conforming to 5G with the UE 200. The gNB100A, the gNB100B, and the 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 uses a bundle of multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates with two or more transport blocks between the UE and each of two NG-RAN Nodes.

[0018] The wireless communication system 10 also supports a plurality of frequency ranges (FR).

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

[0020] FR1: 410MHz~7.125GHz FR2: 24.25GHz~52.6GHz 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 or 120 kHz (240 kHz may be included) and a bandwidth (BW) of 50 to 400 MHz.

[0021] The SCS may be interpreted as a numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier interval 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 above 52.6 GHz up to 71 GHz or 114.25 GHz. For convenience, such high frequency bands may be referred to as "FR2x."

[0023] In order to solve the problem of the increased effect of phase noise in high frequency bands, when using bands above 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with larger Sub-Carrier Spacing (SCS) may be applied.

[0024] FIG. 3 shows an example of the configuration of radio frames, subframes, and slots used in the radio communication system 10. In FIG.

[0025] As shown in Fig. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS is, the shorter the symbol period (and slot period) is. The SCS is not limited to the interval (frequency) 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 (for example, 28 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] DMRS is a kind of reference signal and is prepared for various channels. Here, unless otherwise specified, it may mean a downlink data channel, specifically, a DMRS for a PDSCH (Physical Downlink Shared Channel). However, a DMRS for an uplink data channel, specifically, a DMRS for a PUSCH (Physical Uplink Shared Channel) may be interpreted as being the same as a DMRS for a PDSCH.

[0029] The DMRS may be used for channel estimation at a device, for example, as part of coherent demodulation, at the UE 200. The DMRS may only be present in resource blocks (RBs) used for PDSCH transmission.

[0030] The DMRS may have multiple mapping types. Specifically, the 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 a slot. In mapping type A, the DMRS may be mapped with respect to a slot boundary regardless of where in the slot the actual data transmission starts. The reason why the first DMRS is placed in the second or third symbol of a slot may be interpreted as being to place the first DMRS after a control resource set (CORESET).

[0031] In mapping type B, the first DMRS may be placed in the first symbol of the data allocation, i.e., the position of the DMRS may be given relative to where the data is placed, rather than relative to a slot boundary.

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

[0033] (2) Functional block configuration of 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 UE 200 will be described.

[0035] Fig. 4 is a functional block diagram of the UE 200. As shown in Fig. 4, the UE 200 includes a radio signal transmitting / receiving unit 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 transmitting / receiving unit 260, and a control unit 270.

[0036] The radio signal transmission / reception unit 210 transmits and receives radio signals conforming to NR. The radio signal transmission / reception unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and each of two NG-RAN nodes.

[0037] 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 modem unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the wireless signal transmitting / receiving unit 210.

[0038] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100 or other 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 uplink (UL) but also for downlink (DL).

[0039] The control signal / reference signal processor 240 executes 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 processor 240 receives various control signals, for example, radio resource control layer (RRC) control signals, transmitted from the gNB 100 via a predetermined control channel. In addition, the control signal / reference signal processor 240 transmits various control signals to the gNB 100 via a predetermined control channel.

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

[0042] DMRS is a known reference signal (pilot signal) between a base station and a terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, which is an issue in high frequency bands.

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

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

[0045] The data channel includes a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH), etc. Data means data transmitted via the data channel. The data channel may be read as a shared channel.

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

[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 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 is applied. 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 is applied. 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 is applied. 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 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 or not. 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] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding, etc. for each predetermined communication destination (gNB100 or other gNB).

[0049] 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, and decodes the data output from the modem unit 230 and concatenates the decoded data.

[0050] The data transmission / reception unit 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / disassembly of 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)). In addition, the data transmission / reception unit 260 performs data error correction and retransmission control based on HARQ (Hybrid Automatic Repeat Request).

[0051] The control unit 270 controls each functional block constituting the UE 200. In the embodiment, when the gNB 100 sets a wideband carrier bandwidth wider than the maximum carrier bandwidth supported by the UE 200, the control unit 270 constitutes a control unit that executes communication capable of using a second number of frequency resources that is greater than the first number of frequency resources available to the gNB 100 on the assumption that the terminal uses the wideband carrier bandwidth.

[0052] Here, the maximum carrier bandwidth supported by the UE 200 is the maximum CC bandwidth supported by the UE 200. The wideband carrier bandwidth is the wideband CC bandwidth that the gNB 100 sets for the UE 200. The maximum CC bandwidth may be referred to as a maximum CBW (Channel Bandwidth), and the wideband CC bandwidth may be referred to as a wideband CBW.

[0053] When a wideband carrier bandwidth wider than the maximum carrier bandwidth supported by UE 200 is set, control unit 270 may execute communication using two or more specific bandwidths set in the wideband carrier bandwidth with the maximum carrier bandwidth as the upper limit. The subcarrier spacing (hereinafter, SCS) applied to each of the two or more specific bandwidths is the same. The number of the two or more specific bandwidths may be equal to or less than the upper limit number of CCs supported by UE 200 in CA.

[0054] However, since the two or more specific bandwidths are bandwidths set within one CC bandwidth set by the gNB 100, the subcarrier spacing (hereinafter, SCS) applied to each of the two or more specific bandwidths is the same. Therefore, the specific bandwidth is a different concept from a CC to which a different SCS can be applied.

[0055] Furthermore, since the two or more specific bandwidths are bandwidths set within one CC bandwidth set by the gNB 100, the two or more specific bandwidths can be processed by one FFT (Fast Fourier Transform), and one serving cell is set for the two or more specific bandwidths. Therefore, the specific bandwidth is a different concept from the CC that needs to be processed by separate FFTs. The specific bandwidth is a different concept from the CC in which separate serving cells are set.

[0056] Secondly, we will explain the functional block configuration of gNB100.

[0057] 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.

[0058] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive a UL signal via a PUCCH or a PUSCH.

[0059] The transmitter 120 transmits various signals to the UE 200. The transmitter 120 may transmit the DL signal via the PDCCH or the PDSCH.

[0060] The control unit 130 controls the gNB 100. In the embodiment, the control unit 130 configures a control unit that, when the gNB 100 sets a wideband CC bandwidth wider than the maximum CC bandwidth supported by the UE 200, executes communication that can use a second number of frequency resources that is greater than the first number of frequency resources that the gNB 100 can use on the assumption that the terminal uses the wideband CC bandwidth.

[0061] (3) Background The background of the embodiment will be described below. Here, the CBW will be described.

[0062] Specifically, as shown in FIG. 6, a CBW has a GB (Guard Band) at both ends, and the band within the CBW excluding the GB is the band that can be used for transmission. Such a band is set by the number of RBs (Resource Blocks) (Transmission Bandwidth Configuration N in FIG. 6). RB The active RB (Transmission Bandwidth) used for actual transmission is Transmission Bandwidth Configuration N RB The Transmission Bandwidth may be referred to as BWP (Bandwidth Part).

[0063] First, an upper limit for the CBW (hereinafter referred to as the maximum CBW) is set for each SCS. For example, if the SCS is 15 kHz in FR1, the maximum CBW is 50 MHz. If the SCS is 30 kHz in FR1, the maximum CBW is 100 MHz. If the SCS is 60 kHz in FR1, the maximum CBW is 200 MHz. If the SCS is 60 kHz in FR2, the maximum CBW is 200 MHz. If the SCS is 120 kHz in FR2, the maximum CBW is 400 MHz. When using a bandwidth wider than the maximum CBW, it is necessary to use CA, which bundles together two or more CCs.

[0064] Secondly, even if a wideband CBW wider than the maximum CBW supported by UE200 is assigned to a single operator (e.g., gNB100), it is necessary to provide GBs at both ends of the CBW supported by UE200.

[0065] Third, the maximum CBW for each SCS is defined so that the number of FFT points is equal to or less than a specific number of points (for example, 4096). The specific number of points depends on the device performance of the UE 200 and the device performance of the gNB 100.

[0066] Against this background, the inventors, after careful consideration, focused on cases in which gNB100 sets a wideband CC bandwidth wider than the maximum CC bandwidth supported by UE200, and discovered that frequency utilization efficiency can be improved in such cases.

[0067] (4) Existing technologies The following describes the existing technology of the embodiment. Here, a case where a 120 kHz SCS is used in FR2 is illustrated. In this case, when the CBW is 400 MHz, the number of frequency resources (hereinafter, the number of RBs) is 264. When the CBW is 100 MHz, the number of RBs is 66.

[0068] Under these assumptions, consider a case in which the wideband CBW (wideband CC bandwidth) that gNB100 can set is 400 MHz, the maximum CBW supported by UE200 is 100 MHz, and the upper limit number of CCs supported by UE200 in CA is 4.

[0069] For example, consider the case where CA is performed by aggregating four CCs using a CBW of 100 MHz. As shown in Fig. 7, in CA aggregating four CCs, a 400 MHz band can be used, but the number of RBs obtained by CA is 264 (= 66 × 4), which is the same as the case where the CBW is 400 MHz.

[0070] Alternatively, consider a case where a wideband CBW of 400 MHz is set. As shown in Fig. 8, since the maximum CBW supported by UE 200 is 100 MHz, the bandwidth available to UE 200 is up to a BWP of 100 MHz within the wideband CBW.

[0071] Taking note of such existing techniques, the inventors conducted extensive research and came to the following conclusions.

[0072] First, we focused on the possibility of improving frequency utilization efficiency by effectively utilizing GB between CCs when CA is implemented.

[0073] Secondly, due to implementation reasons such as the number of FFT points and wideband filters, it is difficult for both UE200 and gNB100 to support a wideband CBW such as 400 MHz, and we focused on the possibility that gNB100 can set a wideband CBW, but UE200 does not set a wideband CBW. Even in existing technologies, support for a CBW of 400 MHz in FR2 is optional.

[0074] Thirdly, even if both UE200 and gNB100 support a wideband CBW such as 400 MHz, in existing technologies there are cases where the GB width is determined to be proportional to the CBW, and this may result in low frequency utilization efficiency.

[0075] Fourth, we noticed that when gNB100 is capable of setting a wideband CBW but UE200 does not use the wideband CBW, the wideband CBW cannot be used for UE200 that does not support the wideband CBW (see Figure 8).

[0076] (5) Application Scenes In light of the above-mentioned existing technology, application scenarios according to the embodiment will be described below. In the application scenario, a case where 120 kHz SCS is used in FR2 will be illustrated as an example, similar to the above-mentioned existing technology. In such a case, a wideband CBW (wideband CC bandwidth) that can be set by the gNB100 is 400 MHz, a maximum CBW (maximum CC bandwidth) supported by the UE200 is 100 MHz, and the upper limit number of CCs supported by the UE200 in CA is 4 will be considered.

[0077] In such a case, when the gNB100 sets a wideband CBW wider than the maximum CBW supported by the UE 200, the UE 200 and the gNB 100 perform communication capable of using a second number of frequency resources that is greater than the first number of frequency resources available to the gNB 100 on the assumption that the UE 200 uses the wideband CBW. Hereinafter, the first number of frequency resources is referred to as a first number of available RBs, and the second number of frequency resources is referred to as a second number of available RBs.

[0078] Here, the maximum CBW supported by UE200 may be specified by an information element (e.g., supportedBandwidthDL) reported by UE200. The wideband CBW set by gNB100 may be set by an information element (e.g., SCS-SpecificCarrier) included in an RRC parameter (e.g., ServingCellConfig). A case in which gNB100 sets a wideband CBW wider than the maximum CBW supported by UE200 may be interpreted as a case in which gNB100 sets a number of PRBs greater than the maximum number of PRBs supported by UE200.

[0079] The first available number of RBs may be the number of RBs available under the assumption that UE 200 uses a wideband CBW as the CBW, or may be the number of RBs available under the assumption that UE 200 uses CA using a CC equivalent to the wideband CBW. The first available number of RBs may be considered to be the number of RBs determined by existing technology. The second available number of RBs may be considered to be the number of RBs newly introduced.

[0080] For example, in a case where a 120 kHz SCS is used in FR2, the first available RB number of a 400 MHz CBW is 264. In the embodiment, when the gNB 100 sets a 400 MHz CBW, a mechanism is introduced that allows a number of RBs greater than 264 to be available.

[0081] Specifically, as shown in Fig. 9, in a 400 MHz CBW (e.g., CC bandwidth of the gNB 100), a number of RBs greater than the existing value (264) may be available. Although details will be described later, a GB narrower than the existing GB may be introduced as the 400 MHz CBW, and a number of FFT points greater than the existing number of FFT points may be introduced.

[0082] Furthermore, in a 100 MHz CBW (maximum CC bandwidth of UE 200), it may be possible to use RBs that are greater than the existing value (64). Although details will be described later, a GB narrower than the existing GB may be introduced as a 100 MHz CBW, and a number of FFT points greater than the existing number of FFT points may be introduced.

[0083] (5.1) Number of available RBs Here, the second available RB number is the Transmission Bandwidth Configuration N RB Furthermore, a value larger than the existing value (e.g., 275) may be introduced as a value that can be set in a value (maxNrofPhysicalResourceBlocks) that can be taken in an information element (e.g., carrierBandwitdh included in SCS-SpecificCarrier) included in an RRC parameter (e.g., ServingCellConfig).

[0084] The configuration of introducing the second number of available RBs may be interpreted as a configuration in which a GB narrower than the existing GB is introduced as the GB of the wideband CBW. The existing GB may be a minimum guard band defined in 3GPP TS38.101 V17.0.0 or the like. The existing GB may be interpreted as a configuration in which a GB smaller than the sum of the GBs of the CCs equivalent to the wideband CBW (i.e., the GB of the CCs × the number of CCs) is introduced as the GB of the wideband CBW. In such a case, a new GB may be defined in association with the wideband CBW as a GB applied to a case in which the gNB100 sets a wideband CBW wider than the maximum CBW supported by the UE200. The new GB may be defined as a minimum guard band.

[0085] (5.2) Number of FFT points A new number of FFT points greater than the existing number of FFT points (4096) may be defined as the number of FFT points. The new number of FFT points may be 8192. In such a case, a CBW wider than the upper limit of the existing CBW may be set as the CBW associated with the SCS. For example, for an SCS of 15 kHz, a CBW (e.g., 100 MHz) greater than the upper limit of the existing CBW (e.g., 50 MHz) may be set. Furthermore, a value greater than the existing value (e.g., 275) may be introduced as a value that can be set for a value (maxNrofPhysicalResourceBlocks) that can be taken by an information element (e.g., carrierBandwitdh included in SCS-SpecificCarrier) included in an RRC parameter (e.g., ServingCellConfig).

[0086] (5.3) Allocation of bandwidth wider than maximum CBW A band wider than the maximum CBW supported by the UE 200 may be allocated within the wideband CBW. Specifically, when a wideband CBW wider than the maximum CBW supported by the UE 200 is set, the UE 200 and the gNB 100 may perform communication using two or more specific bandwidths set in the wideband CBW with the maximum CBW as the upper limit.

[0087] In such a case, a condition may be required that the SCS applied to each of the two or more specific bandwidths be the same. A condition may be required that the two or more specific bandwidths do not overlap.

[0088] Furthermore, a GB smaller than the existing GB may be introduced as the GB provided at both ends of the maximum CBW supported by the UE 200. In such a case, a new GB may be defined in association with the maximum CBW as the GB provided at both ends of the maximum CBW supported by the UE 200. The new GB may be defined as a minimum guard band.

[0089] Here, a specific bandwidth may be considered to be a BWP that can be simultaneously active within a wideband CBW. Two or more BWPs that can be simultaneously active within a wideband CBW may be considered to be a BWP group.

[0090] Alternatively, the specific bandwidth may be considered as an RB group in the frequency direction. The specific frequency band may be referred to as an RB set. A special BWP may be defined as a BWP in which two or more specific bandwidths can be set.

[0091] In this way, when two or more specific bandwidths are set in the wideband CBW, one or more options selected from the options shown below may be adopted.

[0092] (5.3.1) First option In the first option, one serving cell may allocate PDSCH resources to two or more specific bandwidths simultaneously. For example, one DCI may include an allocation information element that specifies a PDSCH resource to be allocated to each of two or more specific bandwidths. Alternatively, one DCI may include an allocation information element that specifies a PDSCH resource to be allocated to any one of two or more specific bandwidths, and the allocation information element included in the DCI may also be applied to the other specific bandwidths. Alternatively, two or more DCIs corresponding to two or more specific bandwidths may individually include an allocation information element that specifies a PDSCH resource to be allocated to each of two or more specific bandwidths.

[0093] (5.3.2) Second option In the second option, the FDRA field may be extended. For example, when a specific bandwidth is treated as a BWP group that can be simultaneously activated in a wideband CBW, the number of bits in the FDRA field for notifying resource allocation to two or more specific bandwidths (BWPs) may be extended. When a specific bandwidth is treated as an RB group in the frequency direction, resource allocation to one RB group may be notified by the FDRA field, and an information element (e.g., a bitmap of RB groups) indicating to which RB group the resource allocation is applied may be notified separately from the FDRA field.

[0094] (5.3.3) Third option In the third option, TB (Transport Block), HARQ process and HARQ feedback are considered. Specifically, the following mechanism may be adopted.

[0095] First, a different TB may be mapped to each of two or more specific bandwidths, and a different HARQ process may be configured for each of the two or more specific bandwidths.

[0096] Secondly, a TB may be mapped across two or more specific bandwidths, and one HARQ process may be configured for the two or more specific bandwidths.

[0097] Thirdly, HARQ feedback may be performed separately for each of two or more specific bandwidths using a Code Block Group (CBG) mechanism.

[0098] (5.3.4) Fourth Option The fourth option considers the UL BWP. Specifically, the following mechanisms may be adopted:

[0099] First, in the TDD band, the center of the UL BWP only needs to be aligned with the center of any one of the specific frequency bands set within the wideband CBW.

[0100] Secondly, a specific frequency band that does not overlap with the UL BWP may be assumed to always be available for DL ​​communication, or only time resources available for DL ​​communication in a specific frequency band that overlaps with the UL BWP may be assumed to be available for DL ​​communication as well. Whether the former assumption is possible may be reported as a terminal capability.

[0101] (5.3.5) Fifth Option In the fifth option, PDCCH (CORESET) is considered. Specifically, the following mechanism may be adopted.

[0102] First, the PDCCH(CORESET) may be assumed to be mapped to one specific frequency band (Case 1).

[0103] Secondly, it may be assumed that the PDCCH(CORESET) can be mapped to each of two or more specific frequency bands (Case 2).

[0104] Thirdly, it may be assumed that the PDCCH (CORESET) can be mapped across two or more specific frequency bands (Case 3).

[0105] Fourth, new values ​​different from the existing values ​​may be introduced for the upper limit of the number of Control Channel Elements (CCEs) and the number of Blind Decodings (BDs). When Case 2 and Case 3 are applied, new values ​​may be introduced for the upper limit of the number of CCEs and the number of BDs.

[0106] (5.3.6) Option 6 The sixth option considers CSI-RS and CSI reporting. Specifically, the following mechanisms may be adopted:

[0107] First, the CSI-RS may be assumed to be mapped to one specific frequency band (Case 1).

[0108] Second, it may be assumed that the CSI-RS can be mapped to each of two or more specific frequency bands (Case 2).

[0109] Third, it may be assumed that the CSI-RS can be mapped across two or more specific frequency bands (Case 3).

[0110] Fourth, the unit of CSI reporting may be different for each of the above cases. For example, in case 1 and case 2, individual CSI reporting may be performed for each specific frequency band, and in case 3, CSI reporting may be performed for two or more specific frequency bands.

[0111] Fourth, the use of the CSI-RS may be different for each of the above cases. Examples of the use of the CSI-RS include CSI-Acquisition, Beam management, Tracking of the UE 200, and Mobility of the UE 200.

[0112] (5.4) Applicability Conditions An application condition for setting two or more specific frequency bands in the wideband CBW may be determined. The application condition may include conditions such as a frequency band, a band, a duplex mode, and a serving cell type in which the two or more specific frequency bands can be set. The application condition may be determined in advance by the wireless communication system 10.

[0113] (5.5) UE Capability A UE Capability may be defined that indicates whether the UE 200 supports two or more specific frequency bands set in the wideband CBW, either implicitly or explicitly. For example, whether the UE 200 supports two or more specific frequency bands set in the wideband CBW may be implicitly indicated by a terminal type 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 two or more specific frequency bands set in the wideband CBW may be implicitly indicated by other information elements included in the UE Capability.

[0114] Furthermore, on the premise that UE 200 supports CA, two or more specific frequency bands may be set in the wideband CBW. The upper limit of the number of specific frequency bands set in the wideband CBW may be determined based on the upper limit of the number of CCs that can be used for CA. For example, the upper limit of the number of specific frequency bands may be the same as the upper limit of the number of CCs that can be used for CA.

[0115] (6) Actions and Effects In the embodiment, the UE 200 and the gNB 100 perform communication that can utilize a second number of frequency resources that is greater than the first number of frequency resources that the gNB 100 can utilize on the assumption that the terminal utilizes the wideband CC bandwidth when the gNB 100 sets a wideband CC bandwidth (CBW) that is greater than the maximum CC bandwidth (maximum CBW) supported by the UE 200. According to such a configuration, when assuming a case in which the gNB 100 sets a CBW that is greater than the maximum CBW supported by the UE 200, the second number of frequency resources that is greater than the first number of frequency resources (the number of existing RBs) can be utilized, thereby improving frequency utilization efficiency.

[0116] (7) Other embodiments The present invention has been described above in accordance with the embodiments, but the present invention is not limited to these descriptions, and it will be obvious to those skilled in the art that various modifications and improvements are possible.

[0117] The block diagrams (FIGS. 4 and 5) used in the description of the above-mentioned embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (e.g., by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0118] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of each of these.

[0119] Furthermore, the above-mentioned gNB100 and UE200 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 10 is a diagram showing an example of a hardware configuration of the device. As shown in Fig. 10, 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, and a bus 1007.

[0120] In the following description, the term "apparatus" may 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.

[0121] 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.

[0122] In addition, each function in the device is realized by loading a specific software (program) onto hardware such as the processor 1001, memory 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and storage 1003.

[0123] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0124] Furthermore, the processor 1001 reads out 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 according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned 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. The programs may be transmitted from a network via a telecommunications line.

[0125] 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 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0126] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, 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 (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may 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.

[0127] The communication device 1004 is hardware (transmission / reception device) for performing communication 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.

[0128] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0129] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0130] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0131] 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 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.

[0132] 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 of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0133] 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, 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. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0134] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0135] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0136] Information and signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0137] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0138] The determination may be based on a value represented by a single bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0139] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

[0140] 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.

[0141] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the 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, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0142] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the 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.

[0143] In addition, the terms described in this disclosure and the 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.

[0144] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0145] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0146] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas 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 limiting in any way.

[0147] 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0148] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0149] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0150] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0151] 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.

[0152] At least one of the base station and the mobile station may be called 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 moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (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 include a device that does not necessarily move during communication operation. 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.

[0153] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment 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 communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0154] 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.

[0155] A radio frame may be composed of one or more frames in the time domain, each of which may be called a subframe.

[0156] A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0157] Numerology may be a communication parameter that applies 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 that a transceiver performs in the frequency domain, a particular windowing operation that a transceiver performs in the time domain, etc.

[0158] 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 time unit based on numerology.

[0159] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed 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.

[0160] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0161] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit expressing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0162] 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 frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0163] 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) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0164] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0165] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0166] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 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.

[0167] 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 the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0168] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0169] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0170] 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.

[0171] 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 numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0172] 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.

[0173] 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 replaced with "BWP".

[0174] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0175] 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 at least one of one or more wires, cables, and 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.

[0176] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0177] 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."

[0178] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0179] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure 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.

[0180] 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." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0181] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0182] 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, search, inquiry (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 a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0183] 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."

[0184] 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 in the present disclosure. 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. [Explanation of symbols]

[0185] 10. Wireless communication systems 20 NG-RAN 100 gNB 110 Receiving unit 120 Transmitter 130 Control section 200UE 210 Radio signal transmitter / receiver 220 Amplifier section 230 Modulation and demodulation section 240 Control signal / reference signal processing unit 250 Encoding / Decoding Unit 260 Data transmission and reception unit 270 Control Unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. A receiving unit that receives information for setting a wideband carrier bandwidth that is wider than a maximum carrier bandwidth supported by the terminal from a base station; a control unit that executes communication using frequency resources allocated within the wideband carrier bandwidth with the maximum carrier bandwidth as an upper limit; The wideband carrier bandwidth has a second number of frequency resources that is greater than a first number of frequency resources that the base station can allocate assuming that the wideband carrier bandwidth is used by the terminal.

2. The control unit executes communication using two or more specific bandwidths set within the wideband carrier bandwidth, The terminal according to claim 1 , wherein each of the two or more specific bandwidths is set with the maximum carrier bandwidth as an upper limit.

3. The terminal according to claim 2 , wherein the guard bands provided at both ends of each of the two or more specific bandwidths are narrower than an existing guard band.

4. The control unit executes communication using two or more specific bandwidths that are set in the wideband carrier bandwidth with a maximum carrier bandwidth as an upper limit, The terminal of claim 1 , wherein the subcarrier spacing applied to each of the two or more specific bandwidths is the same.

5. A transmission unit that transmits information to the terminal that sets a wideband carrier bandwidth wider than a maximum carrier bandwidth supported by the terminal; a control unit that executes communication using frequency resources allocated within the wideband carrier bandwidth with the maximum carrier bandwidth as an upper limit; A base station, wherein the wideband carrier bandwidth has a second number of frequency resources that is greater than a first number of frequency resources that the base station can allocate on the assumption that the terminal uses the wideband carrier bandwidth.

6. A terminal and a base station, The base station transmits to the terminal a wideband carrier bandwidth that is wider than a maximum carrier bandwidth supported by the terminal; The terminal receives information for setting the wideband carrier bandwidth from the base station; The terminal and the base station perform communication using frequency resources allocated within the wideband carrier bandwidth up to the maximum carrier bandwidth, A wireless communication system, wherein the wideband carrier bandwidth has a second number of frequency resources that is greater than a first number of frequency resources that the base station can allocate on the assumption that the terminal uses the wideband carrier bandwidth.

7. receiving information from a base station for setting a wideband carrier bandwidth that is wider than a maximum carrier bandwidth supported by the terminal; performing communication using frequency resources allocated within the wideband carrier bandwidth up to the maximum carrier bandwidth; The wireless communication method, wherein the wideband carrier bandwidth has a second number of frequency resources that is greater than a first number of frequency resources that the base station can allocate on the assumption that the terminal uses the wideband carrier bandwidth.

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