Terminal, base station, communication system and communication method

Abstract

A terminal comprises: a receiving unit for receiving system information; and a control unit for using the maximum bandwidth of an initial bandwidth part (i.e., BWP) and a maximum supported bandwidth when the channel bandwidth indicated by the system information received by the receiving unit is not supported.

Description

Technical Field

[0001] The present invention relates to a terminal, a base station and a communication method in a wireless communication system. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is advancing research on wireless communication methods known as NR (New Radio) or 5G to achieve further increases in system capacity, higher data transmission speeds, and lower latency within wireless networks. NR is exploring various wireless technologies to meet the requirements of achieving throughput exceeding 10 Gbps while keeping latency within wireless networks below 1 ms.

[0003] Currently, in 3GPP meetings, discussions are underway on how terminals (user devices) should utilize the bandwidth of channels broadcast in SIB1.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-Patent Document 1: 3GPP TSG-RAN WG2 Meeting #106, R2-1908301, Reno, USA, May 13-17, 2019

[0007] Non-Patent Document 2: 3GPP TS 38.101-1 V15.5.0 (March 2019)

[0008] Non-Patent Document 3: 3GPP TS38.331 V15.5.1 (April 2019)

[0009] Non-Patent Document 4: 3GPP TS38.213 V15.5.0 (March 2019) Summary of the Invention

[0010] Problems to be solved by the invention

[0011] When the terminal does not support the carrier bandwidth reported in SIB1, it is necessary to clearly define the frequency bandwidth used by the terminal for communication until the actually supported channel bandwidth is set.

[0012] Means for solving problems

[0013] According to one embodiment of the present invention, a terminal is provided, comprising: a receiving unit for receiving system information; and a control unit for setting the bandwidth of an initial bandwidth part (BWP) and a maximum bandwidth among supported maximum bandwidths when the channel bandwidth indicated by the system information received by the receiving unit is not supported.

[0014] Effects of the Invention

[0015] According to the embodiment, when the terminal does not support the carrier bandwidth notified in SIB1, a method is provided for explicitly specifying the frequency bandwidth used for communication by the terminal until the actually supported channel bandwidth is set. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the communication system in this embodiment.

[0017] Figure 2 This is a diagram showing an example of a main information block.

[0018] Figure 3 This is a diagram showing an example of information that can be set for a terminal through controlResourceSetZero.

[0019] Figure 4 This is a diagram showing an example of a change in the specification of the SCS-SpecificCarrier information element.

[0020] Figure 5 This is a diagram showing an example of the functional structure of a terminal.

[0021] Figure 6 This is a diagram showing an example of the functional structure of a base station.

[0022] Figure 7 This is a diagram showing an example of the hardware configuration of a terminal and a base station. DETAILED DESCRIPTION

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that the embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0024] In addition, in the implementation method described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), and PRACH (Physical random access channel) used in existing LTE are used. For the convenience of recording, other names may also be used to refer to the same signals and functions. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. Among them, even the signals used in NR are not necessarily explicitly recorded as "NR-".

[0025] Furthermore, in the embodiments of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or other modes (such as Flexible Duplex, etc.).

[0026] Furthermore, in the embodiments of the present invention, “configuring” wireless parameters and the like may refer to pre-configuring predetermined values or configuring wireless parameters notified from the base station apparatus 10 or the user apparatus 20 .

[0027] Figure 1 FIG is a diagram for explaining a wireless communication system in an embodiment of the present invention. Figure 1 As shown in FIG, a base station 10 and a terminal 20 are included. Figure 1 In the figure, one base station 10 and one terminal 20 are shown, but these are examples, and a plurality of each may be provided.

[0028] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined by the time domain and the frequency domain. The time domain can also be defined by the number of OFDM code elements, and the frequency domain can also be defined by the number of subcarriers or the number of resource blocks. The base station 10 sends the synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. A part of the system information is sent in NR-PBCH, which is also called broadcast information. The synchronization signal and the broadcast information can also be periodically sent as an SS block (SS / PBCH block) composed of a specific number of OFDM code elements. For example, the base station 10 also sends a control signal or data to the terminal 20 in DL (Downlink) and receives a control signal or data from the terminal 20 in UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to send and receive signals. For example, as Figure 1 As shown, the reference signal sent from the base station 10 includes CSI-RS (Channel State Information Reference Signal), and the channel sent from the base station 10 includes PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel).

[0029] The user device 20 is a communication device with wireless communication functions, such as a smartphone, mobile phone, tablet computer, wearable terminal, M2M (Machine-to-Machine) communication module, etc. The terminal 20 may also be referred to as a user equipment (UE) 20. The terminal 20 receives control signals or data from the base station 10 in the DL and sends control signals or data to the base station 10 in the UL, thereby utilizing various communication services provided by the wireless communication system. For example, Figure 1 As shown, the channels transmitted from the terminal 20 include a PUCCH (Physical Uplink Control Channel) and a PUSCH (Physical Uplink Shared Channel).

[0030] (PDCCH-ConfigSIB1 in Release 15 NR)

[0031] PDCCH-ConfigSIB1 in Release 15 NR is an information element (IE) contained in the Master Information Block (MIB).

[0032] like Figure 2 As shown, PDCCH-ConfigSIB1 includes two IEs: controlResourceSetZero and searchSpaceZero. Each of controlResourceSetZero and searchSpaceZero is a 4-bit parameter for notifying an integer value within the range of 0 to 15.

[0033] During cell search, if the terminal 20 determines that the control resource set (CORESET) of the Type0-PDCCH common search space (CSS) is based on the MIB, the number of resource blocks and the number of symbols of the CORESET are derived based on the 4 most significant bits (MSBs) of the PDCCH-ConfigSIB1. Here, the 4 MSBs of the PDCCH-ConfigSIB1 correspond to controlResourceSetZero. Furthermore, the terminal 20 derives the PDCCH monitoring opportunity based on the 4 least significant bits (LSBs) of the PDCCH-ConfigSIB1. Here, the 4 LSBs of the PDCCH-ConfigSIB1 correspond to searchSpaceZero.

[0034] (controlResourceSetZero,CORESET#0)

[0035] Figure 3 This is a diagram showing an example of the content of information that can be set to the terminal 20 by controlResourceSetZero (Non-Patent Document 3). For example, when a subcarrier spacing of 30 kHz and a minimum channel bandwidth of 40 MHz are applied, the terminal 20 Figure 3 The table shown in the following table explains the 4 bits of controlResourceSetZero. The 4-bit value is the same as Figure 3 The index of the table corresponds to the value of the index, which takes any integer value in the range of 0 to 15. The terminal 20 is based on the value of the notified index, such as Figure 3 As shown in the table, the multiplexing mode of the SS / PBCH block (also called SS / PBCH block, SS block, or SSB) and the control resource set (CORESET), the number of resource blocks (RBs) of the CORESET, the number of codewords of the CORESET, and the resource block level offset between the SS / PBCH block and the CORESET are set.

[0036] Currently, in 3GPP meetings, discussions are underway on how the terminal 20 (user apparatus) utilizes the channel bandwidth reported in the system information block 1 (SIB1).

[0037] In the case where the terminal 20 does not support the channel bandwidth notified in SIB1, in the current mechanism, it is assumed that after the RRC connection is established between the terminal 20 and the base station 10, the base station 10 detects the UE capability sent from the terminal 20, and based on the UE capability, the base station 10 separately signals the terminal 20 via an RRC reset message (Radio Resource Control (RRC) Reconfiguration message) to notify the terminal 20 of the channel bandwidth actually supported by the terminal 20.

[0038] However, it is not clear how to set the channel bandwidth used for uplink signal transmission from terminal 20 when establishing the RRC connection between terminal 20 and base station 10 before base station 10 detects the UE capability of terminal 20 and sends the RRC reset message, and the channel bandwidth used when terminal 20 sends the UE capability.

[0039] SIB1 includes an information element called SCS-SpecificCarrier. SCS-SpecificCarrier is a parameter used to determine carrier information for a specific parameter set (subcarrier spacing (SCS)) for the initial bandwidth portion. SCS-SpecificCarrier also includes an information element called carrierBandwidth. This information element specifies the channel bandwidth commonly used by terminals 20.

[0040] Here, in the case where the terminal 20 does not support the carrier bandwidth notified in SIB1, in order to clearly define the uplink bandwidth and downlink bandwidth used for communication by the terminal 20 from the time the carrier bandwidth is notified in the SIB1 until the base station 10 sets the channel bandwidth actually supported by the terminal 20 to the terminal 20 using dedicated signaling based on the UE capability received from the terminal 20, it is proposed to change the carrierBandwidth information element to, for example Figure 4 The content shown.

[0041] Figure 4 This is a diagram showing an example of a change in the specification of the SCS-SpecificCarrier information element. Figure 4In the example, the definition of the carrierBandwidth information element included in the SCS-SpecificCarrier information element is changed.

[0042] according to Figure 4 As shown in the definition of the carrierBandwidth information element in the example of , regarding the frequency band and subcarrier spacing within a cell, if the terminal 20 does not support the DL channel bandwidth specified by the carrierBandwidth field in the DownlinkConfigCommon / DownlinkConfigCommonSIB, the terminal 20 may apply the DL channel bandwidth derived by condition X until the reception of RRCSetup / RRCResume / RRCReestablishment. Furthermore, regarding the frequency band and subcarrier spacing within a cell, if the terminal 20 does not support the UL channel bandwidth specified by the carrierBandwidth field in the UplinkConfigCommon / UplinkConfigCommonSIB, the terminal 20 may apply the UL channel bandwidth derived by condition X until the reception of RRCSetup / RRCResume / RRCReestablishment.

[0043] Specifically, at least the following 12 conditions, Alt. 1 to Alt. 12, are considered as the condition X.

[0044] (Alt.1)

[0045] When the terminal 20 cannot support the carrier bandwidth reported in SIB1, the terminal 20 may set the uplink frequency bandwidth and / or downlink frequency bandwidth used for communication by the terminal 20 to the bandwidth (BW) of CORESET#0.

[0046] (Alt.2)

[0047] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the maximum channel bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0048] (Alt.3)

[0049] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink frequency bandwidth and / or downlink frequency bandwidth used for communication by the terminal 20 may be set to the minimum channel bandwidth supported by the terminal 20. For example, the minimum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0050] (Alt.4)

[0051] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the minimum bandwidth between the bandwidth of CORESET#0 and the minimum bandwidth supported by the terminal 20 (i.e., MIN{CORESET#0BW, minimum channel BW supported by the UE}). For example, the minimum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0052] (Alt.5)

[0053] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the minimum bandwidth (i.e., MIN{CORESET#0BW, maximum channel BW supported by UE}) between the bandwidth of CORESET#0 and the maximum bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0054] (Alt.6)

[0055] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth (i.e., MAX{CORESET#0BW, maximum channel BW supported by UE}) between the bandwidth of CORESET#0 and the maximum bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0056] (Alt.7)

[0057] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth (i.e., MAX{CORESET#0BW, minimum channel BW supported by UE}) between the bandwidth of CORESET#0 and the minimum bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0058] (Alt.8)

[0059] When the terminal 20 cannot support the carrier bandwidth reported in SIB1, the frequency bandwidth assumed by the terminal 20 may be specifically defined in the specification for each frequency band.

[0060] (Alt.9)

[0061] When the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the bandwidth of CORESET#0, the maximum bandwidth supported by the terminal 20, and the minimum bandwidth among the bandwidths envisioned by the terminal 20 for the frequency band specifically specified in the specification (i.e., MIN{CORESET#0BW, the maximum channel BW supported by the UE, the bandwidth envisioned by the terminal 20 for the frequency band specifically specified in the specification}).

[0062] (Alt.10)

[0063] When the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the bandwidth of CORESET#0, the minimum bandwidth supported by the terminal 20, and the minimum bandwidth envisioned by the terminal 20 for the frequency band specifically specified in the specification (i.e., MIN{CORESET#0BW, the minimum channel BW supported by the UE, the frequency band envisioned by the terminal 20 for the frequency band specifically specified in the specification}).

[0064] (Alt.11)

[0065] If the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be used for the bandwidth of CORESET#0, the maximum bandwidth supported by the terminal 20, and the maximum bandwidth among the bandwidths envisioned by the terminal 20 specifically specified in the specification for the frequency band (i.e., MAX{CORESET#0BW, the maximum channel BW supported by the UE, the bandwidth envisioned by the terminal 20 specifically specified in the specification for the frequency band}).

[0066] (Alt.12)

[0067] When the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the bandwidth of CORESET#0, the minimum bandwidth supported by the terminal 20, and the maximum bandwidth among the bandwidths envisioned by the terminal 20 for the frequency band specifically specified in the specification (i.e., MAX{CORESET#0BW, the minimum channel BW supported by the UE, the bandwidth envisioned by the terminal 20 for the frequency band specifically specified in the specification}).

[0068] (Alt.13)

[0069] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth and / or downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth between the bandwidth of the initial bandwidth part (BWP) and the maximum bandwidth supported by the terminal 20 (i.e., MAX{initial BWP BW, maximum channel BW supported by the UE}). For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification. It should be noted that, here, either the initial downlink BWP or the initial uplink BWP may be used as the initial BWP.

[0070] (Alt.14)

[0071] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth between the bandwidth of the initial downlink BWP and the maximum bandwidth supported by the terminal 20 (i.e., MAX{initial downlink BWP BW, maximum channel BW supported by the UE}). For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0072] (Alt.15)

[0073] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth (i.e., MAX{initial uplink BWP BW, maximum channel BW supported by the UE}) between the bandwidth of the initial uplink BWP and the maximum bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0074] (Alt.16)

[0075] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth between the bandwidth of the initial downlink BWP and the maximum bandwidth supported by the terminal 20 (i.e., MAX{initial downlink BWP BW, maximum channel BW supported by the UE}). For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0076] (Alt.17)

[0077] If the terminal 20 cannot support the carrier bandwidth notified in SIB1, the uplink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth (i.e., MAX{initial uplink BWP BW, maximum channel BW supported by the UE}) between the bandwidth of the initial uplink BWP and the maximum bandwidth supported by the terminal 20. For example, the maximum channel bandwidth supported by the terminal 20 may also be specified by the specification.

[0078] It should be noted that in Alt. 13 to Alt. 17 above, the initial BWP may be replaced by the initial uplink BWP. Alternatively, the initial BWP may be replaced by the initial downlink BWP. Alternatively or additionally, the initial uplink BWP and the initial downlink BWP may be collectively referred to as the initial BWP.

[0079] According to Alt.1 to Alt.17 above, in the case where the terminal 20 does not support the carrier bandwidth broadcast in SIB1, it is possible to clearly stipulate the uplink frequency bandwidth and the downlink frequency bandwidth used for communication by the terminal 20 during the period from the time when the carrier bandwidth is notified in the SIB1 until the base station 10 sets the channel bandwidth actually supported by the terminal 20 to the terminal 20 using dedicated signaling based on the UE capability received from the terminal 20.

[0080] (Variation)

[0081] If the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink frequency bandwidth used for communication by the terminal 20 may be set to any one of the frequency bandwidths Alt.1 to Alt.12, Alt.13, Alt.16 and Alt.17, and the downlink frequency bandwidth used for communication by the terminal 20 may be set to any one of the frequency bandwidths Alt.1 to Alt.12, Alt.13, Alt.14 and Alt.15 except the frequency bandwidth set as the uplink frequency bandwidth.

[0082] For example, when the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth used for communication by the terminal 20 may be set to the minimum bandwidth between the bandwidth of CORESET#0 and the minimum bandwidth supported by the terminal 20 (i.e., MIN{CORESET#0BW, minimum channel BW supported by UE}), and the downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth between the bandwidth of CORESET#0 and the maximum bandwidth supported by the terminal 20 (i.e., MAX{CORESET#0BW, maximum channel BW supported by UE}).

[0083] For example, when the terminal 20 is unable to support the carrier bandwidth notified in SIB1, the uplink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth among the bandwidth of the initial uplink BWP and the maximum bandwidth supported by the terminal 20 (i.e., MAX{initial uplink BWP BW, maximum channel BW supported by UE}), and the downlink bandwidth used for communication by the terminal 20 may be set to the maximum bandwidth among the bandwidth of the initial downlink BWP and the maximum bandwidth supported by the terminal 20 (i.e., MAX{initial downlink BWP BW, maximum channel BW supported by UE}).

[0084] (Supplementary explanation for the initial BWP)

[0085] It should be noted that the aforementioned initial BWP may also be defined, for example, as follows.

[0086] For the terminal 20, when the initialDownlinkBWP is not set as an information element, the initial DLBWP can also be defined by the position and number of consecutive (adjacent) PRBs among multiple physical resource blocks (PRBs) in the Type0-PDCCH CSS (Common Search Space) set, and the subcarrier spacing (SCS) and cyclic prefix of the PDCCH reception in the Type0-PDCCH CSS set. Here, the consecutive PRBs can also be multiple PRBs between the PRB with the smallest index and the PRB with the largest index (including the PRB with the smallest index and the PRB with the largest index) among multiple PRBs in the CORESET of the Type0-PDCCH CSS set.

[0087] For the terminal 20, if the initial DownlinkBWP is not set, the initial DL BWP can be set using the information element initialDownlinkBWP. For operations in the primary cell or the secondary cell, the terminal 20 can also set the initial UL BWP using the information element initialUplinkBWP.

[0088] When the secondary UL carrier is configured for the terminal 20 , the initial UL BWP in the secondary UL carrier may be configured for the terminal 20 using the initialUplinkBWP information element.

[0089] The initialDownlinkBWP information element may also be, for example, the configuration of the initial downlink BWP for the SpCell (MCG or PCell of SCG) and SCell. The network may also configure the locationAndBandwidth information element (the frequency domain location and bandwidth of the bandwidth component) so that the initial downlink BWP includes the entire CORESET#0 of the serving cell in the frequency domain. In this case, the terminal 20 may apply locationAndBandwidth only after receiving RRCSetup / RRCResume / RRCReestablishment.

[0090] Additionally or alternatively, the initialDownlinkBWP, as an information element, may also be a dedicated (UE-specific) configuration, such as the initial downlink bandwidth portion (i.e., DL BWP#0). In this initialDownlinkBWP, if an optional information element is set, the terminal 20 may also set the BWP configured in RRC to BWP#0 (based on UE capabilities). In this initialDownlinkBWP, if no optional information element is set, the terminal 20 may not assume that the BWP configured in RRC is BWP#0 (based on UE capabilities). When no BWP is configured in addition to the initialDownlinkBWP, the network often configures the initialDownlinkBWP. In the absence of a dedicated portion of the initial UL / DL BWP configuration, the initial BWP can be used, but this is accompanied by several limitations. For example, since DCI format 1_0 cannot be applied to DCI-based BWP switching, RRC reconfiguration is required to switch to another BWP.

[0091] The initialDownlinkBWP as an information element may also be the setting of the initial uplink BWP of the SpCell (PCell of the MCG or SCG), for example.

[0092] The initialUplinkBWP, as an information element, can also be a dedicated (UE-specific) setting, for example, of the initial uplink bandwidth part (i.e., UL BWP#0). In this initialUplinkBWP, if the optional information element is set, the terminal 20 can also set the BWP set in RRC to BWP#0 (from the perspective of UE capabilities). In this initialUplinkBWP, if the optional information element is not set, the terminal 20 will not assume that the BWP set in RRC is BWP#0 (from the perspective of UE capabilities). When no BWP is set in addition to the initialUplinkBWP, the network often sets the initialUplinkBWP. In the absence of a dedicated part of the initial UL / DL BWP setting, the initial BWP can be used, but it comes with several restrictions. For example, since DCI format 1_0 cannot be applied to the switching of DCI-based BWP, RRC Reconfiguration is required to switch to another BWP.

[0093] (Device Structure)

[0094] Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processing and operations described so far. The base station 10 and terminal 20 have all the functions described in this embodiment. However, the base station 10 and terminal 20 may also have only a portion of the functions described in this embodiment.

[0095] Base Station 10

[0096] Figure 5 FIG1 is a diagram showing an example 10 of the functional structure of a base station. Figure 5 As shown, the base station 10 includes a transmitting unit 110, a receiving unit 120, and a control unit 130. Figure 5 The functional configuration shown in FIG. 1 is merely an example. As long as the operations according to the present embodiment can be performed, the functional divisions and the names of the functional units may be arbitrary.

[0097] Transmitter 110 creates a transmission signal based on transmission data and wirelessly transmits the signal. Receiver 120 wirelessly receives various signals and obtains higher-level layer signals from received physical layer signals. Receiver 120 also includes a measurement unit that measures received signals to obtain, for example, received power.

[0098] The control unit 130 controls the base station 10. It should be noted that the functions of the control unit 130 related to transmission may be included in the transmitting unit 110, and the functions of the control unit 130 related to reception may be included in the receiving unit 120.

[0099] In base station 10, control unit 130 sets controlResourceSetZero in the information element included in the MIB, namely, PDCCH-ConfigSIB1, and transmitting unit 110 transmits this MIB to terminal 20. Furthermore, in base station 10, control unit 130 sets the channel bandwidth commonly used by terminal 20 in the carrierBandwidth information element in the SCS-SpecificCarrier information element included in SIB1, and transmitting unit 110 transmits SIB1 including this carrierBandwidth information element to terminal 20.

[0100] In addition, in the base station 10, the control unit 130 sets the following in the carrierBandwidth information element in the SCS-SpecificCarrier information element included in SIB1: regarding the frequency band and subcarrier spacing within the cell, when the terminal 20 does not support the DL channel bandwidth specified by the carrierBandwidth field in the DownlinkConfigCommon / DownlinkConfigCommonSIB, the terminal 20 applies the DL channel bandwidth derived by condition X during the period until the reception of RRCSetup / RRCResume / RRCReestablishment, and regarding the frequency band and subcarrier spacing within the cell, when the terminal 20 does not support the UL channel bandwidth specified by the carrierBandwidth field in the UplinkConfigCommon / UplinkConfigCommonSIB, the terminal 20 applies the UL channel bandwidth derived by condition X during the period until the reception of RRCSetup / RRCResume / RRCReestablishment; the sending unit 110 may also send the SIB1 containing the carrierBandwidth information element to the terminal 20.

[0101] Terminal 20

[0102] Figure 6 FIG is a diagram showing an example of the functional structure of a terminal. Figure 6 As shown in FIG. 2 , the terminal 20 includes a transmitting unit 210, a receiving unit 220, and a control unit 230. Figure 6 The functional configuration shown in FIG. 1 is merely an example. As long as the operations according to the present embodiment can be performed, the functional divisions and the names of the functional units may be arbitrary.

[0103] Transmitter 210 includes the function of generating a signal to be transmitted to base station 10 and wirelessly transmitting the signal. Receiver 220 includes the function of receiving various signals transmitted from base station 10 and acquiring, for example, higher-level layer information from the received signals. Receiver 220 also includes a measuring unit that measures received signals and acquires received power, etc.

[0104] The control unit 230 controls the terminal 20. It should be noted that the functions of the control unit 230 related to transmission may be included in the transmission unit 210, and the functions of the control unit 230 related to reception may be included in the reception unit 220.

[0105] For example, in the terminal 20 , the receiving unit 220 receives the MIB by receiving the SS / PBCH block, and the control unit 230 sets controlResourceSetZero and searchSpaceZero based on PDCCH-ConfigSIB1 included in the MIB.

[0106] Furthermore, in terminal 20, receiving unit 220 monitors the PDCCH and receives SIB1 based on the settings of controlResourceSetZero and searchSpaceZero set by control unit 230. Furthermore, in terminal 20, if control unit 230 detects that the channel bandwidth notified in SIB1 is not supported, control unit 230 may apply the DL channel bandwidth derived from condition X described above and / or the UL channel bandwidth derived from condition X described above until reception of RRCSetup / RRCResume / RRCReestablishment.

[0107] <Hardware Structure>

[0108] The block diagram used in the description of the above embodiment ( Figures 5 and 6 ) shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by using one device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired, wireless, etc.) and using the multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software. Among the functions, there are judgment, determination, judgment, calculation, calculation, processing, export, investigation, retrieval, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, anticipation, expectation, consideration, broadcasting, notification, communication, forwarding, configuration, reconstruction, allocation (allocating, mapping), assignment, etc., but are not limited to these. For example, a functional block (structural unit) that performs a transmission function may also be referred to as a transmitting unit or a transmitter, etc. As described above, the implementation method is not particularly limited.

[0109] For example, the base station 10 and the terminal 20 according to one embodiment of the present invention may both function as computers that perform the processing according to this embodiment. Figure 7 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0110] It should be noted that in the following description, the term "device" can be replaced by circuit, equipment, unit, etc. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or more of the devices shown in Figures 1001 to 1006, or to exclude some of the devices.

[0111] The various functions in the base station 10 and the terminal 20 are achieved, for example, by reading specific software (programs) into hardware such as the processor 1001 and the storage device 1002, and the processor 1001 performs operations to control communication via the communication device 1004, or control at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0112] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, registers, and the like.

[0113] In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a portion of the operations described in the above-mentioned embodiment is used. For example, the control unit 30 of the base station 10 can also be implemented by a control program that is stored in the storage device 1002 and operates in the processor 1001, and the same can be achieved for other functional blocks. The above-mentioned various processing descriptions are performed by one processor 1001, but can also be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented by one or more chips. It should be noted that the program can also be sent by the network via an electrical communication line.

[0114] The storage device 1002 may also be a computer-readable recording medium, and may be composed of at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), or a RAM (Random Access Memory). The storage device 1002 may also be referred to as a register, a cache, or a main memory (primary storage device). The storage device 1002 may store executable programs (program code), software modules, and the like for implementing the wireless communication method according to one embodiment of the present disclosure.

[0115] The auxiliary storage device 1003 may also be a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (such as a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (such as a card, a stick, or a key drive), a floppy disk, a magnetic stripe, and the like. The auxiliary storage device 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may also be other appropriate media, such as a database or a server that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0116] Communication device 1004 is hardware (a transmitting and receiving device) used to communicate between computers via at least one of a wired network and a wireless network. It is also referred to as, for example, a network device, a network controller, a network card, or a communication module. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), communication device 1004 may include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like.

[0117] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0118] Furthermore, the processor 1001, the storage device 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be composed of a single bus or may be composed of different buses between the devices.

[0119] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and may implement some or all of the functional blocks using this hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0120] (Summary of Implementation Methods)

[0121] This specification discloses at least the following terminal, base station, and communication method.

[0122] A terminal comprises: a receiving unit for receiving system information; and a control unit for responding to detection that a channel bandwidth included in the system information received by the receiving unit is not supported, wherein after the receiving unit receives the system information and until the receiving unit receives setting information of the supported channel bandwidth, the maximum bandwidth among the bandwidth of the initial bandwidth part (BWP) and the maximum bandwidth supported is set as the frequency bandwidth used for communication.

[0123] According to the above structure, in the case where the terminal does not support the carrier bandwidth notified in SIB1, it is possible to clearly stipulate the frequency bandwidth used for communication by the terminal from the time the carrier bandwidth is notified in the SIB1 until the base station sets the channel bandwidth actually supported by the terminal to the terminal using dedicated signaling based on the UE capabilities received from the terminal.

[0124] The control unit may also apply the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths, or the bandwidth of the initial uplink BWP and the maximum bandwidth among the supported maximum bandwidths as the bandwidth for downlink communication during the period from when the receiving unit receives the system information to when the setting information of the supported channel bandwidth is received.

[0125] According to the above structure, in the case where the terminal does not support the carrier bandwidth notified in SIB1, it is possible to clearly stipulate the frequency bandwidth used for downlink communication of the terminal from the time the carrier bandwidth is notified in the SIB1 until the base station sets the channel bandwidth actually supported by the terminal to the terminal using dedicated signaling based on the UE capabilities received from the terminal.

[0126] The control unit may also apply the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths, or the bandwidth of the initial uplink BWP and the maximum bandwidth among the supported maximum bandwidths, as the bandwidth for uplink communication during the period from when the receiving unit receives the system information to when the setting information of the supported channel bandwidth is received.

[0127] According to the above structure, in the case where the terminal does not support the carrier bandwidth notified in SIB1, it is possible to clearly stipulate the frequency bandwidth used for uplink communication of the terminal from the time the carrier bandwidth is notified in the SIB1 until the base station sets the channel bandwidth actually supported by the terminal to the terminal using dedicated signaling based on the UE capabilities received from the terminal.

[0128] The control unit may also apply the bandwidth of the initial uplink BWP and the maximum bandwidth among the supported maximum bandwidths as the bandwidth for uplink communication, and apply the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths as the bandwidth for downlink communication, during the period from when the receiving unit receives the system information to when the setting information of the supported channel bandwidth is received.

[0129] According to the above structure, in the case where the terminal does not support the carrier bandwidth notified in SIB1, it is possible to clearly stipulate the frequency bandwidth used for uplink communication of the terminal and the frequency bandwidth used for downlink communication of the terminal from the time the carrier bandwidth is notified in the SIB1 until the base station sets the channel bandwidth actually supported by the terminal to the terminal using dedicated signaling based on the UE capability received from the terminal.

[0130] A communication method comprises: a step of receiving system information; and a step of, in response to detecting that a channel bandwidth included in the system information received by the receiving unit is not supported, setting the bandwidth of an initial bandwidth part (BWP) and the maximum bandwidth among the supported maximum bandwidths as the frequency bandwidth for communication during a period from the time the system information is received to the time information setting of the supported channel bandwidth is received.

[0131] According to the above structure, in the case where the terminal does not support the carrier bandwidth notified in SIB1, it is possible to clearly stipulate the frequency bandwidth used for communication by the terminal from the time the carrier bandwidth is notified in the SIB1 until the base station sets the channel bandwidth actually supported by the terminal to the terminal using dedicated signaling based on the UE capabilities received from the terminal.

[0132] A terminal comprises: a receiving unit for receiving system information; and a control unit for setting the bandwidth of an initial bandwidth part (BWP) and the maximum bandwidth among supported maximum bandwidths when the channel bandwidth indicated by the system information received by the receiving unit is not supported.

[0133] The control unit may also apply the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths as the frequency bandwidth for downlink communication.

[0134] The control unit may also apply the bandwidth of the initial uplink BWP and the maximum bandwidth among the supported maximum bandwidths as the frequency bandwidth for uplink communication.

[0135] The control unit may also apply the bandwidth of the initial uplink BWP and the maximum bandwidth among the supported maximum bandwidths as the bandwidth for uplink communication, and apply the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths as the bandwidth for downlink communication.

[0136] The control unit may set the bandwidth of the initial bandwidth part (BWP) and the maximum bandwidth among the supported maximum bandwidths during a period from when the receiving unit receives the system information until the setting information set on the base station side is set.

[0137] A communication method performed by a terminal comprises: a step of receiving system information; and a step of setting the bandwidth of an initial bandwidth part (BWP) and a maximum bandwidth among supported maximum bandwidths when a channel bandwidth indicated by the received system information is not supported.

[0138] A base station comprises: a transmitting unit for transmitting system information; and a receiving unit for receiving signals from a user device that does not support the channel bandwidth indicated by the system information transmitted by the transmitting unit, within a maximum bandwidth between the bandwidth of an initial bandwidth part (BWP) and a maximum supported bandwidth.

[0139] (Supplementary Implementation Methods)

[0140] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments. Those skilled in the art will understand various variations, modifications, substitutions, and replacements. Specific numerical examples are used to facilitate understanding of the invention, but unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The distinction between items in the above description is not essential to the present invention. Matters recorded in two or more items may be combined as needed, and matters recorded in one item may also be applied to matters recorded in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram are not necessarily limited to corresponding physical component boundaries. The operations of multiple functional units may also be performed by a single physical component, or the operations of a single functional unit may also be performed by multiple physical components. The order of processing described in the embodiments may be reversed as long as there is no contradiction. For the convenience of processing description, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices may also be implemented by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention, and the software operated by the processor of the terminal 20 according to the embodiment of the present invention can also be stored in any appropriate storage medium such as random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, etc.

[0141] In addition, the notification of information is not limited to the manner / implementation method described in the present disclosure, and may also be performed using other methods. For example, the notification of information may also be implemented through physical layer signaling (such as DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (such as RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, and may also be, for example, an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc.

[0142] Each aspect / embodiment described in this disclosure may also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems utilizing other appropriate wireless communication methods, and next-generation systems derived from these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0143] The processing procedures, timings, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present various step elements, but are not limited to the specific order presented.

[0144] In this disclosure, specific operations performed by base station 10 may, depending on the circumstances, be performed by its upper node. Obviously, in a network including one or more network nodes including base station 10, various operations performed to communicate with terminal 20 may be performed by at least one of base station 10 and other network nodes other than base station 10 (e.g., MME or S-GW, but not limited thereto). While the example above illustrates a single other network node other than base station 10, a combination of multiple other network nodes (e.g., MME and S-GW) may also be used.

[0145] Information can be output from a higher layer (or lower layer) to a lower layer (or higher layer), or can be input and output via multiple network nodes.

[0146] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, etc. can be rewritten, updated, or appended. Output information, etc. can also be deleted. Input information, etc. can also be sent to other devices.

[0147] The determination may be made based on a value represented by one bit (0 or 1), a truth value (Boolean value: true or false), or a comparison of numerical values (eg, comparison with a specific value).

[0148] Each method / implementation described in this disclosure may be used alone, in combination, or in conjunction with an execution switch. Furthermore, notification of specific information (e.g., notification of "yes X") is not limited to being performed explicitly but may also be performed implicitly (e.g., by not notifying the specific information).

[0149] Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning commands, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0150] Furthermore, software, instructions, information, and the like may also 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 a wired technology (coaxial cable, fiber optic cable, twisted pair, DSL, etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0151] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0152] It should be noted that the terms described in this disclosure and the terms required to understand 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). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0153] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0154] Furthermore, information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to a specific value, or by corresponding other information. For example, wireless resources may also be indicated by an index.

[0155] The names used for the above parameters, etc., are not intended to be limiting in any respect. Furthermore, the mathematical formulas, etc., using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0156] In this disclosure, terms such as "base station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0157] A base station can accommodate one or more (for example, 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 provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head). Terms such as "cell" or "sector" refer to a part or the entire coverage area of at least one of the base station and the base station subsystem that provides communication services within the coverage area.

[0158] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0159] In some cases, a mobile station is also referred to by those skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handheld device, a user agent, a mobile client, a client, or some other appropriate terminology.

[0160] 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. It should be noted that at least one of the base station and the mobile station may be a device carried by a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (such as a car, an airplane, etc.), a mobile body that moves in an unmanned manner (such as a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). It should be noted 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 also be an IoT (Internet of Things) device such as a sensor.

[0161] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, the various methods / implementations of the present invention may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, which may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything)). In this case, it may be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned terminal 20. In addition, words such as "uplink" and "downlink" may also be replaced by words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels. Similarly, the user terminal in the present disclosure may also be replaced by a base station. In this case, it may be set as a structure in which the terminal 20 has the functions possessed by the above-mentioned user terminal 20.

[0162] The terms "connected", "coupled", or all variations thereof refer to any direct or indirect connection or combination between two or more elements, and may include one or more intermediate elements between the two elements being "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connect" may also be replaced by "access". As used in this disclosure, when two elements are connected, it may be considered to use at least one of one or more wires, cables, and printed electrical connections, and as several non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (both visible and invisible) region, etc., to "connect" or "couple" to each other.

[0163] The reference signal can also be simply referred to as RS (Reference Signal), and may also be called a pilot signal (Pilot) depending on the applied standard.

[0164] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0165] Any reference to an element using the terms "first," "second," etc., as used in this specification does not necessarily limit the quantity or order of these elements. These terms may be used in this specification as a convenient way to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements may be used, or that the first element necessarily takes precedence over the second element in any manner.

[0166] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" as used in this specification or claims does not refer to a logical exclusive OR.

[0167] A wireless frame may be composed of one or more periods (frames) in the time domain.

[0168] In the time domain, each frame in one or more frames may also be referred to as a subframe.

[0169] A subframe may also be composed of one or more time slots in the time domain. A subframe may also be of a fixed duration (eg, 1 ms) that is independent of a numerology.

[0170] A parameter set may be a communication parameter applied to the transmission and / or reception of a certain signal and / or channel. The parameter set may represent, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0171] A time slot may also be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0172] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (or PUSCH) mapping type B.

[0173] Each of radio frame, subframe, slot, mini slot, and symbol represents a time unit for signal transmission. Radio frame, subframe, slot, mini slot, and symbol may be referred to by other names corresponding to each other.

[0174] For example, a subframe can also be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, and a slot or a mini-slot can also be called a TTI. In other words, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0175] Here, TTI refers to the minimum time unit used for scheduling in wireless communications. For example, in LTE systems, a base station schedules each terminal to allocate radio resources (such as the frequency bandwidth and transmit power that each terminal can use) in TTI units. The definition of TTI is not limited to this.

[0176] The TTI can also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and can also be used as a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0177] It should be noted that when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be used as the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can also be controlled.

[0178] A TTI with a duration of 1 ms may also be referred to as 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 time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0179] It should be noted that a long TTI (such as a normal TTI, subframe, etc.) can also be replaced by a TTI with a duration of more than 1ms, and a short TTI (such as a shortened TTI, etc.) can also be replaced by a TTI with a TTI length less than the long TTI and more than 1ms.

[0180] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0181] Furthermore, an RB may include one or more symbols in the time domain and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may also be composed of one or more resource blocks.

[0182] It should be noted that one or more RBs may also be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0183] 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.

[0184] A bandwidth part (BWP) (also known as a fractional bandwidth) can represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a particular carrier. Common RBs can be identified by their index relative to a common reference point for that carrier. PRBs can be defined by a BWP and numbered within that BWP.

[0185] 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.

[0186] At least one of the configured BWPs may be active, and the UE may not assume that it will transmit or receive specific signals / channels outside of the active BWP. It should be noted that "cell," "carrier," etc. in this disclosure may also be replaced by "BWP."

[0187] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various variations are possible, including the number of subframes within a radio frame, the number of slots within each subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0188] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in plural form.

[0189] In this disclosure, the term "A is different from B" may also mean "A and B are different from each other." It should be noted that the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may be interpreted similarly.

[0190] While the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented in the form of modifications and variations without departing from the spirit and scope of the present disclosure as specified by the claims. Therefore, the description in this specification is for illustrative purposes only and does not have any limiting meaning on the present invention.

[0191] This international patent application claims the benefit of priority based on Japanese Patent Application No. 2019-158009, filed on August 30, 2019, the entire contents of which are incorporated herein by reference.

[0192] Description of labels

[0193] 10 base stations

[0194] 110 Sending Unit

[0195] 120 receiving unit

[0196] 130 control unit

[0197] 20 Terminal

[0198] 210 Sending Unit

[0199] 220 receiving unit

[0200] 230 control unit

[0201] 1001 Processor

[0202] 1002 Storage Device

[0203] 1003 Auxiliary storage device

[0204] 1004 Communication device

[0205] 1005 Input Device

[0206] 1006 Output Device

Claims

1. A terminal comprising: a receiving unit that receives system information; and The control unit uses the maximum bandwidth of the initial bandwidth part, i.e., the bandwidth of the initial BWP, and the maximum bandwidth supported when the channel bandwidth indicated by the system information received by the receiving unit is not supported, The control unit uses the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths as a frequency bandwidth for downlink communication, The position and bandwidth of the information element are set so that the initial downlink BWP includes the entire CORESET#0 of the serving cell.

2. The terminal according to claim 1, wherein: The control unit uses a bandwidth of an initial uplink BWP and a maximum bandwidth among the supported maximum bandwidths as a frequency bandwidth for performing uplink communication.

3. The terminal according to claim 1, wherein: After the receiving unit receives the system information, if the RRC connection with the base station side is not established, the control unit uses the maximum bandwidth of the initial bandwidth part, ie, the bandwidth of the initial BWP, and the supported maximum bandwidth.

4. A communication method performed by a terminal, comprising: Step of receiving system information; and In the case where the channel bandwidth indicated by the received system information is not supported, a step of using the bandwidth of the initial bandwidth part, i.e., the bandwidth of the initial BWP and the maximum bandwidth among the supported maximum bandwidths, Using the bandwidth of the initial downlink BWP and the maximum bandwidth among the maximum supported bandwidths as the frequency bandwidth for downlink communication, The position and bandwidth of the information element are set so that the initial downlink BWP includes the entire CORESET#0 of the serving cell.

5. A base station comprising: a sending unit for sending system information; and The receiving unit receives a signal in the maximum bandwidth between the initial bandwidth part, i.e., the initial BWP bandwidth, and the maximum supported bandwidth for a terminal that does not support the channel bandwidth indicated by the system information sent by the sending unit. As the frequency bandwidth for downlink communication, the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths are used. The position and bandwidth as the information element are set so that the initial downlink BWP includes the entire CORESET#0 of the serving cell.

6. A communication system comprising a terminal and a base station, The terminal has: A receiving unit, receiving system information; and The control unit uses the maximum bandwidth of the initial bandwidth part, i.e., the bandwidth of the initial BWP, and the maximum bandwidth supported when the channel bandwidth indicated by the system information received by the receiving unit is not supported, The control unit uses the bandwidth of the initial downlink BWP and the maximum bandwidth among the supported maximum bandwidths as a frequency bandwidth for downlink communication, The location and bandwidth of the information element are set so that the initial downlink BWP includes the entire CORESET#0 of the serving cell. The base station has: A sending unit, which sends system information; and The receiving unit receives signals from a terminal that does not support the channel bandwidth indicated by the system information sent by the sending unit in the maximum bandwidth between the initial bandwidth part, ie, the initial BWP, and the supported maximum bandwidth.

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