Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one aspect of the present disclosure comprises: a transmission unit that transmits capability information indicating that the use of multiple carriers in one serving cell is supported; and a control unit that controls at least one of transmission and reception in the one serving cell. This aspect of the present disclosure makes it possible to use multiple carriers efficiently.

Description

Technical Field

[0001] This disclosure relates to a terminal, a wireless communication method in a next-generation mobile communication system 、 base station and system and is related to.

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was specified for the purpose of further high-speed data rates, low latency, etc. (Non-Patent Document 1). Also, for the purpose of further large capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9), LTE-Advanced (3GPP Rel. 10-14) was specified.

[0003] Successor systems to LTE (for example, also referred to as 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also being considered.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In future wireless communication systems (e.g., Beyond 5G, 6G), improvements in frequency utilization efficiency are being considered. For example, treating multiple frequency carriers as a single virtual cell is being explored.

[0006] However, existing constraints may prevent efficient resource utilization, potentially leading to a decrease in communication throughput.

[0007] Therefore, this disclosure relates to a terminal and wireless communication method that efficiently utilize multiple carriers. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of the present disclosure includes a transmitting unit that transmits capability information indicating that it supports the use of multiple carriers in a single serving cell, and a control unit that controls at least one of transmission and reception in the single serving cell, wherein the multiple carriers are 、1 Multiple DL carriers with different center frequencies within two time-division duplex (TDD) bands, and one U L-carrier A Contains fruit , For the frequency resources of a combination of multiple downlink bandwidth portions (BWPs) spanning multiple DL carriers, a continuous index is assigned as the frequency index used for scheduling. . [Effects of the Invention]

[0009] According to one aspect of this disclosure, multiple carriers can be used efficiently. [Brief explanation of the drawing]

[0010] [Figure 1] Figures 1A and 1B show an example of a slot configuration. [Figure 2] Figure 2 shows an example of an XDD configuration. [Figure 3]Figures 3A and 3B show an example of resource settings in the time domain and frequency domain for XDD operation. [Figure 4] Figure 4 shows an example of an NR band in FR1. [Figure 5] Figure 5 shows an example of a combination of TDD bands and SUL bands in FR1. [Figure 6] Figures 6A to 6C show an example of multiple carriers within one existing serving cell. [Figure 7] Figures 7A to 7C show an example of multiple carriers within one serving cell according to the first embodiment. [Figure 8] Figures 8A to 8C show an example of initial access using multiple carriers within one serving cell according to the second embodiment. [Figure 9] Figure 9 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment. [Figure 10] Figure 10 is a diagram showing an example of the configuration of a base station according to an embodiment. [Figure 11] Figure 11 is a diagram showing an example of the configuration of a user terminal according to an embodiment. [Figure 12] Figure 12 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. [Figure 13] Figure 13 is a diagram showing an example of a vehicle according to an embodiment.

Mode for Carrying Out the Invention

[0011] (Improvement of Frequency Utilization Efficiency) In future wireless communication systems (e.g., Beyond 5G, 6G), improving frequency utilization efficiency (e.g., enhancing the efficiency of existing frequency bands) is being considered. Specifically, elastic cells that regard multiple frequency bands as a virtual single cell, intra-carrier / inter-carrier cross-division duplex (XDD) where a base station performs transmission and reception simultaneously, etc. are being considered.

[0012] (XDD) In LTE up to Rel.14, Frequency Division Duplex (FDD) was mainly commercialized and also supported Time Division Duplex (TDD).

[0013] On the other hand, in NR from Rel.15, TDD is mainly considered and also supports FDD (e.g., migration of LTE bands, etc.).

[0014] In FDD, DL reception and UL transmission can be performed simultaneously, which is preferable from the perspective of delay reduction. On the other hand, in FDD, the resource ratio of DL and UL is fixed (e.g., 1:1).

[0015] In TDD, it is possible to change the ratio of DL and UL resources. For example, in a general environment where DL traffic is relatively large, it is possible to increase the amount of DL resources and improve the DL throughput.

[0016] On the other hand, considering the time ratio of transmission and reception using Time Division Duplex (TDD) up to Rel.16, there are cases where the opportunities to transmit UL signals / channels are fewer than the opportunities to receive DL signals / channels. In such cases, the UE may not be able to transmit UL signals / channels frequently, raising concerns about delays in the transmission of important UL signals / channels. Furthermore, because the opportunities to transmit UL signals are fewer than the opportunities to receive DL signals, signal / channel congestion during UL transmission is also a concern. In addition, since the time resources available for transmitting UL signals / channels are limited in TDD, the application of UL coverage extension techniques such as repetition transmission is also limited.

[0017] In future wireless communication systems (e.g., Rel.17 / 18 and beyond), the introduction of a division duplex method combining TDD and Frequency Division Duplex (FDD) for UL and DL is being considered.

[0018] The division-duplex method may also be called XDD (Cross Division Duplex). XDD may mean a duplex method that frequency-division multiplexes DL and UL (allowing simultaneous use of DL and UL) within one component carrier (CC) of the TDD band, or across multiple CCs. When the duplex method is applied to multiple CCs, it may mean that in the time resources where DL is available in one CC, UL is available in another CC. The multiple CCs may be CCs in the same band.

[0019] Figure 1A shows an example of a TDD configuration as defined up to Rel. 16. In this example, the UE is configured with TDD slots / symbols using the bandwidth of one component carrier (CC) (which may also be called a cell or serving cell).

[0020] In the example shown in Figure 1A, the time ratio of DL slots to UL slots is 4:1. With this conventional TDD slot / symbol setting, sufficient UL time resources cannot be secured, which may lead to UL transmission delays and a decrease in coverage performance.

[0021] Figure 1B shows an example of an XDD configuration. In this example, within a single component carrier (CC), the resources used for receiving DLs and the resources used for transmitting ULs overlap in time. This resource configuration allows for the allocation of UL resources and improves resource utilization efficiency.

[0022] For example, as shown in the example in Figure 1B, by configuring DLs at both ends of the frequency domain in a 1CC and sandwiching UL resources between the DLs, it is possible to avoid and mitigate cross-link interference (CLI) with neighboring carriers. In addition, a guard region may be set at the boundary between the DL resources and the UL resources.

[0023] Considering the complexity of handling self-interference, it is conceivable that only base stations use DL and UL resources simultaneously. In other words, for resources where DL and UL overlap in time, one UE may use the DL resource while another UE uses the UL resource.

[0024] Figure 2 shows an example of an XDD configuration. In this example, a portion of the DL resources in the TDD band are used as UL resources, resulting in a configuration where DL and UL partially overlap in time.

[0025] In this example, during the DL-only period, each of the multiple UEs (UE#1 and UE#2 in this example) receives the DL channel / signal.

[0026] Furthermore, during periods when DL and UL overlap in time, one UE (UE#1 in this example) receives the DL channel / signal, while another UE (UE#2 in this example) transmits the UL channel / signal. During this period, the base station performs simultaneous transmission and reception of DL and UL.

[0027] Furthermore, during UL-only periods, each of the multiple UEs transmits a UL channel / signal.

[0028] In existing NRs (e.g., those defined up to Rel. 15 / 16), DL frequency resources and UL frequency resources in a UE carrier are configured as DL Bandwidth Parts (BWPs) and UL BWPs, respectively. Switching between DL / UL frequency resources requires the configuration of multiple BWPs and a BWP adaptation mechanism.

[0029] Furthermore, in existing NRs, the time resources in the TDD carrier for UE are configured in the TDD settings as at least one of DL, UL, and Flexible (FL).

[0030] Methods for configuring time-domain and frequency-domain resources for XDD operation are being investigated. For example, for UE#1 in Figure 2, it is conceivable to configure the XDD resources (the period during which DL and UL overlap) while avoiding the use of portions of the UL resources used by other UEs (e.g., UE#2) (see Figure 3A).

[0031] Furthermore, for example, for UE#2 in Figure 3, it is possible to configure the XDD resources while avoiding the use of the DL resources used by other UEs (e.g., UE#1) (see Figure 3B).

[0032] (analysis) In elastic cells and inter-carrier XDD, multiple carriers are bundled together and treated as a single virtual cell. By performing control and UL on only specific carriers within that group, the remaining carriers can be used for data communication. This enables low overhead. Carrier aggregation (CA)-enabled UEs can perform control / UL on only specific carriers through cross-carrier scheduling during RRC connections. However, non-CA-enabled UEs and UEs during initial access cannot perform control / UL on only specific carriers.

[0033] In NRs up to Rel.17, UEs, with the exception of supplementary uplinks (SULs), cannot treat multiple carriers as a single cell for initial access.

[0034] Figure 4 shows an example of NR bands in FR1. In existing specifications, the carriers / bands that can be set as SUL are limited to certain bands. In FR1, the bands for SUL are only NR bands n80 to n84, n86, and n89 (703 to 1980 MHz). Figure 5 shows an example of TDD band and SUL band combinations in FR1. The bands for SUL are specified to be combined only with TDD NR bands n41, n77 to n78 (2496 to 5000 MHz) (see, for example, Figure 5).

[0035] When the UE detects a synchronization signal block (SSB, SS / physical broadcast channel (PBCH) block), it reads the PDCCH (SIB1 PDCCH) that schedules system information block (SIB)1 on that frequency carrier and the PDSCH (SIB1 PDSCH) that carries SIB1, and performs a random access channel (RACH) procedure on the same frequency carrier based on the BWP setting contained in SIB1.

[0036] If a supplementaryUplink element exists in the servingCellConfigCommon, and if the UE supports one or more frequency bands indicated in the frequencyBandList for the SUL, and if the UE supports an uplink channel bandwidth with a maximum transmit bandwidth setting that is greater than or equal to the bandwidth of the SUL's initial uplink BWP, then the UE is considered to have configured the SUL within the serving cell.

[0037] The Common RACH setting (RACH-ConfigCommon) may include a reference signal received power (RSRP) threshold (rsrp-ThresholdSSB-SUL) for selecting between normal uplink (NUL) carriers and SUL carriers. If the RSRP of the downlink path loss reference is less than the threshold, the UE selects the SUL carrier for random access procedures. Otherwise, the UE selects the NUL carrier for random access procedures. Here, as mentioned above, the frequency of the SUL carrier is lower than the frequency of the NUL carrier.

[0038] The RA-RNTI associated with a PRACH occasion in which a random access preamble is sent is calculated using the UL carrier ID (ul_carrier_id). The UL carrier ID indicates the UL carrier used for sending the random access preamble, and is 0 for NUL carriers and 1 for SUL carriers.

[0039] Existing UEs require one of the following configurations 1 or 2 to use the DL carrier on which SSB and SIB1 are transmitted, and another UL carrier, for initial access (RACH). [Setting 1] DL carriers and UL carriers in the FDD band are associated (paired). [Setting 2] The UL carrier in the SUL band and the DL carrier in the TDD band are associated.

[0040] SSB and SIB1 are transmitted on the same carrier.

[0041] Due to the above limitations in NR up to Rel.17, there is a risk that elastic cells and inter-carrier XDD may not be able to be operated efficiently. In this case, communication throughput may decrease.

[0042] Therefore, the inventors conceived a method for treating multiple carriers together as a single serving cell. According to one aspect of this disclosure, efficient use of multiple bandwidths and low overhead can be achieved.

[0043] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0044] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0045] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0046] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, information elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0047] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0048] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0049] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0050] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0051] In this disclosure, SIB1 PDCCH, Type0-PDCCH, Type0-PDCCH common search space (CSS) set, and PDCCH / DCI for scheduling SIB1 may be interpreted as mutually exclusive. In this disclosure, SIB1, SIB1 PDSCH, and PDSCH scheduled by Type0-PDCCH may be interpreted as mutually exclusive.

[0052] In this disclosure, carrier, frequency, center frequency, spectrum, and BWP may be interpreted interchangeably. In this disclosure, UL and normal uplink (NUL) may be interpreted interchangeably.

[0053] In this disclosure, capability, UE capability, and UE capability information may be interpreted as mutually exclusive.

[0054] (Wireless communication method) <First Embodiment> 《UE ability》 The ability to support the use of multiple different carriers as DL / UL for a single serving cell (new UE capability, new UE capability information) may be specified. This new UE capability may be specified as a capability separate from CA support.

[0055] The new UE capability may be defined for at least one of the following cases: the case in which the multiple carriers include DL carriers and UL carriers; the case in which the multiple carriers include multiple DL carriers; and the case in which the multiple carriers include multiple UL carriers.

[0056] While the UE processes HARQ-ACKs separately for multiple serving cells in a CA, it may process HARQ-ACKs for multiple carriers in a single serving cell together. In this case, the load on the UE can be reduced.

[0057] The multiple carriers do not have to be a pair of DL carriers and UL carriers within a single FDD band. The multiple carriers may include DL / UL carriers with different center frequencies within a single TDD band. The multiple carriers may include one of the DL carriers and UL carriers within a single TDD band and a carrier from another band.

[0058] The multiple carriers may span multiple bands. The multiple bands do not have to include the SUL band. The multiple bands may include multiple FDD bands, or one or more TDD bands, or bands of different duplex schemes (for example, one or more FDD bands and one or more TDD bands).

[0059] Figures 6A to 6C show examples of multiple carriers within an existing serving cell. In the example in Figure 6A, one serving cell contains UL and DL carriers within one FDD band. In the example in Figure 6B, one serving cell contains UL and DL carriers with the same center frequency within one TDD band. In the example in Figure 6C, one serving cell contains NUL and DL carriers with the same center frequency within one TDD band, and SUL carriers within one SUL band.

[0060] Figures 7A to 7C show examples of multiple carriers in a single serving cell according to the first embodiment. As in the example in Figure 7A, a single serving cell may contain UL / DL carriers in multiple FDD bands. As in this example, a single serving cell may contain UL and DL carriers in a first FDD band and UL and DL carriers in a second FDD band. As in the example in Figure 7B, a single serving cell contains UL and DL carriers with different center frequencies in one or more TDD bands. Here, the number of UL / DL carriers in a single TDD band does not have to be one. As in this example, a single serving cell may contain two DL carriers and one UL carrier in a single TDD band. As in the example in Figure 7C, a single serving cell may contain UL / DL carriers in multiple bands, and those multiple bands may include TDD bands, with each TDD band containing only one UL carrier and one DL carrier. As in this example, a serving cell may include one UL carrier in one TDD band and a DL carrier in another band (e.g., a TDD band or an FDD band).

[0061] DL BWP and UL BWP for multiple different carriers may be configured within a serving cell. DL / UL BWP may be configured within a serving cell for a UE having the aforementioned new UE capability, using an offset from the NR-Absolute Radio Frequency Channel Number (ARFCN, number on the global frequency raster) / pointA (common reference point of the RB grid) (e.g., resource block (RB) offset) and bandwidth (e.g., number of RBs).

[0062] A UE may report as a capability (information in the new UE capability information) whether or not it supports simultaneous transmission and reception of DL and UL.

[0063] The specifications may define / limit the combinations of multiple DL / UL bands that can be used as a single serving cell. For example, such combinations may be limited to TDD bands only, or to FDD bands only, or to multiple carriers within the same band (intra-band), or to FR1 (combinations of bands within FR1). When multiple carriers within the same TDD band are used for DL ​​and UL, simultaneous transmission and reception on those multiple carriers may not be possible, and the feasibility of simultaneous transmission and reception using multiple carriers within the same TDD band may be determined based on the support for same-carrier / intra-band XDD.

[0064] A UE having the aforementioned new UE capability or another new UE capability may support (or be configured to support) one or more DL BWPs on different carriers within a single serving cell. At least one of the following may be reported as capability (information in the new UE capability information): the number of DL BWPs (maximum), the number of carriers (maximum), the total bandwidth of the DL / BWPs (maximum bandwidth), the total bandwidth of the carriers (maximum bandwidth), the bandwidth from the lower frequency limit to the upper frequency limit of the DL / BWPs (maximum bandwidth), and the bandwidth from the lower frequency limit to the upper frequency limit of the carriers (maximum bandwidth).

[0065] At any given time within a single serving cell, one DL BWP may be active, or multiple DL BWPs may be active.

[0066] UL BWP may be the same as DL BWP described above. A UE having the aforementioned new UE capability or another new UE capability may support (or be configured to support) one or more UL BWPs on different carriers within a single serving cell, or it may support (or be configured to support) one UL BWP on different carriers within a single serving cell. A UE having the aforementioned new UE capability or another new UE capability may (or be configured to support) one or more DL BWPs and one UL BWP on different carriers within a single serving cell.

[0067] At any given time within a single serving cell, one UL BWP may be active, or multiple UL BWPs may be active.

[0068] Combinations of DL carriers and UL carriers If multiple different carriers within a single serving cell are used for DL ​​and UL (i.e., multiple carriers within a single serving cell include DL carriers and UL carriers with different center frequencies, or a single serving cell includes multiple TDD carriers), the UE may follow at least one of the following time resource determination methods 1 and 2. [Time Resource Determination Method 1] If simultaneous transmission and reception is not possible (the UE does not support simultaneous transmission and reception), the UE may determine the available time resources for each carrier according to a single TDD UL / DL configuration (or a TDD UL / DL configuration common to multiple carriers). [Time Resource Determination Method 2] If simultaneous transmission and reception is possible (the UE supports simultaneous transmission and reception), the UE may determine the available time resources for each carrier according to the TDD UL / DL settings of each carrier. The TDD UL / DL settings (link direction) may or may not be the same among the multiple carriers at a given time. Alternatively, even if simultaneous transmission and reception is possible, the UE may follow a single TDD UL / DL setting, and the availability of simultaneous transmission and reception for each time resource may be determined by a separate setting (for example, a setting for XDD).

[0069] Combinations of multiple DL carriers If multiple different carriers within a single serving cell are used for DL ​​(i.e., multiple carriers within a single serving cell include multiple DL carriers), the UE may follow at least one of DL BWP usage methods 1 and 2 below.

[0070] [DL BWP usage method 1] The UE may treat a combination of multiple DL BWPs (e.g., multiple DL BWPs spanning multiple carriers) as a single DL BWP. Within that single DL BWP, resources / channels / signals spanning multiple carriers may be configured / scheduled. These resources / channels / RS may be CORESET / PDSCH / CSI-RS, etc. The single DL BWP may be considered as a DL BWP consisting of pseudo-continuous frequency resources. A continuity index may be given to the frequency resources within the single DL BWP as the frequency index (e.g., RB index) used for scheduling within the single DL BWP. The subcarrier spacing (SCS) may be common among the multiple DL BWPs (within the single DL BWP).

[0071] [DL BWP usage method 2] Multiple DL BWPs (sets of multiple DL BWPs) may be active simultaneously. Resources / channels / signals may be configured / scheduled across these multiple DL BWPs (multiple carriers). The UE may be specified not to assume that resources / channels / signals are configured / scheduled across these multiple DL BWPs (multiple carriers). The resource / channel / RS may be confined to only one DL BWP (or closed). The resource / channel / RS may be a CORESET / PDSCH / CSI-RS, etc. The SCS may be common among the multiple DL BWPs. It may be permissible for the SCS to be different among the multiple DL BWPs. The BWP switch may operate by simultaneously switching one of the multiple DL BWPs to another multiple DL BWP. The multiple DL BWPs may be activated / deactivated (on / off) individually one by one, or switched one by one to another DL BWP.

[0072] According to this embodiment, the UE can improve frequency utilization efficiency by using multiple carriers (for example, not just one pair of FDD carriers (paired spectrum) and not including SUL) as DL carriers and UL carriers within a single serving cell.

[0073] <Second Embodiment> The UE may utilize (or support) multiple different carriers during initial access. These multiple carriers may be contained within a single serving cell. The UE may receive SSB (at least one of the synchronization signal and PBCH) on at least one of these multiple carriers.

[0074] Figures 8A to 8C show an example of initial access using multiple carriers within a single serving cell according to the second embodiment.

[0075] As shown in the example in Figure 8A, one serving cell contains UL carriers and DL carriers having different center frequencies within one TDD band. Here, the number of UL / DL carriers within one TDD band is not necessarily one. As in this example, one serving cell may contain a first DL carrier, an UL carrier, and a second DL carrier within one TDD band. The UE may receive SSB on the second DL carrier, receive SIB1 PDSCH on the first DL carrier, and the SIB1 may indicate an initial UL BWP in the UL carrier.

[0076] As shown in the example in Figure 8B, a single serving cell contains UL carriers and DL carriers having different center frequencies in multiple TDD bands. Here, the number of UL / DL carriers in a single TDD band is not necessarily one. As in this example, a single serving cell may contain UL carriers in a first TDD band and DL carriers in a second TDD band. The UE may receive SSB and SIB1 PDSCH on the DL carrier and indicate the initial UL BWP in the UL carrier by SIB1.

[0077] As shown in the example in Figure 8C, a single serving cell may contain UL / DL carriers in multiple FDD bands. As in this example, a single serving cell may contain a first UL carrier and a second DL carrier in the first FDD band, and a first UL carrier and a second DL carrier in the second FDD band. The UE may receive an SSB on the first DL carrier, receive an SIB1 PDSCH on the second DL carrier, and be indicated by SIB1 with an initial UL BWP on the first UL carrier.

[0078] Different UL carriers during initial access UL carriers on bands other than those defined for SUL (e.g., bands defined for TDD / FDD / XDD) may be set / indicated by system information (e.g., SIB1).

[0079] A UL carrier (initial UL BWP) on a different carrier (center frequency) than SIB1 may be announced / broadcast by SIB1. SIB1 may also announce / broadcast the parameters of the initial UL BWP and the NR-ARFCN / pointA of that UL carrier. Only UEs that support the announcement of that initial UL BWP may recognize that announcement (that initial UL BWP). The announcement of that initial UL BWP may be a mandatory function in a specific frequency range (FR) / band / release. The UE may perform UL transmissions (such as random access procedures) on the initial UL BWP announced by SIB1.

[0080] Multiple download carriers during initial access The UE may be instructed / configured to receive SIB1 PDCCH / SIB1 PDSCH on a carrier different from the carrier that received the SSB. The UE may follow at least one of the following carrier determination methods 1 to 3. [Career Decision Method 1] Multiple band / carrier candidates may be specified in the specification. An information element / field within the MIB (PBCH) may indicate one of these candidates. The UE may monitor the SIB1 PDCCH (Type0-PDCCH) on the carrier of the indicated candidate. [Career Decision Method 2] Multiple band / carrier candidates may be specified in the specification. A field within the SIB1 PDSCH may indicate one of these candidates. The UE may receive the SIB1 PDSCH on the indicated candidate carrier. [Career Decision Method 3] The receiving band / carrier for SIB1 PDCCH / SIB1 PDSCH may be specified in the specification. The association between the detected SSB band / carrier and the receiving band / carrier for SIB1 PDCCH / SIB1 PDSCH may be specified in the specification. The derivation rule (calculation formula) for the receiving band / carrier for SIB1 PDCCH / SIB1 PDSCH from the detected SSB band / carrier may be specified in the specification. The UE may determine a carrier different from the receiving carrier for SIB1 PDCCH / SIB1 PDSCH as the receiving carrier according to the specification. The UE may receive SIB1 PDCCH / SIB1 PDSCH on the determined carrier.

[0081] Random access procedures on different carriers during initial access In IDLE mode, the UE may be instructed / configured to perform a random access procedure (e.g., send a random access preamble) on a carrier different from the one it is camped on (located on).

[0082] Information regarding the carrier / BWP used in the random access procedure may be notified / broadcast by SIB1. This information may include the parameters of the BWP and the NR ARFCN / pointA of the carrier / BWP.

[0083] According to this embodiment, the UE can improve frequency utilization efficiency by using multiple carriers (for example, not just one pair of FDD carriers (paired spectrum) and not including SUL) for initial access.

[0084] <Other Embodiments> 《UE Ability Information / Higher Layer Parameters》 Higher layer parameters (RRC IE) / UE capabilities may be defined corresponding to the features in each of the above embodiments. The higher layer parameters may indicate whether or not to enable the feature. The UE capabilities may indicate whether or not the UE supports the feature.

[0085] A UE that has the corresponding higher-level parameter set may perform that function. It may also be stipulated that "a UE that does not have the corresponding higher-level parameter set may not perform that function (for example, according to Rel. 15 / 16)."

[0086] A UE that reports / submits UE capability indicating support for that function may perform that function. It may be stipulated that "a UE that has not reported UE capability indicating support for that function shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0087] If the UE reports / sends a UE capability indicating support for that function, and the corresponding higher-layer parameters are set, the UE may perform that function. It may also be stipulated that "if the UE does not report / send a UE capability indicating support for that function, or if the corresponding higher-layer parameters are not set, the UE shall not perform that function (e.g., in accordance with Rel. 15 / 16)."

[0088] Which of the above multiple embodiments / options / choices / features is used may be set by higher-layer parameters, reported by the UE as UE capability, specified in the specification, or determined by the reported UE capability and the setting of the higher-layer parameters.

[0089] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0090] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0091] Figure 9 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0092] Furthermore, the wireless communication system 1 may support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and so on.

[0093] In EN-DC, the LTE (E-UTRA) base station (eNB) is the Master Node (MN), and the NR base station (gNB) is the Secondary Node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0094] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0095] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0096] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of Carrier Aggregation (CA) using multiple Component Carriers (CC) and Dual Connectivity (DC).

[0097] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may fall in a frequency band higher than FR2.

[0098] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0099] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0100] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0101] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0102] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0103] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0104] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0105] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0106] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0107] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0108] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0109] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0110] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0111] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0112] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0113] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0114] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0115] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0116] (base station) Figure 10 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0117] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0118] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0119] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0120] The transmitting / receiving unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0121] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0122] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0123] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0124] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0125] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0126] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0127] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0128] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 130.

[0129] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0130] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), reception quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0131] The transmission path interface 140 may send and receive signals (backhaul signaling) with devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0132] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0133] The transmitting / receiving unit 120 may receive capability information indicating support for using multiple carriers in a single serving cell. The control unit 110 may control at least one of the transmission and reception in the single serving cell.

[0134] The control unit 110 may use multiple carriers for initial access. The transmitting / receiving unit 120 may transmit a synchronization signal and at least one broadcast channel on at least one of the multiple carriers.

[0135] (User terminal) Figure 11 shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that one or more of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0136] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each part described below may be omitted.

[0137] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., as described based on common understanding in the technical field related to this disclosure.

[0138] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc., using the transmitting / receiving unit 220 and the transmitting / receiving antenna 230. The control unit 210 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transmitting / receiving unit 220.

[0139] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0140] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0141] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0142] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0143] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0144] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0145] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion, and output a baseband signal.

[0146] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0147] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0148] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc., on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0149] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0150] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0151] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0152] The transceiver 220 may transmit capability information (e.g., new UE capability) indicating support for using multiple carriers in a single serving cell. The control unit 210 may control at least one of the transmission and reception in the single serving cell.

[0153] The aforementioned multiple carriers may include one or more bands for time-division duplexing (TDD), multiple bands for frequency-division duplexing (FDD), or a combination of one or more bands for TDD and one or more bands for FDD.

[0154] Time resources for uplink and downlink may be set for at least one of the aforementioned multiple carriers.

[0155] The control unit 210 may use one or more active downlink bandwidth portions (BWPs) that span multiple downlink carriers within the multiple carriers.

[0156] The control unit 210 may use multiple carriers for initial access. The transmitting / receiving unit 220 may receive a synchronization signal and at least one broadcast channel on at least one of the multiple carriers.

[0157] The aforementioned multiple carriers may include one or more bands for time-division duplexing (TDD), multiple bands for frequency-division duplexing (FDD), or a combination of one or more bands for TDD and one or more bands for FDD.

[0158] The transmitting / receiving unit 220 may receive an initial system information block that includes an instruction for the initial uplink bandwidth portion.

[0159] The carrier for receiving at least one of the first system information block and the physical downlink control channel for scheduling the first system information block may be different from the carrier used for receiving the synchronization signal.

[0160] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. 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 using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0161] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, 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 assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0162] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 12 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0163] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0164] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0165] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0166] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0167] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0168] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0169] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0170] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0171] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0172] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0173] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0174] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0175] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0176] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0177] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0178] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0179] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0180] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0181] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0182] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0183] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0184] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0185] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0186] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0187] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0188] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0189] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0190] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0191] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0192] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0193] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0194] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0195] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0196] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. 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 voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0197] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0198] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0199] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0200] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0201] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not providing notification of the specified information or by providing notification of other information).

[0202] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0203] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0204] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0205] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0206] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0207] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0208] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0209] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0210] A mobile station may also be called 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 appropriate term.

[0211] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a moving object, the moving object itself, etc.

[0212] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0213] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0214] Figure 13 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0215] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0216] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0217] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0218] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0219] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0220] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0221] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0222] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0223] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0224] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0225] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0226] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0227] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0228] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0229] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0230] Each aspect / embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (where x is, for example, an integer or decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0231] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0232] Any reference to elements using the designations “first,” “second,” etc., as 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 way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0233] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0234] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0235] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0236] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0237] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0238] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0239] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0240] In this 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 "combine" may be interpreted similarly to "different."

[0241] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0242] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0243] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A transmitting unit that transmits capability information indicating that it supports the use of multiple carriers in a single serving cell, The serving cell comprises a control unit that controls at least one of transmission and reception, The aforementioned multiple carriers include multiple DL carriers having different center frequencies within a single time-division duplex (TDD) band, and one UL carrier. A terminal that is given a sequence of indices as frequency indices used for scheduling, for frequency resources that are combinations of multiple downlink bandwidth portions (BWP) spanning multiple DL carriers.

2. The terminal according to claim 1, wherein time resources are set for at least one of the multiple carriers.

3. A step of transmitting capability information indicating support for using multiple carriers in a single serving cell, The step of controlling at least one of transmission and reception in one of the serving cells, The aforementioned multiple carriers include multiple DL carriers having different center frequencies within a single time-division duplex (TDD) band, and one UL carrier. A wireless communication method for a terminal, wherein a series of indices are assigned as frequency indices used for scheduling to frequency resources of a combination of multiple downlink bandwidth portions (BWP) spanning multiple DL carriers.

4. A receiving unit that receives capability information indicating that it supports the use of multiple carriers in a single serving cell, The serving cell comprises a control unit that controls at least one of transmission and reception, The aforementioned multiple carriers include multiple DL carriers having different center frequencies within a single time-division duplex (TDD) band, and one UL carrier. A base station is provided with a sequence of indices as frequency indices used for scheduling, for the frequency resources of a combination of multiple downlink bandwidth portions (BWP) spanning multiple DL carriers.

5. A system comprising the terminal described in claim 1 and a base station, The base station is a system having a receiving unit that receives the capability information.

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