Terminal, wireless communication method, base station and system

Abstract

A transmitting device according to an aspect of the present disclosure includes a control unit that controls transmission of the channel in at least one of a plurality of consecutive bands provided within the carrier based on a result of listening to each of the bands provided within the carrier.

Description

[Technical field]

[0001] The present invention relates to a next-generation mobile communication system. Terminal, Wireless communication method , base station and system Regarding. [Background technology]

[0002] Long Term Evolution (LTE) was specified for the Universal Mobile Telecommunications System (UMTS) network with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, in order to achieve even wider bandwidth and higher speeds than LTE, successor systems to LTE (e.g., LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G+ (plus), NR (New RAT), 3GPP (3 rd The New Generation Partnership Project (also known as Rel. 14, 15, 16, etc.) is also under consideration.

[0003] In existing LTE systems (e.g., Rel. 8-12), specifications have been developed on the assumption that operators will operate exclusively in frequency bands (also called licensed bands, licensed carriers, licensed component carriers (CCs) etc.) licensed to them. Licensed CCs include, for example, 800 MHz, 1.7 GHz, and 2 GHz.

[0004] Furthermore, in order to expand the frequency band, existing LTE systems (e.g., Rel. 13) support the use of frequency bands (also called unlicensed bands, unlicensed carriers, or unlicensed CCs) different from the licensed bands. Assumed unlicensed bands include, for example, the 2.4 GHz band and 5 GHz band in which Wi-Fi (registered trademark) and Bluetooth (registered trademark) can be used.

[0005] Specifically, Rel.13 supports carrier aggregation (CA) that integrates licensed band carriers (CC) and unlicensed band carriers (CC). This communication using both licensed and unlicensed bands is called License-Assisted Access (LAA).

[0006] The use of LAA is also being considered for future wireless communication systems (e.g., 5G, 5G+, NR, Rel. 15 and later). In the future, dual connectivity (DC) between licensed and unlicensed bands and stand-alone (SA) of unlicensed bands may also be considered for LAA. [Prior art documents] [Non-patent literature]

[0007] [Non-Patent Document 1] 3GPP TS 36.300 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2” Summary of the Invention [Problem to be solved by the invention]

[0008] Since the unlicensed carrier is a band shared by multiple operators, before transmitting a signal, listening is performed to check whether other devices (e.g., base stations, user terminals, Wi-Fi (registered trademark) devices, etc.) are transmitting. Listening is also called LBT: Listen Before Talk, CCA: Clear Channel Assessment, carrier sense, or channel access procedure.

[0009] In future wireless communication systems (hereinafter, also referred to as NR, etc.), it is expected that carriers (also referred to as wideband carriers, etc.) with a bandwidth wider than a predetermined bandwidth (for example, 20 MHz) will be used as unlicensed carriers. For this reason, in NR, listening for each predetermined band (also referred to as LBT subbands, etc.) within the carrier is also being considered.

[0010] However, when listening is performed for each predetermined band within a carrier, there is a risk that transmission of a channel (e.g., a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) or an uplink shared channel (Physical Uplink Shared Channel (PUSCH))) cannot be appropriately controlled.

[0011] The present invention has been made in view of the above points, and provides a method for appropriately controlling the transmission of a channel when listening to each predetermined band within a carrier. Terminal, Wireless communication method , base station and system One of the aims is to provide. [Means for solving the problem]

[0012] A terminal according to one aspect of the present invention includes a transmitter that transmits an uplink channel in a License-Assisted Access SCell (LAA SCell), and a controller that performs a channel access operation in each of a plurality of consecutive bands set in a carrier, and controls transmission of the uplink channel in the plurality of consecutive bands when channel access is successful in all of the bands, and a guard band is provided regardless of whether channel access is successful in each of the bands. Fixedly It is characterized in that it is set. Effect of the Invention

[0013] According to the present invention, when listening is performed for each predetermined band within a carrier, the transmission of the channel can be appropriately controlled. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing an example of a wideband carrier used in NR-U. [Diagram 2] FIG. 2 is a diagram illustrating an example of a first transmission control of channels in consecutive LBT subbands according to the first aspect. [Diagram 3] FIG. 3 is a diagram illustrating an example of a second transmission control of channels in consecutive LBT subbands according to the first aspect. [Figure 4] FIG. 4 is a diagram illustrating an example of transmission control of channels in consecutive LBT subbands according to the second embodiment. [Diagram 5] FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 6] FIG. 6 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 7] FIG. 7 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 8] FIG. 8 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] In NR, the use of unlicensed carriers (carriers in unlicensed bands) as well as licensed carriers (carriers in licensed bands) for communications is being considered. A licensed carrier is a carrier with frequencies exclusively assigned to a single operator. An unlicensed carrier is a carrier with frequencies shared between multiple operators, RATs, etc.

[0016] The licensed carrier is also called a component carrier (CC), a cell, a primary cell (PCell), a secondary cell (SCell), a primary secondary cell (PSCell), etc. In addition, the unlicensed carrier is also called NR-Unlicensed (NR-U), a CC, an unlicensed CC, a cell, a License-Assisted Access SCell (LAA SCell), etc.

[0017] In a system that operates NR etc. on an unlicensed carrier (for example, an LAA (Licensed Assisted Access) system), interference control functions are considered to be necessary in order to coexist with other operators' NR or LTE, wireless LAN (Local Area Network) or other systems. Note that the operation form of an LAA system may be dual connectivity (DC) with a licensed carrier, carrier aggregation (CA) or standalone (SA), and may be called LAA, NR-U, etc.

[0018] Generally, a transmission point (e.g., a base station (gNodeB (gNB) or eNodeB (eNB)), a user terminal (User Equipment (UE)), etc.) that communicates using an unlicensed carrier is prohibited from transmitting on that carrier if it detects another entity (e.g., another UE) communicating on that unlicensed carrier.

[0019] For this reason, the transmission point executes listening (LBT) at a timing a predetermined period before the transmission timing. Specifically, the transmission point executing LBT searches a target band (e.g., one component carrier (CC)) at a timing (e.g., the immediately preceding subframe) a predetermined period before the transmission timing, and checks whether other devices (e.g., a base station, a UE, a Wi-Fi device, etc.) are communicating in the band.

[0020] In this specification, listening refers to an operation of detecting / measuring whether or not a signal exceeding a predetermined level (e.g., a predetermined power) is being transmitted from another transmission point or the like before a certain transmission point (e.g., a base station, a user terminal, etc.) transmits a signal. In addition, listening performed by a transmission point is also called LBT (Listen Before Talk), CCA (Clear Channel Assessment), carrier sense, channel access procedure, etc. In addition, an access method with collision control (also called Receiver assisted access, Receiver assisted LBT, etc.) may be applied in an unlicensed carrier.

[0021] When the transmission point can confirm that no other devices are communicating, it transmits using that carrier. For example, when the received power measured by listening is equal to or less than a predetermined threshold, the transmission point determines that the channel is free and transmits. In other words, "the channel is free" means that the channel is not occupied by a specific system, and is also called the channel being idle, the channel being clear, the channel being free, listening being successful, etc.

[0022] On the other hand, if a transmission point detects that some of the target carrier bands are being used by other devices, it halts its own transmission process. For example, if a transmission point detects that the received power of a signal from another device related to that band exceeds a predetermined threshold, it determines that the channel is busy and does not transmit. If the channel is busy, it can be used only after listening to the channel again and confirming that it is free. Note that the method of determining whether a channel is free / busy using LBT is not limited to this.

[0023] As described above, in NR-U, by introducing interference control within the same frequency based on the LBT mechanism to the transmission point, it is possible to avoid interference between LAA and Wi-Fi, interference between LAA systems, etc. Furthermore, even if each operator that operates an LAA system independently controls the transmission point, interference can be reduced by LBT without knowing the control contents of each system.

[0024] In NR-U, it is expected that a carrier (also called a wideband carrier, wideband, LAAS cell, LAA cell, NR-U carrier, NR-U cell, cell, etc.) with a bandwidth wider than a specified bandwidth (e.g., 20 MHz) will be used.

[0025] In the case of a wideband carrier, listening is being considered for each partial band within the carrier, rather than the entire carrier. The partial band is also called a predetermined band, a sub-band, an LBT sub-band, etc.

[0026] Fig. 1 is a diagram showing an example of a wideband carrier used in NR-U. As shown in Fig. 1, the wideband carrier may be configured to include a plurality of LBT subbands. At least one end of each LBT subband may be provided with a guard band (also called a guard region, etc.).

[0027] In Fig. 1, a transmission point (e.g., a UE or a base station) may perform an LBT for each LBT subband. The transmission point may control transmission of a channel (also called a subchannel) in each LBT subband according to the LBT result in each LBT subband. The subchannel may be, for example, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) or an uplink shared channel (Physical Uplink Shared Channel (PUSCH)).

[0028] It is also contemplated that a transmission point may transmit the above subchannel across multiple contiguous or non-contiguous LBT subbands within a wideband carrier.

[0029] In addition, in the downlink (DL), the following options are being considered as control operations for PDSCH transmission on a bandwidth part (BWP) basis within the wideband carrier. (1a) When multiple BWPs are configured and multiple BWPs are activated within a wideband carrier, transmit the PDSCH in one or more BWPs. (1b) When multiple BWPs are configured within a wideband carrier and multiple BWPs are activated, the PDSCH shall be transmitted in a single BWP. (2) If multiple BWPs are configured within a wideband carrier and a single BWP is activated, the base station shall transmit PDSCH in the single BWP if CCA is uccessful for the whole BWP. (3) When multiple BWPs are configured within a wideband carrier and a single BWP is activated, transmitting a PDSCH in at least a portion of the BWPs in which CCA in the base station is successful.

[0030] In addition, in the uplink (UL), the following options are being considered as control operations for transmitting PUSCH on a BWP basis within the wideband carrier. (1a) When multiple BWPs are configured within a wideband carrier and multiple BWPs are activated, transmit PUSCH in one or more BWPs. (1b) When multiple BWPs are configured within a wideband carrier and multiple BWPs are activated, the PUSCH shall be transmitted in a single BWP. (2) If multiple BWPs are configured within a wideband carrier and a single BWP is activated, the UE shall transmit PUSCH in the single BWP if CCA is uccessful for the whole BWP. (3) When multiple BWPs are configured within a wideband carrier and a single BWP is activated, transmitting a PUSCH in at least some of the BWPs in which CCA in the UE is successful.

[0031] CCA (LBT) may be declared successful or not in multiples of 20 MHz. The CCA may be LBT performed per LBT subband (see FIG. 1). In this case, the bandwidth of each LBT subband may be a multiple of 20 MHz.

[0032] At least one of the position and bandwidth of each LBT subband in the wideband carrier may be the same as or different from the BWP. For example, one or more LBT subbands may be provided in the BWP.

[0033] In addition, in a wideband carrier, the LBT subband and the BWP may be set separately (independently) or may be set in common. In a wideband carrier, at least a part of the LBT subband and the BWP may or may not overlap.

[0034] As described above, in at least one of the DL and UL of NR, dynamic use of available bandwidth depending on the results of CCA (LBT) (e.g., the LBT results for each LBT subband), as exemplified by option (3) above, is being considered.

[0035] On the other hand, as described above, it is also considered that the transmission point transmits a channel (for example, PDSCH or PUSCH) across multiple consecutive LBT subbands in a wideband carrier. However, when performing LBT for each LBT subband, it is not always possible that the LBT for each of the multiple LBT subbands is successful, and it is also possible that only the LBT for some of the LBT subbands is successful.

[0036] Therefore, the problem is how to control the transmission of channels in a plurality of consecutive LBT subbands according to the LBT result for each LBT subband. For example, as shown in FIG. 1, when a guard band is provided at least at one end of each LBT subband, the problem is how to utilize the guard band.

[0037] Therefore, the present inventors have investigated a method for appropriately controlling the transmission of a channel in at least one of a plurality of consecutive LBT subbands in accordance with the LBT result for each LBT subband, and have arrived at the present invention.

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Each aspect of the embodiment may be applied alone or in combination.

[0039] In this embodiment, the "transmission point (transmitting device)" is, for example, at least one of a base station and a UE. When the transmission point is a base station, the "channel" may be at least one of a DL channel (for example, a PDSCH) and a DL signal. When the transmission point is a UE, the "channel" may be at least one of a UL channel (for example, a PUSCH) and a UL signal.

[0040] In addition, in this embodiment, the terms "channel", "signal", "data", and "sub-channel" may be interchanged. In addition, in this embodiment, the terms "sub-channel" and "LBT sub-band" may be interchanged.

[0041] (First aspect) In a first aspect, a transmission point controls transmission of a channel in each of a plurality of LBT subbands that are consecutive in frequency direction within a wideband carrier according to a listening result for each of the plurality of LBT subbands.

[0042] Specifically, the transmission point may transmit a channel on each LBT subband that it successfully listens on if it successfully listens on at least one of the consecutive LBT subbands.

[0043] On the other hand, if the transmission point is not successful in listening on at least one of the consecutive LBT subbands, the transmission point may cease transmitting the channel on each LBT subband that it fails to listen on.

[0044] A guard band may be provided between a plurality of consecutive subbands in which listening is successful (first transmission control), or a guard band may not be provided (second transmission control).

[0045] <First transmission control> Fig. 2 is a diagram showing an example of a first transmission control of channels in consecutive LBT subbands according to the first aspect. For example, Fig. 2 shows an example in which two consecutive LBT subbands #0 and #1 are provided in a wideband carrier in the frequency direction. Note that the arrangement of the LBT subbands in Fig. 2 is merely an example and is not limited to the one shown in the figure.

[0046] In Fig. 2, the transmission point may perform LBT for each LBT subband in the wideband carrier. Specifically, the transmission point may control the transmission of channels in each of the consecutive LBT subbands #0 and #1 based on the listening results in each of the consecutive LBT subbands #0 and #1.

[0047] For example, as shown in FIG. 2, if listening is successful on all consecutive LBT subbands #0 and #1, the transmission point may transmit a channel (data Tx) on each of the consecutive LBT subbands #0 and #1.

[0048] On the other hand, if listening is successful on some LBT subbands #0 of consecutive LBT subbands #0 and #1, but listening fails on the remaining LBT subbands #1, the transmission point may transmit a channel on the LBT subband #0 that was successfully listened to, while canceling (or not transmitting) the channel on the LBT subband #1 that was unsuccessful in listening.

[0049] In Fig. 2, guard bands may be provided at both ends of each LBT subband in the wideband carrier. As shown in Fig. 2, the guard bands in each LBT subband may not be assigned channels (or may not be transmitted), regardless of whether listening is successful on consecutive LBT subbands #0 and #1.

[0050] That is, in FIG. 2, even if listening is successful in consecutive LBT subbands #0 and #1, no channel is assigned to the guard band provided in the area adjacent to LBT subbands #0 and #1.

[0051] In Fig. 2, the guard band is fixedly provided regardless of whether listening is successful in consecutive LBT subbands, so there is no need to change the channel allocation area depending on whether listening is successful in the consecutive LBT subbands. Therefore, the amount of processing required to change the transmission signal instantaneously according to the listening result of each LBT subband can be suppressed.

[0052] <Second transmission control> Fig. 3 is a diagram showing an example of a second transmission control of channels in consecutive LBT subbands according to the first embodiment. Fig. 3 is different from Fig. 2 in that allocation of channels (data Tx) to at least some guard bands of each LBT subband is controlled depending on whether listening is successful in the consecutive LBT subbands.

[0053] In Fig. 3, the transmission point may perform LBT for each LBT subband in the wideband carrier. Specifically, the transmission point may control the transmission of channels in each of the consecutive LBT subbands #0 and #1 based on the listening results in each of the consecutive LBT subbands #0 and #1.

[0054] For example, as shown in FIG. 3, if listening is successful on all consecutive LBT subbands #0 and #1, the transmission point may transmit a channel on each of the consecutive LBT subbands #0 and #1.

[0055] On the other hand, if listening is successful on some LBT subbands #0 of consecutive LBT subbands #0 and #1, but listening fails on the remaining LBT subbands #1, the transmission point may transmit a channel on the LBT subband #0 that was successfully listened to, while canceling (or not transmitting) the channel on the LBT subband #1 that was unsuccessful in listening.

[0056] In Fig. 3, guard bands may be provided at both ends of each LBT subband in the wideband carrier. As shown in Fig. 3, in at least some of the guard bands in each LBT subband, channel (data Tx) allocation (transmission) may be controlled based on whether listening is successful in consecutive LBT subbands #0 and #1.

[0057] For example, in FIG. 3, when listening is successful in consecutive LBT subbands #0 and #1, a channel is assigned to (a resource region corresponding to) the guard band provided in the region adjacent to LBT subbands #0 and #1.

[0058] In this case, at least a part of the data Tx1 transmitted in the LBT subband #0 may be copied to the guard band adjacent to the LBT subband #1 in the LBT subband #0. On the other hand, at least a part of the data Tx2 transmitted in the LBT subband #1 may be copied to the guard band adjacent to the LBT subband #0 in the LBT subband #1. In this way, the guard bands adjacent between the LBT subbands #0 and #1 may be used for data redundancy.

[0059] In each of the LBT subbands #0 and #1, at least a portion (channel) of the data Tx1 and Tx2 is not allocated to the guard bands provided in regions that are not adjacent to each other, and may not be used as the guard bands.

[0060] 3, when listening is successful in a part of the consecutive LBT subbands #0 and #1, the regions at both ends of the LBT subband #0 where listening is successful may be used as guard bands (channels may not be assigned to the regions at both ends). That is, channels are not assigned to the guard bands provided in the regions adjacent to the LBT subband #1 in order to prevent interference from other systems using the LBT subband #1.

[0061] In Fig. 3, when listening is successful in all consecutive LBT subbands, redundancy can be achieved by copying at least a part of the data to the guard bands in the adjacent areas of the LBT subbands, so that the reliability of the transmitted data can be improved when consecutive LBT subbands can be used. In addition, the amount of processing required to change the transmitted signal instantaneously according to the listening results for each LBT subband can be reduced.

[0062] As described above, in the first aspect, even if a plurality of consecutive LBT subbands are provided in the frequency direction in a wideband carrier, the transmission of the channel in each of the plurality of LBT subbands is controlled according to the listening result for each LBT subband. Therefore, the transmission of the channel in each LBT subband can be flexibly controlled.

[0063] (Second aspect) In a second aspect, a transmission point controls transmission of channels in a plurality of LBT subbands that are consecutive in frequency direction within a wideband carrier according to a listening result across the plurality of LBT subbands.

[0064] Specifically, a transmission point may transmit a channel in the consecutive LBT subbands if it is successful in listening on all of the consecutive LBT subbands, whereas a transmission point may stop transmitting a channel in the entire consecutive LBT subbands if it is unsuccessful in listening on some of the consecutive LBT subbands.

[0065] Fig. 4 is a diagram showing an example of transmission control of channels in consecutive LBT subbands according to the second aspect. For example, Fig. 4 shows an example in which two consecutive LBT subbands #0 and #1 are provided in a wideband carrier, and one LBT subband #2 that is not consecutive (discontinuous) to the LBT subbands #0 or #1 is provided. Note that the arrangement of the LBT subbands in Fig. 4 is merely an example, and is not limited to the one shown in the figure.

[0066] In Fig. 4, the transmission point may perform LBT for each LBT subband in the wideband carrier. Specifically, the transmission point may control the transmission of channels in consecutive LBT subbands #0 and #1 based on whether listening is successful in all of the consecutive LBT subbands #0 and #1.

[0067] For example, as shown in FIG. 4, if listening is successful on all consecutive LBT subbands #0 and #1, the transmission point may transmit a channel (data Tx) that is allocated across consecutive LBT subbands #0 and #1.

[0068] The channel may be allocated and transmitted without providing a guard band between LBT subbands #0 and #1. On the other hand, in each of LBT subbands #0 and #1, a guard band may be provided in an edge region that is not adjacent to another LBT subband.

[0069] On the other hand, as shown in FIG. 4, if listening is successful in part of consecutive LBT subbands #0 and #1 (for example, in FIG. 4, LBT is successful in LBT subband #0 but fails in LBT subband #1), the transmission point may stop transmitting the channel across consecutive LBT subbands #0 and #1.

[0070] In addition, for a single LBT subband #2 that is not contiguous with LBT subbands #0 or #1, the transmission point may control the transmission of a channel in the LBT subband #2 based on whether listening in the LBT subband #2 is successful.

[0071] For example, as shown in FIG. 4, if the LBT in LBT subband #2 fails, the transmission point may stop transmitting the channel in LBT subband #2, and if the LBT in LBT subband #2 is successful, the transmission point may transmit the channel in LBT subband #2.

[0072] In this way, in the second aspect, the transmission point listens to each LBT subband in the wideband carrier, and when listening is successful in all of the consecutive LBT subbands, the transmission point can transmit a channel using the consecutive LBT subbands without providing a guard band between the consecutive LBT subbands. Therefore, when consecutive LBT subbands can be used, the frequency utilization efficiency can be improved.

[0073] In the second aspect, even if listening to only a part of a plurality of consecutive LBT subbands is successful, the transmission point stops transmitting the channel using the plurality of consecutive LBT subbands and does not transmit the channel in the part of the LBT subbands. This makes it possible to suppress the amount of processing required to change the transmission signal instantaneously according to the results of listening to the plurality of consecutive LBT subbands.

[0074] (Other aspects) At least a part of the first aspect and the second aspect may be combined, or may be used alone. For example, the LBT subband illustrated in FIG. 2 or FIG. 3 and the LBT subband illustrated in FIG. 4 may be mixed in the same wideband carrier. Also, the LBT subband illustrated in FIG. 2 to FIG. 4 may be mixed in the same wideband carrier.

[0075] (Wireless communication system) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0076] 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to an 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), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0077] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of 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 the like.

[0078] 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.

[0079] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0080] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0081] 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).

[0082] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the 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 correspond to a frequency band higher than FR2.

[0083] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0084] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0085] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0086] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0087] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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.

[0088] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0089] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0090] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0091] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0092] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0093] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0094] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0095] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0096] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0097] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0098] 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 the 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.

[0099] 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 the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0100] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0101] (base station) 6 is a diagram showing an example of the configuration of a base station according to an 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 the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0102] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0103] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0104] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0105] The transceiver 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 transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0106] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0107] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0108] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0109] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0110] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0111] The transceiver 120 (transmission processing unit 1211) may perform transmission processing 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 on the bit string to be transmitted, and output a baseband signal.

[0112] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0113] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0114] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0115] The transceiver 120 (measurement unit 123) may perform measurements on 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 measure received power (e.g., Reference Signal Received Power (RSRP)), received 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.

[0116] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0117] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0118] The transceiver 120 may transmit a channel (for example, a PDSCH, also called a DL channel, a DL signal, or data).

[0119] The control unit 110 may control transmission of the channel in at least one of a plurality of consecutive bands provided within the carrier, based on the result of listening for each band (LBT sub-band) provided within the carrier.

[0120] Furthermore, the control unit 110 may control the transmission of the channels allocated across the plurality of consecutive bands, based on whether or not listening is successful in all of the plurality of consecutive bands (second embodiment).

[0121] Furthermore, the control unit 110 may control the transmission of the channel in each of the plurality of consecutive bands based on whether or not listening is successful in each of the plurality of consecutive bands (first embodiment).

[0122] In addition, the control unit 110 may stop allocating the channel to the guard bands provided in each of the multiple consecutive bands, regardless of whether listening is successful in all of the multiple consecutive bands (first transmission control of the first aspect).

[0123] In addition, the control unit 110 may control the allocation of the channels to at least one guard band provided in each of the multiple consecutive bands based on whether listening is successful in all of the multiple consecutive bands (second transmission control of the first aspect).

[0124] (User terminal) 7 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0125] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0126] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0127] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0128] 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 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0129] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0130] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0131] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0132] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0133] The transceiver 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, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0134] The transceiver 220 (transmission processing unit 2211) may perform transmission processing 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 on the bit sequence to be transmitted, and output a baseband signal.

[0135] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0136] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0137] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0138] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0139] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may 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.

[0140] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220, the transmitting / receiving antenna 230, and the transmission path interface 240.

[0141] The transceiver 220 may transmit a channel (eg, PUSCH, also called an UL channel, UL signal, data, etc.).

[0142] The control unit 210 may control transmission of the channel in at least one of a plurality of consecutive bands provided within the carrier, based on the result of listening for each band (LBT sub-band) provided within the carrier.

[0143] Furthermore, the control unit 210 may control the transmission of the channels allocated across the plurality of consecutive bands based on whether or not listening is successful in all of the plurality of consecutive bands (second embodiment).

[0144] Furthermore, the control unit 210 may control the transmission of the channel in each of the plurality of consecutive bands based on whether or not listening is successful in each of the plurality of consecutive bands (first aspect).

[0145] In addition, the control unit 210 may stop allocating the channel to the guard bands provided in each of the multiple consecutive bands, regardless of whether listening is successful in all of the multiple consecutive bands (first transmission control of the first aspect).

[0146] In addition, the control unit 210 may control the allocation of the channels to at least one guard band provided in each of the multiple consecutive bands based on whether listening is successful in all of the multiple consecutive bands (second transmission control of the first aspect).

[0147] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0148] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0149] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 8 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0150] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0151] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0152] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0153] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0154] Moreover, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to the programs. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0155] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0156] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile 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 referred to as an auxiliary storage device.

[0157] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0158] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0159] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0160] 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), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0161] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0162] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0163] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0164] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0165] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0166] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0167] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0168] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0169] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0170] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0171] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0172] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0173] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0174] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0175] In addition, one or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0176] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0177] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0178] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0179] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0180] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

[0181] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0182] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0183] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0184] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0185] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0186] The notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0187] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0188] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0189] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0190] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0191] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0192] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0193] 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," "panel," and the like may be used interchangeably.

[0194] In this disclosure, terms such as "Base Station (BS)", "radio 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", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0195] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0196] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0197] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0198] 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 be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0199] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0200] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0201] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0202] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0203] Each aspect / embodiment described in the present disclosure may be applied to a system using 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), 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), or other suitable wireless communication method, or a next-generation system extended based on these. In addition, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0204] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0205] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must precede the second element in some way.

[0206] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0207] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0208] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0209] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0210] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0211] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0212] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0213] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0214] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0215] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0216] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

[0217] This application is based on Japanese Patent Application No. 2019-022055, filed on January 23, 2019, the contents of which are incorporated herein in their entirety.

Claims

1. A transmitter for transmitting an uplink channel in a License-Assisted Access SCell (LAA SCell); a control unit that performs a channel access operation in each of a plurality of consecutive bands set in a carrier, and controls transmission of the uplink channel in the plurality of consecutive bands when channel access is successful in all of the bands; A terminal in which a guard band is fixedly set regardless of whether channel access is successful in each of the bands.

2. 2. The terminal according to claim 1, wherein each of the bands is composed of a plurality of resource blocks (RBs).

3. transmitting an uplink channel in a License-Assisted Access SCell (LAA SCell); performing a channel access operation in each of a plurality of consecutive bands set in a carrier, and controlling transmission of the uplink channel in the plurality of consecutive bands when the channel access is successful in all of the bands; A wireless communication method for a terminal, comprising the steps of: setting a fixed guard band in each of said bands regardless of whether channel access is successful or not.

4. A transmitter for transmitting a downlink channel in a License-Assisted Access SCell (LAA SCell); a control unit that performs a channel access operation in each of a plurality of consecutive bands set in a carrier, and controls transmission of the downlink channel in each of the plurality of consecutive bands based on whether or not the channel access in each of the bands is successful; A base station, characterized in that a guard band is fixedly set in each of said bands regardless of whether channel access is successful or not.

5. A system having a terminal and a base station, The terminal includes a transmitter that transmits an uplink channel in a License-Assisted Access SCell (LAA SCell); a control unit that performs a channel access operation in each of a plurality of consecutive bands set in a carrier, and controls transmission of the uplink channel in the plurality of consecutive bands when channel access is successful in all of the bands; The base station includes a transmitter for transmitting a downlink channel in the LAA SCell; a control unit that performs a channel access operation in each of the plurality of consecutive bands, and controls transmission of the downlink channel in each of the plurality of consecutive bands based on whether or not the channel access is successful in each of the plurality of consecutive bands; A system comprising: a guard band that is fixedly set regardless of whether channel access is successful in each of the bands.

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