Terminal, wireless communication method, base station, and system

Abstract

A terminal according to an aspect of the present disclosure comprises: a reception unit that receives a list of transmission setting instructions (TCI) applicable to a downlink and an uplink; and a control unit that determines one or more sets of active TCI states from the list on the basis of one or more medium control-control elements (MAC CE), and determines one or more TCI states to be applied to at least one of downlink and uplink signals from the one or more sets on the basis of downlink control information (DCI). According to this aspect of the present disclosure, the TCI states can be appropriately controlled.

Description

Technical Field

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

Background Art

[0002] In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) was standardized for the purpose of further high 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 standardized.

[0003] A successor system 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.) is also under consideration.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a future wireless communication system (e.g., NR), a user terminal (terminal, user terminal, User Equipment (UE)) is considered to control transmission and reception processing based on information related to Quasi-Co-Location (QCL) (QCL assumption / Transmission Configuration Indication (TCI) state / spatial relationship).

[0006] However, there are cases where information related to QCL is not clear. If the information related to QCL is not clear, there is a risk of causing a decrease in communication quality, a decrease in throughput, etc.

[0007] Therefore, one object of the present disclosure is to provide a terminal and a wireless communication method that appropriately determine a TCI state 、 base station and system as one of the purposes.

Means for Solving the Problems

[0008] A terminal according to an aspect of the present disclosure includes a receiving unit that receives a list of unified transmission configuration indication (TCI) states applicable to a downlink and an uplink, and based on a medium access control-control element (MAC CE), determines an active TCI state from the list, and based on downlink control information (DCI) that schedules a downlink shared channel (PDSCH), determines a TCI state applied to the downlink and the uplink from the active TCI state, and a control unit a transmitter that transmits HARQ-ACK information for the DCI when the receiver receives the DCI indicating a certain TCI state, and the control unit updates the TCI state after a certain waiting time from the transmission of the HARQ-ACK information .

Effects of the Invention

[0009] According to an aspect of the present disclosure, a TCI state can be appropriately determined.

Brief Description of the Drawings

[0010]

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[0011] (TCI, Spatial Relationship, QCL) In NR, it is considered to control at least one of signal and channel (expressed as signal / channel) in a UE, such as reception processing (e.g., at least one of reception, demapping, demodulation, decoding), transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, encoding), based on a Transmission Configuration Indication state (TCI state).

[0012] The TCI state may represent what is applied to the downlink signal / channel. What corresponds to the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

[0013] The TCI state is information regarding the Quasi-Co-Location (QCL) of a signal / channel, and may be referred to as a spatial reception parameter, Spatial Relation Information, etc. The TCI state may be set for each UE for each channel or each signal.

[0014] QCL is an indicator showing the statistical properties of a signal / channel. For example, when a certain signal / channel and another signal / channel are in a QCL relationship, it may mean that at least one of Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (for example, spatial Rx parameter) is the same (QCL for at least one of these) among these different multiple signals / channels.

[0015] Note that the spatial reception parameter may correspond to the reception beam of the UE (for example, reception analog beam), and the beam may be specified based on spatial QCL. QCL (or at least one element of QCL) in the present disclosure may be read as sQCL (spatial QCL).

[0016] Multiple types (QCL types) of QCL may be defined. For example, four QCL types A - D may be provided where the parameters (or parameter sets) that can be assumed to be the same are different, and the parameters (which may also be referred to as QCL parameters) are shown below: · QCL type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread, · QCL type B (QCL-B): Doppler shift and Doppler spread, · QCL type C (QCL-C): Doppler shift and average delay, · QCL type D (QCL-D): Spatial reception parameters.

[0017] It may be called a QCL assumption that a UE assumes that a certain control resource set (Control Resource Set (CORESET)), channel, or reference signal is in a relationship with another CORESET, channel, or reference signal and a specific QCL (for example, QCL type D).

[0018] The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0019] The TCI state may be, for example, information regarding the QCL between a target channel (in other words, a reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another RS). The TCI state may be set (indicated) by upper layer signaling, physical layer signaling, or a combination thereof.

[0020] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0021] The channel for which the TCI state or spatial relation is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0022] Also, the RS having a QCL relation with the channel may be, for example, at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a CSI-RS for tracking (also called Tracking Reference Signal (TRS)), and a reference signal for QCL detection (also called QRS).

[0023] The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a physical broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be called an SS / PBCH block.

[0024] The RS of QCL type X in the TCI state may mean an RS having a QCL type X relation with a certain channel / signal (DMRS of the channel / signal), and this RS may also be called the QCL source of QCL type X in the TCI state.

[0025] (Unified TCI framework) Using the same TCI state for both the UL channel and the DL channel is under consideration.

[0026] In the example of FIG. 1, the TCI state including DL-RS is used for the QCL assumption of PDCCH / PDSCH / CSI-RS, the spatial relationship of SRS / PUCCH, and the spatial relationship of PUSCH.

[0027] Using RRC / MAC-CE / DCI for the selection of one TCI state for UL / DL is under consideration.

[0028] In the example of FIG. 2, a plurality of unified TCI states for DL are set by RRC, and a plurality of unified TCI states for UL are set by RRC. Each of the plurality of unified TCI states for DL and the plurality of unified TCI states for UL may be an SSB, a CSI-RS, or an SRS.

[0029] A part of the unified TCI state for DL set by RRC is activated as the unified TCI state for DL by MAC CE. A part of the unified TCI state for DL set by RRC is activated as the unified TCI state for UL by MAC CE. A part of the unified TCI state for UL set by RRC is activated as the unified TCI state for UL by MAC CE. A part of the unified TCI state for DL activated by MAC CE is indicated by DCI. A part of the unified TCI state for UL activated by MAC CE is indicated by DCI.

[0030] However, it is not clear how to set / activate / indicate the TCI state. If the determination method of the TCI state is not clear, there is a risk of causing a decrease in communication quality, a decrease in throughput, etc.

[0031] Therefore, the inventors have conceived a method for determining the TCI state.

[0032] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to the respective embodiments may be applied individually or in combination.

[0033] In the present disclosure, "A / B / C", "at least one of A, B, and C" may be read interchangeably. In the present disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, band may be read interchangeably. In the present disclosure, index, ID, indicator, resource ID may be read interchangeably. In the present disclosure, support, control, be able to control, operate, be able to operate may be read interchangeably.

[0034] In the present disclosure, configure, activate, update, indicate, enable, specify, select may be read interchangeably.

[0035] In the present disclosure, MAC CE, activation / deactivation command may be read interchangeably.

[0036] In the present disclosure, the upper layer signaling may be any one of, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameter, upper layer parameter, RRC information element (IE), RRC message may be read interchangeably.

[0037] MAC signaling may use, for example, a MAC control element (MAC CE), a MAC Protocol Data Unit (PDU), etc. Broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0038] In the present disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, QCL assumption, QCL parameter, spatial domain reception filter, UE spatial domain reception filter, UE reception beam, DL beam, DL reception beam, DL precoding, DL precoder, DL-RS, RS of QCL type D for TCI state / QCL assumption, RS of QCL type A for TCI state / QCL assumption, spatial relationship, spatial domain transmission filter, UE spatial domain transmission filter, UE transmission beam, UL beam, UL transmission beam, UL precoding, UL precoder, PL-RS may be read as each other. In the present disclosure, QCL type X-RS, DL-RS associated with QCL type X, DL-RS having QCL type X, source of DL-RS, SSB, CSI-RS, SRS may be read as each other.

[0039] UL DCI, DCI for scheduling a UL channel (PUSCH), DCI format 0_x (x = 0, 1, 2,...) may be read as each other. DL DCI, DCI for scheduling a DL channel (PDSCH), DCI format 1_x (x = 0, 1, 2,...) may be read as each other.

[0040] (Wireless communication method) In the present disclosure, "pool", "set", "group", "list" may be read interchangeably with each other.

[0041] <First Embodiment> The UE may assume the same TCI state pool for both UL and DL.

[0042] RRC (parameters, information elements) may configure multiple TCI states (pools) for UL / DL channels.

[0043] The MAC CE may select (activate) one or more (e.g., multiple) TCI states (sets) for UL / DL channels.

[0044] The UL / DL DCI may select (indicate) one or more (e.g., one) TCI states. This TCI state may be applied to multiple UL / DL channels. The UL / DL channels may be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0045] The UL / DL DCI may include a new TCI field. The UL / DL DCI may be at least one of DCI formats 0_1, 0_2, 1_1, 1_2. The new TCI field may select at least one (e.g., one) of multiple active TCI states.

[0046] If the new TCI field exists within DCI formats 1_1, 1_2, the Rel.15 / 16 TCI field may not exist within DCI formats 1_1, 1_2.

[0047] The existence of a new TCI field within the DCI may be set by a higher layer. The existence of a new DCI field within the UL DCI and the existence of a new DCI field within the DL DCI may be set independently (separately). The existence of a new DCI field within the UL DCI and the existence of a new DCI field within the DL DCI may be set jointly.

[0048] The size (number of bits) of the TCI field may be the same or different in the UL DCI and the DL DCI. For example, the size of the TCI field in the DL DCI may be larger than the size of the TCI field in the UL DCI.

[0049] In the example of FIG. 3, the RRC sets a plurality of TCI states for the DL and UL. Each of the plurality of TCI states may be an SSB, a CSI-RS, or an SRS. The MAC CE activates a part of the set plurality of TCI states. The DCI indicates at least one of the activated plurality of TCI states.

[0050] The indicated TCI state is applied to a plurality of UL / DL channels. The UL / DL channel may be a PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0051] According to the above first embodiment, the TCI states set within one pool can be used for UL and DL channels.

[0052] <Second Embodiment> The UE may assume different TCI state pools for each of the UL and DL.

[0053] The RRC (parameters, information elements) may set a plurality of TCI states (pools) for each of the UL and DL channels.

[0054] The MAC CE may select (activate) one or more (e.g., a plurality of) TCI states (sets) for each of the UL and DL channels. The MAC CE may activate two sets of TCI states.

[0055] The DL DCI may select (indicate) one or more (e.g., one) TCI states. This TCI state may be applied to one or more DL channels. The DL channel may be PDCCH / PDSCH / CSI-RS.

[0056] The UL DCI selects (indicates) one or more (e.g., one) TCI states. This TCI state may be applied to one or more UL channels. The UL channel may be PUSCH / SRS / PUCCH.

[0057] The UL / DL DCI may include a new TCI field. The UL / DL DCI may be at least one of DCI formats 0_1, 0_2, 1_1, 1_2. The new TCI field may select at least one (e.g., one) of a plurality of active TCI states.

[0058] If the new TCI field exists within DCI formats 1_1, 1_2, the Rel.15 / 16 TCI field may not exist within DCI formats 1_1, 1_2. In DCI formats 1_1, 1_2, the new TCI field may not exist. The existing TCI field may be reused for the indication of the TCI state of this embodiment.

[0059] The existence of the new TCI field within the DCI may be set by the upper layer. The existence of the new DCI field within the UL DCI and the existence of the new DCI field within the DL DCI may be set independently (separately). The existence of the new DCI field within the UL DCI and the existence of the new DCI field within the DL DCI may be set jointly.

[0060] The size (number of bits) of the TCI field may be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI may be larger than the size of the TCI field in UL DCI.

[0061] In the example of FIG. 4A, RRC sets a plurality of TCI states for DL. Each TCI state may be an SSB, a CSI-RS, or an SRS. The MAC CE activates a plurality of TCI states for DL among the set plurality of TCI states for DL. The DL DCI indicates at least one of the activated plurality of TCI states for DL. The indicated TCI state for DL is applied to the DL channel. The DL channel may be a CSI-RS / PDCCH / PDSCH.

[0062] In the example of FIG. 4B, RRC sets a plurality of TCI states for UL. Each TCI state may be an SSB, a CSI-RS, or an SRS. The MAC CE activates a plurality of TCI states for UL among the set plurality of TCI states for UL. The UL DCI indicates at least one of the activated plurality of TCI states for UL. The indicated TCI state for UL is applied to the UL channel. The UL channel may be a PUCCH / PUSCH.

[0063] <<Modification Example 1>> RRC may set a pool of TCI states common to UL and DL. One or more TCI states for DL and one or more TCI states for UL may be activated from the common pool.

[0064] In the example of FIG. 5, RRC sets a plurality of TCI states for DL and UL. Each TCI state may be an SSB, a CSI-RS, or an SRS.

[0065] The first MAC CE activates a plurality of DL TCI states among the set of a plurality of TCI states. The DL DCI indicates at least one of the activated plurality of DL TCI states. The indicated DL TCI state is applied to the DL channel. The DL channel may be CSI-RS / PDCCH / PDSCH.

[0066] The second MAC CE activates a plurality of UL TCI states among the set of a plurality of TCI states. The UL DCI indicates at least one of the activated plurality of UL TCI states. The indicated UL TCI state is applied to the UL channel. The UL channel may be PUCCH / PUSCH.

[0067] <<Modification Example 2>> One or more DL TCI states and one or more UL TCI states may be independently indicated from among the activated plurality of TCI states. The UL DCI and the DL DCI may indicate different TCI states.

[0068] In the example of FIG. 6, the RRC sets a plurality of TCI states for DL and UL. Each TCI state may be an SSB, CSI-RS, or SRS. The MAC CE activates a plurality of TCI states among the set of a plurality of TCI states.

[0069] The DL DCI indicates at least one DL TCI state of the activated plurality of TCI states. The indicated DL TCI state is applied to the DL channel. The DL channel may be CSI-RS / PDCCH / PDSCH.

[0070] The UL DCI indicates at least one UL TCI state of the activated plurality of TCI states. The indicated UL TCI state is applied to the UL channel. The UL channel may be PUCCH / PUSCH.

[0071] According to the above second embodiment, the TCI state for DL can be appropriately determined based on the TCI state for UL.

[0072] <Third Embodiment> The UE may fail to receive DCI. In the first and second embodiments, when the UL / DL beam is indicated by DCI and the reception of the DCI fails, a beam mismatch occurs between the UE and the base station.

[0073] In particular, when there is a beam mismatch in DCI (PDCCH), communication becomes difficult.

[0074] HARQ-ACK for DCI indication may be introduced. When the UE detects DCI including the TCI field, it may transmit an ACK. Then (after the waiting time from the transmission of the ACK), the UE may update the UL / DL beam. The waiting time may be K symbols / K slots.

[0075] HARQ-ACK for DCI indication may not be introduced.

[0076] If the UE receives a UL DCI that indicates a beam, the UE may transmit a PUSCH scheduled by the UL DCI (in the same manner as in Rel. 15) and update the UL / DL beam after a waiting time from the transmission of the PUSCH (e.g., the start symbol or the end symbol). The waiting time may be K symbols / K slots.

[0077] If the UE receives a DL DCI that indicates a beam, the UE may transmit HARQ-ACK information corresponding to the PDSCH scheduled by the DL DCI (in the same manner as in Rel. 15) and update the UL / DL beam after a waiting time from the transmission of the HARQ-ACK information (e.g., the start symbol or the end symbol). The HARQ-ACK information may be ACK or NACK. The waiting time may be K symbols / K slots.

[0078] K may be specified in the specification, may be set by RRC, or may be reported by the UE according to the UE capabilities.

[0079] If the reception of DCI including a new TCI field fails, or if ACK or NACK or PUSCH is not transmitted, the UE may not update the UL / DL beam (it may maintain the beam before the DCI).

[0080] According to the above third embodiment, the DL / UL beam recognition can be matched between the UE and the base station.

[0081] <Fourth Embodiment> UE capabilities corresponding to at least one function (feature) in the first to third embodiments may be defined. When the UE reports this UE capability, the UE may perform the corresponding function. When the UE reports this UE capability and the upper layer parameters corresponding to this function are set, the UE may perform the corresponding function. Upper layer parameters (RRC information elements) corresponding to this function may be defined. When this upper layer parameter is set, the UE may perform the corresponding function.

[0082] The UE capabilities may indicate whether the UE supports this function.

[0083] The UE capabilities may indicate the maximum number of TCI states set by RRC that the UE supports. The maximum number of TCI states set by RRC may be the maximum number of TCI states set for all of UL and DL. The maximum number of TCI states set by RRC for UL and the maximum number of TCI states set by RRC for DL may be reported independently.

[0084] The UE capability may indicate the maximum number of active TCI states supported by the UE. The maximum number of active TCI states may be the maximum number of active TCI states for all of UL and DL. The maximum number of active TCI states may be reported independently for the maximum number of active TCI states for UL and the maximum number of active TCI states for DL.

[0085] The UE capability may indicate whether the UE supports different active TCI state pools for UL and DL.

[0086] According to the fourth embodiment above, the UE can implement at least one function in the first to third embodiments while maintaining compatibility with existing specifications.

[0087] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present disclosure.

[0088] FIG. 7 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) standardized by the Third Generation Partnership Project (3GPP), 5th generation mobile communication system New Radio (5G NR), or the like.

[0089] In addition, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple Radio Access Technologies (RATs). 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.

[0090] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the Master Node (MN), and the base station (gNB) of NR is the Secondary Node (SN). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0091] The wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, NR-NR Dual Connectivity (NN-DC), where both the MN and the SN are base stations (gNBs) of NR).

[0092] The wireless communication system 1 may include a base station 11 that forms a relatively wide-coverage macro cell C1, and a base station 12 (12a - 12c) that is disposed within the macro cell C1 and forms a small cell C2 that is smaller than the macro cell C1. The user terminal 20 may be located within at least one cell. The arrangement and number of each cell and the user terminal 20 are not limited to the modes shown in the figures. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0093] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) and dual connectivity (DC) using a plurality of component carriers (CCs).

[0094] 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 higher than 24 GHz (above-24 GHz). Note that the frequency bands, definitions, etc. of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0095] Also, the user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0096] The plurality of base stations 10 may be connected by wire (e.g., an optical fiber compliant with Common Public Radio Interface (CPRI), an X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between 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.

[0097] The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one of, for example, Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0098] The user terminal 20 may be a terminal corresponding to at least one of communication systems such as LTE, LTE-A, 5G, etc.

[0099] In the wireless communication system 1, an Orthogonal Frequency Division Multiplexing (OFDM)-based wireless access method 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.

[0100] The wireless access method may be referred to as a waveform. Note that in the 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.

[0101] In the wireless communication system 1, as downlink channels, a Physical Downlink Shared Channel (PDSCH) shared by each user terminal 20, a Physical Broadcast Channel (PBCH), a Physical Downlink Control Channel (PDCCH), etc. may be used.

[0102] Also, in the wireless communication system 1, as uplink channels, a Physical Uplink Shared Channel (PUSCH) shared by each user terminal 20, a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), etc. may be used.

[0103] User data, upper layer control information, a System Information Block (SIB), etc. are transmitted by the PDSCH. User data, upper layer control information, etc. may be transmitted by the PUSCH. Also, a Master Information Block (MIB) may be transmitted by the PBCH.

[0104] 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 for at least one of the PDSCH and the PUSCH.

[0105] Note that the DCI for scheduling the PDSCH may be called DL assignment, DL DCI, etc., and the DCI for scheduling the PUSCH may be called UL grant, UL DCI, etc. Note that the PDSCH may be read as DL data, and the PUSCH may be read as UL data.

[0106] For PDCCH detection, a control resource set (CORESET) and a search space may be used. The CORESET corresponds to the resource for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a certain search space based on the search space configuration.

[0107] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. Note that the "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. in the present disclosure may be mutually substituted.

[0108] Uplink control information (UCI) including at least one of channel state information (CSI), delivery confirmation information (e.g., may be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) may be transmitted by PUCCH. A random access preamble for connection establishment with the cell may be transmitted by PRACH.

[0109] Note that in the present disclosure, downlink, uplink, etc. may be expressed without adding "link". Also, "Physical" may not be added at the beginning of various channels.

[0110] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may be transmitted.

[0111] The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, an SS Block (SSB), etc. Note that SS, SSB, etc. may also be called reference signals.

[0112] Also, in the wireless communication system 1, as the uplink reference signal (Uplink Reference Signal (UL-RS)), a sounding reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. may be transmitted. Note that DMRS may also be called a UE-specific reference signal.

[0113] (Base station) FIG. 8 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 transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may be provided.

[0114] In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0115] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0116] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission / reception, measurement, etc., using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data, control information, a sequence, etc. to be transmitted as a signal, and transfer it to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, etc.

[0117] The transmission / reception 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 transmission / reception unit 120 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0118] The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The reception unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0119] The transmission / reception antenna 130 can be composed of an antenna described based on the common understanding in the technical field related to the present disclosure, such as an array antenna.

[0120] The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0121] The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0122] The transmission / reception unit 120 (transmission processing unit 1211) may perform processing of the Packet Data Convergence Protocol (PDCP) layer, processing of the Radio Link Control (RLC) layer (e.g., RLC retransmission control), processing of the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, for example, and generate a bit sequence to be transmitted.

[0123] The transmission / reception unit 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 sequence to be transmitted, and output a baseband signal.

[0124] The transmission / reception unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmission / reception antenna 130.

[0125] On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmission / reception antenna 130.

[0126] The transmission / reception unit 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, and acquire user data, etc.

[0127] The transmission / reception unit 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.

[0128] The transmission path interface 140 may transmit 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.

[0129] Note that the transmission unit and reception unit of the base station 10 in the present disclosure may be configured by at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

[0130] The transmission / reception unit 120 may transmit a list of transmission configuration indication (TCI) states applicable to the downlink and uplink. The control unit 110 may control the transmission of one or more medium access control-control element (MAC CE) for determining one or more sets of active TCI states from the list, and the transmission of downlink control information (DCI) for determining one or more TCI states applied to at least one of the downlink and uplink signals from the one or more sets.

[0131] (User terminal) FIG. 9 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 transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided respectively.

[0132] Note that in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0133] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0134] 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.

[0135] The transmission / reception 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc., which are described based on the common knowledge in the technical field related to the present disclosure.

[0136] The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of the transmission processing unit 2211 and the RF unit 222. The reception unit may be composed of the reception processing unit 2212, the RF unit 222, and the measurement unit 223.

[0137] The transmission / reception antenna 230 can be composed of an antenna described based on the common knowledge in the technical field related to the present disclosure, such as an array antenna or the like.

[0138] The transmission / reception unit 220 may receive the above-described downlink channel, synchronization signal, downlink reference signal, etc. The transmission / reception unit 220 may transmit the above-described uplink channel, uplink reference signal, etc.

[0139] The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc.

[0140] The transmission / reception unit 220 (transmission processing unit 2211) may perform processing of the PDCP layer, processing of the RLC layer (e.g., RLC retransmission control), processing of the MAC layer (e.g., HARQ retransmission control), etc. on, for example, data and control information obtained from the control unit 210, and generate a bit sequence to be transmitted.

[0141] The transmission / reception unit 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, digital-to-analog conversion, etc. on the bit sequence to be transmitted, and output a baseband signal.

[0142] Whether or not to apply DFT processing may be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is enabled, the transmission / reception unit 220 (transmission processing unit 2211) may perform DFT processing as the above-described transmission processing to transmit the channel using the DFT-s-OFDM waveform, or if not, it may not perform DFT processing as the above-described transmission processing.

[0143] The transmission / reception unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230.

[0144] On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmission / reception antenna 230.

[0145] The transmission / reception unit 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.

[0146] The transmission / reception unit 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), reception 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.

[0147] Note that the transmission unit and reception unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

[0148] The transmission / reception unit 220 may receive a list of transmission configuration indication (TCI) states applicable to the downlink and uplink. The control unit 210 may determine, based on one or more medium access control-control element (MAC CE), one or more sets of active TCI states from the list, and may determine, based on the downlink control information (DCI), one or more TCI states to be applied to at least one signal of the downlink and uplink from the one or more sets.

[0149] After transmission of the uplink channel based on the DCI, the control unit 210 may apply the TCI state indicated by the DCI to the signal.

[0150] When the DCI schedules the downlink shared channel, the control unit 210 may apply the TCI state indicated by the DCI to the downlink signal. When the DCI schedules the uplink shared channel, the control unit 210 may apply the TCI state indicated by the DCI to the uplink signal.

[0151] When the DCI schedules the downlink shared channel, the control unit 210 may apply the TCI state indicated by the DCI to the downlink signal from among the first set activated by the first MAC CE. When the DCI schedules the uplink shared channel, the control unit 210 may apply the TCI state indicated by the DCI to the uplink signal from among the second set activated by the second MAC CE.

[0152] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0153] Here, functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit may be referred to as a transmitting unit, a transmitter, etc. In any case, as described above, the realization method is not particularly limited.

[0154] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 10 is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0155] In the present disclosure, terms such as device, circuit, device, section, unit, etc. can be read interchangeably with each other. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0156] For example, although only one processor 1001 is illustrated, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0157] Each function in the base station 10 and the user terminal 20 is realized, for example, by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs calculations to control communication via the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0158] The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, at least a part of the above-described control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0159] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 110(210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and the same may be true for other functional blocks.

[0160] The memory 1002 is a computer-readable recording medium, and may be constituted by, for example, at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), and other appropriate storage media. The memory 1002 may be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store a program (program code), software module, etc. executable for implementing the wireless communication method according to an embodiment of the present disclosure.

[0161] The storage 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0162] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-described transceiver unit 120 (220), transceiver antenna 130 (230), etc. may be implemented by the communication device 1004. The transceiver unit 120 (220) may be physically or logically separated and implemented by a transmitter unit 120a (220a) and a receiver unit 120b (220b).

[0163] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, a Light Emitting Diode (LED) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0164] 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 for each device.

[0165] In addition, 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 the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0166] (Modification example) Regarding the terms described in the present disclosure and the terms necessary for understanding the present disclosure, they may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be read interchangeably with each other. Also, a signal may be a message. A reference signal may also be abbreviated as RS and may be called a Pilot, a pilot signal, etc. depending on the applicable standard. Also, a Component Carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0167] 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 the radio frame may be called a subframe. Further, a subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on numerology.

[0168] Here, the new numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The new numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering process performed by a transceiver in the frequency domain, specific windowing process performed by a transceiver in the time domain, etc.

[0169] A slot may be composed of one or more symbols (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. Also, a slot may be a time unit based on the new numerology.

[0170] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be called a sub-slot. A mini-slot may be composed of a smaller number of symbols than a slot. A 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.

[0171] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for signal transmission. Different names corresponding to each of them may be used. Note that the time units such as frames, sub-frames, slots, mini-slots, and symbols in this disclosure may be read interchangeably with each other.

[0172] For example, one sub-frame may be called a TTI, or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or 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, a mini-slot, etc. instead of a sub-frame.

[0173] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station performs scheduling to allocate radio resources (such as the 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 the TTI is not limited to this.

[0174] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), code block, codeword, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when the TTI is given, the time interval (for example, the number of symbols) in which the transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0175] In addition, when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0176] 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 TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0177] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0178] A resource block (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0179] Also, an RB may include one or a plurality of symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be constituted by one or a plurality of resource blocks.

[0180] One or more RBs may also be referred to as a Physical Resource Block (PRB), a Sub-Carrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, etc.

[0181] Also, a resource block may be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0182] A Bandwidth Part (BWP) (which may also be referred to as a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0183] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). One or more BWPs may be set within one carrier for a UE.

[0184] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that in the present disclosure, "cell", "carrier", etc. may be read as "BWP".

[0185] Note that the structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be changed in various ways.

[0186] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or using corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0187] The names used for parameters, etc. in this disclosure are not limiting names in any way. Furthermore, mathematical formulas using these parameters, etc. may be different from those explicitly disclosed in this disclosure. Since various channels (such as PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0188] The information, signals, etc. described in this disclosure may be represented using any of various different technologies. For example, 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.

[0189] Also, information, signals, etc. can be output at least one of from a higher layer to a lower layer and from a lower layer to a higher layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0190] The input / output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. The information, signals, etc. to be input / output may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

[0191] 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 implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0192] Note that the physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, the RRC signaling may also be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. Further, the MAC signaling may be notified, for example, using a MAC Control Element (CE).

[0193] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification and may be performed implicitly (e.g., by not performing the notification of the predetermined information or by the notification of another piece of information).

[0194] The determination may be made based on a value represented by 1 bit (either 0 or 1), a boolean value represented by true or false, or a numerical comparison (for example, comparison with a predetermined value).

[0195] 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, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0196] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0197] The terms "system" and "network" used in this disclosure may be used interchangeably. "Network" may mean the devices (for example, base stations) included in the network.

[0198] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission 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", etc. can be used interchangeably.

[0199] In the present 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. can be used interchangeably. The base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0200] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0201] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", and "terminal" can be used interchangeably.

[0202] A mobile station may also be referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate term.

[0203] At least one of the base station and the mobile station may be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0204] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced by communication between a plurality of user terminals (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the user terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0205] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal 20 may be configured to be functions of the base station 10.

[0206] In the present disclosure, operations assumed to be performed by the base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal can 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 thereto), or a combination thereof.

[0207] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched during execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the presented specific order.

[0208] Each aspect / embodiment described in the present disclosure may be applicable to systems 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), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or a 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 (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable wireless communication methods, and next-generation systems extended based on these. Further, a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G) may be applicable.

[0209] As used in the present disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0210] Any reference to an element using terms such as "first", "second", etc. used in this disclosure does not generally limit the quantity or order of those elements. These terms can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any way.

[0211] The term "determining" as used in this disclosure may encompass a wide variety of operations. For example, "determining" may be considered to be "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up, search, inquiry" (e.g., searching in a table, database, or another data structure), "ascertaining", etc.

[0212] Also, "determining" may be considered to be "receiving" (e.g., receiving information), "transmitting" (e.g., transmitting information), "input", "output", "accessing" (e.g., accessing data in memory), etc.

[0213] Also, "determining" may be considered to be "resolving", "selecting", "choosing", "establishing", "comparing", etc. That is, "determining" may be considered to be "determining" some operation.

[0214] Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

[0215] The "maximum transmit power" described in this disclosure may mean the maximum value of the transmit power, or may mean the nominal UE maximum transmit power, or may mean the rated UE maximum transmit power.

[0216] As used in this disclosure, the terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0217] 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 also, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, optical (both visible and invisible) region, etc.

[0218] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0219] In the present disclosure, when the terms "include", "including" and their variants are used, these terms are intended to be inclusive, in the same manner as the term "comprising". Further, the term "or" used in the present disclosure is intended not to be an exclusive disjunction.

[0220] In the present disclosure, for example, when articles are added by translation, such as a, an and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0221] As described above in detail with respect to the invention according to the present disclosure, it is apparent 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 modifications and variations 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 for illustrative purposes and does not impose any limiting meaning on the invention according to the present disclosure.

[0222] This application is based on Japanese Patent Application No. 2020-144803 filed on August 28, 2020. The entire content thereof is incorporated herein by reference.

Claims

1. a receiving unit that receives a list of unified transmission configuration indication (TCI) states applicable to a downlink and an uplink; based on a medium access control - control element (MAC CE), determine an active TCI state from the list, and based on downlink control information (DCI) that schedules a downlink shared channel (PDSCH), determine a TCI state applied to the downlink and the uplink from the active TCI state; a control unit; a transmitting unit that transmits hybrid automatic repeat request - acknowledgement (HARQ - ACK) information for the DCI when the receiving unit receives the DCI that indicates a certain TCI state; The control unit updates the TCI state after a certain waiting time from the transmission of the HARQ - ACK information. A terminal.

2. The receiving unit of the terminal according to claim 1 receives a list of first unified TCI states commonly set for the downlink and the uplink using first upper layer signaling.

3. The receiving unit of the terminal according to claim 1 receives a list of first unified TCI states set for the downlink using first upper layer signaling, and receives a list of second unified TCI states set for the uplink using second upper layer signaling.

4. The transmitting unit of the terminal according to claim 1 reports capability information supporting a function of unified transmission configuration indication (TCI) states applicable to the downlink and the uplink.

5. receiving a list of unified transmission configuration indication (TCI) states applicable to a downlink and an uplink; Based on the medium access control-control element (MAC CE), determine the active TCI state from the list, and based on the downlink control information (DCI) that schedules the downlink shared channel (PDSCH), determine the TCI states applied to the downlink and uplink from the active TCI state; When the receiving unit receives the DCI indicating a certain TCI state, transmitting HARQ-ACK information for the DCI; A wireless communication method for a terminal, wherein the terminal updates the TCI state after a certain waiting time from the transmission of the HARQ-ACK information.

6. A transmitting unit that transmits a list of unified transmission configuration indication (TCI) states applicable to the downlink and uplink; A control unit that controls the transmission of a medium access control-control element (MAC CE) for determining an active TCI state from the list, and the transmission of downlink control information (DCI) that schedules a downlink shared channel (PDSCH) for determining the TCI states applied to the downlink and uplink from the active TCI state; A receiving unit that receives HARQ-ACK information for the DCI from the terminal when the terminal receives the DCI indicating a certain TCI state; The base station where the TCI state is updated after a certain waiting time from the transmission of the HARQ-ACK information.

7. A system having a terminal and a base station, The terminal is A receiving unit that receives a list of unified transmission configuration indication (TCI) states applicable to the downlink and uplink; Based on the medium access control - control element (MAC CE), determine the active TCI state from the list, and based on the downlink control information (DCI) that schedules the downlink shared channel (PDSCH), a control unit that determines the TCI states applied to the downlink and uplink from the active TCI state; a transmitting unit that transmits HARQ-ACK information for the DCI when the receiving unit receives the DCI that indicates a certain TCI state; the control unit updates the TCI state after a certain waiting time from the transmission of the HARQ-ACK information; the base station a system having a transmitting unit that transmits the list.

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