Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure includes a reception unit that receives a list of transmission configuration indication (TCI) states that can be applied in downlink and uplink, and a control unit that determines, based on one or more medium access control-control elements (MAC CEs), one or more sets of activated TCI states from the list, and determines, based on downlink control information (DCI), one or more TCI states applied to at least one signal in downlink and uplink from the one or more sets. According to one embodiment of the present disclosure, TCI states are appropriately controlled.

Description

Technical Field

[0001] This disclosure relates to terminals, wireless communication methods, and base stations in next-generation mobile communication systems. Background Technology

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was standardized with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving the height of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] The development of successor systems to LTE is also underway (e.g., also known as the 5th generation mobile communication system (5G), 5G+, the 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0007] The problem that the invention aims to solve

[0008] In future wireless communication systems (e.g., NR), research is underway on how user terminals (terminals, user equipment (UE)) control transmission and reception processing based on information related to quasi-co-location (QCL) (QCL concept / transmission configuration indication (TCI) status / spatial relationship).

[0009] However, there are situations where information related to QCL is unclear. If this information is unclear, it may lead to reduced communication quality and lower throughput.

[0010] Therefore, one of the purposes of this disclosure is to provide a terminal, wireless communication method, and base station capable of appropriately determining the TCI state.

[0011] Methods for solving problems

[0012] One aspect of this disclosure relates to a terminal comprising: a receiving unit that receives a list of transmit setting indication (TCI) states applicable in the downlink and uplink; and a control unit that, based on one or more medium access control-control elements (MAC CEs), determines from the list one or more sets of activated TCI states, and based on downlink control information (DCI), determines from the one or more sets one or more TCI states applied to at least one signal in the downlink and uplink.

[0013] Invention Effects

[0014] According to one method disclosed herein, the TCI status can be appropriately determined. Attached Figure Description

[0015] Figure 1 This is a diagram illustrating an example of the unified TCI framework.

[0016] Figure 2 This is a diagram illustrating an example of a unified TCI status notification method.

[0017] Figure 3 This is a diagram illustrating an example of the method for determining the TCI state according to the first embodiment.

[0018] Figure 4A as well as Figure 4B This is a diagram illustrating an example of the method for determining the TCI state according to the second embodiment.

[0019] Figure 5 This is a diagram illustrating an example of a method for determining the TCI state according to a variation of the second embodiment, Example 1.

[0020] Figure 6 This is a diagram illustrating an example of a method for determining the TCI state according to a variation of the second embodiment, Example 2.

[0021] Figure 7 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0022] Figure 8 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0023] Figure 9 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0024] Figure 10 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0025] (TCI, Spatial Relations, QCL)

[0026] In NR, the following is being studied: receiving processing (e.g., at least one of receiving, demapping, demodulation, and decoding) and transmitting processing (e.g., at least one of transmitting, mapping, precoding, modulation, and encoding) in a UE based on at least one of the Transmission Configuration Indication state (TCI state), control signals, and channels (referred to as signal / channel).

[0027] TCI states can also represent the states of signals / channels applied to the downlink. States equivalent to the TCI states of signals / channels applied to the uplink can also be described as spatial relations.

[0028] TCI status refers to information related to the quasi-co-location (QCL) of signals / channels, and can also be referred to as spatial reception parameters, spatial relation information, etc. TCI status can also be set by the UE on a per-channel or per-signal basis.

[0029] QCL is an indicator of the statistical properties of a signal / channel. For example, the fact that a certain signal / channel is QCL-relationed with other signals / channels can also mean that at least one of the following parameters (Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter, e.g., spatial Rxparameter) is the same across these different signals / channels (at least one of these is QCL).

[0030] Additionally, the spatial reception parameters may also correspond to the UE's receive beam (e.g., receive analog beam), and the beam may also be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in this disclosure may also be replaced with sQCL (spatial QCL).

[0031] QCLs can also be specified in multiple types (QCL types). For example, four different QCL types (AD) can be defined that can be assumed to have the same parameter (or parameter set). The following is an explanation of this parameter (also referred to as a QCL parameter):

[0032] • QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread.

[0033] • QCL Type B (QCL-B): Doppler shift and Doppler extension.

[0034] • QCL Type C (QCL-C): Doppler shift and average delay,

[0035] • QCL type D (QCL-D): Space reception parameters.

[0036] The assumption that a UE envisions a specific QCL (e.g., QCL type D) relationship between a certain Control Resource Set (CORESET), channel, or reference signal and other CORESETs, channels, or reference signals can also be referred to as a QCL assumption.

[0037] The UE can also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI state or QCL assumption of the signal / channel.

[0038] The TCI state can also be information related to the QCL of the channel being targeted (in other words, the reference signal (RS) used by that channel) and other signals (e.g., other RS). The TCI state can also be set (indicated) by higher-layer signaling, physical-layer signaling, or a combination thereof.

[0039] Physical layer signaling can also be, for example, downlink control information (Downlink Control Information (DCI)).

[0040] The channel that is set (specified) to TCI state or spatial relationship can be, for example, at least one of the following: downlink shared channel (Physical Downlink Shared Channel (PDSCH))), downlink control channel (Physical Downlink Control Channel (PDCCH))), uplink shared channel (Physical Uplink Shared Channel (PUSCH))), and uplink control channel (Physical Uplink Control Channel (PUCCH))).

[0041] Furthermore, the RS that is related to the channel as QCL can be at least one of the following: a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), a Measurement Reference Signal (Sounding Reference Signal (SRS)), a Tracking CSI-RS (also known as a Tracking Reference Signal (TRS)), or a QCL Detection Reference Signal (also known as a QRS).

[0042] An SSB is a block of signals that contains at least one Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and broadcast channel (Physical Broadcast Channel (PBCH)). An SSB can also be referred to as an SS / PBCH block.

[0043] The RS of QCL type X in TCI state can also refer to the RS that has a QCL type X relationship with a certain channel / signal (DMRS), and the RS can also be called the QCL source of QCL type X in TCI state.

[0044] (Unified TCI Framework)

[0045] We are investigating the use of the same TCI state in both the UL and DL channels.

[0046] exist Figure 1 In the example, the TCI state containing 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.

[0047] The use of RRC / MAC-CE / DCI in the selection of a TCI status for UL / DL is under investigation.

[0048] exist Figure 2 In the example, multiple DLs are set using a unified TCI state via RRC, and multiple ULs are set using a unified TCI state via RRC. Each of the multiple DLs using a unified TCI state and the multiple ULs using a unified TCI state can also be an SSB, CSI-RS, or SRS.

[0049] The DL set via RRC is activated as a DL using the unified TCI state via MAC CE. The DL set via RRC is activated as a UL using the unified TCI state via MAC CE. The UL set via RRC is activated as a UL using the unified TCI state via MAC CE. The DL activated via MAC CE is indicated via DCI as a DL using the unified TCI state. The UL activated via MAC CE is indicated via DCI as a UL using the unified TCI state.

[0050] However, how to set / activate / indicate the TCI status is not clearly defined. If the method for determining the TCI status is unclear, there are concerns that it may lead to reduced communication quality, reduced throughput, and other issues.

[0051] Therefore, the inventors of this invention conceived of a method for determining the TCI state.

[0052] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods involved in each embodiment can be applied individually or in combination.

[0053] In this disclosure, "A / B / C" and "at least one of A, B, and C" can be substituted for each other. In this disclosure, cell, CC, carrier, BWP, DL BWP, UL BWP, activated DL BWP, activated UL BWP, and band domain can also be substituted for each other. In this disclosure, index, ID, indicator, and resource ID can also be substituted for each other. In this disclosure, support, control, capable of control, operation, and capable of operation can also be substituted for each other.

[0054] In this disclosure, configure, activate, update, indicate, enable, specify, and select can also be used interchangeably.

[0055] In this disclosure, MAC CE and activation / deactivation commands can be used interchangeably.

[0056] In this disclosure, higher-layer signaling may be any one or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc. In this disclosure, RRC, RRC signaling, RRC parameters, higher-layer parameters, RRC information elements (IEs), and RRC messages may also be used interchangeably.

[0057] MAC signaling can also use MAC Control Element (MAC CE) or MAC Protocol Data Unit (PDU). Broadcast information can also be, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0058] In this disclosure, beam, spatial domain filter, spatial setting, TCI state, UL TCI state, unified TCI state, QCL concept, QCL parameters, spatial domain receive filter, UE spatial domain receive filter, UE receive beam, DL beam, DL receive beam, DL precoder, DL precoder, DL-RS, RS of QCL type D in TCI state / QCL concept, RS of QCL type A in TCI state / QCL concept, spatial relationship, spatial domain transmit filter, UE spatial domain transmit filter, UE transmit beam, UL beam, UL transmit beam, UL precoder, UL precoder, and PL-RS can also be interchanged. In this 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, and SRS can also be interchanged.

[0059] UL DCI, DCI of scheduling UL channel (PUSCH), and DCI format 0_x (x = 0, 1, 2, ...) can also be interchanged. DL DCI, DCI of scheduling DL channel (PDSCH), and DCI format 1_x (x = 0, 1, 2, ...) can also be interchanged.

[0060] (Wireless communication method)

[0061] In this disclosure, pool, set, group, and list can be used interchangeably.

[0062] <First Implementation>

[0063] The UE can also envision the same TCI state pool for UL and DL.

[0064] RRC (parameters, information elements) can also set multiple TCI states (pools) for UL / DL channels.

[0065] MAC CE can also select (activate) one or more (e.g., multiple) TCI states (sets) for the UL / DL channel.

[0066] The UL / DL DCI can also select (indicate) more than one (e.g., one) TCI state. This TCI state can also be applied to multiple UL / DL channels. The UL / DL channels can also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0067] The UL / DL DCI can also include a new TCI field. The UL / DL DCI can also be at least one of the DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field can also select at least one of multiple active TCI states (e.g., one).

[0068] If the new TCI field exists in DCI formats 1_1 and 1_2, the TCI field in Rel.15 / 16 may not exist in DCI formats 1_1 and 1_2.

[0069] The new TCI field in DCI memory can also be set at a higher level. The new DCI field in UL DCI memory and the new DCI field in DL DCI memory can also be set independently (separately). The new DCI field in UL DCI memory and the new DCI field in DL DCI memory can also be set jointly.

[0070] The size (number of bits) of the TCI field can be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI can also be larger than the size of the TCI field in UL DCI.

[0071] exist Figure 3 In the example, RRC sets multiple TCI states for DL ​​and UL. Each of the multiple TCI states can also be SSB, CSI-RS, or SRS. MAC CE activates a portion of the set multiple TCI states. DCI indicates at least one of the activated multiple TCI states.

[0072] The indicated TCI state is applied to multiple UL / DL channels. UL / DL channels can also be PDCCH / PDSCH / PUSCH / SRS / PUCCH.

[0073] According to the first embodiment described above, the TCI state set in a pool can be used for UL and DL channels.

[0074] <Second Implementation>

[0075] The UE can also use different TCI state pools for each of the UL and DL assumptions.

[0076] RRC (parameters, information elements) can also set multiple TCI states (pools) for each of the UL and DL channels.

[0077] The MAC CE can also activate more than one (e.g., multiple) TCI states (sets) for each selection of the UL and DL channels. The MAC CE can also activate two sets of TCI states.

[0078] DL DCI can also select (indicate) more than one (e.g., one) TCI state. This TCI state can also be applied to more than one DL channel. The DL channel can also be PDCCH / PDSCH / CSI-RS.

[0079] The UL DCI selects (indicates) one or more (e.g., one) TCI states. This TCI state can also be applied to more than one UL channel. The UL channel can also be PUSCH / SRS / PUCCH.

[0080] The UL / DL DCI can also include a new TCI field. The UL / DL DCI can also be at least one of the DCI formats 0_1, 0_2, 1_1, and 1_2. The new TCI field can also select at least one of multiple active TCI states (e.g., one).

[0081] If the new TCI field exists in DCI formats 1_1 and 1_2, the TCI field in Rel.15 / 16 may not exist in DCI formats 1_1 and 1_2. The new TCI field may also not exist in DCI formats 1_1 and 1_2. Existing TCI fields may also be reused for indicating the TCI status in this implementation.

[0082] The new TCI field in DCI memory can also be set at a higher level. The new DCI field in UL DCI memory and the new DCI field in DL DCI memory can also be set independently (separately). The new DCI field in UL DCI memory and the new DCI field in DL DCI memory can also be set jointly.

[0083] The size (number of bits) of the TCI field can be the same or different in UL DCI and DL DCI. For example, the size of the TCI field in DL DCI can also be larger than the size of the TCI field in UL DCI.

[0084] exist Figure 4A In the example, RRC sets multiple TCI states for DL. Each TCI state can also be SSB, CSI-RS, or SRS. MAC CE activates one of the set multiple TCI states for DL. DL DCI indicates at least one of the activated multiple TCI states for DL. The indicated TCI state for DL ​​is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0085] exist Figure 4BIn the example, RRC sets multiple TCI states for UL. Each TCI state can also be SSB, CSI-RS, or SRS. MAC CE activates one of the set UL-use TCI states. UL DCI indicates at least one of the activated UL-use TCI states. The indicated UL-use TCI state is applied to the UL channel. The UL channel can also be PUCCH / PUSCH.

[0086] Variation Example 1

[0087] RRC can also set a pool of common TCI states for UL and DL. It can also activate more than one DL TCI state and more than one UL TCI state from the common pool.

[0088] exist Figure 5 In the example, RRC sets multiple TCI states for DL ​​and UL. Each TCI state can also be SSB, CSI-RS, or SRS.

[0089] The first MAC CE activates multiple TCI states for DL ​​among the set TCI states. DL DCI indicates at least one of the activated TCI states for DL. The indicated TCI state for DL ​​is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0090] The second MAC CE activates multiple TCI states for UL among the set TCI states. The UL DCI indicates at least one of the activated TCI states for UL. The indicated TCI state for UL is applied to the UL channel. The UL channel can also be PUCCH / PUSCH.

[0091] Variation Example 2

[0092] It is also possible to independently indicate one or more DL-based TCI states and one or more UL-based TCI states from multiple activated TCI states. UL DCI and DL DCI can also indicate different TCI states.

[0093] exist Figure 6 In the example, RRC sets multiple TCI states for DL ​​and UL. Each TCI state can also be SSB, CSI-RS, or SRS. MAC CE activates multiple TCI states among the set TCI states.

[0094] The DL DCI indicates at least one DL-use TCI state among multiple activated TCI states. The indicated DL-use TCI state is applied to the DL channel. The DL channel can also be CSI-RS / PDCCH / PDSCH.

[0095] The UL DCI indicates at least one UL-specific TCI state among multiple activated TCI states. The indicated UL-specific TCI state is applied to the UL channel. The UL channel can also be a PUCCH / PUSCH.

[0096] According to the second embodiment described above, the TCI state for DL ​​and the TCI state for UL can be appropriately determined.

[0097] <Third Implementation Method>

[0098] In the event of a failure to receive the UE's DCI, in the first and second embodiments, the UL / DL beam is indicated via the DCI, resulting in a beam offset between the UE and the base station in the event of a DCI reception failure.

[0099] In particular, communication becomes difficult when there is beam deviation in DCI (PDCCH).

[0100] HARQ-ACK can also be imported for DCI indication. The UE can also send an ACK if a DCI containing the TCI field is detected. Afterwards (a standby time following the transmission of the ACK), the UE can update the UL / DL beam. The standby time can also be K symbols / K slots.

[0101] It is also possible to avoid importing HARQ-ACK for DCI instructions.

[0102] When the UE receives a UL DCI indicating the beam, the UE can also (in the same manner as Rel.15) transmit a PUSCH scheduled through that UL DCI and update the UL / DL beam after a standby time following the transmission of the PUSCH (e.g., the start symbol or the end symbol). The standby time can also be K symbols / K slots.

[0103] When the UE receives a DL DCI indicating the beam, the UE can also (in the same manner as Rel.15) send a HARQ-ACK message corresponding to the PDSCH scheduled through that DL DCI, and update the UL / DL beam after a standby time starting from the transmission of the HARQ-ACK message (e.g., start symbol or end symbol). The HARQ-ACK message can also be ACK or NACK. The standby time can also be K symbols / K slots.

[0104] K can be specified in the specification, set via RRC, or reported from the UE based on the UE's capabilities.

[0105] In the event of a DCI containing a new TCI field failing to be received, the UE may not update the UL / DL beam (or may maintain the previous beam of the DCI) without receiving an ACK, NACK, or PUSCH.

[0106] According to the third embodiment described above, it is possible to make the identification of DL / UL beams consistent between the UE and the base station.

[0107] <Fourth Implementation>

[0108] Alternatively, a UE capability corresponding to at least one function (feature) in the first to third embodiments can be specified. When the UE reports this UE capability, the UE can also perform the corresponding function. When the UE reports this UE capability and a higher-level parameter corresponding to the function is set, the UE can also perform the corresponding function. Alternatively, a higher-level parameter (RRC information element) corresponding to the function can be specified. When this higher-level parameter is set, the UE can also perform the corresponding function.

[0109] UE capabilities can also indicate whether the UE supports the function.

[0110] UE capabilities can also indicate the maximum number of TCI states that the UE supports, which can be set via RRC. The maximum number of TCI states set via RRC can also be the maximum number of all TCI states set for UL and DL. The maximum number of TCI states set via RRC can also be reported independently for the maximum number of TCI states set for UL and the maximum number of TCI states set for DL.

[0111] UE capabilities can also represent the maximum number of active TCI states supported by the UE. The maximum number of active TCI states can also be the maximum number of active TCI states for both UL and DL. The maximum number of active TCI states can also be reported separately for the maximum number of active TCI states for UL and the maximum number of active TCI states for DL.

[0112] UE capabilities can also indicate whether the UE supports different active TCI state pools for UL and DL.

[0113] According to the fourth embodiment described above, the UE can maintain compatibility with existing specifications and can implement at least one function in the first to third embodiments.

[0114] (Wireless Communication System)

[0115] The structure of a wireless communication system according to one embodiment of this disclosure will now 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 this disclosure.

[0116] Figure 7 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 can also be a system that uses Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) as standardized by the Third Generation Partnership Project (3GPP).

[0117] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also 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)), etc.

[0118] 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.

[0119] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0120] The wireless communication system 1 may also include a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located within at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0121] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0122] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). Furthermore, the frequency bands and definitions of FR1 and FR2 are not limited to these; for example, FR1 can also be equivalent to a frequency band higher than FR2.

[0123] In addition, user terminal 20 can also use at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) to communicate in each CC.

[0124] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on the Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, base station 11, which is equivalent to a host station, can also be referred to as an Integrated Access Backhaul (IAB) donor, and base station 12, which is equivalent to a relay station, can also be referred to as an IAB node.

[0125] Base station 10 may also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include, for example, at least one of Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0126] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0127] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL) links, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), and Single Carrier Frequency Division Multiple Access (SC-FDMA) can also be used.

[0128] The wireless access method can also be referred to as a waveform. In addition, in the wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be used in the wireless access methods of UL and DL.

[0129] As a downlink channel, the wireless communication system 1 can also use downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), downlink control channels (Physical Downlink Control Channel (PDCCH)) and so on, which are shared by each user terminal 20.

[0130] In addition, as uplink channels, the wireless communication system 1 may also use uplink shared channels (Physical Uplink Shared Channel (PUSCH)), uplink control channels (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random Access Channel (PRACH)) and so on, which are shared by each user terminal 20.

[0131] User data, high-level control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. User data and high-level control information can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0132] Lower-layer control information can also be transmitted via PDCCH. Lower-layer control information may include, for example, downlink control information (DCI), which includes scheduling information for at least one of PDSCH and PUSCH.

[0133] Additionally, the DCI that schedules PDSCH can also be called DL allocation, DL DCI, etc., and the DCI that schedules PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can also be replaced with DL data, and PUSCH can also be replaced with UL data.

[0134] In PDCCH detection, a Control Resource Set (CORESET) and a search space can be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0135] A search space can also correspond to one or more PDCCH candidates equivalent to one or more aggregation levels. One or more search spaces can also be referred to as a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" used in this disclosure can be used interchangeably.

[0136] Uplink control information (UCI) including at least one of Channel State Information (CSI), delivery confirmation information (such as Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.), and Scheduling Request (SR) can also be transmitted via PUCCH. Random access preambles used for establishing a connection with the cell can also be transmitted via PRACH.

[0137] Furthermore, in this disclosure, downlink, uplink, etc., may be described without the word "link". Additionally, various channels may be described without the word "physical".

[0138] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. As DL-RS, wireless communication system 1 can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), phase tracking reference signals (PTRS), etc.

[0139] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SS block (SSB), etc. Furthermore, SS, SSB, etc., can also be called reference signals.

[0140] Furthermore, in the wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, the DMRS can also be referred to as a user terminal-specific reference signal (UE-specific reference signal).

[0141] (Base station)

[0142] Figure 8 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, the control unit 110, the transmit / receive unit 120, the transmit / receive antenna 130, and the transmission path interface 140 may each be provided in more than one manner.

[0143] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it can also be envisioned that the base station 10 also possesses other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0144] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0145] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0146] The transmitting / receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0147] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be composed of a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0148] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0149] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0150] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0151] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform processing at the Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer (e.g., RLC retransmission control), and Medium Access Control (MAC) layer (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0152] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0153] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0154] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the signals of the wireless frequency band received through the transmitting and receiving antenna 130 into the baseband signal.

[0155] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0156] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc., based on the received signal. The measurement unit 123 can also 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 can also be output to the control unit 110.

[0157] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0158] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure may also be composed of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0159] The transmit / receive unit 120 can also transmit a list of transmit setting indication (TCI) states that can be applied in the downlink and uplink. The control unit 110 can also control the transmission of more than one medium access control-control element (MAC CE) for determining more than one set of TCI states to be activated from the list, and the transmission of downlink control information (DCI) for determining more than one TCI state to be applied to at least one signal in the downlink and uplink from the more than one set.

[0160] (User terminal)

[0161] Figure 9This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be included.

[0162] Furthermore, while this example primarily illustrates the functional blocks of the characteristic portions of this embodiment, it is also conceivable that the user terminal 20 may also have other functional blocks required for wireless communication. Some of the processing of each unit described below may also be omitted.

[0163] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the technical field to which this disclosure pertains.

[0164] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0165] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0166] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0167] The transmitting and receiving antenna 230 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0168] The transmitting / receiving unit 220 can also receive the downlink channel, synchronization signal, downlink reference signal, etc., mentioned above. The transmitting / receiving unit 220 can also transmit the uplink channel, uplink reference signal, etc., mentioned above.

[0169] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0170] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0171] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be transmitted, and output the baseband signal.

[0172] Furthermore, the application of DFT processing can be based on the transform precoding settings. For a specific channel (e.g., PUSCH), if transform precoding is enabled, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above without performing DFT processing.

[0173] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0174] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0175] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0176] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0177] Alternatively, the transmitting and receiving units of the user terminal 20 in this disclosure may also be composed of at least one transmitting / receiving unit 220 and transmitting / receiving antenna 230.

[0178] The transmit / receive unit 220 can also receive a list of transmit setting indication (TCI) states that can be applied in the downlink and uplink. The control unit 210 can also determine one or more sets of active TCI states from the list based on one or more medium access control-control elements (MAC CEs), and determine one or more TCI states that are applied to at least one signal in the downlink and uplink based on downlink control information (DCI).

[0179] The control unit 210 may also apply the TCI state indicated by the DCI to the signal after the transmission of the uplink channel based on the DCI.

[0180] When the DCI schedules a downlink shared channel, the control unit 210 can also apply the TCI state indicated by the DCI to the downlink signals. When the DCI schedules an uplink shared channel, the control unit 210 can also apply the TCI state indicated by the DCI to the uplink signals.

[0181] In the case of DCI scheduling downlink shared channel, the control unit 210 may also apply the TCI states indicated by the DCI in the first set activated by the first MAC CE to the downlink signals. In the case of DCI scheduling uplink shared channel, the control unit 210 may also apply the TCI states indicated by the DCI in the second set activated by the second MAC CE to the uplink signals.

[0182] (Hardware Structure)

[0183] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining the aforementioned single device or multiple devices with software.

[0184] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0185] For example, the base station, user terminal, etc., in one embodiment of this disclosure can also function as a computer for processing the wireless communication method of this disclosure. FIG15 is a diagram showing an example of the hardware structure of the base station and user terminal according to an embodiment. The base station 10 and user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0186] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0187] For example, only one processor 1001 is shown, but there can be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be implemented using more than one chip.

[0188] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 can perform calculations and control communication via the communication device 1004, or control at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0189] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0190] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001; similar implementations can be made for other functional blocks.

[0191] The memory 1002 may also be a computer-readable recording medium, such as being composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 is capable of storing executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of this disclosure.

[0192] Storage device 1003 may also be a computer-readable recording medium, such as comprising at least one of the following: flexible disc, floppy disk, optical disk (e.g., compact disc ROM, CD-ROM, etc.), digital multifunction disk, Blu-ray disc, removable disk, hard disk, smart card, flash memory device (e.g., card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0193] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be implemented by physically or logically separating the transmit unit 120a (220a) and the receive unit 120b (220b).

[0194] Input device 1005 is an input device that receives input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, light-emitting diode (LED) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0195] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses between the devices.

[0196] Furthermore, the base station 10 and the user terminal 20 can also 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), or a field-programmable gate array (FPGA), and can be used to implement some or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0197] (Modified Example)

[0198] Furthermore, the terms described in this disclosure, as well as those necessary for understanding this disclosure, may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be abbreviated as RS, and may be referred to as pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as cell, frequency carrier, carrier frequency, etc.

[0199] A radio frame can also be composed of one or more periods (frames) in the time domain. Each of these periods (frames) that constitutes a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0200] Here, the parameter set can also be communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0201] In the time domain, a time slot can also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0202] A time slot can also contain multiple mini-time slots. Each mini-time slot can also consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-time slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-time slots can also be called PDSCH (PUSCH) mapping type B.

[0203] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0204] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0205] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0206] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to transmission blocks, code blocks, codewords, etc. can be shorter than the TTI.

[0207] Additionally, where a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0208] A TTI with a duration of 1 ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), standard TTI, long TTI, normal subframe, standard subframe, long subframe, time slot, etc. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini time slot, sub-time slot, time slot, etc.

[0209] In addition, long TTIs (e.g., normal TTIs, subframes, etc.) can be replaced with TTIs with a duration of more than 1 ms, and short TTIs (e.g., shortened TTIs, etc.) can be replaced with TTIs with a duration of less than long TTIs but more than 1 ms.

[0210] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0211] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0212] In addition, one or more RBs can also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0213] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0214] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a certain carrier. Here, common RBs can also be determined by the index of RBs based on the common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0215] A BWP can also include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs can also be set within a single carrier.

[0216] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, terms such as "cell" and "carrier" in this disclosure can be replaced with "BWP".

[0217] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0218] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0219] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical expressions, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0220] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0221] Furthermore, information, signals, etc., can be output in at least one of the following directions: from higher level (upper layer) to lower level (lower layer), and from lower layer to higher level. Information, signals, etc., can also be input and output via multiple network nodes.

[0222] Input and output information, signals, etc., can be stored in a specific location (e.g., memory) or managed using management tables. Input and output information, signals, etc., can be overwritten, updated, or appended. Output information, signals, etc., can also be deleted. Input information, signals, etc., can also be sent to other devices.

[0223] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI), etc.), higher 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 combinations thereof.

[0224] In addition, physical layer signaling can also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, the MAC control element (CE).

[0225] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0226] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0227] Whether software is called software, firmware, middleware, microcode, hardware description language, or any other name, it should be broadly interpreted to refer to 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.

[0228] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0229] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0230] In this disclosure, the terms "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", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0231] In this disclosure, the terms "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access Point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "Panel", "Cell", "Sector", "Cell Group", "Carrier", and "Component Carrier" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0232] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0233] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably.

[0234] There are also instances where mobile stations are referred to as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or several other appropriate terms.

[0235] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an Internet of Things (IoT) device such as a sensor.

[0236] Furthermore, the base station in this disclosure can also be replaced by a user terminal. For example, various methods / implementations of this disclosure can be applied to a structure where the communication between the base station and the user terminal is replaced by communication between multiple user terminals (e.g., also referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0237] Similarly, the user terminal in this disclosure can also be replaced by a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0238] In this disclosure, operations are assumed to be performed by the base station, and sometimes, depending on the circumstances, by its upper node. Clearly, in a network containing one or more network nodes having a base station, various operations for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), etc., but not limited to these), or combinations thereof.

[0239] The various methods / implementations described in this disclosure can be used individually or in combination, and can be switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the methods described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0240] The various methods / implementations described in this disclosure can also be applied to 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) (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 This includes 802.11 (Wi-Fi, registered trademark), IEEE 802.16 (WiMAX, registered trademark), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems utilizing other suitable wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, combinations with 5G, etc.) for application.

[0241] As used in this disclosure, the term "based on" does not mean "based on only" unless otherwise specified. In other words, the term "based on" means both "based on only" and "based on at least".

[0242] Any reference to an element using the designations "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not imply that only two elements may be used, or that the first element must take precedence over the second element in some form.

[0243] The term "determining" as used in this disclosure can encompass a wide variety of operations. For example, "determining" can also refer to judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), and ascertaining.

[0244] In addition, "judgment (decision)" can also refer to receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, accessing (e.g., accessing data in memory), etc., as situations where "judgment (decision)" is performed.

[0245] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, or comparing are considered as making a "judgment (decision)". In other words, "judgment (decision)" can also refer to certain actions as situations where a "judgment (decision)" is made.

[0246] In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0247] The term "maximum transmit power" as used in this disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0248] As used in this disclosure, the terms "connected," "coupled," or any variations thereof, refer to all direct or indirect connections or combinations between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The connections or combinations between elements can be physical, logical, or a combination thereof. For example, "connected" can also be replaced with "access."

[0249] In this disclosure, when two elements are connected, it is possible to use more than one wire, cable, printed electrical connection, etc., and to use electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region as several non-limiting and non-inclusive examples, so that they are "connected" or "combined" with each other.

[0250] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other." Additionally, the term can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0251] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," mean inclusive. Furthermore, the term "or" as used in this disclosure does not mean XOR.

[0252] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0253] The invention disclosed herein has been described in detail above. However, it will be apparent to those skilled in the art that the invention is not limited to the embodiments described herein. The invention can be implemented with modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the invention in any way.

[0254] This application is based on Japanese Special Application 2020-144803, filed on August 28, 2020. The entire contents of that application are included herein.

Claims

1. A terminal, comprising: The receiving unit receives a list of unified transmission setting indication states, i.e., unified TCI states, that can be applied in the downlink and uplink. The control unit, based on the Medium Access Control-Control Element (MAC CE), determines the active TCI state from the list, and based on the Downlink Control Information (DCI) of the Scheduled Downlink Shared Channel (PDSCH), determines the TCI state to be applied to the downlink and uplink from the active TCI states; and The transmitting unit, upon receiving the DCI indicating a certain TCI state, sends HARQ-ACK information for the DCI. The control unit updates the TCI state after sending the first K code element of the HARQ-ACK information.

2. The terminal as described in claim 1, wherein, The receiving unit uses first higher-layer signaling to receive a list of unified TCI states that are commonly set for the downlink and uplink.

3. The terminal as described in claim 1, wherein, The receiving unit uses a first higher-layer signaling to receive a list of first unified TCI states set for the downlink and a second higher-layer signaling to receive a list of second unified TCI states set for the uplink.

4. The terminal as described in claim 1, comprising: The transmitting unit reports capability information supporting the unified transmission setting indication state, i.e., unified TCI state, which can be applied in both downlink and uplink.

5. A wireless communication method, which is a wireless communication method for a terminal, comprising: The steps of receiving a list of unified transmission setting indication states, i.e. unified TCI states, that can be applied in the downlink and uplink. Based on the Media Access Control-Control Element (MAC CE), the active TCI state is determined from the list; based on the Downlink Control Information (DCI) of the Scheduled Downlink Shared Channel (PDSCH), the steps for determining the TCI states applied to the downlink and uplink from the active TCI states; and Upon receiving the DCI indicating a certain TCI state, the step of sending HARQ-ACK information for the DCI is as follows: The terminal updates the TCI state after sending the first K code element of the HARQ-ACK information.

6. A base station, comprising: The transmitting unit transmits a list of unified transmission setting indication states, i.e., unified TCI states, that can be applied in the downlink and uplink. The control unit controls the transmission of Media Access Control-Control Elements (MAC CEs) for determining one or more sets of activated TCI states from the list, and the transmission of Downlink Control Information (DCI) for determining the TCI states applied to the downlink and uplink from the activated TCI states; and the transmission of Downlink Shared Channel (PDSCH) scheduling DCI. The receiving unit receives HARQ-ACK information for the DCI from the terminal. The TCI state indicated by the DCI is updated after the first K codewords from the transmission of the HARQ-ACK message.

7. A system having a terminal and a base station, The terminal has: The receiving unit receives a list of unified transmission setting indication states, i.e., unified TCI states, that can be applied in the downlink and uplink. The control unit, based on the Medium Access Control-Control Element (MAC CE), determines the active TCI state from the list, and based on the Downlink Control Information (DCI) of the Downlink Shared Channel (PDSCH), determines the TCI states applied to the downlink and uplink from the active TCI states; and The transmitting unit, upon receiving the DCI indicating a certain TCI state, sends HARQ-ACK information for the DCI. The control unit updates the TCI state after sending the first K code elements of the HARQ-ACK information. The base station has: A sending unit sends the list.

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