Terminal, base station, system and wireless communication method

Abstract

In order to properly control the designation of the TCI state of a user terminal, the user terminal involved in one aspect of the present disclosure has: a receiving unit, which receives downlink control information, the downlink control information including a field that specifies the state of a transmission structure indication (TCI); and a control unit, which determines the state of the TCI specified by the field based on at least one of a cell scheduled by the downlink control information and a bandwidth part (BWP) specified by the downlink control information.

Description

Technical Field

[0001] The present disclosure relates to a user terminal and a wireless communication method in a new generation mobile communication system. Background Art

[0002] In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been standardized for the purpose of higher data rates, lower latency, etc. (Non-Patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) has been standardized for the purpose of greater capacity and higher levels of LTE (LTE Rel. 8, 9).

[0003] Subsequent systems of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G+(plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE El.14 or 15 and higher versions, etc.) are also studied.

[0004] In the existing LTE system (e.g., LTE Rel.8-14), the user terminal (UE: User Equipment) controls the reception of the downlink shared channel (e.g., PDSCH: Physical Downlink Shared Channel) based on the downlink control information (DCI: Downlink Control Information, also known as DL allocation, etc.) transmitted via the downlink control channel (e.g., PDCCH: Physical Downlink Control Channel). In addition, the user terminal controls the transmission of the uplink shared channel (e.g., PUSCH: Physical Uplink Shared Channel) based on the DCI (also known as UL grant, etc.).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “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

[0008] Problems to be solved by the invention

[0009] In a future wireless communication system (hereinafter referred to as NR), the use of beam forming (BF) for communication is being studied. Therefore, a user terminal is studying how to control reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) of a channel based on a state (TCI state) of a transmission configuration indication (TCI: Transmission Configuration Indication or Transmission Configuration Indicator) of the channel.

[0010] The TCI state is information related to the quasi-co-location (QCL) of a channel or signal, also known as a spatial reception parameter, etc. The TCI state is specified for each channel or each signal to the user terminal. The user terminal determines at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of each channel based on the TCI state specified for each channel. In addition, a field (also called a TCI field) specifying the TCI state is included in the DCI for scheduling the physical shared channel and notified to the UE.

[0011] However, when scheduling between different carriers (cross-carrier scheduling) is applied, how to control the interpretation of the TCI field in a carrier scheduled by the DCI of another carrier has not been fully studied. Or, when DCI is used to specify a bandwidth part (BWP) for sending and receiving channels or signals (for example, for switching, etc.), how to control the interpretation of the TCI field contained in the DCI has not been fully studied.

[0012] The present invention is completed in view of the above-mentioned problems, and one of its purposes is to provide a designated user terminal and a wireless communication method that can appropriately control the TCI state of the user terminal.

[0013] Means used to solve problems

[0014] The user terminal involved in one aspect of the present disclosure is characterized by comprising: a receiving unit, which receives downlink control information, wherein the downlink control information includes a field for specifying the state of a transmission structure indication (TCI); and a control unit, which determines the state of the TCI specified by the field based on at least one of a cell scheduled by the downlink control information and a bandwidth part (BWP) specified by the downlink control information.

[0015] Effects of the Invention

[0016] According to an aspect of the present disclosure, the designation of the TCI state for the user terminal may be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing an example of cross-carrier scheduling.

[0018] Figure 2 This is a diagram showing an example of setting the TCI field value for each cell.

[0019] Figure 3 This is a diagram showing another example of cross-carrier scheduling.

[0020] Figure 4 This diagram shows an example of a situation where the TCI field value is set separately for each BWP in a cell.

[0021] Figure 5 This is a diagram showing an example of BWP switching.

[0022] Figure 6 This is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment.

[0023] Figure 7 It is a diagram showing an example of the overall configuration of a wireless base station according to the present embodiment.

[0024] Figure 8 This is a diagram showing an example of a functional configuration of a wireless base station according to the present embodiment.

[0025] Fig. 9 This is a diagram showing an example of the overall configuration of a user terminal according to this embodiment.

[0026] Fig.10 This is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment.

[0027] Fig.11 This is a diagram showing an example of the hardware configuration of a wireless base station and a user terminal according to this embodiment. DETAILED DESCRIPTION

[0028] (TCI Status)

[0029] In NR, a study is underway to enable a user terminal to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) of a channel based on the state (TCI state) of the channel's transmission structure indication (TCI: Transmission Configuration Indication or Transmission Configuration Indicator).

[0030] Among them, the TCI state refers to information related to the quasi-co-location (QCL) of the channel or signal, also known as spatial reception parameters, spatial information, etc. The TCI state is specified for each channel or each signal to the user terminal. The user terminal can also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of each channel based on the TCI state specified for each channel.

[0031] The TCI state can also be identified by a specific identifier (TCI state ID (TCI-StateId)), and represents (contains) information related to the QCL of the channel / signal that is the object (or the reference signal used for the channel (or the antenna port of the reference signal)) and other signals (for example, other downlink reference signals (DL-RS: Downlink Reference Signal) or uplink reference signals (UL-RS: Uplink Reference Signal)) (QCL information (QCL-information)).

[0032] QCL (Quasi-Co-Location) refers to an indicator that represents the statistical properties of a channel / signal, also known as quasi-co-location. The UE can also control the reception processing or transmission processing of a specific channel / signal based on information (QCL information) related to the QCL of at least one of the channels and signals (channels / signals). The reception processing is equivalent to at least one of demapping, demodulation, and decoding. The transmission processing is equivalent to at least one of mapping, modulation, and coding.

[0033] For example, when a signal is in a QCL relationship with other signals, this means that it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (for example, Spatial Rx Parameter) is the same between these different multiple signals (at least one of these is QCL).

[0034] In addition, the spatial reception parameter may correspond to a receiving beam (e.g., a receiving analog beam) or a transmitting beam (e.g., a transmitting analog beam) of a user terminal, or the beam may be determined based on a spatial QCL. The QCL and at least one element of the QCL in the present disclosure may also be referred to as sQCL (Spatial QCL).

[0035] As far as QCL is concerned, multiple types (QCL types) can also be specified. For example, four different QCL types AD can be set in which the same parameters (or parameter sets) can be assumed, and these parameters are as follows:

[0036] QCL Type A: Doppler shift, Doppler spread, average delay and delay spread

[0037] QCL Type B: Doppler shift and Doppler spread

[0038] QCL Type C: Doppler shift and average delay

[0039] QCL Type D: Spatial Reception Parameters

[0040] The above-mentioned QCL-related information (QCL information, QCL-information) may also be specified for each channel. The QCL information of each channel may also include (or indicate) at least one of the following information:

[0041] Information indicating the above QCL type (QCL type information)

[0042] Information about the reference signal (RS) (RS information), which has a QCL relationship with each channel

[0043] Information indicating the carrier (cell) where the RS is located

[0044] Information indicating the bandwidth part (BWP) where the RS is located

[0045] Information indicating the spatial reception parameters (e.g. Rx beam) of each channel.

[0046] In addition, the channel whose TCI state is specified can also be at least one of the downlink shared channel (PDSCH: Physical Downlink Shared Channel), the downlink control channel (PDCCH: Physical Downlink Control Channel), the uplink shared channel (PUSCH: Physical Uplink Shared Channel), and the uplink control channel (PUCCH: Physical Uplink Control Channel).

[0047] In addition, the RS having a QCL relationship with the channel may be, for example, a synchronization signal block (SSB: Synchronization Signal Block) or a channel state information reference signal (CSI--RS: Channel Satate Information-Reference Signal). SSB is a signal block containing at least one of a primary synchronization signal (PSS: Primary Synchronization Signal), a secondary synchronization signal (SSS: secondary Synchronaization Signal), and a broadcast channel (PBCH: Physical Broadcast Channel).

[0048] <TCI status for PDCCH>

[0049] The TCI state for the PDCCH may also specify information related to the RS (e.g., resources of the RS), the RS having a QCL relationship with the PDCCH (or a demodulation reference signal (DMRS) of the PDCCH). The DMRS may also be referred to as an antenna port of the DMRS (DMRS port) or a group of the DMRS ports (DMRS port group), etc.

[0050] In the user terminal, one or more TCI states may be configured for each CORESET (Control Resource Set) through higher layer signaling. In addition, if one or more TCI states are configured for each CORESET, a single TCI state may be activated through MAC (Medium Access Control) signaling.

[0051] The high-layer signaling may be, for example, any one of RRC (Radio Resource Control) signaling and broadcast information, or a combination thereof. The broadcast information may be, for example, a master information block (MIB), a system information block (SIB), or minimum system information (RMSI). For MAC signaling, for example, a MAC control element (MACCE (Control Element)), a MAC PDU (Protocol Data Unit), etc. may also be used.

[0052] A CORESET may also be associated with a search space containing one or more PDCCH candidates. Each CORESET may also be associated with one or more search spaces. A user terminal may also monitor the search space to detect PDCCH (DCI).

[0053] A PDCCH candidate is a resource unit to which one PDCCH is mapped, and may be composed of, for example, a number of control channel elements (CCEs) corresponding to the aggregation level. The search space may also include a number of PDCCH candidates corresponding to the aggregation level.

[0054] In addition, in the present disclosure, "CORESET", "search space (or search space set)", "PDCCH candidate (or a set of more than one PDCCH candidates (PDCCH candidate set))", "downlink control channel (e.g., PDCCH)" and "downlink control information (DCI)" may also be renamed to each other. In addition, "monitoring" may also be renamed to "at least one of blind decoding and blind detection".

[0055] For example, the user terminal may also control the reception processing of the PDCCH based on the TCI state corresponding to the CORESET (or activated for the CORESET). Specifically, the user terminal may also conceive of using the same Tx beam as the RS specified by the TCI state to transmit for the reception processing of the PDCCH. In addition, the user terminal may also determine the spatial reception parameters (Rx beam) of the PDCCH based on the TCI state.

[0056] <TCI status for PDSCH>

[0057] The TCI state for PDSCH may also specify information related to the RS (eg, the resource of the RS), the RS having a QCL relationship with the PDSCH (or the DMRS of the PDSCH). The DMRS may also be renamed as a DMRS port or a DMRS port group.

[0058] The user terminal may also be notified (configured) of M (M ≥ 1) TCI states for PDSCH (M QCL information for PDSCH) through high-layer signaling. At least part of the M TCI states may also be activated through MAC signaling. The value of a specific field (e.g., TCI field) in the DCI for scheduling PDSCH may also represent one of the configured (or activated) TCI states.

[0059] The user terminal may also control the reception processing of the PDSCH based on the TCI state indicated by the specific field value in the DCI. Specifically, the user terminal may also assume that the same Tx beam as the RS specified by the TCI state is used to transmit the PDSCH reception processing. In addition, the user terminal may also determine the spatial reception parameters (Rx beam) of the PDSCH based on the TCI state.

[0060] The specific field (e.g., TCI field) in the DCI for specifying the TCI state is being studied for each control resource set (CORESET). For example, the network (e.g., base station) uses a specific field (e.g., tci-Present InDCI) included in the higher layer parameters (e.g., Control Resource Set) for setting the CORESET to control whether the TCI field is set in the DCI.

[0061] When the TCI field is set, a specific bit (e.g., 3 bits) of the TCI field is set in the DCI. In addition, in order to make the payload size of the DCI (e.g., DCI format 1_1) corresponding to multiple CORESETs consistent, 3 bits of zero padding can also be added to other CORESETs that do not use the TCI field.

[0062] The TCI field included in the DCI is used to specify the TCI state of the physical shared channel (e.g., PDSCH) scheduled by the DCI. For example, in the case where the PDSCH is scheduled through the DCI, the UE determines the TCI state applied to the PDSCH based on the TCI field value (specific bit value or specific code point) included in the DCI.

[0063] However, in NR, a method (also called cross-carrier scheduling) is supported to control the scheduling of physical shared channels (such as PDSCH) in other cells (such as the second cell) by using DCI sent in the first cell (refer to Figure 1 ).exist Figure 1 In this case, the PDSCH in the second cell (CC#1) is scheduled by the DCI sent in the first cell (CC#0). In this case, the first cell may also be referred to as a scheduling cell (scheduling cell), and the second cell may also be referred to as a scheduled cell (scheduled cell).

[0064] In addition, research is underway: In NR, it is assumed that multiple user terminals coexist in the supported bandwidth (various BWUE capabilities), so one or more partial frequency bands are semi-statically configured within the carrier. Each frequency band within the carrier (e.g., 50MHz or 200MHz, etc.) is called a partial frequency band or bandwidth part (BWP).

[0065] The activation or deactivation of the BWP can also be controlled. The activation of the BWP refers to the state in which the BWP can be used (or the state in which it is changed to the usable state), which is also called the activation or validation of the BWP configuration information (BWP configuration information). In addition, the deactivation of the BWP refers to the state in which the BWP cannot be used (or the state in which it is changed to the unusable state), which is also called the deactivation or invalidation of the BWP configuration information. The BWP is activated by scheduling the BWP.

[0066] For example, the UE may be configured with one or more BWPs for each cell, and the activated BWP may be controlled based on at least one of downlink control information and a timer. Such a switching operation of BWP activation and deactivation may also be referred to as BWP switching.

[0067] However, when cross-carrier scheduling between different carriers (cells or CCs) is applied, how to interpret the TCI field in the cell scheduled by DCI in different cells to determine the TCI state has not been fully studied. If the TCI field of DCI cannot be properly interpreted, the appropriate TCI state cannot be determined in cross-carrier scheduling, and the communication quality may deteriorate.

[0068] Alternatively, when BWP switching is applied, how to interpret the TCI field contained in the DCI that specifies the BWP switching to determine the TCI state of the PDSCH transmitted in the BWP after the switching has not been fully studied. If the TCI field of the DCI cannot be properly interpreted, the appropriate TCI state cannot be determined in the BWP switching, and the communication quality may deteriorate.

[0069] Therefore, the inventors of the present invention focused on the situation that when a physical shared channel is scheduled using a specific DCI, the cell or BWP that schedules the physical shared channel is changed, and conceived of controlling the interpretation of the TCI field included in a specific DCI based on at least one of the cell category (e.g., cell index) and BWP category (e.g., BWP index) scheduled by the specific DCI.

[0070] The present embodiment is described in detail below with reference to the accompanying drawings. Each of the methods shown below can be applied individually or in appropriate combination. In addition, in the following description, the TCI state for PDSCH will be described, but the present embodiment is not limited thereto. It can also be applied to the designation of the TCI state of other channels or signals (e.g., PUSCH, PDCCH, PUCCH, etc.).

[0071] (First aspect)

[0072] In the first aspect, if cross-carrier scheduling is supported (or configured), a value of a specific field (eg, TCI field) included in the DCI is interpreted based on a cell scheduled by the DCI.

[0073] When the PDSCH of a specific cell is scheduled through DCI, the UE interprets the TCI field included in the DCI based on the structure of the TCI state corresponding to the specific cell (e.g., configured for the specific cell). The structure of the TCI state (e.g., TCI-state configuration) may also be included in the PDSCH structure (PDSCH-Config) configured in the active BWP (e.g., active DLBWP) of the scheduled cell.

[0074] The base station may also set information related to the serving cell (e.g., ServingCellConfig) for the UE through high-layer signaling (e.g., RRC signaling). The information related to the serving cell may include information related to the BWP of DL (BWP-Downlink: BWP downlink). In addition, the information related to the BWP of DL may also include information related to the PDSCH structure sent in the BWP (pdsch-Config). In addition, the information related to the PDSCH structure may also include information related to the TCI state (e.g., candidates for the TCI state applied to the PDSCH).

[0075] When cross-carrier scheduling is set, the UE determines the cell in which the PDSCH is scheduled by the DCI based on the carrier identifier (CI: CarrierIndicator) field (CIF) contained in the DCI. For example, when the CIF value contained in the DCI sent by the first cell specifies the second cell, the UE receives the PDSCH scheduled in the second cell based on the DCI. In this case, the UE interprets the TCI field value of the DCI to determine a specific TCI state based on the structure of the TCI state set for the second cell (for example, the structure of the TCI state contained in the PDSCH structure set for the activation BWP of the second cell).

[0076] A table may also be set in which the candidate TCI states of the BWP (eg, activated BWP) for each cell and the TCI field value are pre-associated (see Figure 2 ).exist Figure 2 , an example of a table is shown, in which the TCI state is associated with the TCI field value (here 3 bits) for the activated BWP of cell A to cell D. In addition, here, for each TCI field value, the case where the TCI state with the same index is associated in each cell is shown, but it is not limited to this. It is also possible to set a TCI state with a different index for each cell.

[0077] Figure 3It shows the case where the first DCI (DCI#1) sent in cell A schedules (self-scheduling) the PDSCH in cell A, and the case where the second DCI (DCI#2) schedules (cross-carrier scheduling) the PDSCH in cell B. In addition, the first DCI and the second DCI may also be sent in a specific DCI format (e.g., DCI format 1_1).

[0078] The UE assumes that it receives the first DCI indicating the scheduling of the PDSCH in the activated BWP in the cell A. The UE determines that the cell in which the PDSCH is scheduled is the cell A based on the CIF included in the first DCI. In this case, the UE interprets the TCI field included in the first DCI based on the TCI state structure (e.g., the candidate of the TCI state) set for the BWP of the cell A in which the PDSCH is scheduled. That is, the UE interprets the TCI field to determine a specific TCI state based on the scheduled cell specified by the CIF.

[0079] Assume that the UE receives a second DCI indicating that a PDSCH in an activated BWP in cell B is scheduled. The UE determines that the cell in which the PDSCH is scheduled is cell B based on the CIF included in the second DCI. In this case, the UE interprets the TCI field included in the second DCI based on the TCI state structure (e.g., candidates for the TCI state) set for the BWP in cell B in which the PDSCH is scheduled. That is, the UE interprets the TCI field based on the scheduled cell specified by the CIF to determine a specific TCI state.

[0080] In this way, the TCI field of the DCI is interpreted based on the structure of the TCI state set in the scheduled cell (for example, the TCI state structure included in the PDSCH structure of the BWP for the cell). As a result, even in the case of cross-carrier scheduling, an appropriate TCI state can be applied to each scheduled cell. As a result, the degradation of communication quality can be suppressed.

[0081] In addition, the presence or absence of the TCI field in DCI format 0_1 ​​and DCI format 1_1 is set for each CORESET through high-layer signaling (for example, TCI-state enabled / disabled). The following assumption is made: in a CORESET where the TCI field is not set, the field is 0 bits long, and by performing zero padding of the 0-bit length, the payload size of TCI formats 0_1 and 1_1 in a CORESET where the TCI field is set is consistent with that of TCI formats 0_1 and 1_1 in a CORESET where the TCI field is not set.

[0082] It is assumed that in the PDCCH in the activated BWP of the scheduling cell, cross-carrier scheduling for the PDSCH in the activated BWP of different serving cells is set. In this case, if multiple TCI states are set to be activated for the PDSCH, one TCI state can be specified for the PDSCH as long as it is DCI format 1_1 set in the search space, which is mapped to the CORESET in which the TCI field is set. However, in the DCI format 1_1 set in the search space mapped to the CORESET in which the TCI field is not set, since the field is 0 bits long, the TCI state cannot be specified for the PDSCH. As a result, the UE may not be able to receive the PDSCH correctly.

[0083] Therefore, when the UE receives DCI based on a specific search space (for example, a search space corresponding to a CORESET in which the TCI field is not set), it can also control to apply a specific TCI state.

[0084] For example, consider a case where a PDSCH is scheduled across carriers, where multiple TCI states are activated by DCI format 1_1 set in a search space, and the search space is mapped to a CORESET in which the TCI field is not set. In this case, although the DCI format 1_1 does not include a TCI field, the UE may assume that the value of the TCI field is a specific value (e.g., 0), determine the TCI state of the PDSCH, and demodulate the PDSCH.

[0085] Alternatively, the UE may also assume that the PDSCH and a specific reference signal referenced by the UE in the scheduling cell (such as the SS / PBCH block selected in the initial access, the SS / PBCH block selected in the random access, or the CSI-RS) are QCL and perform demodulation.

[0086] In this way, the TCI state of the PDSCH or the reference signal that becomes QCL with the PDSCH can be properly identified, and the UE can correctly receive the PDSCH.

[0087] (Second aspect)

[0088] In the second aspect, when BWP switching using DCI is supported (or configured), the value of a specific field (eg, TCI field) included in the DCI is interpreted based on the BWP specified by the DCI (eg, the switched BWP or the activated BWP).

[0089] When a specific BWP (switching to a specific BWP) in a specific cell is specified by DCI, the UE interprets the TCI field included in the DCI based on the structure of the TCI state corresponding to the specific BWP (e.g., set for the specific BWP). The structure of the TCI state (e.g., TCI-state configuration) may also be included in the PDSCH structure (PDSCH-Config) set in the specific BWP of the specific cell.

[0090] The base station may also set information related to the serving cell (e.g., ServingCellConfig) for the UE through high-layer signaling (e.g., RRC signaling). The information related to the serving cell may also include information related to the BWP of the DL (BWP-Downlink: BWP downlink). In a specific cell (e.g., cell A), when multiple DL BWPs are set, the information of each BWP may also be included in the information related to the serving cell. In addition, the information related to each BWP may also include information related to the PDSCH structure sent in each BWP (pdsch-Config). In addition, the information related to the PDSCH structure may also include information related to the TCI state (e.g., candidates for the TCI state applied to the PDSCH).

[0091] When BWP switching is set, the UE determines the BWP used for the transmission of the PDSCH scheduled by the DCI based on the BWP identifier (BI: Bandwidth part Indicator) field (BIF) included in the DCI. For example, when the BIF value included in the DCI transmitted in the first BWP specifies the second BWP, the UE receives the PDSCH in the second BWP based on the DCI. In this case, the UE interprets the TCI field value of the DCI to determine a specific TCI state based on the structure of the TCI state set for the second BWP (for example, the structure of the TCI state included in the PDSCH structure set in the second BWP).

[0092] A table may also be set in advance to correspond the candidates of the TCI state for each BWP (for example, multiple BWPs set in a specific cell) to the TCI field value (refer to Figure 4 ). Figure 4, wherein the TCI state is associated with the TCI field value (here, 3 bits) for each BWP#A1-BWP#A4 set in cell A. In addition, here, it is shown that each TCI field value is associated with the TCI state with the same index in each BWP, but it is not limited to this. It is also possible to set a TCI state with a different index for each BWP.

[0093] Figure 5 The figure shows a case where the first DCI (DCI#1) sent in the first BWP#A1 of cell A schedules the PDSCH in the first BWP#A1, and the second DCI (DCI#2) specifies BWP#A2 (indicating BWP switching) and schedules the PDSCH in BWP#A2. In addition, the first DCI and the second DCI may also be sent in a specific DCI format (e.g., DCI format 1_1).

[0094] Consider the following situation: the UE receives the first DCI that specifies the first BWP#A1 of cell A and indicates the scheduling of the PDSCH in the BWP#A1. The UE determines that BWP#A1 becomes the activated BWP based on the BIF included in the first DCI. In this case, the UE interprets the TCI field included in the first DCI based on the TCI state structure (e.g., TCI candidate) set for BWP#A1 specified by the DCI. That is, the UE interprets the TCI field to determine a specific TCI state based on the BWP specified by the BIF.

[0095] Consider the following situation: the UE receives a second DCI that specifies the second BWP#A2 of cell A and indicates the scheduling of the PDSCH in the BWP#A2. The UE determines that BWP#A2 becomes the activated BWP (e.g., switched from BWP#A1 to BWP#A2) based on the BIF included in the second DCI. In this case, the UE interprets the TCI field included in the second DCI based on the TCI state structure (e.g., TCI candidate) set for BWP#A2 specified by the DCI. That is, the UE interprets the TCI field to determine a specific TCI state based on the BWP specified by the BIF.

[0096] In this way, the TCI field of the DCI is interpreted based on the TCI state structure set in the specific BWP specified by the DCI (for example, the TCI state structure included in the PDSCH structure for the specific BWP). As a result, even when switching using DCI BWP is performed, an appropriate TCI state can be applied for each BWP. As a result, it is possible to suppress the degradation of communication quality.

[0097] (Variation Example)

[0098] The first aspect and the second aspect may be applied in combination.

[0099] For example, when receiving DCI scheduling PDSCH, UE determines the specific cell where PDSCH is scheduled based on CIF included in the DCI. In addition, UE determines the specific BWP activated in the specific cell based on BIF included in the DCI.

[0100] In this case, the UE may also interpret the TCI field included in the DCI based on the TCI structure set for a specific BWP among multiple BWPs, and determine the TCI state to apply, wherein the multiple BWPs are BWPs set for a specific cell. That is, the UE may also determine the TCI state based on the CIF and BIF included in the DCI.

[0101] In this way, by determining the TCI state based on the CIF and BIF included in the DCI, the TCI state can be appropriately determined even when cross-carrier and BWP switching using DCI are set.

[0102] (Wireless Communication System)

[0103] The structure of the wireless communication system involved in this embodiment is described below. In the wireless communication system, communication is performed using any one or a combination of the wireless communication methods involved in the above embodiments of the present disclosure.

[0104] Figure 6 1 is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of component carriers (carriers or cells) can be applied.

[0105] In addition, the wireless communication system 1 can also be called LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., and can also be called a system that implements these.

[0106] The wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage area, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. In addition, a user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement and number of each cell and the user terminal 20 are not limited to those shown in the figure.

[0107] The user terminal 20 may be connected to both the base station 11 and the base station 12. It is assumed that the user terminal 20 uses CA or DC while using the macro cell C1 and the small cell C2. In addition, the user terminal 20 may use multiple cells (CCs) to apply CA or DC.

[0108] In addition, the wireless communication system 1 may also support dual connectivity between multiple RATs (Radio Access Technology) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE and NR (EN-DC: E-UTRA-NR Dual Connectivity, E-UTRA-NR Dual Connectivity) in which the LTE (E-UTRA) base station (eNB) becomes the master node (MN) and the NR base station (gNB) becomes the auxiliary node (SN), dual connectivity between NR and LTE (NE_DC: NR-E-UTRA Dual Connectivity) in which the NR base station (gNB) becomes the MN and the LTE (E-UTRA) base station (eNB) becomes the SN, etc. In addition, the wireless communication system 1 may also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity between both the MN and the SN and the NR base station (gNB) (NN--DC: NR-NR Dual Connectivity)).

[0109] A carrier with a lower frequency band (e.g., 2 GHz) and a narrower bandwidth (also referred to as an existing carrier, a legacy carrier, etc.) may be used for communication between the user terminal 20 and the base station 11. On the other hand, a carrier with a higher frequency band (e.g., 3.5 GHz, 5 GHz, etc.) and a wider bandwidth may also be used between the user terminal 20 and the base station 12, or the same carrier as that between the base stations 11 may be used. In addition, the configuration of the frequency band used by each base station is not limited thereto.

[0110] In addition, the user terminal 20 can communicate in each cell using time division duplex (TDD) and / or frequency division duplex (FDD). In addition, a single parameter set or a plurality of different parameter sets may be applied to each cell (carrier).

[0111] The so-called parameter set may be a communication parameter applied to the transmission and / or reception of a certain signal and / or channel, for example, it may indicate at least one of a subcarrier spacing, bandwidth, symbol length, cyclic prefix length, subframe length, TTI length, number of symbols per TTI, wireless frame structure, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc. For example, for a certain physical channel, if the subcarrier spacing of the configured OFDM symbols is different and / or the number of OFDM symbols is different, it may be said that the parameter set is different.

[0112] The base station 11 and the base station 12 (or two base stations 12 ) may be connected via wire (eg, optical fiber conforming to CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly.

[0113] The base station 11 and each base station 12 are respectively connected to the upper station device 30, and are connected to the core network 40 via the upper station device 30. In addition, the upper station device 30 includes, but is not limited to, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), etc. In addition, each base station 12 can also be connected to the upper station device 30 via the base station 11.

[0114] In addition, the base station 11 is a base station with a wide coverage range, and may also be referred to as a macro base station, a convergence node, an eNB (eNodeB), a transmission and reception point, etc. In addition, the base station 12 is a base station with a local coverage range, and may also be referred to as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission and reception point, etc. In the following, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0115] Each user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

[0116] In the wireless communication system 1 , as radio access schemes, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and / or OFDMA is applied to uplink.

[0117] OFDMA is a multi-carrier transmission method that divides the frequency band into multiple narrow frequency bands (subcarriers) and maps data to each subcarrier for communication. SC-FDMA is a single-carrier transmission method that divides the system bandwidth into frequency bands consisting of one or continuous resource blocks for each terminal, allowing multiple terminals to use different frequency bands to reduce interference between terminals. In addition, the uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods can also be used.

[0118] In the wireless communication system 1, as downlink channels, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, etc. shared by each user terminal 20 are used. User data, high-layer control information, SIB (System Informat Block), etc. are transmitted through PDSCH. In addition, MIB (Master Information Block) is transmitted through PBCH.

[0119] Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), etc. Downlink control information (DCI: Downlink Control Information: Downlink Control Information) including scheduling information of PDSCH and / or PUSCH is transmitted through PDCCH.

[0120] In addition, scheduling information may also be notified through DCI. For example, DCI for scheduling DL data reception may also be referred to as DL allocation, and DCI for scheduling UL data transmission may also be referred to as UL grant.

[0121] The number of OFDM symbols used for PDCCH is transmitted via PCFICH. The delivery confirmation information (e.g., also called retransmission control information, HARQ-ACK, ACK / NACK, etc.) for HARQ (Hybrid Automatic Repeat request) of PUSCH is transmitted via PHICH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel) and is used for the transmission of DCI, etc., in the same way as PDCCH.

[0122] In the wireless communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel), etc. shared by each user terminal 20 are used. User data, high-layer control information, etc. are transmitted through the PUSCH. In addition, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), etc. are transmitted through the PUCCH. A random access preamble code for establishing a connection with a cell is transmitted through the PRACH.

[0123] In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS: Cell-specific Reference Signal), a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal), a demodulation reference signal (DMRS: DeModulation Reference Signal), a positioning reference signal (PRS: Positioning Reference Signal), etc. are transmitted. In addition, in the wireless communication system 1, as reference signals, a sounding reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), etc. are transmitted. In addition, DMRS can be called a user terminal specific reference signal (UE-specific Reference Signal). In addition, the transmitted reference signal is not limited to this.

[0124] <Base Station>

[0125] Figure 7 1 is a diagram showing an example of the overall structure of a base station involved in this embodiment. The base station 10 has a plurality of transmit / receive antennas 101, an amplifier unit 102, a transmit / receive unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. In addition, the transmit / receive antennas 101, the amplifier unit 102, and the transmit / receive unit 103 can be configured to include one or more, respectively.

[0126] User data transmitted from the base station 10 to the user terminal 20 via a downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106 .

[0127] In the baseband signal processing unit 104, for user data, transmission processing such as PDCP (Packet Data Convergence Protocol) layer processing, user data segmentation / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access Control) retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing and other transmission processing are performed, and the data is transferred to the transmission and reception unit 103. In addition, for downlink control signals, transmission processing such as channel coding and inverse fast Fourier transform are also performed, and the data is transferred to the transmission and reception unit 103.

[0128] The transmitting and receiving unit 103 converts the baseband signal output by precoding each antenna from the baseband signal processing unit 104 into a wireless frequency band for transmission. The wireless frequency signal after the frequency conversion by the transmitting and receiving unit 103 is amplified by the amplifier unit 102 and transmitted from the transmitting and receiving antenna 101. The transmitting and receiving unit 103 can be composed of a transmitter / receiver, a transmitting and receiving circuit, or a transmitting and receiving device described based on the public knowledge in the technical field involved in the present disclosure. In addition, the transmitting and receiving unit 103 can be composed of an integrated transmitting and receiving unit, or can be composed of a transmitting unit and a receiving unit.

[0129] On the other hand, regarding the uplink signal, the radio frequency signal received by the transmitting / receiving antenna 101 is amplified by the amplifier unit 102. The transmitting / receiving unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmitting / receiving unit 103 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

[0130] In the baseband signal processing unit 104, the user data included in the input uplink signal is subjected to fast Fourier transform (FFT: Fast Fourier Transform) processing, inverse discrete Fourier transform (IDFT: InverseDiscrete Fourier Transform) processing, error correction decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing, and is transferred to the upper station device 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of wireless resources, etc.

[0131] The transmission path interface 106 sends and receives signals via a specific interface to the upper station device 30. In addition, the transmission path interface 106 may send and receive signals (return signaling) to other base stations 10 via an inter-base station interface (e.g., an optical fiber or an X2 interface conforming to CPRI (Common Public Radio Interface)).

[0132] Figure 8 1 is a diagram showing an example of a functional configuration of a base station according to the present embodiment. In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it is also possible to assume that the base station 10 also has other functional blocks necessary for wireless communication.

[0133] The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generating unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. In addition, these structures may be included in the base station 10, or a part or all of the structures may not be included in the baseband signal processing unit 104.

[0134] The control unit (scheduler) 301 implements overall control of the base station 10. The control unit 301 may be composed of a controller, a control circuit, or a control device described based on the common knowledge in the technical field to which the present disclosure relates.

[0135] The control unit 301 controls, for example, signal generation in the transmission signal generating unit 302 , signal allocation in the mapping unit 303 , etc. In addition, the control unit 301 controls signal reception processing in the reception signal processing unit 304 , signal measurement in the measuring unit 305 , and the like.

[0136] The control unit 301 controls the scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals sent via PDSCH), and downlink control signals (e.g., signals sent via PDCCH and / or EPDCCH, delivery confirmation information, etc.). In addition, the control unit 301 controls the generation of downlink control signals, downlink data signals, etc. based on the result of determining whether retransmission control of uplink data signals is required.

[0137] The control unit 301 controls the scheduling of synchronization signals (eg, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (eg, CRS, CSI-RS, DMRS), and the like.

[0138] The control unit 301 controls the scheduling of uplink data signals (e.g., signals sent via PUSCH), uplink control signals (e.g., signals sent via PUCCH and / or PUSCH, delivery confirmation information, etc.), random access preamble codes (e.g., signals sent via PRACH), uplink reference signals, etc.

[0139] The transmission signal generating unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on the instruction from the control unit 301, and outputs it to the mapping unit 303. The transmission signal generating unit 302 can be composed of a signal generator, a signal generating circuit or a signal generating device described based on the public knowledge in the technical field involved in the present disclosure.

[0140] The transmission signal generating unit 302 generates, for example, a DL allocation for notifying allocation information of downlink data and / or a UL grant for notifying allocation information of uplink data based on an instruction from the control unit 301. Both the DL allocation and the UL grant are DCI and follow the DCI format. In addition, the downlink data signal is coded and modulated according to a coding rate and a modulation method determined based on channel state information (CSI: Channel State Information) from each user terminal 20.

[0141] Based on the instruction from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a specific wireless resource, and outputs it to the transmission and reception unit 103. The mapping unit 303 can be composed of a mapper, a mapping circuit or a mapping device described based on the public knowledge in the technical field involved in the present disclosure.

[0142] The received signal processing unit 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting and receiving unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) sent from the user terminal 20. The received signal processing unit 304 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the public knowledge in the technical field involved in the present disclosure.

[0143] The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, the HARQ-ACK is output to the control unit 301. In addition, the reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.

[0144] The measurement unit 305 performs measurements related to the received signal and can be composed of a measurer, a measurement circuit or a measurement device described based on the common knowledge in the technical field involved in the present disclosure.

[0145] For example, the measuring unit 305 may also perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, etc. based on the received signal. The measuring unit 305 may measure received power (e.g., RSRP (Reference Signal Received Power), received quality (e.g., RSRQ (Reference Signal Received Quality), SINR (signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement result may be output to the control unit 301.

[0146] In addition, the transmitting and receiving unit 103 transmits downlink control information including a field specifying the state of the transmission structure indication (TCI). In addition, the transmitting and receiving unit 103 may also transmit information related to the structure of the TCI state (e.g., TCI state candidate) corresponding to the TCI field value included in the DCI to the UE for each cell.

[0147] The control unit 301 may control the setting of at least one of a cell group, a cell, a BWP, a CORESET, a search space, and a cross-carrier scheduling, and control the transmission of setting information of at least one of these.

[0148] The control unit 301 controls the TCI field value based on at least one of the cell scheduled by the downlink control information and the bandwidth part (BWP) specified by the downlink control information. For example, the control unit 301 may also control the determination of the state of the TCI specified by the TCI field based on at least one of the carrier identifier (CI) and the BWP identifier (BI) included in the downlink control information.

[0149] The control unit 301 may also perform control so that a candidate for the state of TCI specified by the TCI field is set for each cell. In addition, the control unit 301 may also perform control so that a candidate for the state of TCI specified by the TCI field is set for each cell.

[0150] <User Terminal>

[0151] Fig. 92 is a diagram showing an example of the overall structure of a user terminal involved in this embodiment. The user terminal 20 includes a plurality of transmit / receive antennas 201, an amplifier unit 202, a transmit / receive unit 203, a baseband signal processing unit 204, and an application unit 205. In addition, the transmit / receive antennas 201, the amplifier unit 202, and the transmit / receive unit 203 may be configured to include one or more.

[0152] The radio frequency signal received by the transmitting and receiving antenna 201 is amplified by the amplifier unit 202. The transmitting and receiving unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmitting and receiving unit 203 converts the received signal frequency into a baseband signal and outputs it to the baseband signal processing unit 204. The transmitting and receiving unit 203 can be composed of a transmitter / receiver, a transmitting and receiving circuit, or a transmitting and receiving device described based on the public knowledge in the technical field involved in the present disclosure. In addition, the transmitting and receiving unit 203 can be composed of an integrated transmitting and receiving unit, or a transmitting unit and a receiving unit.

[0153] The baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing of retransmission control, etc. on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer, etc. In addition, the broadcast channel information is also transferred to the application unit 205 in the downlink user data.

[0154] On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. In the baseband signal processing unit 204, transmission processing of retransmission control (for example, transmission processing of HARQ), channel coding, precoding, discrete Fourier transform (DFT: Discrete Fourier Transform) processing, IFFT processing, etc. are performed, and then transferred to the transmission and reception unit 203.

[0155] The transmitting and receiving unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits the converted radio frequency signal. The radio frequency signal after the frequency conversion by the transmitting and receiving unit 203 is amplified by the amplifier unit 202 and transmitted from the transmitting and receiving unit 201.

[0156] Fig.10 1 is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment. In addition, in this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it is also assumed that the user terminal also has other functional blocks required for wireless communication.

[0157] The baseband signal processing unit 204 of the user terminal 20 includes at least a control unit 401, a transmission signal generating unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. In addition, these structures may be included in the user terminal 20, or a part or all of the structures may not be included in the baseband signal processing unit 204.

[0158] The control unit 401 implements overall control of the user terminal 20. The control unit 401 may be composed of a controller, a control circuit, or a control device described based on the common knowledge in the technical field involved in the present disclosure.

[0159] The control unit 401 controls, for example, signal generation in the transmission signal generating unit 402 , signal allocation in the mapping unit 403 , etc. In addition, the control unit 401 controls signal reception processing in the reception signal processing unit 404 , signal measurement in the measuring unit 405 , and the like.

[0160] The control unit 401 obtains the downlink control signal and the downlink data signal sent from the base station 10 from the received signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining whether retransmission control of the downlink control signal and / or the downlink data signal is required.

[0161] The control unit 401 controls the monitoring of DCI that is CRC-scrambled by a specific identifier (e.g., at least one of C-RNTI, CS-RNTI, MCS-C-RNTI, SI-RNTINP-RNTI, RA-RNTI, TC-RNTI, INT-RNTI, SFI-RNTI, TPC--RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, SP-CSI-RNTI).

[0162] In addition, when the control unit 401 acquires various information notified from the base station 10 from the received signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

[0163] The transmission signal generating unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on the instruction from the control unit 401, and outputs it to the mapping unit 403. The transmission signal generating unit 402 can be composed of a signal generator, a signal generating circuit or a signal generating device described based on the public knowledge in the technical field involved in the present disclosure.

[0164] The transmission signal generating unit 402 generates, for example, an uplink control signal related to delivery confirmation information, channel state information (CSI), etc. based on an instruction from the control unit 401. In addition, the transmission signal generating unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, when the downlink control signal notified from the base station 10 includes a UL grant, the transmission signal generating unit 402 is instructed by the control unit 401 to generate an uplink data signal.

[0165] Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generating unit 402 to the wireless resource and outputs it to the transmitting and receiving unit 203. The mapping unit 403 may be composed of a mapper, a mapping circuit or a mapping device described based on the common knowledge in the technical field involved in the present disclosure.

[0166] The received signal processing unit 404 performs receiving processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting and receiving unit 203. The received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) sent from the base station 10. The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the public knowledge in the technical field involved in the present disclosure. In addition, the received signal processing unit 404 can constitute the receiving unit involved in the present disclosure.

[0167] The received signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The received signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to the control unit 401. In addition, the received signal processing unit 404 outputs the received signal and / or the received processed signal to the measurement unit 405.

[0168] The measurement unit 405 performs measurements related to the received signal and can be composed of a measurer, a measurement circuit or a measurement device described based on the common knowledge in the technical field involved in the present disclosure.

[0169] For example, the measuring unit 405 may also perform RRM measurement, CSI measurement, etc. based on the received signal. The measuring unit 405 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement result may also be output to the control unit 401.

[0170] In addition, the transmitting and receiving unit 203 receives downlink control information including a field specifying the state of the transmission structure indication (TCI). In addition, the transmitting and receiving unit 103 can also receive information related to the structure of the TCI state (e.g., TCI state candidate) corresponding to the TCI field value of each cell.

[0171] The control unit 401 may also control the setting of at least one of a cell group, a cell, a BWP, a CORESET, a search space, and a cross-carrier scheduling, and control the reception of setting information of at least one of these.

[0172] The control unit 401 may also control the interpretation of the TCI field based on at least one of the cell scheduled by the downlink control information and the bandwidth part (BWP) specified by the downlink control information, thereby determining the state of the TCI specified by the TCI field. For example, the control unit 401 may also control the interpretation of the state of the TCI specified by the TCI field based on at least one of the carrier identifier (CI) and the BWP identifier (BI) included in the downlink control information.

[0173] The control unit 401 may also assume that the candidate state of the TCI specified by the TCI field is set for each cell, and the TCI state is determined based on the CI. In addition, the control unit 401 may also assume that the candidate state of the TCI specified by the TCI field is set for each BWP, and the TCI state is determined based on the BI.

[0174] <Hardware Structure>

[0175] In addition, the block diagram used in the description of the above-mentioned embodiments shows the blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a device that is physically or logically coupled, or each functional module can be implemented by directly or indirectly (for example, using wired, wireless, etc.) connecting more than two physically or logically separated devices and using these multiple devices. Functional blocks can also be implemented by combining software with the above-mentioned device or the above-mentioned multiple devices.

[0176] Among them, the functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, informing (broadcasting), notifying, communicating (communicating), forwarding (forwarding), configuring (configuring), reconfiguring (reconfiguring), allocating (allocating, mapping), assigning (assigning), etc., but are not limited to these. For example, a functional block (component) that plays a sending role can also be called a transmitting unit (transmitting unit), a transmitter (transmitter), etc. Any one, as mentioned above, the implementation method is not particularly limited.

[0177] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may be used as a computer for executing the processing of the wireless communication method of the present disclosure. Fig.11 1 is a diagram showing an example of a hardware structure of a base station and a user terminal involved in an embodiment. The base station 10 and the user terminal 20 can be physically configured as a computer device, and the computer device includes 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.

[0178] In addition, in the present disclosure, the words device, circuit, equipment, section, unit, etc. can be interchangeable. The hardware structure of the base station 10 and the user terminal 20 can be configured to include one or more of the devices shown in the figure, or can be configured to exclude some of the devices.

[0179] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, and the processing may be performed by more than two processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may be implemented by more than one chip.

[0180] The functions in the base station 10 and the user terminal 20 are implemented in the following manner: for example, specific software (program) is read into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the memory 1003.

[0181] The processor 100 controls the entire computer by, for example, operating an operating system. The processor 1001 may be composed of a central processing unit (CPU), which includes an interface with peripheral devices, a control device, a computing device, a register, etc. For example, the baseband signal processing unit 104 (204), the call processing unit 105, etc. may also be implemented by the processor 1001.

[0182] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes according to them. As the program, a program that causes the computer to perform at least a part of the operations described in the above embodiment is used. For example, the control unit 401 of the user terminal 20 can be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the other functional blocks can also be implemented in the same way.

[0183] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc., and the program may be executed to implement the wireless communication method involved in one embodiment of the present disclosure.

[0184] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of a flexible disk, a floppy disk, an optical disk (such as a compact disk (CD-ROM (Compact Disc ROM: Compact Disc Read-Only Memory)), a digital versatile disk, a Blu-ray (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. The memory 1003 may also be referred to as an auxiliary storage device.

[0185] The communication device 1004 is hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, etc. The communication device 1004 is configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and / or time division duplex (TDD: Time Division Duplex). For example, the above-mentioned transmitting and receiving antenna 101 (201), amplifier unit 102 (202), transmitting and receiving unit 103 (203), transmission path interface 106, etc. may be implemented by the communication device 1004. The transmitting and receiving unit 103 (203) may be implemented by physically or logically separating the transmitting unit 103a (203a) and the receiving unit 103b (203b).

[0186] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED (Light Emitting Diode) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0187] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for information communication. The bus 1007 may be configured using a single bus or different buses may be used between the devices.

[0188] 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 ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and the like, and the hardware may be used to implement a part or all of each functional module. For example, the processor 1001 may be implemented using at least one of the hardware.

[0189] (Variation Example)

[0190] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol and signal (signal or signaling) may be renamed one another. In addition, a signal may be a message. A reference signal may also be referred to as RS (Reference Signal) for short, and may be referred to as a pilot, a pilot signal, etc. according to the applied standard. In addition, a component carrier (CC) may be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0191] A radio frame may be composed of one or more time periods (frames) in the time domain. Each of the one or more time periods (frames) constituting a radio frame may be referred to as a subframe. Moreover, a subframe may be composed of one or more time slots in the time domain. A subframe may be a fixed duration (e.g., 1 ms) that is independent of a parameter set (numerology).

[0192] The parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, indicate at least one of the subcarrier spacing (SCS) bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, the radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

[0193] A time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. In addition, a time slot can be a time unit based on a parameter set.

[0194] A time slot may include multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit greater than a mini-slot may be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (PUSCH) mapping type B.

[0195] 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 may be referred to by other names corresponding to each other. In addition, time units such as frames, subframes, time slots, mini-time slots and symbols in the present disclosure may be referred to by different names.

[0196] For example, a subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, and a time slot or a mini time slot may be called a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing TTI may also be called a time slot, a mini time slot, etc., instead of a subframe.

[0197] TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal, and the scheduling allocates wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in units of TTI. In addition, the definition of TTI is not limited to this.

[0198] TTI can be a transmission time unit of a data packet (transport block), code block, code word, etc. after channel coding, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) for actually mapping a transport block, code block, code word, etc. can be shorter than the TTI.

[0199] In addition, when a time slot or a mini time slot is referred to as TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can be the minimum time unit of scheduling. In addition, the number of time slots (the number of mini time slots) constituting the minimum time unit of the scheduling can be controlled.

[0200] A TTI with a duration of 1 ms may be referred to as a normal TTI (TTI in LTE Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc.

[0201] In addition, long TTI (e.g., normal TTI, subframe, etc.) can be renamed as TTI with a duration exceeding 1 ms, and short TTI (e.g., shortened TTI, etc.) can be renamed as TTI with a TTI length shorter than that of long TTI and longer than 1 ms.

[0202] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers contained in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers contained in an RB may be determined based on the parameter set.

[0203] In addition, in the time domain, an RB may include one or more symbols, and may also be the length of a time slot, a mini-time slot, a subframe, or a TTI. One TTI, one subframe, etc. may also be composed of one or more resource blocks, respectively.

[0204] In addition, one or more RBs may be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like.

[0205] In addition, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0206] A bandwidth part (BWP) (also called partial bandwidth, etc.) in a carrier may represent a subset of contiguous common RBs (common resource blocks) for a parameter set. Common RBs may be identified by the index of the RB relative to the common reference point of the carrier. PRBs may also be defined by a BWP and numbered within the BWP.

[0207] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for a UE within one carrier.

[0208] At least one of the set BWPs may be activated, and it may not be assumed that the UE transmits / receives a specific signal / channel outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be referred to as "BWP".

[0209] In addition, the above structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, and the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP: Cyclic Prefix) length can be variously changed.

[0210] In addition, the information / parameters described in the present disclosure may be represented by absolute values, relative values ​​of specific values, or other corresponding information. For example, wireless resources may also be indicated by specific indexes.

[0211] In the present disclosure, the names used for parameters, etc. are not restrictive names in any respect. Furthermore, the mathematical formulas, etc. using these parameters may be different from the mathematical formulas, etc. explicitly disclosed in the present disclosure. Since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements may be identified by any suitable names, the various names assigned to these various channels and information elements are not restrictive names in any respect.

[0212] The information, signals, etc. described in the present disclosure may be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, code elements, chips, etc. that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0213] In addition, information, signals, etc. can be at least one of output from a high level to a low level and output from a low level to a high level. Information, signals, etc. can be input / output through a plurality of network nodes.

[0214] The input / output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input / output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may be deleted. The input information, signals, etc. may be sent to other devices.

[0215] Information notification is not limited to the aspects / implementations described in the present disclosure and may be performed using other methods. For example, information notification is implemented through physical layer signaling (e.g., downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), high-layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

[0216] In addition, physical layer signaling may be referred to as L1 / L2 (layer 1 / layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may be referred to as an RRC message, for example, an RRC connection setup message, an RRC connection reconfiguration message, etc. In addition, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

[0217] In addition, notification of specific information (for example, notification of "It is X") is not limited to displayed notification, and may be performed implicitly (for example, by not notifying the specific information or by notifying other information).

[0218] The determination may be made using a value represented by 1 bit (0 or 1), a true or false value (boolean) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0219] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be interpreted broadly as command, command set, code, code segment, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0220] In addition, software, commands, information, etc. can be sent and received via transmission media. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission media.

[0221] The terms "system" and "network" used in this disclosure may be used interchangeably.

[0222] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "TCI state (Transmission Configuration Indication state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "level", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel" and the like may be used interchangeably.

[0223] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes the terms such as macro cell, small cell, femto cell, pico cell and the like are used to refer to the base station.

[0224] A base station can accommodate one or more (for example, 3) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which can be provided with communication services by a base station subsystem (for example, a small base station (RRH: Remote Radio Head) for indoor use). The term "cell" or "sector" refers to a partial or full coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within this coverage area.

[0225] In the present disclosure, the terms “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, “terminal” and the like may be used interchangeably.

[0226] A mobile station is sometimes referred to as a user station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile user station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client or some other suitable terminology.

[0227] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0228] In addition, the base station in the present disclosure may be renamed as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a wireless base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, it may also be configured that the user terminal 20 has the functions possessed by the above-mentioned wireless base station 10. In addition, words such as "uplink" and "downlink" may also be renamed as words corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be renamed as a side channel.

[0229] Likewise, the user terminal in the present disclosure may be referred to as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0230] In the present disclosure, the operations performed by the base station may be performed by its upper node in some cases. Obviously, in a network including one or more network nodes having a base station, various operations for communicating with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these), or a combination thereof.

[0231] The various aspects / implementations described in this disclosure may be used alone, in combination, or switched as the execution progresses. In addition, the order of the processing procedures, timings, flow charts, etc. of the various aspects / implementations described in this disclosure may be changed as long as there is no conflict. For example, the method described in this disclosure uses an exemplary order to present elements of various steps and is not limited to the specific order presented.

[0232] The various aspects / embodiments described in the present disclosure may be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE802.11 (Wi-Fi (registered trademark)), IEEE802.16 (WiMAX (registered trademark)), IEEE802.20, UWB (Ultra-Wide Band), Band: ultra-wideband), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on their expansion, etc. In addition, multiple systems may be applied in combination (for example, LTE or LTE-A, and a combination with 5G, etc.).

[0233] The description “based on” used in the present disclosure does not mean “only based on” unless otherwise specified. In other words, the description “based on” means both “only based on” and “at least based on”.

[0234] Any reference to elements using the "first", "second" or the like used in the present disclosure will not limit the number or order of these elements in an all-round manner. These titles can be used in the present disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first element and the second element does not mean that only two elements can be used, or that the first element must precede the second element in some form.

[0235] The term "determining" as used in this disclosure sometimes includes various operations. For example, "determining" can be considered as "judging", calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database or other data structure), ascertaining, etc.

[0236] In addition, "judgment (decision)" can be regarded as "judgment (decision)" on receiving (e.g., receiving information), transmitting (e.g., sending information), input (input), output (output), accessing (e.g., accessing data in a memory), etc.

[0237] In addition, "judgment (decision)" can be regarded as "judgment (decision)" on resolving (resolving), selecting (selecting), choosing (choosing), establishing (establishing), comparing (comparing), etc. That is, "judgment (decision)" can be regarded as "judgment (decision)" on any operation.

[0238] In addition, “judgment (decision)” can also be rephrased as “assuming (assuming)”, “expecting (expecting)”, “considering (considering)”, etc.

[0239] The “maximum transmit power” described in the present disclosure may refer to the maximum value of the transmit power, or may refer to the nominal UE maximum transmit power, or may refer to the nominal UE maximum transmit power (the nominal UE maximum transmit power) or the rated UE maximum transmit power (the rated UE maximum transmit power).

[0240] The terms "connected" and "coupled" or all variations thereof used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may also be referred to as "access".

[0241] In the present disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to each other using one or more wires, cables, printed electrical connections, etc., and as some non-limiting or non-inclusive examples, using electromagnetic energy having a wavelength in the radio frequency domain, microwave domain, optical (both visible and invisible) region, etc.

[0242] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." In addition, the term may mean "A and B are different from C, respectively." Terms such as "separate," "coupled," etc. may also be interpreted similarly to "different."

[0243] In the present disclosure, when the terms "include", "including" and their variations are used, these terms are intended to be inclusive like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0244] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may include a case where the noun following the article is in plural form.

[0245] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modification and alteration without departing from the subject matter and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and has no limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: a receiving unit, receiving, in the case of cross-carrier scheduling, a high-layer signaling, which sets a transmission structure indication field (TCI field) in the downlink control information of DCI format 1_1 for the control resource set CORESET, and receiving the downlink control information including the TCI field, which is transmitted in the first cell and schedules the physical downlink shared channel (PDSCH) of the second cell; and A control unit, which determines, based on the TCI field, a TCI state applied to the PDSCH from among the candidates for the TCI state set in the second cell.

2. The terminal according to claim 1, The candidates for the TCI state set in the second cell are included in the PDSCH structure information set through high-layer signaling.

3. The terminal according to claim 2, The PDSCH structure information is set for the BWP of the second cell.

4. A wireless communication method of a terminal, comprising: In case of cross-carrier scheduling, a high-layer signaling is received, wherein the high-layer signaling sets a step of providing a transmission structure indication field, namely, a TCI field, in downlink control information of a control resource set CORESET in a DCI format 1_1; The step of receiving the downlink control information including the TCI field, which is sent in the first cell and schedules the physical downlink shared channel (PDSCH) of the second cell; as well as A step of determining, based on the TCI field, a TCI state applied to the PDSCH from candidates of the TCI state set in the second cell.

5. A base station, comprising: a transmitting unit, in case of cross-carrier scheduling, transmitting a high-layer signaling, wherein the high-layer signaling sets a transmission structure indication field (TCI field) in the downlink control information of the DCI format 1_1 for the control resource set CORESET, and transmitting the downlink control information including the TCI field, which is transmitted in the first cell and schedules the physical downlink shared channel (PDSCH) of the second cell; and A control unit that uses the TCI field to specify a TCI state to be applied to the PDSCH from among candidates of the TCI state set in the second cell.

6. A system comprising a base station and a terminal, The base station has: a sending unit, in the case of cross-carrier scheduling, sending a high-layer signaling, wherein the high-layer signaling sets the control resource set CORESET to have a transmission structure indication field, i.e., a TCI field, in the downlink control information of the DCI format 1_1, and sends the downlink control information including the TCI field, which is sent in the first cell and schedules the physical downlink shared channel, i.e., the PDSCH, of the second cell, The terminal has: a receiving unit, configured to receive the high-layer signaling and the downlink control information; and A control unit, which determines, based on the TCI field, a TCI state applied to the PDSCH from among the candidates for the TCI state set in the second cell.

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