Terminal, wireless communication method and system

Abstract

A terminal involved in one embodiment of the present invention comprises: a receiving unit, which receives a MAC control element (i.e., a MAC CE) that can specify multiple transmission setting indication states (i.e., TCI states) for a control resource set; and a control unit, which controls the reception of downlink control information sent from multiple transmission points using the same control resource set based on the MAC CE.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

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

[0004] Prior art literature

[0005] Non-patent literature

[0006] 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

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (e.g., NR), it is envisioned that a beam transmitted from a transmission point (e.g., a remote radio head (RRH)) arranged on a path of a moving object (e.g., a train) will be used to achieve wireless communication in a high-speed moving object (e.g., a train).

[0009] However, how to control wireless communications in a mobile object using beams transmitted from various transmission points has not yet been fully studied.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately control wireless communication even when using a mobile object.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present disclosure is characterized in that it comprises: a receiving unit for receiving a MAC control element, i.e., a MAC CE, which can specify multiple transmission setting indication states, i.e., TCI states, for a control resource set; and a control unit for controlling, based on the MAC CE, the reception of downlink control information sent from multiple transmission points using the same control resource set.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, wireless communication can be appropriately controlled even when using a mobile object. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1A as well as Figure 1B This is a diagram showing an example of communication between a mobile object and a transmission point.

[0016] Figure 2 This is a diagram showing an example of time scaling between TRPs.

[0017] Figure 3 This is a diagram showing an example of MAC CE used in notification of TCI status.

[0018] Figure 4 This is a diagram showing another example of communication between a mobile object and a transmission point.

[0019] Figure 5A as well as Figure 5B This is a diagram showing an example of PDCCH (or DCI) transmission and reception between a terminal and a transmission point.

[0020] Figure 6A as well as Figure 6B This is a diagram showing an example of a MAC CE according to the first embodiment.

[0021] Figure 7A as well as Figure 7B This is a diagram showing an example of communication control between a terminal and a transmission point according to the third embodiment.

[0022] Figure 8This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0023] Figure 9 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0024] Figure 10 This is a diagram showing an example of the configuration of a user terminal according to an embodiment.

[0025] Figure 11 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0026] (TCI, spatial relationship, QCL)

[0027] In NR, research is underway to control the reception processing (e.g., at least one of reception, demapping, demodulation, and decoding) and transmission processing (e.g., at least one of transmission, mapping, precoding, modulation, and encoding) of at least one of a signal and a channel (expressed as signal / channel) in the UE based on the transmission configuration indication state (TCI state).

[0028] The TCI state may also indicate the state of a signal / channel applied to a downlink. A state equivalent to the TCI state applied to a signal / channel applied to an uplink may also be expressed as a spatial relation.

[0029] The TCI status is information related to Quasi-Co-Location (QCL) of signals / channels and may also be referred to as spatial reception parameters, spatial relation information, etc. The TCI status may be set for each channel or each signal for the UE.

[0030] QCL is an indicator of the statistical properties of a signal / channel. For example, it can mean that when a signal / channel is in a QCL relationship with other signals / channels, it can be assumed that at least one of the Doppler shift, Doppler spread, average delay, delay spread, and spatial parameters (e.g., spatial Rx parameters) is the same among these different signals / channels (at least one of which is QCL).

[0031] In addition, the spatial reception parameter may also correspond to the UE's receive beam (e.g., receive analog beam), and the beam may also be determined based on spatial QCL. The QCL (or at least one element of QCL) in this disclosure may also be replaced with sQCL (spatial QCL).

[0032] Multiple types (QCL types) may be specified for QCLs. For example, four QCL types AD may be provided, and parameters (or parameter sets) that can be assumed to be the same in these four QCL types AD are different. These parameters (also referred to as QCL parameters) are expressed as follows:

[0033] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0034] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0035] QCL type C (QCL-C): Doppler shift and average delay,

[0036] QCL type D (QCL-D): spatial reception parameters.

[0037] The situation where the UE assumes that a specific control resource set (CORESET), channel or reference signal is in a specific QCL (e.g., QCL type D) relationship with other CORESETs, channels or reference signals can also be called QCL assumption.

[0038] The UE may also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) of the signal / channel based on the TCI status or QCL assumption of the signal / channel.

[0039] The TCI status may also be information related to the QCL between the target channel (in other words, the reference signal (RS) used for the channel) and other signals (for example, other RSs). The TCI status may also be set (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0040] In the present disclosure, the higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0041] MAC signaling may also use, for example, MAC Control Element (MAC CE) and MAC Protocol Data Unit (MAC PDU). Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), and Other System Information (OSI).

[0042] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI))).

[0043] The channel for which the TCI state or spatial relationship is set (specified) may be, for example, at least one of a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and an uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0044] In addition, the RS that has a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a tracking CSI-RS (also called a tracking reference signal (TRS)), and a QCL detection reference signal (also called QRS).

[0045] The SSB is a signal block that includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). The SSB may also be referred to as an SS / PBCH block.

[0046] The TCI state information element (RRC's "TCI-state IE") set through high-layer signaling may also include one or more pieces of QCL information ("QCL-Info"). The QCL information may also include at least one of information related to the RS that forms a QCL relationship (RS relationship information) and information indicating the QCL type (QCL type information). The RS relationship information may also include information such as the RS index (e.g., SSB index, non-zero-power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), the index of the cell where the RS is located, and the index of the bandwidth part (Bandwidth Part (BWP)) where the RS is located.

[0047] In Rel.15NR, as a TCI state of at least one of PDCCH and PDSCH, both RS of QCL type A and RS of QCL type D or only RS of QCL type A can be set to the UE.

[0048] When TRS is configured as the RS of QCL Type A, it is assumed that the TRS is different from the demodulation reference signal (DMRS) of PDCCH or PDSCH, and the same TRS is periodically transmitted for a long time. The UE can measure the TRS and calculate the average delay, delay spread, etc.

[0049] A UE in which the TRS is configured as a QCL Type A RS in the TCI state of the DMRS of a PDCCH or PDSCH can assume that the parameters of the QCL Type A of the DMRS of the PDCCH or PDSCH and the TRS (average delay, delay spread, etc.) are the same. Therefore, the parameters of the Type A of the DMRS of the PDCCH or PDSCH (average delay, delay spread, etc.) can be calculated based on the measurement results of the TRS. When performing channel estimation for at least one of the PDCCH and PDSCH, the UE can use the measurement results of the TRS to perform more accurate channel estimation.

[0050] A UE configured with a QCL type D RS can determine a UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the QCL type D RS.

[0051] The RS of QCL type X in the TCI state may also refer to an RS that is in a QCL type X relationship with a certain channel / signal (DMRS), and the RS may also be referred to as a QCL source of QCL type X in the TCI state.

[0052] <TCI status for PDCCH>

[0053] Information related to the PDCCH (or the DMRS antenna port associated with the PDCCH) and the QCL of a specific RS may also be referred to as the TCI state for the PDCCH, etc.

[0054] The UE may also determine the TCI state for a UE-specific PDCCH (or CORESET) based on higher layer signaling. For example, one or more (K) TCI states may be configured for each CORESET for the UE via RRC signaling.

[0055] The UE may activate one of multiple TCI states configured via RRC signaling for each CORESET via a MAC CE. This MAC CE may also be referred to as a TCI State Indication for UE-specific PDCCH MAC CE. The UE may also monitor the CORESET based on the activated TCI state corresponding to the CORESET.

[0056] <TCI status for PDSCH>

[0057] Information related to the PDSCH (or the DMRS antenna port associated with the PDSCH) and the QCL of a specific DL-RS may also be referred to as the TCI state for the PDSCH, etc.

[0058] The UE may also be notified (configured) of M (M ≥ 1) TCI states for PDSCH (QCL information for M PDSCHs) through higher layer signaling. Furthermore, the number M of TCI states configured for the UE may be limited by at least one of the UE capability and the QCL type.

[0059] The DCI used in PDSCH scheduling may also include a specific field indicating the TCI state for the PDSCH (for example, it may also be called a TCI field, a TCI state field, etc.). This DCI may also be used in scheduling the PDSCH of a cell, for example, it may also be called DL DCI, DL allocation, DCI format 1_0, DCI format 1_1, etc.

[0060] Whether the TCI field is included in the DCI can also be controlled by information notified to the UE from the base station. This information can also be information indicating whether the TCI field is present or absent in the DCI (for example, TCI presence information, TCI presence information in DCI, or the higher-layer parameter TCI-PresentInDCI). This information can also be set to the UE through higher-layer signaling, for example.

[0061] When more than eight TCI states are configured for a UE, a MAC CE may be used to activate (or specify) fewer than eight TCI states. This MAC CE may also be referred to as a TCI States Activation / Deactivation for UE-specific PDSCH MAC CE. The value of the TCI field within the DCI may also indicate one of the TCI states activated by the MAC CE.

[0062] When the UE sets the TCI existence information to "valid (enabled)" for the CORESET that schedules the PDSCH (the CORESET used in the PDCCH transmission that schedules the PDSCH), the UE can also assume that the TCI field exists in the DCI format 1_1 of the PDCCH sent on the CORESET.

[0063] When TCI existence information is not set for the CORESET that schedules the PDSCH, or when the PDSCH is scheduled using DCI format 1_0, when the time offset between the reception of the DL DCI (DCI that schedules the PDSCH) and the reception of the PDSCH corresponding to the DCI is greater than a threshold, in order to determine the QCL of the PDSCH antenna port, the UE may also assume that the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption applied to the CORESET used in the PDCCH transmission that schedules the PDSCH.

[0064] When TCI presence information is set to "enabled", when the TCI field in the DCI within the component carrier (CC) of the scheduled (PDSCH) indicates the activated TCI state within the scheduled CC or DL ​​BWP and the PDSCH is scheduled using DCI format 1_1, the UE may also use the TCI according to the value of the TCI field in the detected PDCCH with DCI to determine the QCL of the PDSCH antenna port. When the time offset between the reception of the DL DCI (scheduling the PDSCH) and the PDSCH corresponding to the DCI (the PDSCH scheduled by the DCI) is greater than a threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell and the RS in the TCI state associated with the QCL type parameter provided by the indicated TCI state are QCL.

[0065] In RRC connected mode, when the TCI information (higher layer parameter TCI-PresentInDCI) in the DCI is set to "valid (enabled)" or when the TCI information in the DCI is not set, if the time offset between the reception of the DL DCI (DCI that schedules the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is less than a threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell and the RS are QCL, which is the RS associated with the QCL parameters used in the QCL indication of the PDCCH for the CORESET with the smallest (lowest) CORESET-ID in the latest time slot monitored by the UE for one or more CORESETs within the active BWP of the serving cell and associated with the monitored search space. This RS may also be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

[0066] The time offset between the reception of DL DCI and the reception of the PDSCH corresponding to the DCI may also be referred to as a scheduling offset.

[0067] In addition, the above-mentioned threshold can also be referred to as the time length for QCL (time duration), "timeDurationForQCL", "threshold", "threshold for offset between a DCI indicating a TCIstate and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0068] The QCL time length may also be based on UE capabilities, for example, the delay required for PDCCH decoding and beam switching. The QCL time length may also be the minimum time required by the UE for PDCCH reception and application of spatial QCL information received in the DCI for PDSCH processing. The QCL time length may be expressed as the number of symbols per subcarrier spacing or as time (e.g., μs). Information about the QCL time length may be reported from the UE to the base station as UE capability information or may be set to the UE from the base station using higher layer signaling.

[0069] For example, the UE may also assume that the DMRS port of the PDSCH is QCL with the DL-RS, which is a DL-RS based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID. The latest time slot may also be the time slot for receiving the DCI scheduling the PDSCH.

[0070] Alternatively, the CORESET-ID may be an ID (an ID for identifying the CORESET, controlResourceSetId) set by the RRC information element "ControlResourceSet".

[0071] When CORESET is not configured for a CC, the default TCI state may be the activated TCI state that is applicable to the PDSCH within the activated DL BWP of the CC and has the lowest ID.

[0072] (HST)

[0073] In NR, it is assumed that a beam transmitted from a transmission point (e.g., RRH) is used to communicate with a terminal (hereinafter also referred to as UE) included in a high-speed train (HST (high-speed train)). Figure 1A 、 Figure 1B ).

[0074] Figure 1A The figure shows a case where a beam in one direction is transmitted from the RRH to communicate with a mobile object. Figure 1A , shows a situation where RRHs are installed along the moving path (or moving direction, traveling direction, or driving path) of a moving object, and each RRH forms a beam toward the moving direction of the moving object. RRHs that form a beam in one direction are also called uni-directional RRHs.

[0075] Here, the case where the beam is formed in the direction of travel of the moving object is shown, but the present invention is not limited thereto. The beam may be formed in the direction opposite to the direction of travel, or in all directions regardless of the direction of travel of the moving object.

[0076] Figure 1B The example shows a case where multiple (for example, two or more) beams are transmitted from the RRH to communicate with the mobile object. For example, it is assumed that beams are formed for both the moving direction of the mobile object and the direction opposite to the moving direction.

[0077] exist Figure 1B , illustrates a scenario where RRHs are installed along the moving path of a moving object, with each RRH forming beams in both the moving direction and the opposite direction of the moving object. RRHs that form beams in multiple directions (e.g., two directions) are also referred to as bi-directional RRHs.

[0078] In the future, it is expected that multiple RRHs (without the assistance of macro cells) arranged along a moving path will be used to support communications in a moving object moving at a speed of 500 km / h or more.

[0079] For example, let's consider the distance between two TRPs (or RRHs / antennas) and the time required between two beams. As an example, consider a scenario where the mobile speed is 550 km / h (= 139 m / s), the distance between two TRPs is 200 m or 300 m, and 64 beams are formed per TRP / RACH / antenna in each TRP.

[0080] When the distance between TRPs is 200m, the time required between two TRPs is 1.44s, and the time required between two beams is 22.5ms (refer to Figure 2 ). In addition, when the distance between TRPs is 300m, the time required between two TRPs is 2.16s, and the time required between two beams is 33.75ms.

[0081] exist Figure 2 In the time scaling shown, the switching / changing of the TCI state of the PDCCH can be appropriately performed by changing the TCI state (TCI state change) based on the MAC CE. In addition, the switching / changing of the TCI state of the PDSCH can be appropriately performed by changing the TCI state (TCI state change) based on the DCI.

[0082] Therefore, the switching of beams corresponding to PDCCH / CORESET can be controlled using higher layer signaling (e.g., RRC) and TCI state indication / update based on MAC CE.

[0083] <TCI status notification for PDCCH>

[0084] The network may also use MAC CE to notify the UE of the TCI status corresponding to the CORESET (or PDCCH). The MAC CE may also be a MAC CE for UE-specific PDCCH (e.g., UE specific PDCCH MAC CE) (see Figure 3 ).

[0085] Figure 3 This figure shows an example of a MAC CE used to notify the TCI state for PDCCH reception of a CORESET for a certain serving cell (or CC list). The UE can also determine the TCI state corresponding to the CORESET configured in a certain serving cell based on the MAC notified from the network.

[0086] However, in order to improve the performance of HST, it is considered to send PDCCH (or DCI) to the UE simultaneously by multiple TRPs / RRHs, or to set CORESET simultaneously. Each TRP / RRH can also use different QCL / beams.

[0087] The UE can also determine the TCI status of the PDCCH sent from each TRP (or the CORESET set in each TRP) based on information (e.g., MAC CE) notified from multiple (e.g., two) TRPs.

[0088] When a mobile body (or a UE included in the mobile body) communicates with a TRP / RRH configured on a mobile path, a DL signal (e.g., PDCCH) can be received by using a beam formed by each TRP / RRH (see Figure 4 ). Figure 4 This is a diagram showing an example of wireless communication between RRH#1 to RRH#3 arranged along a moving path and a moving object.

[0089] As a method of transmitting PDCCH from multiple TRP / RRHs simultaneously, the following cases 1 and 2 are considered (refer to Figure 5A 、 Figure 5B ).

[0090] <Scenario 1>

[0091] Case 1 is a structure supported in Rel.16 for transmitting multiple PDSCHs (NCJT TX) based on multiple DCIs. For example, PDCCH (or DCI) can be transmitted from different TRP / RRHs (for example, RRH#1 and RRH#2) using different CORESETs (see Figure 5A ). Different CORESETs can also be associated with different CORESET pool indices (e.g., CORESETPoolIndex). That is, the PDCCHs (or configured CORESETs) sent from each TRP / RRH are controlled differently.

[0092] <Scenario 2>

[0093] In case 2, the same DCI / PDCCH may be transmitted from multiple TRPs / RRHs (or the same CORESET may be configured). For example, PDCCH (or DCI) may be transmitted from different TRPs / RRHs (e.g., RRH#1 and RRH#2) using the same CORESET (see Figure 5B ). This improves reliability. In addition, Case 2 is a structure that is not yet supported in Rel.16.

[0094] In HST, from the perspective of improving communication reliability, it is also considered to apply Case 2. However, in such a case, how to control PDCCH (DCI) / CORESET transmission based on Case 2 or how to control the QCL concept becomes a problem.

[0095] Therefore, the inventors of the present invention studied the PDCCH (or DCI) transmitted from multiple TRP / RRHs and came up with the present embodiment. Specifically, the inventors studied the situation where the same DCI (for example, at least one DCI having the same format and notification content) is notified to the UE from multiple TRP / RRHs and came up with the present embodiment.

[0096] The following describes the embodiments of the present disclosure in detail with reference to the accompanying drawings. The structures described in each embodiment can be applied individually or in combination. Furthermore, the following description uses a mobile object as an example, but the present embodiment is not limited to the mobile object and can also be applied to situations where no mobile object is used.

[0097] TCI state, TCI state or QCL assumption, TCI state period (duration), QCL assumption, QCL period (duration), QCL parameter, spatial domain reception filter, UE spatial domain reception filter, spatial domain filter, UE reception beam, DL reception beam, DL precoding, DL precoder, DL-RS, QCL parameter followed by DMRS port, RS of QCL type D assumed by TCI state or QCL, RS of QCL type A assumed by TCI state or QCL can also be replaced with each other. RS of QCL type D, DL-RS associated with QCL type D, DL-RS with QCL type D, source of DL-RS, SSB, CSI-RS can also be replaced with each other.

[0098] In the present disclosure, the TCI state may also be information related to the receive beam (spatial domain receive filter) indicated (set) for the UE (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.). The QCL assumption may also be information related to the receive beam (spatial domain receive filter) assumed by the UE based on the transmission or reception of the associated signal (e.g., PRACH) (e.g., DL-RS, QCL type, cell to which the DL-RS is transmitted, etc.).

[0099] In this disclosure, a mobile object is any object that moves at a speed exceeding a certain speed, and may include, for example, a train, car, motorcycle, or ship. Furthermore, communication between a UE included in a mobile object and a transmission point (e.g., an RRH) can occur directly between the UE and the transmission point, or between the UE and the transmission point via the mobile object (e.g., an antenna installed on the mobile object). Furthermore, in this disclosure, a UE included in a mobile object (HST) may be simply referred to as a UE.

[0100] In the present disclosure, the term "X" (eg, TCI state, control resource set) may be replaced by "X" being set differently (or independently). The TCI state of the PDCCH may be replaced by the TCI state of the PDCCH DMRS.

[0101] In addition, in the present disclosure, “A / B” may be replaced by at least one of A and B, and “A / B / C” may be replaced by at least one of A, B, and C.

[0102] (First Method)

[0103] In the first method, the case of supporting the setting / activation / notification of multiple TCI states for a control resource set is described. In the following description, two TCI states are listed as an example of multiple TCI states, but the same application can also be applied to more than three TCI states.

[0104] The UE may also receive a TCI state notification (e.g., a TCI State Indication) for activating one or more (e.g., two) TCI states for a control resource set. The TCI state notification may also be notified via a MAC CE. The MAC CE may also be a UE-specific PDCCH MAC CE (UE-specific PDCCH MAC CE).

[0105] As the MAC CE used in the TCI status notification, it is also possible to use the MAC CE of the existing system (for example, Rel.15) (for example, refer to the above Figure 3 ) A new MAC CE is defined differently. The new MAC CE may also have a new LCID (Logical Channel ID).

[0106] New MAC CE Structure #1

[0107] In the new MAC CE, multiple TCI states (for example, two TCI state indexes) can also be set / activated / notified (refer to Figure 6A ). Figure 6A This figure shows an example of a new MAC CE. Here, the new MAC CE includes a bit field for specifying a serving cell (e.g., a serving cell ID), a bit field for specifying a control resource set (e.g., a CORESETID), and a bit field for specifying multiple TCI states (e.g., a TCI state ID).

[0108] Here, a case is shown where two bit fields (for example, TCI State ID#1, TCI State ID#2) are included as bit fields for specifying multiple TCI states, but the number of bit fields is not limited to this.

[0109] The UE may also detect a new MAC CE for activating two TCI states for a control resource set. In addition, the UE may also detect an existing MAC CE for activating one TCI state for a control resource set in addition to the new MAC CE.

[0110] When a new MAC CE is detected or received, the UE may also assume that at least one of the multiple TCI states is applied to the control resource set ID specified by the new MAC CE, and control reception of the PDCCH transmitted in the control resource set. For example, when PDCCHs (or DCI) are transmitted from multiple TRPs / RRHs using control resource sets with the same index, the UE may also assume that different TCI states are applied to the control resource sets corresponding to each TRP.

[0111] Therefore, even when the same PDCCH (or DCI) is sent from multiple TRPs using the same control resource set, the TCI state applied to the control resource set can be set differently for each TRP.

[0112] New MAC CE Structure #2

[0113] exist Figure 6A The MAC CE shown shows a case where multiple TCI states are always notified, but the present invention is not limited to this. A structure in which one or more (for example, two) TCI states can be notified in a new MAC CE may also be used.

[0114] For example, a bit field indicating whether at least one of the two TCI status index bit fields is valid or invalid may be set in the MAC CE (see Figure 6B ). Here, the following situation is shown, that is, the bit field used in the notification of the first TCI state (for example, TCI state #1) and the second TCI state (for example, TCI state #2) is set respectively, and the notification bit field is set to notify whether the bit field of the second TCI state is valid.

[0115] For example, if the Notification Bit field is "1," two TCI states (TCI State #1 and TCI State #2) may be activated via a new MAC CE. On the other hand, if the Notification Bit field is "0," a single TCI state (TCI State #1) may be activated via a new MAC CE. In this case, the UE may ignore the second TCI state bit field.

[0116] As a result, the new MAC CE can be used to set / activate / notify one or more TCI states, so the UE can also be controlled to detect the new MAC CE instead of the existing MAC CE.

[0117] In this way, multiple TCI states can be configured for a single control resource set, making it possible to configure the same control resource set with different TCI states in different TRPs / RRHs to transmit PDCCH (or DCI). The UE can simply receive and process PDCCH (or DCI) as if it were transmitted from multiple TRPs using the same control resource set. This simplifies the UE's reception process.

[0118] Furthermore, the format / at least a portion of the notification content of the DCI sent from different TRPs / RRHs may be the same. The DCI format may be DCI format 1_1 or DCI format 0_1. At least a portion of the notification content may be allocation (or scheduling) information for a downlink shared channel or an uplink shared channel.

[0119] (Second Method)

[0120] In the second embodiment, a case where notification of the TCI state for a control resource set (or PDCCH) is controlled based on higher layer parameters (eg, RRC) and MAC CE will be described.

[0121] The network may also configure or notify the UE of one or more TCI state candidates for the control resource set using higher-layer parameters (or higher-layer signaling). Furthermore, the network may also notify or designate a specific activated TCI state candidate from among the TCI state candidates configured using higher-layer parameters to the UE using a MAC CE.

[0122] The candidate higher-layer parameters for setting / notifying one or more TCI states may be new higher-layer parameters different from those used in existing systems (e.g., Rel. 15 or Rel. 16), or may utilize higher-layer parameters from existing systems. The UE may also determine the active TCI state based on at least one of the following notification methods #1 or #2.

[0123] <Notification method #1>

[0124] Notification method #1 can also be applied when new higher-layer parameters are configured (for example, higher-layer parameters for the PDCCH transmission mode in Rel. 17). When one, two, or X (X > 2) TCI states are configured / notified for a control resource set using the new higher-layer parameters, the active TCI state can be determined using different methods based on the number of configured TCI states.

[0125] When X (X > 2) TCI states are configured via higher-layer parameters, the UE may also receive a TCI state notification for activating (or notifying activation of) one or two TCI states for control resources. This TCI state notification may also be notified via a MAC CE (e.g., a MAC CE for a UE-specific PDCCH). This MAC CE may also be applied to at least one of the new MAC CE structure #1 and the new MAC CE structure #2 shown in the first embodiment.

[0126] When two TCI states are set by higher-layer parameters, at least one of the following options 1-1 and 1-2 may be applied.

[0127] [Option 1-1]

[0128] The UE may also be configured to always receive a TCI state notification for activating (or notifying activation of) one or both TCI states for control resources. This TCI state notification may also be notified via a MAC CE (e.g., a MAC CE for a UE-specific PDCCH). This MAC CE may also be applied to at least one of the new MAC CE structure #1 and the new MAC CE structure #2 shown in the first embodiment.

[0129] [Option 1-2]

[0130] The UE may also assume two TCI states for a control resource set when new higher-layer parameters are configured and a MAC CE notifying the TCI state for the control resource set is not received. This MAC CE may also be a MAC CE from the existing system and a new MAC CE. In other words, the UE may also assume that two TCI states configured / notified by higher-layer parameters are applied to the control resource set when a MAC CE notifying the TCI state is not received.

[0131] It is also conceivable that, upon receiving a MAC CE specifying activation of one or two TCI states for a control resource set, the UE may apply the TCI state notified by the MAC CE to the control resource set.

[0132] In addition, in option 2, when new higher-layer parameters are set and two (or less) TCI states are set / notified through the higher-layer parameters, the UE may also assume that it has not received the MAC CE notifying the TCI state for the control resource set.

[0133] In the case where a TCI state is set using a higher-layer parameter, the UE may also assume that the TCI state set / notified using the higher-layer parameter is applied in the control resource set.

[0134] When no new higher layer parameters are configured, the UE may also apply operations specified in the existing system.

[0135] <Notification method #2>

[0136] Notification method #1 can also be applied without configuring or defining new higher-layer parameters (e.g., configuring higher-layer parameters for the PDCCH transmission mode in Rel. 17). When one, two, or X (X > 2) TCI states are configured or notified for a control resource set via higher-layer parameters, the active TCI state can be determined using different methods based on the number of configured TCI states.

[0137] When X (X > 2) TCI states are configured via higher-layer parameters, the UE may also receive a TCI state notification for activating (or notifying activation of) one or two TCI states for control resources. This TCI state notification may also be notified via a MAC CE (e.g., a MAC CE for a UE-specific PDCCH). This MAC CE may also be applied to at least one of the new MAC CE structure #1 and the new MAC CE structure #2 shown in the first embodiment.

[0138] When two TCI states are set by higher-layer parameters, at least one of the following options 2-1 and 2-2 may be applied.

[0139] [Option 2-1]

[0140] The UE may also be configured to always receive a TCI state notification for activating (or notifying activation of) one or both TCI states for control resources. This TCI state notification may also be notified via a MAC CE (e.g., a MAC CE for a UE-specific PDCCH). This MAC CE may also be applied to at least one of the new MAC CE structure #1 and the new MAC CE structure #2 shown in the first embodiment.

[0141] [Option 2-2]

[0142] When at least one control resource set (e.g., another control resource set) having X (X>2) TCI states according to higher-layer parameters is activated with two TCI states via a MAC CE, and no MAC CE notifying the TCI states for the control resource set is received, the UE may assume two TCI states for the control resource set. This MAC CE may also be a MAC CE of the existing system or a new MAC CE. In other words, when two TCI states are activated via a MAC CE when more than two TCI states are set, the UE may also assume that the two TCI states set / notified by the higher-layer parameters are applied to the control resource set when two TCI states are set according to higher-layer parameters and no MAC CE notifying the TCI states is received.

[0143] It is also conceivable that, upon receiving a MAC CE specifying activation of one or two TCI states for a control resource set, the UE may apply the TCI state notified by the MAC CE to the control resource set.

[0144] In addition, in option 2, in the case where two TCI states are activated through MAC CE when more than two TCI states are set, or in the case where two (or less) TCI states are set / notified through higher-layer parameters, the UE can also be assumed to have not received the MAC CE notifying the TCI state for the control resource set.

[0145] When a TCI state is set by a higher-layer parameter, the UE may also assume that the TCI state set / notified by the higher-layer parameter is applied in the control resource set.

[0146] (Third Method)

[0147] In the third method, the PDCCH resources or the configured control resource set for the case where the UE is sent DCI with the same format / notification content from multiple TRPs are described.

[0148] In the case where DCI is transmitted to a UE from multiple TRPs, at least one of the following options 3-1 to 3-4 may be applied to the PDCCH or control resource set used in the transmission of the DCI. The DCI transmitted from multiple TRPs may also be the same DCI. The so-called same DCI may also be DCI with the same format / notification content. The notification content may also be at least a portion of the notification content (for example, scheduling information for a shared channel).

[0149] <Option 3-1>

[0150] When multiple TCI states are configured / activated / notified for a control resource set, the UE may detect one DCI (e.g., DCI format) in a control resource set with two TCI states in the same symbol. The DCI format may be any of DCI format 1_1 for scheduling PUSCH, DCI format 0_1 ​​for scheduling PUSCH, or a specific DCI format X.

[0151] DCIs transmitted from multiple TRPs (e.g., two TRPs) may be transmitted using the same resource (e.g., a resource with the same time and frequency) (see Figure 7A ).exist Figure 7A , shows a case where DCI is transmitted using resources with the same time and frequency.

[0152] Each TRP may also configure a control resource set with the same index, allocate a PDCCH (or DCI) to the same resources within the configured control resource set, and transmit the result to the UE. In this case, the control resource set configured for each TRP (or the PDCCH (or DCI) transmitted from each TRP) may be configured such that only the TCI state (or QCL / beam) is configured differently (e.g., the TCI state is different). The format / notification content of the DCI transmitted from each TRP may also be the same.

[0153] Thus, in Option 3-1, multiple TRPs utilize a control resource set with multiple TCI states configured as the same resource to transmit DCI with the same format and notification content. This simplifies the detection operation in the UE. In addition, by utilizing the same resources, resource utilization efficiency can be improved.

[0154] <Option 3-2>

[0155] When multiple TCI states are configured / activated / notified for a control resource set, the UE may detect up to two DCIs (e.g., DCI formats) in a control resource set with two TCI states in the same symbol. The DCI format may be any of DCI format 1_1 for scheduling PUSCH, DCI format 0_1 ​​for scheduling PUSCH, or a specific DCI format X.

[0156] DCIs transmitted from multiple TRPs (e.g., two TRPs) may be transmitted using different resources (e.g., resources with different frequencies) (see Figure 7B ).exist Figure 7B , shows a case where DCI is transmitted using resources with different frequencies (same time).

[0157] Each TRP may also be configured with a control resource set with the same index, and PDCCH (or DCI) may be allocated to different resources within the configured control resource set and sent to the UE. In this case, the control resource set configured for each TRP (or the PDCCH (or DCI) sent from each TRP) may also be configured with different TCI states (or QCL / beams) (e.g., different TCI states). The format / notification content of the DCI sent from each TRP may also be the same.

[0158] Thus, in Option 3-2, DCI with the same format / notification content is transmitted from multiple TRPs using a control resource set with multiple TCI states configured for different resources (e.g., different frequency resources). This can improve the received power of the PDCCH transmitted via different resources.

[0159] <Option 3-3>

[0160] When multiple TCI states are configured / activated / notified for one control resource set, the UE may also simultaneously detect two DCIs (e.g., DCI formats) from different control resource sets with different TCI states. The format / notification content of the DCI sent from each TRP may also be the same.

[0161] That is, in option 3-3, DCI with the same format / notification content can also be sent from multiple TRPs using different control resource sets that are respectively set to different resources (for example, different frequency resources) and have different TCI states.

[0162] Each control resource set may correspond to only one TCI state. The UE may also simultaneously detect DCI from two control resource sets with different TCI states. Furthermore, the UE may also be configured to receive the same DCI from different control resource sets with different TCI states when supporting a new transmission mode (e.g., supporting the configuration / activation / notification of multiple TCI states for a single control resource set).

[0163] In option 3-3, the framework of the control resource set in the existing system (for example, Rel.15) can be applied to send the same DCI using different control resource sets respectively set for each TRP.

[0164] <Options 3-4>

[0165] When multiple TCI states are configured / activated / notified for a control resource set (CRES), the UE may also simultaneously detect two DCIs (e.g., DCI formats) from multiple CRES selected by different CRES pool indices. The formats / notification contents of the DCIs sent from each TRP may also be the same.

[0166] That is, in option 3-4, DCI with the same format / notification content can also be sent from multiple TRPs using different control resource sets that are respectively set to different resources (for example, different frequency resources) and have different control resource set pool indices.

[0167] Each control resource set may correspond to only one TCI state. The UE may also simultaneously detect DCI from different control resource set pools. Furthermore, the UE may also assume that, when supporting a new transmission mode (e.g., supporting the setting / activation / notification of multiple TCI states for a control resource set), the same DCI is transmitted from control resource sets selected by different control resource set pool indices.

[0168] In option 3-4, the framework of the control resource set pool index in the existing system (eg, Rel. 16) can be applied to transmit the same DCI using control resource sets selected from different control resource set pool indexes.

[0169] <Change>

[0170] Resource blocks (eg, PRBs) allocated to multiple PDCCHs (eg, two PDCCHs) transmitted from multiple TRPs (eg, two TRPs) may have an overlapping structure or a non-overlapping structure.

[0171] When the PRBs of two PDCCHs overlap (for example, option 3-1), the two PDCCHs become the same resources (time and frequency resources), so the number of decoding (for example, blind detection) performed by the UE can also be applied the same number of times as one TRP.

[0172] When the PRBs of two PDCCHs do not overlap (for example, options 3-2 to 3-4), the two PDCCHs become different resources, so the number of decoding (for example, blind detection) performed by the UE can also be applied a number different from one TRP (for example, more than one TRP).

[0173] For example, the UE may also independently set the search space for each TRP and perform blind detection for each TRP. In this case, the increase in blind detection may be suppressed by limiting at least one of the search space, monitoring resources, and aggregation level for each TRP. For example, the time / frequency resources of the search space measured by the first TRP may be added with a specific offset to determine the time / frequency resources of the search space measured by the second TRP. As a result, blind detection is not performed independently in the control resource set of each TRP, thereby reducing the number of blind detections.

[0174] The UE may also assume that the PRBs of the PDCCHs sent from multiple TRPs do not overlap, and control the UE to detect the DCI sent through each PDCCH. Assuming that the PRBs of the PDCCHs sent from multiple TRPs overlap, the UE may also control the UE to detect only the DCI sent through any one PDCCH (for example, DCI associated with a specific TRP). The specific TRP may also be the TRP with the lowest index (lowest TRP ID) or the TRP with the highest index (highest TRPID (highest TRP ID)).

[0175] (UE Capabilities)

[0176] It is also possible to introduce a UE capability that indicates whether a control resource set supports multiple TCI states being activated / notified at the same time.

[0177] For example, the UE may simultaneously assume multiple (e.g., two) TCI states and report information related to whether it can support DCI reception as UE capability information. Alternatively, the UE may also report information related to whether it can support a DCI format that can be assumed to be received simultaneously in multiple (e.g., two) TCI states as UE capability information.

[0178] Alternatively, the UE may also report information related to the number of control resource sets that are activated / notified in multiple (e.g., two) TCI states at the same time as UE capability information.

[0179] (QCL Migration Information)

[0180] In the first to third aspects, the UE included in the HST may determine the TCI state / QCL assumption / QCL period used in transmission and reception with the NW based on information related to beam transition.

[0181] Information related to beam migration can also be replaced by information related to SSB migration, information related to CSI-RS migration, and information related to SSB / CSI-RS migration. In addition, in the present disclosure, "migration" can also be replaced with "change", "update", "switch", "enable", "disable", "activate", "deactivate", "activate / deactivate", etc.

[0182] The UE may also control the reception of DL transmissions sent from a transmission point based on information related to beam migration. Beam migration may also be interchangeable with TCI state migration or QCL migration. Information related to beam migration may be notified to the UE from the network (e.g., base station, transmission point) using at least one of RRC signaling and MAC CE, or may be predefined in the specification.

[0183] Information related to beam migration may include at least one of information related to TCI state migration, a period corresponding to each beam (also referred to as a beam period or beam time), and a period corresponding to the RRH (also referred to as an RRH period or RRH time). Furthermore, the period or time may be specified in units of at least one of a symbol, a slot, a subslot, a subframe, and a frame, or in units of milliseconds or μs. The period or time may also be replaced with a distance or an angle.

[0184] Information related to TCI state transitions (e.g., TCI#n → TCI#n+1) may also be TCI state transitions, ordering, or indexes. The duration associated with a beam may also be the duration or dwell time of the beam. The duration associated with a transmission point (RRH) may also be the duration or dwell time of the RRH.

[0185] The period corresponding to the RRH may also be equivalent to the sum of the periods corresponding to each beam in the RRH. For example, the UE may obtain the period corresponding to the RRH based on the period corresponding to each beam. In this case, the period corresponding to the RRH does not need to be notified to the UE or predefined.

[0186] The TCI state and each beam period can also be associated with each other. In addition, one or more (for example, two) TCI states can be associated with each beam period. In addition, the one or more TCI states can also correspond to a control resource set (or PDCCH / PDCCH DMRS).

[0187] (Wireless Communication System)

[0188] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present disclosure or a combination thereof.

[0189] Figure 8 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), or the like.

[0190] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0191] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0192] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0193] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are deployed within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The configuration and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0194] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0195] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (below 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0196] Furthermore, the user terminal 20 may perform communication using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0197] Multiple base stations (e.g., RRHs) 10 may be connected via a wired connection (e.g., an optical fiber based on a Common Public Radio Interface (CPRI) or an X2 interface) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11, which is equivalent to the upper station, may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12, which is equivalent to a relay station (relay), may also be referred to as an IAB node.

[0198] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0199] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0200] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0201] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0202] As downlink channels, the wireless communication system 1 may use a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20), a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc.

[0203] In addition, as uplink channels, the wireless communication system 1 can also use an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc.

[0204] User data, higher-layer control information, and system information blocks (SIBs) are transmitted via the PDSCH. User data, higher-layer control information, and the like can also be transmitted via the PUSCH. Furthermore, the Master Information Block (MIB) can also be transmitted via the PBCH.

[0205] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0206] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be replaced by DL data, and the PUSCH may also be replaced by UL data.

[0207] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0208] A search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0209] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR) can also be transmitted via the PUCCH. The random access preamble used to establish a connection with a cell can also be transmitted via the PRACH.

[0210] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "physical" at the beginning.

[0211] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. can also be transmitted. As DL-RS, in the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. can also be transmitted.

[0212] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0213] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0214] (Base Station)

[0215] Figure 9This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transmitting / receiving unit 120, the transmitting / receiving antenna 130, and the transmission path interface 140 may be provided.

[0216] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0217] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0218] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0219] The transceiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0220] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0221] The transmitting and receiving antenna 130 can be formed of an antenna described based on common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0222] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0223] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmit beam and a receive beam.

[0224] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0225] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (DFT) processing (as needed), inverse fast Fourier transform (IFFT) processing), precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0226] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0227] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0228] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0229] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0230] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0231] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0232] The transmitting and receiving unit 120 may also transmit a MAC CE capable of specifying multiple transmission configuration indication (TCI) states for one control resource set.

[0233] The transmitting and receiving unit 120 may also transmit multiple downlink control information from multiple transmission points using control resource sets respectively.

[0234] The control unit 110 may also control the transmission of downlink control information by using a control resource set to which at least one of the multiple TCI states notified through the MAC CE is applied.

[0235] The control unit 110 may also control the allocation of the downlink shared channel or the uplink shared channel through a plurality of downlink control information.

[0236] (User Terminal)

[0237] Figure 10 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0238] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0239] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which this disclosure relates.

[0240] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0241] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on common knowledge in the technical fields involved in this disclosure.

[0242] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit or may be composed of a transmitting unit and a receiving unit. The transmitting unit may also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0243] The transmitting and receiving antenna 230 can be formed of an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0244] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0245] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0246] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0247] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0248] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is valid (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0249] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0250] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filter processing, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 230 .

[0251] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply receiving processing such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0252] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0253] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0254] The transmitting and receiving unit 220 may also receive a MAC CE capable of specifying multiple transmission configuration indication (TCI) states for one control resource set.

[0255] The transmitting and receiving unit 220 may also receive a plurality of downlink control information transmitted from a plurality of transmission points using control resource sets.

[0256] The control unit 210 may also control the reception of downlink control information transmitted from multiple transmission points using the same control resource set (eg, control resource set with the same index) based on the MAC CE.

[0257] The MAC CE may also include a first bit field indicating the index of a control resource set and multiple second bit fields each indicating a plurality of TCI states corresponding to the control resource set. The MAC CE may also include a third bit field that specifies whether at least one of the plurality of second bit fields is valid or invalid. When multiple TCI states are set via higher layer signaling, the control unit 210 may also control activation of one or two TCI states specified by the MAC CE.

[0258] Alternatively, the control unit 210 may determine allocation of the downlink shared channel or uplink shared channel based on multiple downlink control information. The multiple downlink control information transmitted from multiple transmission points may have at least one of the same format and the same notified scheduling content.

[0259] Alternatively, for control resource sets configured for multiple transmission points, the same index may be assigned to multiple TCI states, and downlink control information transmitted from the multiple transmission points may be transmitted using downlink control channels allocated to the same resources. Alternatively, for control resource sets configured for multiple transmission points, the same index may be assigned to multiple TCI states, and downlink control information transmitted from the multiple transmission points may be transmitted using downlink control channels allocated to different resources. Alternatively, for control resource sets configured for multiple transmission points, the same index may be assigned to multiple transmission points, and downlink control information transmitted from the multiple transmission points may be transmitted using downlink control channels allocated to different resources.

[0260] (Hardware Structure)

[0261] In addition, the block diagrams used in the description of the above embodiments show 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 by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0262] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0263] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 11 This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0264] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0265] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0266] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) 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 storage 1003.

[0267] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the control unit 110 (210) and the transmitting and receiving unit 120 (220) described above may also be implemented by the processor 1001.

[0268] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002 and performs various processes based on them. As a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0269] The memory 1002 may also be a computer-readable recording medium, for example, comprised of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store executable programs (program code), software modules, etc., for implementing the wireless communication method according to an embodiment of the present disclosure.

[0270] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0271] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220), transmitting and receiving antenna 130 (230), and the like may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be implemented by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0272] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0273] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0274] Furthermore, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and may use such hardware to implement part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0275] (Variation)

[0276] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0277] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0278] Here, a parameter set may also refer to communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0279] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0280] A time slot may also contain multiple mini-slots. Each mini-slot may also consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

[0281] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0282] For example, a subframe can be called a TTI, multiple consecutive subframes can be called a TTI, and a slot or a mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can 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. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0283] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0284] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0285] In addition, when a time slot or a mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can also be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can also be controlled.

[0286] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP 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 also 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-slot, a subslot, a time slot, etc.

[0287] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be replaced by TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be replaced by TTI with a TTI length smaller than long TTI and greater than 1ms.

[0288] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0289] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0290] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0291] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0292] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a particular carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0293] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0294] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, the terms "cell," "carrier," and the like in this disclosure may be replaced with "BWP."

[0295] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0296] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0297] The names used for parameters, etc. in this disclosure are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0298] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0299] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0300] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or appended. Output information, signals, etc. may also be deleted. Input information, signals, etc. may also be sent to other devices.

[0301] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0302] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using, for example, a MAC Control Element (CE).

[0303] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0304] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0305] The term “software” or “firmware” shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, sub-programs, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, or the like.

[0306] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0307] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0308] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)" "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0309] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macro cell, small cell, femto cell, or pico cell.

[0310] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within that coverage area.

[0311] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (UE)”, and “terminal” can be used interchangeably.

[0312] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0313] 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. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a means of transportation (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, 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 also be an Internet of Things (IoT) device such as a sensor.

[0314] In addition, the base station in the present disclosure may also be replaced by 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 base station and a user terminal is replaced by communication between multiple user terminals (for example, which may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be configured such that the user terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0315] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0316] In the present disclosure, actions are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0317] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the methods described in this disclosure use an illustrative order to present elements of various steps, but are not limited to the specific order presented.

[0318] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (WiMAX (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (WiMAX (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A, combined with 5G, etc.).

[0319] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0320] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and a second element does not imply that only two elements may be used or that the first element must in some way take precedence over the second element.

[0321] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also include judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc. as performing a "determination."

[0322] In addition, "judgment (decision)" can also be a situation where receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0323] Furthermore, "judgment (decision)" can also refer to situations where resolving, selecting, choosing, establishing, comparing, etc. can be considered as "judgment (decision)". In other words, "judgment (decision)" can also refer to situations where certain actions can be considered as "judgment (decision)".

[0324] In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and so on.

[0325] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be replaced by "access."

[0326] In the present disclosure, when two elements are connected, it is possible to consider them being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0327] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted in the same way as "different."

[0328] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0329] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0330] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal comprising: a receiving unit, receiving a MAC control element (MAC CE) indicating multiple transmission setting indication states (TCI states) for a control resource set (CORESET); and The control unit controls, in the one CORESET, receiving a plurality of downlink control channels PDCCH that carry the same downlink control information DCI using the plurality of TCI states. The MAC CE has a logical channel ID, ie, an LCID, which is different from the LCID of the second MAC CE indicating a TCI state for a CORESET.

2. The terminal according to claim 1, The MAC CE includes a bit field specifying a serving cell, a bit field specifying the one CORESET, and a bit field specifying the multiple TCI states.

3. The terminal according to claim 1, The receiving unit receives the MAC CE when a higher layer parameter for setting a plurality of TCI states for the CORESET is set.

4. The terminal according to claim 1, further comprising: The sending unit sends capability information, where the capability information indicates support for a CORESET in which multiple TCI states are represented.

5. A wireless communication method, comprising: The step of receiving a MAC control element (MAC CE) indicating multiple transmission setting indication states (TCI states) for a control resource set CORESET; and performing a step of controlling, in the one CORESET, receiving a plurality of downlink control channels PDCCHs carrying the same downlink control information DCI using the plurality of TCI states, The MAC CE has a logical channel ID, ie, an LCID, which is different from the LCID of the second MAC CE indicating a TCI state for a CORESET.

6. A system comprising a terminal and a base station, The terminal comprises: a receiving unit, receiving a MAC control element (MAC CE) indicating multiple transmission setting indication states (TCI states) for a control resource set (CORESET); and The control unit controls, in the one CORESET, receiving a plurality of downlink control channels PDCCH that carry the same downlink control information DCI using the plurality of TCI states. The base station comprises: A sending unit sends the MAC CE, The MAC CE has a logical channel ID, ie, an LCID, which is different from the LCID of the second MAC CE indicating a TCI state for a CORESET.

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