Terminal, wireless communication method, and base station

Abstract

A terminal involved in one embodiment of the present disclosure comprises: a receiving unit that receives information related to the migration of multiple transmission setting indication states, i.e., multiple TCI states, which can be used in DL transmission sent from one or more transmission points configured in a mobile path; and a control unit that determines the period corresponding to each of the multiple TCI states based on multiple DL reference signals and at least one of the downlink control information.

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 the fifth generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 and later) 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 (such as NR), in order to achieve wireless communication in high-speed moving objects (such as trains, etc.), it is envisaged to use beams sent from transmission points (such as Remote Radio Head (RRH)) configured in the path of the moving object.

[0009] However, sufficient research has not been conducted on how to control wireless communications in a mobile object using beams transmitted from various transmission points.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately controlling wireless communication in a mobile object.

[0011] Means for solving problems

[0012] A terminal involved in one embodiment of the present invention is characterized in that it comprises: a receiving unit that receives information related to the migration of multiple transmission setting indication states, i.e., multiple TCI states, which can be used in DL transmission sent from one or more transmission points configured in a mobile path; and a control unit that determines the period corresponding to each of the multiple TCI states based on multiple DL reference signals and at least one of the downlink control information.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, wireless communication in a mobile object can be appropriately controlled. 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 (for example, RRH).

[0016] Figure 2A as well as Figure 2B This is a diagram showing an example of communication control according to the first embodiment.

[0017] Figure 3A as well as Figure 3B This is a diagram showing another example of communication control according to the first embodiment.

[0018] Figure 4A as well as Figure 4B This is a diagram showing another example of communication control according to the first embodiment.

[0019] Figure 5A as well as Figure 5B This is a diagram showing an example of a table indicating the distances between RRHs according to the first example.

[0020] Figure 6A as well as Figure 6B This is a diagram showing an example of the correspondence between the TCI state and the beam period involved in the first method.

[0021] Figure 7 This is a diagram showing another example of the correspondence between the TCI state and the beam period involved in the first method.

[0022] Figure 8Aas well as Figure 8B This is a diagram showing an example of communication control according to the second embodiment.

[0023] Figure 9 This is a diagram showing another example of communication control according to the second embodiment.

[0024] Figure 10 This is a diagram showing another example of communication control according to the second embodiment.

[0025] Figure 11A as well as Figure 11B This is a diagram showing another example of communication control according to the second embodiment.

[0026] Figure 12A as well as Figure 12B This is a diagram showing another example of communication control according to the second embodiment.

[0027] Figure 13A as well as Figure 13B This is a diagram showing an example of communication control according to the third embodiment.

[0028] Figure 14 This is a diagram showing an example of switching of beam periods (transition of TCI states) according to the third method.

[0029] Figure 15 This is a diagram showing another example of switching of beam periods (transition of TCI states) according to the third method.

[0030] Figure 16 This is a diagram showing another example of switching of beam periods (transition of TCI states) according to the third method.

[0031] Figure 17 This is a diagram showing an example of the switching timing of the beam period according to the third example.

[0032] Figure 18 This is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.

[0033] Figure 19 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0034] Figure 20 This is a diagram showing an example of the configuration of a user terminal according to one embodiment.

[0035] Figure 21 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

[0036] (HTS)

[0037] In NR, in order to communicate with a terminal (hereinafter also referred to as UE) included in a high-speed train (HTS), etc., it is assumed that a beam transmitted from a transmission point (e.g., RRH) is used. In existing systems (e.g., Rel. 15), communication with a mobile object is supported by transmitting a beam in one direction from the RRH (see Figure 1A ).

[0038] Figure 1A , shows a case where RRHs are set up along the moving path (or moving direction, traveling direction, or forward path) of a moving object, and beams are formed from each RRH in the moving direction of the moving object. RRHs that form a beam in one direction are also called uni-directional RRHs. Figure 1A In the example shown, the mobile object receives a negative Doppler shift (-f D ).

[0039] In addition, although the case where the beam is formed on the traveling direction side of the moving body is shown here, the present invention is not limited to this, and the beam may be formed on the side opposite to the traveling direction.

[0040] In Rel. 16 and later, it is also assumed that multiple (for example, two or more) beams are transmitted from the RRH. For example, it is assumed that beams are formed in both the moving direction and the direction opposite to the moving direction of the mobile object (see Figure 1B ).

[0041] Figure 1B , illustrates the arrangement of RRHs along the path of a moving object, with each RRH forming beams both in the moving object's direction and in the direction opposite to the moving object's direction of travel. RRHs that form beams in multiple directions (e.g., two directions) are also referred to as bidirectional RRHs.

[0042] Figure 1B In the example shown, the mobile object switches from receiving a negative Doppler shift signal to receiving a positive Doppler shift signal with a higher power at the middle of two RRHs (here, RRH #1 and RRH #2). In this case, the maximum Doppler shift change required to be corrected is -f D Change to +f D , which is twice as much as that of the unidirectional RRH case.

[0043] In the future, it is expected to support communications in a mobile body moving at a speed of 500 km / h or more using a plurality of RRHs arranged in a moving path (without the assistance of a macro cell).

[0044] On the other hand, when the mobile object moves at high speed, it is expected that it will be difficult to appropriately perform control such as beam steering and switching.

[0045] For example, beam control in existing systems (e.g., prior to Rel. 15) is performed through a process that includes L1-RSRP reporting, beam notification (TCI state, spatial relation setting, or activation), and receive beam determination. However, it is difficult to perform this series of processes (e.g., TCI state notification or QCL assumptions) in a short throughput period using existing system methods.

[0046] In addition, handover control is performed according to a procedure such as measurement reporting (L3-RSRP, L3-SINR reporting), handover command, random access channel transmission, and RRC connection completion, but it is difficult to perform this series of processes in a short period of time.

[0047] (TCI, spatial relationship, QCL)

[0048] In NR, research is underway on 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 coding) in the UE based on the transmission configuration indication state (TCI state), control signals, and at least one of channels (expressed as signal / channel).

[0049] The TCI status can also represent the status of the signal / channel applied to the downlink. The TCI status of the signal / channel applied to the uplink can also be expressed as a spatial relation.

[0050] The TCI state refers to 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 state may also be set for each channel or each signal pair of UEs.

[0051] QCL refers to an indicator that represents the statistical properties of a signal / channel. For example, when a signal / channel is in a QCL relationship with another signal / channel, it can also mean that at least one of the Doppler shift, Doppler spread, average delay, delay spread, or spatial parameter (e.g., spatial Rx parameter) can be assumed to be the same between these different signals / channels (at least one of these is QCL).

[0052] In addition, the spatial reception parameters may correspond to the UE's receive beam (e.g., receive analog beam), or the beam may 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).

[0053] QCL can also specify multiple types (QCL types). For example, it can be assumed that the same parameters (or parameter sets) can also set four different QCL types AD. The following is an illustration of the parameters (also called QCL parameters):

[0054] QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay, and delay spread,

[0055] QCL type B (QCL-B): Doppler shift and Doppler spread,

[0056] QCL Type C (QCL-C): Doppler shift and average delay,

[0057] QCL type D (QCL-D): spatial reception parameters.

[0058] The UE assumes that a specific Control Resource Set (CORESET), channel or reference signal has a specific QCL (eg, QCL type D) relationship with other CORESETs, channels or reference signals, which may also be referred to as a QCL assumption.

[0059] 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.

[0060] The TCI status may also be information related to the QCL of the target channel (in other words, the reference signal (RS) used for the channel) and other signals (such as other RS). The TCI status may also be set (indicated) through higher layer signaling, physical layer signaling, or a combination thereof.

[0061] In the present disclosure, the high-layer signaling may also be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0062] MAC signaling may also utilize, for example, MAC Control Element (MAC CE) and MAC Protocol Data Unit (PDU). Broadcast information may also include, for example, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), and Other System Information (OSI).

[0063] The physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)).

[0064] The channel for which the TCI state or spatial relationship is set (specified) may also be, for example, at least one of the downlink shared channel (Physical Downlink Shared Channel (PDSCH), the downlink control channel (Physical Downlink Control Channel (PDCCH), the uplink shared channel (Physical Uplink Shared Channel (PUSCH), and the uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0065] In addition, the RS that forms a QCL relationship with the channel may be, for example, at least one of a synchronization signal block (SynchronizationSignal Block (SSB)), a channel state information reference signal (CSI-RS)), a sounding reference signal (SRS), a tracking CSI-RS (also called a Tracking Reference Signal (TRS)), and a QCL detection reference signal (also called QRS).

[0066] The SSB is a signal block that includes at least one of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The SSB may also be referred to as an SS / PBCH block.

[0067] The TCI state information element (RRC's "TCI-state IE") set through high-layer signaling may also include one or more 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 (BWP) where the RS is located.

[0068] In Rel.15NR, as at least one TCI state in PDCCH and PDSCH, both QCL type A RS and QCL type D RS, or only QCL type A RS can be set for the UE.

[0069] When TRS is set as the RS for QCL Type A, it is different from the Demodulation Reference Signal (DMRS) for PDCCH or PDSCH, and it is assumed that the same TRS is transmitted periodically over a long period of time. The UE can measure TRS and calculate average delay, delay spread, etc.

[0070] 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 (average delay, delay spread, etc.) of the QCL Type A of the DMRS of the PDCCH or PDSCH are the same as those of the TRS. Therefore, the parameters (average delay, delay spread, etc.) of the Type A of the DMRS of the PDCCH or PDSCH 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.

[0071] A UE configured with a QCL type D RS can use the QCL type D RS to determine a UE reception beam (spatial reception filter, UE spatial reception filter).

[0072] 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 called a QCL source of QCL type X in the TCI state.

[0073] <TCI status for PDCCH>

[0074] The PDCCH (or the DMRS antenna port associated with the PDCCH) and information related to the QCL of a specific RS may also be referred to as the TCI state for the PDCCH, etc.

[0075] The UE may also determine the UE-specific TCI state for the PDCCH (CORESET) based on higher layer signaling. For example, for the UE, one or more (K) TCI states may be set for each CORESET via RRC signaling.

[0076] The UE may also activate one of multiple TCI states configured by 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.

[0077] <TCI status for PDSCH>

[0078] The PDSCH (or the DMRS antenna port associated with the PDSCH) and information related to the QCL of a specific DL-RS may also be referred to as the TCI state for the PDSCH, etc.

[0079] 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.

[0080] The DCI used for scheduling the PDSCH may also include a specific field indicating the TCI state for the PDSCH (which may also be referred to as, for example, a TCI field, a TCI state field, etc.). The DCI may also be used for scheduling the PDSCH of a cell and may also be referred to as, for example, DL DCI, DL assignment (downlink assignment), DCI format 1_0, DCI format 1_1, etc.

[0081] Whether the TCI field is included in the DCI may also be controlled by information notified by the base station to the UE. This information may also be information indicating whether the TCI field is present or absent in the DCI (e.g., TCI presence information, TCI presence information within DCI, or the higher-layer parameter TCI-PresentInDCI). This information may also be set to the UE, for example, via higher-layer signaling.

[0082] When more than eight TCI states are configured in the 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 TCIStatesActivation / Deactivation for UE-specific PDSCH MAC CE. The value of the TCI field in the DCI may also indicate one of the TCI states activated by the MAC CE.

[0083] When the UE sets TCI presence information to "valid (enabled)" for the CORESET that schedules PDSCH (the CORESET used to send PDCCH that schedules PDSCH), the UE may also assume that the TCI field exists in the DCI format 1_1 of the PDCCH sent on the CORESET.

[0084] When TCI presence information is not set for the CORESET that schedules the PDSCH, or when the PDSCH is scheduled through 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, the UE may also assume that in order to determine the QCL of the PDSCH antenna port, the TCI state or QCL assumption for the PDSCH is the same as the TCI state or QCL assumption applied to the CORESET that sends the PDCCH used to schedule the PDSCH.

[0085] When TCI presence information is set to "enabled", 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 when 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 given by the indicated TCI state are QCL.

[0086] In RRC connected mode, when TCI information (higher layer parameter TCI-PresentInDCI) in the DCI is set to "enabled" and when TCI information is not set in the DCI, and when the time offset between the reception of the DL DCI (DCI scheduling the PDSCH) and the corresponding PDSCH (the PDSCH scheduled by the DCI) is below a threshold, the UE may also assume that the DM-RS port of the PDSCH of the serving cell is QCL with the following RS: the RS is associated with the QCL parameters used in the QCL indication of the PDCCH of the CORESET associated with the monitored search space, and the CORESET has the smallest (lowest) CORESET-ID in the latest (latest) time slot monitored by the UE for one or more CORESETs within the active BWP of the serving cell. This RS may also be referred to as the default TCI state of the PDSCH or the default QCL assumption of the PDSCH.

[0087] 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.

[0088] In addition, the above-mentioned threshold can also be referred to as QCL time duration, "timeDurationForQCL", "Threshold", "Threshold for offset between aDCI indicating a TCI stateand a PDSCH scheduled by the DCI (threshold for the offset between aDCI indicating a TCI state and a PDSCH scheduled by the DCI)", "Threshold-Sched-Offset", scheduling offset threshold, scheduling offset threshold, etc.

[0089] The QCL duration may also be based on UE capabilities, for example, the delay in decoding the PDCCH and switching beams. The QCL duration may also be the minimum time required for the UE to receive the PDCCH and apply the spatial QCL information received in the DCI for PDSCH processing. The QCL duration may also be expressed as the number of symbols per subcarrier spacing, or as time (e.g., μs). The QCL duration information may also be reported by the UE to the base station as UE capability information, or may be set by the base station to the UE using higher-layer signaling.

[0090] For example, the UE may assume that the DMRS port of the PDSCH and the DL-RS based on the TCI state activated for the CORESET corresponding to the smallest CORESET-ID are QCL. The latest time slot may also be, for example, a time slot for receiving the DCI scheduling the PDSCH.

[0091] Alternatively, the CORESET-ID may be an ID (an ID for identifying the CORESET, controlResourceSetId) set by the RRC information element "ControlResourceSet".

[0092] When CORESET is not set for a CC, the default TCI state may be the activated TCI state that is applicable to the PDSCH within the activated DLBWP of the CC and has the lowest ID.

[0093] The present inventors focused on the transition of beams (or TCI states, QCL assumptions) in a mobile body, conducted research on communication control between the mobile body (or UE included in the mobile body) and RRH, and came up with the present embodiment.

[0094] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The structures described in each embodiment may be applied individually or in combination.

[0095] TCI state, TCI state or QCL assumption, QCL assumption, QCL parameter, spatial receive filter, UE spatial receive filter, spatial filter, UE receive beam, DL receive beam, DL precoding, DL precoder, DL-RS, QCL parameter followed by DMRS port, RS of QCL type D according to TCI state or QCL assumption, RS of QCL type A according to TCI state or QCL assumption may also be replaced with each other. RS of QCL type D, DL-RS associated with QCL type D, DL-RS of QCL type D, source of DL-RS, SSB, and CSI-RS may also be replaced with each other.

[0096] In the present disclosure, the TCI state may also be information related to the receive beam (spatial receive filter) indicated (configured) for the UE (e.g., DL-RS, QCL type, cell transmitting DL-RS, etc.). The QCL assumption may also be information related to the receive beam (spatial 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 transmitting DL-RS, etc.).

[0097] In the present disclosure, a mobile object only needs to move at a specific speed or above, and may be, for example, a train, car, motorcycle, ship, etc. Furthermore, communication between a UE included in the mobile object and a transmission point (e.g., an RRH) may be performed directly between the UE and the transmission point, or may be performed between the UE and the transmission point via the mobile object (e.g., an antenna provided in the mobile object).

[0098] In addition, in the present disclosure, "A / B" can also be replaced by at least one of A and B, and "A / B / C" can also be replaced by at least one of A, B, and C.

[0099] (First Method)

[0100] In the first embodiment, a case where a UE (for example, a terminal included in a mobile body) controls communication with a transmission point (for example, an RRH) based on information related to beam transition will be described.

[0101] Figure 2AThis example shows a scenario where a mobile object communicates with transmission points (here, RRH #1 and RRH #2) located along its path. Each RRH transmits DL signals / DL channels using multiple beams. Each transmission point can also be at least one of a unidirectional RRH and a bidirectional RRH.

[0102] In the following description, the case where a signal / channel is transmitted from a network (for example, RRH) to a mobile (for example, UE) (DL transmission) is taken as an example, but the invention is also applicable to UL transmission.

[0103] 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 also be notified from the network (e.g., base station, transmission point) to the UE using at least one of RRC signaling and MAC CE, or may be predefined in the specification.

[0104] Information related to beam migration may also 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 using at least one of a symbol, a slot, a subslot, a subframe, and a frame, or may be specified using units of milliseconds or micrometers. The period or time may also be replaced with a distance or an angle.

[0105] 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.

[0106] 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, there is no need to notify the UE or predefine the period corresponding to the RRH.

[0107] The TCI status and each beam period can also be associated with each other (see Figure 2B ). Figure 2BThis is a diagram showing an example of a table that associates the TCI state with the index of each beam period (for example, t0, t1, t2, t3, t4, t5).

[0108] Each beam period index (t0, t1, t2, t3, t4, t5) may correspond to a different beam. Furthermore, depending on the movement of the mobile device (UE), the beam period index may be migrated (or switched, changed, altered, or updated) in the order of t0, t1, t2, t3, t4, and t5.

[0109] Here, the case of migration in the order of TCI state #0 (t0), TCI state #1 (t1), TCI state #2 (t2), TCI state #3 (t3), TCI state #4 (t4), and TCI state #5 (t5) is shown. The UE can also assume that the TCI state (or QCL) migration is carried out according to the period corresponding to each beam in the communication with the transmission point (RRH #1, #2) to control the reception of DL transmission (see Figure 3A , B).

[0110] Figure 3A The upper figure is a diagram that considers the geographic domain in communication with RRH #1. The lower figure shows the transition of TCI states in the time direction. While the time unit (slot boundary) is described here, another time unit (e.g., at least one of symbol, subslot, subframe, frame, ms, and μm) may also be used. Figure 3B An example of a table showing set beam migration (or the association between TCI status and beam period) is shown.

[0111] The UE may also update the TCI state (or QCL assumption) based on the configured TCI state transition order when each beam period expires. For example, when communicating with RRH #1, the UE may assume TCI state #0 during the corresponding beam period (here, 4), and then switch to TCI state #1 after the beam period expires to control reception of DL signals / channels.

[0112] In communications with the transmission point (RRH #1), the UE may determine the initial beam period index (e.g., t0) or the start point of the period corresponding to the beam based on specific conditions or methods. For example, the UE (or mobile object) may determine this based on its current location obtained from GPS or a specific signal (e.g., a reference signal) transmitted from the transmission point.

[0113] In this way, the UE can control communication with the transmission point based on information related to beam migration, and can communicate appropriately even when the mobile body is moving at high speed.

[0114] <Change 1-1>

[0115] The period corresponding to the beam may also be the ratio of the period during which each beam is used at the transmission point (e.g., duration ratio, dwell ratio, dwell time ratio) (see Figure 4A , B). The UE may also control the reception of DL transmissions (e.g., the determination of the assumed TCI state or QCL) based on the ratio of the periods during which each beam is utilized at each transmission point.

[0116] The UE may not be notified or configured during the beam period. In this case, the UE may also change (or switch, modify, or update) the TCI state in a blind state based on the migration order of the TCI state (or QCL).

[0117] <Change 1-2>

[0118] The period corresponding to the RRH may also be information related to the distance or period between the RRHs (e.g., RRH#1 and RRH#2) (e.g., Distance / Duration). For example, the UE may be notified of information related to the average distance or average period between adjacent RRHs (e.g., RRH#n and RRH#n+1) (see Figure 5A Here, the case where the average distance between each RRH is represented by 3 is shown.

[0119] Alternatively, the distance between each RRH (for example, each adjacent RRH) or information related to the period may be notified or set to the UE (see Figure 5B When RRH#1 to RRH#6 are configured in the mobile path, the UE may also control the reception of DL transmissions in each RRH based on information related to the distance or period between each RRH. The above method may also be applied to the reception of DL transmissions in each RRH.

[0120] By understanding the relationship between RRHs, the UE can appropriately communicate with each RRH. In addition, information related to the distance or period between RRHs can also be notified from the base station to the UE using at least one of RRC signaling and MAC CE, or can be pre-defined in the specification.

[0121] <Changes 1-3>

[0122] The UE may also control detection (e.g., blind detection) of a specific TCI state from multiple TCI states during a certain beam period. For example, when the TCI state corresponding to beam period t is #i, detection may be performed for TCI state #i and other TCI states during the beam period t. Other TCI states may also be one or more TCI states that migrate before or after TCI state #i. TCI state #i and other TCI states may also be included in a specific window (e.g., a blind detection window).

[0123] Figure 6A This figure shows a case where TCI states are detected blindly during beam period t1, using TCI state #1 corresponding to t1 and TCI states #0 and #2 that transition before and after TCI state #1. This corresponds to a case where TCI states #1, #2, and #3 are included in the blind detection window. The range or size of the blind detection window (e.g., row, index, range or size of TCI states) can also be set by the network or predefined.

[0124] Therefore, even if there is a deviation between the beam period (or TCI state) assumed by the UE and the actual position, it is possible to communicate with the sending point based on the appropriate TCI state or QCL assumption.

[0125] <Variations 1-4>

[0126] It is also possible to correspond to multiple TCI states for each beam period (refer to Figure 6B ). Here, a situation is shown in which each beam period corresponds to more than two TCI states. The UE can also detect (for example, detect in a blind state) a specific (for example, one) TCI state from multiple TCI states during each beam period.

[0127] For example, during beam duration t0, the UE determines one TCI state from TCI states #0 and #1. The TCI state may be determined based on reception conditions (eg, reception power) when each TCI state is used.

[0128] <Variations 1-5>

[0129] For each beam period, corresponding to multiple TCI states (refer to Figure 6B ), the UE may also detect more than one TCI state based on the terminal capability. For example, if the UE supports the capability to simultaneously receive DL transmissions from multiple transmission points (multi-panel simultaneous reception), it may detect two TCI states for reception processing.

[0130] In this way, by making multiple TCI states correspond to beam periods, DL transmissions from multiple transmission points can be received simultaneously.

[0131] <Variations 1-6>

[0132] It is also possible to set multiple candidates for the TCI state corresponding to each beam period, and the TCI state to be actually applied (or assumed) is determined based on specific conditions (see Figure 7 ). Here, a case where two TCI states corresponding to each beam period are set is shown. For example, multiple transition lists of TCI states corresponding to each beam period can also be set, and the list actually used can be selected from the multiple lists.

[0133] The TCI status list may also be set from the network to the UE using at least one of higher layer signaling and MAC CE, or may be predefined by the specification. The UE may also determine one list from multiple lists based on downlink control information (DCI) or PDCCH. For example, a TCI list may be specified using a new bit field or an existing bit field included in the DCI. Alternatively, the TCI list may be selected based on the location and resource (e.g., CCE / PRB / RE index) of the DCI detected by the UE.

[0134] When a new bit field of DCI is used to specify a TCI state (or a TCI state list), the size (eg, number of bits) of the new bit field may be determined based on the number of TCI states (or TCI state lists) to be set.

[0135] If each beam period corresponds to one TCI state, a new bit field is not required (not included in the DCI). If at least one of the beam periods corresponds to multiple TCI states, a new bit field may be included in the DCI.

[0136] In this way, by selecting and utilizing one TCI list from a plurality of TCI state lists, it is possible to flexibly set the beam (or TCI state) used for communication with each RRH.

[0137] (Second Method)

[0138] In the second method, a case is described in which the UE separately determines the TCI state applied or assumed in the reception of DL transmission for each type or category of signal / channel.

[0139] The following description describes the case where the TCI state applied or assumed in PDCCH reception and the TCI state applied or assumed in PDSCH reception are determined separately. In addition, any of the following methods can also be applied to other DL signals / channels.

[0140] <PDCCH TCI status>

[0141] The UE may also determine the TCI status of the PDCCH by applying the first method (e.g., beam migration information). The beam migration information may be set separately for each control resource set (CORESET). Alternatively, the beam migration information may be set commonly for multiple control resource sets (CORESETs).

[0142] <PDSCH TCI status>

[0143] The UE may also determine the TCI status of the PDSCH using a method different from that used for the PDCCH.

[0144] For example, multiple TCI states may be set for each beam period (see Figure 8A , B). Here, a case is shown where the TCI state list is set separately for each beam period. Each TCI state list may also include multiple (here, 8 (3-bit)) TCI states. The size of the TCI state list set for each beam period (for example, the number of TCI states included in the list) may be the same or different.

[0145] The TCI state list (or one or more TCI states) corresponding to each beam period may be configured for the UE using at least one of higher layer signaling and a MAC CE, or may be defined in a specification. The TCI state may be configured separately for each beam period, and the activation / deactivation of the TCI state configured for each beam period may be notified.

[0146] In addition, when the TCI status list is set for one beam period, the TCI status list can also be applied to other beam periods (for example, all beam periods).

[0147] One or more TCI states included in the TCI state list may also be associated with code points (e.g., bit values) of specific fields in the DCI. When a received DCI (or PDCCH) includes a specific field, the UE may determine the TCI state to apply during the beam period of the PDSCH based on the code point of the specific field.

[0148] Whether a specific field is included in the DCI may also be notified via higher-layer signaling. For example, if a higher-layer parameter (e.g., tciPresentInDCI) is configured to indicate that a specific field (e.g., a TCI field) is included in the DCI, the UE may be notified of the TCI status of the PDSCH via a specific field in the DCI.

[0149] The UE may also determine the TCI status of the PDSCH based on methods other than specific fields (e.g., specific conditions or specific information) when a higher-level parameter (e.g., tciPresentInDCI) is not configured to indicate that the DCI contains a specific field (e.g., TCI field).

[0150] For example, when the DCI does not include a specific field, the UE may also determine the TCI state for PDSCH reception based on the default TCI state or the default QCL assumption (hereinafter also referred to as the default TCI state). The default TCI state may also be the TCI state corresponding to a specific control resource set (e.g., a specific control resource set in the period or time slot where the PDSCH is scheduled) (see Figure 9 ). The specific control resource set may also be the control resource set with the smallest index.

[0151] Figure 9 , shows the situation in which PDSCH is received using the default TCI state during each beam period. The default TCI state may also be the TCI state corresponding to the specific control resource set corresponding to each beam period.

[0152] Alternatively, the default TCI state may be the TCI state corresponding to a specific control resource set in the last monitored time slot (e.g., the latest monitoring slot). The specific control resource set may also be the control resource set with the smallest index. In addition, the control resource set may also be replaced by a search space.

[0153] The default TCI state may also be changed (or updated) during each beam period as shown in the first embodiment.

[0154] Alternatively, when the DCI does not include a specific field, the UE may also apply or assume a default TCI state corresponding to a specific beam period during multiple beam periods to control the reception of the PDSCH. The specific beam period may also be the beam period with the smallest index (see Figure 10 ). Here, a case is shown where TCI state #1 corresponding to the beam period (t0) with the smallest index among multiple beam periods (t0 to t5) is applied or assumed.

[0155] In addition, when there is no control resource set in the time slot of the scheduled PDSCH (or the UE cannot detect it), the TCI state corresponding to the control resource set last monitored by the UE may be selected as the TCI state for the PDSCH. That is, the UE determines the TCI state corresponding to the control resource set in the last monitoring opportunity as the default TCI state (refer to Figure 11A ).

[0156] Figure 11A In the time slot where the PDSCH is scheduled, the UE cannot detect the control resource set (or search space). Therefore, the TCI state corresponding to the control resource set that the UE last monitored (here, TCI state #1) is selected as the TCI state for PDSCH (default TCI state).

[0157] Alternatively, when there is no control resource set in the time slot of the scheduled PDSCH (or the UE cannot detect it), the TCI state corresponding to the time slot (or symbol) of the scheduled PDSCH may be selected as the TCI state for the PDSCH (refer to Figure 11B ).

[0158] Figure 11B In the case of a time slot in which the PDSCH is scheduled, the UE cannot detect the control resource set (or search space) in the time slot in which the PDSCH is scheduled. Therefore, the TCI state (here, TCI state #2) for the beam period corresponding to the time slot (or symbol) in which the PDSCH is scheduled is selected as the TCI state for the PDSCH (the default TCI state). In addition, if there are multiple TCI states for the beam period corresponding to the time slot (or symbol) in which the PDSCH is scheduled, a specific TCI state (e.g., the TCI state with the smallest index) may be selected.

[0159] Alternatively, when there is no control resource set in the time slot of the scheduled PDSCH (or the UE cannot detect it), the TCI state corresponding to the code element of the scheduled PDSCH may be selected as the TCI state for the PDSCH (refer to Figure 12A , B).

[0160] Figure 12A , the case where the TCI state corresponding to at least one of the first and last symbols of the scheduled PDSCH (here, the first symbol) is selected is shown. Specifically, the UE may also select the TCI state for the beam period corresponding to the first symbol of the scheduled PDSCH (here, TCI state #2) as the TCI state for the PDSCH (default TCI state). In addition, the first symbol of the scheduled PDSCH may be replaced with the first symbol of the demodulation reference signal (DMRS) for the PDSCH.

[0161] Figure 12B In the IEEE 802.11a protocol, the TCI state (here, TCI states #2 and #3) for each beam period corresponding to each symbol of the scheduled PDSCH is selected as the TCI state for the PDSCH (the default TCI state). In other words, PDSCH reception is performed by taking into account multiple TCI states in the time direction. By taking into account multiple TCI states when receiving the PDSCH, PDSCH reception can be performed more appropriately.

[0162] Alternatively, the PDSCH-scheduled symbols may be replaced with symbols assigned a demodulation reference signal (DMRS) for the PDSCH. In this case, if the PDSCH includes multiple DMRSs, the TCI state corresponding to each DMRS symbol may be considered to control PDSCH reception.

[0163] The second approach can also be applied to UL transmission. In this case, the default TCI state (or QCL assumption) of the PDSCH can also be replaced by the reference signal of the PUCCH (such as PL-RS), SRS, or the default spatial relation of the PUSCH.

[0164] (Third Method)

[0165] In the third embodiment, the UE operation is described in the case where the UE is not notified of information related to the beam period (for example, only information related to the migration of the TCI state is notified as beam migration information). In addition, the beam period can also be replaced by the migration period of the TCI state, the switching period of the TCI state, or the continuous period of the TCI state.

[0166] Without being notified of information related to the beam period (e.g., the value of each beam period), the UE may also blindly detect at least one of each beam period and each RRH period. For example, the UE may obtain each beam period based on a specific signal / specific condition / specific information, and control the reception of DL transmission based on the obtained beam period and the transition sequence of TCI states defined by notification or specification from the network (see Figure 13A , B).

[0167] Figure 13B An example of information related to beam migration (e.g., migration information of TCI state) notified to the UE is shown. The UE may also determine the beam duration or RRH duration corresponding to each TCI state based on at least one of the following options 1 to 4.

[0168] <Option 1>

[0169] The UE may also determine the duration of each beam based on a specific signal (or resources used for the specific signal). The specific signal may also be a reference signal (DL RS). The reference signal may also be at least one of a synchronization signal block, CSI-RS, TRS, PT-RS, and DMRS.

[0170] For example, the UE may determine the beam period / RRH period (hereinafter also referred to as beam period) based on the reference signal resource (e.g., a specific frequency resource) or the measurement result of the reference signal transmitted using the reference signal resource. Alternatively, one (or common) reference signal resource may be set for multiple beam periods (see Figure 14 ). The UE may also determine the configured reference signal resources based on the reference signal resource structure information notified from the network.

[0171] Figure 14 , a case where one reference signal resource (e.g., a resource with the same frequency and period) is configured in multiple beam periods is shown. Reference signal resources may also be configured, triggered, or activated periodically, semi-persistently, or aperiodically.

[0172] The UE may also measure or monitor the configured reference signal resources and determine the beam duration (or TCI state transition period) based on the measurement or monitoring results. For example, the UE may compare the measurement results of each reference signal resource and determine the range of each beam duration based on the difference in measurement results between different reference signal resources. The measurement or monitoring result may also be at least one of received power (RSRP), received quality (RSRQ), and received channel quality (SINR).

[0173] If the difference in measurement results between different reference signal resources (e.g., reference signal resources adjacent in time) is less than a specific value, the UE may determine that the reference signal resources belong to the same beam period (or that the TCI state has not been transitioned). On the other hand, if the difference in measurement results between different reference signal resources is greater than a specific value, the UE may determine that the reference signal resources belong to different beam periods (or that the TCI state has been transitioned). Furthermore, the specific value that serves as a criterion for determining the measurement results may be defined by a specification or notified to the UE by the network.

[0174] Figure 14 In the example, the measurement results of the reference signal resources sent during the beam period corresponding to TCI#0 and the measurement results of the reference signal resources sent during the period corresponding to TCI#1 are greater than a specific value, so the UE can grasp the period corresponding to each TCI state based on the measurement results.

[0175] Option 2

[0176] Option 1 shows the case where a common reference signal resource (or reference signal resource structure) is set in periods corresponding to multiple TCI states (e.g., multiple beam periods), but the present invention is not limited thereto. Different reference signal resources (or reference signal resource structures) may be set or used for periods corresponding to different TCI states (e.g., each beam period) (see Figure 15 ).

[0177] Figure 15 , the case where reference signal resources (here, three different reference signal resource structures) are set corresponding to the number of beam periods (here, three) is shown. Different reference signal resources may also be, for example, three reference signal resources in different frequency domains.

[0178] The UE may also measure the RSRP / RSRQ / SINR of each reference signal resource during a set measurement instance / time, and determine the beam duration (or TCI state transition) based on the resource index where the reference signal can be detected / measured / received during each measurement opportunity. The UE may also determine, among multiple reference signal resources, that a reference signal is transmitted in a reference signal resource for which the measurement result is greater than a specific value.

[0179] Figure 15 In the example, when the UE detects a reference signal in the first reference signal resource (RS resource #1), it may be determined that it is the beam period corresponding to TCI #0 (for example, t0). Similarly, when the UE detects a reference signal in the second reference signal resource (RS resource #2), it may be determined that it is the beam period corresponding to TCI #1 (for example, t1), and when the UE detects a reference signal in the third reference signal resource (RS resource #3), it may be determined that it is the beam period corresponding to TCI #2 (for example, t2).

[0180] The base station may also control not to transmit multiple reference signals using different reference signal resources in the same time interval (e.g., at least one of the same symbol, subslot, slot, slot, and frame). The UE may also assume that multiple reference signals using different reference signal resources are not transmitted in the same time interval (e.g., at least one of the same symbol, subslot, slot, slot, and frame).

[0181] Option 3

[0182] Option 2 illustrates the case where reference signal resources (here, three different reference signal resource structures) are configured to correspond to the number of beam periods (here, three), but the present invention is not limited thereto. The number of configured reference signal resources (or reference signal resource structures) may be less than the number of beam periods.

[0183] For example, two reference signal resources may be set for multiple beam periods (or multiple TCI states of migration). In this case, different reference signal resources are applied to adjacent beam periods (or reference signals are configured for different reference signal resources) (see Figure 16 ).

[0184] Figure 16 , it is shown that two reference signal resources (RS resources #1 and #2) are set in multiple beam periods (or TCI states), and different RS resources are applied in adjacent beam periods.

[0185] The UE may also determine that it is the beam period corresponding to TCI#0 (e.g., t0) when the reference signal is detected in the first reference signal resource (RS resource #1). Subsequently, the UE may also determine that it is transitioning from TCI#0 (e.g., t0) to TCI#1 (e.g., t1) when the reference signal is detected in the second reference signal resource (RS resource #2) rather than the first reference signal resource. Subsequently, the UE may also determine that it is transitioning from TCI#1 (e.g., t1) to TCI#2 (e.g., t2) when the reference signal is detected in the first reference signal resource rather than the second reference signal resource.

[0186] By reducing the number of reference signal resources to fewer than the number of beam periods (or the number of TCI state transitions), beam periods (or TCI states) can be detected using fewer reference signal resources, thereby achieving efficient resource utilization.

[0187] <Option 4>

[0188] The switching (or change) of the beam period corresponding to each TCI state can also be notified to the UE using DCI. For example, the switching of the beam period can be notified to the UE using a new field included in the DCI (such as the duration / QCL change indicator field). Alternatively, the switching of the beam period can be notified to the UE using an existing bit field of the DCI (such as the reserved bit field).

[0189] Alternatively, the switching of beam periods may be notified to the UE based on the type of RNTI corresponding to the DCI (for example, the RNTI used in CRC scrambling) and at least one of the DCI formats.

[0190] Alternatively, the UE may determine the switching during the beam period based on the detected DCI location and at least one of the resources. The DCI location and at least one of the resources may also be at least one of a CCE index, a PRB index, a resource element index, a search space index, and a CORESETID.

[0191] <Switching Timing>

[0192] When the UE switches or updates the beam period (or TCI state / QCL assumption) based on at least one of options 1 to 4, the switching timing (Timing / timeline) of the beam period may also be controlled based on at least one of the following timings 1 to 4 (see Figure 17 ).

[0193] <Timer 1>

[0194] When a UE detects a different TCI state (or TCI state transition) based on a reference signal resource, it can switch the TCI state (or beam duration) based on the reference signal resource (or symbol). In this case, TCI state transition can be performed quickly.

[0195] <Timer 2>

[0196] When the UE detects a different TCI state (or a transition between TCI states) based on a reference signal resource, it may switch the TCI state (or beam duration) based on the next reference signal resource (or symbol). In this case, the UE can ensure sufficient processing time for the switching process.

[0197] <Timer 3>

[0198] When a UE detects a different TCI state (or TCI state transition) based on a reference signal resource, it may switch the TCI state (or beam duration) based on at least one of a slot boundary, a subslot boundary, or a subframe boundary containing the reference signal resource (or symbol). In this case, TCI state transition can be performed rapidly.

[0199] <Timer 4>

[0200] When a UE detects a different TCI state (or a TCI state transition) based on a reference signal resource, it may switch the TCI state (or beam duration) based on at least one of the next slot boundary, subslot boundary, or subframe boundary containing the reference signal resource (or symbol). In this case, sufficient processing time for the UE to perform the switching process can be ensured.

[0201] (Wireless Communication System)

[0202] 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 one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0203] Figure 18 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.

[0204] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technologies) (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0205] 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.

[0206] 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)).

[0207] 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 located 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 arrangement 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.

[0208] 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).

[0209] 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 (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 this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0210] Furthermore, the user terminal 20 may communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0211] Multiple base stations (e.g., RRHs) 10 may be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (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 the relay station, may also be referred to as an IAB node.

[0212] 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).

[0213] The user terminal 20 may also be a user terminal that supports at least one of the communication modes such as LTE, LTE-A, and 5G.

[0214] 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.

[0215] 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 applied to the UL and DL radio access schemes.

[0216] In the wireless communication system 1, as downlink channels, 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. can also be used.

[0217] In addition, in the wireless communication system 1, as uplink channels, 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. can also be used.

[0218] The PDSCH is used to transmit user data, higher-layer control information, and system information blocks (SIBs). The PUSCH can also be used to transmit user data, higher-layer control information, and the PBCH can also be used to transmit master information blocks (MIBs).

[0219] 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.

[0220] 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, PDSCH may also be replaced by DL data, and PUSCH may also be replaced by UL data.

[0221] 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.

[0222] A search space may also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Furthermore, 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.

[0223] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., hybrid automatic repeat request acknowledgment (HARQ-ACK)), ACK / NACK, etc.), and a scheduling request (SR) may also be transmitted via the PUCCH. A random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

[0224] 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.

[0225] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0226] 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.

[0227] In addition, in the wireless communication system 1, as an 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).

[0228] (Base Station)

[0229] Figure 19 This 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.

[0230] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the base station 10 can also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0231] 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 the common knowledge in the technical field to which this disclosure relates.

[0232] 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.

[0233] 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 the common knowledge in the technical field involved in this disclosure.

[0234] 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.

[0235] The transmitting and receiving antenna 130 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0236] 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.

[0237] 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.

[0238] 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.

[0239] 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, 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.

[0240] 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 .

[0241] 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 .

[0242] 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.

[0243] 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.

[0244] 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.

[0245] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0246] The sending and receiving unit 120 may also send at least one of information related to the migration of multiple sending setting indication states, i.e., multiple TCI states, which can be used in DL transmission sent from one or more sending points configured in the mobile path, information related to the periods corresponding to each of the multiple TCIs, and information related to the period corresponding to the sending point.

[0247] The transmitting and receiving unit 120 may also transmit information related to transitions of multiple transmission configuration indication states, ie, multiple TCI states, which can be used in DL transmissions transmitted from one or more transmission points arranged in the moving path.

[0248] The control unit 110 may also control the TCI state for DL transmission based on the transition of the TCI state.

[0249] The control unit 110 may control transmission of at least one of a plurality of DL reference signals and downlink control information used to identify periods corresponding to respective plurality of TCI states.

[0250] (User Terminal)

[0251] Figure 20 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, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided in one or more units.

[0252] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the user terminal 20 may also be assumed to have other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0253] 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 the common knowledge in the technical field to which this disclosure relates.

[0254] 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.

[0255] 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 the common knowledge in the technical field involved in this disclosure.

[0256] The transmitting and receiving unit 220 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 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0257] The transmitting and receiving antenna 230 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0258] 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.

[0259] 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.

[0260] 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.

[0261] 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.

[0262] 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 activated (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may also 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 also perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0263] 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 .

[0264] 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 .

[0265] 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.

[0266] 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.

[0267] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0268] The sending and receiving unit 220 can also receive at least one of information related to the migration of multiple transmission setting indication states, i.e., multiple TCI states, which can be used in DL transmissions sent from one or more transmission points configured in the mobile path, information related to the periods corresponding to each of the multiple TCIs, and information related to the period corresponding to the transmission point.

[0269] The transmitting and receiving unit 220 may also receive information related to transitions of multiple transmission configuration indication states, ie, multiple TCI states, which can be used in DL transmissions transmitted from one or more transmission points arranged in the moving path.

[0270] The control unit 210 may also control the reception of the DL transmission transmitted from the transmission point based on the received information. For example, the control unit 210 may also control so that when at least one of the periods corresponding to the multiple TCIs and the periods corresponding to the transmission point expires, the assumption of the TCI state for the DL transmission is changed. In addition, the control unit 210 may control the reception of some DL transmissions based on the received information, and control the reception of other DL transmissions based on the TCI state notified through the downlink control information or the default TCI state. A different list of TCI states may also be set for each period corresponding to the multiple TCIs.

[0271] The control unit 210 may also determine the period corresponding to each of the multiple TCI states based on at least one of the multiple DL reference signals and the downlink control information. The multiple DL reference signals may also be transmitted using common resources. The multiple DL reference signals may also be transmitted using different resources for each period corresponding to each of the multiple TCI states. The control unit 210 may also determine the period corresponding to each of the multiple TCI states based on the difference in measurement results of the multiple reference signals and at least one of the resources used for the multiple reference signals.

[0272] (Hardware Structure)

[0273] 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.

[0274] 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.

[0275] 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 21 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.

[0276] 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 be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0277] 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.

[0278] 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.

[0279] 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 aforementioned control unit 110 (210) and the transmitting and receiving unit 120 (220) may also be implemented by the processor 1001.

[0280] 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 the program. 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.

[0281] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate 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 can store executable programs (program code), software modules, etc. for implementing the wireless communication method according to one embodiment of the present disclosure.

[0282] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical / magnetic 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 appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0283] 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 be configured to 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) and the transmitting and receiving antenna 130 (230) may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated from the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0284] 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).

[0285] 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.

[0286] Furthermore, the base station 10 and 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). Such hardware may be used to implement part or all of the functional blocks. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0287] (Variation)

[0288] 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.

[0289] 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).

[0290] 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, specific windowing processing performed by the transmitter and receiver in the time domain, and the like.

[0291] 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.

[0292] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed 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 be composed 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 a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0293] 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.

[0294] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. In other words, at least one of the subframe and the TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing the TTI can also be called a time slot, a mini-time slot, etc. instead of a subframe.

[0295] 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.

[0296] 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.

[0297] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) may also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling may also be controlled.

[0298] 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.

[0299] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be interpreted as TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be interpreted as TTI with a TTI length smaller than long TTI and greater than 1ms.

[0300] 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 can also be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers included in an RB can also be determined based on the parameter set.

[0301] 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.

[0302] 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.

[0303] 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.

[0304] 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 parameter set within a 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.

[0305] 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.

[0306] 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, "cell," "carrier," etc. in this disclosure may also be interpreted as "BWP."

[0307] 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.

[0308] 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.

[0309] In this disclosure, the names used for parameters, etc., are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters, etc., 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.

[0310] 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.

[0311] Furthermore, information, signals, etc. can be output from a higher layer (upper layer) to a lower layer (lower layer), or from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0312] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. can be overwritten, updated, or appended. Output information, signals, etc. can also be deleted. Input information, signals, etc. can also be sent to other devices.

[0313] 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.

[0314] 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 RRC message, for example, RRC Connection Setup message, RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using MAC Control Element (CE), for example.

[0315] 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).

[0316] 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).

[0317] Whether software is called software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0318] 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.

[0319] 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).

[0320] 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.

[0321] 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, a small cell, a femto cell, or a pico cell.

[0322] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area 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 (Remote Radio Head (RRH)) for indoor use). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of at least one of a base station and a base station subsystem providing communication services within that coverage area.

[0323] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0324] A mobile station is also sometimes referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate terminology.

[0325] 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 vehicle (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 may also include 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.

[0326] In addition, the base station in the present disclosure can also be interpreted as a user terminal. For example, the various methods / implementations of the present disclosure can 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, it can also be called device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be interpreted as side channels.

[0327] Likewise, the user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may also have the functions of the user terminal 20 described above.

[0328] 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 including a base station, various actions 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.

[0329] 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 elements of various steps described in this disclosure are presented in an illustrative order, but are not limited to the specific order presented.

[0330] 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.).

[0331] 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.”

[0332] 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. Therefore, reference to a first and a second element does not necessarily imply that only two elements may be used, or that the first element necessarily takes precedence over the second element in some manner.

[0333] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also be considered as "judging," calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0334] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0335] In addition, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on some actions.

[0336] In addition, "judgment (decision)" can also be interpreted as "assuming", "expecting", "considering", etc.

[0337] As used in this disclosure, the terms "connected," "coupled," and all variations 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 also be interpreted as "access."

[0338] In the present disclosure, when two elements are connected, it can be considered that they are "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.

[0339] 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 as meaning "different."

[0340] In this disclosure, when the terms "include," "including," and variations thereof are used, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0341] 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.

[0342] 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, characterized in that: have: a receiving unit configured to receive, using at least one of radio resource control (RRC) signaling and a MAC control element (MAC CE), information related to an order of transition of multiple transmission configuration indication (TCI) states corresponding to multiple beams, the multiple TCI states being usable in DL transmissions transmitted from one or more transmission points, the one or more transmission points being arranged in a moving path; and A control unit that determines a period corresponding to each of the plurality of TCI states based on information about the order of transition of the plurality of TCI states and a plurality of DL reference signals, and controls reception of DL transmission using the plurality of beams.

2. The terminal according to claim 1, wherein The multiple DL reference signals are transmitted using common resources.

3. The terminal according to claim 1, wherein The plurality of DL reference signals are transmitted using different resources for each period corresponding to each of the plurality of TCI states.

4. The terminal according to any one of claims 1 to 3, characterized in that: The control unit determines a period corresponding to each of the plurality of TCI states based on at least one of a difference between measurement results of the plurality of reference signals and resources used for the plurality of reference signals.

5. A wireless communication method, characterized in that: have: receiving, using at least one of radio resource control (RRC) signaling and a MAC control element (MAC CE), information regarding an order of transition of multiple transmission configuration indication (TCI) states corresponding to multiple beams, the multiple TCI states being usable in DL transmissions transmitted from one or more transmission points, the one or more transmission points being arranged in a moving path; and A step of determining a period corresponding to each of the plurality of TCI states based on information on the order of transition of the plurality of TCI states and a plurality of DL reference signals, and controlling reception of DL transmission using the plurality of beams.

6. A base station, characterized in that: have: a transmitting unit configured to transmit, using at least one of radio resource control (RRC) signaling and a MAC control element (MAC CE), information related to an order of transition of multiple transmission configuration indication (TCI) states corresponding to multiple beams, the multiple TCI states being usable in DL transmissions transmitted from one or more transmission points, the one or more transmission points being arranged in a moving path; and a control unit that controls the transmission of multiple DL reference signals used in the identification of periods corresponding to each of the multiple TCI states, the transmission of information related to the order of migration of the multiple TCI states, and performs DL transmission using the multiple beams.

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