User terminal and wireless communication method

Abstract

In order to switch a TCI state, a QCL assumption, or a beam of a channel at high speed, a user terminal according to an embodiment of the present disclosure includes a reception unit that repeatedly receives a specific reference signal associated with a transmission configuration indicator (TCI) state using different reception spatial domain filters over a specific time domain, and a control unit that controls reception of a downlink physical channel using a specific reception spatial domain filter determined based on the repeated reception of the specific reference signal.

Description

[0001] This application is a divisional application of the invention patent application filed on November 2, 2018, with application number 201880099194.1 and title "User Terminal and Wireless Communication Method". Technical Field

[0002] This disclosure relates to user terminals and wireless communication methods in next-generation mobile communication systems. Background Technology

[0003] In UMTS (Universal Mobile Telecommunications System) networks, LTE (Long Term Evolution) was standardized with the aim of further increasing data rates and reducing latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) was standardized with the aim of further increasing capacity and improving the height of LTE (3GPP Rel. 8, 9).

[0004] The development of successor systems to LTE is also underway (e.g., also known as 5G (5th generation mobile communication system), 5G+, NR (New Radio), 3GPP e1.15 and later, etc.).

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 36.300V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] In future wireless communication systems (hereinafter referred to as NR), research is underway to determine the quasi-co-location (QCL) relationship of the channel or signal based on the state of the Transmission Configuration Indicator (TCI) to control the transmission and reception processing.

[0010] However, regarding Rel-15 NR, the TCI state control methods studied so far require relatively long times or communication overhead for TCI state changes. Therefore, there are concerns about reduced communication throughput in situations requiring frequent TCI state changes.

[0011] Therefore, one of the purposes of this disclosure is to provide a user terminal and wireless communication method capable of high-speed switching of TCI states, QCL concepts, or beams.

[0012] Methods for solving problems

[0013] One aspect of the user terminal disclosed herein is characterized by comprising: a receiving unit that, throughout a specific time domain, repeatedly receives a specific reference signal associated with a state of a transmission configuration indicator (TCI); and a control unit that controls the reception of a downlink physical channel by applying a specific receiving spatial filter determined based on the repeated reception of the specific reference signal.

[0014] One aspect of the wireless communication method disclosed herein is characterized by having the following steps: repeatedly receiving and transmitting a specific reference signal associated with a set indication state, i.e., a TCI state, over a specific time domain using different receive spatial filters; and applying a specific receive spatial filter determined based on the repeated reception of the specific reference signal to control the reception of the downlink physical channel.

[0015] The effects of the invention

[0016] According to one aspect of this disclosure, it is possible to switch the TCI state, QCL assumption, or beam of a channel at high speed. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating an example of beam-managed PDCCH in Rel-15 NR.

[0018] Figure 2 This is a diagram illustrating an example of a reference signal set as a TCI state.

[0019] Figure 3 This is another example of a reference signal set as a TCI state.

[0020] Figure 4 This is another example of a reference signal set as a TCI state.

[0021] Figure 5 This is another example of a reference signal set as a TCI state.

[0022] Figure 6 This is a diagram illustrating an example of a change operation for the TCI state (QCL concept).

[0023] Figure 7 This is another example of a reference signal set as a TCI state.

[0024] Figure 8 This is another example of a change operation for the TCI state (QCL concept).

[0025] Figure 9 This is another example of a change operation for the TCI state (QCL concept).

[0026] Figure 10 This is another example of a change operation for the TCI state (QCL concept).

[0027] Figure 11 This is another example of a change operation for the TCI state (QCL concept).

[0028] Figure 12 This is another example of a change operation for the TCI state (QCL concept).

[0029] Figure 13 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment.

[0030] Figure 14 This is a diagram illustrating an example of the structure of a base station according to one embodiment.

[0031] Figure 15 This is a diagram illustrating an example of the structure of a user terminal according to one embodiment.

[0032] Figure 16 This is a diagram illustrating an example of the hardware structure of a base station and a user terminal according to one embodiment. Detailed Implementation

[0033] (CORESET)

[0034] In NR, in order to send physical layer control signals (e.g., downlink control information (DCI)) from the base station to the user terminal (user equipment (UE)), a control resource set (CORESET) is used.

[0035] A CORESET is a candidate region for allocating control channels (e.g., PDCCH (Physical Downlink Control Channel)). A CORESET can also consist of specific frequency domain resources and time domain resources (e.g., one or two OFDM symbols).

[0036] The UE can also receive CORESET configuration information (also known as CORESET configuration or coreset-Config) from the base station. If the UE monitors the CORESET configured for its own terminal, it can detect physical layer control signals.

[0037] CORESET settings can be communicated via higher-level signaling or represented by a specific RRC information element (also known as "ControlResourceSet").

[0038] Here, higher-layer signaling can be, for example, one or a combination of RRC (Radio Resource Control) signaling, MAC (Media Access Control) signaling, broadcast information, etc.

[0039] MAC signaling can also use MAC control elements (MAC CE) or MAC PDUs (Protocol Data Units). Broadcast information can also be, for example, the Master Information Block (MIB), the System Information Block (SIB), or the Remaining Minimum System Information (RMSI).

[0040] You can also set a specific number (e.g., less than 3) of CORESETs for each bandwidth part (BWP) assigned to the UE in the serving cell.

[0041] The search area and search method for PDCCH candidates are defined as the search space (SS). The UE can also receive search space configuration information (also known as search space configuration) from the base station. Search space configuration can also be notified via higher-layer signaling (RRC signaling, etc.).

[0042] The UE monitors the CORESET based on the search space settings. The UE can determine the correspondence between the CORESET and the search space based on the CORESET-ID included in the search space settings. One CORESET can also be associated with one or more search spaces.

[0043] (QCL / TCI)

[0044] In NR, research is underway on reception processing (e.g., at least one of receiving, demapping, demodulation, and decoding) based on at least one of the transmission configuration indication state (TCI state) and the control signal and the channel (referred to as signal / channel).

[0045] Here, the TCI state refers to information related to the quasi-co-location (QCL) of a channel or signal, also known as spatial reception parameters, spatial relation information, etc. The TCI state can be set for the UE on a per-channel or per-signal basis. The UE can also determine at least one of the transmit beam (Tx beam) and receive beam (Rx beam) for a channel based on its TCI state.

[0046] QCL refers to an indicator that describes the statistical properties of a signal / channel. For example, if a signal / channel has a QCL relationship with other signals / channels, it can also mean that at least one of the following is the same among these different signals / channels: Doppler shift, Doppler spread, average delay, delay spread, and spatial parameter (e.g., spatial Rx parameter). (At least one of these is called the QCL.)

[0047] Alternatively, spatial reception parameters may correspond to the UE's receive beam (e.g., receive analog beam), or the beam may be determined based on the spatial QCL. The QCL (or at least one element of the QCL) in this disclosure may also be interpreted as sQCL (spatial QCL).

[0048] Regarding QCLs, multiple types (QCL types) can also be specified. For example, four QCL types (ADs) can be set up, in which parameters (or parameter sets) that can be assumed to be the same are different. The following shows the parameters:

[0049] • QCL Type A: Doppler shift, Doppler spread, average delay, and delay spread.

[0050] • QCL Type B: Doppler shift and Doppler extension,

[0051] • QCL Type C: Doppler shift and average delay,

[0052] • QCL type D: Space reception parameters.

[0053] The TCI status can also be information related to the QCL of the target channel (or the reference signal (RS) used by that channel) and other signals (e.g., other downlink reference signals (DL-RS)). The TCI status can also be set (indicated) by higher layer signaling, physical layer signaling, or a combination of these.

[0054] In this disclosure, higher-level signaling may be, for example, one or a combination of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, etc.

[0055] MAC signaling can also use MAC control elements (MAC CE) or MAC PDUs (Protocol Data Units). Broadcast information can also be, for example, the Master Information Block (MIB), the System Information Block (SIB), the Remaining Minimum System Information (RMSI), or Other System Information (OSI).

[0056] Physical layer signaling can also be, for example, downlink control information (DCI).

[0057] The channel that has been set (designated) to TCI state can be at least one of the following: downlink shared channel (Physical Downlink Shared Channel (PDSCH)), downlink control channel (Physical Downlink Control Channel (PDCCH)), uplink shared channel (Physical Uplink Shared Channel (PUSCH)), and uplink control channel (Physical Uplink Control Channel (PUCCH)).

[0058] Furthermore, the RS (DL-RS) that forms a QCL relationship with this channel can be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), or a Measurement Reference Signal (SRS). Alternatively, the DL-RS can also be a CSI-RS (also known as a TRS) used for tracking, or a reference signal (also known as a QRS) used for QCL detection.

[0059] An SSB is a block of signals that contains at least one primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a broadcast channel (physical broadcast channel (PBCH)). An SSB can also be called an SS / PBCH block.

[0060] The TCI state information element (RRC's "TCI-state IE") set via higher-layer signaling may also contain one or more QCL information ("QCL-Info"). The QCL information may also contain at least one information related to the DL-RS that forms a QCL relationship (DL-RS association information) and information indicating the QCL type (QCL type information). The DL-RS association information may also contain information such as the DL-RS index (e.g., SSB index, non-zero power CSI-RS resource ID), the cell index where the RS is located, and the BWP (Bandwidth Part) index where the RS is located.

[0061] Information related to the PDCCH (or the DMRS antenna port associated with the PDCCH) and the QCL of a specific DL-RS can also be referred to as the PDCCH TCI status, etc.

[0062] The UE can also determine the TCI status of the UE-specific PDCCH (CORESET) based on RRC signaling and MAC CE.

[0063] For example, the UE can set one or more (K) TCI states for each CORESET via higher-layer signaling (ControlResourceSet information element). Alternatively, the UE can activate a TCI state for each CORESET using a separate MAC CE. This MAC CE can also be called a UE-specific PDCCH TCI state indication MAC CE (TCI State Indication for UE-specific PDCCH MACCE). The UE can also monitor the CORESET based on the activated TCI states corresponding to that CORESET (e.g., one TCI state).

[0064] TCI states can also correspond to beams. For example, the UE can also be designed so that PDCCHs in different TCI states are transmitted using different beams.

[0065] Information related to the PDSCH (or the DMRS antenna port associated with the PDSCH) and the QCL of a specific DL-RS can also be referred to as the TCI status for the PDSCH, etc.

[0066] The UE can also be notified (set) M (M≥1) TCI states (M QCL information used by PDSCH) for PDSCH via higher-layer signaling. In addition, the number M of TCI states set to the UE can also be limited by at least one of the UE capability and QCL type.

[0067] The DCI used in PDSCH scheduling can also contain specific fields representing the TCI status (QCL information used by PDSCH) (e.g., it can also be called the TCI field, TCI field, TCI status field, etc.). This DCI can also be used for PDSCH scheduling of a single cell, for example, it can also be called DL DCI, DL allocation, DCI format 1_0, DCI format 1_1, etc.

[0068] Furthermore, in cases where the DCI includes a TCI field of x bits (e.g., x = 3), the base station can also use higher-layer signaling to transmit a maximum of 2 bits. x (For example, in the case of x=3, it is 8) types of TCI states are pre-set to the UE. The value of the TCI field in the DCI (TCI field value) can also represent a TCI state that is pre-set via higher-layer signaling.

[0069] When more than eight TCI states are assigned to the UE, a MAC CE can be used to activate (or specify) fewer than eight TCI states. This MAC CE can also be called a UE-specific PDSCH TCI state activation / deactivation MAC CE (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field within the DCI can also represent one of the TCI states activated by the MAC CE.

[0070] The UE can also determine the QCL of the PDSCH (or the DMRS port of the PDSCH) based on the TCI state represented by the TCI field value in the DCI. For example, the UE can also assume that the DMRS port (or DMRS port group) of the serving cell's PDSCH and the DL-RS corresponding to the TCI state notified by the DCI are QCLs to control the reception processing of the PDSCH (e.g., decoding, demodulation, etc.).

[0071] (Beam Management)

[0072] Currently, beam management (BM) methods are being investigated in Rel-15 NR. This beam management involves beam selection based on the L1-RSRP reported by the UE. Changing (switching) the beam of a signal / channel is equivalent to changing the TCL state (QCL) of that signal / channel.

[0073] Furthermore, the beam selected through beam selection can be either a transmit beam (Tx beam) or a receive beam (Rx beam). Additionally, the beam selected through beam selection can be either the UE's beam or the base station's beam.

[0074] The UE can also include L1-RSRP in the CSI and use the uplink control channel (Physical Uplink Control Channel (PUCCH)) or the uplink shared channel (Physical Uplink Shared Channel (PUSCH)) for reporting.

[0075] Additionally, CSI may include at least one of the following: Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), CSI-RS Resource Indicator (CRI), SS / PBCH Block Indicator (SSBRI), Layer Indicator (LI), Rank Indicator (RI), L1-RSRP, etc.

[0076] Measurement results reported for beam management purposes (e.g., CSI) can also be referred to as beam measurement, beam measurement results, beam measurement report, beam report, etc.

[0077] The UE can also use resources for CSI measurement to measure channel state and derive L1-RSRP. Resources for CSI measurement can be, for example, at least one of SS / PBCH block resources, CSI-RS resources, or other reference signal resources. CSI measurement report configuration information can also be set for the UE using higher-layer signaling.

[0078] The configuration information (CSI-MeasConfig or CSI-ResourceConfig) of the CSI measurement report may also include information such as one or more non-zero power (NZP) CSI-RS resource sets (NZP-CSI-RS-ResourceSet), one or more zero power (ZP) CSI-RS resource sets (ZP-CSI-RS-ResourceSet) (or CSI-IM (Interference Management) resource sets (CSI-IM-ResourceSet)) and one or more SS / PBCH block resource sets (CSI-SSB-ResourceSet) for CSI measurements.

[0079] The information for each resource set can also include information related to repetitions within the resources of that resource set. Information related to this repetition can, for example, indicate "on" or "off". Additionally, "on" can also be expressed as "activated" or "valid", and "off" can be expressed as "deactivated" or "disabled".

[0080] For example, for a resource set that is repeatedly set to "on", the UE may also assume that the resources within that resource set are transmitted using the same downlink spatial domain transmission filter. In this case, the UE may also assume that the resources within that resource set are transmitted using the same beam (e.g., from the same base station using the same beam).

[0081] For resource sets that are repeatedly set to "off", the UE can also control them by preventing (or not assuming) that resources within that resource set are transmitted using the same downlink spatial domain transmission filter. In this case, the UE can also assume that resources within that resource set are not transmitted using the same beam (but rather using different beams). That is, for resource sets that are repeatedly set to "off", the UE can also assume that the base station is performing beam scanning.

[0082] Figure 1 This diagram illustrates an example of PDCCH beam management in Rel-15 NR. The NW (network, such as a base station) decides to switch the PDCCH state of a UE using the TCI (step S101). The NW then sends a DCI for PDSCH scheduling to the UE using the PDCCH in the old (pre-switching) TCI state (step S102).

[0083] In addition, the base station includes a UE-specific PDCCH with TCI status indication MAC CE in the PDSCH for transmission (step S103).

[0084] When the UE detects the aforementioned DCI, it decodes the aforementioned PDSCH to obtain the aforementioned MAC CE. When the UE receives the aforementioned MAC CE, it sends a HARQ-ACK (Hybrid Automatic Repeat reQuest Acknowledgement) for the PDSCH that provided the MAC CE (step S104). Three milliseconds after sending the HARQ-ACK, the UE applies an activation command based on the TCI state of the aforementioned MAC CE (step S105).

[0085] Then, the base station sends a PDCCH according to the new (handover) TCI state, and the UE is able to receive and decode the PDCCH (step S106).

[0086] As explained above, regarding Rel-15 NR, the TCI state control methods used in PDCCH that have been studied so far require a relatively long time to change the TCI state. Furthermore, for other channels (PDSCH, PUCCH, etc.), changing the TCI state also requires a relatively long time or incurs communication overhead. Therefore, in situations requiring frequent TCI state changes, there are concerns that the latency involved in these changes will become a problem, leading to a decrease in communication throughput.

[0087] Therefore, the inventors of this invention conceived of methods for rapidly switching the TCI state of a channel, QCL concept, or beamforming.

[0088] Hereinafter, embodiments related to this disclosure will be described in detail with reference to the accompanying drawings. The structures shown in each embodiment can be applied individually or in combination.

[0089] (First method)

[0090] In the first approach, multiple TCI states are envisioned to control the reception of at least one of the PDCCH and PDSCH (hereinafter also referred to as PDCCH / PDSCH). Alternatively, multiple TCI states can also be interpreted as multiple reference signals corresponding to different TCI states, or multiple reference signals corresponding to different QCLs.

[0091] The network (or base station) assigns multiple TCI states (or, QCL assumption) to the UE based on the demodulation reference signal (DMRS) for the PDCCH / PDSCH. For example, the base station can also assign reference signals corresponding to each TCI state to the UE (refer to...). Figure 2 The base station can also set multiple TCI states (or reference signals) to the UE through at least one (or any combination of) higher-layer signaling, MAC control information, and DCI.

[0092] Furthermore, base stations can also set multiple TCI states (or reference signals) for each specific unit (e.g., each CORESET). Figure 2 The diagram illustrates the configuration of three TCI states (or reference signals). For example, a base station can also use higher-layer signaling to configure a specific number (e.g., 64) of TCI states and use MAC control information to specify the three TCI states. Of course, the number of TCI states (or reference signals) that can be configured is not limited to this.

[0093] Here, the example shows the TRS (TRS#1-#3) set as reference signals corresponding to each TCI state, which are equivalent to the CSI-RS used for tracking. However, the reference signals to be set are not limited to this. Other CSI-RSs for different purposes (e.g., CSI-RS for L1-RSRP, or CSI-RS for mobility) can be set instead of the TRS. Alternatively, reference signals other than CSI-RS can be set instead of the TRS (e.g., QRS equivalent to the reference signal used for QCL detection).

[0094] Furthermore, for each reference signal (TRS#1-#3), other reference signals that have a QCL relationship with TRS#1-#3 can also be associated. Figure 2 The diagram illustrates the QCL type D relationship between TRS#1 and SSB#1, TRS#2 and SSB#2, and TRS#3 and CSI-RS#1. Information regarding the QCL relationships of each TRS with other reference signals can also be provided to the UE from the base station using higher-layer signaling, etc.

[0095] The UE considers multiple TCI states (or TRS#1-#3 corresponding to the TCI states) set by the base station to perform PDCCH / PDSCH detection. For example, the UE assumes that at least one of TRS#1-#3 has a DMRS of QCL with the PDCCH / PDSCH for reception processing.

[0096] In this case, the UE can also utilize multiple beams (e.g., multiple analog beams) to simultaneously control the reception of TRS#1-#3 based on the capabilities of the terminal. Furthermore, the UE can also consider other reference signals (e.g., at least one of SSB#1, SSB#2, and CSI-RS#1) that form the QCL with each TRS during the reception of TRS#1-#3.

[0097] In addition, the UE may also notify the base station in advance of information related to the number of TCI states supported by the terminal (e.g., the number of TCI states that can be received simultaneously) as UE capability information.

[0098] In this way, by setting multiple TCI states (or reference signals) and envisioning these multiple TCI states for PDCCH / PDSCH reception, high-speed TCI state switching can be achieved even when there are changes in TCI states. For example, even when switching from the first TCI state (TRS#1) to the second TCI state (TRS#2) for PDCCH / PDSCH transmission, reception can be performed by pre-visualizing multiple TCI states, thus eliminating the need for... Figure 1 The switching operation is shown in the diagram. This allows for high-speed switching of the channel's TCI state, QCL configuration, or beam.

[0099] Furthermore, the UE can also be designed to apply the same TCI state to the PDCCH and the PDSCH scheduled via the PDCCH, at least on a CORESET basis. For example, the UE can designate the PDSCH scheduled via the PDCCH to be in the same TCI state as the PDCCH when receiving the PDSCH. As a result, there is no need to switch TCI states during the reception of the PDCCH and PDSCH, thus simplifying UE operation.

[0100] (Second method)

[0101] In the second approach, for the reference signal set as the TCI state, one or more reference signals are set as sources, and the reception of the PDCCH / PDSCH is controlled using these source reference signals. The source reference signal can also be a candidate reference signal (QCL candidate reference signal) that has a QCL relationship with the reference signal of the TCI state.

[0102] The network (or base station) sets a specific TCI state (or QCL assumption) associated with a specific reference signal to the UE (reference) for the decryption reference signal (DMRS) of PDCCH / PDSCH. Figure 3 The base station can also set a specific TCI state (or reference signal) to the UE through at least one (or any combination of) higher-layer signaling, MAC control information, and DCI.

[0103] Furthermore, the base station can also set a reference signal corresponding to a specific TCI state on a per-unit basis (e.g., per CORESET). Figure 3 The diagram illustrates the case where a single reference signal (here, TRS#1) is set for the UE. For example, the base station can also use higher-layer signaling to set a specific number (e.g., 64) of TCI states and use MAC control information to specify one TCI state. Of course, the number of reference signals is not limited to this.

[0104] Here, the example of setting a TRS (TRS#1) corresponding to the CSI-RS used for tracking as a reference signal for each TCI state is shown. However, the reference signal to be set is not limited to this. Other CSI-RSs for different purposes (e.g., CSI-RS for L1-RSRP or CSI-RS for mobility) can also be set instead of TRS.

[0105] Alternatively, a reference signal other than CSI-RS can be set instead of TRS (e.g., a QRS equivalent to the reference signal used for QCL detection) (see [reference]). Figure 4 ). Figure 4 The example shown illustrates the scenario where QRS#1 is set for the UE. In the following explanation, TRS can also be interpreted as QRS.

[0106] Furthermore, for a given reference signal (TRS#1), candidate reference signals (QCL candidate reference signals) that have a QCL relationship with TRS#1 can be associated. These candidate reference signals can also be called source reference signals.

[0107] exist Figure 3 The diagram illustrates a case where at least one of SSB#1, SSB#2, and CSI-RS#1 is set as the reference signal for TRS#1, which is in the TCI state. The number and type of reference signals that become the source are not limited to this. Information about the source reference signals associated with TRS#1 can also be set to the UE from the base station using higher-layer signaling, etc.

[0108] If multiple reference signals are set to be the source of TRS#1, it can be assumed that at least one reference signal is in a QCL relationship with TRS#1. For example, if multiple reference signals that can be the source of TRS#1 are set, the UE decides to become a QCL reference signal with TRS#1.

[0109] As an example, the UE can also determine the source reference signal for QCL based on the received power and sequence of TRS#1. When the determination is based on the received power of TRS#1, the UE can also generate a transmit replica of SSB or CSI-RS and compare the received TRS#1 with the generated transmit replica to determine the appropriate reference signal. Furthermore, maximum likelihood detection (MLD) can be used in the comparison between the received TRS#1 and the generated transmit replica.

[0110] The UE can also assume that the DMRS of TRS#1 (or the determined reference signal) and PDCCH / PDSCH is QCL for reception processing.

[0111] In this case, the UE may also notify the base station in advance of information about the number of reference signals that the terminal can support as a source (e.g., the number of reference signals that can be calculated when it is determined that TRS#1 is a reference signal of QCL), as UE capability information.

[0112] The base station can also be configured such that, when multiple reference signals are set as the source of the TRS, the UE is not explicitly notified when the TCI state (QCL) is changed or updated in the beam selection of the PDCCH. For example, consider the case where TRS#1, SSB#1, or SSB#2, which is set as the TCI state, is set as the source (see [reference]). Figure 5 Additionally, SSB#1 and SSB#2 are listed here as examples; however, the source reference signal that can be set is not limited to these. For example, CSI-RS can also be set as the source reference signal, and other downlink reference signals (e.g., DMRS of PDCCH / PDSCH) can also be set as the source reference signal.

[0113] In this case, the UE determines that one of SSB#1 and SSB#2 is in a QCL relationship with TRS#1. The base station may also not notify the UE which source (SSB#1 or SSB#2) is in a QCL relationship with TRS#1. Even without explicit notification from the base station regarding the QCL relationship, the UE determines that one of SSB#1 and SSB#2 is in a QCL relationship with TRS#1 and proceeds with PDCCH reception (see [reference]). Figure 6 ).

[0114] Figure 6 An example of updating the QCL of the PDCCH is shown. Here, the case where the QCL of TRS#1 changes from SSB#1 to SSB#2 is shown. First, the base station sends a PDCCH that becomes the QCL with TRS#1. At this point, TRS#1 and SSB#1 become the QCL. Based on the reception result of TRS#1, the UE determines which of SSB#1 and SSB#2 is the QCL (here, SSB#1 is selected) to control the reception of the PDCCH.

[0115] Subsequently, the base station changes the QCL of TRS#1 from SSB#1 to SSB#2. At this time, the base station does not explicitly notify the UE of the QCL change. After the QCL change, the base station sends a PDCCH that becomes the QCL with TRS#1. At this point, TRS#1 and SSB#2 become the QCL. Based on the reception result of TRS#1, the UE determines which of SSB#1 and SSB#2 is the QCL (here, SSB#2 is selected) to control the reception of the PDCCH.

[0116] In this case, there is no need for explicit notification from the base station to the UE regarding QCL, thus reducing the beam selection delay of PDCCH.

[0117] In this way, multiple reference signals are set as the source for a reference signal (e.g., TRS or QRS) that is set to TCI state, and PDCCH / PDSCH reception is performed considering the QCL of at least one of these multiple reference signals. Therefore, even when there is a change in TCI state, high-speed switching of TCI state is possible. For example, even when switching from a first TCI state (QCL assumption corresponding to SSB#1) to a second TCI state (QCL assumption corresponding to SSB#2) during PDCCH / PDSCH transmission, reception can be performed by pre-assuming multiple TCI states, thereby eliminating the need for... Figure 1 The switching operation is shown. This allows for high-speed switching of the channel's TCI state, QCL configuration, or beam.

[0118] Furthermore, the UE can also be designed to apply the same TCI state to the PDCCH and the PDSCH scheduled via the PDCCH, at least on a CORESET basis. For example, the UE can designate the PDSCH scheduled via the PDCCH to be in the same TCI state as the PDCCH when receiving the PDSCH. As a result, there is no need to switch TCI states during the reception of the PDCCH and PDSCH, thus simplifying UE operation.

[0119] (Third method)

[0120] In the third approach, an appropriate receiving spatial domain filter is determined based on the reference signal set as the TCI state, and this receiving spatial domain filter is used to control the reception of the PDCCH / PDSCH. Additionally, the receiving spatial domain filter (Rxspatial domain filter) can also be called a spatial domain filter or a receiving beam.

[0121] The network (or base station) sets a specific TCI state (or QCL assumption) associated with a specific reference signal to the UE (reference) for the decryption reference signal (DMRS) of PDCCH / PDSCH. Figure 7 The base station can also set a specific TCI state (or reference signal) to the UE through at least one (or any combination of) higher-layer signaling, MAC control information, and DCI.

[0122] Furthermore, the base station can also set a reference signal corresponding to a specific TCI state on a per-unit basis (e.g., per CORESET). Figure 7 The diagram illustrates the case where one reference signal (QRS#1) is set for the UE. For example, the base station can also use higher-layer signaling to set a specific number (e.g., 64) of TCI states and use MAC control information to specify one TCI state. Of course, the number of reference signals is not limited to this. Furthermore, the base station can also set information related to the QRS (e.g., at least one of the time resources, frequency resources, period, and transmission type of the set QRS) to the UE using higher-layer signaling, etc.

[0123] Here, the QRS used in QCL detection is shown as a reference signal corresponding to each TCI state; however, the reference signal to be set is not limited to this. A TRS can be set instead of the QRS, or a CSI-RS for other purposes can be set (e.g., a CSI-RS for L1-RSRP, or a CSI-RS for mobility). Additionally, the QRS can also be called the QCLRS or the RS for QCL.

[0124] Alternatively, the structure can be configured such that the association with candidate reference signals (QCL candidate reference signals) that form a QCL relationship with the defined reference signal (QRS#1) is not specifically targeted. In this case, QRS itself is equivalent to the source of the reference signal in the TCI state.

[0125] When a QRS is set as a TCI state, the UE can also determine the appropriate receive spatial filter for receiving that QRS. For example, the UE can determine a specific receive spatial filter by using different receive spatial filters to receive QRSs that are repeatedly transmitted in a specific time domain. A specific receive spatial filter can also be the receive spatial filter with the highest received power for the received QRS.

[0126] The base station can also repeatedly transmit QRSs with the same transmit spatial domain filter in different OFDM symbols (e.g., N consecutive OFDM symbols in the time direction) (repetition on). The transmit spatial domain filter (Tx spatial domain filter) can also be called a spatial domain filter, DL spatial domain filter, or transmit beam. The UE envisions QRSs with the same transmit spatial domain filter being transmitted in different symbols, and performs beam scanning to determine the specific receive spatial domain filter. Specifically, a different receive spatial domain filter is applied to each symbol to receive the QRS, selecting the receive spatial domain filter with the highest received power.

[0127] In addition, the UE may also notify the base station in advance of information related to the number of symbols required to determine the receive spatial filter (e.g., the number of receive spatial filters supported by the UE) as UE capability information.

[0128] When the UE is configured with QRS, it can also be assumed that the QRS and the PDCCH / PDSCH assigned to the time domain (e.g., subsequent symbols) after the allocation time domain of the QRS are QCL, and reception processing is performed.

[0129] Figure 8 This diagram illustrates an example of PDCCH reception based on QRS. When the UE is configured with QRS from the base station, it performs reception processing within the QRS resources and determines the specific spatial filters to utilize during reception. Information related to the QRS resources can also be communicated to the UE in advance from the base station.

[0130] Here, the QRS with the same transmit spatial filter #1 applied is repeatedly transmitted four times (e.g., in four different symbols). The UE uses different receive spatial filters to receive the QRS and determines the specific receive spatial filter. The UE assumes that the PDCCH and QRS transmitted after this are QCL, and applies the specific receive spatial filter to receive the PDCCH (the PDCCH with transmit spatial filter #1 applied).

[0131] When the base station transmits PDCCH by switching the receive beam, it also transmits QRS by switching the transmit spatial filter in the QRS resource. Here, the case of transmitting QRS using transmit spatial filter #2 is shown. The UE receives the QRS that is repeatedly transmitted in the set QRS resource. Furthermore, the UE performs reception by switching the receive spatial filter used in reception, thereby determining the appropriate specific receive spatial filter for reception. The UE assumes that the PDCCH and QRS transmitted thereafter are QCL, and applies a specific receive spatial filter to receive the PDCCH (the PDCCH with transmit spatial filter #2 applied).

[0132] exist Figure 8 The diagram illustrates the case where QRS resources are set to common regardless of the number of transmit spatial filters applied in the QRS transmission. In other words, the UE receives QRS resources from the base station that have been configured with any one of the transmit spatial filters applied.

[0133] In this way, the PDCCH / PDSCH is received by applying a specific receiving spatial filter selected based on a reference signal (e.g., QRS) set to TCI state. Thus, even when the transmitting beam (transmitting spatial filter) is changed, the corresponding receiving beam (receiving spatial filter) can be switched at high speed.

[0134] Furthermore, the UE can also be designed to apply the same TCI state to the PDCCH and the PDSCH scheduled via the PDCCH, at least on a CORESET basis. For example, the UE can designate the PDSCH scheduled via the PDCCH to be in the same TCI state as the PDCCH when receiving the PDSCH. As a result, there is no need to switch TCI states during the reception of the PDCCH and PDSCH, thus simplifying UE operation.

[0135] <Multiple QRS resource settings>

[0136] exist Figure 8 The diagram illustrates a case where QRS resources are set to common regardless of the number of transmit spatial filters applied in QRS transmission; however, it is not limited to this. For example, different QRS resources can be set according to the transmit spatial filters applied in QRS transmission (see [reference]). Figure 9 ).

[0137] exist Figure 9The diagram illustrates the configuration of QRS resources #1-#3 corresponding to the transmit space fields #1-#3 applicable to QRS. QRS resources #1-#3 can also be resources partitioned using at least one of time multiplexing, frequency multiplexing, sequence multiplexing, and cyclic shift multiplexing. Information related to QRS resources #1-#3 can also be communicated to the UE from the base station.

[0138] exist Figure 9 The diagram shows the case where QRS resources #1-#3 are set in the same time domain (e.g., at least one of frequency multiplexing, sequence multiplexing, and cyclic shift multiplexing is applied). However, they can also be set in different time domains through time multiplexing.

[0139] exist Figure 9 First, the QRS with the transmission spatial filter #1 applied is repeatedly transmitted four times in QRS resource #1 (e.g., in four different symbols). On the other hand, the QRS is not transmitted in QRS resources #2 and #3. That is, the base station sets the transmission spatial filter #1 to be applied (enabled) and sets the transmission spatial filters #2 and #3 to be unapplication (disabled).

[0140] In QRS resources #1-#3, the UE attempts to receive QRS using different receive spatial filters and determines a specific receive spatial filter. Here, the UE receives QRS in QRS resource #1, therefore, it can determine that the base station applies transmit spatial filter #1. The UE assumes that the PDCCH and QRS transmitted after this are QCL, and applies a specific receive spatial filter to receive the PDCCH (the PDCCH with transmit spatial filter #1 applied).

[0141] When a base station transmits a PDCCH by switching its receive beam (e.g., applying transmit spatial filter #2), it also transmits a QRS in QRS resource #2 with transmit spatial filter #2 applied. When a UE receives a QRS in QRS resource #2, it can determine that the base station has applied transmit spatial filter #2. The UE assumes that the PDCCH and QRS transmitted subsequently are QCL, and applies a specific receive spatial filter to receive the PDCCH (the PDCCH with transmit spatial filter #2 applied).

[0142] In this way, by setting the QRS resources separately for each transmit spatial filter applied to the QRS, the UE can determine which transmit spatial filter the base station is applying.

[0143] In addition, the number of resources set for QRS (or the number of transmit spatial filters applied to QRS) can be limited to a specific number (see [reference]). Figure 10 ). Figure 10An example is shown where the number of QRS resources (or, transmit spatial filters applied to QRS) is set to two or less.

[0144] Alternatively, the structure can be configured such that the QRS resources used in the transmission of QRS are changed only if the QCL (or TCI state) of the PDCCH (or QRS) is changed. For example, in Figure 10 The diagram illustrates how the QRS resources for transmission change when the QCL is modified (e.g., when the transmit spatial filter applied to the PDCCH is changed).

[0145] In addition, Figure 10 The diagram illustrates the case where QRS is transmitted multiple times (here, 4 times), but it is not limited to this. For example, the UE could also devise a specific receive spatial filter for receiving QRS resources. In this case, the base station could also transmit QRS using at least one symbol in the QRS resource (see [reference]). Figure 11 A particular receive spatial filter can also be a receive spatial filter that has been applied in the past (or recently) (e.g., a receive spatial filter selected by receive beam scanning).

[0146] exist Figure 11 In this process, the UE applies specific receive spatial filters for QRS resources #1 and #2 to receive QRS data. Furthermore, the receive spatial filters applied to different QRS resources can be the same or different. Based on the detected QRS resource, the UE determines the transmit spatial filter applied to the QRS, assuming that the QRS and PDCCH are in a QCL (Quadrant-Clearer-Like) state, and then receives the PDCCH.

[0147] Therefore, it is possible to configure a structure that does not require multiple symbols to be used as QRS resources, thereby improving resource utilization efficiency.

[0148] (Change 1)

[0149] When QCL resources are configured, it is also conceivable that QCL resources may overlap with other channels (e.g., PDSCH). In this case, the UE can also perform either Operation 1 or Operation 2.

[0150] <Operation 1>

[0151] The UE can also perform rate matching or truncation of PDSCH if the QRS is actually transmitted.

[0152] PDSCH rate matching refers to controlling the number of encoded bits (coded bits) while considering the actual available radio resources. When the number of encoded bits is small compared to the number of bits that can be mapped to the actual available radio resources, at least a portion of the encoded bits can be repeated. When the number of encoded bits is large compared to the number of bits that can be mapped, a portion of the encoded bits can be deleted.

[0153] The PDSCH truncation process is designed to utilize the resources allocated to the PDSCH (or, disregarding the amount of unusable resources) for encoding. However, it can also mean not mapping encoded symbols to resources that are actually unusable (freeing up resources). On the receiving side, by setting the encoding symbols of the truncated resources not to be used for decoding, the performance degradation caused by truncation can be suppressed.

[0154] When processing PDSCH based on the premise that QRS are actually sent, it is appropriate to apply truncation if the possibility of missing actually sent QRS is considered.

[0155] <Operation 2>

[0156] The UE can also perform rate matching or truncation on PDSCH that duplicates QRS resources, regardless of whether QRS is actually transmitted. Additionally, rate mapping is suitable when processing PDSCH unrelated to QRS transmission.

[0157] (Change 2)

[0158] The UE can also apply the TCI state set in one CORESET to other CORESETs. For example, if the TCI state is not set for CORESET#X, the UE can also apply the TCI state (or QCL) set in another CORESET (e.g., CORESET#X-1) to CORESET#X.

[0159] Other CORESETs can also be CORESETs with smaller indices. For example, if the TCI state is not set in CORESET#1 or #2, the UE can also apply the QCL in CORESET#0 to CORESET#1 or #2.

[0160] In this way, by applying the TCI state (QCL concept) of a specific CORESET to other CORESETs, it becomes unnecessary to set the TCI state for each CORESET individually. Thus, the network (or base station) only needs to set the TCI state for at least one of multiple CORESETs (e.g., the CORESET with the smallest index), thereby reducing the TCI state setting operation.

[0161] (Change 3)

[0162] The UE can also be configured such that, when the QCL specified by the QRS is applied to the PDCCH, it is applied to the PDCCH after a specific period following the reception of the QRS. For example, the UE can also apply the QCL (or, the receive spatial filter) determined based on the QRS to the reception of the PDCCH after a specific period (T) following the reception of the QCL (see reference). Figure 12 ).

[0163] exist Figure 12 The diagram illustrates the case where the QCL is changed (or updated) from 1 to 2 via QRS. Even when the UE receives a QRS specifying a second QCL#2 (or transmits spatial filter #2), it assumes the previous QCL (here, QCL#1) for PDCCH reception until a specific period (T) has elapsed after receiving the QRS. Furthermore, the time domain of the QCL specified via QRS can also be set.

[0164] (Change 4)

[0165] The UE also considers using multiple Transmit / Receive Points (TRPs) for PDCCH / PDSCH reception. In this case, the TCI state (or reference signal) needs to be properly configured whether a single TRP or multiple TRPs are used. Additionally, TRP can also be interpreted as DMRS port group, panel, or codeword.

[0166] For example, such as Figure 4 As shown, when setting multiple TCI states (or multiple reference signals corresponding to each TCI state), all reference signals (e.g., TRS#1-#3) can be associated with each TRP (or DMRS port group, panel, codeword, PDSCH) for configuration. In other words, the same TRS#1-#3 can be set in each TRP.

[0167] Alternatively, the RS corresponding to the TCI state set for each CORESET can also be set separately for each TRP (or DMRS port group, panel, codeword, PDSCH). For example, TRS#1 (or SSB#1) can be set for TRP1 (or DMRS port group 1), and TRS#3 (or CSI-RS#1) can be set for TRP2 (or DMRS port group 2).

[0168] When multiple TRPs are applied, the UE can also consider all the set TCI states during PDCCH / PDSCH detection for reception processing. Alternatively, the UE can also consider combinations of set TCI states (e.g., combinations of QCL characteristics of different TRPs) for PDCCH / PDSCH detection.

[0169] (Wireless Communication System)

[0170] The structure of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of this disclosure.

[0171] Figure 13 This is a diagram illustrating an example of the schematic structure of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that uses LTE (Long Term Evolution) or 5G NR (5th generation mobile communication system New Radio) standardized by 3GPP (Third Generation Partnership Project) to achieve communication.

[0172] Furthermore, the wireless communication system 1 can also support dual connectivity between multiple RATs (Radio Access Technology) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0173] 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.

[0174] Wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (e.g., MN and SN are dual connectivity of NR base stations (gNB) (NR-NR dual connectivity (NN-DC: NR-NR DualConnectivity))).

[0175] The wireless communication system 1 may also include: a base station 11 forming a macro cell C1 with a relatively wide coverage area, and a base station 12 (12a-12c) configured within the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. User terminals 20 may also be located within at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the arrangement shown in the figure. Hereinafter, without distinguishing between base stations 11 and 12, they will be collectively referred to as base station 10.

[0176] User terminal 20 may also connect to at least one of multiple base stations 10. User terminal 20 may also utilize at least one of carrier aggregation using multiple component carriers (CC) and dual connectivity (DC).

[0177] Each CC can also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). Macro cell C1 can also be included in FR1, and small cell C2 can also be included in FR2. For example, FR1 can also be a frequency band below 6 GHz (sub-6 GHz), and FR2 can also be a frequency band above 24 GHz (above-24 GHz). Furthermore, the frequency bands and definitions of FR1 and FR2 are not limited to these; for example, FR1 can also correspond to a frequency band higher than FR2.

[0178] In addition, user terminal 20 can also communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0179] Multiple base stations 10 can also be connected via wired (e.g., fiber optic cable based on CPRI (Common Public Radio Interface), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, base station 11, which is equivalent to a host station, can also be called an IAB (Integrated Access Backhaul) donor, and base station 12, which is equivalent to a relay station, can also be called an IAB node.

[0180] Base station 10 can also be connected to core network 30 via other base stations 10 or directly. Core network 30 may include at least one of EPC (Evolved Packet Core), 5GCN (5G Core Network), NGC (Next Generation Core), etc.

[0181] User terminal 20 can also be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0182] In wireless communication system 1, wireless access methods based on Orthogonal Frequency Division Multiplexing (OFDM) can also be used. For example, in at least one of the downlink (DL) and uplink (UL), CP-OFDM (Cyclic Prefix OFDM), DFT-s-OFDM (Discrete Fourier Transform Spread OFDM), OFDMA (Orthogonal Frequency Division Multiple Access), SC-FDMA (Single Carrier Frequency Division Multiple Access), etc., can be used.

[0183] Wireless access methods can also be referred to as waveforms. In addition, in wireless communication system 1, other wireless access methods (e.g., other single-carrier transmission methods, other multi-carrier transmission methods) can also be applied in the wireless access methods of UL and DL.

[0184] In the wireless communication system 1, the downlink channel can also be a shared downlink channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), or a downlink control channel (Physical Downlink Control Channel (PDCCH)) shared by each user terminal 20.

[0185] In addition, in the wireless communication system 1, the uplink channel can also be an uplink shared channel (Physical Uplink Shared Channel (PUSCH)), an uplink control channel (Physical Uplink Control Channel (PUCCH)), or a random access channel (Physical Random Access Channel (PRACH)) shared by each user terminal 20.

[0186] User data, high-level control information, and SIBs (System Information Blocks) are transmitted via PDSCH. User data and high-level control information can also be transmitted via PUSCH. Furthermore, MIBs (Master Information Blocks) can be transmitted via PBCH.

[0187] Lower-layer control information can also be transmitted via PDCCH. This lower-layer control information may include, for example, downlink control information (DCI), which contains scheduling information for at least one of PDSCH and PUSCH.

[0188] Additionally, the DCI for scheduling PDSCH can also be called DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH can also be called UL authorization, UL DCI, etc. Furthermore, PDSCH can also be interpreted as DL data, and PUSCH can also be interpreted as UL data.

[0189] In PDCCH detection, control resource sets (CORESET) and search spaces can also be utilized. A CORESET corresponds to the resources used to search for DCIs. The search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor CORESETs associated with a specific search space based on search space settings.

[0190] One SS can also correspond to a PDCCH candidate that matches one or more aggregation levels. One or more search spaces can also be called a search space set. In addition, the terms "search space", "search space set", "search space setting", "search space set setting", "CORESET", and "CORESET setting" in this disclosure can be used interchangeably.

[0191] PUCCH can also be used to transmit Channel State Information (CSI), delivery confirmation information (e.g., HARQ-ACK, ACK / NACK, etc.), and scheduling requests (SR). PRACH can also be used to transmit random access preambles used to establish connections with the cell.

[0192] Additionally, in this disclosure, downlink, uplink, etc., may be described without the word "link". Furthermore, it may be described without "physical" at the beginning of various channels.

[0193] In wireless communication system 1, synchronization signals (SS) and downlink reference signals (DL-RS) can also be transmitted. In wireless communication system 1, the DL-RS can also transmit cell-specific reference signals (CRS), channel state information reference signals (CSI-RS), demodulation reference signals (DMRS), positioning reference signals (PRS), and phase tracking reference signals (PTRS).

[0194] Synchronization signals can be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) can also be called an SS / PBCH block, SSB (SS block), etc. Additionally, SS, SSB, etc., can also be called reference signals.

[0195] Furthermore, in wireless communication system 1, the uplink reference signal (UL-RS) can also transmit measurement reference signals (sounding reference signals (SRS)) and demodulation reference signals (DMRS). Additionally, DMRS can also be referred to as user terminal-specific reference signals (UE-specific reference signals).

[0196] (Base station)

[0197] Figure 14 This diagram illustrates an example of the structure of a base station according to one embodiment. The base station 10 includes a control unit 110, a transmit / receive unit 120, a transmit / receive antenna 130, and a transmission path interface (transmission line interface) 140. Alternatively, more than one of each of the control unit 110, transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140 may be included.

[0198] Furthermore, in this example, only the functional blocks of the characteristic parts of this embodiment are shown. The base station 10 can also be conceived to have other functional blocks required for wireless communication. Some of the processing of each unit described below can also be omitted.

[0199] The control unit 110 performs overall control of the base station 10. The control unit 110 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0200] The control unit 110 can also control signal generation and scheduling (e.g., resource allocation, mapping). The control unit 110 can also control transmission, reception, and measurement using the transmit / receive unit 120, transmit / receive antenna 130, and transmission path interface 140. The control unit 110 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmit / receive unit 120. The control unit 110 can also perform call processing (setting, releasing, etc.) of the communication channel, status management of the base station 10, and management of wireless resources.

[0201] The transmitting / receiving unit 120 may also include a baseband unit 121, an RF (Radio Frequency) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting / receiving unit 120 can be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0202] The transmitting and receiving unit 120 can be configured as a single integrated transmitting and receiving unit, or it can be configured as a transmitting unit and a receiving unit. The transmitting unit can also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit can also be configured as a receiving processing unit 1212, an RF unit 122, and a measurement unit 123.

[0203] The transmitting and receiving antenna 130 can be constructed from an antenna, such as an array antenna, as described based on common knowledge in the art to which this disclosure pertains.

[0204] The transmitting / receiving unit 120 can also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 can also receive the aforementioned uplink channel, uplink reference signal, etc.

[0205] The transmitting and receiving unit 120 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0206] The transmitting and receiving unit 120 (transmitting processing unit 1211) may, for example, perform PDCP (Packet Data Convergence Protocol) layer processing, RLC (Radio Link Control) layer processing (e.g., RLC retransmission control), MAC (Medium Access Control) layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 110, and generate a bit string to be transmitted.

[0207] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (as needed), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output the baseband signal.

[0208] The transmitting and receiving unit 120 (RF unit 122) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 130.

[0209] On the other hand, the transmitting and receiving unit 120 (RF unit 122) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 130.

[0210] The transmitting and receiving unit 120 (receiving and processing unit 1212) can also perform receiving and processing on the acquired baseband signal, including analog-to-digital conversion, Fast Fourier Transform (FFT), Inverse Discrete Fourier Transform (IDFT) (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 obtain user data.

[0211] The transmitting / receiving unit 120 (measurement unit 123) can also perform measurements related to the received signal. For example, the measurement unit 123 can also perform RRM (Radio Resource Management) measurements, CSI (Channel State Information) measurements, etc., based on the received signal. The measurement unit 123 can also measure received power (e.g., RSRP (Reference Signal Received Power)), received quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 110.

[0212] The transmission path interface 140 can also transmit and receive signals (backhaul signaling) between the device included in the core network 30 and other base stations 10, and can also acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0213] In addition, the transmitting unit and receiving unit of the base station 10 in this disclosure can also be configured by at least one of the transmitting / receiving unit 120, the transmitting / receiving antenna 130 and the transmission path interface 140.

[0214] Additionally, the transmit / receive unit 120 can also transmit information related to multiple reference signals associated with the status of one or more transmit configuration indicators (TCIs). Furthermore, the transmit / receive unit 120 can also envision quasi-co-addressing with at least one of the multiple reference signals to transmit downlink physical channels (e.g., at least one of PDCCH and PDSCH).

[0215] Furthermore, the transmitting and receiving unit 120 can also cover a specific time domain and repeatedly transmit a specific reference signal associated with the transmission setting indication (TCI) state using different transmission spatial filters.

[0216] Control unit 110 controls the setting of reference signals for one or more Transmission Setting Indication (TCI) states. Furthermore, control unit 110 controls the transmission of the downlink physical channel to achieve quasi-co-addressing with at least one of the multiple reference signals.

[0217] (User terminal)

[0218] Figure 15 This diagram illustrates an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Alternatively, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0219] Furthermore, in this example, only the functional blocks of the characteristic parts of this embodiment are shown. The user terminal 20 can also be conceived to have other functional blocks required for wireless communication. Some of the processing of each unit described below can also be omitted.

[0220] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be composed of a controller, control circuit, etc., which are described based on common knowledge in the art to which this disclosure pertains.

[0221] The control unit 210 can also control signal generation, mapping, etc. The control unit 210 can also control transmission, reception, measurement, etc., using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 can also generate data, control information, sequences, etc., to be transmitted as signals and forward them to the transmission / reception unit 220.

[0222] The transmitting / receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting / receiving unit 220 may be composed of transmitters / receivers, RF circuits, baseband circuits, filters, phase shifters, measurement circuits, transmitting / receiving circuits, etc., as described based on common knowledge in the art to which this disclosure pertains.

[0223] The transmitting and receiving unit 220 can be configured as a single integrated transmitting and receiving unit, or it can be composed of a transmitting unit and a receiving unit. The transmitting unit can also be composed of a transmitting processing unit 2211 and an RF unit 222. The receiving unit can also be composed of a receiving processing unit 2212, an RF unit 222, and a measurement unit 223.

[0224] The transmitting and receiving antenna 230 can be constructed from an antenna such as an array antenna, which is based on common knowledge in the art field to which this disclosure pertains.

[0225] The transmitting / receiving unit 220 can also transmit the downlink channel, synchronization signal, downlink reference signal, etc., as described above. The transmitting / receiving unit 220 can also receive the uplink channel, uplink reference signal, etc., as described above.

[0226] The transmitting and receiving unit 220 may also use digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), etc., to form at least one of the transmitting beam and the receiving beam.

[0227] The transmitting and receiving unit 220 (transmitting processing unit 2211) may, for example, perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control) on the data and control information obtained from the control unit 210, and generate the bit string to be transmitted.

[0228] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform transmission processing such as channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, and digital-to-analog conversion on the bit column to be transmitted, and output a baseband signal.

[0229] Furthermore, the application of DFT processing can be based on the transform precoding settings. For a specific channel (e.g., PUSCH), if transform precoding is active (enabled), the transmit / receive unit 220 (transmit processing unit 2211) can perform DFT processing as described above for transmitting the channel using the DFT-s-OFDM waveform. Otherwise, the transmit / receive unit 220 (transmit processing unit 2211) can perform the aforementioned transmit processing without performing DFT processing.

[0230] The transmitting and receiving unit 220 (RF unit 222) can also perform modulation, filtering, amplification, etc. on the baseband signal to the wireless frequency band, and transmit the wireless frequency band signal through the transmitting and receiving antenna 230.

[0231] On the other hand, the transmitting and receiving unit 220 (RF unit 222) can also amplify, filter, and demodulate the baseband signal for the wireless frequency band signal received by the transmitting and receiving antenna 230.

[0232] The transmitting and receiving unit 220 (receiving and processing unit 2212) can also perform receiving and processing on the acquired baseband signal, such as analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data.

[0233] The transmitting / receiving unit 220 (measurement unit 223) can also perform measurements related to the received signal. For example, the measurement unit 223 can also perform RRM measurements, CSI measurements, etc., based on the received signal. The measurement unit 223 can also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results can also be output to the control unit 210.

[0234] In addition, the transmitting unit and receiving unit of the user terminal 20 in this disclosure can also be configured by at least one of the transmitting / receiving unit 220, the transmitting / receiving antenna 230 and the transmission path interface 240.

[0235] Additionally, the transmit / receive unit 220 receives information related to multiple reference signals associated with one or more Transmission Configuration Indicator (TCI) states. Furthermore, the transmit / receive unit 220 may also envision quasi-co-addressing with at least one of the multiple reference signals to receive downlink physical channels (e.g., at least one PDCCH and PDSCH). Each of the multiple reference signals may also be associated with a different TCI state. The multiple reference signals may also be source reference signals associated with a specific reference signal set for a single TCI state.

[0236] Furthermore, the transmit / receive unit 220 can also cover a specific time domain and repeatedly receive a specific reference signal associated with the Transmission Setting Indication (TCI) state using different receive spatial filters. The transmit / receive unit 220 can also apply a specific receive spatial filter determined based on repeated reception of the specific reference signal to receive the downlink physical channel. Additionally, one of multiple transmit spatial filters can be applied for a specific reference signal transmitted in a pre-defined specific resource.

[0237] The control unit 210 can also determine the source reference signal that becomes quasi-co-located with the specific reference signal based on the reception result of the specific reference signal. In addition, the control unit 210 can also be conceived to apply the same TCI state to the downlink control channel and the downlink shared channel scheduled using the downlink control channel.

[0238] Alternatively, the control unit 210 can be conceived such that specific reference signals to which different transmit spatial filters are applied are allocated to different resources. Furthermore, the control unit 210 can also be conceived such that, in the event of a change in the quasi-co-address of a specific reference signal, the resource to which that specific reference signal is allocated changes.

[0239] (Hardware Structure)

[0240] Furthermore, the block diagrams used in the description of the above embodiments illustrate functional units. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Moreover, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented using a single device that is physically or logically combined, or it can be implemented by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. A functional block can also be implemented by combining one or more of the aforementioned devices with software.

[0241] Here, the functions include judgment, decision, determination, calculation, calculation, processing, export, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, choosing, establishing, comparison, assumption, expectation, regard as, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but are not limited to these. For example, a functional block (structural unit) that implements the sending function can also be called a transmitting unit, transmitter, etc. As described above, the implementation method is not particularly limited.

[0242] For example, in one embodiment of this disclosure, the base station, user terminal, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 16This diagram illustrates an example of the hardware structure of a base station and a user terminal according to one embodiment. The base station 10 and the user terminal 20 described above can also be physically configured as a computer device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0243] Furthermore, in this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware structure of base station 10 and user terminal 20 can be configured to include one or more of the apparatuses shown in the figures, or it can be configured not to include any of the apparatuses.

[0244] For example, only one processor 1001 is shown, but there may be multiple processors. Furthermore, processing can be performed by one processor, or simultaneously, sequentially, or by two or more processors using other methods. Additionally, processor 1001 can be mounted on more than one chip.

[0245] The functions of the base station 10 and the user terminal 20 are implemented, for example, by reading specific software (programs) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of reading out and writing data in the memory 1002 and the storage device 1003.

[0246] The processor 1001, for example, enables the operating system to operate and control the computer as a whole. The processor 1001 may also be configured as a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic devices, registers, etc. For example, at least a portion of the control unit 110 (210), the transmit / receive unit 120 (220), etc., described above may also be implemented by the processor 1001.

[0247] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operating in the processor 1001; similar implementations can be made for other functional blocks.

[0248] The memory 1002 may also be a computer-readable recording medium, such as at least one of ROM (Read-Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable Memory), RAM (Random Access Memory), or other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (main storage device), etc. The memory 1002 can store executable programs (program code), software modules, etc., for implementing the wireless communication method according to one embodiment of this disclosure.

[0249] Storage device 1003 may also be a computer-readable recording medium, such as at least one of a flexible disc, floppy disk, optical disk (e.g., CD-ROM), digital multifunction disk, Blu-ray disc, removable disk, hard disk, smart card, flash memory device (e.g., card, stick, keydrive), magnetic stripe, database, server, or other suitable storage medium. Storage device 1003 may also be referred to as an auxiliary storage device.

[0250] The communication device 1004 is hardware (transmitting and receiving device) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. To implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD), the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the aforementioned transmit / receive unit 120 (220) and transmit / receive antenna 130 (230) may also be implemented by the communication device 1004. The transmit / receive unit 120 (220) may also be physically or logically separated from the receive unit 120a (220a) and the receiver unit 120b (220b).

[0251] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED (light-emitting diode) lamp, etc.). Alternatively, input device 1005 and output device 1006 can also be an integrated structure (e.g., touch panel).

[0252] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communication of information. The bus 1007 can be a single bus or different buses can be used between the devices.

[0253] Furthermore, the base station 10 and the user terminal 20 can also be configured with hardware including microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), etc., and can be used to implement part or all of the functional blocks. For example, the processor 1001 can also be installed using at least one of these hardware components.

[0254] (Modified Example)

[0255] Furthermore, the terms described in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Additionally, a signal may also be a message. A reference signal may also be simply referred to as RS (Reference Signal), and may also be called a pilot, pilot signal, etc., depending on the applied standard. Furthermore, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0256] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) that constitutes the radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set.

[0257] Here, the parameter set can also refer to communication parameters applied in at least one of the transmission and reception of a signal or channel. For example, the parameter set can also represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, and specific windowing processing performed by the transmitter and receiver in the time domain.

[0258] In the time domain, a time slot can also be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). Furthermore, a time slot can also be a time unit based on a set of parameters.

[0259] A time slot can also contain multiple mini-slots. Each mini-slot can also consist of one or more symbols in the time domain. Furthermore, a mini-slot can also be called a sub-slot. A mini-slot can also consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can also be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using mini-slots can also be called PDSCH (PUSCH) mapping type B.

[0260] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also use their respective other names. Furthermore, the time units such as frames, subframes, time slots, mini-time slots, and symbols used in this disclosure can be used interchangeably.

[0261] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is to say, at least one of the subframe and TTI can be a subframe in the existing LTE (1ms), a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but a time slot, mini-time slot, etc.

[0262] Here, TTI refers, for example, to the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules radio resources (frequency bandwidth, transmit power, etc., available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0263] TTI can also be a unit of time for transmitting channel-coded data packets (transmission blocks), code blocks, codewords, etc., and can also be a unit of processing such as scheduling and link adaptation. In addition, when a TTI is given, the actual time interval (e.g., the number of symbols) mapped to the transmission block, code block, codeword, etc. can be shorter than the TTI.

[0264] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can also serve as the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit of the schedule can also be controlled.

[0265] A Time Interval (TTI) with a duration of 1 ms can 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 can 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 time slot, a sub-time slot, a time slot, etc.

[0266] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can also be interpreted as a TTI with a duration of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be interpreted as a TTI with a duration of less than a long TTI but more than 1 ms.

[0267] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers in an RB can also be determined based on the parameter set.

[0268] Furthermore, an RB can contain one or more symbols in the time domain, and can also be a time slot, a mini-time slot, a subframe, or the length of a TTI. A TTI, a subframe, etc., can also be composed of one or more resource blocks.

[0269] In addition, one or more RBs can also be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB Pair, RB Pair, etc.

[0270] Furthermore, a resource block can also consist of one or more resource elements (REs). For example, an RE can also be a radio resource area consisting of a subcarrier and a symbol.

[0271] The Bandwidth Part (BWP) (also known as partial bandwidth, etc.) can also represent a subset of consecutive common resource blocks (RBs) used for a certain parameter set in a carrier. Here, common RBs can also be determined by indexing RBs based on a common reference point of the carrier. PRBs can also be defined in a BWP and appended with numbers within that BWP.

[0272] A BWP can also include a UL BWP and a DL BWP. For a UE, one or more BWPs can be set within a single carrier.

[0273] At least one of the configured BWPs can be active, and the UE may not intend to transmit or receive specific signals / channels outside of the active BWPs. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can also be interpreted as "BWP."

[0274] Furthermore, the structures described above, such as radio frames, subframes, time slots, mini-time slots, and symbols, are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained within a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, and the number of symbols in a TTI, symbol length, and cyclic prefix (CP) length can be varied in many ways.

[0275] Furthermore, the information, parameters, etc., described in this disclosure can be represented by absolute values, relative values ​​with respect to a specific value, or other corresponding information. For example, wireless resources can also be indicated by a specific index.

[0276] In this disclosure, the names used for parameters, etc., are not limiting names in any respect. Furthermore, the mathematical formulas, etc., using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH (Physical Uplink Control Channel)), PDCCH (Physical Downlink Control Channel) etc.) and information elements can be identified by any suitable name; therefore, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0277] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be mentioned throughout the above description, can also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0278] Furthermore, information and signals can be output to at least one of the following: from a higher level (upper layer) to a lower level (lower layer), and from a lower level to a higher level. Information and signals can also be input and output via multiple network nodes.

[0279] Input and output information and signals can be stored in a specific location (such as memory) or managed using management tables. Input and output information and signals can be overwritten, updated, or appended. Output information and signals can also be deleted. Input information and signals can also be sent to other devices.

[0280] The notification of information is not limited to the methods / implementations described in this disclosure, and may also be carried out by other methods. For example, the notification of information in this disclosure may also be implemented through physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or combinations thereof.

[0281] In addition, physical layer signaling can also be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. Furthermore, RRC signaling can also be referred to as RRC messages, such as RRC connection setup messages, RRC connection reconfiguration messages, etc. Additionally, MAC signaling can also be notified using, for example, MAC control elements (MACCEs).

[0282] Furthermore, notification of specific information (e.g., a notification that “is X”) is not limited to explicit notification, but can also be implicit (e.g., by not providing that specific information, or by providing other information).

[0283] The determination can be made by a value represented by a single bit (0 or 1), by a true or false value (boolean), or by a numerical comparison (e.g., a comparison with a specific value).

[0284] Whether it is called software, firmware, middleware, microcode, hardware description language, or any other name, software should be broadly interpreted as instructions, instruction sets, code, code segments, program code, program, subprogram, software module, application, software application, software package, routine, subroutine, object, executable file, execution thread, process, function, etc.

[0285] Furthermore, software, instructions, and information can also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0286] The terms “system” and “network” as used in this disclosure are used interchangeably. “Network” may also mean devices included in a network (e.g., base stations).

[0287] In this disclosure, the terms "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL)", "TCI state (transmission configuration indication state)", "spatial relation", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", and "panel" are used interchangeably.

[0288] In this disclosure, the terms "base station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. There are also instances where the terms macro cell, small cell, femtocell, and picocell are used to refer to a base station.

[0289] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can provide communication services through a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0290] In this disclosure, the terms “Mobile Station (MS),” “user terminal,” “user equipment (UE),” and “terminal” are used interchangeably.

[0291] In some cases, a mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client, or several other appropriate terms.

[0292] At least one of the base station and the mobile station can also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. This mobile body can be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station can also be an IoT (Internet of Things) device such as a sensor.

[0293] Furthermore, the base station in this disclosure can also be interpreted as a user terminal. For example, various methods / implementations of this disclosure can be applied to structures that replace communication between the base station and the user terminal with communication between multiple user terminals (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, it can also be configured such that the user terminal 20 has the functions of the base station 10 described above. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to inter-terminal communication (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be interpreted as side channel.

[0294] Similarly, the user terminal in this disclosure can also be interpreted as a base station. In this case, it can also be configured such that the base station 10 has the functions of the user terminal 20 described above.

[0295] In this disclosure, actions posited as being performed by a base station may sometimes be performed by its upper node, depending on the circumstances. Clearly, in a network comprising one or more network nodes having a base station, various actions performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (e.g., considering an MME (Mobility Management Entity), an S-GW (Serving Gateway), etc., but not limited to these), or combinations thereof.

[0296] The various methods / implementations described in this disclosure can be used individually, in combination, or switched as needed during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of the various methods / implementations described in this disclosure can be rearranged as long as they do not contradict each other. For example, with respect to the methods described in this disclosure, the illustrated order is used to indicate various steps, but the order in which they are indicated is not limited.

[0297] The various methods / implementations described in this disclosure can also be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (Future Generation Radio Access), GSM (Global System for Mobile Communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE The system is covered by 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), systems utilizing other appropriate wireless communication methods, and next-generation systems derived from them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A, or a combination with 5G, etc.) for application.

[0298] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise specified. In other words, the word "based on" means both "based on only" and "based on at least".

[0299] Any reference to an element using the terms "first," "second," etc., as used in this disclosure does not comprehensively limit the quantity or order of these elements. These terms may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, references to the first and second elements do not imply that only two elements are permitted, or that the first element must take precedence over the second element in some form.

[0300] As used in this disclosure, the term "determining" can encompass a variety of actions in some cases. For example, "determining" can also be considered as making a "determination" regarding judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0301] In addition, "judgment (decision)" can also be regarded as the situation of making "judgment (decision)" on receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0302] Furthermore, "judgment (decision)" can also be seen as making "judgments (decisions)" regarding resolving, selecting, choosing, establishing, and comparing. In other words, "judgment (decision)" can also be seen as making "judgments (decisions)" regarding certain actions.

[0303] In addition, "judgment (decision)" can also be interpreted as "assuming", "expecting", "considering", etc.

[0304] As used in this disclosure, the terms "connected," "coupled," or all variations thereof, mean any direct or indirect connection or combination between two or more elements, and can include cases where there is one or more intermediate elements between two mutually "connected" or "coupled" elements. The combination or connection between elements can be physical, logical, or a combination of these. For example, "connected" can also be interpreted as "access."

[0305] In this disclosure, when connecting two elements, it is possible to consider using more than one wire, cable, printed electrical connection, etc., and as several non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, to "connect" or "combine" them with each other.

[0306] In this disclosure, the term "A is different from B" can also mean "A and B are different from each other". Additionally, the term can also mean "A and B are different from C respectively". Terms such as "separate" and "combined" can also be interpreted as "different".

[0307] In this disclosure, the terms “include,” “including,” and variations thereof, as well as the term “comprising,” mean inclusiveness. Furthermore, the term “or” as used in this disclosure does not mean XOR.

[0308] In this disclosure, for example, in cases where articles are added through translation, such as a, an, and the in English, the disclosure may also include cases where the noun following these articles is in a plural form.

[0309] The inventions disclosed herein have been described in detail above. However, it will be apparent to those skilled in the art that the inventions are not limited to the embodiments described herein. The inventions disclosed herein can be implemented as modifications and variations without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description in this disclosure is for illustrative purposes only and is not intended to limit the inventions disclosed herein in any way.

Claims

1. A terminal, comprising: The receiving unit receives a Media Access Control (MAC) CE, wherein the MAC CE specifies two or more TCI states within a plurality of Transmit Configuration Indication (TCI) states set for a Control Resource Set (CORESET) via higher-layer signaling; and The control unit, in receiving downlink control information (DCI) on the physical downlink control channel (PDCCH), uses two or more TCI states, wherein the DCI schedules the physical downlink shared channel (PDSCH). When the DCI indicates two TCI states, the control unit will use the two TCI states indicated by the DCI for receiving the PDSCH. If the DCI does not indicate any TCI state, the control unit will use the two or more TCI states used for receiving the DCI for receiving the PDSCH.

2. The terminal as described in claim 1, wherein, If the higher-layer signaling does not set the TCI state for the CORESET, the control unit will be used to set the TCI state of other CORESETs for the CORESET.

3. A wireless communication method for a terminal, comprising: The steps of receiving a Media Access Control (MAC) control element (CE), wherein the MAC CE specifies two or more TCI states within a plurality of transmit setting indication (TCI) states set for a control resource set (CORESET) via higher-layer signaling; and The step of using two or more TCI states in the reception of downlink control information (DCI) on the physical downlink control channel (PDCCH), wherein the DCI schedules the physical downlink shared channel (PDSCH). When the DCI indicates two TCI states, the terminal will use the two TCI states indicated by the DCI for receiving the PDSCH. If the DCI does not indicate any TCI state, the terminal will use the two or more TCI states used for receiving the DCI for receiving the PDSCH.

4. A base station, comprising: A transmitting unit transmits a Media Access Control (MAC) CE, wherein the MAC CE specifies two or more TCI states within a plurality of Transmit Configuration Indication (TCI) states set by higher-layer signaling for a Control Resource Set (CORESET); and The control unit uses two or more TCI states in the transmission of downlink control information (DCI) on the physical downlink control channel (PDCCH), wherein the DCI schedules the physical downlink shared channel (PDSCH). When the DCI indicates two TCI states, these two TCI states are used for receiving the PDSCH. If the DCI does not indicate any TCI state, the two or more TCI states are used for receiving the PDSCH.

5. A system having a terminal and a base station, wherein, The terminal has: The receiving unit receives a Media Access Control (MAC) CE, wherein the MAC CE specifies two or more TCI states within a plurality of transmit setting indication (TCI) states set for a control resource set (CORESET) via higher-layer signaling. as well as The control unit, in receiving downlink control information (DCI) on the physical downlink control channel (PDCCH), uses two or more TCI states, wherein the DCI schedules the physical downlink shared channel (PDSCH). When the DCI indicates two TCI states, the control unit uses these two TCI states for receiving the PDSCH. If the DCI does not indicate any TCI state, the control unit uses two or more TCI states for receiving the PDSCH. The base station has: The transmitting unit transmits the MAC CE and the DCI.

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