JPWO2020053977A1 - User terminal and wireless communication method - Google Patents

Abstract

The user terminal according to one aspect of the present disclosure includes a receiving unit that receives trigger information that triggers beam measurement of an aperiodic channel state information reference signal (A-CSI-RS), and the corresponding receiver. It is characterized by having a control unit that controls the beam measurement of the A-CSI-RS based on whether or not the TCI (Transmission Configuration Indication state) state of the A-CSI-RS is activated. According to one aspect of the present disclosure, a beam report can be reported with low delay.

Description

The present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system.

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of further high-speed data rate and low delay (Non-Patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel.8, 9).

Successor system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE (Also called Rel.15 or later) is also being considered.

In an existing LTE system (for example, LTE Rel. 8-14), a user terminal (UE: User Equipment) periodically and / or aperiodically refers to a base station with Channel State Information (CSI). ) Is sent. The UE transmits the CSI using the uplink control channel (PUCCH: Physical Uplink Control Channel) and / or the uplink shared channel (PUSCH: Physical Uplink Shared Channel).

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

Beam management (BM) methods have been studied in future wireless communication systems (eg, NR). In the beam management, beam selection based on a beam report transmitted by the UE to a base station is being considered.

However, based on existing methods, dynamic beam reporting can require very large delays. In this case, a decrease in communication throughput becomes a problem.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of reporting a beam report with low delay.

The user terminal according to one aspect of the present disclosure includes a receiving unit that receives trigger information that triggers beam measurement of an aperiodic channel state information reference signal (A-CSI-RS), and the corresponding receiver. It is characterized by having a control unit that controls the beam measurement of the A-CSI-RS based on whether or not the TCI (Transmission Configuration Indication state) state of the A-CSI-RS is activated.

According to one aspect of the present disclosure, a beam report can be reported with low delay.

FIG. 1 is a diagram showing an example of control of A-CSI-RS measurement according to the first embodiment. 2A and 2B are diagrams showing an example of information for activating the TCI state of A-CSI-RS according to the first embodiment. FIG. 3 is a diagram showing another example of information for activating the TCI state of A-CSI-RS according to the first embodiment. 4A and 4B are diagrams showing an example of activation of the TCI state of A-CSI-RS according to the second embodiment. FIG. 5 is a diagram showing an example of activation of the TCI state of the panel according to the third embodiment. 6A-6F is a diagram showing an example of the antenna configuration of the UE. FIG. 7 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 8 is a diagram showing an example of the overall configuration of the base station according to the embodiment. FIG. 9 is a diagram showing an example of the functional configuration of the base station according to the embodiment. FIG. 10 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment. FIG. 11 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

(CSI)
In the NR, the UE measures the channel state using a predetermined reference signal (or a resource for the reference signal), and feeds back (reports) channel state information (CSI) to the base station.

The UE is used for channel state information reference signal (CSI-RS), synchronization signal / broadcast channel (SS / PBCH: Synchronization Signal / Physical Broadcast Channel) block, synchronization signal (SS: synchronization signal), and demodulation. The channel state may be measured by using a reference signal (DMRS: DeModulation Reference Signal) or the like.

The CSI-RS resource may include at least one of Non Zero Power (NZP) CSI-RS and CSI-IM (Interference Management). The SS / PBCH block is a block containing a synchronization signal (eg, Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS)) and PBCH (and corresponding DMRS), and is an SS block (for example, a primary synchronization signal (PSS)). It may be called SSB) or the like.

The CSI is a channel quality indicator (CQI: Channel Quality Indicator), a precoding matrix indicator (PMI: Precoding Matrix Indicator), a CSI-RS resource indicator (CRI: CSI-RS Resource Indicator), and an SS / PBCH block resource indicator (CRI: CSI-RS Resource Indicator). SSBRI: SS / PBCH Block Indicator), Layer Indicator (LI: Layer Indicator), Rank Indicator (RI: Rank Indicator), L1-RSRP (Layer 1 Reference Signal Received Power), L1- At least one such as RSRQ (Reference Signal Received Quality), L1-SINR (Signal to Interference plus Noise Ratio), and L1-SNR (Signal to Noise Ratio) may be included.

The CSI may have multiple parts. CSI part 1 may include information with a relatively small number of bits (eg, RI). The CSI part 2 may include information having a relatively large number of bits (for example, CQI), such as information determined based on the CSI part 1.

CSI feedback methods include periodic CSI (P-CSI: Periodic CSI) reports, aperiodic CSI (A-CSI: Aperiodic CSI) reports, and semi-persistent CSI (SP-CSI: Semi-Persistent CSI). ) Reports are being considered.

The UE may be notified of CSI measurement configuration information (eg, the RRC information element "CSI-MeasConfig") using higher layer signaling, physical layer signaling, or a combination thereof. The CSI measurement setting information may be set using, for example, the RRC information element "CSI-MeasConfig".

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

For MAC signaling, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like may be used. Broadcast information includes, for example, a master information block (MIB: Master Information Block), a system information block (SIB: System Information Block), a minimum system information (RMSI: Remaining Minimum System Information), and other system information (OSI: Other). System Information) and so on.

The physical layer signaling may be, for example, downlink control information (DCI).

The CSI measurement setting information may include CSI resource setting information (RRC information element "CSI-ResourceConfig"), CSI report setting information (RRC information element "CSI-ReportConfig"), and the like.

The CSI resource setting information may include information for identifying the resource to be measured (for example, CSI-RS resource set ID, SSB resource set ID, etc.).

CSI report setting information includes report setting ID (CSI-ReportConfigId), report type (for example, P-CSI report, A-CSI report, SP-CSI report on PUCCH, SP-CSI report on PUSCH, etc.), and reporting cycle. (ReportPeriodicity), offset (ReportSlotOffset), information on which reference signal (or resource) to report the measured CSI (CSI-ResourceConfigId), and the like may be included.

SP-CSI reports using PUCCH (PUCCH-based SP-CSI reports) may be activated by MAC CE. SP-CSI reports using PUSCH (PUSCH-based SP-CSI reports), A-CSI reports using PUSCH or PUCCH, etc. may be activated (or triggered) by DCI.

For example, the trigger state may be specified by the CSI request field included in the DCI. The trigger state may be set by higher layer signaling (eg, RRC signaling). The list of trigger states for A-CSI reporting may be set in the RRC information element "CSI-AperiodicTriggerStateList", and the list of trigger states for SP-CSI reporting may be set in the RRC information element "CSI-SemiPersistentOnPUSCH-TriggerStateList". It may be set. Each trigger state may be associated with one or more report setting IDs (CSI-ReportConfigId), CSI resource setting information, and the like.

The CSI-RS measured for A-CSI reporting may be referred to as A-CSI-RS (Aperiodic CSI-RS). In the A-CSI report, the DCI is used to simultaneously trigger the CSI-RS measurement and the A-CSI report, so that the CSI report can be dynamically triggered while efficiently using the RS resource and the upstream channel resource.

(Beam management)
By the way, in Rel-15 NR, a method of beam management (BM: Beam Management) has been studied so far. In the beam management, it is considered to select a beam based on the L1-RSRP reported by the UE.

Changing (switching) the beam of a signal or channel corresponds to changing the TCI (Transmission Configuration Indication state) state of the signal or channel. The beams may be read as TCI states, pseudo-collocations (QCL: Quasi-Co-Location), and the like.

The TCI state (and / or QCL information) is, for example, a target channel (or a reference signal (RS) for the channel) and another signal (for example, another downlink reference signal (DL-RS:)). It may be information about QCL with Downlink Reference Signal)), for example, at least one of information about DL-RS related to QCL (DL-RS related information) and information indicating QCL type (QCL type information). It may be included.

The beam selected by beam selection may be a transmission beam (Tx beam) or a reception beam (Rx beam). Further, the beam selected by the beam selection may be the beam of the UE or the beam of the base station.

The UE may report (transmit) the measurement result for beam management using PUCCH or PUSCH. The measurement result may be, for example, a CSI containing at least one such as L1-RSRP, L1-RSRQ, L1-SINR, and L1-SNR. Further, the measurement result may be referred to as a beam measurement, a beam measurement result, a beam report, a beam measurement report, or the like.

CSI measurements for beam reporting may include interference measurements. The UE may use the resources for CSI measurement to measure channel quality, interference, etc. and derive a beam report. The resource for CSI measurement may be at least one such as an SS / PBCH block resource, a CSI-RS resource, and other reference signal resources. The setting information of the CSI measurement report may be set in the UE using higher layer signaling.

The beam report may include the results of at least one of the channel quality measurements and the interference measurements. The result of the channel quality measurement may include, for example, L1-RSRP. The result of the interference measurement may include L1-SINR, L1-SNR, L1-RSRQ, other indicators related to interference (for example, any index other than L1-RSRP) and the like.

The resource for CSI measurement for beam management may be referred to as a resource for beam measurement. Further, the signal / channel to be measured by CSI may be referred to as a beam measurement signal. Further, the CSI measurement / report may be read as at least one of measurement / report for beam management, beam measurement / report, wireless link quality measurement / report, and the like.

The CSI measurement setting information (eg, CSI-MeasConfig or CSI-ResourceConfig) is one or more non-zero power (NZP) CSI-RS resource sets (NZP-CSI-RS-ResourceSet) for CSI measurement. ), One or more zero power (ZP) CSI-RS resource sets (ZP-CSI-RS-ResourceSet) (or CSI-IM (Interference Management) resource set (CSI-IM-ResourceSet)) and one or more SS It may contain information such as / PBCH block resource set (CSI-SSB-ResourceSet).

The information of each resource set may include information about repetition in the resources in the resource set. Information about the iteration may indicate, for example,'on' or'off'. Note that'on'may be expressed as'enabled or valid', and'off'may be expressed as'disabled or invalid'.

For example, for a resource set with a repeat set to'on', the UE may assume that the resources in that resource set were transmitted using the same downlink spatial domain transmission filter. good. In this case, the UE may assume that the resources in the resource set were transmitted using the same beam (eg, from the same base station using the same beam).

For a resource set with iterations set to'off', the UE should not (or should not) assume that the resources in that resource set were sent using the same downlink spatial domain outbound filter. It may be controlled. In this case, the UE may assume that the resources in the resource set are not transmitted using the same beam (transmitted using different beams). That is, the UE may assume that the base station is performing beam sweeping for a resource set for which repetition is set to'off'.

The beam report may include multiple measurement results. For example, a UE for which group-based beam reporting is enabled by a higher layer parameter (eg, RRC parameter "groupBasedBeamReporting") may have multiple beam measurement resource IDs (eg, SSBRI, CRI) in the beam report for each report setting. ) And a plurality of measurement results (for example, L1-RSRP) corresponding to these may be included.

Further, a UE in which one or more report target RS resources are set by the upper layer parameter (for example, RRC parameter “nrofReportedRS”) has one or more beam measurement resource IDs in the beam report for each report setting. , One or more measurement results (eg, L1-RSRP) corresponding to these may be included.

By the way, the period from DCI to A-CSI-RS indicated by the DCI may be specified in relation to the trigger state described above. For example, the UE determines the CSI-RS resource set ID corresponding to the CSI-RS resource set to be measured based on the trigger state. This CSI-RS resource set ID may be associated with an aperiodic triggering offset.

The aperiodic triggering offset may mean the offset between the slot containing the DCI that triggers the resource set of A-CSI-RS and the slot to which the resource set is transmitted. As the aperiodic triggering offset, for example, a value of 0 or more and 4 or less may be set, or a value larger than 4 may be set. The aperiodic triggering offset information may correspond to the RRC parameter "aperiodicTriggeringOffset".

It is also being studied to define UE capability for beam switching timing. The UE capability may be referred to as A-CSI-RS beam switching timing, simply beam switching timing, or the like.

The beam switching timing may be defined as the minimum time between the DCI that triggers the measurement of A-CSI-RS (and the report of A-CSI) and the A-CSI-RS. The beam switching timing may indicate the time from the last symbol that received the DCI to the first symbol of the A-CSI-RS triggered by the DCI.

The beam switching timing may be applied to at least one of a first frequency band (FR2: Frequency Range 2) and a second frequency band (FR2: Frequency Range 2). For example, FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these.

The beam switching timing may take a different value for each subcarrier interval (for example, 60 kHz, 120 kHz).

The beam switching timing may be represented by the number of symbols, and may take values such as 14, 28, 48, 224, 336 symbols. The relatively large value of 336 symbols was considered in the case where the UE is equipped with a multi-panel, taking into account the time it takes to power on the panel receiving the A-CSI-RS from off to on. The panel of the unactivated beam may be powered off by the UE, which is the case when the panel is powered off.

The UE may use the A-CSI-RS for CSI acquisition on the assumption that there is no beam switching even when the aperiodic triggering offset is shorter than the beam switching timing. However, in this case, it is difficult to use the A-CSI-RS for beam reporting.

Therefore, dynamic beam reports using A-CSI-RS require very large delays (eg, 336 symbols) based on existing methods and may not be able to perform low delays. In this case, a decrease in communication throughput becomes a problem.

Therefore, the present inventors have conceived a method for reporting a beam report with low delay. In one aspect of the disclosure, the UE can pre-activate the beam of A-CSI-RS (TCI state). According to this configuration, instead of triggering the A-CSI-RS suddenly, the TCI state can trigger the active A-CSI-RS, and the A-CSI-RS can be triggered without the time required to power on the panel. Measurement becomes possible.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication methods according to each embodiment may be applied individually or in combination.

Hereinafter, the "aperiodic triggering offset" of the present disclosure is the time from the receipt of the DCI to the A-CSI-RS resource triggered by the DCI (eg, triggered by the DCI from the last symbol of the DCI). The time to the first symbol of A-CSI-RS). The aperiodic triggering offset may be expressed in predetermined time units (eg, number of symbols, number of slots, microseconds, etc.).

Also, in the present disclosure, activating a TCI state for a given resource may be read interchangeably with activating a given resource. Further, when activating the TCI state, if the power of the panel corresponding to the TCI state is off, the UE may assume that the power of the panel is turned on.

Further, the "beam measurement" in the present disclosure may be read as the calculation, measurement, or the like of any one of L1-RSRP, L1-SINR, L1-SNR, L1-RSRQ, and the like, or a combination thereof.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the UE may activate the TCI status for A-CSI-RS based on a predetermined signaling explicitly notified. For example, the predetermined signaling may be MAC signaling (eg, MAC CE) or physical layer signaling (eg, DCI). Hereinafter, the description will be made on the assumption that the predetermined signaling is MAC CE, but MAC CE may be read as other signaling.

When the UE triggers A-CSI-RS by the detected DCI, the UE may assume at least one of the following for the measurement of A-CSI-RS in the activated (active) TCI state. :
-If the aperiodic triggering offset is equal to or greater than the first threshold value, beam measurement based on the A-CSI-RS is performed.
-If the aperiodic triggering offset is less than the first threshold value, beam measurement based on the A-CSI-RS cannot be performed (or is not performed).

When the UE triggers A-CSI-RS by the detected DCI, the UE may assume at least one of the following for the measurement of A-CSI-RS in the inactive (deactive) TCI state. good:
-If the aperiodic triggering offset is equal to or greater than the second threshold value, beam measurement based on the A-CSI-RS is performed.
-If the aperiodic triggering offset is less than the second threshold, beam measurement based on the A-CSI-RS cannot be performed (or is not performed).

In the present disclosure, "cannot calculate L1-RSRP" may be read as "calculate L1-RSRP assuming a predetermined TCI state (QCL)". The "predetermined TCI state (QCL)" may be referred to as the default TCI state (QCL).

Here, "assuming a predetermined TCI state (QCL)" may mean, for example, "assuming DCI (PDCCH) and QCL type D". The fact that one channel / reference signal and another channel / reference signal have a QCL type D relationship may mean that it can be assumed that the spatial reception parameters for these are the same.

The first threshold value and the second threshold value may be defined as UE capabilities, respectively, or may be predetermined by specifications. The UE may transmit UE capability information for at least one of these thresholds to the base station. The first threshold value is preferably less than the second threshold value, but may be greater than or equal to the second threshold value.

FIG. 1 is a diagram showing an example of control of A-CSI-RS measurement according to the first embodiment. In this example, the first threshold value is less than the second threshold value. Further, in this example, the case where the aperiodic triggering offset is equal to or more than the first threshold value and less than the second threshold value is shown.

When the TCI state of the A-CSI-RS resource shown in FIG. 1 is activated, the UE may apply (implement) beam measurement based on the A-CSI-RS resource.

For example, the TCI state ID (TCI state ID) associated with the A-CSI-RS resource is up to # 1- # 8, of which # 1, # 2, # 4 and # 7 are activated and If the DCI directs the measurement of an A-CSI-RS resource for at least one of the TCI state IDs = # 1, # 2, # 4 and # 7, the UE will be beamed based on that A-CSI-RS resource. Measurements may be made.

If the TCI state of the A-CSI-RS resource shown in FIG. 1 has not been activated, it may be assumed that the UE does not apply (implement) beam measurements based on the A-CSI-RS resource.

Note that if the aperiodic triggering offset is less than the first threshold, the UE cannot be applied for beam measurements based on DCI-triggered A-CSI-RS, as shown. It may be assumed that the beam measurement based on the triggered A-CSI-RS is performed by assuming that the A-CSI-RS has a relationship between the DCI and the QCL type D.

Also, if the aperiodic triggering offset is greater than or equal to the second threshold, the UE is applicable to any A-CSI-RS based beam measurement (eg, powered on) as shown. It may be assumed that the A-CSI-RS can be measured by turning on the power and using the panel even if the panel is not used.

As described above, the first threshold value is called a beam switching timing that does not include the time required for activating the TCI state (for example, the time for turning on the power of the panel), the beam switching timing for the active TCI state, and the like. May be good. The first threshold value may simply represent the time required for beam switching.

Further, the second threshold value may be referred to as a beam switching timing including the time required for activation of the TCI state, a beam switching timing for the deactive TCI state, and the like.

Of the beam switching timings, a value equal to or less than a predetermined value (for example, 56 symbols) may be defined as the first threshold value, and other values may be defined as the second threshold value. For example, the first threshold value may be a value such as 14, 28, 48 symbols, and the second threshold value may be a value such as 224, 336 symbols.

The MAC CE that activates the TCI state of A-CSI-RS may include a bitmap to specify the TCI state to activate. 2A and 2B are diagrams showing an example of information for activating the TCI state of A-CSI-RS according to the first embodiment.

The TCI state of the A-CSI-RS to be activated is the TCI state ID (Identifier), CSI-RS resource set ID, CSI resource set by the upper layer signaling (for example, RRC information element "TCI-State"). Setting information (RRC information element "CSI-ResourceConfig") ID (RRC parameter "CSI-ResourceConfigId"), CSI-RS resource ID (for example, RRC parameter "NZP-CSI-RS-ResourceId"), CSI resource setting It may be specified by at least one such as the entry number of the CSI-RS resource set list (csi-RS-ResourceSetList) included in the information.

Hereinafter, the case where the activation / deactivation of the TCI state is controlled by using the TCI state ID will be described, but the control is not limited to this, and the control may be performed based on the other IDs described above.

FIG. 2A is a diagram showing an example of controlling activation / deactivation of one TCI state with one bit. Each bit of the 8-bit bitmap shown corresponds to TCI states # 1- # 8. The TCI state set in the UE may not be a serial number as shown in FIG. 2A. In this case, the TCI states # 1 to # 8 specified by the MAC CE may be read as the TCI state IDs set in the UE arranged in ascending or descending order.

Upon receiving the MAC CE containing the bitmap (FIG. 2A) indicating "11010010", the UE may activate the TCI status IDs # 1, # 2, # 4 and # 7.

FIG. 2B is a diagram showing an example of controlling activation / deactivation of a plurality of TCI states (TCI state sets) with one bit. One TCI state set may correspond to a predetermined number of TCI states (2 in the case of FIG. 2B).

The predetermined number (the number of TCI states included in the TCI state set) may be set in the UE by higher layer signaling, may be specified by specifications, or may be set by higher layer signaling A-CSI. -May be determined based on the number of RS resources. For example, if the number of resources of A-CSI-RS is 3rd number (for example, 4) or less, the predetermined number is 1, and the number of resources of A-CSI-RS is larger than the 3rd number and is the 4th number. (For example, if it is 8) or less, the predetermined number may be determined to be 2, or the like.

In FIG. 2B, each bit of the illustrated 4-bit bitmap corresponds to four TCI state sets. The TCI state set #i (where i = 1-4) of FIG. 2B includes TCI states # 2i-1 and # 2i.

Upon receiving the MAC CE containing the bitmap indicating "1010", the UE may activate the TCI state IDs # 1, # 2, # 5 and # 6 included in the TCI state sets # 1 and # 3. ..

FIG. 3 is a diagram showing another example of information for activating the TCI state of A-CSI-RS according to the first embodiment. In this example, the TCI state set is defined as in the example of FIG. 2B. However, in FIG. 2B, a plurality of TCI state sets can be specified by the bitmap, whereas in FIG. 3, one TCI state set is specified by the value indicated by the specific information bit included in the MAC CE. different.

For example, if the specific information bit contained in the MAC CE is 2 bits, this may specify one of the TCI state sets # 1- # 4.

Upon receiving the MAC CE containing the 2-bit information (for example, "00") indicating one of the TCI state sets, the UE activates the TCI state IDs # 1 and # 2 contained in the TCI state set # 1. You may.

According to the first embodiment described above, activation of the TCI state of A-CSI-RS can be suitably controlled.

<Second embodiment>
In a second embodiment, the UE may activate the TCI status for A-CSI-RS based on implicit information. The control of the measurement of A-CSI-RS in the activated and deactivated TCI states may be the same as in the first embodiment (for example, a first threshold value, a second threshold value, etc.). The explanation is not repeated because the control based on the above may be performed).

The UE may activate the TCI state of a particular A-CSI-RS based on the beam (or TCI state) in use. Here, "in use beam" may mean an active beam for at least one channel (or reference signal), a channel / reference signal corresponding to the active beam, and the like.

The beam in use is, for example, one or more of PDCCH (DCI), PDSCH, PUCCH (Uplink Control Information (UCI)), PUSCH, reference signal for measurement (SRS), and the like. May correspond to the active beam of.

The UE identifies a resource of A-CSI-RS that has a QCL type D relationship with the beam in use, and TCI of one or more A-CSI-RSs based on the resource or the TCI state of the resource. You may activate the state.

The UE may activate the same TCI state as the A-CSI-RS resource having a QCL type D relationship with the beam in use or the beam in use as the TCI state of the A-CSI-RS. That is, the UE may assume that the active TCI state for a channel (or reference signal) is the TCI state of the activated A-CSI-RS.

The UE may activate a beam that is close to (or is expected to be close to) the active beam for a channel (or reference signal) as the TCI state of A-CSI-RS. That is, the UE may activate the beam in use and the beam close to the beam as the TCI state of A-CSI-RS.

4A and 4B are diagrams showing an example of activation of the TCI state of A-CSI-RS according to the second embodiment. In this example, it is assumed that the TCI states # 1 to # 8 are set in the UE as the TCI states.

FIG. 4A shows the TCI state of the A-CSI-RS resource having a QCL type D relationship with the beam in use, the TCI state of the beam in use, the TCI state of activating (or assuming that it is active), and the TCI state. It is a figure which shows an example of the correspondence relation of. For example, the UE may activate TCI states # 1 and # 2 if TCI state # 1 is active.

As described above, the adjacent beam may be a beam whose predetermined index (for example, TCI state ID) corresponds to the adjacent index (included within the range of less than the predetermined value). The adjacent beams may be defined by specifications, or at least one of the predetermined values, correspondences, and the like may be set in the UE by higher layer signaling (eg, RRC signaling).

According to the second embodiment described above, since no explicit information is required for the activation of the TCI state of A-CSI-RS, the activation can be controlled with low overhead.

<Third embodiment>
Assuming that the activation / deactivation of the TCI state of the A-CSI-RS is related to the power on / off of the panel, the present inventors assume that the activation / deactivation of the TCI state for each channel / reference signal in the first place. I found that I didn't have to control activation.

Therefore, in the third embodiment, the UE may assume that the TCI state for A-CSI-RS is activated for each panel of the UE. In this activation, for example, the notification of the CI status ID of the A-CSI-RS using the predetermined signaling shown in the first embodiment is read as the notification of the information (for example, the panel ID) regarding the panel to be activated. May be done by.

The control of the measurement of A-CSI-RS in the activated and deactivated TCI states may be the same as in the first embodiment (for example, a first threshold value, a second threshold value, etc.). The explanation is not repeated because the control based on the above may be performed).

The UE may assume that if a panel is active, all (or some) of the TCI states associated with that panel are active. For the active TCI state associated with a panel, the UE may assume that this TCI state is active for any channel and reference signal. The correspondence between the panel and the TCI state may be set in the UE using higher layer signaling.

FIG. 5 is a diagram showing an example of activation of the TCI state of the panel according to the third embodiment. In this example, it is assumed that the TCI states # 1 to # 8 are set in the UE as the TCI states. It is also assumed that the UE has two panels (panels # 1 and # 2), panel # 1 corresponds to TCI states # 1- # 4, and panel # 2 corresponds to TCI states # 5- # 8. ..

For example, when the UE is instructed by MAC CE to activate the TCI state of panel # 1, it activates all of the TCI states # 1- # 4 associated with panel # 1.

It should be noted that the TCI state is not limited to the UE panel. For example, activation using a predetermined signaling (for example, MAC CE) may be applied to each pair of a base station panel and a UE panel. The correspondence between the panel pair and the TCI state may be set in the UE using higher layer signaling.

For example, a UE that receives a MAC CE instructing to activate a pair of base station panel 1 and UE panel A activates the TCI state associated with this panel pair and all of PDCCH, PDSCH, and CSI-RS. It may be assumed that the TCI state associated with this panel pair is active.

The UE may report information on the panel configuration of the UE to the network (base station) as, for example, UE capability information. The base station sets the correspondence between the panel and the TCI status, and sends signaling (MAC CE, etc.) for activating the panel to the UE that has notified the information about the configuration of the panel. You may.

Information about the panel configuration includes, for example, the number of panels, panel orientation, coherence (fully coherent, partial coherent, non-coherent, etc.), antenna arrangement in a particular direction (horizontal, vertical, etc.), polarized antenna configuration (single). It may include information about at least one such as polarization, cross-polarization, number of planes of polarization, etc.), maximum number of layers of a given channel / signal, number of ports (eg, number of DMRS ports, number of SRS ports).

6A-6F is a diagram showing an example of the antenna configuration of the UE. 6A-6F show an example in which the number of antennas is 8. FIG. 6A corresponds to an antenna configuration having one panel including four cross-polarized antennas arranged in the horizontal direction. FIG. 6B corresponds to an antenna configuration having one panel including two cross-polarized antennas arranged horizontally and vertically. FIG. 6C corresponds to an antenna configuration having two panels including two cross-polarized antennas arranged horizontally (each panel facing in the opposite direction).

FIG. 6D corresponds to an antenna configuration having two panels including four horizontally aligned monopolarized antennas (each panel facing in opposite direction). FIG. 6E corresponds to an antenna configuration having four panels including a cross-polarized antenna (each panel constitutes a side surface of a cube). FIG. 6F corresponds to an antenna configuration having four panels including two horizontally arranged single-polarized antennas (each panel constitutes a side surface of a cube).

According to the third embodiment described above, activation / deactivation of the TCI state of each panel (or power on / off of each panel) can be suitably controlled.

<Others>
The number, maximum, minimum, etc. of active TCI states for A-CSI-RS may be specified to the UE by higher layer signaling (eg, RRC signaling, MAC signaling), etc., or may be specified by the specification. It may be specified implicitly. The number, maximum, minimum, etc. of active TCI states for A-CSI-RS may be determined based on numerology.

For example, the UE may transmit the maximum number of TCI states of A-CSI-RS to the base station using the UE capability information of RRC. The base station may set the number of TCI states to be active in the A-CSI-RS for the UE by higher layer signaling.

The UE may implicitly determine the number of TCI states of A-CSI-RS as shown in the second embodiment.

In the above embodiments, activation of the TCI state of A-CSI-RS has been described, but in the present disclosure, A-CSI-RS is measured for other channels or reference signals (eg, SP-CSI reporting). It may be read as CSI-RS (SP-CSI-RS)). That is, the embodiments of the present disclosure may be applied to channels or reference signals other than A-CSI-RS in addition to or in place of A-CSI-RS.

In addition, "activate" in this disclosure may be read as "at least one of activate and deactivate". "Power on" may be read as "at least one of power on and power off".

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.

FIG. 7 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, at least one of carrier aggregation (CA) and dual connectivity (DC) in which a plurality of fundamental frequency blocks (component carriers) having a system bandwidth (for example, 20 MHz) as one unit is integrated is applied. Can be done.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these may be called.

The radio communication system 1 may support dual connectivity between a plurality of RATs (Radio Access Technology) (Multi-RAT Dual Connectivity (MR-DC)). In MR-DC, the LTE (E-UTRA) base station (eNB) becomes the master node (MN), and the NR base station (gNB) becomes the secondary node (SN). EN-DC: E-UTRA-NR Dual Connectivity), NR base station (gNB) becomes MN, LTE (E-UTRA) base station (eNB) becomes SN Dual connectivity between NR and LTE (E-UTRA) NE-DC: NR-E-UTRA Dual Connectivity) and the like may be included.

The wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NN-DC: NR-NR Dual Connectivity) in which both MN and SN are NR base stations (gNB). ) May be supported.

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

The user terminal 20 can be connected to both the base station 11 and the base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time by using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CC).

Communication can be performed between the user terminal 20 and the base station 11 using a carrier (also referred to as an existing carrier or a legacy carrier) having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth. On the other hand, between the user terminal 20 and the base station 12, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used, or between the user terminal 20 and the base station 11. The same carrier as may be used. The configuration of the frequency band used by each base station is not limited to this.

Further, the user terminal 20 can perform communication in each cell using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD). Further, in each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

Even if the base station 11 and the base station 12 (or between the two base stations 12) are connected by wire (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or by radio. good.

The base station 11 and each base station 12 are connected to the higher station device 30, and are connected to the core network 40 via the higher station device 30. The host station device 30 includes, but is not limited to, an access gateway device, a wireless network controller (RNC), a mobility management entity (MME), and the like. Further, each base station 12 may be connected to the host station apparatus 30 via the base station 11.

The base station 11 is a base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. Further, the base station 12 is a base station having local coverage, such as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and a transmission / reception point. May be called. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

Each user terminal 20 is a terminal corresponding to various communication methods such as LTE, LTE-A, and 5G, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the wireless communication system 1, orthogonal frequency division multiple access (OFDMA) is applied to the downlink as a wireless access method, and a single carrier-frequency division multiple access (SC-FDMA) is applied to the uplink. At least one of Frequency Division Multiple Access) and OFDMA applies.

OFDMA is a multi-carrier transmission system that divides a frequency band into a plurality of narrow frequency bands (subcarriers), maps data to each subcarrier, and performs communication. SC-FDMA is a single carrier transmission that reduces interference between terminals by dividing the system bandwidth into a band composed of one or a continuous resource block for each terminal and using different bands for a plurality of terminals. It is a method. The uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

In the wireless communication system 1, as the downlink channel, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink control channel, and the like shared by each user terminal 20 are used. User data, upper layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. In addition, MIB (Master Information Block) is transmitted by PBCH.

The downlink control channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) and the like. The PDCCH transmits downlink control information (DCI: Downlink Control Information) including scheduling information of at least one of the PDSCH and the PUSCH.

The DCI that schedules DL data reception may be called a DL assignment, and the DCI that schedules UL data transmission may be called a UL grant.

The number of OFDM symbols used for PDCCH may be transmitted by PCFICH. The PHICH may transmit HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH. The EPDCCH is frequency-division-multiplexed with the PDSCH (concurrent downlink data channel), and is used for transmission of DCI and the like like the PDCCH.

In the wireless communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH:) shared by each user terminal 20 are used. Physical Random Access Channel) etc. are used. User data, upper layer control information, etc. are transmitted by PUSCH. In addition, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), and the like. The PRACH transmits a random access preamble to establish a connection with the cell.

In the wireless communication system 1, the downlink reference signal includes a cell-specific reference signal (CRS), a channel state information-reference signal (CSI-RS), and a demodulation reference signal (DMRS:). DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. Further, in the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be called a user terminal specific reference signal (UE-specific reference signal). Further, the reference signal to be transmitted is not limited to these.

(base station)
FIG. 8 is a diagram showing an example of the overall configuration of the base station according to the embodiment. The base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may be configured to include one or more of each.

The user data transmitted from the base station 10 to the user terminal 20 by the downlink is input from the host station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.

The baseband signal processing unit 104 processes user data in the PDCP (Packet Data Convergence Protocol) layer, divides / combines user data, performs RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access). Control) Retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, and other transmission processing are performed in the transmission / reception unit. Transferred to 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 into a radio frequency band and transmits the signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmitter / receiver 103 may consist of a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical fields according to the present disclosure. The transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

On the other hand, as for the uplink signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs high-speed Fourier transform (FFT: Fast Fourier Transform) processing, inverse discrete Fourier transform (IDFT) processing, and error correction for the user data included in the input uplink signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed, and the data is transferred to the host station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of the communication channel, status management of the base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the host station apparatus 30 via a predetermined interface. Further, the transmission line interface 106 transmits / receives a signal (backhaul signaling) to / from another base station 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). May be good.

The transmission / reception unit 103 may receive and / or transmit various information described in each of the above embodiments from the user terminal 20 to the user terminal 20.

FIG. 9 is a diagram showing an example of the functional configuration of the base station according to the embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. It should be noted that these configurations may be included in the base station 10, and some or all of the configurations may not be included in the baseband signal processing unit 104.

The control unit (scheduler) 301 controls the entire base station 10. The control unit 301 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

The control unit 301 controls, for example, the generation of signals in the transmission signal generation unit 302, the allocation of signals in the mapping unit 303, and the like. Further, the control unit 301 controls the signal reception processing in the reception signal processing unit 304, the measurement of the signal in the measurement unit 305, and the like.

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resources). Allocation) is controlled. Further, the control unit 301 controls the generation of the downlink control signal, the downlink data signal, and the like based on the result of determining the necessity of the retransmission control for the uplink data signal.

The control unit 301 controls scheduling of synchronization signals (for example, PSS / SSS) and downlink reference signals (for example, CRS, CSI-RS, DMRS).

The control unit 301 controls to form a transmission beam and / or a reception beam by using a digital BF (for example, precoding) by the baseband signal processing unit 104 and / or an analog BF (for example, phase rotation) by the transmission / reception unit 103. May be done.

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303. The transmission signal generation unit 302 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical fields according to the present disclosure.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying the downlink data allocation information and / or a UL grant for notifying the uplink data allocation information based on an instruction from the control unit 301. Both DL assignments and UL grants are DCI and follow the DCI format. Further, the downlink data signal is subjected to coding processing, modulation processing, and the like according to a coding rate, a modulation method, and the like determined based on channel state information (CSI) from each user terminal 20 and the like.

Based on the instruction from the control unit 301, the mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource and outputs it to the transmission / reception unit 103. The mapping unit 303 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common recognition in the technical field according to the present disclosure.

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

The measuring unit 305 performs measurement on the received signal. The measuring unit 305 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, or the like based on the received signal. The measuring unit 305 has received power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). , Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

The transmission / reception unit 103 may transmit trigger information (for example, a CSI request field included in the DCI) that triggers the beam measurement of the A-CSI-RS to the user terminal 20. The transmission / reception unit 103 may receive a beam measurement result (beam report) based on the A-CSI-RS from the user terminal 20.

(User terminal)
FIG. 10 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. The transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may be configured to include one or more of each.

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmitter / receiver 203 may consist of a transmitter / receiver, a transmitter / receiver circuit, or a transmitter / receiver described based on common recognition in the technical fields according to the present disclosure. The transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction / decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Further, among the downlink data, the broadcast information may also be transferred to the application unit 205.

On the other hand, the uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and is performed in the transmission / reception unit. Transferred to 203.

The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits the baseband signal. The radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

FIG. 11 is a diagram showing an example of the functional configuration of the user terminal according to the embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. It should be noted that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on the common recognition in the technical field according to the present disclosure.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. Further, the control unit 401 controls the signal reception processing in the reception signal processing unit 404, the signal measurement in the measurement unit 405, and the like.

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the base station 10 from the received signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.

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

The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401, and outputs the uplink signal to the mapping unit 403. The transmission signal generation unit 402 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on the common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 402 generates an uplink control signal regarding delivery confirmation information, channel state information (CSI), and the like, for example, based on an instruction from the control unit 401. Further, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the base station 10 includes a UL grant.

Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to the radio resource and outputs it to the transmission / reception unit 203. The mapping unit 403 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common recognition in the technical field according to the present disclosure.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the base station 10. The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common recognition in the technical field according to the present disclosure. Further, the received signal processing unit 404 can form a receiving unit according to the present disclosure.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. Further, the reception signal processing unit 404 outputs the reception signal and / or the signal after the reception processing to the measurement unit 405.

The measuring unit 405 performs measurement on the received signal. The measuring unit 405 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present disclosure.

For example, the measuring unit 405 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 405 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

The transmission / reception unit 203 uses trigger information (for example, a CSI request field included in DCI) that triggers beam measurement of an aperiodic channel state information reference signal (A-CSI-RS). May be received. The transmission / reception unit 203 may transmit a beam measurement result (beam report) based on the A-CSI-RS to the base station 10.

The control unit 401 may control the beam measurement of the triggered A-CSI-RS based on whether or not the TCI state of the A-CSI-RS is activated.

When the TCI state of the A-CSI-RS is activated, the control unit 401 receives the trigger information and the time from receiving the A-CSI-RS (called an aperiodic triggering offset). If it is equal to or higher than the first threshold value, the beam measurement of the A-CSI-RS may be performed.

If the TCI state of the A-CSI-RS is not activated and the aperiodic triggering offset is equal to or greater than the first threshold value and less than the second threshold value, the control unit 401 can use the A-CSI-RS. It is not necessary to perform the beam measurement of.

The control unit 401 may assume that the TCI state of the A-CSI-RS is activated based on a predetermined MAC CE.

The control unit 401 may assume that the TCI state of the A-CSI-RS is activated based on at least one of the beam in use and the beam in the vicinity of the beam.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit, a transmitter, or the like. As described above, the method of realizing each of them is not particularly limited.

For example, the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..

In addition, in this disclosure, the wording of a device, a circuit, a device, a section, a unit and the like can be read as each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function of the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

The memory 1002 is a computer-readable recording medium, such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically EPROM), RAM (Random Access Memory), or at least other suitable storage medium. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (CD-ROM (Compact Disc ROM), etc.)), a digital versatile disc, and the like. At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. Communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, the above-mentioned transmission / reception antenna 101 (201), amplifier unit 102 (202), transmission / reception unit 103 (203), transmission line interface 106, and the like may be realized by the communication device 1004. The transmission / reception unit 103 (203) may be physically or logically separated from each other by the transmission unit 103a (203a) and the reception unit 103b (203b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the user terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC: Component Carrier) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission / reception. At least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.

The slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). In addition, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. The mini-slot may also be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in a time unit larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, and one slot or one minislot may be referred to as a TTI. You may. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate radio resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, and the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

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

The RB may also include one or more symbols in the time domain and may be one slot, one minislot, one subframe or one TTI in length. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as a wireless frame, a subframe, a slot, a minislot, and a symbol are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained in a slot, the number of symbols and RBs contained in a slot or minislot, and included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, radio resources may be indicated by a given index.

The names used for parameters and the like in the present disclosure are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements. Is not a limited name in any way.

The information, signals, etc. described in the present disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Further, information, signals, and the like can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / output via a plurality of network nodes.

The input / output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed using a management table. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to another device.

The notification of information is not limited to the embodiments / embodiments described in the present disclosure, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, etc.). It may be carried out by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling, other signals, or a combination thereof.

The physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

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

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

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (QCL: Quasi-Co-Location)", "TCI state (Transmission Configuration Indication state)", "spatial relationship" (Spatial relation), "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", " Terms such as rank, resource, resource set, resource group, beam, beam width, beam angle, antenna, antenna element, and panel are compatible. Can be used for.

In the present disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "Transmission point (TP)", "Reception point (RP)", "Transmission / reception point (TRP)", "Panel", "Cell" , "Sector", "cell group", "carrier", "component carrier" and the like can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations include subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.

At least one of a base station and a mobile station may be referred to as a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the user terminal 20 may have the function of the base station 10 described above. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are performed by one or more network nodes other than the base station and the base station (for example, the base station). It is clear that it can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these) or a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication). system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademarks) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), LTE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other systems using appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" as used in the present disclosure may include a wide variety of actions. For example, "judgment" means "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up", "search", "inquiry". For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

In addition, "judgment (decision)" includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as "judgment (decision)" such as "accessing" (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The terms "connected", "coupled", or any variation thereof, as used in this disclosure, are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are "connected" or "joined" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In the present disclosure, when two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example a, an and the in English, the disclosure may include the plural nouns following these articles.

Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as an amended or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims (6)

A receiver that receives trigger information that triggers beam measurement of an aperiodic channel state information reference signal (A-CSI-RS).
A user having a control unit that controls beam measurement of the A-CSI-RS based on whether or not the TCI (Transmission Configuration Indication state) state of the A-CSI-RS is activated. Terminal. When the TCI state of the A-CSI-RS is activated, the control unit determines that the time from receiving the trigger information to receiving the A-CSI-RS is equal to or greater than the first threshold value. The user terminal according to claim 1, wherein the beam measurement of the A-CSI-RS is performed. When the TCI state of the A-CSI-RS is not activated, the control unit has a time from receiving the trigger information to receiving the A-CSI-RS equal to or greater than the first threshold value and the first. The user terminal according to claim 2, wherein if the threshold value is less than the threshold value of 2, the beam measurement of the A-CSI-RS is not performed. Any of claims 1 to 3, wherein the control unit assumes that the TCI state of the A-CSI-RS is activated based on a predetermined MAC CE (Medium Access Control Control Element). User terminal described in Crab. Any of claims 1 to 3, wherein the control unit assumes that the TCI state of the A-CSI-RS is activated based on the beam in use and the beam close to the beam. User terminal described in Crab. A step of receiving trigger information that triggers a beam measurement of an aperiodic channel state information reference signal (A-CSI-RS), and
A user terminal comprising: a step of controlling the beam measurement of the A-CSI-RS based on whether or not the TCI (Transmission Configuration Indication state) state of the A-CSI-RS is activated. Wireless communication method.

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