WO2021038659A1 - Terminal and wireless communication method - Google Patents

Abstract

A terminal according to one embodiment of the present disclosure has: a reception unit that receives a downlink control channel used for transmission of downlink control information that triggers an aperiodic tracking reference signal; and a control unit that determines a quasi-co-location relationship corresponding to the aperiodic tracking reference signal, on the basis of the downlink control channel and the offset value between aperiodic tracking reference signals.

Description

Terminal and wireless communication method

The present disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems.

In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

A successor system to LTE (for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.

In an existing LTE system (for example, LTE Rel.8-13), a user terminal (UE: User Equipment) is used for downlink control information (also referred to as Downlink Control Information (DCI), DL assignment, etc.) from a wireless base station. Based on this, the reception of the downlink shared channel (for example, Physical Downlink Shared Channel (PDSCH)) is controlled. Further, the UE controls transmission of an uplink shared channel (for example, Physical Uplink Shared Channel (PUSCH)) based on DCI (also referred to as UL grant or the like).

In future wireless communication systems (eg, NR), the UE will use the signal based on information about the pseudo-colocation (Quasi-Co-Location (QCL)) of at least one of the signal and channel (referred to as signal / channel). Control of / channel reception processing (eg, demapping, demodulation, decoding, reception beam formation, etc.) and transmission processing (eg, mapping, modulation, coding, precoding, transmission beam formation, etc.) is being considered. ..

In addition, the NR supports a periodic tracking reference signal (P-TRS) and an aperiodic TRS (A-PTS) associated with the P-TRS (for example, using the P-TRS as a QCL source). Is being considered. On the other hand, from the viewpoint of improving the utilization efficiency of TRS resources, it is expected to support A-TRS which is not related to P-TRS. However, in such a case, how to control the communication using A-TRS (or aperiodic CSI-RS) which is not related to P-TRS becomes a problem.

Therefore, one of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately performing communication using aperiodic TRS (or aperiodic CSI-RS).

The terminal according to one aspect of the present disclosure includes a receiving unit that receives a downlink control channel used for transmitting downlink control information that triggers a reference signal for aperiodic tracking, the downlink control channel, and the aperiodic tracking. It is characterized by having a control unit for determining a pseudo-collocation relationship corresponding to the aperiodic tracking reference signal based on an offset value between the reference signals.

According to one aspect of the present disclosure, communication using aperiodic TRS (or aperiodic CSI-RS) can be appropriately performed.

1A and 1B are diagrams showing an example of a stand-alone A-TRS. 2A and 2B are diagrams showing an example of the QCL assumption of A-TRS (or A-CSI-RS). FIG. 3 is a diagram showing an example of setting the A-TRS resource. FIG. 4 is a diagram showing another example of setting the A-TRS resource. FIG. 5 is a diagram showing another example of setting the A-TRS resource. FIG. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 9 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

(TCI, spatial relationship, QCL)
In the NR, reception processing (for example, reception, demapping, demodulation, etc.) in the UE of at least one of the signal and the channel (expressed as a signal / channel) is based on the transmission configuration indication state (TCI state). Controlling at least one of decoding) and transmission processing (eg, at least one of transmission, mapping, precoding, modulation, and coding) is being considered.

The TCI state may represent what applies to the downlink signal / channel. The equivalent of the TCI state applied to the uplink signal / channel may be expressed as a spatial relation.

The TCI state is information related to signal / channel pseudo collocation (Quasi-Co-Location (QCL)), and may be called spatial reception parameters, spatial relation information (SRI), or the like. The TCI state may be set in the UE per channel or per signal.

QCL is an index showing the statistical properties of signals / channels. For example, when one signal / channel and another signal / channel have a QCL relationship, a Doppler shift, a Doppler spread, and an average delay are performed between these different signals / channels. ), Delay spread, and spatial parameter (for example, spatial Rx parameter) can be assumed to be the same (QCL for at least one of these). You may.

The spatial reception parameter may correspond to the received beam of the UE (for example, the received analog beam), or the beam may be specified based on the spatial QCL. The QCL (or at least one element of the QCL) in the present disclosure may be read as sQCL (spatial QCL).

A plurality of types (QCL types) may be specified for the QCL. For example, four QCL types AD with different parameters (or parameter sets) that can be assumed to be the same may be provided, and the parameters are shown below:
QCL Type A (QCL-A): Doppler shift, Doppler spread, average delay and delay spread,
-QCL type B (QCL-B): Doppler shift and Doppler spread,
QCL type C (QCL-C): Doppler shift and average delay,
-QCL type D (QCL-D): Spatial reception parameter.

The UE may assume that a given control resource set (Control Resource Set (CORESET)) has a specific QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. , QCL assumption (QCL assumption) may be called.

The UE may determine at least one of the transmission beam (Tx beam) and the reception beam (Rx beam) of the signal / channel based on the TCI state of the signal / channel or the QCL assumption.

The TCI state is, for example, a target channel (in other words, a reference signal (Reference Signal (RS)) for the channel) and another signal (for example, another reference signal (Reference Signal (RS))). It may be information about the QCL. The TCI state may be set (instructed) by higher layer signaling, physical layer signaling, or a combination thereof.

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

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

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

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

Further, RS (DL-RS) having a QCL relationship with the channel is, for example, a synchronization signal block (Synchronization Signal Block (SSB)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and measurement. It may be at least one of the reference signal (Sounding Reference Signal (SRS)). Alternatively, the DL-RS may be a CSI-RS (also referred to as a Tracking Reference Signal (TRS)) used for tracking or a reference signal (also referred to as a QRS) used for QCL detection.

The SSB is a signal block including at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)), a secondary synchronization signal (Secondary Synchronization Signal (SSS)), and a broadcast channel (Physical Broadcast Channel (PBCH)). The SSB may be referred to as an SS / PBCH block.

The information element of the TCI state (“TCI-state IE” of RRC) set by the upper layer signaling may include one or more QCL information (“QCL-Info”). The QCL information may include at least one of information related to DL-RS having a QCL relationship (DL-RS related information) and information indicating a QCL type (QCL type information). The DL-RS related information includes the DL-RS index (for example, SSB index, non-zero power CSI-RS (Non-Zero-Power (NZP) CSI-RS) resource ID (Identifier)), and the index of the cell in which the RS is located. , Information such as the index of the Bandwidth Part (BWP) where the RS is located may be included.

<TCI state for PDCCH>
Information about the PDCCH (or DeModulation Reference Signal (DMRS) antenna port associated with the PDCCH) and the QCL with a given RS may be referred to as the TCI state for the PDCCH or the like.

The UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on the upper layer signaling. For example, for the UE, one or more (K) TCI states may be set by RRC signaling for each CORESET.

The UE may activate one of the plurality of TCI states set by RRC signaling for each CORESET by MAC CE. The MAC CE may be referred to as a UE-specific PDCCH TCI state indicating MAC CE (TCI State Indication for UE-specific PDCCH MAC CE). The UE may monitor the CORESET based on the active TCI state corresponding to the CORESET.

<TCI state for PDSCH>
Information about the PDSCH (or DMRS antenna port associated with the PDSCH) and the QCL with a given RS may be referred to as the TCI state for the PDSCH and the like.

The UE may notify (set) M (M ≧ 1) TCI states (QCL information for M PDSCHs) for PDSCH by higher layer signaling. The number M of TCI states set in the UE may be limited by at least one of the UE capability and the QCL type.

The DCI used for scheduling the PDSCH may include a predetermined field (for example, may be referred to as a TCI field, a TCI state field, etc.) indicating the TCI state for the PDSCH. The DCI may be used for scheduling the PDSCH of one cell, and may be called, for example, DL DCI, DL assignment, DCI format 1_0, DCI format 1-1-1 and the like.

Whether or not the TCI field is included in the DCI may be controlled by the information notified from the base station to the UE. The information may be information indicating whether or not a TCI field exists in DCI (present or absent) (for example, TCI existence information, TCI existence information in DCI, upper layer parameter TCI-PresentInDCI). The information may be set in the UE by, for example, higher layer signaling.

When more than 8 types of TCI states are set in the UE, 8 or less types of TCI states may be activated (or specified) using MAC CE. The MAC CE may be referred to as a TCI state activation / deactivation MAC CE for UE-specific PDSCH (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field in the DCI may indicate one of the TCI states activated by MAC CE.

When the UE sets the TCI existence information set to "enabled" for the CORESET that schedules the PDSCH (CORESET used for the PDCCH transmission that schedules the PDSCH), the UE sets the TCI field. It may be assumed that it exists in the DCI format 1-11 of the PDCCH transmitted on the CORESET.

When the TCI existence information is not set for the CORESET that schedules the PDSCH, or the PDSCH is scheduled in the DCI format 1_0, the reception of the DL DCI (DCI that schedules the PDSCH) and the PDSCH corresponding to the DCI If the time offset between the reception of the PDSCH is greater than or equal to the threshold value, the UE uses the TCI state or QCL assumption for the PDSCH to determine the QCL of the PDSCH antenna port for the PDCCH transmission that schedules the PDSCH. It may be assumed that it is the same as the TCI state or QCL assumption applied to.

Note that the CORESET-ID may be an ID (ID for identifying the CORESET) set by the RRC information element "ControlResourceSet".

<QCL type A RS and QCL type D RS in TCI state>
Rel. At 15, the TCI state for at least one of the PDCCH and PDSCH is set to both a QCL type A RS and a QCL type D RS, or only a QCL type A RS.

When a tracking reference signal (hereinafter, also referred to as TRS) is set as the RS of QCL type A, the TRS is different from the DMRS of PDCCH or PDSCH, and the same TRS (P-TRS) is periodically transmitted over a long period of time. Is expected to occur. The UE can measure the TRS and calculate the average delay, delay spread, and so on.

A UE in which the P-TRS is set as the QCL type A RS in the TCI state of the PDCCH or PDSCH DMRS has a QCL type A parameter (mean delay, delay) between the PDCCH or PDSCH DMRS and the P-TRS. Since it can be assumed that the spreads (spreads, etc.) are the same, the QCL type A parameters (average delay, delay spreads, etc.) of DMRS of PDCCH or PDSCH can be obtained from the measurement results of P-TRS. When performing at least one channel estimation of PDCCH and PDSCH, the UE can perform more accurate channel estimation by using the measurement result of P-TRS.

A UE in which a QCL type D RS is set can determine a UE reception beam (spatial domain reception filter, UE spatial domain reception filter) using the QCL type D RS, and searches for CORESET0 (CORESET zero). A monitoring occasion of space 0 (search space zero) (type 0-PDCCH monitoring occasion) can be determined.

The TCI state for at least one of PDCCH and PDSCH may indicate RS and the serving cell of the UE in which the RS is set. Only when the QCL type is set to type C or type D, the RS may be located in a serving cell other than the cell in which the TCI state is set. Therefore, in carrier aggregation (CA), the RS of QCL type A set as the TCI state of the secondary cell (SCell) may be the TRS of the SCell. A TRS may be transmitted in the SCell to configure the UE with a QCL type A RS in at least one TCI state of the SCell's PDCCH and PDSCH.

For the PDCCH DMRS, the UE may expect the TCI state to indicate one of the following QCL types:
A QCL type A having a CSI-RS resource in the NZP-CSI-RS resource set with the upper layer parameter trs-Info (TRS information) set, and a QCL type having the same CSI-RS resource if available. D
QCL type A with CSI-RS resources in the NZP-CSI-RS resource set with the upper layer parameter trs-Info set, and NZP- set with the upper layer parameter repetition if available. QCL type D with CSI-RS resources in the CSI-RS resource set
-QCL type A with CSI-RS resources in the NZP-CSI-RS resource set for which neither upper layer parameter trs-Info nor upper layer parameter repetition is set, and QCL type with the same CSI-RS resources if available. D

The trs-Info set in the NZP-CSI-RS resource set may indicate that the antenna ports for all NZP-CSI-RS resources in the NZP-CSI-RS resource set are the same. When repetition is set in the NZP-CSI-RS resource set, the NZP-CSI-RS resources in the NZP-CSI-RS resource set have the same DL spatial domain transmission filter (base station spatial domain) for all symbols. It may be transmitted using the same number of ports as the transmission filter and the base station transmission beam).

The TCI state of PDSCH for DMRS is the same as the TCI state of PDCCH for DMRS.

<P-TRS / A-TRS>
In NR, it is considered that periodic TRS (P-TRS) and aperiodic TRS (A-TRS or AP-TRS) are supported as reference signals (TRS) for tracking. In addition, Rel. In 15, A-TRS is specified to be set in association with P-TRS.

For example, A-TRS has the same bandwidth as P-TRS (for example, the same RB arrangement). Further, a predetermined QCL relationship (for example, QCL-type A, QCL-type D) is applied to the A-TRS with the P-TRS. That is, the A-TRS set in association with the P-TRS needs to use the P-TRS as the QCL source (QCL source).

In P-TRS, the TCI state is set by upper layer signaling. Therefore, it is necessary for the network to transmit the P-TRS corresponding to each TCI state of the DL channel (for example, PDCCH or PDSCH) set by the upper layer signaling to the UE. For example, if the number of beams (or SSB number) set or supported in the cell is 64, the network needs to transmit 64 P-TRS.

When using A-TRS, Rel. In 15, the A-TRS is set in association with the P-TRS (P-TRS as a QCL source), so that the P-TRS needs to be transmitted (or set). As described above, when the A-TRS is set in association with the P-TRS, it becomes difficult to sufficiently improve the resource utilization efficiency even when the A-TRS is transmitted.

Therefore, it is assumed that NR (for example, Rel.16 or later) supports A-TRS that is not associated with P-TRS. In such a case, the network may transmit A-TRS to the UE according to the beam used by the UE (for example, the TCI state of PDCCH or PDSCH) (it is not necessary to transmit P-TRS). Therefore, the TRS resource can be reduced and the resource utilization efficiency can be improved.

A-TRS that is not related to P-TRS may be called stand-alone A-TRS or stand-alone AP-TRS.

On the other hand, when supporting A-TRS (or aperiodic CSI-RS) that is not related to P-TRS, how to control communication using the A-TRS becomes a problem.

Therefore, the present inventors have studied communication control using the stand-alone A-TRS, and have reached the present invention.

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.

In the present disclosure, a panel, an Uplink (UL) transmission entity, a TRP, a reference signal for demodulation (DeModulation Reference Signal (DMRS)) port, a DMRS port group, a code division multiplexing (CDM) group, and a predetermined The group related to the reference signal, the control resource set (COntrol REsource SET (CORESET)) group, CORESET, PDSCH, code word, base station, and the like may be read as each other. Further, the panel Identifier (ID) and the panel may be read as each other. TRP ID and TRP may be read as each other.

Hereinafter, the RS of the QCL type X in the TCI state may mean an RS having a relationship of a certain channel / signal (DMRS) and the QCL type X, and this RS is the QCL source of the QCL type X in the TCI state. May be called.

(First aspect)
In the first aspect, a case where at least one of A-TRS measurement and reporting is triggered and controlled by downlink control information (DCI) will be described. In the following description, A-TRS may be read as A-CSI-RS.

The UE may control at least one of the measurements and reports of A-TRS that are not related to P-TRS based on DCI. For example, the network utilizes DCI to trigger (or activate) at least one of A-TRS-based measurements and reporting of measurement results.

The network (for example, a base station) may set one or more trigger states (for example, Aperiodic trigger state) in the UE by using upper layer signaling (see FIG. 1A). Further, the network may specify one trigger state to the UE from the trigger state (trigger state) set by the upper layer signaling by using the CSI request field included in the DCI. For example, the UE may transmit the measurement result using the PUSCH based on the DCI when the A-PTS is triggered by the DCI (for example, UL grant).

The trigger state may include at least one of information about CSI reporting, information about resources, and information about QCL. The information regarding the CSI report may be information that identifies the CSI report (eg, the CSI report index). The information about the resource may be the information about the resource of TRS (for example, the index of the CSI-RS resource set). The information regarding the QCL may be information indicating the QCL relationship (for example, SSB index, CSI-RS index (NZP-CSI-RS index), etc.).

In A-TRS-based CSI reporting, DCI can be used to simultaneously trigger A-TRS measurements and A-TRS-based CSI reporting, allowing dynamic use of RS resources and uplink resources efficiently. Can trigger CSI reports. Further, since the A-TRS may be transmitted based on the beam (or TCI state) used by the UE, the P-TRS may not be transmitted.

Further, the QCL type A parameters (average delay, delay spread, etc.) of DMRS of PDCCH or PDSCH may be determined from the measurement result of A-TRS. When performing at least one channel estimation of PDCCH and PDSCH, the UE can perform more accurate channel estimation by using the measurement result of A-TRS (see FIG. 1B).

On the other hand, the offset (also referred to as scheduling offset) between the DCI that triggers the A-TRS and the A-TRS (for example, A-CSI-RS) that is triggered by the DCI is determined in consideration of the UE capability. It is also assumed that it will be restricted so that it does not fall below the threshold value of.

The scheduling offset is the offset between the last symbol of the PDCCH carrying the DCI that triggers the A-TRS (or A-CSI-RS) resource set and the first symbol of the A-TRS resource of that resource set. It may mean. As the scheduling offset of A-TRS, 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 information of the scheduling offset of A-TRS may correspond to the RRC parameter "aperiodicTriggeringOffset".

The predetermined threshold value may be information reported from the UE to the network (for example, ThresholdSched-Offset). The UE may report information about a predetermined threshold depending on the UE ability from receiving the trigger to making the measurement based on A-TRS. The UE capability may be referred to as A-TRS beam switching timing (AP-CSI-RS beam switching timing), simply beam switching timing, beam switching timing (RRC parameter "beamSwitch Timing"), or the like.

The predetermined threshold value may be applied to at least one of the first frequency band (FR2: Frequency Range 2) and the 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 predetermined threshold value may take a different value for each subcarrier interval (for example, 60 kHz, 120 kHz, etc.).

For example, the UE corresponds to the QCL (or TCI state) specified by the CSI trigger (request) field of the DCI when the scheduling offset of the A-TRS is greater than or equal to the threshold reported by the UE (the threshold of the scheduling offset). QCL) may be assumed. In this case, the UE may receive the A-TRS based on the TCI state specified by DCI.

On the other hand, when the scheduling offset of A-TRS is less than the threshold value reported by the UE (scheduling offset threshold value), how to control it becomes a problem. When the scheduling offset is smaller than the scheduling offset threshold value, it is conceivable that the A-TRS is not set. In such a case, the setting of A-TRS is restricted.

Therefore, in the first aspect, when the scheduling offset of the A-TRS is smaller than the scheduling offset threshold, the UE uses the A-TRS (or A-CSI-RS) based on at least one of the following options 1 to 4. ) May be used for communication control (for example, assuming QCL).

<Option 1>
If the scheduling offset of the A-TRS is less than the scheduling offset threshold, the UE may assume a predetermined QCL (or TCI state) defined or set in advance. A predetermined QCL defined or set in advance may be referred to as a default QCL (or default TCI state). In this case, the UE may control the reception of the A-TRS (or A-CSI-RS) assuming the default QCL.

The default QCL may be a QCL corresponding to a predetermined PDCCH (or DMRS for PDCCH).

For example, assume that the scheduling offset is less than the scheduling offset threshold. In such a case, the UE may assume that the QCL corresponding to the smallest CORESET-ID in the monitoring search space in the latest (latest) slot in the active BWP of the serving cell is the default QCL.

For example, the UE may assume that the A-TRS is a DL-RS and QCL based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID. The latest slot may be, for example, a slot that receives the DCI that triggers the A-TRS.

Note that the CORESET-ID may be an ID (ID for identifying the CORESET) set by the RRC information element "ControlResourceSet".

In FIG. 2A, the scheduling offset is equal to or greater than the scheduling offset threshold. Therefore, the UE may assume that the A-TRS is a QCL with an RS (QCL information) indicated by the corresponding DCI.

In FIG. 2B, the scheduling offset is smaller than the scheduling offset threshold. Therefore, the UE may assume that the A-TRS is an RS (eg, a DMRS for PDCCH) and a QCL in the TCI state for PDCCH corresponding to the smallest CORESET-ID in the latest slot.

<Option 2>
If the scheduling offset of the A-TRS is less than the scheduling offset threshold, the UE triggers or schedules the A-TRS (or A-CSI-RS) and the A-TRS (or A-CSI-RS). It may be assumed that the DCI to be used is a QCL.

For example, when the scheduling offset is larger than the scheduling offset threshold, the UE performs an A-TRS reception or reporting operation assuming the QCL of the RS port (for example, DMRS port) corresponding to the PDCCH used for transmitting the DCI. You may control it.

<Option 3>
If the scheduling offset of the A-TRS is less than the scheduling offset threshold, the UE will perform the A-TRS (or A-CSI-RS) and the time prior to the A-TRS (or A-CSI-RS). It may be assumed that the channel or reference signal arranged at a predetermined position (for example, the closest position) in the region is a QCL.

For example, when a DL channel or reference signal is placed in the symbol immediately preceding the A-TRS (or A-CSI-RS), the UE receives the A-TRS assuming the QCL of the DL channel or reference signal. Alternatively, the reporting operation may be controlled.

<Option 4>
If the scheduling offset of the A-TRS is less than the scheduling offset threshold, the UE will assume a predetermined QCL corresponding to another DL signal transmitted with the same symbol as the A-TRS (or A-CSI-RS). Alternatively, the reception of CSI-RS may be controlled by using the TCI state). That is, even if the scheduling offset of the A-TRS is less than the scheduling offset threshold value, the QCL of the other DL signal is assumed when there is another DL signal in the same symbol as the A-TRS.

For example, the UE may apply the QCL assumption of the other DL signal when receiving the A-TRS if there is another DL signal whose TCI state is indicated in the same symbol as the A-TRS. ..

Other DL signals are PDSCHs with a scheduling offset greater than or equal to a predetermined threshold (ie, the offset from the reception of the DCI to the start of reception of the PDSCH scheduled by the DCI is greater than or equal to the predetermined threshold), the beam switch reported by the UE. It may be at least one of AP-CSI-RS, P-CSI-RS, and SP-CSI-RS having a scheduling offset equal to or higher than the timing.

If the scheduling offset of the A-TRS is less than the scheduling offset threshold, the UE first considers option 4 and uses at least one of options 1 to 3 if there are no other DL signals on the same symbol as the A-TRS. You may.

In this way, when the scheduling offset of the A-TRS is less than the scheduling offset threshold value, the A-TRS setting can be flexibly controlled by assuming a QCL different from the QCL information notified by the DCI. ..

(Second aspect)
In the second aspect, the resource setting of A-TRS corresponding to each beam (or TCI state) of A-TRS will be described. The second aspect may be applied separately from the first aspect, or may be applied in combination with the first aspect.

A-TRS resources may be set separately according to each beam (or TCI state) of A-TRS (see FIG. 3). The A-TRS resource may be at least one of a time resource, a frequency resource, and a code resource.

The UE may assume that the resources of the A-TRS (for example, at least one of the time, frequency and code) differ depending on the beam (or TCI state) of the A-TRS. As shown in FIG. 3, by configuring the A-TRS resources to be set (or changed) separately according to each TCI state of the A-TRS, the UE has all TRS (beams are different). TRS) can be measured.

For example, the TCI state of the DL channel (PDCCH or PDSCH) is set based on the A-TRS (for example, the measurement result of the A-TRS is used for receiving processing of the DL channel (for example, at least one of demodulation and channel estimation)). (Use) is assumed. In such a case, the UE changes the beam of the A-TRS (here, the change from the TCI state # 0 to the TCI state # 3) by setting the resource corresponding to each beam of the A-TRS separately. ) Is instructed, A-TRS can be measured appropriately.

Note that FIG. 3 shows a case where a common (or predetermined range) A-TRS resource is set for a plurality of A-TRS beams (here, TCI states # 0 to # 3). Not limited to this. For example, the A-TRS resource may be associated separately for each of a plurality of A-TRS beams (here, TCI states # 0 to # 3) (see FIG. 4). The correspondence between the TCI state and the resource may be set from the network to the UE by higher layer signaling.

Alternatively, the same A-TRS resource (or one A-TRS) may be associated with a plurality of A-TRS beams (or TCI states) (see FIG. 5). FIG. 5 shows a case where the same A-TRS resource is set for A-TRS in different TCI states (here, TCI state # 0 and TCI state # 3).

In such a case, the A-TRS can be used as a QCL resource after a period corresponding to a predetermined scheduling offset threshold has elapsed since the A-TRS (A-CSI-TS) was triggered based on the DCI (DL channel). (Reception processing is possible) may be configured. As a result, even when the same A-TRS resource is set in different TCI states, reception processing (for example, demodulation, decoding) of a DL channel (for example, at least one of PDCCH and PDSCH) based on A-TRS is performed. Etc.) can be performed appropriately.

As shown in FIG. 5, when the same resource is set in a plurality of TCI states (or beams), the A-TRS resource may be set for each UE. As a result, it is possible to suppress the occurrence of interference between UEs that utilize different TCI states.

As shown in FIGS. 3 and 4, when resources are set for each TCI state (or beam), the resources used are also changed as the TCI state is changed. In this case, the network may transmit A-TRS for the number of beams at the maximum, and UEs applying the same beam may receive A-TRS with a common resource. The network may transmit (or set corresponding resources) A-TRS for the number of beams actually used by the connected UE. As a result, resource utilization efficiency can be improved.

(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. 6 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..

Further, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technology (RAT) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and dual connectivity between NR and LTE (NR-E). -UTRA Dual Connectivity (NE-DC)) may be included.

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

The wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) 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. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).

Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2. 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, and for example, FR1 may correspond to a frequency band higher than FR2.

Further, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

The plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the upper station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.

The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

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

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

The wireless access method may be called a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

In the wireless communication system 1, as downlink channels, downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), and downlink control channels (Physical Downlink Control) shared by each user terminal 20 are used. Channel (PDCCH)) and the like may be used.

Further, in the wireless communication system 1, as the uplink channel, the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), and the random access channel shared by each user terminal 20 are used. (Physical Random Access Channel (PRACH)) or the like may be used.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH. User data, upper layer control information, and the like may be transmitted by the PUSCH. In addition, Master Information Block (MIB) may be transmitted by PBCH.

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.

The DCI that schedules PDSCH may be called DL assignment, DL DCI, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. The PDSCH may be read as DL data, and the PUSCH may be read as UL data.

A control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for detecting PDCCH. CORESET corresponds to a resource that searches for DCI. The search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (Channel State Information (CSI)), delivery confirmation information (for example, may be called Hybrid Automatic Repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.) and scheduling request (Scheduling Request ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble to establish a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" at the beginning of various channels.

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

The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like. In addition, SS, SSB and the like may also be called a reference signal.

Further, in the wireless communication system 1, even if a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), or the like is transmitted as an uplink reference signal (Uplink Reference Signal (UL-RS)). Good. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal).

(base station)
FIG. 7 is a diagram showing an example of the configuration of the base station according to the embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. The control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.

Note that, 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. A part of the processing of each part described below may be omitted.

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like. The control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.

The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on common recognition in the technical fields according to the present disclosure. be able to.

The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 120 (transmission processing unit 1211) processes, for example, the Packet Data Convergence Protocol (PDCP) layer and the Radio Link Control (RLC) layer for data, control information, etc. acquired from the control unit 110 (for example,). RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.

The transmission / reception unit 120 (transmission processing unit 1211) performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. The base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.

The transmission / reception unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..

On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, or the like on the radio frequency band signal received by the transmission / reception antenna 130.

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal. The measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)). , Signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 110.

The transmission line interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.

The transmission / reception unit 120 transmits the aperiodic tracking reference signal and the downlink control channel used for transmitting the downlink control information that triggers the aperiodic tracking reference signal. The transmission / reception unit 120 may transmit information regarding the correspondence between the resource of the aperiodic tracking reference signal and the TCI state.

The control unit 110 may control the pseudo-collocation relationship corresponding to the aperiodic tracking reference signal based on the offset value between the downlink control channel and the aperiodic tracking reference signal.

(User terminal)
FIG. 8 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

Note that this example mainly shows the functional blocks of the feature portion in the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.

The transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.

The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.

Whether or not to apply the DFT process may be based on the transform precoding setting. The transmission / reception unit 220 (transmission processing unit 2211) described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled. The DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.

The transmission / reception unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..

On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.

The transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

The transmission / reception unit 220 (measurement unit 223) may perform measurement on the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 223 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 210.

The transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.

The transmission / reception unit 220 receives the aperiodic tracking reference signal and the downlink control channel used for transmitting the downlink control information that triggers the aperiodic tracking reference signal. The transmission / reception unit 220 may receive information regarding the correspondence between the resource of the aperiodic tracking reference signal and the TCI state. Further, the transmission / reception unit 220 may transmit information regarding the threshold value of the offset between the downlink control channel and the tracking reference signal.

The control unit 210 may determine the pseudo-collocation relationship corresponding to the aperiodic tracking reference signal based on the offset value between the downlink control channel and the aperiodic tracking reference signal.

The control unit 210 may assume different pseudo-collocations for the aperiodic tracking reference signal when the offset value is smaller than or larger than the offset threshold value.

Different resources may be supported for a plurality of TCI states (Transmission Configuration Indication states) corresponding to the aperiodic tracking reference signal.

When the offset value is larger than the offset threshold value, the control unit 210 may control the reception of the downlink channel by assuming a pseudo-collocation relationship corresponding to the aperiodic tracking reference signal.

(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 physically or logically connected device, or directly or indirectly (for example, two or more physically or logically separated devices). , 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 (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing each is not particularly limited.

For example, the base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 9 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 the present disclosure, the terms of devices, circuits, devices, sections, units, etc. 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 a plurality of 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.

The 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 peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and 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 110 (210) 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, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EPROM), a Random Access Memory (RAM), or any 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 (Compact Disc ROM (CD-ROM)), a digital versatile disc, etc. 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. May be configured by. 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. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It may be configured to include. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).

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, a Light Emitting Diode (LED) 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 the 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 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. 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 can also be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (Component Carrier (CC)) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The wireless 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. The numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration. , A specific filtering process performed by the transmitter / receiver 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 (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) 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. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in time units 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.

The wireless frame, subframe, slot, mini slot and symbol all represent the time unit when transmitting a signal. 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 called TTI, a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. 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 mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) 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 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or 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 (Resource Block (RB)) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous 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.

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

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

Further, the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)). 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) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be 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 UL BWP (BWP for UL) and DL BWP (BWP for DL). 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".

Note that the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols 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 within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations 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, etc. in this 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, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting in any way. ..

The information, signals, etc. described in this 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 may be voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

In addition, information, signals, etc. 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, etc. may be stored in a specific location (for example, 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 other devices.

The notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.

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

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

In addition, software, instructions, information, etc. 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. "Network" may mean a device (eg, a base station) included in the network.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (Quasi-Co-Location (QCL))", "Transmission Configuration Indication state (TCI state)", "space". "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", "panel" are compatible. Can be used for

In the present disclosure, "base station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission point (Transmission Point (TP))", "Reception point (Reception Point (RP))", "Transmission / reception point (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 (for example, 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 (Remote Radio)). Communication services can also be provided by Head (RRH))). 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 this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably. Can be done.

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 the base station and the mobile station may be called a transmitting device, a receiving device, a wireless 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 (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) 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 the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), 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 inter-terminal communication (for example, "side"). For example, the uplink, downlink, and the like may be read as side channels.

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 (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 the base station and one or more network nodes other than the base station (for example,). Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. In addition, 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 Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( 4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), LTE 802. 20, Ultra-WideBand (UWB), Bluetooth®, other systems that utilize suitable wireless communication methods, next-generation systems extended based on these, and the like. 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", etc. 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" used in this disclosure may include a wide variety of actions. For example, "judgment (decision)" means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

Also, "judgment (decision)" means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as "judgment (decision)" of "accessing" (for example, accessing data in memory).

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

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

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection 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 that the nouns following these articles are in the plural.

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 a modified 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)

1. A receiver that receives the downlink control channel used to transmit downlink control information that triggers a reference signal for aperiodic tracking, and a receiver.
   A terminal having a control unit that determines a pseudo-collocation relationship corresponding to the aperiodic tracking reference signal based on an offset value between the downlink control channel and the aperiodic tracking reference signal.
2. It further has a transmitter that transmits information about an offset threshold between the downlink control channel and the tracking reference signal.
   The terminal according to claim 1, wherein the control unit assumes different pseudo-collocations with respect to the aperiodic tracking reference signal when the offset value is smaller than or larger than the offset threshold value. ..
3. The terminal according to claim 1 or 2, wherein different resources are supported for a plurality of TCI states (Transmission Configuration Indication states) corresponding to the aperiodic tracking reference signal.
4. The control unit is characterized in that when the offset value is larger than the threshold value of the offset, the reception of the downlink channel is controlled by utilizing the pseudo collocation relationship corresponding to the reference signal for aperiodic tracking. Or the terminal according to claim 2.
5. The terminal according to any one of claims 1 to 4, wherein the receiving unit receives information regarding the correspondence between the resource of the aperiodic tracking reference signal and the TCI state.
6. The process of receiving the downlink control channel used for transmitting the downlink control information that triggers the reference signal for aperiodic tracking, and
   A wireless communication method comprising: a step of determining a pseudo collocation relationship corresponding to the aperiodic tracking reference signal based on an offset value between the downlink control channel and the aperiodic tracking reference signal. ..

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