WO2021090451A1 - Terminal and wireless communication method - Google Patents

Abstract

A terminal according to an aspect of the present disclosure is characterized by comprising: a control unit that, if the number of specified Phase Tracking Reference Signal (PTRS) ports is different from the number of designated Transmission Configuration Indication (TCI) states to be applied to multiple Physical Downlink Shared Channels (PDSCHs) or from the number of default TCI states to be applied to the multiple PDSCHs, then determines associations between the PTRS ports related to the multiple PDSCHs and DeModulation Reference Signal (DMRS) ports related to the multiple PDSCHs; and a reception unit that receives the multiple PDSCHs on the basis of a piece of downlink control information. According to an aspect of the present disclosure, communications can be suitably implemented even in a case of using multi-panel/TRP.

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 future wireless communication systems (eg, NR), user terminals (user terminals, User Equipment (UE)) will control transmission / reception processing based on information about pseudo-collocation (Quasi-Co-Location (QCL)). Is being considered.

Also, in NR, it is considered that one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) transmit / receive to / from the UE using one or more panels (multi-panel). Has been done.

By the way, Rel. 16 NR is considering supporting two Phase Tracking Reference Signal (PTRS) ports for single PDCCH-based multi-panel / TRP transmission. In the case where the UE has two PTRS ports configured (configured) and two TCI states are indicated (indicated), the QCL association between the PTRS port and the DeModulation Reference Signal (DMRS) port. Has already been considered.

However, other cases, such as a case where the UE is set up with one PTRS port and two TCI states are indicated, a case where the UE is set up with two PTRS ports and one TCI state is indicated, and the like. As for, the association between the PTRS port and the DMRS port has not yet been examined. If these are not clearly defined, spatial diversity gain, high-rank transmission, etc. when using multi-panel / TRP cannot be preferably realized, and an increase in communication throughput may be suppressed.

Therefore, one of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of preferably performing communication even when using a multi-panel / TRP.

The terminal according to one aspect of the present disclosure is instructed to apply to the set number of Phase Tracking Reference Signal (PTRS) ports and the multi-downlink shared channel (PDSCH). When the number of transmission setting instruction states (Transmission Configuration Indication state (TCI state)) or the number of default TCI states applied to the multi-PDSCH are different, the PTRS port for the multi-PDSCH and the demodulation for the multi-PDSCH It is characterized by having a control unit for determining the association with a reference signal (DeModulation Reference Signal (DMRS)) port, and a receiving unit for receiving the multi-PDSCH based on one downlink control information.

According to one aspect of the present disclosure, communication can be preferably performed even when a multi-panel / TRP is used.

FIG. 1 is a diagram showing an example of QCL assumption of the DMRS port of PDSCH. FIG. 2A-2D is a diagram showing an example of a multi-TRP scenario. FIG. 3 is a diagram showing an example of the association between the PTRS port and the DMRS port according to the first embodiment. FIG. 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 5 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 6 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 7 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 NR, the UE may refer to at least one of a signal and a channel (denoted as signal / channel) based on the Transmission Configuration Indication state (TCI state). In the present disclosure, “A / B”. Similarly, the reception process (for example, at least one of reception, demapping, demodulation, and decoding) and the transmission process (for example, transmission, mapping, precoding) of "at least one of A and B" may be read as. , Modulation, at least one of 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 colocation (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 on a channel-by-channel or signal-by-signal basis.

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, Doppler shift, Doppler spread, and 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 (may be referred to as QCL parameters) are shown below:
QCL Type A: Doppler shift, Doppler spread, average delay and delay spread,
・ QCL type B: Doppler shift and Doppler spread,
-QCL type C: Doppler shift and average delay,
-QCL type D: Spatial reception parameter.

Types A to C may correspond to QCL information related to synchronization processing of at least one of time and frequency, and type D may correspond to QCL information related to beam control.

The UE may assume that a given control resource set (Control Resource Set (CORESET)), channel or reference signal 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 (or a reference signal for the channel (Reference Signal (RS))) and another signal (for example, another downlink reference signal (Downlink Reference Signal (DL-RS))). It may be information about QCL with. 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 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 Channel (PUSCH)). )), It may be at least one of the uplink control channel (Physical Uplink Control Channel (PUCCH)).

The 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 DMRS antenna port associated with the PDCCH) and the QCL with a given DL-RS may be referred to as the TCI state for the PDCCH and the like.

The UE may determine the TCI state for the UE-specific PDCCH (CORESET) based on the upper layer signaling.

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. The broadcast information may be, 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), or the like.

For example, for the UE, one or more (K) TCI states may be set by RRC signaling (ControlResourceSet information element) for each CORESET. In addition, the UE may activate one or more TCI states for each CORESET using MAC CE. The MAC CE may be called a TCI state indicating MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH. 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 DL-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 downlink control information (DCI: Downlink Control Information) used for PDSCH scheduling may include a predetermined field indicating the TCI state for the PDSCH (for example, it may be called a TCI field, a TCI state field, or the like). .. 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 present) (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.

If the DCI contains an x-bit (eg, x = 3) TCI field, the base station will send up to 2 ^x (eg, 8 if x = 3) TCI states to the UE using higher layer signaling. It may be set in advance. The value of the TCI field in the DCI (TCI field value) may indicate one of the TCI states preset by 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 UE-specific PDSCH TCI state activation / deactivation MAC CE (TCI States Activation / Deactivation for UE-specific PDSCH MAC CE). The value of the TCI field in DCI may indicate one of the TCI states activated by MAC CE.

The MAC CE is used to specify the TCI state to be mapped to the code point of the TCI field of DCI among the TCI state IDs (TCI state IDs) set by RRC signaling, and to activate the TCI state. The activated TCI states may be mapped in ascending or descending order of the TCI state IDs from 0 to 2 ^x -1 code point values in the TCI field (eg, 7 if x = 3).

If the slot for transmitting HARQ-ACK (Hybrid Automatic Repeat reQuest ACK knowledge) for the PDSCH that provided the MAC CE is set to n, the activation / deactivation based on the MAC CE (TCI field in the DCI) (Mapping between and TCI state) may be applied from slot n + 3 * (number of slots in subframe) + 1. That is, in slot n + 3 * (the number of slots in the subframe) + 1, updating the code point of the TCI field based on the MAC CE may be effective.

If the TCI presence information is set to "enabled", the TCI field in the DCI in the component carrier (CC) that schedules (PDSCH) will be in the activated TCI state in the scheduled CC or DL BWP. And if the PDSCH is scheduled in DCI format 1-11, the UE uses a TCI that has a DCI and follows the value of the TCI field in the detected PDCCH to determine the QCL of the PDSCH antenna port. May be good.

If the time offset between the reception of the DL DCI and the reception of the PDSCH corresponding to the DCI is greater than or equal to a predetermined threshold, the UE will perform a TCI regarding the QCL type parameter provided by the TCI state indicated by the DCI. The RS in the state and the DMRS port of the PDSCH of the serving cell are QCL ("the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS (s) in the TCI state with respect to the QCL type parameter". (s) given by the dedicated TCI state ”) may be assumed.

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

In addition, the above thresholds are "Threshold", "Threshold for offset between a DCI indicating a TCI state and a PDSCH scheduled by the DCI", "Threshold-Sched-Offset", "timeDurationForQCL", schedule offset threshold, scheduling offset threshold, It may be called a QCL time length, or the like.

The scheduling offset threshold may be based on the UE capability, for example, the delay in decoding the PDCCH and switching the beam. The scheduling offset threshold information may be set from the base station using higher layer signaling, or may be transmitted from the UE to the base station.

If the scheduling offset is greater than the scheduling offset threshold, the UE may assume that the DMRS port of the PDSCH is an RS and a QCL for the QCL type parameter given by the TCI state indicated by the DCI.

When the scheduling offset is less than the scheduling offset threshold, the UE has one or more control resource sets (CORESET: Control Resource Set) set in the UE in the active BWP (Bandwidth Part) of the serving cell. , Latest) PDCCH corresponding to the minimum CORESET-ID in the slot RS in the TCI state regarding the QCL parameter used for the QCL instruction, and the DMRS port of the PDSCH of the serving cell is the QCL (the DM-RS ports of PDSCH). of a serving cell are quasi co-located with the RS (s) in the TCI state with respect to the QCL parameter (s) used for PDCCH quasi co-location indication of the lowest CORESET-ID in the latest slot in which It may be assumed that more CORESETs within the active BWP of the serving cell are configured for the UE).

For example, the UE may assume that the DMRS port of the PDSCH 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 schedules the PDSCH.

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

FIG. 1 is a diagram showing an example of QCL assumption of the DMRS port of PDSCH. In this example, the scheduling offset is smaller than the scheduling offset threshold. Therefore, the UE may assume that the DMRS port of the PDSCH is an RS (eg, DMRS for PDCCH) and a QCL in the TCI state for PDCCH corresponding to the smallest CORESET-ID in the latest slot.

If the UE is configured with a single slot PDSCH, the indicated TCI state may be based on the activated TCI state in the slot with the scheduled PDSCH. If the UE is configured with a multi-slot PDSCH, the indicated TCI state may be based on the activated TCI state in the first slot with the scheduled PDSCH, and the UE may span the slot with the scheduled PDSCH. You may expect them to be the same.

If the UE is configured with a CORESET associated with a search space set for cross-carrier scheduling, the UE will set the TCI presence information to "valid" for that CORESET and for the serving cell scheduled by the search space set. If at least one of the TCI states set in is containing a QCL type D, the UE may assume that the time offset between the detected PDCCH and the PDSCH corresponding to that PDCCH is greater than or equal to the threshold. Good.

(Multi TRP)
In NR, it is considered that one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) perform DL transmission to the UE using one or more panels (multi-panel). Has been done. It is also being considered that the UE transmits UL to one or more TRPs.

Note that the plurality of TRPs may correspond to the same cell identifier (cell Identifier (ID)) or may correspond to different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

FIG. 2A-2D is a diagram showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP is capable of transmitting four different beams, but is not limited to this.

FIG. 2A shows an example of a case (which may be called single mode, single TRP, etc.) in which only one TRP (TRP1 in this example) of the multi-TRPs transmits to the UE. In this case, the TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

FIG. 2B shows a case where only one TRP (TRP1 in this example) of the multi-TRP transmits a control signal to the UE, and the multi-TRP transmits a data signal (may be called a single master mode). An example is shown. The UE receives each PDSCH transmitted from the multi-TRP based on one downlink control information (Downlink Control Information (DCI)).

FIG. 2C shows an example of a case (which may be called a master-slave mode) in which each of the multi-TRPs transmits a part of a control signal to the UE and the multi-TRP transmits a data signal. Part 1 of the control signal (DCI) may be transmitted in TRP1, and part 2 of the control signal (DCI) may be transmitted in TRP2. Part 2 of the control signal may depend on Part 1. The UE receives each PDSCH transmitted from the multi-TRP based on these DCI parts.

FIG. 2D shows an example of a case (which may be called a multi-master mode) in which each of the multi-TRPs transmits a separate control signal to the UE and the multi-TRP transmits a data signal. The first control signal (DCI) may be transmitted in TRP1, and the second control signal (DCI) may be transmitted in TRP2. The UE receives each PDSCH transmitted from the multi-TRP based on these DCIs.

When a plurality of PDSCHs (which may be referred to as multiple PDSCHs) from a multi-TRP as shown in FIG. 2B are scheduled using one DCI, the DCIs are referred to as a single DCI (single PDCCH). It may be. Further, when a plurality of PDSCHs from a multi-TRP as shown in FIG. 2D are scheduled by using a plurality of DCIs, the plurality of DCIs may be referred to as a multi-DCI (multi-PDCCH (multiple PDCCH)). ..

Different code words (Code Word (CW)) and different layers may be transmitted from each TRP of the multi-TRP. Non-Coherent Joint Transmission (NCJT) is being studied as a form of multi-TRP transmission.

In NCJT, for example, TRP1 modulates and maps the first codeword, layer-maps, and transmits the first PDSCH to the first number of layers (for example, two layers) using the first precoding. In addition, TRP2 modulates and maps the second codeword, layer-maps the second number of layers (for example, two layers), and transmits the second PDSCH using the second precoding.

It should be noted that the plurality of PDSCHs (multi-PDSCHs) to be NCJT may be defined as partially or completely overlapping with respect to at least one of the time and frequency domains. That is, at least one of the time and frequency resources of the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap.

These first PDSCH and second PDSCH may be assumed to be not quasi-co-located in a pseudo-collocation (Quasi-Co-Location (QCL)) relationship. The reception of the multi-PDSCH may be read as the simultaneous reception of PDSCHs that are not of a predetermined QCL type (for example, QCL type D).

If the TCI state corresponding to the value of the TCI field (which may be referred to as the TCI code point) indicated by the single DCI described above is one TCI state (for one panel), the UE will send a single TRP with a single PDCCH. It may be assumed that it has been applied. In other words, if the TCI state corresponding to the smallest TCI code point is one TCI state, the UE will be among the multi-PDSCHs, even if the single PDCCH schedules the reception of the multi-PDSCH. Only one may be received based on the one TCI state.

Further, when the TCI states corresponding to a certain TCI code point are two TCI states (for two panels), the UE has the UE that one of the one TCI states (for example, the first TCI state) is the first TRP (for example, the first TCI state). It may be assumed that it is applied to one of the multi-PDSCHs and the other (eg, the second TCI state) is applied to the second TRP (the other of the multi-PDSCHs).

According to such a multi-TRP scenario, more flexible transmission control using a high quality channel is possible.

(PTRS and DMRS)
By the way, in the NR, the DMRS port associated with the PTRS port is assumed to be a QCL with respect to QCL types A and D. In other words, when a PTRS port is associated with a DMRS port, it may be assumed that the PTRS port and the DMRS port are in a QCL type A and D relationship with each other.

When the UE is scheduled for one codeword, the PTRS antenna port is associated with the DMRS antenna port with the lowest index of the DMRS antenna ports assigned for the scheduled PDSCH.

If the UE is scheduled for two codewords, the PTRS antenna port will be associated with the DMRS antenna port with the lowest index of the DMRS antenna ports assigned for the higher MCS codewords. If the MCS indexes of the two codewords are the same, the PTRS antenna port is associated with the DMRS antenna port with the smallest index among the DMRS antenna ports assigned for the first code (codeword 0).

Rel. 16 NR is considering supporting two PTRS ports (first PTRS port and second PTRS port) for the single PDCCH-based multi-panel / TRP transmission shown in FIG. 2B.

In the UE, one of the two PTRS ports (eg, the first PTRS port) corresponds to the first TRP (one of the multi-PDSCHs), and the other (eg, the second PTRS port) corresponds to the second TRP (multi). It may be assumed that it corresponds to the other side of PDSCH).

The UE may be configured with two PTRS ports by RRC signaling. Also, whether or not a UE supports two PTRS ports may depend on the capabilities of the UE.

Here, when the UE is indicated by one TCI code point for two TCI states (first TCI state and second TCI state), the first and second PTRS ports are indicated, respectively. It relates to the DMRS antenna port with the smallest index among the DMRS antenna ports corresponding to the first and second TCI states.

In this way, in the case where the UE has two PTRS ports configured (configured) and two TCI states are indicated (indicated), the association between the PTRS port and the DMRS port has already been examined in the NR specifications.

However, other cases, such as the case where the UE is configured with one PTRS port and two TCI states are indicated, the case where the UE is configured with two PTRS ports and one TCI state is indicated, In the first place, in cases where the TCI status is not indicated (or it is not appropriate to use even if it is indicated), the association between the PTRS port and the DMRS port has not yet been studied. If these are not clearly defined, spatial diversity gain, high-rank transmission, etc. when using multi-panel / TRP cannot be preferably realized, and an increase in communication throughput may be suppressed.

Therefore, the present inventors have conceived an association between the PTRS port and the DMRS port, which can be used when using the multi-panel / TRP.

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, the panel, Uplink (UL) transmission entity, TRP, spatial relationship, control resource set (COntrol REsource SET (CORESET)), PDSCH, code word, base station, predetermined antenna port (for example, reference for demodulation). Signal (DeModulation Reference Signal (DMRS) port), predetermined antenna port group (for example, DMRS port group), predetermined group (for example, Code Division Multiplexing (CDM) group, predetermined reference signal group, CORESET group) 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.

Further, in the present disclosure, NCJT, NCJT using multi-TRP, multi-PDSCH using NCJT, multi-PDSCH, a plurality of PDSCHs from multi-TRP, and the like may be read as each other. The multi-PDSCH may mean a plurality of PDSCHs in which at least a part (for example, one symbol) of the time resource overlaps, or a plurality of PDSCHs in which all the time resources (for example, all symbols) overlap. May mean. That is, the UE may receive the multi-PDSCH at overlapping timings, or may receive the multi-PDSCH at the same time.

Further, in the present disclosure, setting n PTRS ports by a UE (for example, n = 1, 2, ...) Means that the UE is set to use n PTRS ports. May be good.

Also, in the present disclosure, the association of PTRS ports and DMRS ports may mean that these ports are assumed to be QCL for a particular QCL type (eg, types A and D).

Further, in the present disclosure, "TCI state ID = # X (X is an integer) TCI state" may be read as "TCI state # X", "TCI # X" and the like. Further, "antenna port" and "port" may be read as each other.

(Wireless communication method)
<First Embodiment>
The first embodiment relates to associating a PTRS port with a DMRS port when the UE is configured with one PTRS port and two TCI states (first TCI state and second TCI state) are indicated.

A UE with one PTRS port configured and two TCI states indicated may determine that the one PTRS port is associated with at least one DMRS port in (1) to (3) below:
(1) The DMRS port with the smallest index among the DMRS ports corresponding to the indicated first TCI state,
(2) Of the two indicated TCI states, the DMRS port with the smallest index among the DMRS ports corresponding to the TCI state of the smallest TCI state ID,
(3) The DMRS port with the smallest index among the DMRS ports corresponding to the indicated TCI state for higher layers (which may be read as rank, number of layers, etc.).

If the ranks of the two indicated TCI states are the same, the UE may determine that the one PTRS port is related to the DMRS port of (1) or (2).

Further, in the present disclosure, "specific", "minimum", "maximum", "smallest to Mth" (M is an integer), and "largest to Mth" are read as each other. May be good. The "TCI code point" may be read as "the code point of the TCI field", "the value of the TCI field", and the like.

Further, in the present disclosure, "first" may be read as "first", "first in one TCI state set", etc., and "second" may be read as "last", "last", "first", etc. They may be read as "last in one TCI state set" and so on.

FIG. 3 is a diagram showing an example of the association between the PTRS port and the DMRS port according to the first embodiment. In this example, the UE is configured with one PTRS port, and the indicated TCI state is the TCI state set of {TCI # 3, TCI # 1}.

For example, in the case of (1) above, the UE may determine that one configured PTRS port is associated with the DMRS port having the smallest index among the DMRS ports corresponding to TCI # 3.

In the case of (2) above, the UE may determine that one configured PTRS port is associated with the DMRS port having the smallest index among the DMRS ports corresponding to TCI # 1.

According to the first embodiment described above, even if the set number of PTRS ports and the number of indicated TCI states applied to the multi-PDSCH are different, the PTRS ports related to the multi-PDSCH and the PTRS ports. , The association with the DMRS port related to the multi-PDSCH can be preferably determined.

<Second embodiment>
A second embodiment relates to associating a PTRS port with a DMRS port when the UE is configured with two PTRS ports (a first PTRS port and a second PTRS port) and one TCI state is indicated.

The UE to which two PTRS ports are set may determine the number of PTRS ports that actually receive (or actually try to receive) among the two PTRS ports.

For example, the UE may determine which PTRS port it actually receives based on at least one of (A) and (B) below:
(A) Number of indicated TCI states,
(B) The number of CDM groups associated with the indicated TCI status.

In the case of the above (A), when one TCI state is instructed, the UE in which two PTRS ports are set has the smallest index DMRS port among the DMRS ports corresponding to the instructed one TCI state. The PTRS port associated with (eg, the first PTRS port) may be received, or the other configured PTRS port (eg, the second PTRS port) may not be received.

Further, in the case of the above (A), when the UE in which the two PTRS ports are set is instructed to use the two TCI states, the first and second PTRS ports are instructed to be the first and first, respectively. Each PTRS port may be received, assuming that it is associated with the DMRS antenna port with the smallest index among the DMRS ports corresponding to the TCI state of 2.

In the case of the above (B), when the UE in which the two PTRS ports are set is instructed to have one TCI state corresponding to one CDM group, the DMRS corresponding to the instructed CDM group in the one TCI state is instructed. The PTRS port associated with the DMRS antenna port with the lowest index among the ports (eg, the first PTRS port) may be received, and other configured PTRS ports (eg, the second PTRS port) may be received. You don't have to.

Further, in the case of the above (B), when the UE in which the two PTRS ports are set is instructed to have one TCI state corresponding to the two CDM groups (the first CDM group and the second CDM group), Assuming that the first and second PTRS ports are associated with the smallest index DMRS port among the DMRS ports corresponding to the first CDM group and the second CDM group, respectively, each PTRS port is assigned. You may receive it.

According to the second embodiment described above, even if the set number of PTRS ports and the number of indicated TCI states applied to the multi-PDSCH are different, the PTRS ports related to the multi-PDSCH and the PTRS ports. , The association with the DMRS port related to the multi-PDSCH can be preferably determined.

<Third embodiment>
A third embodiment relates to a PTRS transmitted for the PDSCH when the time offset (scheduling offset) between the reception of the DL DCI and the reception of the PDSCH corresponding to the DCI is less than the scheduling offset threshold. The PTRS in the third embodiment may be read as the PTRS transmitted for the PDSCH when the scheduling offset is smaller than the scheduling offset threshold.

The scheduling offset may be common regardless of TRP, or may be different for each TRP. Further, the scheduling offset threshold value may be common regardless of TRP, or may be different for each TRP.

Here, the TCI state or QCL (QCL assumption) that the UE assumes to be applied to the PDSCH (DMRS of the PDSCH) when the scheduling offset is smaller than the scheduling offset threshold value may be called the default TCI state. The default TCI state may be read as the default QCL, the default QCL assumption, and the like. Hereinafter, this TCI state or QCL (QCL assumption) is referred to as a default TCI state, but the name is not limited to this.

The definition of the default TCI state is not limited to this. The default TCI state may be, for example, a TCI state assumed when the TCI state / QCL specified by the DCI is not available for a certain channel / signal (for example, PDSCH), or the TCI state / QCL is specified (for example). Alternatively, it may be in the TCI state assumed when it is not set).

The UE may determine one or both default TCI states (one or two default TCI states) of a multi-PDSCH scheduled using a single PDCCH based on at least one of the following:
(A) Rel. Same rule as 15 NR (QCL assumption of CORESET related to minimum CORESET-ID in the latest slot),
(B) QCL assumption of the above single PDCCH,
(C) Of the TCI states corresponding to the TCI code points specified by the TCI field of the single PDCCH, the TCI state of the TCI state ID for the corresponding panel (in other words, the TCI state of the corresponding panel indicated by the TCI field). ,
(D) The TCI state corresponding to a particular TCI code point that may be specified by the TCI field of the single PDCCH.
(E) Of all the TCI states corresponding to the code points that can be specified by the TCI field of the single PDCCH, the TCI state of the specific TCI state ID for the corresponding panel.

The "specific TCI code point" in (d) above may be, for example, the smallest TCI code point among the TCI code points indicating an arbitrary number of TCI states (that is, among all TCI code points). Alternatively, it may be the smallest TCI code point among the TCI code points indicating the two TCI states.

The Xth (X is an integer) code point is the Xth code point activated by MAC CE (for example, TCI state activation / deactivation MAC CE for UE-specific PDSCH) for PDSCH (or multi-PDSCH). It may be read in the TCI state, or it may be read in the TCI state for the Xth PDSCH set by RRC signaling.

"All TCI states corresponding to the code points that can be specified" in (e) above may mean all TCI states activated by MAC CE, or all for PDSCH set by RRC signaling. It may be read as the TCI state of.

When a UE determines n default TCI states in relation to the multi-PDSCH, the UE may be said to have n default TCI states. If there are n TCI states corresponding to at least one of the above (a) to (e), it may mean that the number of default TCI states possessed by the UE is n.

In a third embodiment, a UE having two PTRS ports configured and having two default TCI states has the first and second PTRS ports corresponding to the first and second default TCI states, respectively. It may be determined that it is related to the DMRS antenna port having the smallest index among the DMRS antenna ports to be used.

A UE configured with one PTRS port and having two default TCI states will have that one PTRS port be a specific DMRS port according to the content of the indicated TCI state in the first embodiment being read as the default TCI state. You may decide that it is related to.

In a UE in which two PTRS ports are set and one default TCI state is set, the two PTRS ports each have a specific DMRS according to the contents of reading the indicated TCI state in the second embodiment as the default TCI state. It may be determined that it is related to the port.

According to the third embodiment described above, even if the number of set PTRS ports and the number of default TCI states applied to the multi-PDSCH are the same or different, the PTRS ports related to the multi-PDSCH and the PTRS ports are used. , The association with the DMRS port related to the multi-PDSCH can be preferably determined.

<Other Embodiments>
It should be noted that the UE may assume that the case where one PTRS port is set and two TCI states are indicated as described in the first embodiment is an error case. In other words, a UE configured with one PTRS may not expect two TCI states to be indicated.

Further, the UE may assume that the case where the two PTRS ports as described in the second embodiment are set and one TCI state is indicated is an error case. In other words, a UE configured with two PTRSs may not expect two TCI states to be indicated.

Further, each of the above-described embodiments shows the relationship between the DL PTRS port and the DL DMRS port, but the present invention is not limited to this. In each of the above embodiments, PTRS may be read as UL PTRS, for example, and DMRS may be read as UL DMRS. Further, one or both of PTRS and DMRS may be read by other reference signals.

Although the example of the single PDCCH is shown in the above-described embodiment, each embodiment of the present disclosure may be applied to the multi-PDCCH.

The DMRS port group of the present disclosure may include at least one of the DMRS port group of PDSCH, the DMRS port group of PDCCH, the DMRS port group of PBCH, and the DMRS port group of other channels.

(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. 4 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 Technologies (RATs) (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 base station (gNB) of NR is MN, and the base station (eNB) of LTE (E-UTRA) 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 higher-level 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. Further, the Master Information Block (MIB) may be transmitted by the 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 to detect 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, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (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. 5 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 this example mainly shows the functional blocks of the feature portion in the present embodiment, 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, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110. RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), and the like 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 signal in the radio frequency band 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, decoding, 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 / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 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 transmission unit and the reception 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 one or both of a plurality of downlink shared channels (Physical Downlink Shared Channel (PDSCH)) (multi-PDSCH) scheduled based on one downlink control information (single PDCCH). May be good.

(User terminal)
FIG. 6 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. When the transform precoding is enabled for a channel (for example, PUSCH), the transmission / reception unit 220 (transmission processing unit 2211) transmits the channel using the DFT-s-OFDM waveform. 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. on the baseband signal to the radio frequency band, 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 transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.

The control unit 210 applies to the number of set Phase Tracking Reference Signal (PTRS) ports and a plurality of downlink shared channels (Physical Downlink Shared Channel (PDSCH)) (multi-PDSCH). When the number of instructed transmission setting instruction states (Transmission Configuration Indication state (TCI state)) or the number of default TCI states applied to the multi-PDSCH is different, the PTRS port related to the multi-PDSCH and the multi-PDSCH are related. The association with the demodulation reference signal (DeModulation Reference Signal (DMRS)) port may be determined.

The transmission / reception unit 220 may receive the multi-PDSCH based on one downlink control information (single PDCCH).

When the number of set PTRS ports is 1, and the number of the indicated TCI states or the number of the default TCI states is 2, the control unit 210 indicates the one PTRS port. It may be determined that it is related to the DMRS port having the smallest index among the DMRS ports corresponding to the TCI state of 1 (see (1) of the first embodiment).

The control unit 210 enters the indicated TCI state for a higher rank when the number of configured PTRS ports is 1 and the number of the indicated TCI states or the number of the default TCI states is 2. It may be determined that it is related to the DMRS port having the smallest index among the corresponding DMRS ports (see (3) of the first embodiment).

When the number of set PTRS ports is 2, the control unit 210 determines the number of PTRS ports actually received based on the number of the indicated TCI states or the number of the default TCI states. It may be (see the second embodiment).

When the number of set PTRS ports is 2, the control unit 210 determines the number of the indicated TCI states or the number of code division multiplexing (CDM) groups related to the default TCI states. Based on this, the number of PTRS ports actually received may be determined (see (B) of the second embodiment).

(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 (transmitting unit), a transmitter (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, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 7 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 this 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.

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, a register, 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. 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. 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)). 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. 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. 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 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, minislot 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, etc.) 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 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.

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.

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 other methods. 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, 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, etc. may be transmitted and received via a transmission medium. For example, a website where 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. The "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 (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 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, 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 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, an uplink channel, a downlink 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 (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. 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 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".

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.

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 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 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)

1. The number of Phase Tracking Reference Signal (PTRS) ports and the Transmission Configuration Indication state applied to the Physical Downlink Shared Channel (PDSCH). (TCI state)) or the number of default TCI states applied to the multi-PDSCH, the PTRS port for the multi-PDSCH and the demodulation reference signal (DMRS) for the multi-PDSCH. A control unit that determines the association between the port and
   A terminal having a receiving unit that receives the multi-PDSCH based on one downlink control information.
2. When the number of set PTRS ports is 1 and the number of the indicated TCI states or the number of the default TCI states is 2, the control unit is designated as the one PTRS port. The terminal according to claim 1, wherein it is determined that the DMRS port has the smallest index among the DMRS ports corresponding to the TCI state of 1.
3. When the number of set PTRS ports is 1 and the number of the indicated TCI states or the number of the default TCI states is 2, the control unit is set to the indicated TCI state for a higher rank. The terminal according to claim 1, wherein it is determined that the DMRS port has the smallest index among the corresponding DMRS ports.
4. When the number of set PTRS ports is 2, the control unit determines the number of PTRS ports actually received based on the number of the indicated TCI states or the number of default TCI states. The terminal according to any one of claims 1 to 3.
5. The control unit determines the number of the indicated TCI states or the number of Code Division Multiplexing (CDM) groups associated with the default TCI states when the number of configured PTRS ports is 2. The terminal according to any one of claims 1 to 3, wherein the number of PTRS ports actually received is determined based on the above.
6. The number of Phase Tracking Reference Signal (PTRS) ports and the Transmission Configuration Indication state applied to the Physical Downlink Shared Channel (PDSCH). (TCI state)) or the number of default TCI states applied to the multi-PDSCH, the PTRS port for the multi-PDSCH and the demodulation reference signal (DMRS) for the multi-PDSCH. Steps to determine the association with the port,
   A terminal wireless communication method comprising a step of receiving the multi-PDSCH based on one downlink control information.

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