CN114651400A - Terminal and wireless communication method - Google Patents

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit configured to determine an association between a PTRS port related to a multi-PDSCH and a demodulation Reference Signal (DMRS)) port related to the multi-PDSCH if the number of set Phase Tracking Reference Signal (PTRS) ports is different from the number of Transmission Configuration Indication states (TCI states) indicated to be applied to the multi-Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) or the number of default TCI states applied to the multi-PDSCH; and a receiving unit that receives the multiple PDSCHs based on one downlink control information. According to an aspect of the present disclosure, communication can be appropriately performed even in the case of using a multi-panel/TRP.

Description

Terminal and wireless communication method

Technical Field

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

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further increasing the capacity and the height of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel.))8 and 9).

Successor systems to LTE, such as 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP rel.15 and beyond, are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 13 GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

Research is underway: in future wireless communication systems (e.g., NR), a User terminal (User terminal, User Equipment (UE)) controls transmission/reception processing based on information on Quasi-Co-location (qcl).

Further, in NR, studies are being made: one or more Transmission/Reception points (TRPs) (multiple TRPs) perform Transmission and Reception with the UE using one or more panels (multi-panel).

However, studies are underway in rel.1698r: for single PDCCH based multi-panel/TRP transmission, two Phase Tracking Reference Signal (PTRS) ports are supported. With respect to the case where the UE is set (configured) with two PTRS ports and indicated (indicated) with two TCI states, studies have been made: association of the PTRS port and QCL to the DeModulation Reference Signal (DMRS) port.

However, in other cases, for example, a case where the UE is set with one PTRS port and indicated with two TCL states, a case where the UE is set with two PTRS ports and indicated with one TCL state, and the like, no study has been made on the association of the PTRS port and the DMRS port. If these are not clearly defined, spatial diversity gain, high rank transmission, and the like cannot be appropriately realized in the case of using multi-panel/TRP, and an increase in communication throughput may be suppressed.

Accordingly, it is an object of the present disclosure to provide a user terminal and a wireless communication method capable of appropriately performing communication even in the case of using a multi-panel/TRP.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a control unit configured to determine an association between a PTRS port related to a multi-PDSCH and a DeModulation Reference Signal (DMRS)) port related to the multi-PDSCH, when the number of set Phase Tracking Reference (PRTS) ports is different from the number of Transmission Configuration Indication states (TCI states) indicated to be applied to a multi-Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) or the number of default TCI states applied to the multi-PDSCH; and a receiving unit that receives the multiple PDSCHs based on one downlink control signal.

Effects of the invention

According to an aspect of the present disclosure, communication can be appropriately performed even in the case of using a multi-panel/TRP.

Drawings

Fig. 1 is a diagram illustrating an example of QCL assumption of DMRS ports of PDSCH.

Fig. 2A to 2D are diagrams showing an example of a multi-TRP scenario.

Fig. 3 is a diagram illustrating an example of association between a PTRS port and a DMRS port according to the first embodiment.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 5 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 6 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 7 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(TCI, spatial relationship, QCL)

In NR, studies are underway: in the present disclosure, "a/B" may be similarly replaced with "at least one of a and B" in the present disclosure, and control is performed on reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and Transmission processing (for example, at least one of Transmission, mapping, precoding, modulation, and coding) of at least one of a signal and a channel (may also be referred to as a signal/channel) based on a Transmission Configuration Indication state (TCI state).

The TCI status may also indicate the status of the signal/channel applied to the downlink. A state corresponding to a TCI state of a signal/channel applied to an uplink may also be expressed as a spatial relationship (spatial relationship).

The TCI state is Information related to Quasi-Co-location (qcl) of a signal/channel, and may also be referred to as Spatial reception parameter(s), Spatial Relationship Information (SRI), and the like. The TCI status may also be set to the UE per channel or per signal.

QCL is an indicator representing the statistical nature of a signal/channel. For example, it may also mean that, in a case where a certain signal/channel and another signal/channel are in a QCL relationship, it can be assumed that at least one of Doppler shift (Doppler shift), Doppler spread (Doppler spread), average delay (average delay), delay spread (delay spread), and spatial parameter (spatial Rx parameter) (for example, spatial Rx parameter)) is the same between these different signals/channels (at least one of these is a QCL).

The spatial reception parameters may correspond to reception beams (for example, reception analog beams) of the UE, or the beams may be determined based on the spatial QCL. QCL (or at least one element of QCL) in the present disclosure may also be replaced with sQCL (spatial QCL)).

QCLs may also be specified in multiple types (QCL types). For example, 4 QCL types a-D may be set, and in the 4 QCL types a-D, the same parameter (or parameter set) can be assumed to be different, and the parameter (which may also be referred to as a QCL parameter) is represented as follows:

QCL type A: doppler shift, doppler spread, mean delay, and delay spread,

QCL type B: the doppler shift and the doppler spread are then combined,

QCL type C: the doppler shift and the average delay are then measured,

QCL type D: the space receives the parameters.

The types a to C may correspond to QCL information associated with synchronization processing of at least one of time and frequency, and the type D may correspond to QCL information associated with beam steering.

The case where the UE assumes a specific Control Resource Set (CORESET), channel or reference signal to be in a specific QCL (e.g., QCL type D) relationship with another CORESET, channel or reference signal may also be referred to as QCL assumption (QCL assumption).

The UE may also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI status or QCL assumption for the signal/channel.

The TCI state may be information on QCL of a channel to be a target (or a Reference Signal (RS) for the channel) and another Signal (e.g., another Downlink Reference Signal (DL-RS))). The TCI status may also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

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

MAC signaling may also use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), and the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (RMSI), or Other System Information (OSI).

The physical layer signaling may also be, for example, Downlink Control Information (DCI).

The Channel to which the TCI state is set (designated) may be at least one of a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))), an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), and an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))).

The RS (DL-RS) that has a QCL relationship with the Channel may be at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), and a measurement Reference Signal (Sounding Reference Signal (SRS)). Alternatively, the DL-RS may also be a CSI-RS (also referred to as Tracking Reference Signal (TRS)) used for Tracking or a Reference Signal (also referred to as QRS) used for QCL detection.

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

The information element of the TCI state (the "TCI-state IE" of the RRC) set by the higher layer signaling may also contain one or more QCL information ("QCL-Info"). QCL information may also include: at least one of information (DL-RS relation information) relating to DL-RS which becomes a QCL relation and information (QCL type information) indicating a QCL type. The DL-RS relation information may also include information of an index of the DL-RS (e.g., SSB index, Non-Zero-power CSI-RS (nzp) CSI-RS) resource id (identifier), an index of a cell where the RS is located, an index of a Bandwidth Part (BWP) where the RS is located, and the like.

< TCI State for PDCCH >

Information related to QCLs of the PDCCH (or DMRS antenna ports associated with the PDCCH) and a specific DL-RS may also be referred to as TCI status for the PDCCH, and the like.

The UE may also determine the TCI status for the UE-specific pdcch (coreset) based on higher layer signaling.

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

MAC signaling may also use, for example, a MAC Control Element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (RMSI), or the like.

For example, for the UE, one or more (K) TCI states may be set for each CORESET through RRC signaling (controlresourceseset information element). Further, for each CORESET, the UE may also use the MAC CE to activate its respective one or more TCI states. The MAC CE may also be referred to as a TCI status Indication MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH. The UE may also perform monitoring of the CORESET based on the activated TCI state corresponding to the CORESET.

< TCI State for PDSCH >

The information related to QCLs of the PDSCH (or DMRS antenna ports associated with the PDSCH) and the specific DL-RS may also be referred to as TCI status for the PDSCH, etc.

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

Downlink Control Information (DCI) used for scheduling the PDSCH may include a specific field (may be referred to as, for example, a TCI field, a TCI status field, or the like) indicating a TCI status for the PDSCH. The DCI may also be used for scheduling PDSCH of one cell, and may also be referred to as DL DCI, DL allocation, DCI format 1_0, DCI format 1_1, or the like.

Whether the TCI field is included in the DCI may be controlled by information notified from the base station to the UE. The information may be information indicating whether or not a TCI field (present or present) exists in the DCI (e.g., TCI presence information in the DCI, and higher layer parameter TCI-PresentInDCI).

This information may also be set for the UE by, for example, higher layer signaling.

When the DCI includes the TCI field of x bits (e.g., x ═ 3), the base station may set the maximum 2 in advance for the UE using higher layer signaling^x(e.g., 8 when x ═ 3) kinds of TCI states. The value of the TCI field within the DCI (TCI field value) may also indicate one of the TCI states preset by higher layer signaling.

When more than 8 kinds of TCI states are set to the UE, the TCI states of 8 kinds or less may be activated (or designated) using the MAC CE. The MAC CE may also be referred to as a TCI state Activation/Deactivation MAC CE (TCI States Activation/Deactivation for UE-specific PDSCH MAC CE) for the UE-specific PDSCH. The value of the TCI field within the DCI may also indicate one of the TCI states that is activated by the MAC CE.

The MAC CE is used to specify a TCI state mapped to a codepoint of a TCI field of DCI in a TCI state id (TCI state id) set by RRC signaling and activate the TCI state. The activated TCI status can also be mapped to the code point value of the TCI field from 0 to 2 in ascending or descending order of the TCI status ID^x-1 (e.g., 7 when x ═ 3).

If the time slot in which the UE transmits HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement) for the PDSCH to which the MAC CE is provided is set to n, activation/deactivation based on the MAC CE (mapping between the TCI field and the TCI state in the DCI) may be applied from time slot n +3 × (the number of time slots in the subframe) + 1. That is, in time slot n +3 (the number of time slots in a subframe) +1, the code point update based on the TCI field of the MAC CE may be effective.

When the TCI presence information is set to "enabled", the TCI field in the DCI in the Component Carrier (CC) that schedules the PDSCH (Component Carrier (CC)) indicates an activated TCI state in the scheduled CC or DL BWP, and when the PDSCH is scheduled according to DCI format 1_1, the UE may use the TCI according to the value of the TCI field in the PDCCH detected in the presence of DCI in order to determine the QCL of the PDSCH antenna interface.

When the time offset between the reception of DL DCI and the reception of PDSCH corresponding to the DL DCI is equal to or greater than a specific threshold, the UE may assume that: the RS in the TCI state, which is related to the QCL type parameter given by the TCI state indicated by the DCI, and the DMRS port of the PDSCH of the serving cell are QCLs ("the DM-RS ports of PDSCH of a serving cell area-located with the RS(s) in the TCI state with repeat to the QCL type parameter(s) given by the indicated TCI state").

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

Further, the above Threshold may also be referred to as "Threshold", "Threshold for indicating an Offset between DCI in a TCI state and PDSCH scheduled by DCI (Threshold for Offset between DCI indicating a TCI state and PDSCH scheduled by the DCI)", "Threshold-scheduled-Offset", "timedurationqcl", scheduling (scheduling) Offset Threshold, QCL duration, and the like.

The scheduling (scheduling) offset threshold may be based on the UE capabilities, but also on e.g. the decoding of the PDCCH and the delay involved in the beam switching. The information of the scheduling offset threshold may be set from the base station using higher layer signaling, or may be transmitted from the UE to the base station.

In case the scheduling offset is above the scheduling offset threshold, the UE may also assume: the RS of the DMRS port of PDSCH related to the QCL type parameter given by the TCI status indicated by DCI is QCL.

Furthermore, in case that the scheduling offset is smaller than the scheduling offset threshold, the UE may also assume that: the DMRS port of the RS and PDSCH of the serving cell in the TCI state is QCL for PDCCH QCL indication(s) corresponding to the smallest core-ID in the latest (latest) slot Set to the UE for more than one Control Resource Set (core: Control Resource Set) within the active bandwidth part BWP (bandwidth part) of the serving cell (the DM-RS ports of PDSCH of a viewing cell area quality-located with RS(s) in the TCI state with the QCL parameter(s) used for PDCCH side-location indication of the viewing cell area in the UE in the TCI state of the UE.

For example, the UE may also be conceived as: the DMRS port of the PDSCH and the DL-RS based on the TCI state activated for the CORESET corresponding to the minimum CORESET-ID are QCLs. The latest slot may be, for example, a slot in which DCI scheduling the PDSCH is received.

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

Fig. 1 is a diagram illustrating an example of QCL assumption of DMRS ports of PDSCH. In this example, the scheduling offset is less than the scheduling offset threshold. Thus, the UE may also assume that the DMRS port of the PDSCH and the RS in the PDCCH TCI state (e.g., DMRS for PDCCH) corresponding to the smallest CORESET-ID in the latest slot are QCLs.

In the case where the UE is set with a single-slot PDSCH, the indicated TCI state may also be based on an activated TCI state within the slot with the scheduled PDSCH. In the case where the UE is configured with the multi-slot PDSCH, the indicated TCI status may be based on the activated TCI status in the first slot with the scheduled PDSCH, or the UE may expect the indicated TCI status to be consistent in the range of the slot with the scheduled PDSCH.

When the UE is set with a CORESET associated with a search space set for cross-carrier scheduling, the UE sets the TCI presence information to "valid" for the CORESET, and when at least one TCI state set for a serving cell scheduled according to the search space set includes QCL type D, the UE may assume: the time offset between the detected PDCCH and the PDSCH corresponding to the PDCCH is above a threshold.

(multiple TRP panel)

In NR, studies are underway: one or more Transmission/receptionpoint (TRP) transmit DL to the UE using one or more panels (multi-panels). Further, studies are being made for: the UE UL transmits one or more TRPs.

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

Fig. 2A to 2D are diagrams showing an example of a multi-TRP scenario. In these examples, it is assumed that each TRP can transmit 4 different beams, but is not limited thereto.

Fig. 2A shows an example of a case (may also be referred to as a single mode, a single TRP, or the like) in which only one TRP (TRP 1 in this example) among a plurality of TRPs transmits to a UE. In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

Fig. 2B shows an example of a case (may also be referred to as a single master mode) in which only one TRP (TRP 1 in this example) among the multiple TRPs transmits a control signal to the UE and a data signal is transmitted from the multiple TRPs. The UE receives PDSCHs transmitted by the TRPs based on Downlink Control Information (DCI).

Fig. 2C shows an example of a case where a plurality of TRPs transmit a part of a control signal to a UE and a data signal is transmitted by the plurality of TRPs (may be referred to as a master-slave mode). The first part of the control signal (DCI) may also be transmitted through TRP1 and the second part of the control signal (DCI) may be transmitted through TRP 2. The second part of the control signal may also depend on the first part. The UE receives each PDSCH of the multiple TRP transmission based on the portions of the DCI.

Fig. 2D shows an example of a case where a plurality of TRPs transmit different control signals to a UE and a data signal is transmitted by the plurality of TRPs (may be referred to as a multi-master mode). The first control signal (DCI) may also be transmitted through TRP1 and the second control signal (DCI) may be transmitted through TRP 2. The UE receives the PDSCHs transmitted from the multiple TRPs based on the DCIs.

In the case where multiple PDSCHs from multiple TRPs (which may also be referred to as multiple PDSCHs) are scheduled using one DCI as in fig. 2B, the DCI may also be referred to as single DCI (single PDCCH). In addition, in the case where a plurality of PDSCHs from a plurality of TRPs are scheduled by a plurality of DCIs as in fig. 2D, these plurality of DCIs may also be referred to as a multi-DCI (multiple pdcch).

Different codewords (Code Word (CW)) and different layers may also be transmitted from each TRP of the multiple TRPs. As a way of multi-TRP Transmission, Non-Coherent Joint Transmission (NCJT) is also being studied.

In NCJT, for example, TRP1 is modulation-mapped to a first codeword and layer-mapped, so that a first number of layers (e.g., 2 layers) are transmitted a first PDSCH with a first precoding. Also, TRP2 performs modulation mapping on the second codeword, performs layer mapping, and transmits the second PDSCH with the second precoding for the second number of layers (e.g., 2 layers).

In addition, multiple PDSCHs by NCJT (multiple PDSCHs) may also be defined as partially or fully repeated with respect to at least one of the time and frequency domains. That is, at least one of time and frequency domains of the first PDSCH from the first TRP and the second PDSCH from the second TRP may be repeated.

It is also conceivable that there is no Quasi-Co-location (qcl) relationship between the first PDSCH and the second PDSCH. Reception of multiple PDSCHs may also be replaced with simultaneous reception of PDSCHs of non-specific QCL types (e.g., QCL type D).

When the TCI status corresponding to the value of the TCI field (which may also be referred to as TCI codepoint) indicated by the single DCI is one TCI status (one panel), the UE may assume: single TRP transmission is applied over single PDCCH. In other words, when the TCI state corresponding to the minimum TCI code point is one TCI state, only one of the multiple PDSCHs is received based on the one TCI state even when the UE is supposed to be scheduled for reception of the multiple PDSCHs through the single PDCCH.

Furthermore, when the TCI status corresponding to a certain TCI codepoint is two TCI statuses (two panel shares), the UE may also assume: one of the one TCI states (e.g., the first TCI state) is applicable to a first TRP (one of multiple PDSCHs), and the other (e.g., the second TCI state) is applicable to a second TRP (another of multiple PDSCHs).

According to such a multi-TRP scenario, more flexible transmission control using a high-quality channel can be performed.

(PTRS and DMRS)

However, in NR, it is conceivable that: the DMRS ports associated with the PTRS ports are QCLs for QCL types a and D. In other words, in the case where a certain PTRS port is associated with a certain DMRS port, it is conceivable that: the PTRS port and DMRS port are in QCL relationship a and D with each other.

In case that the UE is scheduled one codeword, the PTRS antenna port is associated with a DMRS antenna port of a smallest index among DMRS antenna ports allocated for the scheduled PDSCH.

In the case where the UE is scheduled with two codewords, the PTRS antenna port is associated with the DMRS antenna port with the smallest index among the DMRS antenna ports allocated for codewords of higher MCS. In addition, in the case where MCS indexes of two codewords are the same, the PTRS antenna port is associated with a DMRS antenna port of the smallest index among DMRS antenna ports allocated for the first code (codeword 0).

In rel.1698r, studies are underway: for single PDCCH based multi-panel/TRP transmission shown in fig. 2B, two PTRS ports (a first PTRS port and a second PTRS port) are supported.

The UE may assume: one of the two PTRS ports (e.g., the first PTRS port) corresponds to a first TRP (one of the multiple PDSCHs) and the other (e.g., the second PTRS port) corresponds to a second TRP (the other of the multiple PDSCHs).

In addition, the UE may also be configured with two PTRS ports through RRC signaling. Further, whether a UE supports two PTRS ports may depend on the capabilities of the UE.

Here, in the case where the UE is indicated two TCI states (a first TCI state and a second TCI state) according to one TCI code point, the first and second PTRS ports are associated with DMRS antenna ports of the smallest index among DMRS antenna ports corresponding to the indicated first and second TCI states, respectively.

As such, the association of PTRS ports and DMRS ports has been studied in NR specifications for the case where the UE is set (configured) with two PTRS ports and indicated (indicated) with two TCI states.

However, with respect to other cases, for example, with respect to a case in which the UE is set with one PTRS port and is indicated with two TCI states, a case in which the UE is set with two PTRS ports and is indicated with one TCI state, a case in which a TCI is not indicated at all (or is indicated to be not properly used), and the like, research on association of a PTRS port and a DMRS port has not been performed. If these are not clearly defined, spatial diversity gain, high rank transmission, and the like in the case of using multi-panel/TRP cannot be appropriately realized, and an increase in communication throughput may be suppressed.

Therefore, the inventors of the present invention have conceived the association of the PTRS port and the DMRS port capable of coping with the case of using multi-panel/TRP.

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

In the present disclosure, a panel, an uplink (ul) transmitting entity, a TRP, a spatial relationship, a COntrol REsource SET (CORESET), a PDSCH, a codeword, a base station, a specific antenna port (e.g., a DeModulation Reference Signal (DMRS) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a Code Division Multiplexing (CDM) group, a specific Reference Signal group, a CORESET group), and the like may be substituted for each other. In addition, the panel identifier (id)) and the panel may be replaced with each other. The TRP ID and TRP may also be substituted for each other.

In addition, NCJT using multiple TRPs, multiple PDSCHs using NCJT, multiple PDSCHs from multiple TRPs, etc. may be substituted for each other in this disclosure. The multiple PDSCH may mean multiple PDSCHs in which at least a part of the time resources (for example, 1 symbol) overlap, or may mean multiple PDSCHs in which all the time resources (for example, all the symbols) overlap. That is, the UE may receive multiple PDSCHs in repeated timing or simultaneously.

In the present disclosure, the UE is set with n (for example, n is 1, 2, and …) PTRS ports, and may be set to use n PTRS ports.

Furthermore, in the present disclosure, the association of the PTRS ports and DMRS ports may also mean that, with respect to specific QCL types (e.g., types a and D), these ports may be considered to be QCLs.

In addition, in the present disclosure, a TCI state "of which" TCI state ID ═ X (X is an integer) and "TCI state # X", "TCI # X", and the like may be substituted for each other. Further, "antenna port" and "port" may be replaced with each other.

(Wireless communication method)

< first embodiment >

The first embodiment relates to association of a PTRS port and a DMRS port in the case where a UE is set with one PTRS port and is indicated with two TCI states (a first TCI state and a second TCI state).

The UE set with one PTRS port and indicated with two TCI states may also determine that the one PTRS port is associated with at least 1 DMRS port of the following (1) to (3):

(1) a DMRS port of a smallest index among DMRS ports corresponding to the indicated first TCI state.

(2) And the DMRS port with the smallest index in the DMRS ports corresponding to the TCI state with the smallest TCI state ID in the two indicated TCI states.

(3) The DMRS port with the smallest index among DMRS ports corresponding to the indicated TCI status related to higher layers (which may be replaced by a rank, number of layers, or the like).

In addition, when the ranks are the same for the two indicated TCI states, the UE may determine that the one PTRS port is associated with the DMRS port of (1) or (2) above.

In addition, in the present disclosure, "specific", "minimum", "maximum", "M-th from a smaller end" (M is an integer), and "M-th from a larger end" may be substituted for each other. "TCI codepoint" may be replaced with "codepoint of TCI field", "value of TCI field", and the like.

In addition, in the present disclosure, "first" may also be replaced with "first", "first in a TCI state set", and the like, and "second" may also be replaced with "last", "last in a TCI state set", and the like.

Fig. 3 is a diagram illustrating an example of association between a PTRS port and a DMRS port according to the first embodiment. In this example, a case where the UE is set to one PTRS port and the indicated TCI state is a TCI state set of { TCI #3, TCI #1} will be described.

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

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

According to the first embodiment described above, even when the number of set PTRS ports and the number of indicated TCI states applicable to multiple PDSCHs are different, it is possible to appropriately determine the association between a PTRS port related to the multiple PDSCHs and a DMRS port related to the multiple PDSCHs.

< second embodiment >

The second embodiment relates to the association of a PTRS port and a DMRS port in the case where a UE is set with two PTRS ports (a first PTRS port and a second PTRS port) and is indicated with one TCI status.

The UE set with two PTRS ports may also determine the number of actually received (or actually attempted to receive) PTRS ports of the two PTRS ports.

For example, the UE may also determine the actually received PTRS port based on at least one of the following (a) and (B):

(A) the number of TCI states indicated,

(B) The number of CDM groups associated with the indicated TCI status.

In the case of (a), if one TCI status is indicated, the UE to which two PTRS ports are set may receive a PTRS port (e.g., a first PTRS port) associated with a DMRS port with a minimum index among DMRS ports corresponding to the indicated one TCI status, or may not receive another set PTRS port (e.g., a second PTRS port).

In the case of (a), if two TCI states are indicated by the UE to which two PTRS ports are set, it is also conceivable that the first and second PTRS ports are associated with the DMRS antenna port with the smallest index among the DMRS ports corresponding to the indicated first and second TCI states, respectively, and each PTRS port is received.

In the case of (B) described above, if one TCI state corresponding to one CDM group is indicated, the UE to which two PTRS ports are set may receive a PTRS port (e.g., a first PTRS port) associated with a DMRS antenna port with a smallest index among DMRS ports corresponding to CDM groups of the indicated one TCI state, or may not receive another set PTRS port (e.g., a second PTRS port).

In the case of (B), if the UE to which two PTRS ports are set is instructed to have one TCI state corresponding to two CDM groups (first and second CDM groups), it is assumed that the first and second PTRS ports are associated with DMRS ports having the smallest index among DMRS ports corresponding to the first and second CDM groups, respectively, and each PTRS port is received.

According to the second embodiment described above, even when the number of set PTRS ports and the number of indicated TCI states applicable to multiple PDSCHs are different, it is possible to appropriately determine the association between a PTRS port related to the multiple PDSCH and a DMRS port related to the multiple PDSCH.

< third embodiment >

The third embodiment relates to a PTRS transmitted for a PDSCH when a time offset (scheduling offset) between reception of DL DCI and reception of the PDSCH corresponding to the DL DCI is smaller than a scheduling offset threshold. The PTRS in the third embodiment may be replaced with: a PTRS transmitted for the PDSCH if the scheduling offset is less than a scheduling offset threshold.

The scheduling offset may be common without depending on the TRP, or may be different for each TRP. The scheduling offset threshold may be common without depending on the TRP, or may be different for each TRP.

Here, in case that the scheduling offset is smaller than the scheduling offset threshold, the TCI state or QCL (QCL assumption) that the UE assumes to be applied to the PDSCH (DMRS of PDSCH) may also be referred to as a default TCI state. The default TCI state may also be interchangeable with a default QCL, default QCL assumptions, and the like. The TCI state or QCL (QCL envisioned) is hereinafter labeled as a default TCI state, but the designation is not limited thereto.

In addition, the definition of the default TCI state is not limited thereto. The default TCI state may be, for example, a TCI state assumed when the TCI state/QCL designated by the DCI cannot be used for a certain channel/signal (e.g., PDSCH), or a TCI state assumed when the TCI state/QCL is not designated (or set).

The UE may also determine a default TCI state (one or two default TCI states) for one or both of the multiple PDSCHs scheduled with the single PDCCH based on at least one of:

(a) the same rule as rel.15nr (QCL assumption for CORESET associated with the smallest CORESET-ID in the latest slot);

(b) QCL assumption for the single PDCCH;

(c) among the TCI states corresponding to the TCI codepoints specified by the TCI field of the above-mentioned single PDCCH, the TCI state of the TCI state ID associated with the corresponding panel (in other words, the TCI state of the corresponding panel represented by the TCI field);

(d) a TCI status corresponding to a specific TCI codepoint that may be specified by the TCI field of the single PDCCH;

(e) among all TCI states corresponding to codepoints that can be specified by the TCI field of the above-described single PDCCH, a TCI state of a specific TCI state ID with respect to a corresponding panel.

The "specific TCI codepoint" in the above-mentioned (d) may be, for example, the smallest TCI codepoint among the TCI codepoints indicating an arbitrary number of TCI states (that is, among all the TCI codepoints), or the smallest TCI codepoint among the TCI codepoints indicating two TCI states.

In addition, the xth (X is an integer) code point may be replaced with the xth TCI state activated by a MAC CE (e.g., a TCI state activation/deactivation MAC CE for a UE-specific PDSCH) for the PDSCH (or multiple PDSCHs), or may be replaced with the xth TCI state for the PDSCH set by RRC signaling.

The "all TCI states corresponding to the specifiable code points" in the above-mentioned (e) may mean all TCI states activated by the MAC CE, or may be replaced with all TCI states for the PDSCH set by RRC signaling.

When the UE determines n default TCI states in association with the multiple PDSCHs, the UE may be said to have the n default TCI states. If there are n TCI states corresponding to at least one of the above (a) to (e), it may also mean that the number of default TCI states that the UE has is n.

In the third embodiment, a UE having two PTRS ports and two default TCI states may determine that the first and second PTRS ports are associated with the DMRS antenna port with the smallest index among the DMRS antenna ports corresponding to the first and second default TCIs, respectively.

According to the content of replacing the indicated TCI status in the first embodiment with the default TCI status, a UE set with one PTRS port and having two default TCI statuses may also determine that the one PTRS port is associated with a specific DMRS port.

According to the content of replacing the indicated TCI status in the second embodiment with the default TCI status, a UE having two PTRS ports set and having one default TCI status may also determine that the two PTRS ports are respectively associated with a specific DMRS port.

According to the third embodiment described above, even when the number of set PTRS ports and the number of default TCI states applicable to multiple PDSCHs are the same or different, it is possible to appropriately determine the association between a PTRS port related to the multiple PDSCHs and a DMRS port related to the multiple PDSCHs.

< other embodiment >

In addition, the UE may also assume: the case in which 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 set with one PTRS may not expect to be indicated with two TCI states.

Furthermore, the UE may also envisage: the case in which two PTRS ports are set and one TCI status is indicated as described in the second embodiment is an error case. In other words, a UE that is set with two PTRSs may not expect to be indicated with two TCI states.

In addition, the above embodiments show the relationship between the DL PTRS port and the DL DMRS port, but are not limited thereto. In each of the above embodiments, for example, PTRS may be replaced with UL PTRS, and DMRS may be replaced with UL DMRS. In addition, one or both of the PTRS and DMRS may be replaced with other reference signals.

In addition, although the above-described embodiments have shown the example of a single PDCCH, the embodiments of the present disclosure may be applied to multiple PDCCHs.

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

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 4 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), New wireless (5th Generation mobile communication system New Radio (5G NR)) of the fifth Generation mobile communication system, or the like.

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), Dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station of NR (gNB) is MN and the base station of LTE (E-UTRA) (eNB) is SN.

The wireless communication system 1 may support Dual connection between a plurality of base stations in the same RAT (for example, Dual connection between MN and base station with SN being NR (gNB) (NR-NR Dual connection (NN-DC)))).

The wireless communication system 1 may include a base station 11 forming a macrocell C1 having a relatively wide coverage area, and a base station 12(12a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the illustrated embodiments. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

The user terminal 20 may also 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 (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

Each CC may be included in at least one of the first Frequency band (Frequency Range 1(FR1))) and the second Frequency band (Frequency Range 2(FR 2))). Macro cell C1 may also be contained in FR1, and small cell C2 may also be contained in FR 2. For example, FR1 may be a frequency band of 6GHz or less (sub-6GHz), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited to these, and FR1 may correspond to a higher frequency band than FR2, for example.

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 also be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a Backhaul, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) host, and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The Core Network 30 may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN)), a Next Generation Core (NGC), and the like.

The user terminal 20 may be a terminal supporting at least one of communication systems such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, in at least one of the downlink (dl)) and the 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), or the like may be used.

The radio access method may also be referred to as a waveform (waveform). In the wireless communication system 1, other wireless access schemes (e.g., other single-carrier transmission schemes and other multi-carrier transmission schemes) may be used for the UL and DL wireless access schemes.

In the radio communication system 1, as the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH))), a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))) and the like that are Shared by the user terminals 20 may be used.

In addition, in the radio communication system 1, as the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH)), a Random Access Channel (Physical Random Access Channel (PRACH)), or the like Shared by each user terminal 20 may be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, and the like may also be transmitted via the PUSCH. In addition, a Master Information Block (MIB)) may also be transmitted through PBCH.

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

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, etc., and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). A CORESET may also be associated with one or more search spaces. The UE may also monitor the CORESET associated with a search space based on the search space settings.

One search space may also correspond to PDCCH candidates that conform to one or more aggregation levels (aggregation levels). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may be transmitted through the PUCCH. Through the PRACH, a random access preamble for establishing a connection with a cell may also be transmitted.

In the present disclosure, a downlink, an uplink, and the like may be expressed without adding a "link". Note that the "Physical" may be expressed without adding a Physical (Physical) "to the head of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS may be a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a DeModulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), or the like.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks containing the SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a measurement Reference Signal (SRS), a demodulation Reference Signal (DMRS), and the like may be transmitted. In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 5 is a diagram showing an example of the configuration of a base station according to an 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 (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 be provided in one or more numbers.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and it is also conceivable that the base station 10 further has other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation, scheduling (e.g., resource allocation, mapping), etc. of signals. 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 path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmitting/receiving section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may also include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

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

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, the transmission/reception unit 120 (transmission processing unit 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like on Data, Control information, and the like acquired from the Control unit 110, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception unit 120(RF unit 122) may perform modulation, filtering, amplification, and the like on the baseband signal in a 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 section 120(RF section 122) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

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

The transmission path interface 140 may transmit/receive signals (backhaul signaling) to/from devices included in the core network 30, other base stations 10, and the like, and acquire and transmit user data (user plane data) and control plane data and the like for the user terminal 20.

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

Furthermore, transmission/reception section 120 may transmit one or both of a Plurality of Downlink Shared Channels (PDSCHs) scheduled based on one Downlink control information (single PDCCH).

(user terminal)

Fig. 6 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided, and the user terminal 20 may further include other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

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

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmission/reception section 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

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

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

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

Transmission/reception section 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

Transmission/reception section 220 (transmission processing section 2211) may perform processing in the PDCP layer, processing in the RLC layer (e.g., RLC retransmission control), processing in the MAC layer (e.g., HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, for example, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing in a case other than that.

The transmission/reception section 220(RF section 222) may perform modulation, filter processing, amplification, and the like on the baseband signal in 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 section 220(RF section 222) may amplify, filter, demodulate a signal in a radio frequency band received by the transmission/reception antenna 230 to a baseband signal.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

Further, control section 210 may determine the relationship between the PTRS port related to the PDSCH and the DeModulation Reference Signal (DMRS)) port related to the multiple PDSCH, when the number of set Phase Tracking Reference Signal (PTRS) ports, the number of instructed Transmission setting Indication states (TCI states) applied to multiple Downlink Shared channels (PDSCHs), or the number of default TCI states applied to the multiple PDSCHs are different.

The transmission/reception unit 220 may also receive the multiple PDSCHs based on one downlink control information (single PDCCH).

When the number of set PTRS ports is 1 and the number of indicated TCI states or the number of default TCI states is 2, control section 210 may determine that the one PTRS port is associated with the DMRS port with the smallest index among the DMRS ports corresponding to the indicated first TCI state (see (1) of the first embodiment).

When the number of set PTRS ports is 1 and the number of indicated TCI states or the number of default TCI states is 2, control section 210 may determine that the DMRS port with the smallest index is associated with the PTRS port corresponding to the indicated TCI state with respect to the higher rank (see (3) of the first embodiment).

In the case where the number of the set PTRS ports is 2, the control unit 210 may also determine the number of actually received PTRS ports based on the number of the indicated TCI states or the number of the default TCI states (refer to the second embodiment).

When the number of set PTRS ports is 2, control section 210 may determine the number of actually received PTRS ports based on the number of indicated TCI states or the number of Code Division Multiplexing (CDM) groups associated with the default TCI state (refer to (B) of the second embodiment).

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one physically or logically combined device, or may be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, by wire or wireless) and using these multiple devices. The functional blocks may be implemented by software for one or more of the above-described apparatuses.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (assigning), and the like. For example, a function block (a configuration unit) that functions as a transmission function may be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. All as described above, the implementation method is not particularly limited.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, languages such as a device, a circuit, an apparatus, a section (section), a unit (unit), and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the illustrated devices, or may not include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. Further, the processing may be executed by 1 processor, or the processing may be executed by 2 or more processors simultaneously, sequentially, or by using another method. Further, the processor 1001 may be implemented by 1 or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, causing hardware such as the processor 1001 and the memory 1002 to read specific software (program), causing the processor 1001 to perform an operation to control communication via the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the read program (program code), software module, data, and the like. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110(210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and may be implemented similarly for other functional blocks.

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

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of a Floppy disk, a Floppy (registered trademark) disk, an optical disk (for example, a Compact disk ROM (CD-ROM)) or the like), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card (smart card), a flash memory device (for example, a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, and other suitable storage media. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the communication device 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above may be implemented by the communication device 1004. The sending and receiving unit 120(220) may also be implemented by physically or logically separating the sending unit 120a (220a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) 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, or the like) that outputs Light to the outside.

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

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

(modification example)

In addition, terms described in the present disclosure and 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 substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), Pilot Signal, etc. depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, the subframe may be formed of one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

Here, the parameter set (numerology) may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set (numerology) may indicate, for example, at least one of SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the Time domain, and the like.

The time slot may be formed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like). Further, the time slot may also be a time unit based on a parameter set.

A timeslot may also contain multiple mini-slots. Each mini-slot may also be made up of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of a fewer number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other names respectively corresponding thereto. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with one another.

For example, 1 subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and 1 slot or 1 mini-slot may also be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, a period shorter than 1ms (for example, 1 to 13 symbols), or a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, and is not referred to as a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidths, transmission powers, and the like that can be used by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit such as a channel-coded data packet (transport block), code block, or code word, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, a time interval (e.g., the number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped may also be shorter than the TTI.

In addition, when 1 slot or 1 mini-slot is referred to as a TTI, 1 or more TTI (i.e., 1 or more slot or 1 or more mini-slot) may be a minimum time unit for scheduling. In addition, the number of slots (mini-slot number) constituting the minimum time unit of the schedule may also be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A 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 (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set (numerology), for example, 12. The number of subcarriers included in the RB may also be decided based on a parameter set (numerology).

In addition, 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 of 1 TTI and 1 subframe may be configured by one or more resource blocks.

One or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks) for a certain parameter set (numerology) in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are assigned sequence numbers within the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For the UE, one or more BWPs may also be set within 1 carrier.

At least one of the set BWPs may be active, and the UE may not expect to transmit or receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described structures of the radio frame, the subframe, the slot, the mini slot, the symbol, and the like are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed by absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

The names used for parameters and the like in the present disclosure are not limitative names in any point. Further, the equations and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limitative names in any way.

Information, signals, and the like described in this disclosure may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

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

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

The information notification is not limited to the embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), or the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

The physical Layer signaling may also be referred to as Layer1/Layer 2(Layer1/Layer2(L1/L2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may be referred to as 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. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of another information).

The determination may be performed by a value (0 or 1) expressed by 1 bit, a true-false value (boolean) expressed by true (true) or false (false), or a comparison of numerical values (for example, a comparison with a specific value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subprograms, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

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

The terms "system" and "network" as used in this disclosure are used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi-Co-location (qcl)", "Transmission setting Indication state (TCI state)", "spatial relationship (spatial relationship)", "spatial domain filter", "Transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gtnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. A base station is also sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. In the case where a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also be provided with a communication service by a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))) — the term "cell" or "sector" refers to a part or the entire coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like can be used interchangeably.

A mobile station is also sometimes referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), an unmanned moving body (e.g., an unmanned aerial vehicle, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a 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.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the various aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (e.g., may also be referred to as Device-to-Device (D2D)), Vehicle networking (V2X), and the like). In this case, the user terminal 20 may have the functions of the base station 10 described above. The language such as "uplink" or "downlink" may be replaced with a language (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Also, the user terminal in the present disclosure may be replaced with 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, it is assumed that the operation performed by the base station is also performed by its upper node (upper node) depending on the case. In a network including one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like are considered, but not limited thereto), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched and used in conjunction with execution. Note that the order of the processing procedures, sequences, flowcharts, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as there is no contradiction. For example, elements of various steps are presented in an exemplary order for the method described in the present disclosure, and the order is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, fourth generation Mobile communication System (4th generation Mobile communication System (4G)), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (FRA)), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio (NR)), New Radio Access (NX)), next generation Radio Access (Future Radio Access)), Global Mobile Broadband communication System (Global System for Mobile communication (GSM), Mobile Broadband Mobile Communication (CDMA) and Mobile Broadband (CDMA) registration (2000 Mobile communication (GSM)), and Mobile Broadband communication System (Radio Access)) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), bluetooth (registered trademark), a system using another appropriate wireless communication method, and a next generation system expanded based on these. Further, a combination of a plurality of systems (for example, LTE, or a combination of LTE-a and 5G) may be applied.

The description of "based on" used in the present disclosure does not mean "based only on" unless explicitly stated otherwise. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to be a comprehensive limitation on the quantity or order of such elements. These designations can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements can be used or that in some form the first element must precede the second element.

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search (search), query (inquiry)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as "determination (decision)" performed for solving (resolving), selecting (selecting), selecting (breathing), establishing (evaluating), comparing (comparing), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" performed on some operation.

The "determination (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

The term "connected" or "coupled" or any variant thereof used in the present disclosure means any connection or coupling, directly or indirectly, between 2 or more elements, and can include a case where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed".

In the present disclosure, in the case of connecting two elements, it can be considered that they are "connected" or "combined" with each other using one or more electric wires, cables, printed electric connections, etc., and that they are "connected" or "combined" with each other using electromagnetic energy having wavelengths of a radio frequency domain, a microwave domain, and a light (visible and invisible light) domain as some non-limiting (non-limiting) and non-inclusive (non-inclusive) examples.

In the present disclosure, the term "a is different from B" may also mean "a and B are different from each other". In addition, the term may also mean "a and B are different from C, respectively". The terms "separate", "combine", and the like are also to be construed as "different".

When the terms "include", "including", and "including" and their variants are used in the present disclosure, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may also include the case where nouns succeeding the articles are plural.

While the invention according to the present disclosure has been described in detail, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and a variation without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes, and the invention according to the present disclosure is not intended to be limited thereto.

Claims (6)

1. A terminal, characterized by having:

a control unit configured to determine an association between a PTRS port related to a multi-PDSCH and a demodulation Reference Signal (DMRS)) port related to the multi-PDSCH if the number of set Phase Tracking Reference Signal (PTRS) ports is different from the number of Transmission Configuration Indication states (TCI states) indicated to be applied to the multi-Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) or the number of default TCI states applied to the multi-PDSCH; and

a receiving unit which receives the multiple PDSCHs based on one downlink control information.

2. The terminal of claim 1,

when the number of the 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 determines that the one PTRS port is associated with the DMRS port with the smallest index among the DMRS ports corresponding to the indicated first TCI state.

3. The terminal of claim 1,

when the number of set PTRS ports is 1 and the number of indicated TCI states or the number of default TCI states is 2, the control unit determines that the DMRS port associated with the smallest index among DMRS ports corresponding to the indicated TCI states with respect to the higher rank is associated with the DMRS port associated with the smallest index among the DMRS ports.

4. A terminal according to any of claims 1 to 3,

in the case where the set number of PTRS ports is 2, the control unit determines the number of PTRS ports actually received based on the indicated number of TCI states or the default number of TCI states.

5. A terminal according to any of claims 1 to 3,

when the number of the set PTRS ports is 2, the control unit determines the number of actually received PTRS ports based on the number of the indicated TCI states or the number of Code Division Multiplexing (CDM) groups associated with the default TCI states.

6. A wireless communication method for a terminal, comprising:

a step of determining an association between a PTRS port related to a multiple PDSCH and a demodulation Reference Signal (DMRS)) port related to the multiple PDSCH if the number of set Phase Tracking Reference Signal (PTRS) ports is different from the number of instructed Transmission setting Indication states (TCI states) applied to a multiple Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) or the number of default TCI states applied to the multiple PDSCH; and

a step of receiving the multiple PDSCHs based on one downlink control information.

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