RU2792878C1 - User terminal and radio communication method - Google Patents

Abstract

FIELD: communication technology.

SUBSTANCE: technical result is to ensure the implementation of the downlink in the preferred way, even when using multiple panels/TRP (eng. transmission/reception points). Said technical result is achieved by that the user terminal comprises a receiving section configured to receive a downlink common channel (Physical Downlink Shared Channel (PDSCH)) based on one piece of downlink control information, and a control section configured to determine the number of standard quasi-colocation options (QCL) to be applied to the specified PDSCH based on the specified downstream control information.

EFFECT: implementation of the downlink in the preferred way, even when using multiple panels/TRP.

3 cl, 18 dwg

Description

The field of technology to which the invention belongs

The present invention relates to a user terminal and a radio communication method in next generation mobile communication systems.

State of the art

For the Universal Mobile Telecommunications System (UMTS) network, a Long Term Evolution (LTE) specification project was proposed, the purpose of which is to further increase the data rate, reduce latency, etc. (see non-patent document 1). In addition, for further capacity enhancements, improvements, and the like. LTE systems (versions 8 and versions 9 of the Third Generation Partnership Project (3GPP)) have been proposed specifications for the LTE-Advanced system (versions 10-14 3GPP).

LTE successor systems are also being developed (called, for example, the 5G mobile communication system (5G), the 5G+ system, the New Radio system (English New Radio, NR), the 3GPP version 15 and later system, etc.).

List of Cited Materials

Non-Patent Documents

Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)," April, 2010.

Disclosure of the essence of the invention Technical task

For future radio communication systems (for example, NR), the following scheme is being studied: the user terminal (user equipment, English. User Equipment, UE) controls for at least one of the signal and channel (hereinafter signal / channel) receiving processing demodulation, decoding, reception beamforming, or the like) and processing for transmission (eg, mapping, modulation, coding, precoding, transmission beamforming, or the like) based on information related to quasi-collocation (English Quasi- Co-Location, QCL) of this signal/channel.

For NR, the following scheme is also being studied: one or multiple Transmission/Reception Points (TRPs) (several TRPs) perform downstream transmission (for example, the transmission of a Physical Downlink Shared Channel (PDSCH) in UE using one or multiple panels (multiple panels).

However, the NR specifications defined so far do not consider the possibility of using multiple panels/TRPs, and therefore it is not possible to properly control the QCL guess when using multiple panels/TRPs. Thus, compliance with the current NR specifications when using multiple panels/TRP does not make it possible to realize advantageously the gain from space diversity, high rank transmission, etc., which may hinder the increase in throughput.

In light of this, one of the objectives of the present invention is to provide a user terminal and a radio communication method with which downlink communication can be carried out in an advantageous manner even when multiple panels/TRPs are used.

The solution of the problem

A user terminal according to an aspect of the present invention comprises: a receiving section configured to receive a downlink common channel (Physical Downlink Shared Channel (PDSCH)) based on one piece of downlink control information; and a control section configured to determine the number of standard quasi-colocation options (standard QCLs) to apply to said PDSCH based on said downstream control information.

Beneficial Effects of the Invention

According to an aspect of the present invention, even when multiple panels/TRPs are used, downlink communication is possible in a preferred manner.

Brief description of the drawings

Fig. 1 represents an example of a QCL guess of a DMRS port of a PDSCH.

Each of FIGS. 2A-2D represents an example of a use case for multiple TRPs.

FIG. 3 represents a problem with respect to the QCL assumption of DMRS ports of PDSCHs when using multiple panels/TRPs.

Each of FIGS. 4A and 4B represents an example of guessing the QCLs of the DMRS ports of the PDSCHs according to the first implementation.

Each of FIGS. 5A and 5B represents an example of the assumption of QCLs of DMRS ports of PDSCHs according to a modification of the first implementation.

Each of FIGS. 6A and 6B represents an example of guessing the QCLs of the DMRS ports of the PDSCHs according to the second implementation.

Each of FIGS. 7A and 7B represents an example of guessing the QCLs of the DMRS ports of the PDSCHs according to the modification of the second implementation.

Fig. 8 represents an example of a generalized configuration of a radio communication system in accordance with one implementation.

Fig. 9 shows an example of a base station configuration according to one implementation.

Fig. 10 represents an example of a user terminal configuration according to one implementation.

Fig. 11 shows an example of a hardware configuration of a base station and a user terminal according to one implementation.

Implementation of the Invention (QCL/TCI)

For NR, receive processing control (e.g., at least one of reception, demapping, demodulation, and decoding) of at least one of a signal and a channel (hereinafter “signal/channel”) is learned based on the state of the transmission configuration flag (TCI state). .Transmission Configuration Indication State).

The TCI state is signal/channel related quasi-colocation (QCL) information, and may also be referred to as a reception spatial parameter, spatial relationship information, or the like. The TCI state may be set per UE, per channel, or per signal.

QCL is a measure of the statistical properties of a signal/channel. For example, having a QCL relationship of a signal/channel with another signal/channel may mean that for so many different signals/channels, there is reason to assume that at least one of Doppler shift, Doppler spread, average delay, delay distribution, and spatial parameter is equal (e.g., spatial reception parameter (spatial parameter Rx)) (may mean that quasi-collocation (QCL) occurs with respect to at least one of these properties).

Note that the spatial receive parameter may correspond to a receive beam of the UE (eg, an analog receive beam), and this beam may be determined based on the spatial QCL. QCL (or at least one QCL element) in the present disclosure can be interpreted as a spatial QCL (English spatial QCL, sQCL).

Different types of QCLs can be specified. For example, four types of QCLs (types A-D) may be provided, differing in which parameter(s, parameter set(s)) may be assumed to be the same. The following describes the options:

- Type A QCL: Doppler shift, Doppler broadening, average delay and delay distribution;

- type B QCL: Doppler shift and Doppler broadening;

- type C QCL: Doppler shift and average delay;

- type D QCL: spatial receive parameter.

The UE's assumption that a certain CORESET, channel, or reference has a particular QCL relationship (eg, Type D QCL) with another CORESET, channel, or reference may be referred to as a QCL assumption.

The UE is configured to determine at least one of a transmit path (Tx path) and a receive path (Rx path) of a signal/channel based on the TCI state or QCL assumption of that signal/channel.

The TCI state can be, for example, information related to the QCL between the target channel (or Reference Signal (RS) for this channel) and another signal (for example, another downlink reference signal (English Downlink Reference Signal, DL- RS)). The TCI state may be specified (indicated) by upper layer signaling, physical layer signaling, or a combination of these signaling types.

In the present invention, the upper layer signaling can be, for example, any of Radio Resource Control (RRC) layer signaling, Medium Access Control (MAC) layer signaling, broadcast information, and the like. ., or their combinations.

In said MAC layer signaling, for example, MAC control elements (MAC control element, MAC CE), MAC layer protocol data elements (Protocol Data Unit, PDU), etc. can be used. The specified broadcast information can be, for example, a Master Information Block (MIB), a System Information Block (SIB), a minimum system information (the rest of the minimum system information, the Remaining Minimum System Information, RMSI), other system information (English Other System Information, OSI) or the like.

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

The channel configured (set) using the TCI state may be, for example, at least one of a downlink common channel (Physical Downlink Shared Channel (PDSCH)), a downlink control channel (physical downlink control channel ( Physical Downlink Control Channel (PDCCH)), uplink common channel (Physical Uplink Shared Channel (PUSCH)) and uplink control channel (Physical Uplink Control Channel (PUCCH)) .

The reference signal having a QCL relationship with the specified channel may be, for example, at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI). RS) and a reference signal for measurement (probing reference signal (Sounding Reference Signal, SRS)).

SSB is a signal block containing at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS) and a broadcast channel (Physical Broadcast Channel). , Strategic Missile Forces)). An SSB block may be referred to as an SS/PBCH block.

The TCI state information element defined using upper layer signaling (the RRC layer "TCI-state 1E" element) may contain one or more pieces of QCL information ("QCL-info"). This QCL information may contain at least one of information related to a DL-RS having a QCL relationship (DL-RS relationship information) and information indicating a QCL type (QCL type information). The DL-RS relationship information may contain information about the index of the indicated DL-RS (for example, the SSB index or the CSI-RS resource identifier with non-zero power), the cell index in which the indicated RS is located, the Bandwidth Part , BWP) in which the specified RS is located, or the like.

<TCI Status for PDCCH>

The information related to the QCL between the PDCCH (or the DMRS antenna port related to the specified PDCCH) and the specified DL-RS may be referred to as the TCI state for the specified PDCCH or the like.

The UE is configured to determine the TCI state for the PDCCH (CORESET) specific to the UE based on the upper layer signaling.

In the present invention, the upper layer signaling can be, for example, any of Radio Resource Control (RRC) layer signaling, Medium Access Control (MAC) layer signaling, broadcast information, and the like. ., or a combination of the above.

For example, MAC layer control elements (MAC control element, MAC CE), MAC layer protocol data elements (Protocol Data Unit, PDU), etc. can be used in MAC layer signaling. The broadcast information may be, for example, Master Information Block (MIB), System Information Block (SIB), Minimum System Information (RMSI), and the like.

For example, using RRC (ControlResourceSet) signaling, one or more (K) TCI states can be set for the UE for each CORESET. The UE may activate one or more TCI states for each CORESET using the MAC CE. This MAC CE may be referred to as a MAC CE indicating the TCI state of the UE-specific PDCCH (MAC CE for indicating the TCI state of the UE-specific PDCCH). The UE may monitor CORESET based on the active state of the TCI corresponding to the specified CORESET.

<TCI Status for PDSCH>

The information related to the QCL between the PDSCH (or the DMRS antenna port related to the PDSCH) and the given DL-RS may be referred to as the TCI state for the given PDSCH or the like.

Using upper layer signaling, the UE may be notified (to the UE may be set) M (M>1) TCI states for the PDSCH (M pieces of QCL information for the PDSCH). It should be appreciated that the number M of TCI states assigned to a UE may be limited by at least one of the UE's capability and the QCL type.

The downstream control information (DCI) used for scheduling a PDSCH may comprise a predetermined field indicating the TCI state for that PDSCH (this field may be called, for example, a TCI field, a TCI state field, or the like). The specified DCI may be used for PDSCH scheduling of a single cell, and may be referred to as downstream DCI, downstream assignment, 1_0 format DCI, 1_1 format DCI, or the like, for example.

The inclusion or non-inclusion of the TCI field in the DCI may be controlled by information reported to the UE from the base station. Said information may be information indicating the presence or absence of a TCI field in the DCI (eg, TCI presence information, TCI presence information in the DCI, upper layer tci-PresentInDCI parameter). This information may be set for the UE, for example, using upper layer signaling.

When the DCI contains a TCI field of x bits (eg, x=3), the base station may predetermine at most 2 ^x (eg, 8 if x=3) TCI state types for the UE using upper layer signaling. The value of the TCI field in the DCI may indicate one of the TCI states predetermined using upper layer signaling.

When more than eight types of TCI states are set for the UE, eight or less types of TCI states can be activated (or indicated) using the MAC CE. This MAC CE may be referred to as the TCI States Activation/Deactivation for UE-specific PDSCH MAC CE MAC CE. The value of the TCI field in the DCI may indicate one of the TCI states activated using this MAC CE.

This MAC CE is used to indicate the TCI state, which maps the code in the TCI field in the DCI to the TCI state identifiers set using RRC signaling, and to activate the indicated TCI state. An activated TCI state may be mapped from a code with a value of 0 to 2 ^x - 1 (eg, up to 7 for x=3) in the TCI field to TCI state identifiers in ascending or descending order.

If the slot in which the UE transmits the Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) acknowledgment for the PDSCH for the MAC CE message is designated by number n, then the activation/deactivation (relationship between the TCI field in the DCI and the state TCI) based on this MAC CE can be applied starting from slot n + 3 * (number of slots in subframe) + 1. In other words, changing the code in the TCI field based on the specified MAC CE can take effect in slot n + 3 * ( number of slots in subframe)+1.

When the TCI presence information is set to true, the TCI field in the DCI on the elementary carrier (FC) for scheduling (indicated by the PDSCH) indicates the state of the TCI activated in the indicated scheduled FC or downstream BWP, and the PDSCH is scheduled using DCI format 1_1, UE may use the TCI in accordance with the value of the TCI field in the PDCCH containing the specified DCI and detected in order to determine the QCL of the antenna port of the specified PDSCH.

When the time offset between receiving a downstream DCI and receiving a PDSCH corresponding to a specified DCI is greater than or equal to a predetermined threshold, the UE may assume that the reference signal is in the TCI state related to the QCL type parameter given by the TCI state indicated by that DCI, and the port The DMRS of the serving cell for the specified PDSCH are in quasi-collocation ("DM-RS ports of the serving cell of the PDSCH are in quasi-collocation with the reference signal(s) in the TCI state with respect to the QCL type parameter(s) given by the TCI state which is indicated").

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

The specified threshold may be referred to as "threshold", "threshold for offset between the DCI indicating the TCI state and the PDSCH scheduled by the specified DCI", "Threshold-Sched-Offset", "timeDurationForQCL", scheduling offset threshold, threshold a scheduling offset value, a time duration for QCL, or the like.

The scheduling offset threshold may be dependent on the UE's capability or delay in, for example, PDCCH decoding and beam changing. The scheduling offset threshold information may be set from the base station using upper layer signaling, or may be transmitted from the UE to the base station.

When the scheduling offset is less than the scheduling offset threshold, the UE may assume that the reference signal is in the TCI state associated with the QCL parameter used to indicate the PDCCH QCL corresponding to the lowest CORESET-ID at the latest (most recent) a slot in which one or more control resource sets (CORESET) are defined for the UE in the active part of the frequency band (BWP) of the serving cell, and the DMRS port of the PDSCH of the serving cell is in quasi-collocation (the DM-RS ports of the serving cell of the PDSCH are in quasi-collocation with reference signal(s) in the TCI state with respect to the QCL parameter(s) used to indicate the PDCCH quasi-colocation of the lowest CORESET-ID in the latest slot in which one or more CORESETs in the active serving cell BWP are configured for the specified UE).

For example, the UE may assume that the DMRS port of the PDSCH is in quasi-collocation with the DL-RS based on the state of the TCI activated for the CORESET corresponding to the lowest CORESET-ID. The specified latest slot may be, for example, the slot in which the DCI is received for scheduling the specified PDSCH.

Note that the CORESET-ID may be an identifier (an identifier for CORESET identification) specified by the ControlResourceSet element of the RRC layer information.

Fig. 1 represents an example of a QCL guess of a DMRS port of a PDSCH. In this example, the scheduling offset is less than the scheduling offset threshold. Accordingly, the UE may assume that the DMRS port of the PDSCH is in quasi-collocation with the reference signal (eg, with DMRS for PDCCH) in the TCI state for the PDCCH corresponding to the lowest CORESET-ID in the latest slot.

When the UE is configured to use a single slot PDSCH, then the TCI state that is indicated may be based on the TCI state activated in the slot containing the scheduled PDSCH. When the UE is configured to use a multi-slot PDSCH, then the TCI state that is indicated may be based on the TCI state activated in the first slot containing the scheduled PDSCH, and the UE may assume that the TCI state that is indicated is the same in all slots containing this scheduled PDSCH.

When the UE is configured to use a CORESET associated with a plurality of search spaces for Cross Carrier Scheduling, then the UE is configured using TCI presence information having a value corresponding to true for the specified CORESET, and when at least one of of the TCI states specified for the serving cell scheduled using the specified set of search spaces contains a type D QCL, the UE may assume that the time offset between the detected PDCCH and the PDSCH corresponding to the specified PDCCH is greater than or equal to the threshold.

(Lots of TRPs)

For NR, a scheme is being studied in which one or multiple Transmission/Reception points (TRPs) (multiple TRPs) downlink to the UE using one or multiple panels (multiple panels). A scheme in which the UE performs uplink transmission to one or multiple TRPs is also being studied.

It should be noted that the specified set of TRPs may correspond to the same cell ID (English Cell ID) or different Cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

Each of figa-2D represents an example of a variant using multiple TRP. These examples assume that each TRP can transmit four different beams. However, this is not a limitation.

In the example of FIG. 2A, only one TRP (in this case, TRP 1) of multiple TRPs transmits to the UE (this situation may be referred to as single mode, single TRP, or the like). In this case, TRP 1 transmits both a control signal (Physical Downlink Control Channel (PDCCH)) and a data signal (PDSCH) to the UE.

In the example of FIG. 2B, only one TRP (in this case TRP 1) of multiple TRPs transmits a control signal to the UE, and these multiple TRPs transmit a data signal to the UE (this situation may be referred to as single master mode). The UE receives each PDSCH transmitted from these multiple TRPs based on one piece of downstream control information (DCI).

In the example of FIG. 2C, each of the multiple TRPs transmits a portion of the control signal to the UE, and the multiple TRPs transmit a data signal to the UE (this situation may be referred to as master-slave mode). Part 1 of the specified control signal (DCI) may be transmitted from TRP 1, and part 2 of the specified control signal (DCI) may be transmitted from TRP 2. Part 2 of the control signal may depend on part 1. The UE receives each PDSCH transmitted from these multiple TRPs, based on the specified parts of the DCI.

In the example of FIG. 2D, each of the multiple TRPs transmits a different control signal to the UE, and the multiple TRPs transmit a data signal to the UE (this situation may be referred to as multi-master mode). The first control signal (DCI) may be transmitted from TRP 1 and the second control signal (DCI) may be transmitted from TRP 2. The UE receives each PDSCH transmitted from these multiple TRPs based on these DCI parts.

When a plurality of PDSCHs (which may be referred to as multiple PDSCHs) of a plurality of TRPs as shown in FIG. 2B are scheduled using one DCI part, this DCI part may be referred to as a single DCI (single PDCCH). When each of a plurality of PDSCHs of multiple TRPs as shown in FIG. 2D is scheduled using a plurality of DCI parts, the plurality of DCI parts may be referred to as a multiple DCI (multiple PDCCHs).

From each TRP of several TRPs, different code words (English Code Words, CW) and levels can be transmitted. Non-Coherent Joint Transmission (NCJT) is being studied as one of the transmission modes using multiple TRPs.

In NCJT, for example, TRP 1 applies modulation mapping and layer mapping to the first codeword to obtain the first number of layers (eg, two layers), and transmits the first PDSCH using the first precoding. TRP 2 applies modulation mapping and layer mapping to the second codeword to obtain a second number of layers (eg, two layers), and transmits the second PDSCH using the second precoding.

It should be appreciated that it can be determined that the plurality of PDSCHs (multiple PDSCHs) to be transmitted using the NCJT partially or completely overlap, at least in the time and frequency domains. In other words, at least one of the time and frequency resources of the first PDSCH of the first TRP and the second PDSCH of the second TRP may overlap.

These first PDSCH and the second PDSCH may be considered to be non-quasi-colocated (non-quasi-colocated). Reception of multiple PDSCHs may be interpreted as simultaneous reception of PDSCHs that do not have a Type D QCL relationship.

The above-described multi-TRP variant allows more flexible transmission control to be realized using a channel having a satisfactory quality.

However, the NR specifications defined so far do not consider the possibility of using multiple panels/TRPs, and therefore it is not possible to properly control the QCL guess when using multiple panels/TRPs.

FIG. 3 shows a problem with guessing the QCLs of the DMRS ports of the PDSCHs when using multiple panels/TRPs. This example corresponds to the multiple PDCCH example shown in FIG. 2D.

The UE receives DCI 1 and PDSCH 1 transmitted from panel 1 (either from TRP 1 or from DMRS port group 1). Scheduling offset 1 from receiving DCI 1 to PDSCH 1 is less than the scheduling offset threshold.

The UE receives DCI 2 and PDSCH 2 transmitted from panel 2 (either from TRP 2 or from DMRS port group 2). Scheduling offset 2 from receiving DCI 2 to PDSCH 2 is less than the scheduling offset threshold.

For the example in FIG. 3, it has not yet been investigated which QCL between PDSCH 1 and PDSCH 2 should be assumed. Thus, compliance with the current NR specifications when using multiple panels/TRP does not make it possible to realize advantageously the gain from space diversity, high rank transmission, etc., which may hinder the increase in throughput.

In light of this, the present inventors came up with the idea of a QCL assumption that could be applied when using multiple panels/TRPs.

Next, with reference to the drawings, implementations in accordance with the present disclosure are described in detail. The radio communication methods according to respective implementations may be used alone or in combination.

Note that in the present disclosure, panel, uplink entity, TRP, spatial relationship, control resource set (CORESET), PDSCH, codeword, base station, given antenna port (e.g., demodulation reference signal (DMRS) port), a predetermined antenna port group (for example, a DMRS port group), a predetermined group (for example, a Code Division Multiplexing (CDM) group), a predetermined reference signal group or a CORESET group, and the like. can be understood in the same way.

Panel identifier (ID) and panel can be understood in the same sense. The identifier TRP and TRP can be understood in the same sense.

In the present disclosure, NCJTs, NCJTs using multiple TRPs, multiple PDSCHs using NCJTs, multiple PDSCHs, multiple PDSCHs of multiple TRPs, and the like. can be understood in the same way. It should be appreciated that multiple PDSCHs may refer to a plurality of PDSCHs that overlap at least a portion of the time resources (eg, one symbol), or may refer to a plurality of PDSCHs that overlap all of the time resources (eg, all symbols). In other words, the UE may receive multiple PDSCHs either in overlapping time slots or simultaneously.

(Radio communication method)

<First Implementation>

In the first implementation, when the time offset (scheduling offset) between the reception of the downlink DCI and the receipt of the PDSCH corresponding to the specified DCI is less than the scheduling offset threshold, the UE may assume that the DMRS port of the serving cell PDSCH is in quasi-collocation with a reference signal in the TCI state related to the QCL parameter used to indicate the QCL of the PDCCH of the lowest CORESET-ID having a particular associated Panel ID in the latest slot in which one or more CORESETs in the active BWP of the serving cell are configured for the specified UE.

Here, the specified specific associated panel ID may be, for example, the minimum or maximum panel ID in the latest slot in which one or more CORESETs in the active BWP of the serving cell are configured for the specified UE.

Each of FIGS. 4A and 4B represents an example of guessing the QCLs of the DMRS ports of the PDSCHs according to the first implementation. The example in Fig. 4A is the same as the example in Fig. 3. The example in FIG. 4B differs from FIG. 4A in that the scheduling offset 1 is greater than or equal to the scheduling offset threshold. Note that these examples assume that the particular associated panel ID is panel ID1. However, this is not a limitation.

4A, both scheduling bias 1 and scheduling bias 2 are less than the scheduling bias threshold. Accordingly, the UE may assume that both the DMRS port of PDSCH 1 and the DMRS port of PDSCH 2 are in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the lowest CORESET-ID of panel 1 in the latest slot.

Note that DCI 1 may be carried in the CORESET having the lowest CORESET-ID of panel 1, or may be carried in another CORESET (The same is true for the following drawing figures; even if CORESET and DCI are mentioned, this DCI may or may not be contained in the specified CORESET).

4B, scheduling bias 1 is greater than the scheduling bias threshold and scheduling bias 2 is less than the scheduling bias threshold. Accordingly, the UE may assume that the PDSCH 1 DMRS port is in quasi-collocation with the reference signal in the TCI state related to the QCL type parameter given by the TCI state indicated by DCI 1. The UE may assume that the PDSCH 2 DMRS port is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the lowest CORESET-ID of panel 1 in the latest slot.

Note that, as a modification of the first implementation, when the scheduling related offset is less than the scheduling related offset threshold, the UE may assume that the DMRS port of the serving cell PDSCH is in quasi-collocation with the reference signal in the TCI state related to parameter The QCL used for the PDCCH to schedule a PDSCH having a particular associated panel ID in the latest slot in which one or more CORESETs in the active BWP of the serving cell are configured for the specified UE.

Each of FIGS. 5A and 5B represents an example of the QCL assumption of the DMRS ports of the PDSCHs according to this modification of the first implementation. Fig. 5A and 5B are the same as FIGS. 4A and 4B, respectively, except for the QCL assumption.

5A, both scheduling bias 1 and scheduling bias 2 are less than the scheduling bias threshold. Accordingly, the UE may assume that both the DMRS port of PDSCH 1 and the DMRS port of PDSCH 2 are in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the DCI (i.e., DCI 1) for PDSCH scheduling (i.e., ., PDSCH 1) panel 1 in the latest slot.

5B, scheduling bias 1 is greater than the scheduling bias threshold and scheduling bias 2 is less than the scheduling bias threshold. Accordingly, the UE may assume that the PDSCH 1 DMRS port is in quasi-collocation with the reference signal in the TCI state related to the QCL type parameter given by the TCI state indicated by DCI 1. The UE may assume that the PDSCH 2 DMRS port is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the DCI (ie, DCI 1) for scheduling the PDSCH (ie, PDSCH 1) of panel 1 in the latest slot.

According to the first implementation described above, the QCL guess related to the PDSCH in the case where the scheduling offset is less than the scheduling offset threshold may be determined depending on the specific panel. By making the scheduling offset smaller than the scheduling offset threshold, one can make the QCL guess related to the PDSCH set the same.

<Second implementation>

In the second implementation, when the time offset (scheduling offset) between the reception of the downlink DCI and the receipt of the PDSCH corresponding to the specified DCI is less than the scheduling offset threshold, the UE may assume that the DMRS port of the serving cell PDSCH is in quasi-collocation with a reference signal in the TCI state related to the QCL parameter used to indicate the QCL of the PDCCH having the lowest CORESET-ID of the corresponding associated panel ID in the latest slot in which one or more CORESETs in the active serving cell BWP are configured for the specified UE.

Here, said corresponding associated panel identifier may be, for example, the panel identifier used to transmit or receive the specified PDSCH (or DCI).

Each of FIGS. 6A and 6B represents an example of guessing the QCLs of the DMRS ports of the PDSCHs according to the second implementation. Fig. 6A and 6B are identical to FIGS. 4A and 4B, respectively, except for the QCL assumption.

6A, both scheduling bias 1 and scheduling bias 2 are less than the scheduling bias threshold. Accordingly, the UE may assume that the DMRS port of PDSCH channel 1 is in quasi-colocation with the reference signal in the TCI state for the PDCCH corresponding to the lowest CORESET-ID of panel 1 (panel for PDSCH 1) in the latest slot. The UE may assume that the DMRS port of the PDSCH 2 is in quasi-colocation with the reference signal in the TCI state for the PDCCH corresponding to the lowest CORESET-ID of panel 2 (the panel for PDSCH 2) in the latest slot.

6B, scheduling bias 1 is greater than the scheduling bias threshold and scheduling bias 2 is less than the scheduling bias threshold. Accordingly, the UE may assume that the PDSCH 1 DMRS port is in quasi-collocation with the reference signal in the TCI state related to the QCL type parameter given by the TCI state indicated by DCI 1. The UE may assume that the PDSCH 2 DMRS port is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the lowest CORESET-ID of panel 2 (the panel for PDSCH 2) in the latest slot.

Note that, as a modification of the second implementation, it may be assumed that the DMRS port of the PDSCH of the serving cell is in quasi-collocation with the reference signal in the TCI state related to the QCL parameter used for the PDCCH to schedule the PDSCH having the corresponding associated Panel ID at the latest a slot in which one or more CORESETs in the active BWP of the serving cell are configured for the specified UE.

Each of figa and 7B represents an example of the assumption of QCL ports DMRS channels PDSCH according to this modification of the second implementation. Fig. 7A and 7B are the same as FIGS. 4A and 4B, respectively, except for the QCL assumption.

7A, both scheduling bias 1 and scheduling bias 2 are less than the scheduling bias threshold. Accordingly, the UE may assume that the DMRS port of PDSCH channel 1 is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the DCI (i.e., DCI 1) for scheduling the PDSCH (i.e., PDSCH 1) of panel 1 in the latest slot. The UE may assume that the DMRS port of the PDSCH channel 2 is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the DCI (i.e., DCI 2) for scheduling the PDSCH (i.e., PDSCH 2) of panel 2 at the latest slot.

7B, scheduling bias 1 is greater than the scheduling bias threshold and scheduling bias 2 is less than the scheduling bias threshold. Accordingly, the UE may assume that the DMRS port of PDSCH channel 1 is in quasi-collocation with the reference signal in the TCI state related to the QCL type parameter given by the TCI state indicated by DCI 1. The UE may assume that the DMRS port of PDSCH channel 2 is in quasi-collocation with the reference signal in the TCI state for the PDCCH corresponding to the DCI (ie, DCI 2) for scheduling the PDSCH (ie, PDSCH 2) of panel 2 in the latest slot.

According to the above-described second implementation, a QCL guess related to the PDSCH in the case where the scheduling related offset is smaller than the scheduling related offset threshold may be determined depending on the respective panel.

<Other implementations>

The first implementation may be used, for example, when at least one of the following is true:

- UE receives multiple PDCCHs (parts of DCI) or PDSCHs from one TRP;

- UE receives multiple PDCCHs (parts of DCI) or PDSCHs from multiple panels;

- TCI state of multiple TRPs or DCIs of multiple panels is assumed to be a type D QCL.

The second implementation may be used, for example, when at least one of the following is true:

- UE receives multiple PDCCHs (parts of DCI) or PDSCHs from multiple TRPs;

- UE receives multiple PDCCHs (parts of DCI) or PDSCHs from multiple panels;

- TCI state of multiple TRPs or DCIs of multiple panels is not assumed to be a type D QCL.

Note that, under the above conditions, the TCI state of the DCI information can be interpreted as at least one of the TCI enabled state, the minimum TCI state ID, the TCI state of the lowest CORESET-ID, and the like.

The QCL guess determination methods presented in the first implementation and the second implementation may be used separately depending on the condition.

Although FIGS. 4A-7B show examples with multiple PDCCHs, each implementation of the present invention may be applied to a single PDCCH. In this case, DCI 1 and DCI 2 can be interpreted as one identical part of the DCI.

For example, in FIG. 4A, when DCI 1 is absent and DCI 2 is used for scheduling PDSCH 1 and PDSCH 2, the UE may assume that both the DMRS port of PDSCH 1 and the DMRS port of PDSCH 2 are in quasi-collocation with the reference signal in the TCI state. for the PDCCH corresponding to the lowest CORESET-ID of panel 1 in the latest slot.

It should be appreciated that although each implementation of the present invention presents an example in which the reception intervals of DCI 1 and DCI 2 are the same, this is not a limitation. Each implementation of the present invention can also be applied when the reception intervals of the DCI portions of the respective panels are different.

Note that in each implementation of the present invention, scheduling shifts 1 and 2 may be the same or different.

The above explains an example in which, in each implementation of the present invention, the scheduling-related offset threshold is the same regardless of the panel. However, the scheduling offset threshold can be different depending on the panel.

The method of assigning the CORESET-ID index (indexing) can be general (global) for all panels (TRP, DMRS port groups) or can be unique for each panel (TRP, DMRS port groups).

For example, CORESET-ID=1 and 2 could correspond to DMRS port group 1, and CORESET-ID=3 and 4 to DMRS port group 2. In this case, the lowest CORESET-ID is 1. The lowest CORESET-ID of the minimum DMRS port group is 1. The lowest CORESET-ID of DMRS port group 1 is 1. The lowest CORESET-ID of DMRS port group 2 is 3.

Note that a DMRS port group may be associated for each CORESET (eg, the RRC layer information element "ControlResourceSet" may contain information about the DMRS port group). The DMRS port group configuration information may contain information about the corresponding CORESET. For example, information indicating that DMRS port group 1 corresponds to CORESET-ID=1 and 2 can be set using the configuration information of this DMRS port group.

A DMRS port group according to the present invention may comprise at least one of a PDSCH DMRS port group, a PDCCH DMRS port group, a PBCH DMRS port group, and another channel DMRS port group.

The smallest CORESET-ID according to the present disclosure of the invention can be interpreted as a specific CORESET-ID determined by definition.

<Additional implementations>

The QCL (QCL guess) applied to the PDSCH when the scheduling offset is less than the scheduling offset threshold as presented in the first implementation and the second implementation may be referred to as standard QCL (standard QCL guess).

Note that the definition of a standard QCL is not limited to the above definition. For example, the standard QCL may be QCL assumed when it is not possible to use the TCI/QCL state specified using DCI, or QCL assumed when the TCI/QCL state is not specified (or not set) for a particular channel/signal (e.g., PDSCH ).

Incidentally, in Release 15, for the UE, the number of DMRS CDM groups without data (the number of CDM groups without data), the PDSCH antenna port index (DMRS port(s)), and the like. are specified based on the antenna port field contained in the DCI (downstream DCI).

The UE may refer to different tables depending on the values of the DMRS type (which may be specified by the RRC layer parameter "dmrs-Type") and the maximum DMRS length (which may be specified by the RRC layer parameter "maxLength") specified using upper layer signaling (e.g., TS 38.212 table 7.3.1.2.2-1/2/3/4). Depending on the values of the antenna port field, the table entry to be accessed can be determined (the entry corresponds to the set of the above-described number of CDM groups, antenna port index, etc.).

At the same time, the present inventors have noticed that the above-described table, which is referred to in connection with the antenna port field according to version 15, contains one or more entries not used in NCJT (multiple PDSCH) scheduling.

In light of this, in further implementations, when multiple TRPs are scheduled using a single PDCCH, the UE may support processing in which an antenna port indication (antenna port field indication included in DCI) is performed based on a new DMRS table that is not defined in Release 15. (in other words, the entries corresponding to the antenna port field are determined by referring to the new DMRS table).

A UE supporting this processing may determine a table to be used, a DMRS table according to version 15 or a new DMRS table, based on the TCI field contained in the DCI. For example, when the TCI field indicates one TCI state, the UE may decide to use the Release 15 DMRS table, and when the TCI field indicates two or more TCI states, the UE may decide to use a new DMRS table.

Note that this processing can only be applied when multiple TRPs are scheduled using a single PDCCH.

The new DMRS table may be referred to as a table for multiple TRPs in a single PDCCH based scheme, a table for NCJT based on a single PDCCH, a table for NCJT only, a DMRS table for version 16 or later, or the like.

The specified new DMRS table may be, for example, a DMRS table that does not contain an entry specifying only one port. An entry specifying only one port may be, for example, an entry indicating that the number of DMRS CDM groups with no data is 2 and the PDSCH antenna port index is 0. In other words, a new DMRS table may be generated containing only such entries, each of which specifies two or more ports.

The specified new DMRS table may be, for example, a DMRS table that does not contain an entry indicating two or more ports in the same CDM group. An entry specifying two or more ports in one CDM group may be, for example, an entry indicating that the number of DMRS CDM groups without data is 1 and the PDSCH antenna port index is 0, 1. In other words, a new DMRS table may be formed with containing only such records, each of which defines two different CDM groups.

Preferably, when a specific DMRS type and maximum length of a specific DMRS are assumed, a new DMRS table is generated such that the antenna port field in DCI is the same size as in version 15.

A new DMRS table can be obtained by adding a new entry to the table corresponding to version 15. In this case, the size of the antenna port field in DCI may differ from this size in version 15.

[Standard QCL + New DMRS Table] In addition to the TCI field or instead of the TCI field, the UE may determine the table to be used, the Release 15 DMRS table or the new DMRS table, based on the above-described standard QCL. For example, when the standard QCL indicates one QCL, the UE may decide to use the Release 15 DMRS table, and when the standard QCL indicates two or more QCLs, the UE may decide to use the new DMRS table described above.

Note that the PDSCH with which the UE assumes standard QCL may be the PDSCH when the upper layer parameter "tCI-PresentInDCI" is not set, or the PDSCH when the scheduling offset is less than the scheduling offset threshold. , as described in the above implementations. In the latter case, the standard QCL is assumed regardless of whether the upper layer parameter "tCI-PresentInDCI" is set.

The UE may determine the number of QCL options corresponding to (or specified for) the standard QCL based on at least one of the following:

- a set of search spaces (eg, type of search space) in which a DCI (scheduling DCI) is adopted for PDSCH scheduling;

- CORESET (eg, CORESET index or CORESET resource position) in which the DCI for PDSCH scheduling is received; And

- a given field (eg, TCI field) in the DCI for PDSCH scheduling. For example, the UE, having received the scheduling DCI in the first set of spaces

search space (eg, in a given total set of search spaces) may assume that the standard QCL of a PDSCH scheduled using the specified DCI is known to correspond to one QCL.

The UE, upon receiving a scheduling DCI in a first search space set (eg, a UE-specific search space set), may assume that the standard QCL of a PDSCH scheduled using said DCI corresponds to two or more QCLs.

A UE, upon receiving a scheduling DCI at a particular CORESET (eg, at CORESET 0 (in CORESET with index 0), may assume that the standard QCL of a PDSCH scheduled using the specified DCI is known to correspond to one QCL.

The UE, upon receiving a scheduling DCI in a CORESET other than a specific CORESET, may assume that the standard QCL of a PDSCH scheduled using the specified DCI corresponds to two or more QCLs.

Note that when multiple TRPs are scheduled using a single PDCCH (single DCI), the UE may assume that the upper layer parameter "tCI-PresentInDCI" is configured to be true. Even if it matches the standard QCL, the UE can determine whether the scheduled PDSCH matches a single TRP (the number of specified TCI states is one) or multiple TRPs (the number of specified TCI states is two or more) based on the TCI field in the DCI.

The UE, upon receiving the DCI and determining that the scheduling offset is less than the scheduling offset threshold, may receive the PDSCH according to the standard QCL. The UE may determine whether to use the new DMRS table to receive the PDSCH based on the TCI field in the DCI and may control the decoding of the indicated PDSCH.

When the upper layer parameter "tCI-PresentInDCI" is configured to be true, the UE may assume that the scheduled PDSCH is multiple PDSCHs. When the upper layer parameter "tCI-PresentInDCI" is not configured to be true, the UE may assume that the scheduled PDSCH is a single PDSCH (PDSCH from a single TRP). In other words, the UE may be configured semi-statically according to whether the PDSCH matches a single TRP or multiple TRPs.

According to the additional implementations described above, the UE may dynamically change the TCI state/QCL guess of a single TRP and multiple TRPs. The UE may appropriately use different DMRS tables depending on whether multiple TRPs are used.

It should be noted that the table according to the present disclosure may be interpreted as a correspondence relationship based on the table. In other words, the UE may determine the corresponding entries based on the values of the antenna port field using a matching relationship similar to a table, but without storing the table as such.

(Radio communication system)

The following describes the configuration of a radio communication system in accordance with one implementation of the present invention. In this radio communication system, any of the radio communication methods according to the respective above-described implementations of the present invention may be used for communication individually or in combination.

Fig. 8 represents an example of a generalized configuration of a radio communication system in accordance with one implementation. The radio communication system 1 may be a system capable of communicating using LTE, a new 5G radio system (5G NR) and the like, the specifications of which are proposed by the 3rd Generation Network Partnership (3GPP).

The radio communication system 1 is configured to support dual connection between a plurality of Radio Access Technologies (RAT) (Multi-RAT Dual Connectivity, MR-DC)). MR-DC may include a dual connection between LTE (Evolved Universal Terrestrial Radio Access, E-UTRA)) (E-UTRA-NR dual connection, E-UTRA-NR Dual Connectivity, EN- DC)) and NR, dual connection (NR-E-UTRA dual connection, NR-E-UTRA Dual Connectivity, NE-DC) between NR and LTE, etc.

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

The radio communication system 1 can support dual connection between multiple base stations in one RAT (eg, dual connection (NN-DC (NR-NR dual connection)) in which both MNs and SNs are base stations (gNBs) of the NR system).

The radio communication system 1 may include a base station 11 forming a macro cell C1 with a relatively wide coverage, and base stations 12 (12a-12c) located in the macro cell C1 and forming small cells C2 with less coverage than that of the macro cell C1. The user terminal 20 may be located in at least one cell. Placement, quantity, etc. cells and user terminal 20 is not limited in any way to the aspect shown in the diagram. Hereinafter, base stations 11 and 12 are collectively referred to as base stations 10 unless otherwise indicated.

The user terminal 20 may be connected to at least one base station from a plurality of base stations 10. The user terminal 20 may implement at least one of carrier aggregation and dual connection (CC) using multiple elementary carriers (EC).

Each EN can be included in at least one range from the first frequency range (eng. Frequency Range 1, FR1)) and the second frequency range (FR2). Macro cell C1 may refer to FR1 and small cells C2 may refer to FR2. For example, the FR1 band may be 6 GHz and below, and the FR2 band may be above 24 GHz. Please note that frequency ranges, definitions, etc. FR1 and FR2 are not limited in any way, and, for example, FR1 may correspond to a frequency range above FR2.

The user terminal 20 is configured to communicate using at least one of a Time Division Duplex (TDD) and a Frequency Division Duplex (FDD) on each EN.

The plurality of base stations 10 may be connected by a wired connection (for example, a fiber optic cable in accordance with the Common Public Interface (CPRI) standard, an X2 interface, etc.) or a wireless connection (for example, NR communication) . For example, if NR is used as the reverse connection between base stations 11 and 12, base station 11 corresponding to the older station may be called an IAB donor (Eng. Integrated Access and Backhaul, combined access and reverse connection, IAB), and base station 12 , the corresponding relay station can be called an IAB node.

Base station 10 may be connected to core network 30 through another base station 10 or directly. For example, core network 30 may comprise at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core, NGC), etc.

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

The radio communication system 1 may use a wireless access scheme based on orthogonal frequency division multiplexing (OFDM). For example, at least one of the downlink (downlink, DL) and uplink (uplink, UL) can use OFDM with a cyclic prefix (eng. Cyclic Prefix OFDM, CP-OFDM), OFDM with spread spectrum on based on the discrete Fourier transform (Eng. Discrete Fourier Transform Spread OFDM, DFT-s-OFDM), multiple access with orthogonal frequency division (Eng. Orthogonal Frequency Division Multiple Access, OFDMA), multiple access on a single carrier with division in frequency .Single Carrier Frequency Division Multiple Access, SC-FDMA), etc.

The wireless access scheme may be referred to as a "signal type". Note that in the radio communication system 1, a different wireless access scheme (eg, different single carrier transmission scheme, different multi-carrier transmission scheme) may be used as the wireless access scheme in the uplink and downlink.

In the radio communication system 1, a downlink common channel (Physical Downlink Shared Channel, PDSCH), which is shared by all user terminals 20, a broadcast channel (Physical Broadcast Channel, Physical Broadcast Channel, Strategic Missile Forces), downlink control channel, etc.

In the radio communication system 1, uplink channels can be used as an uplink shared channel (Physical Uplink Shared Channel, PUSCH) shared by all user terminals 20, an uplink control channel (Physical Uplink Control Channel, Eng. Physical Uplink Control Channel, PUCCH), random access channel (Physical Random Access Channel, PRACH), etc.

The PDSCH carries user data, higher layer control information, System Information Blocks (SIBs), and so on. User data, higher level control information, etc. may be transmitted on the PUSCH. In the RVSN channel, blocks of basic information (eng. Master Information Block, MIB) can be transmitted.

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

Note that the DCI for PDSCH scheduling may be referred to as downstream allocation, downstream DCI, and the like, and the DCI for PUSCH scheduling may be referred to as upstream grant, upstream DCI, and the like. Note that PDSCH may be interpreted as downstream data and PUSCH may be interpreted as upstream data.

A control resource set (CORESET) and a search space may be used for PDCCH discovery. CORESET corresponds to a resource for DCI lookup. The search space corresponds to the search area and the search method for candidate PDCCHs. One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with the given search space based on the search space configuration.

One synchronization signal (SS) may correspond to a candidate PDCCH corresponding to one or more levels of aggregation. One or more search spaces may be referred to as a "multiple search spaces". Note that "search space", "search space plurality", "search space configuration", "search space plurality configuration", "CORESET", "CORESET configuration", etc. in the present disclosure, the inventions may be interpreted interchangeably.

Channel State Information (CSI), transmission acknowledgment information (which, for example, may also be called a hybrid automatic repeat reQuest (HARQ-ACK), ACK/NACK, etc. .), Scheduling Request (SR), etc. may be transmitted via PUCCH. Random access preambles can be sent over the PRACH to establish connections with cells.

It should be appreciated that in the present disclosure, downlink, uplink, etc. can be called without using the term "line". In addition, different channels can be named without adding the word "physical" at the beginning.

In the radio communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like can be transmitted. In the radio communication system 1, as a downlink reference signal (English Downlink Reference Signal, DL-RS), an individual cell-specific reference signal (English Cell-Specific Reference Signal, CRS), a reference signal of information about the channel state (English Channel State Information Reference Signal (CSI-RS), Demodulation Reference Signal (DMRS), Positioning Reference Signal (PRS), Phase Tracking Reference Signal (PTRS) etc.

Said synchronization signal may be at least one of, for example, a primary synchronization signal (Primary SS, PSS) and a secondary synchronization signal (Secondary SS, SSS). A signal block containing an SS (PSS, SSS) and a PBCH (and a DMRS for the PBCH) may be referred to as an SS/PBCH block, an SS block (SSB), and so on. Please note that SS, SSB, etc. may also be referred to as a reference signal.

Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. can be transmitted as the uplink reference signal (UL-RS) in the radio communication system 1. Note that DMRS may be referred to as a user terminal-specific reference signal (UE-specific reference signal).

(Base station)

Fig. 9 shows an example of a base station configuration according to one implementation. The base station 10 includes a control section 110, a transmit/receive section 120, transmit/receive antennas 130, and a transmission line interface 140. Note that base station 10 may include one or more control sections 110, one or more transmit/receive sections 120, one or more transmit/receive antennas 130, and one or more transmission line interfaces 140.

It should be noted that the base station 10, in addition to the functional blocks presented in this example, related to parts important for this implementation, may contain other functional blocks that are also necessary for radio communication. Part of the operations of each of the sections described below may be omitted.

The control section 110 is configured to control the base station 10 as a whole. The control section 110 may be formed by a controller, a control circuit, or the like, well known in the art to which the present invention pertains.

The control section 110 is configured to control signal generation, scheduling (eg, resource allocation, mapping), and the like. The control section 110 is configured to control transmission and reception, measurement, and the like, which are performed using the transmission/reception section 120, the transmit/receive antennas 130, and the transmission line interface 140. The control section 110 is configured to generate data, control information, sequence, and the like. to transmit as a signal, and transmit the formed elements to the transmission/reception section 120. The control section 110 is configured to call processing (set up, release) for communication channels, control the state of the base station 10, and control radio resources.

The transmission/reception section 120 may include a baseband section 121, a radio frequency (Radio Frequency, RF) section 122, and a measurement section 123. Section 121 of the base band may contain section 1211 processing for transmission and section 1212 receiving processing. The transmit/receive section 120 may be formed by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmit/receive circuit, or the like, well known in the art to which the present invention pertains.

The transmit/receive section 120 may be organized as a single transmit/receive section, or may contain a transmit section and a receive section. The transmission section may be formed by the transmission processing section 1211 and the RF section 122. The reception section may be formed by the reception processing section 1212, the RF section 122, and the measurement section 123.

The transmit/receive antennas 130 may be formed by antennas, such as a multi-element antenna or the like, well known in the art to which the present invention pertains.

The transmit/receive section 120 is configured to transmit the above-described downlink, synchronization signal, downlink reference signal, and the like. The transmit/receive section 120 is configured to receive the above-described uplink, uplink reference, and the like.

The transmit/receive section 120 is configured to generate at least one of a transmit beam and a receive beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), and the like.

The transmission/reception section 120 (transmission processing section 1211) is configured to perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing, such as control retransmission at the RLC layer), media access layer (MAC) processing, such as HARQ retransmission control), etc., for example, on data and control information, etc. obtained from the control section 110, and with the possibility of forming a string of bits for transmission.

The transmission/reception section 120 (transmission processing section 1211) is configured to perform processing for transmission, such as channel coding (which may include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT) processing (if necessary). ), inverse fast Fourier transform (IFFT), precoding, digital-to-analog conversion, and the like. over the specified sequence of bits to transmit, and with the possibility of issuing a baseband signal.

The transmit/receive section 120 (RF section 122) is configured to perform RF modulation, filtering, amplification, and so on. above the baseband signal and with the possibility of transmitting an RF signal through the transmit/receive antennas 130.

In addition, the transmit/receive section 120 (RF section 122) is configured to perform amplification, filtering, demodulation to baseband signal, etc., on the RF signal received by the transmit/receive antennas 130.

The transmit/receive section 120 (receive processing section 1212) is configured to apply receive processing such as A/D conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, inverse mapping , demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc., to the received baseband signal, and with the possibility of obtaining user data, etc.

The transmission/reception section 120 (measurement section 123) is configured to perform a measurement related to the received signal. For example, the measurement section 123 can perform a measurement in Radio Resource Management (RRM), a measurement to obtain Channel State Information (CSI), and so on, based on the received signal. The measurement section 123 can measure reception power (for example, Reference Signal Received Power, RSRP), reception quality (for example, Reference Signal Received Quality, RSRQ), signal-to-sum ratio interference and noise (Signal to Interference plus Noise Ratio, SINR), signal-to-noise ratio (Signal to Noise Ratio, SNR), signal strength (for example, Received Signal Strength Indicator, RSSI) ), channel state information (eg, CSI), etc. The measurement results may be transmitted to the control section 110 .

The transmission line interface 140 is configured to perform signal transmission/reception (reverse connection signaling) with a device included in the core network 30 or other base stations 10, etc., and capable of receiving or transmitting user data (user plane data) , control plane data, etc. for user terminal 20.

Note that the transmission section and the reception section of the base station 10 in the present invention may be formed by at least one of the transmission/reception section 120, the transmission/reception antennas 130, and the transmission line interface 140.

Note that the transmit/receive section 120 is configured to transmit multiple PDSCHs to user terminal 20 using multiple panels. The transmit/receive sections 120 of the plurality of base stations 10 are configured to transmit to the user terminal 20 a plurality of PDSCHs.

The control section 110 is configured to perform processing for transmission such that, with respect to each PDSCH, when the time offset between the reception of the corresponding downlink control information (DCI) and the reception of the specified PDSCH is less than a predetermined threshold, the DMRS port of the PDSCH (PDSCH) of the serving cell is in quasi-collocation with the reference signal in the TCI state related to the QCL parameter used to indicate the QCL for the PDCCH having the lowest CORESET-ID of the given panel ID in the latest slot in which one or more CORESETs are configured for the user terminal 20 in the active BWP of the serving cell .

Note that this given panel ID can be a minimum or maximum panel ID. This given panel ID may be a corresponding associated panel ID (eg, the panel ID of the base station 10 used for the specified PDSCH).

The above-described PDCCH having the lowest CORESET-ID may be the PDCCH for PDSCH scheduling (may be limited). The above-described QCL parameter used to indicate the QCL for the PDCCH having the lowest CORESET-ID can be interpreted as the QCL parameter used for the PDCCH to schedule the PDSCH.

(User terminal)

Fig. 10 represents an example of a user terminal configuration according to one implementation. The user terminal 20 includes a control section 210, a transmit/receive section 220, and transmit/receive antennas 230. It should be noted that the user terminal 20 may include one or more control sections 210, one or more transmit/receive sections 220, and one or more transmit/receive antennas. receiving antennas 230.

It should be noted that the user terminal 20, in addition to the functional blocks presented in this example, related to parts important for this implementation, may contain other functional blocks that are also necessary for radio communication. Part of the operations of each of the sections described below may be omitted.

The control section 210 is configured to control the user terminal 20 as a whole. The control section 210 may be formed by a controller, control circuit, or the like, well known in the art to which the present invention pertains.

The control section 210 is configured to control signal generation, display, and so on. The control section 210 is configured to control transmission/reception, measurement, and the like. using the transmission/reception section 220 and the transmission/reception antennas 230. The control section 210 is configured to generate data, control information, a sequence, and the like to be transmitted as a signal, and to transmit the generated elements to the transmission/reception section 220 .

The transmit/receive section 220 may include a baseband section 221, an RF section 222, and a measurement section 223. Section 221 of the base band may contain section 2211 processing for transmission and section 2212 receiving processing. The transmit/receive section 220 may be formed by a transmitter/receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmit/receive circuit, or the like, well known in the art to which the present invention pertains.

The transmit/receive section 220 may be organized as a single transmit/receive section, or may contain a transmit section and a receive section. The transmission section may be formed by the transmission processing section 2211 and the RF section 222. The reception section may be formed by the reception processing section 2212, the RF section 222, and the measurement section 223.

The transmit/receive antennas 230 may be formed by antennas, such as a multi-element antenna or the like, well known in the art to which the present invention pertains.

The transmission/reception section 220 is configured to receive the above-described downlink, synchronization signal, downlink reference signal, and the like. The transmission/reception section 220 is configured to transmit the above-described uplink, uplink reference signal, and the like.

The transmit/receive section 220 is configured to generate at least one of a transmit beam and a receive beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), and the like.

The transmission/reception section 220 (transmission processing section 2211) is configured to perform PDCP layer processing, RLC layer processing such as RLC layer retransmission control, MAC layer processing (for example, HARQ retransmission control), and so on. , for example, on the data and control information, etc. obtained from the control section 210, and with the possibility of generating a bit sequence for transmission.

The transmission/reception section 220 (transmission processing section 2211) is configured to perform processing for transmission, such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, digital-to-analogue conversion, etc. over the specified sequence of bits to transmit, and with the possibility of issuing a baseband signal.

It should be appreciated that the decision to apply or not to apply DFT processing may be made based on the transform precoding configuration. The transmit/receive section 220 (transmit processing section 2211) is configured to perform DFT processing for a specific channel (eg, PUSCH) as the above-described transmit processing to transmit said channel using a DFT-s-OFDM scheme if precoding is enabled. with the transformation, and with the possibility of not performing the DFT processing as the above processing for transmission otherwise.

The transmit/receive section 220 (RF section 222) is configured to perform RF modulation, filtering, amplification, and so on. above the baseband signal and capable of transmitting the RF signal through the transmit/receive antennas 230.

In addition, the transmit/receive section 220 (RF section 222) is configured to perform amplification, filtering, demodulation to baseband signal, etc., on the RF signal received by the transmit/receive antennas 230.

The transmit/receive section 220 (receive processing section 2212) is configured to apply receive processing, e.g. ), MAC layer processing, RLC layer processing, and PDCP layer processing, etc., to the received baseband signal, and with the possibility of obtaining user data, etc.

The transmission/reception section 220 (measurement section 223) is configured to perform a measurement related to the received signal. For example, the measurement section 223 may, based on the received signal, perform measurements in radio resource management (RRM), CSI measurement, and so on. Measurement section 223 may measure receive power (eg, RSRP), reception quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel state information (eg, CSI), and the like. The measurement results may be transmitted to the control section 210 .

Note that the transmission section and the reception section of the user terminal 20 in the present invention may be formed by at least one of the transmission/reception section 220, the transmission/reception antennas 230, and the transmission line interface 240.

Note that the transmit/receive section 220 is configured to receive multiple PDSCHs. This set of PDSCHs may be transmitted from different TRPs (different base stations 10) or from different panels.

The control section 210 is configured to assume that, with respect to each PDSCH, when the time offset between the reception of the corresponding downlink control information (DCI) and the reception of the specified PDSCH is less than a predetermined threshold, the DMRS port of the PDSCH (PDSCH) of the serving cell is in quasi-collocation with a reference signal in the TCI state related to the QCL parameter used to indicate the QCL for the PDCCH having the lowest CORESET-ID of the given panel ID in the latest slot in which one or more CORESETs are configured for the user terminal 20 in the active BWP of the serving cell. The control section 210 is configured to perform PDSCH receive processing based on the specified assumption.

Note that this given panel ID can be a minimum or maximum panel ID. This given panel ID may be a corresponding associated panel ID (eg, the panel ID of the base station 10 used for the specified PDSCH). When this given panel ID is equal to the corresponding associated panel ID, the specified set of PDSCHs may be assumed to have been transmitted from different TRPs.

The above-described PDCCH having the lowest CORESET-ID may be the PDCCH for PDSCH scheduling (may be limited). The above-described QCL parameter used to indicate the QCL for the PDCCH having the lowest CORESET-ID can be interpreted as the QCL parameter used for the PDCCH to schedule the PDSCH.

The transmit/receive section 220 is configured to receive a downlink common channel (Physical Downlink Shared Channel (PDSCH)) based on one piece of downlink control information (single PDCCH, one integral DCI). The specified PDSCH may be a plurality of PDSCHs or a single PDSCH.

The control section 210 is configured to determine the number of standard quasi-colocation (QCL) options to apply to the PDSCH based on the specified downstream control information.

The control section 210 is configured to determine the number of standard QCLs based on a predetermined field (eg, TCI field) contained in said downstream control information.

The control section 210 is configured to determine the number of standard QCLs based on the plurality of search spaces in which said downstream control information is received.

The control section 210 is configured to determine the number of standard QCLs based on the control resource set (CORESET) in which the specified downstream control information is received.

The control section 210 is configured to control the reception of the downlink common channel based on a different matching relation than the matching when the number of standard QCLs is one (eg, based on the new DMRS table) when the number of standard QCLs is two or more.

(Hardware configuration)

In the functional diagrams used to describe the above implementations, blocks are shown in functional modules. These functional blocks (components) can be implemented by arbitrary combinations of at least one of the hardware and/or software. Here, the implementation method of each function block is not specifically limited. In other words, each functional block may be implemented by a single physically or logically connected device, or may be implemented by directly or indirectly connecting two or more physically or logically separate devices (via, for example, a wired, wireless connection, or the like) and using this set of devices. These functional blocks can be implemented by combining the above described software with one or more of the above devices.

Here, the functions include analysis, definition, decision making, calculation, calculation, processing, inference, research, search, confirmation, reception, transmission, output, access, disambiguation, selection, indication, establishment, comparison, assumption, assumption, consideration, broadcast, notification, message, forwarding, setting, reconfiguring, hosting (display), assigning, etc., but these functions are by no means limited to the above list. For example, the functional block(s) for realizing the transmission function may be called a transmission section (transmission unit), a transmitter, or the like. The implementation method of each component is not specifically limited to the above.

base station, user terminal, etc. in accordance with one implementation of the present invention may function, for example, as a computer executing the operations of the radio communication method of the present invention. Fig. 11 shows an example of a hardware configuration of a base station and a user terminal according to one implementation. Physically, the base station 10 and user terminal 20 described above may be implemented 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 so on.

In this disclosure, words such as "hardware", "circuit", "device", "section", "module", etc. can be interpreted interchangeably. The hardware configuration of the base station 10 and the user terminal 20 may contain one or more of each of the devices shown in the drawings, or may not contain a part of these devices.

For example, although only one processor 1001 is shown, multiple processors may be provided. The operations may be performed by a single processor or by two or more processors simultaneously, sequentially, or otherwise. It should be appreciated that processor 1001 may be implemented using one or more integrated circuit chips.

Each functional module of base station 10 and user terminals 20 is implemented, for example, by enabling certain software(s) to be read into hardware, for example, into processor 1001 and into memory 1002, and by enabling processor 1001 to perform calculations to control communication through the communication device 1004 and the ability to control the reading and/or writing of data to the memory 1002 and the storage device 1003.

The processor 1001 is configured to control the entire computer by, for example, executing an operating system. The processor 1001 may be configured to include a central processing unit (CPU) including interfaces with a peripheral device, a control device, a computing device, a register, and so on. The processor 1001 may implement, for example, at least a portion of the above-described control section 110 (210), transmit/receive section 120 (220), and the like.

Further, the processor 1001 is configured to read programs (program codes), program modules, data, and so on. from the storage 1003 and/or the communication device 1004 to the memory 1002 and perform various operations in accordance therewith. With regard to these programs, programs that implement the ability of a computer to perform at least part of the operations of the above implementations can be used. For example, control section 110 (210) may be implemented by program codes stored in memory 1002 and executed by processor 1001; other functional blocks can be implemented similarly.

Memory 1002 is a computer-readable, writable storage medium and may be formed using, for example, at least one of the following devices: read-only memory (ROM), erasable and programmable read-only memory (EPROM), electrically erasable and programmable read-only memory ( EEPROM), Random Access Memory (RAM), and other suitable storage media. Memory 1002 may be referred to as a register, cache, main memory (main storage), and so on. The memory 1002 is configured to store executable programs (program codes), program modules, and the like. to implement a radio communication method according to an embodiment of the present invention.

The storage device 1003 is a machine-readable writable medium and can be implemented using, for example, at least one of a floppy disk, a floppy disk (a registered trademark of floppy disk), a magneto-optical disk (for example, a Compact Disc ROM, CD-ROM), etc.), Digital Versatile Disc, Blu-ray Disc (registered trademark), removable disk, hard disk, smart card, flash memory device (such as , memory card, removable storage, removable disk, etc.), magnetic tape, database, server, and other suitable media. The storage device 1003 may be referred to as an additional storage device.

Communication device 1004 is a hardware (transmitter/receiver) for computer-to-computer communication via wired and/or wireless networks, and may be referred to as a network device, network controller, network card, communication module, etc., for example. The communication device 1004 may be configured to include a high frequency switch, an antenna switch, a filter, a frequency synthesizer, and so on. in order to implement, for example, frequency division duplex (FDD) and/or time division duplex (TDD). For example, the above-described transmit/receive sections 120 (220), transmit/receive antennas 130 (230), etc. can be implemented by the communication device 1004. In the transmit/receive section 120 (220), the transmit section 120a (220a) and the receive section 120b (220b) may be implemented with physical or logical separation.

The input device 1005 is a device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) for receiving information from outside. The output device 1006 is an output device (eg, display, acoustic emitter, LED indicator, etc.) for outputting information. It should be noted that the input device 1005 and the output device 1006 may be combined into a single structure (eg, a touch panel).

Devices of these types, including processor 1001, memory 1002, etc., are connected by bus 1007 to exchange information. Bus 1007 may be formed by a single bus or buses that differ from device to device.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (ASIC), a programmable logic device (English Programmable Logic Device, PLD), programmable matrix of logical elements (English Field Programmable Gate Array, FPGA), etc., and all or part of the functional blocks can be implemented by the specified hardware. For example, processor 1001 may be implemented by at least one of these hardware.

(Modifications)

It should be appreciated that the terms described in the disclosure of the present invention and the terms necessary for understanding the present invention may be replaced by other terms conveying the same or similar meaning. For example, "channel", "symbol", and "signal" (or signaling) can be interpreted interchangeably. In addition, "signals" can be "messages". The reference signal can be abbreviated as RS (Reference Signal) and called pilot, pilot signal, etc. depending on the applicable standard. A Elementary Carrier (EC) may be referred to as a cell, a frequency carrier, a frequency carrier, and so on.

A radio frame may be formed from one or more periods (frames) in the time domain. Each of one or more periods (frames) constituting a radio frame may be referred to as a subframe. Further, a subframe in the time domain may be formed from one or more slots. A subframe may be a time slot of a fixed duration (eg, 1 ms) independent of numerology.

In this context, numerology may refer to a communication parameter applied to at least one of the transmission and reception of a given signal or channel. For example, the numerology may indicate at least one of Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing. performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and so on.

A slot in the time domain may be formed from one or more symbols (OFDM symbols, SC-FDMA symbols, etc.). The slot can be a temporary element depending on numerology.

A slot may contain a plurality of mini-slots. Each mini-slot in the time domain may be formed from one or more symbols. A mini-slot may be referred to as a sub-slot. A mini-slot may be formed from symbols whose number is less than the number of symbols in the slot. PDSCH (or PUSCH) transmission in a tile larger than a mini-slot may be referred to as PDSCH Mapping Type A (PUSCH). PDSCH (or PUSCH) transmission using a mini-slot may be referred to as PDSCH Map Type B (PUSCH).

The radio frame, subframe, slot, mini-slot, and symbol are temporary elements in signaling. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other suitable names. It should be appreciated that temporal elements such as frame, subframe, slot, mini-slot, and symbol may be interpreted interchangeably in the present disclosure.

For example, one subframe, multiple consecutive subframes, one slot, or one mini-slot may be referred to as a transmission time interval (TTI). Thus, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1 to 13 symbols), or a period longer than 1 ms. Note that an element representing a TTI may not be referred to as a subframe, but as a slot, mini-slot, or the like.

In this document, TTI is understood to mean, for example, the smallest scheduling time element in a radio communication. For example, in LTE systems, the base station schedules the allocation of radio resources (eg, frequency band and transmission power allowed for use by each user terminal) to the user terminal in units of TTI. The definition of TTI intervals is not limited to this.

The TTIs may be time units for transmitting channel-encoded data packets (transport blocks), code blocks, or codewords, or the TTI may be a processing time unit in scheduling, link adaptation, and so on. It should be appreciated that even with given TTIs, the time interval (eg, number of symbols) for which transport blocks, code blocks and/or codewords are actually mapped may be shorter than these TTIs.

Note that when a TTI is referred to as one slot or one mini-slot, the minimum time element in scheduling may be one or more such TTIs (ie, one or more slots or one or more mini-slots). Moreover, the number of slots (number of mini-slots) constituting this minimum scheduling time element can be controllable.

A TTI with a time duration of 1 ms may be called a regular TTI (TTI in 3GPP Releases 8-12), long TTI, regular subframe, long subframe, slot, and so on. A TTI that is shorter than a regular TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a subslot, a slot, and the like.

Note that a long TTI (e.g., regular TTI, subframe, etc.) may be interpreted as a TTI with a time duration greater than 1 ms, and a short TTI (e.g., shortened TTI) may be interpreted as a TTI with a duration shorter than the duration of the long TTI and not less than 1 ms.

Resource block (English Resource Block, RB), which is a resource allocation element in the time domain and in the frequency domain, may contain one subcarrier or multiple subcarriers in succession in the frequency domain. The number of subcarriers in a resource block may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers in resource blocks may be determined based on the numerology.

In the time domain, a resource block may contain one symbol or multiple symbols, and may be one slot, one mini-slot, one subframe, or one TTI in length. One TTI, one subframe, etc. may be formed by a single resource block or multiple resource blocks.

It should be noted that one or more resource blocks can be called a physical resource block (eng. Physical RB, PRB), a sub-carrier group (eng. Sub-Carrier Group, SCG), a group of resource elements (eng. Resource Element Group, REG), a pair PRB, a pair of resource blocks, and the like.

Further, a resource block can be formed by one resource element (English Resource Element, RE) or multiple REs. For example, one RE may correspond to a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP; may also be referred to as a partial band, etc.) may be a subset of consecutive uninterrupted common resource blocks (RB) for a given numerology on a given carrier. In this case, the common RB may be indicated by the RB index with respect to the common reference point of that carrier. The PRB may be defined in a particular BWP and may be numbered in that BWP.

The BWP may comprise an uplink BWP (UL BWP) and a downlink BWP (DL BWP). One or multiple BWPs may be configured for a UE on a single carrier.

At least one of the configured BWPs may be active and the UE may assume that the given signal/channel is not transmitted/received outside of the active BWPs. It should be noted that the terms "cell", "carrier", etc. in this disclosure may be interpreted as "BWP".

It should be appreciated that the above-described configurations of radio frames, subframes, slots, mini-slots, symbols, etc. are only examples. For example, various changes are possible with respect to the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots contained in a slot, the number of symbols and RBs contained in a slot or mini-slot, the number of subcarriers contained in a RB, number of symbols in TTI, symbol duration, cyclic prefix (CPU) length, etc.

The information and parameters described in this disclosure may be represented by absolute values or relative values with respect to setpoints, or may be represented by other relevant information. For example, the radio resources may be indicated by predetermined indexes.

Names used for parameters, etc. in the present disclosure are not limiting in any respect. Mathematical expressions using these parameters and the like may differ from those expressly disclosed in the present disclosure. For example, since the various channels (Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), etc.) and information elements may be referred to by any suitable names, the various names assigned to these individual channels and information elements are in no way relation are not limiting.

The information, signals, etc. described in this disclosure may be represented using a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, code sequences (chips), etc. that may be encountered in this disclosure may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination of the above.

Information, signals, etc. may be transmitted from higher layers to lower layers and/or from lower layers to higher layers. Information, signals, etc. may be transmitted and/or received through a plurality of network nodes.

Received and/or transmitted information, signals, etc. may be stored in a specific location (eg, in memory), or they may be stored using a control table. Information, signals, etc. to be received and/or transmitted may be overwritten, updated or supplemented. Transmitted information, signals, etc. can be removed. Received information, signals, etc. can be transferred to another device.

The communication of information is in no way limited to the aspects/implementations described in this disclosure, and other methods may be used. For example, the communication of information in the present invention can be performed by using physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), upper layer signaling (e.g., radio resource control (RRC) layer signaling), broadcast information (Basic Information Block (MIB), System Information Blocks (SIB), etc.), Media Access Layer (MAC) signaling, other signals, and/or combinations thereof.

The physical layer signaling may be referred to as L1/L2 control information (L1/L2 control signals) (Layer 1/Layer 2, layer 1/layer 2), L1 control information (L1 control signal), etc. The RRC layer signaling may be referred to as an RRC message, and the signaling may be, for example, an RRC connection establishment message, an RRC connection reconfiguration message, and so on. MAC layer signaling can be transmitted using, for example, MAC control elements (MAC CE).

The message of the given information (eg, the message that X does not change) need not be communicated explicitly, but may be communicated implicitly (by, for example, not reporting this given information or by reporting other information).

Tests can be performed on values represented by a single bit (0 or 1), on boolean values representing true or false, or by comparing numeric values (for example, by comparing with a given value).

Software, whether called a program, internal program, middleware, microcode, hardware description language or otherwise, should be interpreted broadly to refer to instructions, instruction sets, code, code segments, program codes , programs, subroutines, program modules, applications, application programs, software packages, objects, executable files, threads of execution, procedures, functions, etc.

Programs, commands, information, etc. can be transmitted and received over the communication medium. For example, if a program is transmitted from a website, server, or other remote source using at least one of the wired technologies (coaxial cables, fiber optic cables, twisted pair cables, Digital Subscriber Lines, DSL) etc.) and wireless technical means (infrared radiation, microwaves, etc.), then at least one of these wired and/or wireless technical means is also included in the concept of a communication medium.

The terms "system" and "network" as used in this disclosure may be used interchangeably. "Network" may mean a device (eg, a base station) that is part of a network.

In this disclosure, terms such as, for example, "precoding", "device for precoding", "weight (weight in precoding)", "quasi-co-location" (English Quasi-Co-Location, QCL), "indicator status transmission configuration" (TCI status), "spatial relationship", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "level", "number of levels", " rank, resource, resource set, resource group, beam, beamwidth, beam angle, antenna, antenna element, panel, etc. can be used interchangeably.

In this disclosure, terms such as "base station (eng. Base Station, BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)" , “access point”, “transmission point” (eng. Transmission Point, TP), “reception point” (eng. Reception Point, RP), “transmission / reception point” (eng. Transmission / Reception Point, TRP), “ panel, cell, sector, cell group, carrier, elementary carrier, etc. can be used interchangeably. The base station may be referred to by terms such as "macro cell", "small cell", "femto cell", "pico cell", etc., for example.

The base station may be configured to serve one or more (eg, three) cells. When a base station serves many cells, the entire coverage area of that base station can be divided into many smaller areas, in each of which communication services can be provided through subsystems of the base station, for example, small base stations for premises (remote radio units, English Remote Radio Head ). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or a subsystem of a base station providing communication services in that coverage area.

In the present disclosure, the terms "mobile station" (English Mobile Station, MS), "user terminal", "user device (UE)" and "terminal" can be used interchangeably.

A mobile station may be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote unit, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, telephone handset, user agent, mobile client, client, or, in some cases, other appropriate terms.

At least one of the base station and the mobile station may be called a transmitter, a receiver, a radio communication device, and so on. It should be appreciated that at least one of the base station and the mobile station may be a device mounted on a mobile unit, the mobile unit itself, and so on. The specified moving object can be a vehicle (for example, a car, an airplane, etc.), a moving object, the movement of which is carried out without a pilot on board (for example, a drone, a car without a driver, etc.) or a robot (controlled by human type or unmanned type). It should be appreciated that at least one of the base station and the mobile station also 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 or the like.

The base station in the present disclosure can be interpreted as a user terminal. For example, each aspect/implementation of the present invention, instead of a configuration in which communication is carried out between a base station and a user terminal, can be applied to a configuration in which communication is carried out between a plurality of user terminals (for example, this type of communication may be called device communication). -to-Device, D2D), communication between a vehicle and a wide range of objects (Vehicle-to-Everything), etc.). In this case, the user terminals 20 may perform the functions of the base stations 10 described above. The words "upstream" and "downstream" may be interpreted as corresponding to terminal-to-terminal communications (eg, as "referring to direct communications"). For example, uplink, downlink, etc. can be interpreted as a direct channel.

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

The actions described herein as being performed by a base station may, in some cases, be performed by older nodes. Obviously, in a network containing one or more network nodes with base stations, various operations performed to communicate with terminals can be performed by base stations, one or more network nodes other than base stations (for example, mobility management nodes (eng. Mobility Management Entity, MME), serving gateways (English Serving-Gateway, S-GW), etc., but this list is not limiting) or combinations of the listed nodes.

The aspects/implementations illustrated in this disclosure may be used singly or in combination, which may vary depending on the preferred implementation. The order of operations, sequences, block diagrams, etc. used in this disclosure to describe aspects/implementations may be changed if this does not lead to inconsistencies. For example, while the various methods are illustrated in the present disclosure with various components of the steps in the order provided by way of example, the specific order presented here is in no way limiting.

Aspects/implementations illustrated in this disclosure may apply to LTE, LTE-A, LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, fourth and fifth generation (4G, 5G) mobile communications systems, FRA, New RAT, New Radio System (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile communications, GSM (registered trademark)), CDMA2000, for Ultra Mobile Broadband (UMB), for IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (Wi- MAX (registered trademark)), IEEE 802.20, for short distance communication system using Ultra-Wide Band (UWB) signals, for Bluetooth system (registered trademark), for systems using other suitable methods of radio communication, and for systems of the next generations, improved on the basis of these systems, etc. Multiple systems can be combined and used (eg combination of LTE or LTE-A and 5G, etc.).

In this disclosure, the phrase "based on" (or "based on") does not mean "only based on" (or "only based on"), unless otherwise indicated. In other words, the phrase "on the basis of" (or "on the basis of") means both "on the basis of" and "on the basis of at least" ("only on the basis of" and "at least on the basis of").

Referencing elements using designations such as "first", "second", etc. the present disclosure does not generally limit the number or order of these elements. These designations may be used in the present disclosure for convenience only, as a way to distinguish between two or more elements. Thus, the mention of the first and second elements does not imply that only two elements can be used, or that the first element must in any way precede the second element.

The term "decision" ("determination") in the present disclosure can cover a wide variety of actions. For example, “decision” (“determining”) can be interpreted as making decisions (carrying out checks) related to judgment, calculation, calculation, processing, inference, research, search, search and query (for example, search in a table, database or some other data structure), establishing a fact, etc.

Further, the term “decision” (“determining”) can be interpreted as meaning making decisions (carrying out checks) related to receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, access (for example, access to data in memory), etc.

In addition, the term "decision" ("determining") in this document can be interpreted as meaning making decisions (carrying out checks) related to disambiguation, selection, selection, establishment, comparison, etc. In other words, “decision” (“determination”) can be interpreted as making decisions about the implementation (determining the need) for some action.

In addition, “decision” (“determination”) can be interpreted as “guess”, “expectation”, “consideration”, etc.

In this disclosure, the terms "connected", "connected" and any of their options means all direct or indirect connections or connections between two or more elements, and may allow the presence of one or more intermediate elements between two elements that are "connected" or "connected" between themselves. The relationship or connection between these elements may be physical, logical, or a combination of both. For example, "connection" can be interpreted as "access".

When the present disclosure indicates that two elements are connected, the two elements may be considered to be connected or interconnected using one or more electrical conductors, cables, and printed electrical connections, and, as a few non-limiting and non-exclusive examples, using electromagnetic energy, having wavelengths in radio frequency bands, microwave bands and optical (both visible and invisible) bands, or the like.

In the present disclosure, the expression "A and B are different" may mean "A and B are different from each other." It should be noted that this expression can mean "both A and B are different from C". The terms "separate", "be connected", etc. can be interpreted similarly to the term "various".

When used in the present disclosure, for example, terms such as "include", "comprising" and variations thereof, these terms should be understood in a content sense similar to that in which the term "comprising" is used. The conjunction "or" in this disclosure is not to be understood as meaning an exclusive disjunction.

In the present disclosure, when an article such as "a", "an" and "the" is added in English translation, the noun after the said article can be interpreted as containing the plural value as well.

Now, while the present invention has been described in detail above, it should be apparent to those skilled in the art that the invention according to the present disclosure is in no way limited to the implementations described in this disclosure. The invention according to the present disclosure can be carried out with various changes and in various modifications without deviating from the spirit and scope of the present invention as defined by the claims. Accordingly, the description of the present disclosure is provided for illustrative purposes only and should in no way be construed as limiting the present invention in any way.

Claims (12)

1. Terminal containing: a receiving section configured to receive one piece of downlink control information (DCI) used for scheduling a physical downlink common channel (PDSCH); And a control section configured to determine, based on a plurality of search spaces or a plurality of control resources (CORESET), the number of quasi-colocation guesses (QCL) applied to the physical downlink common channel (PDSCH) when the time offset between the reception of downlink control information (DCI) and physical downlink common channel (PDSCH) reception is less than a threshold value. 2. A radio communication method for a terminal, comprising the steps of: receiving one piece of downlink control information (DCI) used for scheduling a physical downlink common channel (PDSCH); And determine, based on a set of search spaces or a set of control resources (CORESET), the number of quasi-colocation (QCL) assumptions applied to the physical downlink common channel (PDSCH) when the time offset between the reception of the downlink control information (DCI) and the reception of the physical downlink common channel ( PDSCH) is less than the threshold value. 3. A radio communication system comprising a terminal and a base station, in which: terminal contains: a receiving section configured to receive one piece of downlink control information (DCI) used for scheduling a physical downlink shared channel (PDSCH); And a control section configured to determine, based on a plurality of search spaces or a plurality of control resources (CORESET), the number of quasi-colocation guesses (QCL) applied to the physical downlink common channel (PDSCH) when the time offset between the reception of downlink control information (DCI) and physical downlink common channel (PDSCH) reception is less than a threshold, and base station contains: a transmission section configured to transmit downlink control information (DCI).

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