阅读说明：本技术 用户终端以及无线通信方法 (User terminal and wireless communication method ) 是由 松村祐辉 永田聪 于 2019-01-18 设计创作，主要内容包括：本公开的一方式所涉及的用户终端具有：控制单元,设想为特定上行发送的空间关系与特定下行信道的发送控制指示状态(TCI)状态或者准共址设想(QCL)设想相同；以及发送单元,使用上述空间关系来进行所述特定上行发送。根据本公开的一方式,能够适当地进行对UL波束的控制。(A user terminal according to an aspect of the present disclosure includes: a control unit configured to assume that a spatial relationship of a specific uplink transmission is the same as a transmission control indication state (TCI) state or a quasi-co-location assumption (QCL) assumption of a specific downlink channel; and a transmitting unit configured to perform the specific uplink transmission using the spatial relationship. According to an aspect of the present disclosure, control of UL beams can be appropriately performed.)

1. A user terminal, comprising:

a control unit, which assumes that the spatial relationship of specific uplink transmission is the same as the transmission control indication state of a specific downlink channel, i.e. the TCI state, or the QCL assumption, i.e. the quasi-co-location assumption; and

a transmitting unit configured to perform the specific uplink transmission using the spatial relationship.

2. The user terminal of claim 1,

when spatial relationship information is not set by SRS setting information that is sounding reference signal setting information, the control unit assumes that the spatial relationship is the same as the TCI state or the QCL assumption.

3. The user terminal of claim 2,

when there is no field indicating the spatial relationship in an RRC information element that is a radio resource control information element used for setting of the specific uplink transmission, the control unit may be configured to: the spatial relationship is the same as an activated TCI state of the particular downlink channel, or an activated TCI state of a control resource set, or a QCL assumption, the control resource set having a lowest control resource set ID in a latest time slot and being associated with a monitored search space.

4. The user terminal of claim 2,

when a higher layer parameter indicating spatial relationship information for a specific type of SRS resource is not set, the control unit assumes that: the spatial relationship is the same as an activated TCI state of the particular downlink channel, or an activated TCI state of a control resource set, or a QCL assumption, the control resource set having a lowest control resource set ID in a latest time slot and being associated with a monitored search space.

5. The user terminal of claim 1,

in a case where spatial relationship information is not set by SRS setting information that is sounding reference signal setting information in a frequency higher than 6GHz, the control unit assumes that the spatial relationship is the same as the TCI state or the QCL assumption.

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

assuming that a spatial relationship for specific uplink transmission is the same as a transmission control indication state of a specific downlink channel, i.e., a TCI state, or a quasi-co-location assumption, i.e., a QCL assumption; and

and performing the specific uplink transmission using the spatial relationship.

Technical Field

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

Background

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

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

In an existing LTE system (e.g., LTE rel.8-14), a User terminal (User Equipment (UE)) controls transmission of an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)) based on Downlink Control Information (DCI)).

Documents of the prior art

Non-patent document

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

Disclosure of Invention

Problems to be solved by the invention

In future wireless communication systems (e.g., NR), it is considered to specify one of a plurality of candidates set by higher layer signaling, for example, by a Medium Access Control (MAC) Control Element (CE) or Downlink Control Information (DCI) with respect to a beam (spatial relationship) for Uplink (UL) transmission of a PUCCH, PUSCH, SRS, or the like.

However, the number of settable candidates is limited. In order to use a large number of candidates, there is a possibility that delay, resource consumption, or the like occurs when a reset is performed by higher layer signaling.

Accordingly, an object of the present disclosure is to provide a user terminal and a wireless communication method that appropriately perform control of an UL beam.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a control unit, which assumes that the spatial relationship of specific uplink transmission is the same as the transmission control indication state of a specific downlink channel, i.e. the TCI state, or the QCL assumption, i.e. the quasi-co-location assumption; and a transmission unit configured to perform the specific uplink transmission using the spatial relationship.

Effects of the invention

According to an aspect of the present disclosure, control of UL beams can be appropriately performed.

Drawings

Fig. 1 is a diagram illustrating an example of beam correspondence.

Fig. 2 is a diagram showing an example of spatial relationship of specific UL transmission.

Fig. 3 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 4 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 5 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 6 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(TCI, spatial relationship, QCL)

In NR, it is considered to control reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and Transmission processing (for example, at least one of Transmission, mapping, precoding, modulation, and coding) in a UE of at least one of a signal and a channel (expressed as a signal/channel) based on a Transmission Configuration Indication state (TCI state).

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

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

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

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

The QCL may also be specified in multiple types (QCL types). For example, 4 QCL types a-D may be set, and in these 4 QCL types a-D, it can be assumed that the same parameter (or parameter set) is different, and this parameter is represented as follows:

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

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

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

QCL type D: the space receives the parameters.

The UE is assumed to be: a particular Set of Control resources (CORESET), channel, or reference signal may also be referred to as a QCL assumption (QCL assumption) in a particular QCL (e.g., QCL type D) relationship with another CORESET, channel, or reference signal.

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

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

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

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

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

The Channel for setting (specifying) the TCI state may be at least one of a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))), an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), and an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))).

The RS that has a QCL relationship with the Channel may be at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), and a measurement Reference Signal (SRS), for example.

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

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

< TCI State for PDCCH >

Information on the QCL of the PDCCH (or a DeModulation Reference Signal (DMRS)) and a specific DL-RS associated with the PDCCH may also be referred to as a TCI state used for the PDCCH, or the like.

The UE may also determine the TCI status for the UE-specific pdcch (coreset) based on higher layer signaling. For example, for the UE, one or more (K) TCI states may be set for each CORESET through RRC signaling.

For each CORESET, the UE may also activate one of a plurality of TCI states set by RRC signaling through the MAC CE. The MAC CE may also be referred to as a TCI status Indication MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH. The UE may also perform monitoring of the CORESET based on the activated TCI state corresponding to the CORESET.

< TCI State for PDSCH >

The information on the PDSCH (or DMRS antenna port associated with the PDSCH) and the QCL of the specific DL-RS may also be referred to as a TCI state for the PDSCH, etc.

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

The DCI used for scheduling the PDSCH may include a field (may be referred to as, for example, a TCI field, a TCI status field, or the like) indicating the TCI status specification for the PDSCH. This DCI may be used for scheduling of PDSCH of one cell, and may be referred to as DL DCI, DL assignment, DCI format 1_0, DCI format 1_1, or the like.

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

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

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

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

In addition, the above-mentioned specific Threshold may also be referred to as "Threshold", "Threshold for indicating a deviation between DCI in the TCI state and DCI scheduled PDSCH (Threshold for Offset between DCI indicating a TCI state and a PDSCH scheduled by the DCI)", "Threshold-scheduled-Offset", scheduling (scheduling) deviation Threshold, and the like.

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

Further, when the scheduling deviation is smaller than the scheduling deviation threshold, the UE may also assume that: the DMRS port for the RS in TCI state and the PDSCH of the serving cell in QCL with QCL parameters indicating the QCL of the PDCCH corresponding to the smallest CORESET-ID in the latest (most recent) slot in which more than one CORESET is set to the UE within the active BWP of the serving cell (the DM-RS ports of PDSCH of a serving cell area with-located with the RS(s) in the TCI state with the least time of the QCL parameter(s) used for PDCCH area with-location indication of the location of the UE in the slot of the mobile node.

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

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

< spatial relationship for PUCCH >

For the UE, parameters (PUCCH configuration information, PUCCH-configuration) for PUCCH transmission may be set by higher layer signaling (e.g., Radio Resource Control (RRC)) signaling). The PUCCH setting information may be set for each fractional band (e.g., uplink bandwidth part (bwp)) in a carrier (also referred to as a cell, component carrier, or the like).

The PUCCH setting information may include a list of PUCCH resource set information (e.g., PUCCH-ResourceSet) and a list of PUCCH spatial relationship information (e.g., PUCCH-SpatialRelationInfo).

The PUCCH resource set information may also contain a list (e.g., resourceList) of PUCCH resource indices (IDs, e.g., PUCCH-resourcelds).

In addition, when the UE does not include dedicated PUCCH resource setting Information (e.g., dedicated PUCCH resource configuration) provided by PUCCH resource set Information in the PUCCH setting Information (before RRC establishment), the UE may determine the PUCCH resource set based on a parameter (e.g., PUCCH-resource common) in System Information (e.g., System Information Block Type1(SIB1)) or Remaining Minimum System Information (RMSI)). The PUCCH resource set may also contain 16 PUCCH resources.

On the other hand, when the UE includes the dedicated PUCCH resource setting information (UE-dedicated uplink control channel structure, dedicated PUCCH resource structure) (after RRC establishment), the UE may determine a PUCCH resource set based on the number of UCI information bits.

The UE may also determine the value of a specific field (e.g., PUCCH REsource indicator (PUCCH) field) in Downlink Control Information (DCI)) (e.g., DCI format 1_0 or 1_1 for scheduling PDSCH), and the number of CCEs (N) in a PDCCH reception Control REsource SET (core) for advancing the DCI_CCE) And an index (n) of the first (first) CCE received by the PDCCH_CCE、0) Determines one PUCCH resource (index) in the PUCCH resource set (e.g., a PUCCH resource set determined by a cell or a UE individually).

PUCCH spatial relationship information (e.g., "PUCCH-spatial relationinfo" of RRC information element) may also represent a plurality of candidate beams (spatial domain filters) for PUCCH transmission. The PUCCH spatial relationship information may also indicate a spatial relationship between an RS (Reference signal) and the PUCCH.

The list of PUCCH spatial relationship Information may also contain some elements (PUCCH spatial relationship Information IE (Information Element)). Each PUCCH spatial relationship information may include at least one of information on an index (ID, for example, PUCCH-spatial relationinfoid) of the PUCCH spatial relationship information, an index (ID, for example, servicecellid) of the serving cell, and an RS (reference RS) having a spatial relationship with the PUCCH.

For example, the information about the RS may also be an SSB index, a CSI-RS index (e.g., NZP (Non-Zero Power)) -CSI-RS resource structure ID), or an SRS resource ID and an ID of BWP. The SSB index, CSI-RS index, and SRS resource ID may also be associated with at least one of a beam, a resource, and a port selected by the measurement of the corresponding RS.

For the UE, one of more than one PUCCH spatial relationship information (for example, PUCCH-spatial relationship info or candidate beam) in the list of PUCCH spatial relationship information may also be indicated by a MAC (Medium Access Control) CE (Control Element). The MAC CE may also be a MAC CE that activates or deactivates PUCCH spatial relationship information (PUCCH spatial relationship information activation/deactivation MAC CE, PUCCH spatial relationship information indication MAC CE).

The UE may also activate PUCCH relationship information designated by a MAC CE activating specific PUCCH spatial relationship information 3ms after transmitting a positive response (ACK) for the MAC CE.

The UE may also control transmission of the PUCCH based on PUCCH spatial relationship information activated by the MAC CE. In addition, when the single PUCCH spatial relationship information is included in the list of PUCCH spatial relationship information, the UE may control transmission of the PUCCH based on the PUCCH spatial relationship information.

< spatial relationship for SRS, PUSCH >

The UE may receive information (SRS setting information, for example, a parameter in "SRS-Config" of the RRC control element) used for transmission of a measurement Reference Signal (for example, Sounding Reference Signal (SRS)).

Specifically, the UE may also receive at least one of information related to one or more SRS Resource sets (SRS Resource set information, e.g., "SRS-resources set" of an RRC control element) and information related to one or more SRS resources (SRS Resource information, e.g., "SRS-resources" of an RRC control element).

One SRS resource set may be associated with a specific number of SRS resources (the specific number of SRS resources may be grouped). Each SRS Resource may be specified by an SRS Resource Identifier (SRS Resource Indicator (SRI)) or an SRS Resource ID (Identifier).

The SRS resource set information may include: SRS resource set ID (SRS-ResourceSetId), a list of SRS resource IDs (SRS-resourceids) used in the resource set, SRS resource types (e.g., any of periodic SRS (periodic SRS), Semi-Persistent SRS (Semi-Persistent SRS), aperiodic csi (aperiodic SRS)), and usage (usage) of SRS.

Here, the SRS resource type may also mean any of Periodic SRS (Periodic SRS: P-SRS), Semi-Persistent SRS (SP-SRS), and Aperiodic CSI (Aperiodic SRS: A-SRS). The UE may periodically (or after activation) transmit the P-SRS and the SP-SRS, and may transmit the a-SRS based on the SRS request of the DCI.

Further, the usage ("use" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1)) parameter) may be, for example, beam management (beamManagement), codebook (codebook: CB), non-codebook (noncodebook: NCB), antenna switching (switching), or the like. Codebook or non-codebook used SRS may also be used for decision of precoders for PUSCH transmission based on the codebook or non-codebook banks of the SRI.

For example, when transmitting in the codebook bank, the UE may determine a precoder to be used for PUSCH transmission based on the SRI, the transmission Rank Indicator (Transmitted Rank Indicator: TRI), and the transmission Precoding Matrix Indicator (Transmitted Precoding Matrix Indicator: TPMI). In the case of non-codebook bank transmission, the UE may also determine a precoder for PUSCH transmission based on the SRI.

The SRS resource information may include an SRS resource ID (SRS-resource ID), an SRS port number, a transmission Comb, SRS resource mapping (for example, a time and/or frequency resource position, a resource offset, a resource period, an inverse number, an SRS symbol number, an SRS bandwidth, and the like), hopping association information, an SRS resource type, a sequence ID, spatial relationship information of the SRS, and the like.

The spatial relationship information of the SRS (e.g., "spatial relationship info" of the RRC information element) may also indicate spatial relationship information between a specific reference signal and the SRS. The specific Reference Signal may also be at least one of a Synchronization Signal/Broadcast Channel (SS/PBCH) block, a Channel State Information Reference Signal (CSI-RS), and an SRS (e.g., other SRS). The SS/PBCH block may also be referred to as a Synchronization Signal Block (SSB).

The SRS spatial relationship information may include at least one of an SSB index, a CSI-RS resource ID, and an SRS resource ID as an index of the specific reference signal.

In addition, in the present disclosure, the SSB index, the SSB Resource ID, and the SSBRI (SSB Resource Indicator) may also be replaced with each other. In addition, a CSI-RS index, a CSI-RS Resource ID, and a CRI (CSI-RS Resource Indicator) may also be substituted for each other. In addition, the SRS index, SRS resource ID, and SRI may be replaced with each other.

The SRS spatial relationship information may include a serving cell index (scell), a BWP index (BWP ID), and the like corresponding to the specific reference signal.

In NR, transmission of an uplink signal may be controlled based on the presence or absence of Beam Coherence (BC). BC may be, for example, the capability of a node (e.g., a base station or a UE) to determine a beam (transmission beam, Tx beam) used for transmission of a signal based on a beam (reception beam, Rx beam) used for reception of the signal.

Further, BC may also be referred to as transmission/reception beam correspondence (Tx/Rx beam correlation), beam reciprocity (beam reception), beam correction (beam calibration), corrected/Non-corrected (Calibrated/Non-corrected), reciprocity corrected/Non-corrected (corrected/Non-corrected), degree of correspondence, degree of coincidence, and the like.

As shown in fig. 1, at BC, when the gNB performs transmission beam scanning using beams B21 to B24 and the UE performs reception beam scanning using beams B1 to B4, the gNB and the UE determine beam B22 of the gNB as a DL transmission beam and beam B2 of the UE as a DL reception beam based on the measurement results. The gNB also uses the determined beam B22 as the UL receive beam, and the UE also uses the determined beam B2 as the UL transmit beam.

For example, when there is no BC, the UE may transmit an uplink signal (e.g., PUSCH, PUCCH, SRS, etc.) using the same beam (spatial domain transmission filter) as the SRS (or SRS resource) instructed from the base station based on the measurement result of one or more SRSs (or SRS resources).

On the other hand, when BC is present, the UE may transmit an uplink signal (e.g., PUSCH, PUCCH, SRS, etc.) using the same or a corresponding beam (spatial domain transmission filter) as a beam (spatial domain reception filter) used for reception of a specific SSB or CSI-RS (or CSI-RS resource).

When spatial relationship information on an SSB or CSI-RS and an SRS is set for a certain SRS resource (for example, when BC is present), the UE may transmit the SRS resource using the same spatial filter (spatial domain transmission filter) as a spatial domain filter (spatial domain reception filter) used for reception of the SSB or CSI-RS. In this case, the UE may assume that the UE reception beam of the SSB or CSI-RS is the same as the UE transmission beam of the SRS.

When spatial relationship information on another SRS (reference SRS) and the SRS (target SRS) is set for a certain SRS (target SRS) resource (for example, when BC is not present), the UE may transmit the target SRS resource using the same spatial filter (spatial transmission filter) as a spatial filter (spatial transmission filter) used for transmission of the reference SRS. That is, in this case, the UE may assume that the UE transmission beam of the reference SRS is the same as the UE transmission beam of the target SRS.

The UE may determine the spatial relationship of the PUSCH scheduled by the DCI (e.g., DCI format 0_1) based on the value of a specific field (e.g., SRS Resource Identifier (SRI) field) in the DCI. Specifically, the UE may also use spatial relationship information of the SRS resource (e.g., "spatial relationship info" of the RRC information element), which is decided based on the value (e.g., SRI) of the specific field, for PUSCH transmission.

(problem point)

As described above, for the PDCCH or PDSCH, a plurality of TCI states may be set by RRC for the UE, and one of the plurality of TCI states may be indicated by the MAC CE or DCI. Therefore, it is possible to switch the beam quickly without performing RRC reconfiguration (reconfiguration).

The maximum number of TCI States (maxNrofTCI-States) that can be set by RRC is 128, and the maximum number of TCI States (maxNrofTCI-States PDCCH) for PDCCH is 64.

For PUCCH, 8 spatial relationships may be set for one PUCCH resource by RRC for the UE, and one spatial relationship may be indicated by the MAC CE. In order to use spatial relationships other than the 8 spatial relationships set by the RRC, RRC reconfiguration is required.

When the UE transmits using the codebook bank for the PUSCH, 2 SRS resources may be set by RRC for the UE, and one of the 2 SRS resources may be indicated by DCI (1-bit field). When waiting for PUSCH transmission using a non-codebook pool, the UE may set 4 SRS resources by RRC and indicate 1 of the 4 SRS resources by DCI (2-bit field). In order to use a spatial relationship other than the 2 or 4 spatial relationships set by the RRC, RRC reconfiguration is required.

DL-RS can be set for the spatial relationship of SRS resources used for PUSCH. For SP-SRS, the spatial relationship of a plurality of (e.g., at most 16) SRS resources can be set by RRC for the UE, and one of the plurality of SRS resources is indicated by MAC CE. For A-SRS and P-SRS, the spatial relationship of SRS resources cannot be indicated by the MAC CE for the UE.

As described above, there is a possibility that a large number of candidates for the spatial relationship need to be set at once as the spatial relationship for UL transmission (PUCCH, PUSCH, or SRS). For example, by beam correspondence, when DL-RS (TCI state of DL) is used as the spatial relationship of UL transmission, there is a possibility that a large number of DL-RSs (for example, 32 SSBs) are set.

However, as described above, the number of candidates having a spatial relationship that can be set at once for UL transmission is limited and is smaller than the number of candidates having a TCI state that can be set at once for DL channels. In order to use a spatial relationship that is not set for UL transmission, it is considered to set another spatial relationship by RRC reconfiguration. When RRC reset is performed, communication is disabled for a long time, resources are consumed, and the performance of the system may deteriorate.

Thus, the inventors of the present invention think that: the UE assumes that the spatial relationship for a particular uplink transmission is the same as the Transmission Control Indication (TCI) state or quasi co-location (QCL) of a particular downlink channel.

In the present disclosure, the specific UL transmission may be replaced with a specific UL signal or a specific UL channel, and may also be replaced with at least one of PUSCH, PUCCH, SRS. The specific DL channel may also be replaced with at least one of a PDCCH and a PDSCH. The spatial relationship may also be replaced with a spatial domain transmit filter, a spatial domain filter, a UE transmit beam, a UL transmit beam, a DL-RS, etc. The TCI state may also be replaced with a TCI state or QCL hypothesis, spatial domain receive filter, spatial domain filter, UE receive beam, DL-RS, etc.

The TCI status may also represent the receive beam (spatial domain receive filter) indicated (set) for the UE. QCL concept may also represent the receive beams (spatial domain receive filters) envisaged by the UE based on the transmission or reception of the signal being associated (e.g. PRACH).

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

(Wireless communication method)

< embodiment 1>

The UE may also assume (or may be considered to assume) that the spatial relationship of a particular UL transmission is the same as the TCI state or QCL of a particular DL channel.

As shown in fig. 2, the UE may also use the TCI state of a particular DL channel (e.g., DL-RS, spatial domain receive filter, spatial domain filter, UE receive beam) as the spatial relationship of a particular UL transmission (e.g., DL-RS, spatial domain transmit filter, spatial domain filter, UE transmit beam).

When the spatial relationship (e.g., spatial relationship info) of the SRS configuration information (SRS-config) is not set, the UE may assume that the spatial relationship of the specific UL transmission is the same as the TCI state of the specific DL channel.

In Frequency Range 1(Frequency Range 1: FR1, frequencies of 6GHz or less), the UE may not use analog beamforming for UL transmission or may not set a spatial relationship for UL transmission.

In Frequency Range 2(Frequency Range 2: higher frequencies than FR2, 6GHz (or higher frequencies than 24 GHz)), the UE may also assume that the spatial relationship of a particular UL transmission is the same as the TCI state of a particular DL channel. In FR2, when the spatial relationship of SRS setting information is not set, the UE may assume that the spatial relationship for specific UL transmission is the same as the TCI state of a specific DL channel.

In case the TCI status of a specific DL channel can be applied, the UE can also assume that the spatial relationship for a specific UL transmission is the same as the TCI status of a specific DL channel. When the TCI status of the specific DL channel is applicable and the spatial relationship of the SRS configuration information is not set, the UE may assume that the spatial relationship of the specific UL transmission is the same as the TCI status of the specific DL channel.

In FR2, when the TCI status of a specific DL channel can be applied, the UE can also assume that the spatial relationship for specific UL transmission is the same as the TCI status of the specific DL channel. In FR2, when the TCI status of the specific DL channel is applicable and the spatial relationship of the SRS configuration information is not set, the UE may assume that the spatial relationship for the specific UL transmission is the same as the TCI status of the specific DL channel.

When setting the specific function after rel.16, the UE may assume that the spatial relationship for specific UL transmission is the same as the TCI state of the specific DL channel. When the specified function is set and the spatial relationship of the SRS setting information is not set, the UE may assume that the spatial relationship for the specific UL transmission is the same as the TCI state of the specific DL channel.

The specific function may be a function of beam association after rel.16. The specific functions may also be set to the UE through higher layer signaling. The function of beam association may also be at least one of low delay beam selection (low latency beam selection), Layer 1(Layer 1) (L1) -Signal to Interference plus Noise Ratio (SINR)) beam reporting (L1-SINR beam reporting), BFR on secondary cell (SCell) (BFR on SCell). The low delay beam selection may also be referred to as fast beam selection (fast beam selection), beam selection without TCI state (beam selection w/o TCI state), beam selection type ii (beam selection type ii), TCI state designation type 2, and the like. The L1-SINR beam report may be the case where the UE reports the L1-SINR measurement results (CSI, L1-SINR corresponding to the beam) for beam management. The BFR on the SCell may be at least one of a case of detecting a Beam Failure (BF) in the SCell, a case of transmitting a Beam Failure Recovery reQuest (BFRQ) to the SCell, and a case of receiving a Beam Failure Recovery (BFR) response from the SCell.

The specific configuration information (RRC information element) may also indicate a specific parameter indicating that the spatial relationship of the specific UL transmission is the same as the TCI state of the specific DL channel. In the case where the specific parameter is set by the specific setting information (the case where the specific setting information indicates the specific parameter, or the case where the specific setting information includes a field of the specific parameter), the UE may assume that the spatial relationship for the specific UL transmission is the same as the TCI state of the specific DL channel. The specific parameter may be a parameter (for example, TCI state) indicating that the spatial relationship of the specific UL transmission is the same as the TCI state of the specific DL channel, a parameter (for example, CORESET) indicating that the spatial relationship of the specific UL transmission is the same as the TCI state of the CORESET, or a parameter (for example, ControlRS) indicating that the spatial relationship of the specific UL transmission is the same as the Reference Signal (RS) used as the TCI state of the specific DL channel.

The specific setting information may be spatial relationship information (for example, spatial relationship info, PUCCH-spatial relationship info), reference signal information (referral signal) in the spatial relationship information, or a type in the spatial relationship information. For example, one of the options of the reference signal information or type may also be a specific parameter.

The specific setting information may be spatial relationship information (spatialrelalationinfo) in SRS Resource information (SRS-Resource). When the specific parameter is set by the specific setting information, the UE may assume that the spatial relationship of the SRS and the TCI state of the specific DL channel are the same.

When SRS Resource set information (SRS-Resource set) in SRS setting information (SRS-Config) indicates that the SRS Resource set information is used for codebook or non-codebook transmission (indicating that the use (use) in the SRS Resource set information is codebook (codebook) or non-codebook (non-codebook)), and a specific parameter is set by spatial relationship information (spatialrelalationinfo) in the SRS Resource information (SRS-Resource) indicating SRS resources in the SRS Resource set, the UE may assume that the spatial relationship of the PUSCH is the same as the TCI state of the specific DL channel.

The specific setting information may be PUCCH spatial relationship information (PUCCH-spatial relationship info) in PUCCH setting information (PUCCH-Config). When the specific parameter is set by the PUCCH spatial relationship information, the UE may assume that the spatial relationship of the PUCCH is the same as the TCI state of the specific DL channel.

The TCI state of a particular DL channel may also be replaced with an active TCI state (activated TCI state), an active TCI state, or QCL assumptions, among others.

Multiple TCI states may also be active for a particular DL channel. The TCI state of a particular DL channel may also be replaced with the TCI state or QCL hypothesis of the CORESET having the lowest CORESET-ID in the most recent time slot and associated with the monitored search space, or may be replaced with the TCI state or QCL hypothesis (e.g., default TCI state) of the DL channel corresponding to the UL transmission (triggering UL transmission, scheduling UL transmission).

For example, when the specific UL transmission is a PUCCH, the specific DL channel may be a PDCCH corresponding to the PUCCH or a PDSCH corresponding to HARQ-ACK advanced on the PUCCH. In case that the specific UL transmission is an A-SRS, the specific DL channel may also be a PDCCH that triggers the A-SRS. When the specific UL transmission is an UL transmission triggered by a MAC CE, such as SP-SRS, the specific DL channel may be a PDCCH for scheduling the MAC CE or a PDSCH for promoting the MAC CE.

The specific UL transmission may also be at least one of a PUSCH and an SRS. This can reduce the change of the specification. The number of spatial relationships set by the PUCCH setting information may be increased for the PUCCH (for example, embodiment 2 described later).

As a case where the spatial relationship of the SRS configuration information is not set to the UE, at least one of embodiments 1-1 to 1-3 below may be used.

< embodiment mode 1-1>

The UE may also assume that the spatial relationship of SRS is the same as the TCI state of a particular DL channel without a specific field within specific higher layer parameters (e.g., RRC information elements).

When there is no specific field in the SRS Resource information (SRS-Resource) in the SRS configuration information (SRS-Config), the UE may assume that the spatial relationship of the SRS is the same as the activated TCI state of the specific DL channel. The specific field may be spatial relationship information (spatial relationship info) that is a setting of a spatial relationship between a reference RS (reference RS, for example, SSB, CSI-RS, or SRS) and a target SRS.

When SRS Resource set information (SRS-Resource set) in SRS setting information (SRS-Config) indicates codebook or non-codebook transmission (indicating that the usage (use) in the SRS Resource set information is codebook or non-codebook), and there is no specific field in SRS Resource information (SRS-Resource) indicating SRS resources in the SRS Resource set, the UE may assume that the spatial relationship of the PUSCH is the same as the activated TCI state of the specific DL channel. The specific field may also be spatial relationship information (spatialRelationInfo).

When there is no specific field in the PUCCH configuration information (PUCCH-Config), the UE may assume that the spatial relationship of the PUCCH is the same as the activated TCI state of the specific DL channel. The specific field may also be an element (element) of a list (spatialrelalationinfotoaddmodlist). The element may be PUCCH spatial relationship information (PUCCH-spatial relationship info) used to set spatial setting for PUCCH transmission.

< embodiments 1 to 2>, a process for producing a semiconductor device, and a semiconductor device

When the specific higher layer parameter is not set, the UE may assume that the spatial relationship of the SRS and the TCI state of the specific DL channel are the same.

The specific higher layer parameter may be a specific RRC information element or a higher layer parameter (spatial relationship info) of spatial relationship information.

The SRS parameter (spatial relationship info) which is the set spatial relationship information of the spatial relationship between the reference RS and the target SRS may be set semi-statically (semi-statically) by the SRS Resource upper layer parameter (SRS-Resource).

When the higher layer parameter spatialRelationInfo is set, the ID of the reference RS may be included. The reference RS may also be an SS/PBCH block, a CSI-RS, or an SRS. In the presence of a higher layer parameter (servicecellid) for the serving cell ID, the CSI-RS may also be set on the serving cell indicated by the higher layer parameter. The SRS may be set on the UL BWP indicated by the upper layer parameter (uplinkBWP) of the UL BWP, on the serving cell indicated by the upper layer parameter (servingCellId) when the upper layer parameter (servingCellId) of the serving cell ID exists, or on the same serving cell as the target SRS.

In the case where the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the activated TCI state of the specific DL channel.

When the higher layer parameter spatialRelationInfo is not set, the UE may assume that: the spatial relationship is assumed to be the same as the active TCI state for a particular DL channel, or the TCI state or QCL for the CORESET that has the lowest CORESET-ID in the most recent time slot and is associated with the search space being monitored.

< embodiments 1 to 3>

In case that specific higher layer parameters for a specific type are not set, the UE may also assume that the spatial relationship of SRS is the same as the TCI state of a specific DL channel. The specific type may be at least one of a P-SPS, a SP-SRS, and an A-SRS, or may be specified by a higher layer parameter (resourceType) of a resource type within the SRS resource information.

<<<P-SRS>>>

The case where the SRS Resource information (SRS-Resource) indicates P-SRS for a UE in which one or more SRS Resource settings are set (the case where a higher layer parameter (Resource type) indicating a Resource type in the SRS Resource information is "periodic") is described.

When higher layer parameter spatialrelalationinfo including ID (ssb-Index) of the reference SS/PBCH block is set for the UE, the UE may also transmit the target SRS resource having the same spatial domain transmission filter as that used for reception of the reference SS/PBCH block. When the UE is set with the spatial relationship info, which is a higher layer parameter including the ID (CSI-RS-Index) of the reference CSI-RS, the UE may transmit the target SRS resource having the same spatial-domain transmit filter as the spatial-domain transmit filter used for reception of the reference periodic CSI-RS or the reference semi-persistent CSI-RS. When the UE is set with the spatial relationship info of the higher layer parameters including the id (SRS) of the reference SRS, the UE may transmit the target SRS resource having the same spatial domain transmission filter as the spatial domain transmission filter used for transmission of the reference P-SRS.

In the case where the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the activated TCI state of the specific DL channel.

In the case where the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the TCI state or QCL of the CORESET having the lowest CORESET-ID in the latest slot and associated with the monitored search space.

<<<SP-SRS>>>

The following is described: for a UE for which one or more SRS Resource settings are set, SRS Resource information (SRS-Resource) indicates a case of SP-SRS (a higher layer parameter (Resource type) indicating a Resource type in the SRS Resource information is "semi-persistent".

When the UE receives an activation command for SRS resources and when HARQ-ACK corresponding to PDSCH of a push selection command (selection command) is transmitted in slot N, the corresponding operation and assumption of the UE on SRS transmission corresponding to the set SRS resources may be applied from slot N +3N +1 (N is the number of slots in the subframe). The activation command may also contain a spatial relationship assumption provided by a list of references to reference signal IDs of one of each element of the activated SRS resource set. Each ID in the list may also refer to a reference SS/PBCH block, a reference NZP CSI-RS resource, or an SRS resource. The reference NZP CSI-RS resource may be a NZP CSI-RS resource set in a serving cell indicated by the resource when the resource serving cell ID field exists in the activation command, or may be a NZP CSI-RS resource set in the same serving cell as the SRS resource set when the resource serving cell ID field does not exist in the activation command. The reference SRS resource may be an SRS resource set on the serving cell indicated by the resource and on the UL BWP when the resource serving cell ID and the resource BWP ID exist in the activation command, or may be an SRS resource set on the serving cell same as the SRS resource set and on the BWP when the resource serving cell ID and the resource BWP ID do not exist in the activation command.

When the UE is set with the higher layer parameter spatialrelalationinfo including the ID (ssb-Index) of the reference SS/PBCH block, the UE may also transmit the target SRS resource having the same spatial domain transmission filter as the spatial domain transmission filter used for reception of the reference SS/PBCH block. When the UE is set with the spatial relationship info, which is a higher layer parameter including the ID (CSI-RS-Index) of the reference CSI-RS, the UE may transmit the target SRS resource having the same spatial-domain transmit filter as the spatial-domain transmit filter used for reception of the reference periodic CSI-RS or the reference semi-persistent CSI-RS. When the UE is set with the spatial relationship info of the higher layer parameter including the id (SRS) of the reference SRS, the UE may transmit the target SRS resource having the same spatial domain transmission filter as the spatial domain transmission filter used for transmission of the reference SP-SRS or the reference SP-SRS.

The UE may also assume that the spatial relationship is the same as the activated TCI state of the particular DL channel when a higher layer parameter spatialRelationInfo is not set, or when a higher layer parameter spatialRelationInfo is not activated.

In the case where a higher layer parameter spatialRelationInfo is not set, or in the case where a higher layer parameter spatialRelationInfo is not activated, the UE may also assume that the spatial relationship is the same as the TCI state or QCL of the CORESET which has the lowest CORESET-ID in the latest slot and is associated with the monitored search space.

<<<A-SRS>>>

The following is described: for a UE to which one or more SRS Resource settings are set, SRS Resource information (SRS-Resource) indicates a-SRS (when a higher layer parameter (Resource type) indicating a Resource type in the SRS Resource information is "aperiodic").

When the UE is set with the higher layer parameter spatialrelalationinfo including the ID (ssb-Index) of the reference SS/PBCH block, the UE may transmit the target SRS resource of the same spatial domain transmission filter as the spatial domain transmission filter used for reception of the reference SS/PBCH block. When the UE is set with the spatial relationship info, which is a higher-layer parameter including the ID (CSI-RS-Index) of the reference CSI-RS, the UE may transmit the target SRS resource of the spatial-domain transmit filter, which is the same as the spatial-domain transmit filter used for reception of the reference periodic CSI-RS, the reference semi-persistent SP-CSI-RS, or the latest reference aperiodic CSI-RS. When higher layer parameter spatialRelationInfo including the id (SRS) of the reference SRS is set for the UE, the UE may transmit the target SRS resource having the same spatial domain transmission filter as the spatial domain transmission filter used for transmission of the reference P-SRS, the reference SP-SRS, or the reference a-SRS.

In the case where the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the activated TCI state of the specific DL channel.

In the case where the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the TCI state or QCL of the CORESET having the lowest CORESET-ID in the latest slot and associated with the monitored search space.

When the higher layer parameter spatialRelationInfo is not set, the UE may assume that the spatial relationship is the same as the TCI state or QCL of the PDCCH triggering a-SPS.

According to embodiment 1 described above, when the active TCI state of the specific DL channel is updated by the MAC CE or the DCI, the spatial relationship of the specific UL transmission can be updated. Since the spatial relationship of the specific UL transmission can be controlled quickly without RRC reconfiguration, the communication characteristics of the specific UL transmission can be improved. In addition, the overhead of signaling for spatial relationships can avoid disruption of communications.

The maximum number of total number of active spatial relationships among the UE capability information, which are DL-RS specific to (aperiodic NZP CSI-RS), SRS without spatial relationship setting, and DCI triggered TCI state usable for aperiodic NZP CSI-RS, is at least one, for spatial domain transmission filters for SRS for PUCCH and PUSCH for each indicated CC and each BWP. It is also being studied to support an additional one for PUCCH in case that the maximum number of the active spatial relationships is 1. According to embodiment 1, the total number of active spatial relationships can be kept at 1, and the UE can operate according to the UE capability information.

< embodiment 2>

More than 2 PUCCH resources within 1 PUCCH resource set may represent the same resource. The PUCCH configuration information may include 2 or more PUCCH spatial relationship information lists (spatial relationship info toaddmodlist). More than 2 PUCCH resources may be associated with different PUCCH spatial relationship information lists.

The UE may also indicate (activate), by the MAC CE, one piece of spatial relationship information in the corresponding PUCCH spatial relationship information list for each of 2 or more PUCCH resources. Thus, the UE may also indicate different PUCCH spatial relationship information for 2 or more PUCCH resources.

The UE may determine 1 PUCCH REsource in the PUCCH REsource SET based on at least one of a value of a PUCCH REsource indicator (PUCCH REsource indicator) field in DCI, a CCE number (N CCE) in a COntrol REsource SET (countrol REsource SET (CORESET)) for PDCCH reception for advancing the DCI, and an index (N CCE, 0) of a first CCE received by the PDCCH.

For example, PUCCH resources #0 and #1 in 1 PUCCH resource set may represent the same resource. The PUCCH spatial relationship information list including PUCCH spatial relationship information #0, #1, #2, #3, #4, #5, #6, and #7 may be associated with PUCCH resource #0, and the PUCCH spatial relationship information list including PUCCH spatial relationship information #8, #9, #10, #11, #12, #13, #14, and #15 may be associated with PUCCH resource # 1.

The UE may indicate 1 piece of PUCCH spatial relationship information in the corresponding PUCCH spatial relationship information list for each of PUCCH resources #0 and #1 by the MAC CE, or may indicate PUCCH resources #0 and #1 by the PDCCH. Thus, the UE can be assigned the same PUCCH resource regardless of whether PUCCH resources #0 and #1 are assigned, and can be assigned 1 of 16 pieces of PUCCH spatial relationship information.

For example, 8 PUCCH resources within 1 PUCCH resource set may represent the same resource. Different PUCCH resources may also be associated with different PUCCH spatial relationship information lists. In this case, the UE can indicate 1 of the 8 × 8-64 PUCCH spatial relationship information through the MAC CE and the PDCCH.

According to embodiment 2, more than 8 pieces of PUCCH spatial relationship information can be switched quickly without RRC reconfiguration.

(Wireless communication System)

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

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

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

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

The wireless communication system 1 may support Dual connection between a plurality of base stations in the same RAT (for example, Dual connection between an MN and an SN (NR-NR Dual Connectivity (NN-DC)) which are NR base stations (gnbs)).

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

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) using a plurality of Component Carriers (CCs)) and Dual Connectivity (DC).

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

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

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI)), X2 structure, or the like) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a Backhaul, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) host, and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

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

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

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, at least one of downlink (dl) and uplink (ul)) may use: cyclic Prefix OFDM (CP-OFDM)), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA)), and the like.

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

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

In the radio communication system 1, as an Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, may be used.

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

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

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

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

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

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

In the present disclosure, a downlink, an uplink, and the like may be expressed without adding a "link". Note that the "Physical (Physical)" may not be added to the beginning of each channel.

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

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

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

(base station)

Fig. 4 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission/reception unit 120, a transmission/reception antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in one or more numbers.

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

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

The control unit 110 may also control generation, scheduling (e.g., resource allocation, mapping), and the like of signals. The control unit 110 may control transmission/reception, measurement, and the like using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

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

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

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

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

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

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

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

The transmission/reception section 120(RF section 122) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception section 120(RF section 122) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 130.

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

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

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

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

Further, transmission/reception section 120 may transmit a reference signal (e.g., SSB, CSI-RS, etc.). The transmission/reception unit 120 may also transmit information (MAC CE or DCI) indicating the TCI status for a specific DL channel.

(user terminal)

Fig. 5 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

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

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

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

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

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

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

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

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

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

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

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

The transmission/reception section 220(RF section 222) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception section 220(RF section 222) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 230.

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

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

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

Further, transmission/reception section 220 may receive a reference signal (e.g., SSB, CSI-RS, etc.).

Furthermore, control unit 210 may also assume that the spatial relationship of a particular uplink transmission is the same as the Transmission Control Indication (TCI) state or quasi co-location (QCL) of a particular downlink channel. The transceiver unit 220 may also perform the specific uplink transmission using the spatial relationship.

In addition, when spatial relationship information is not set by Sounding Reference Signal (SRS) setting information, control section 210 may assume that the spatial relationship is the same as the TCI state or the QCL.

Furthermore, in a case where there is no field indicating the spatial relationship in a Radio Resource Control (RRC) information element used for the setting of the specific uplink transmission, control section 210 may conceive that: the spatial relationship is assumed to be the same as the activated TCI state or QCL of the control resource set having the lowest control resource set ID in the latest time slot and associated with the monitored search space.

In addition, when the higher layer parameter indicating the spatial relationship information for the specific type of SRS resource is not set, control section 210 may assume that the spatial relationship is the same as the activated TCI state of the specific downlink channel or the activated TCI state or QCL of the control resource set associated with the monitored search space and having the lowest control resource set ID in the latest slot.

In addition, in a frequency higher than 6GHz (FR2), when spatial relationship information is not set by the SRS setting information, control section 210 may assume that the spatial relationship is the same as the TCI state or the QCL.

(hardware construction)

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

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

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 6 は is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

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

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

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

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

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

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

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

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

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

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

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

(modification example)

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS, Pilot (Pilot), Pilot Signal, or the like, depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

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

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

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

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

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

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

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

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

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

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

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

The Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and the number of subcarriers included in one or a plurality of consecutive subcarriers (subcarriers) RB in the frequency domain may be the same regardless of the parameter set (numerology), for example, may be 12. The number of subcarriers included in the RB may also be decided based on the parameter set.

The RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of 1 TTI and 1 subframe may be configured by one or more resource blocks.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Also, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

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

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

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation Mobile communication System (4th generation Mobile communication System (4G)), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (FRA), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio (NR), New Radio Access (NX)), Future Radio Access (FX)), Global Mobile communication System (Global for Mobile) Mobile communication System (GSM), Mobile Radio Access (CDMA SUPER Mobile registration (2000), CDMA (CDMA))), Long Term Evolution (LTE-Advanced), LTE-Advanced (LTE-a), LTE-Advanced (LTE-B), LTE-Advanced (4G), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (New Radio Access (FX), New Radio Access (NR), New Radio Access (n) (Mobile Radio Access (NX)), New Radio Access (CDMA SUPER Mobile communication System (CDMA, etc.)) -Mobile communication System, etc.) Bluetooth (registered trademark)), a system using another appropriate system, and a next generation system expanded based on these. Further, a combination of a plurality of systems (for example, LTE, or a combination of LTE-a and 5G) may be applied.

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

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

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

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

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

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

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

In the present disclosure, in the case of connecting two elements, it can be considered to use more than one wire, cable, printed electrical connection, etc., and as some non-limiting (non-limiting) and non-inclusive examples, two elements are "connected" or "combined" with each other using electromagnetic energy having a wavelength of a wireless frequency domain, a microwave domain, a light (visible and invisible) domain.

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

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

In the present disclosure, where articles are added as a result of translation, such as a, an, and the in english, the present disclosure may also include nouns that follow the articles in plural forms.

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