CN112586054B - User terminal and wireless communication method - Google Patents

Abstract

In a future wireless communication system, particularly when URLLC is set, in order to appropriately control a reception operation in a user terminal when a downlink channel is set by a symbol of a set measurement reference signal, an embodiment of the user terminal of the present invention includes: a receiving unit that receives a specific reference signal and a downlink channel; and a control unit configured to control reception of the reference signal and the downlink channel according to whether downlink transmission using a specific Modulation and Coding Scheme (MCS) table can be set when the reference signal and the downlink channel are set to the same time resource.

Description

User terminal and wireless communication method

Technical Field

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

Background

In existing LTE systems (e.g., rel.8-14), user terminals (User Equipment (UE)) use a particular reference signal or resources for the reference signal to measure channel conditions. The reference signal for channel state measurement may be also referred to as CSI-RS (channel state Information reference signal (CHANNEL STATE Information REFERENCE SIGNAL)) or the like (non-patent document 1).

Prior art literature

Non-patent literature

Non-patent document 1：3GPP TS 36.213V13.10.0"Technical Specification Group Radio Access Network;Evolved Universal Terrestrial Radio Access(E-UTRA);Physical layer procedures(Release)13",2018, month 6

Disclosure of Invention

Problems to be solved by the invention

In future wireless communication systems (for example, new Radio (NR)), further enhancement of mobile broadband (enhanced mobile broadband (enhanced Mobile Broadband (eMBB))), realization of a plurality of simultaneously connected machine type communications (large-scale machine type communications (MASSIVE MACHINE TYPE Communications (mMTC))), highly Reliable and Low-delay communications (Ultra-Reliable and Low-Latency Communications (URLLC)), and the like are used examples, for example, in URLLC, higher delay reduction than eMBB and higher reliability than eMBB are demanded.

In the current specification, the user terminal does not contemplate (not expect) setting transmission/reception of physical resources (e.g., physical downlink control channel (Physical Downlink Control Channel (PDCCH)), physical downlink shared channel (Physical Downlink SHARED CHANNEL (PDSCH)))) by symbols of a set measurement reference signal (e.g., CSI-RS or synchronization signal block (Synchronization Signal Block (SSB)). That is, the simultaneous reception of a reference signal for measurement (for example, CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) has not been studied sufficiently.

The present invention has been made in view of the above, and an object of the present invention is to provide a user terminal and a radio communication method capable of appropriately controlling a reception operation in a case where reception of a downlink channel (PDCCH or PDSCH) is set by a symbol of a reference signal (e.g., CSI-RS or SSB) for measurement, in a future radio communication system, particularly focusing on a case where URLLC is set.

Means for solving the problems

An aspect of the user terminal of the present invention is characterized by comprising: a receiving unit that receives a specific reference signal and a downlink channel; and a control unit configured to control reception of the reference signal and the downlink channel according to whether downlink transmission using a specific Modulation and Coding Scheme (MCS) table can be set when the reference signal and the downlink channel are set to the same time resource.

Effects of the invention

According to the present invention, in a future wireless communication system, in particular, in a case where URLLC is set, a reception operation in a case where reception of a downlink channel (PDCCH or PDSCH) is set by a symbol of a set measurement reference signal (e.g., CSI-RS or SSB) can be appropriately controlled.

Drawings

Fig. 1A and 1B are diagrams showing an example of MCS tables 1 and 2.

Fig. 2 is a diagram showing an example of MCS table 3.

Fig. 3 is a diagram showing an example of a configuration of determining an MCS table applied by a user terminal.

Fig. 4 is a diagram showing an example of conditions that can be set URLLC.

Fig. 5 is a diagram showing an example of conditions that can be set URLLC.

Fig. 6 is a diagram showing an example of conditions that can be set URLLC.

Fig. 7A and 7B are diagrams illustrating an example of a scheme that is conceived in a user terminal capable of simultaneously receiving a plurality of beams.

Fig. 8 is a diagram showing an example of a schematic configuration of the radio communication system according to the present embodiment.

Fig. 9 is a diagram showing an example of the functional configuration of the radio base station according to the present embodiment.

Fig. 10 is a diagram showing an example of a functional configuration of a baseband signal processing section of a radio base station.

Fig. 11 is a diagram showing an example of a functional configuration of a user terminal according to the present embodiment.

Fig. 12 is a diagram showing an example of a functional configuration of a baseband signal processing section of a user terminal.

Fig. 13 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.

Detailed Description

(QCL/TCI)

In future wireless communication systems, for example, new Radio (NR), communication by Beam Forming (BF) is being studied, and therefore, a user terminal is being studied to control a transmission/reception process of a channel based on a state (TCI state) of a transmission setting indicator (Transmission Configuration Indicator (TCI)) of the channel.

The TCI state refers to information related to Quasi Co-Location (QCL) of a channel or signal, also called spatial reception parameters, spatial information (spatial info), etc. For each channel or each signal, a TCI state is assigned to the user terminal. The user terminal may determine at least one of a transmission beam (Tx beam) and a reception beam (Rx beam) of each channel based on the TCI state designated for each channel.

Quasi co-location (QCL) is an indicator representing the statistical properties of at least one of the channel and the signal (channel/signal). In the case where a certain signal or channel is quasi co-located (QCL) with other signals or channels, at least one of the doppler shift, doppler dispersion, average delay, delay spread, and spatial parameters (e.g., spatial reception parameters) may be assumed to be the same (QCL with respect to at least one of them) among these different signals or channels.

The spatial reception parameters may also correspond to the reception beams (Rx beams) (e.g., reception analog beams) of the user terminal, or the beams may be determined based on the spatial QCL. QCL and at least one element in QCL in the present disclosure may be replaced by sQCL (space QCL (spatial QCL)).

In the case of quasi co-location (QCL), multiple QCL types may be specified. For example, 4 QCL types (QCL type a to QCL type D) that can be assumed to be different for the same parameter or parameter set (PARAMETER SET) may also be set.

QCL type a is a QCL that can assume doppler shift, doppler spread, average delay, and delay spread to be the same.

QCL type B is QCL that can assume that the doppler shift and doppler dispersion are the same.

QCL type C is QCL that can assume the average delay and doppler shift to be the same.

QCL type D is QCL that can assume that the spatial reception parameters are the same.

Information (QCL information, QCL-info) about quasi co-location (QCL) may also be specified for each channel. The QCL information for each channel may also contain (or may also be shown) at least one of the following:

Information representing the above QCL type (QCL type information)

Information (RS information) related to reference signals (REFERENCE SIGNAL (RS)) relating to QCL for each channel

Information indicating the carrier (cell) on which the Reference Signal (RS) is located

Information indicating a bandwidth portion (Band WIDTH PART (BWP)) in which the Reference Signal (RS) is located

Information representing spatial reception parameters (e.g., reception beams (Rx beams)) of each channel.

In case there is a specific quasi co-located (QCL) relationship between the different signals (e.g. QCL type D), it is envisaged to receive with the same beam.

(URLLC)

In future wireless communication systems (for example, NR), use cases such as further enhancement of mobile broadband (enhanced mobile broadband (enhanced Mobile Broadband (eMBB))), realization of a plurality of simultaneously connected machine type communications (large-scale machine type communications (MASSIVE MACHINE TYPE Communications (mMTC))), and highly Reliable and Low-delay communications (Ultra-Reliable and Low-Latency Communications (URLLC)) are envisaged. For example, in URLLC, a higher delay cut than eMBB and higher reliability than eMBB are required.

In this way, in future wireless communication systems, it is assumed that a plurality of services having different requirements for delay reduction and reliability coexist. Therefore, it is being studied to flexibly control transmission and reception of signals for a plurality of services of different requirements.

In a future wireless communication system (for example, NR), it is assumed that a new modulation and coding scheme (Modulation and Coding Scheme (MCS)) table and a CQI (channel quality indicator (Channel Quality Indicator)) table, which are not specified in an existing LTE system, are introduced in order to correspond to various use cases. The new table may be a content defining a candidate (index) having a lower coding rate than the existing table.

When a new MCS table is introduced, it is considered to use a specific RNTI (radio network temporary identifier (Radio Network Temporary Identifier)) (which may be also referred to as a new RNTI or MCS RNTI) in order to specify the new MCS table. An example of an MCS table and an RNTI newly introduced in a future radio communication system will be described below.

In future wireless communication systems (for example, NR), it is studied to control at least one of the modulation scheme (or the number of modulations) and the coding rate (modulation number/coding rate) of a physical shared channel scheduled by downlink control information (Downlink Control Information (DCI)) based on a specific field included in the DCI. For example, the user terminal controls the reception process of the PDSCH based on MCS fields included in DCI (e.g., DCI format 1_0, DCI format 1_1) of a scheduled downlink shared channel (physical downlink shared channel (Physical Downlink SHARED CHANNEL (PDSCH)).

Specifically, the user terminal receives the PDSCH based on a table (also referred to as an MCS table) defined by associating an MCS index, a modulation order (modulation order), and a coding rate (code rate), and an MCS index designated by DCI. Similarly, the user terminal transmits the PUSCH based on the MCS index specified by the DCI for scheduling the MCS table and the Uplink shared channel (Physical Uplink SHARED CHANNEL (PUSCH)).

Each modulation number is a value corresponding to each modulation scheme. For example, the number of modulations of QPSK (Quadrature phase shift keying (PHASE SHIFT KEYING)) corresponds to 2, the number of modulations of 16QAM (Quadrature amplitude modulation (Quadrature Amplitude Modulation)) corresponds to 4, the number of modulations of 64QAM corresponds to 6, and the number of modulations of 256QAM corresponds to 8.

Fig. 1 is a diagram showing an example of an MCS table. The values of the MCS table shown in fig. 1 are merely examples, and are not limited thereto. Further, a part of items (for example, spectrum efficiency) associated with the MCS index (I _MCS) may be omitted, or other items may be added.

In fig. 1A, QPSK, 16QAM, and 64QAM are specified as modulation times. In fig. 1B, QPSK, 16QAM, 64QAM, and 256QAM are specified as the modulation times. In fig. 1A and 1B, the minimum coding rate (MCS index 0) is defined as 120 (×1024).

The MCS table of fig. 1A may also be referred to as MCS table 1, 64QM table or qam64 for PDSCH. The MCS table of fig. 1B may also be referred to as MCS table 2 for PDSCH, 256QAM table, or QAM. The 64QAM table and the 256QAM table as shown in fig. 1 are also specified in the existing LTE system.

In future wireless communication systems (e.g., NR), cases (e.g., URLLC) are envisaged where lower latency and higher reliability are required than in existing LTE systems. In order to cope with this, it is assumed that a new MCS table different from the MCS table defined in the existing LTE system is introduced.

Fig. 2 shows an example of a new MCS table. The values of the MCS table shown in fig. 2 are merely examples, and are not limited thereto. In fig. 2, QPSK, 16QAM, and 64QAM are specified as modulation times, and a coding rate (MCS index 0) defined to be minimum is 30 (×1024). The MCS table of fig. 2 may be referred to as MCS table 3 for PDSCH, new MCS table or qam to 64 to LowSE.

In this way, the new MCS table (MCS table 3) may be a table defining a lower coding rate (for example, 30) than the minimum coding rate (for example, 120) defined in the MCS tables (MCS table 1, MCS table 2) shown in fig. 1. Alternatively, when comparing MCS table 3 with MCS table 1 or MCS table 2, the coding rate in the same MCS index may be set to be lower.

The user terminal may select an MCS table to be used for determining the number of modulations/coding rate of the PDSCH based on at least one of the following conditions (1) to (3).

(1) The presence or absence of setting of a specific RNTI (new RNTI, e.g., mcs-C-RNTI)

(2) Notification of information specifying MCS table (MCS table information)

(3) Type of RNTI applied to cyclic redundancy check (Cyclic Redundancy Check (CRC)) scrambling of at least one of DCI (or PDCCH) and PDSCH

The MCS table information may also be information specifying one of MCS table 1, MCS table 2 (e.g., qam) and MCS table 3 (e.g., qam LowSE). Or the MCS table information may be information specifying one of MCS table 2 (e.g., qam and 256) and MCS table 3 (e.g., qam and LowSE).

In the case where MCS table 2 (e.g., qam256,256) is set, the user terminal applies MSC table 2 to control reception of PDSCH.

When a new MCS table (MCS table 3, for example qam to LowSE) is set, the user terminal may determine an MCS table to be applied based on the type of search space used for DCI transmission.

Fig. 3 is a diagram showing an example of a configuration of determining an MCS table applied by a user terminal. In fig. 3, "RRC-configured MCS table (RRC-configured MCS table)" means an MCS table set by a higher layer (e.g., RRC ((radio resource control (Radio Resource Control)) signaling), "RRC-configured RNTI" means one of MCS table 1 (qam), MCS table 2 (qam) 256) and MCS table 3 (qam) LowSE, "C" means a C-RNTI, "new (new)" means a new RNTI scrambling DCI (RNTI scrambling DCI) "means an RNTI category to which a CRC of DCI is applied," C "means a C-RNTI," new (new) "means DCI format (DCI format)" means DCI transmitted in a search space, "1_0" means DCI format 1_1.+ - (SEARCH SPACE) "means a search space to transmit DCI," Common (Common) search space "means a Common UE" means a search space, "MCS Used by a UE" and "table 38" means MCS (MCS Used in a table of fig. 35) of fig. 3, fig. 38, and "new (new)" means DCI format 1_0 "means DCI transmitted in a search space," MCS table 1_1"," 1_1 "means MCS Used in a search space," MCS table (table 3898) "means MCS Used in a table 38) and" table (table 38) of fig. 38.

As shown in fig. 3, the user terminal may determine an MCS table to be applied based on an MCS table and an RNTI type set by a higher layer (e.g., RRC signaling), an RNTI type applied to scrambling of DCI, a DCI format, and a search space in which DCI is transmitted.

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, for example qam, lowSE) in a case where MCS table 1 (for example qam, 64) is set through a higher layer (for example, RRC signaling), C-RNTI (Cell-RNTI) or a new (new) RNTI is set through a higher layer (for example, RRC signaling), CRC of DCI is scrambled through the new RNTI, DCI (DCI format 1_0 or DCI format 1_1) is transmitted through a common (common) search space or a UE-specific search space. In this case, the user terminal receives PDSCH using a new MCS table (MCS table 3, for example qam to LowSE).

As shown in fig. 3, when the user terminal sets MCS table 2 (e.g., qam) by a higher layer (e.g., RRC signaling), sets C-RNTI or a new RNTI by a higher layer (e.g., RRC signaling), and the CRC of the DCI is scrambled by the new RNTI, the DCI (DCI format 1_0 or DCI format 1_1) is transmitted through the common search space or the UE-specific search space, a new MCS table (MCS table 3, e.g., qam64 LowSE) is applied. In this case, the user terminal receives PDSCH using a new MCS table (MCS table 3, for example qam to LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, for example qam64 LowSE) in a case where MCS table 3 (for example qam64 LowSE) is set through a higher layer (for example RRC signaling), C-RNTI or a new RNTI is set through a higher layer (for example RRC signaling), CRC of DCI is scrambled through the new RNTI, and DCI (DCI format 1_0 or DCI format 1_1) is transmitted through a common search space or a UE-specific search space. In this case, the user terminal receives PDSCH using a new MCS table (MCS table 3, for example qam to LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, for example, qam64 LowSE) in a case where MCS table 3 (for example, qam64 LowSE) is set through a higher layer (for example, RRC signaling), C-RNTI is set through a higher layer (for example, RRC signaling), CRC of DCI is scrambled through the C-RNTI, and DCI (DCI format 1_0) is transmitted through the UE-specific search space. In this case, the user terminal receives PDSCH using a new MCS table (MCS table 3, for example qam to LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, for example qam64 LowSE) in a case where MCS table 3 (for example qam64 LowSE) is set through a higher layer (for example RRC signaling), C-RNTI is set through a higher layer (for example RRC signaling), CRC of DCI is scrambled through the C-RNTI, DCI (DCI format 1_1) is transmitted through a common search space or a UE-specific search space. In this case, the user terminal receives the PDSCH using a new MCS table (MCS table 3, for example qam to LowSE).

The MCS table may be set separately for uplink (PUSCH transmission) and downlink (PDSCH reception).

The presence or absence of setting of a new MCS Table (MCS Table 3, for example, qam to LowSE) may be notified by a higher layer parameter (for example, MCS-Table) for PDSCH transmitted by Semi-persistent scheduling (Semi-PERSISTENT SCHEDULING, DL-SPS). The setting of the new MCS table for DL-SPS may be set independently from DCI-based PDSCH transmission (grant-based DL scheduling).

In this way, in future wireless communication systems (for example, NR), various use cases (for example, URLLC) having different requirements are assumed, and a new MCS table with a lower coding rate being defined is supported.

In the present specification, it is also conceivable that at least one of Downlink (DL) transmission and Uplink (UL) transmission to which a new MCS table (MCS table 3, for example qam64 LowSE) is applied is URLLC.

In future wireless communication systems (e.g., NRs), measurements using synchronization signal blocks (Synchronization Signal Block (SSBs)) are made in addition to measurements using CSI-RS.

The Synchronization Signal Block (SSB) may also be a signal block including a synchronization signal and a broadcast channel. This signal block may also be referred to as an SS/PBCH block. The synchronization signal may be at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)), for example.

In the current specification, the user terminal does not contemplate (not expect) setting transmission and reception of physical resources (e.g., PDCCH, PDSCH, PUCCH, PUSCH) by symbols to which measurement reference signals (e.g., CSI-RS or SSB) are set. That is, there is no sufficient study on simultaneous reception of a reference signal for measurement (e.g., CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH).

Simultaneous reception of a measurement reference signal (e.g., CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) means that a user terminal receives at least a part of the measurement reference signal and the downlink channel overlapping each other in a time resource (e.g., symbol).

When an analog beam is used for transmitting a signal, in particular, in the second Frequency band (Frequency Range 2 (FR 2)), the reference signal for measurement (for example, CSI-RS or SSB) and the downlink channel are set to beams (TCI states) other than QCL type D by the same symbol, and when the user terminal can only form one reception beam, the reference signal for measurement and the downlink channel cannot be received at the same time. In this case, it is problematic for the user terminal to receive either the reference signal for measurement or the downlink channel.

Accordingly, the present inventors have studied specifically the operation of a user terminal in a case where reception of a downlink channel (PDCCH or PDSCH) is set by a symbol of a reference signal for measurement (e.g., CSI-RS or SSB) being set, that is, in a case where the reference signal for measurement and the downlink channel are set to the same symbol, in a future wireless communication system, particularly, focusing on a case where URLLC is set.

The wireless communication method according to the present embodiment is described in detail below with reference to the drawings. In the following description, a case where CSI-RS is set as a reference signal for measurement is described, but it may be replaced with a Synchronization Signal Block (SSB).

(First mode)

In the first embodiment, an operation of a user terminal in a case where a reference signal for measurement (for example, CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) are set to the same symbol and are not in a specific quasi co-location (for example, QCL type D) will be described.

If the measurement reference signal (e.g., CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) are set to the same symbol and are not of QCL type D, the user terminal may receive the downlink channel (PDCCH or PDSCH) for URLLC preferentially, and otherwise, may receive the measurement reference signal (e.g., CSI-RS or SSB) and measure the channel state.

First, an operation of a user terminal in a case where a reference signal for measurement (e.g., CSI-RS or SSB) and a PDCCH are set to the same symbol and are not QCL type D will be described. The user terminal may prioritize different signals or channels between the case where the setting URLLC can be set and the case other than that.

Fig. 4 is a diagram showing an example of conditions under which URLLC can be set. Since the user terminal has not received the PDCCH yet, if the C-RNTI or the new RNTI is set by a higher layer (e.g., RRC signaling) as enhanced by a diagonal line in fig. 4, it is determined that there is a possibility that a new MCS table (MCS table 3, e.g., qam64 LowSE) (1 or 2 in fig. 4) is applied, that is, URLLC can be set.

Or as enhanced with diagonal lines in fig. 4, when the user terminal sets MCS table 3 (for example qam to LowSE) by a higher layer (for example, RRC signaling), it is determined that there is a possibility that a new MCS table (MCS table 3, for example, qam to LowSE) is applied (fig. 4 (3)), that is, it is set to URLLC to be able to be set.

If the user terminal determines that the PDCCH can be set by a higher layer (e.g., RRC) to URLLC, the user terminal may receive the PDCCH preferentially without receiving the measurement reference signal (e.g., CSI-RS or SSB). In other cases, the user terminal may also receive a reference signal for measurement (e.g., CSI-RS or SSB) and measure a channel state without receiving the PDCCH.

Second, an operation of the user terminal in the case where the measurement reference signal (e.g., CSI-RS or SSB) and PDSCH are set to the same symbol and are not QCL type D will be described. The user terminal may prioritize different signals or channels between the case that URLLC is set and the other case.

Fig. 5 is a diagram showing an example of conditions that URLLC can be set. Since the user terminal has detected the PDCCH (DCI), as enhanced by the diagonal line in fig. 5, the C-RNTI or the new RNTI is set by a higher layer (for example, RRC signaling), and when the CRC of the DCI scheduled for the PDSCH is scrambled by the new RNTI and the DCI (DCI format 1_0 or DCI format 1_1) is transmitted in the common search space or the UE-specific search space, it is determined that the new MCS table (MCS table 3, for example, qam to LowSE) is applied (fig. 5, (1) or (2)), that is, URL is set.

Or as enhanced with diagonal lines in fig. 5, when the user terminal sets MCS table 3 (e.g., qam to LowSE) by a higher layer (e.g., RRC signaling), sets C-RNTI or new RNTI by a higher layer (e.g., RRC signaling), scrambles CRC of DCI scheduled for PDSCH by the new RNTI, and DCI (DCI format 1_0 or DCI format 1_1) is transmitted by a common search space or UE-specific search space, it is determined that a new MCS table (MCS table 3, e.g., qam to 64 LowSE) is applied (3) in fig. 5), that is, URLLC is set.

Or as enhanced with diagonal lines in fig. 5, the user terminal sets MCS table 3 (e.g., qam and LowSE) by a higher layer (e.g., RRC signaling), sets C-RNTI by a higher layer (e.g., RRC signaling), and if the CRC of DCI scheduled for PDSCH is scrambled by C-RNTI and DCI (DCI format 1_0) is transmitted through the UE-specific search space, determines that a new MCS table (MCS table 3, e.g., qam and LowSE) is applied (fig. 5, (4)), that is, URL is set.

Or as enhanced with diagonal lines in fig. 5, when the user terminal sets MCS table 3 (e.g., qam to LowSE) by a higher layer (e.g., RRC signaling), sets C-RNTI by a higher layer (e.g., RRC signaling), and the CRC of DCI scheduled for PDSCH is scrambled by C-RNTI, DCI (DCI format 1_1) is transmitted through a common search space or UE-specific search space, it is determined that a new MCS table (MCS table 3, e.g., qam to LowSE) is applied (fig. 5 (5)), that is, URLLC is set.

If URLLC is set, the user terminal may preferentially receive PDSCH without receiving a measurement reference signal (e.g., CSI-RS or SSB). In addition, the user terminal may also receive a reference signal for measurement (e.g., CSI-RS or SSB) and measure a channel state without receiving the PDSCH.

According to the first aspect, when the reference signal for measurement (for example, CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) are set to the same symbol and each is not a specific quasi co-location (for example, QCL type D), a user terminal other than URLLC (URLLC is not set) can preferentially receive the reference signal for measurement (for example, CSI-RS or SSB) and perform beam control and channel quality measurement, and therefore, communication quality can be improved. URLLC can be set, and the user terminal can preferentially receive the downlink channel (PDCCH or PDSCH) for URLLC, so that the delay can be reduced.

(Second mode)

In the second embodiment, an operation of a user terminal in a case where an Aperiodic CSI-RS (an Aperiodic CSI-RS, an a-CSI-RS) and a downlink channel (PDCCH or PDSCH) are set to the same symbol and are not each specifically quasi-co-located (for example, QCL type D) will be described.

Aperiodic CSI-RS (a-CSI-RS) set means that CSI requests (triggers) are dynamically made from the base station. For the user terminal URLLC set, it is assumed that the aperiodic CSI-RS (a-CSI-RS) has higher priority than the reference signal for measurement (e.g., CSI-RS or SSB) described in the first aspect.

First, an operation of a user terminal in a case where aperiodic CSI-RS (a-CSI-RS) and PDCCH are set to the same symbol and are each not QCL type D will be described. The user terminal may prioritize different signals or channels between the case where the setting URLLC can be set and the case other than that.

Fig. 6 is a diagram showing an example of conditions that URLLC can be set. Since the user terminal has not received the PDCCH yet, if the C-RNTI or the new RNTI is set by a higher layer (e.g., RRC signaling) as enhanced by a diagonal line in fig. 6, it is determined that there is a possibility that a new MCS table (MCS table 3, e.g., (qam) 64 LowSE)) is applied ((1) or (2) in fig. 6), that is, URLLC can be set.

Or as enhanced with diagonal lines in fig. 6, when MCS table 3 (e.g., qam64 LowSE) is set by a higher layer (e.g., RRC signaling), the user terminal determines that there is a possibility that a new MCS table (MCS table 3, e.g., qam64 LowSE) is applied (fig. 6 (3)), that is, URLLC can be set.

In case that the setting URLLC can be set, the user terminal may also receive the PDCCH preferentially without receiving the aperiodic CSI-RS (a-CSI-RS).

Here, as enhanced with a thin oblique line in fig. 6, when the CRC of the DCI triggering the aperiodic CSI-RS (a-CSI-RS) is scrambled with a new RNTI, the user terminal determines that a new MCS table (MCS table 3, for example qam64 LowSE) is applied ((1) or (2) in fig. 6), that is, URLLC is set.

In case URLLC is set, the user terminal may also prioritize aperiodic CSI-RS (a-CSI-RS), receive the aperiodic CSI-RS (a-CSI-RS) and measure a channel state without receiving PDCCH.

In other cases (URLLC cannot be set or URLLC is not set), the user terminal may also receive an aperiodic CSI-RS (a-CSI-RS) and measure a channel state without receiving a PDSCH.

Second, an operation of the user terminal in the case where the aperiodic CSI-RS (a-CSI-RS) and PDSCH are set to the same symbol and are not QCL type D, respectively, will be described. The user terminal may prioritize different signals or channels between the case that URLLC is set and the other case.

Since the user terminal has detected the PDCCH (DCI), as enhanced by the diagonal line in fig. 5, the C-RNTI or the new RNTI is set by a higher layer (for example, RRC signaling), and when the CRC of the DCI scheduled for the PDSCH is scrambled by the new RNTI and the DCI (DCI format 1_0 or DCI format 1_1) is transmitted in the common search space or the UE-specific search space, it is determined that the new MCS table (MCS table 3, for example, qam to LowSE) is applied (fig. 5, (1) or (2)), that is, URLLC is set.

Or as emphasized by diagonal lines in fig. 5, MCS table 3 (e.g., qam64 LowSE) is set by a higher layer (e.g., RRC signaling), C-RNTI or new RNTI is set by a higher layer (e.g., RRC signaling), CRC of DCI scheduled for PDSCH is scrambled by the new RNTI, and when DCI (DCI format 1_0 or DCI format 1_1) is transmitted through a common search space or UE-specific search space, the user terminal determines that the new MCS table (e.g., qam LowSE) is applied (fig. 5 (3)), that is, URLLC is set.

Or as emphasized by diagonal lines in fig. 5, MCS table 3 (e.g., qam64 LowSE) is set by a higher layer (e.g., RRC signaling), C-RNTI is set by a higher layer (e.g., RRC signaling), CRC of DCI scheduled for PDSCH is scrambled by C-RNTI, and when DCI (DCI format 1_0) is transmitted through a UE-specific search space, the user terminal determines that a new MCS table (MCS table 3, e.g., qam64 LowSE) is applied (fig. 5 (4)), that is, URLLC is set.

Or as emphasized by diagonal lines in fig. 5, MCS table 3 (e.g., qam64 LowSE) is set by a higher layer (e.g., RRC signaling), C-RNTI is set by a higher layer (e.g., RRC signaling), CRC of DCI scheduled for PDSCH is scrambled by C-RNTI, and when DCI (DCI format 1_1) is transmitted through a common search space or a UE-specific search space, the user terminal determines that a new MCS table (MCS table 3, e.g., qam LowSE) is applied (5 in fig. 5), that is, URLLC is set.

In case URLLC is set, the user terminal may also preferentially receive PDSCH without receiving aperiodic CSI-RS (a-CSI-RS).

Wherein, in case URLLC is set, in case that the CRC of the DCI triggering the aperiodic CSI-RS (a-CSI-RS) is scrambled with a new RNTI, the user terminal may also prioritize the aperiodic CSI-RS (a-CSI-RS), receive the aperiodic CSI-RS (a-CSI-RS), and measure the channel state without receiving the PDSCH.

In other cases (in the case that URLLC is not set), the user terminal may also receive an aperiodic CSI-RS (a-CSI-RS) and measure a channel state without receiving the PDSCH.

According to the second aspect, when the aperiodic CSI-RS (a-CSI-RS) and the downlink channel (PDCCH or PDSCH) are set to the same symbol and each is not a specific quasi co-location (e.g., QCL type D), a user terminal other than URLLC (URLLC is not set) preferentially receives the aperiodic CSI-RS (a-CSI-RS), and can perform beam control and channel quality measurement, so that communication quality can be improved. URLLC can be set, and the user terminal can preferentially receive the downlink channel (PDCCH or PDSCH) for URLLC, so that the delay can be reduced. The user terminal URLLC configured can preferentially receive the aperiodic CSI-RS (a-CSI-RS) and prioritize the response to the aperiodic CSI request over the reception of the downlink channel.

(Third mode)

In the third aspect, the UE may report to the network whether or not multiple beams can be received simultaneously through UE capability information (UE capability). It is also conceivable that a user terminal reporting the ability to simultaneously receive multiple beams receives a reference signal for measurement (e.g., CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) simultaneously regardless of whether each is a specific quasi co-location (e.g., QCL type D).

A user terminal that does not report the UE capability information may also assume that the same operation as a user terminal that reported that multiple beams cannot be received simultaneously is performed.

The user terminal may also report whether multiple beams can be simultaneously received in 1 bit through the UE capability information. The user terminal may also report that up to several beams can be supported in case of being able to receive multiple beams simultaneously.

Fig. 7 is a diagram showing an example of a scheme that is assumed in a user terminal capable of simultaneously receiving a plurality of beams. As shown in fig. 7A, a user terminal capable of receiving multiple beams simultaneously is envisioned to support digital beams. Or as shown in fig. 7B, a user terminal capable of receiving multiple beams simultaneously is supposed to support multiple panels (multi-panel).

Digital beams are a method of pre-coding signal processing on baseband (digital signals). In this case, parallel processing of inverse fast fourier transform (INVERSE FAST Fourier Transform (IFFT)), digital-to-analog transform (Digital to Analog Converter (DAC)), or RF (Radio Frequency) needs to be equivalent to the number of antenna ports (RF chains). A user terminal supporting digital beams can form a number of beams corresponding to the number of antenna ports at an arbitrary timing.

(Fourth mode)

In the fourth aspect, the UE may also report whether or not to support URLLC to the network through UE capability information (UE capability). The operations of the user terminal described in the first or second aspect may also be limited to be applied to a terminal that reports through UE capability information when URLLC is supported.

The user terminal may also report whether URLLC is supported in 1 bit through the UE capability information.

The user terminal may report a combination of RNTIs that can be set. The user terminal can also envisage support URLLC in case a new RNTI is included in the combination of reported RNTIs.

The user terminal may also report combinations of MCS tables that can be set. The user terminal may also envisage support URLLC in case a new MCS table (MCS table 3, e.g. qam64 LowSE) is included in the combination of reported MCS tables.

(Fifth mode)

In the fifth aspect, when the measurement reference signal (for example, CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) are set to the same symbol and are not in a specific quasi co-location (for example, QCL type D), the priority of reception may be changed according to the use of the measurement reference signal when the user terminal cannot receive the measurement reference signal and the downlink channel at the same time.

The priority may be changed according to what purpose the measurement reference signal (e.g., CSI-RS or SSB) is. Examples of the application include radio resource Management (Radio Resource Management (RRM)) (Layer 3 measurement (Layer 3 (L3)), radio link monitoring (Radio Link Monitor (RLM)), beam failure detection (Beam Failure Detection (BFD)), beam Management (BM)) (Layer 1 reference signal received Power measurement (Layer 1 (L1) REFERENCE SIGNAL RECEIVED Power (RSRP)) (Layer 1 reference signal received Quality measurement (L1 REFERENCE SIGNAL RECEIVED Quality (RSRQ) measurement)) (signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR))), and CSI measurement.

For example, even if the reference signal for Radio Resource Management (RRM) is a Synchronization Signal Block (SSB), the priority may be set lower than that of CSI-RS, and the reference signal for Beam Management (BM) or Radio Link Monitoring (RLM) may be preferentially received. This makes it possible to properly manage beams in wireless communication, and thus to suppress degradation of communication quality in a communication system using beams.

Alternatively, the priority of the reference signal or the downlink channel may be determined according to the purpose of the reference signal. For example, the user terminal may be configured to receive a reference signal for use with a high priority, and not to receive other reference signals in the same symbol as or a symbol before and after the symbol for which the reference signal is set.

This makes it possible to preferentially perform an operation that is more important for communication, and thus to suppress degradation of communication quality.

The usage of the reference signals may be set according to the order of priority from high to low, for example, to priority 1: beam Management (BM) (L1 RSRP measurement), priority 2: beam Failure Detection (BFD), priority 3: radio Link Monitoring (RLM), priority 4: CSI measurement, priority 5: radio Resource Management (RRM) (L3 measurement). The user terminal may prioritize the reference signal if it is a use with priority 1 or more, and may prioritize the downlink channel (PDCCH or PDSCH) in addition to this.

The user terminal may prioritize the reference signal if it is a use with priority 1 or more, and may prioritize the PDCCH in addition to this.

The user terminal may prioritize the reference signal if it is a use with priority 3 or more, and may prioritize PDSCH in addition to this.

This is because it can be assumed that Beam Management (BM) with a high priority is required to prevent beam failure or link failure, and that even if CSI measurement or Radio Resource Management (RRM) is not received, the immediate characteristics are not degraded.

When the measurement reference signal (for example, CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) are set to each component carrier (Component Carrier (CC)) for carrier aggregation and each is not a specific quasi co-location (for example, QCL type D), one of the reference signal and the downlink channel may be received by determining the priority according to the type or use of the signal or the type of the cell.

In this way, the user terminal can preferentially receive the reference signal in the cell having the higher priority in the communication, and therefore, can suppress the quality degradation of the more important communication.

The priority may be determined in consideration of the use of the reference signal, the type of the cell, the cell index, the frequency band of the cell, and the like.

When the type of the Cell is considered, the primary and Secondary cells (Primary Secondary Cell (PS Cell)) may be prioritized over the Secondary cells (SCell), and the primary Cell (PRIMARY CELL (PCell)) may be prioritized over the PSCell. That is, in order of priority from high to low, PCell > PS Cell > SCell.

The minimum CC index (the lowest CC index) or the maximum CC index (THE LARGEST CC index) may also be prioritized with consideration of the cell index.

When considering the frequency band of the cell, the first frequency band (FR 1) may be prioritized over the second frequency band (FR 2) (FR 1 > FR 2), or the second frequency band (FR 2) may be prioritized over the first frequency band (FR 1) (FR 2 > FR 1).

The first frequency band (FR 1) may be, for example, a frequency band (sub-6 GHz) of 6GHz or less. The second frequency band (FR 2) may also be a frequency band (above-24 GHz) higher than 24 GHz. The first frequency band (FR 1) may also be defined as a frequency range using at least one of 15, 30 and 60kHz as a subcarrier spacing (Sub-CARRIER SPACING (SCS)). The second frequency band (FR 2) may also be defined as using a frequency range of at least one of 60 and 120kHz as the subcarrier spacing (SCS).

The frequency bands, definitions, etc. of the first frequency band (FR 1) and the second frequency band (FR 2) are not limited to these. For example, the first frequency band (FR 1) may be a higher frequency band than the second frequency band (FR 2). The second frequency band (FR 2) may also be used only for the time division duplex (Time Division Duplex (TDD)) band. The second frequency band (FR 2) is preferably used synchronously between a plurality of base stations. When a plurality of carriers are included in the second frequency band (FR 2), the carriers are preferably operated in synchronization.

(Wireless communication System)

The configuration of the wireless communication system according to the present embodiment will be described below. In this wireless communication system, the wireless communication method of the above embodiment is applied.

Fig. 8 is a diagram showing an example of a schematic configuration of the radio communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (Carrier Aggregation (CA)) or dual connection (Dual Connectivity (DC)) in which a plurality of basic frequency blocks (component carriers, component Carrier (CCs)) each having a system bandwidth (e.g., 20 MHz) of the LTE system as 1 unit are integrated can be applied. The wireless communication system 1 may also be referred to as SUPER 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA ((future Radio access) Future Radio Access), NR (New Radio), or the like.

The wireless communication system 1 may also support dual connectivity (Multi-RAT DC (MR-DC)) between multiple RATs (radio access technologies (RadioAccessTechnology)). The MR-DC may include LTE and NR dual connectivity (E-UTRA-NR DC (EN-DC)) in which a base station (eNB) of LTE (E-UTRA) is a primary node and a base station (gNB) of NR is a secondary node, NR and LTE dual connectivity (NR-E-UTRA DC (NE-DC)) in which a base station (gNB) of NR is a primary node and a base station (eNB) of LTE is a secondary node, and the like.

The radio communication system 1 includes a base station 11 forming a macrocell C1, and base stations 12a to 12C arranged in the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. In the macrocell C1 and each small cell C2, a user terminal 20 is disposed. It may also be configured to apply different parameter sets (Numerology) between cells. The parameter set refers to a set of communication parameters that characterize the design of signals in a certain RAT.

The user terminal 20 can connect to both the base station 11 and the base station 12. The user terminal 20 envisages the simultaneous use of the macrocell C1 and the small cell C2 with different frequencies by means of Carrier Aggregation (CA) or Dual Connection (DC). The user terminal 20 can apply Carrier Aggregation (CA) or Dual Connectivity (DC) using a plurality of cells (CCs), for example, more than 2 CCs. The user terminal can utilize the licensed domain CC and the unlicensed domain CC as a plurality of cells. The TDD carrier to which the shortened TTI is applied may be included in any one of a plurality of cells.

The user terminal 20 and the base station 11 can communicate using a carrier with a narrow bandwidth (called an existing carrier, a legacy carrier (LEGACY CARRIER), etc.) in a relatively low frequency band (e.g., 2 GHz). The user terminal 20 and the base station 12 may use a carrier having a wide bandwidth in a relatively high frequency band (e.g., 3.5GHz, 5GHz, 30 to 70GHz, etc.), or may use the same carrier as the base station 11. The configuration of the frequency band used by each base station is not limited to this.

The base station 11 and the base station 12 (or the two base stations 12) may be connected by a wire (for example, an optical fiber conforming to CPRI (common public radio interface (Common Public Radio Interface)), an X2 interface, or the like) or by a wireless connection.

The base station 11 and each base station 12 are connected to the upper station device 30, respectively, and are connected to the core network 40 via the upper station device 30. The upper station device 30 includes, for example, an access gateway device, a Radio Network Controller (RNC), a Mobility Management Entity (MME), and the like, but is not limited thereto. Each base station 12 may be connected to the upper station apparatus 30 via the base station 11.

The base station 11 is a base station having a relatively wide coverage area, and may also be referred to as a macro base station, a sink node, an eNB (eNodeB), a transmission reception point, or the like. The base station 12 is a base station having a local coverage, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (home evolved node B (Home eNodeB)), an RRH (remote radio head (Remote Radio Head)), a transmission/reception point, and the like. Hereinafter, the base stations 11 and 12 are collectively referred to as a base station 10 without distinction.

Each user terminal 20 is a terminal supporting various communication schemes such as LTE and LTE-a, and may include not only a mobile communication terminal but also a fixed communication terminal.

In the wireless communication system 1, OFDMA (orthogonal frequency division multiple access) is applied to the Downlink (DL) and SC-FDMA (single carrier-frequency division multiple access) is applied to the Uplink (UL) as a radio access scheme. OFDMA is a multi-carrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier to perform communication. SC-FDMA is a single carrier transmission scheme in which a system bandwidth is divided into bands each consisting of one or consecutive resource blocks, and a plurality of terminals use different bands, thereby reducing interference between terminals. The uplink and downlink radio access schemes are not limited to a combination of these, and OFDMA may be used for the uplink.

In the wireless communication system 1, as DL channels, a downlink data channel (also referred to as a physical downlink shared channel (Physical Downlink SHARED CHANNEL (PDSCH)), a downlink shared channel, or the like), a broadcast channel (physical broadcast channel (Physical Broadcast Channel (PBCH))), an L1/L2 control channel, or the like, which is shared by the user terminals 20, is used. User data, higher layer control information, SIBs (system information blocks (System Information Block)) and the like are transmitted through the PDSCH. MIB (master information block Master Information Block)) is transmitted through PBCH.

The L1/L2 control channel includes a downlink control channel (Physical downlink control channel (Physical Downlink Control Channel (PDCCH)), an enhanced Physical downlink control channel (ENHANCED PHYSICAL Downlink Control Channel (EPDCCH)), a PCFICH (Physical Hybrid-ARQ Indicator Channel)), a PHICH (Physical Hybrid-ARQ Indicator Channel)), downlink control information (downlink control information Downlink Control Information (DCI)) including scheduling information of PDSCH and PUSCH, etc. is transmitted through the PDCCH.

In the radio communication system 1, as UL channels, uplink data channels (also referred to as Physical Uplink SHARED CHANNEL (PUSCH)), uplink shared channels, etc.), uplink control channels (Physical Uplink control channel (Physical Uplink Control Channel (PUCCH)), random access channels (Physical Random access channel (PRACH)), etc. shared by the user terminals 20 are used. User data, higher layer control information, etc. are transmitted through PUSCH. Uplink control information (Uplink Control Information (UCI)) including at least one of acknowledgement information (ACK/NACK), radio quality information (CQI), and the like is transmitted on the PUSCH or PUCCH. The random access preamble for establishing a connection with the cell is transmitted through the PRACH.

< Base station >

Fig. 9 is a diagram showing an example of the overall configuration of the base station according to the present embodiment. The base station 10 includes a plurality of transmitting/receiving antennas 101, an amplifier unit 102, a transmitting/receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. The transmitting/receiving antenna 101, the amplifier unit 102, and the transmitting/receiving unit 103 may be configured to include one or more. The base station 10 may be a transmitting device for downlink data and a receiving device for uplink data.

The downlink data transmitted from the base station 10 to the user terminal 20 is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

The baseband signal processing section 104 performs, with respect to the downlink data, processing such as PDCP (packet data convergence protocol (PACKET DATA Convergence Protocol)) layer processing, segmentation and combination of user data, RLC (radio link control (Radio Link Control)) retransmission control and other RLC layer transmission processing, MAC (medium access control (Medium Access Control)) retransmission control (e.g., HARQ transmission processing), scheduling, transport format selection, channel coding, inverse fast fourier transform (INVERSE FAST Fourier Transform (IFFT)) processing, precoding processing and other transmission processing, and transfers the result to the transmission/reception section 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast fourier transform, and is transferred to the transmitting/receiving section 103.

Transmitting/receiving section 103 converts the baseband signal output from baseband signal processing section 104 by precoding for each antenna into a radio band and transmits the converted baseband signal. The radio frequency signal frequency-converted by the transmitting/receiving section 103 is amplified by the amplifier section 102, and transmitted from the transmitting/receiving antenna 101. The transmitting/receiving unit 103 may be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmitting/receiving unit 103 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit.

For the uplink signal, the radio frequency signal received by the transmitting-receiving antenna 101 is amplified by the amplifier unit 102. The transmitting/receiving section 103 receives the uplink signal amplified by the amplifier section 102. Transmitting/receiving section 103 frequency-converts the received signal to a baseband signal, and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing section 104 performs fast fourier transform (Fast Fourier Transform (FFT)) processing, inverse discrete fourier transform (INVERSE DISCRETE Fourier Transform (IDFT)) processing, error correction decoding, reception processing for MAC retransmission control, reception processing for RLC layer and PDCP layer on the user data included in the input uplink signal, and transfers the user data to the upper station apparatus 30 via the transmission path interface 106. Call processing section 105 performs call processing such as setting and release of a communication channel, state management of base station 10, and management of radio resources.

The transmission path interface 106 transmits and receives signals to and from the upper station apparatus 30 via a specific interface. The transmission path interface 106 may also transmit and receive signals (backhaul signaling) with other base stations 10 via inter-base station interfaces (e.g., optical fiber compliant with CPRI (common public radio interface (Common Public Radio Interface)), X2 interface).

The transmitting/receiving unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beam forming means may be constituted by an analog beam forming circuit (e.g., a phase shifter, a phase shift circuit) or an analog beam forming device (e.g., a phase shifter) described based on common knowledge in the technical field of the present invention. The transmitting/receiving antenna 101 can be constituted by an array antenna, for example. The transmitting/receiving unit 103 is configured to be able to apply single BF and multiple BF.

The transmitting/receiving unit 103 may transmit signals using a transmission beam or may receive signals using a reception beam. The transmitting/receiving section 103 may transmit and receive signals using the specific beam determined by the control section 301.

The transmitting/receiving unit 103 transmits downlink signals (e.g., downlink control signals (downlink control channels), downlink data signals (downlink data channels, downlink shared channels), downlink reference signals (DM-RS, CSI-RS, etc.), discovery signals, synchronization signals, broadcast signals, etc.). The transmitting/receiving unit 103 receives an uplink signal (for example, an uplink control signal (uplink control channel), an uplink data signal (uplink data channel, uplink shared channel), an uplink reference signal, and the like).

The transmitting/receiving unit 103 may transmit high-level parameters for setting the MCS table and the RNTI type.

The transmitting unit and the receiving unit of the present invention are configured by either or both of the transmitting/receiving unit 103 and the transmission path interface 106.

Fig. 10 is a diagram showing an example of the functional configuration of the base station according to the present embodiment. In the figure, functional blocks of the characteristic part in the present embodiment are mainly shown, and the base station 10 is provided with other functional blocks necessary for wireless communication. The baseband signal processing unit 104 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.

The control unit 301 performs control of the entire base station 10. The control unit 301 may be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.

The control unit 301 controls, for example, generation of a signal by the transmission signal generation unit 302 and allocation of a signal by the mapping unit 303. The control unit 301 controls the reception processing of the signal of the reception signal processing unit 304 and the measurement of the signal of the measurement unit 305.

The control unit 301 controls scheduling (e.g., resource allocation) of the downlink signal and the uplink signal. Specifically, control section 301 controls transmission signal generation section 302, mapping section 303, and transmission/reception section 103 so as to generate and transmit DCI (DL assignment, DL grant) including scheduling information of a downlink data channel and DCI (UL grant) including scheduling information of an uplink data channel.

Transmission signal generation section 302 generates a downlink signal (downlink control channel, downlink data channel, DM-RS, etc. downlink reference signal, etc.) based on the instruction from control section 301, and outputs the generated downlink signal to mapping section 303. The transmission signal generation unit 302 may be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present invention.

Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a specific radio resource based on the instruction from control section 301, and outputs the mapped downlink signal to transmitting/receiving section 103. The mapping unit 303 can be constituted by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field of the present invention.

The reception signal processing section 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the reception signal inputted from the transmission/reception section 103. For example, the received signal is an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 may be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present invention.

The reception signal processing unit 304 outputs information decoded by the reception processing to the control unit 301. For example, reception processing section 304 outputs at least one of a preamble, control information, and UL data to control section 301. In addition, the received signal processing unit 304 outputs the received signal and the signal after the reception processing to the measurement unit 305.

The measurement unit 305 performs measurements related to the received signals. The measurement unit 305 can be constituted by a measuring instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present invention.

The measurement unit 305 may also measure, for example, the received Power of a received signal (for example, reference signal received Power (REFERENCE SIGNAL RECEIVED Power (RSRP)), the received Quality (for example, reference signal received Quality (REFERENCE SIGNAL RECEIVED Quality (RSRQ)), the channel state, and the like. The measurement results may also be output to the control unit 301.

< User terminal >

Fig. 11 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmitting/receiving antennas 201, an amplifier unit 202, a transmitting/receiving unit 203, a baseband signal processing unit 204, and an application unit 205. The transmitting/receiving antenna 201, the amplifier unit 202, and the transmitting/receiving unit 203 may be configured to include one or more. The user terminal 20 may be a receiving device for downlink data or may be a transmitting device for uplink data.

The radio frequency signal received by the transmitting-receiving antenna 201 is amplified by the amplifier unit 202. The transmitting/receiving section 203 receives the downlink signal amplified by the amplifier section 202. Transmitting/receiving section 203 performs frequency conversion on the received signal to obtain a baseband signal, and outputs the baseband signal to baseband signal processing section 204. The transmitting/receiving unit 203 may be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmitting/receiving unit 203 may be configured as an integral transmitting/receiving unit, or may be configured by a transmitting unit and a receiving unit.

The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing for retransmission control, and the like on the input baseband signal. The downstream data is forwarded to the application unit 205. The application unit 205 performs processing related to a layer higher than the physical layer and the MAC layer, and the like. In the downstream data, the system information and the higher layer control information are also forwarded to the application unit 205.

The uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing section 204 performs transmission processing (for example, HARQ transmission processing), channel coding, precoding, discrete fourier transform (Discrete Fourier Transform (DFT)) processing, IFFT processing, and the like for retransmission control, and transfers the result to the transmission/reception section 203. The transmitting/receiving section 203 converts the baseband signal output from the baseband signal processing section 204 into a radio band and transmits the converted signal. The radio frequency signal frequency-converted by the transmitting/receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting/receiving antenna 201.

The transmitting/receiving unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beam forming means may be constituted by an analog beam forming circuit (e.g., a phase shifter, a phase shift circuit) or an analog beam forming device (e.g., a phase shifter) described based on common knowledge in the technical field of the present invention. The transmitting/receiving antenna 201 can be constituted by an array antenna, for example. The transmitting/receiving unit 203 is configured to be able to apply single BF and multiple BF.

The transmitting/receiving unit 203 may transmit signals using a transmission beam or may receive signals using a reception beam. The transmitting/receiving section 203 may transmit and receive signals using the specific beam determined by the control section 401.

The transmitting/receiving unit 203 receives downlink signals (e.g., downlink control signals (downlink control channels), downlink data signals (downlink data channels, downlink shared channels), downlink reference signals (DM-RS, CSI-RS, etc.), discovery signals, synchronization signals, broadcast signals, etc.). The transmitting/receiving unit 203 transmits uplink signals (e.g., uplink control signals (uplink control channels), uplink data signals (uplink data channels, uplink shared channels), uplink reference signals, etc.).

The transmitting/receiving section 203 may receive a higher layer parameter for setting the MCS table and the RNTI type.

Fig. 12 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. In the figure, functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be other functional blocks necessary for wireless communication also in the user terminal 20. The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a reception signal processing section 404, and a measurement section 405.

The control unit 401 performs control of the entire user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.

The control unit 401 controls, for example, generation of a signal in the transmission signal generation unit 402 and allocation of a signal in the mapping unit 403. The control unit 401 controls the reception process of the signal in the received signal processing unit 404 and the measurement of the signal in the measurement unit 405.

Control section 401 may control reception of a reference signal for measurement (for example, CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) when the reference signal and the downlink channel are set to the same time resource (symbol), based on whether or not downlink transmission using a specific MCS table (MCS table 3, for example, qam64 LowSE) can be set.

The control unit 401 may also control to select and receive the PDCCH if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example qam64 LowSE) can be set, in the case where the measurement reference signal (for example, CSI-RS or SSB) and the PDCCH are set to the same time resource (symbol).

The control unit 401 may also control to select and receive the PDSCH if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example qam64 LowSE) can be set, in the case where the reference signal for measurement (for example, CSI-RS or SSB) and the PDSCH are set to the same time resource (symbol).

The control unit 401 may also control to select and receive the aperiodic CSI-RS (a-CSI-RS) if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example qam to LowSE) can be set in the case where the aperiodic CSI-RS (a-CSI-RS) and the PDCCH are set to the same time resource (symbol). In this case, when the DCI that triggered the aperiodic CSI-RS (a-CSI-RS) is scrambled with a specific RNTI (new RNTI), control section 401 may determine that downlink transmission using a specific MCS table (MCS table 3, for example qam64 and LowSE) can be set.

Transmission signal generation section 402 generates an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) based on the instruction from control section 401, and outputs the generated uplink signal to mapping section 403. The transmission signal generation unit 402 may be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field of the present invention.

The transmission signal generation unit 402 generates an uplink data channel based on the instruction from the control unit 401. For example, when the UL grant is included in the downlink control channel notified from the base station 10, the transmission signal generation section 402 instructs the generation of the uplink data channel from the control section 401.

Mapping section 403 maps the uplink signal generated by transmission signal generating section 402 to radio resources based on the instruction from control section 401, and outputs the mapped uplink signal to transmitting/receiving section 203. The mapping unit 403 can be constituted by a mapper, a mapping circuit, or a mapping device described based on common knowledge in the technical field of the present invention.

The reception signal processing section 404 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the reception signal inputted from the transmission/reception section 203. For example, the received signal is a downlink signal (downlink control channel, downlink data channel, downlink reference signal, etc.) transmitted from the base station 10. The received signal processing unit 404 may be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present invention. The reception signal processing unit 404 can constitute a reception unit according to the present invention.

Reception signal processing section 404 performs blind decoding of a downlink control channel for scheduling transmission and reception of a downlink data channel based on an instruction from control section 401, and performs reception processing of the downlink data channel based on the DCI. The reception signal processing unit 404 estimates a channel gain based on the DM-RS or the CRS, and demodulates the downlink data channel based on the estimated channel gain.

The reception signal processing unit 404 outputs information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. The received signal processing unit 404 may also output the decoding result of the data to the control unit 401. The received signal processing unit 404 outputs the received signal and the received processed signal to the measurement unit 405.

The measurement unit 405 performs measurements related to the received signals. The measurement unit 405 may be constituted by a measuring device, a measurement circuit, or a measurement apparatus described based on common knowledge in the technical field of the present invention.

The measurement unit 405 may also measure, for example, the received power (e.g., RSRP), DL reception quality (e.g., RSRQ), channel status, etc. of the received signal. The measurement result may also be output to the control unit 401.

(Hardware construction)

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

Here, the functions include, but are not limited to, judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notifying), communication (communicating), forwarding (forwarding), configuration (reconfiguration), reconfiguration (reconfiguring), allocation (locating, mapping), and assignment (nesigasing). For example, a functional block (constituent unit) that functions transmission may be referred to as a transmission unit (TRANSMITTING UNIT), a transmitter (transmitter), or the like. As described above, the implementation method is not particularly limited.

For example, a base station, a user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 13 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 described above may be configured as a computer device physically including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In this disclosure, statements of apparatuses, circuits, devices, sections, units, 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 to not include a part of the devices.

For example, the processor 1001 is illustrated as only one, but there may be multiple processors. The processing may be performed by 1 processor, or the processing may be performed by 1 or more processors simultaneously, sequentially, or using other methods. The processor 1001 may be mounted by 1 or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as a processor 1001 and a memory 1002, and the processor 1001 performs 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 memory 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be configured by a central processing unit (Central Processing Unit (CPU)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the baseband signal processing unit 104 (204), the call processing unit 105, and the like described above may also be implemented by the processor 1001.

The processor 1001 reads a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be implemented for other functional blocks.

The Memory 1002 is a computer-readable recording medium, and may be constituted by at least one of ROM (Read Only Memory), EPROM (erasable programmable ROM (Erasable Programmable ROM)), EEPROM (electric EPROM (Electrically EPROM)), RAM (random access Memory (Random Access Memory)), and other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable to implement a wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be constituted of at least one of a flexible magnetic disk, a soft (registered trademark) disk, an optical magnetic disk (e.g., a compact disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick (stick), a key drive)), a magnetic stripe, a database, a server, and other suitable storage medium, for example. The storage 1003 may also be referred to as secondary storage.

The communication device 1004 is hardware (transmitting/receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like, for example. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplexing (Frequency Division Duplex (FDD)) and time division duplexing (Time Division Duplex (TDD)), for example. For example, the transmission/reception antenna 101 (201), the amplifier unit 102 (202), the transmission/reception unit 103 (203), the transmission path interface 106, and the like described above may be implemented by the communication device 1004. The transmitting/receiving unit 103 (203) may be mounted by physical separation or logical separation between the transmitting unit 103a (203 a) and the receiving unit 103b (203 b).

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

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 a different bus for each device.

The base station 10 and the user terminal 20 may be configured by hardware including a microprocessor, a digital signal processor (DIGITAL SIGNAL Processor (DSP)), an ASIC (Application SPECIFIC INTEGRATED Circuit), a PLD (programmable logic device (Programmable Logic Device)), an FPGA (field programmable gate array (Field Programmable GATE ARRAY)), or some or all of the functional blocks may be implemented by using the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

(Modification)

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 also be interchanged. The signal may also be a message. The reference signal can also be referred to simply as RS (Reference Signal), and may also be referred to as Pilot (Pilot), pilot signal, etc., depending on the standard applied. In addition, the component carrier (Component Carrier (CC)) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

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

The parameter set Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. For example, at least one of a subcarrier spacing (SubCarrier Spacing (SCS)), a bandwidth, a symbol length, a cyclic prefix length, a Transmission time interval (Transmission TIME INTERVAL (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in a frequency domain, a specific windowing (windowing) process performed by a transceiver in a time domain, and the like may be expressed.

A slot may also be formed in the time domain from one or more symbols, such as orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, single carrier frequency division multiple access (SINGLE CARRIER Frequency Division Multiple Access (SC-FDMA)) symbols, and so on. A time slot may also be a time unit based on a parameter set.

The time slot may also contain a plurality of mini-slots. Each mini-slot may also be formed of one or more symbols in the time domain. In addition, the mini-slot may also be referred to as a sub-slot. Mini-slots may also be made up of a fewer number of symbols than slots. PDSCH (or PUSCH) transmitted in a larger time unit than the 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 units of time when a signal is transmitted. Radio frames, subframes, slots, mini-slots, and symbols may also use their corresponding designations.

For example, 1 subframe may also be referred to as a Transmission TIME INTERVAL (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 the TTI may be a subframe (1 ms) in the conventional LTE, a period (e.g., 1-13 symbols) shorter than 1ms, or a period longer than 1 ms. The unit representing the TTI may also be referred to as a slot, a mini-slot, etc., and is not referred to as a subframe.

Here, TTI refers to, for example, a scheduled minimum time unit in wireless communication. For example, in the LTE system, a base station performs scheduling for each user terminal to allocate radio resources (a usable bandwidth, transmission power, and the like in each user terminal) in TTI units. The definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a data packet (transport block), a code block, a codeword, or the like after channel coding, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (e.g., number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may also be shorter than the TTI.

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

A TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE rel.8-12), a normal TTI, a long TTI, a normal subframe, a long subframe, a time slot, etc. A TTI that is shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

A long TTI (e.g., a normal TTI, a subframe, etc.) may also be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may also be replaced with a TTI having a TTI length less than the long TTI and a TTI length of 1ms or more.

A Resource Block (RB) is a Resource allocation unit of the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers (subcarriers) in the frequency domain.

The Resource Block (RB) may also contain one or more symbols in the time domain, and may be 1 slot, 1 mini slot, 1 subframe, or 1 TTI in length. 1 TTI and 1 subframe may each be formed of one or more resource blocks.

One or more Resource Blocks (RBs) may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), resource element groups (Resource Element Group (REGs)), PRB pairs, RB peers.

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

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

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

The names used for parameters and the like in this disclosure are not limiting names at any point. Furthermore, the expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. The various channels, e.g., physical uplink control channel (Physical Uplink Control Channel (PUCCH)), physical downlink control channel (Physical Downlink Control Channel (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 limiting names at any point.

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

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

The input/output information, signals, and the like may be stored in a specific location (for example, a memory), or may be managed using a management table. Information, signals, etc. inputted and outputted can be overwritten, updated, or recorded. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The notification of information is not limited to the manner/embodiment described in the present disclosure, and may be performed using other methods. For example, the notification of information may also be implemented by physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)))), uplink control information (Uplink Control Information (UCI))), higher layer signaling (e.g., radio resource control (Radio Resource Control (RRC)) signaling, broadcast information (master information block (Master Information Block (MIB)), system information block (System Information Block (SIB)) and the like), MAC (medium access control (Medium Access Control)) signaling), other signals, or a combination thereof.

Physical Layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may also be referred to as an RRC message, such as an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration)) message, or the like. The MAC signaling may be notified using, for example, a MAC Control Element (MAC CE).

The notification of the specific information (for example, the notification of "X") is not limited to the explicit notification, and may be performed implicitly (for example, by not notifying the specific information or by notifying other information).

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

Whether software is referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects (objects), executable files, threads of execution, procedures, functions, and the like.

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

The term "system" and "network" as used in this disclosure can be used interchangeably.

In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi Co-Location (QCL)", "TCI state (transmission setting instruction state (Transmission Configuration Indication state))", "spatial relationship", "spatial domain filter (spatial domain filter)", "transmit power", "phase rotation", "antenna port group", "layer", "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)", "radio Base Station", "fixed Station", "NodeB", "eNodeB (eNB)", "gndeb (gNB)", "access point", "transmission point (transmission point)", "reception point (reception point)", "transmission/reception point", "cell", "sector", "cell group", "carrier", "component carrier", "Bandwidth Part (BWP)", and the like can be used interchangeably. Base stations are also sometimes referred to by the terms macrocell, microcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells (also referred to as sectors). In the case of a base station accommodating multiple cells, the coverage area of the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (remote radio head (Remote Radio Head (RRH))), "cell" or "sector" terms refer to a portion or the entirety of the coverage area of at least one of the base station and the base station subsystem that is in communication service in that coverage area.

In the present disclosure, terms of "Mobile Station (MS)", "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, 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 communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., an unmanned plane, an automated guided vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station further includes a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (internet of things (Internet of Things)) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a user terminal. For example, the 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 (for example, may also be referred to as D2D (Device-to-Device)), V2X (Vehicle-to-evaluation), or the like. In this case, the user terminal 20 may have the functions of the base station 10 described above. The language of "uplink", "downlink", etc. may be replaced with a language (e.g., "side") corresponding to the communication between terminals. For example, the uplink channel, the downlink channel, etc. may be replaced with a 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 an operation performed by a base station is sometimes performed by an upper node (upper node) thereof according to circumstances. In a network comprising one or more network nodes (network nodes) with base stations, the various operations performed for communication with the terminal can obviously be performed by the base station, one or more network nodes other than the base station (e.g. considering MME (Mobility management entity) MANAGEMENT ENTITY), S-GW (Serving-Gateway), etc., but not limited thereto, or a combination thereof.

The embodiments described in the present disclosure may be used alone, in combination, or switched with execution. The processing procedures, timings, flowcharts, and the like of the embodiments and/or the embodiments described in the present disclosure may be changed in order as long as there is no contradiction. For example, elements of various steps are presented using an illustrated order for the methods described in this disclosure, and are not limited to the particular order presented.

The modes/embodiments described in the present disclosure can also be applied to LTE (long term evolution (Long Term Evolution)), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (fourth generation mobile communication system (4 th generation mobile communication system)), 5G (fifth generation mobile communication system (5 th generation mobile communication system)), FRA (future Radio access (Future Radio Access)), new-RAT (Radio access technology (Radio Access Technology)), NR (New Radio), NX (New Radio access), FX (future generation Radio access (Future generation Radio access)), GSM (registered trademark) (global system for mobile communication (Global System for Mobile communications)), CDMA2000, UMB (Ultra mobile broadband (Ultra Mobile Broadband)), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand)), bluetooth (registered trademark), systems that utilize other wireless communication methods, systems that expand based on them, and the like. In addition, a plurality of systems (for example, LTE or a combination of LTE-a and 5G) may be applied in combination.

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

Any reference to elements using references to "first," "second," etc. in this disclosure is not intended to entirely limit the amount or order of such elements. These designations can be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that in some form the first element must precede the second element.

The term "determining" as used in the present disclosure sometimes encompasses a wide variety of operations. For example, "determining (determining)" may be regarded as "determining (determining)" for a decision (judging), a calculation (computing), a processing (processing), a derivation (deriving), a investigation (INVESTIGATING), a search (looking up, search, inquiry) (e.g., a search in a table, a database, or another data structure), a confirmation (ASCERTAINING), or the like.

"Determination" may also be regarded as "determining" a reception (e.g., receiving information), a transmission (e.g., transmitting information), an input (input), an output (output), an access (accessing) (e.g., accessing data in a memory), and the like.

"Judgment (decision)" may also be regarded as "judgment (decision)" for resolution (resolving), selection (selecting), selection (choosing), establishment (establishing), comparison (comparing), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" for some operations.

The "judgment (decision)" may be replaced with "assumption (assuming)", "assumption (assuming)", "expectation (expecting)", "consider (considering)", or the like.

The "maximum transmission power" described in the present disclosure may mean the maximum value of transmission power, may mean the nominal maximum transmission power (the nominal UE maximum transmit power), or may mean the rated maximum transmission power (the rated UE maximum transmit power).

As used in this disclosure, the terms "connected", "coupled", or any variation thereof, mean any connection or coupling, either direct or indirect, between 2 or more elements, and can include 1 or more intervening elements between two elements that are "connected" or "coupled" to each other. The combination or connection of the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced by "connected".

In the present disclosure, when two elements are connected, it is possible to consider that two elements are "connected" or "combined" with each other using one or more wires, cables, printed electrical connections, or the like, and electromagnetic energy having wavelengths in the wireless frequency domain, the microwave domain, the optical (both visible and invisible) domain, or the like, as some non-limiting and non-inclusive (non-inclusive) examples.

In the present disclosure, the term "a is different from B" may also mean that "a is different from B". The terms "separated," "joined," and the like may also be construed as well.

In the case where "include", and variations thereof are used in the present disclosure, these terms are meant to be inclusive as well as the term "comprising". Further, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, for example, in a case where an article is added by translation such as a, an, and the in english, the present disclosure may also include a case where a noun following the article is plural.

While the invention according to the present disclosure has been described in detail, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and variation without departing from the spirit and scope of the invention determined based on the description of the claims. Accordingly, the description of the present disclosure is intended to be illustrative, and is not intended to be limiting of the invention in any way.

Claims (5)

1. A terminal, characterized by comprising:

a control unit that controls to report an ability related to simultaneous reception of a plurality of downlink signals using different beams; and

And a reception unit configured to simultaneously receive a measurement reference signal to which a first beam is applied and a downlink channel to which a second beam different from the first beam is applied, when the measurement reference signal and the downlink channel are set to the same time resource.

2. The terminal of claim 1, wherein the terminal comprises a base station,

The first beam and the second beam are each not a quasi co-located QCL type relationship of spatial reception parameters.

3. The terminal of claim 2, wherein the terminal comprises a base station,

The QCL type is QCL type D.

4. A wireless communication method, comprising:

a step of controlling to report an ability related to simultaneous reception of a plurality of downlink signals using different beams; and

And a step of receiving the reference signal for measurement and the downlink channel simultaneously when the reference signal for measurement to which the first beam is applied and the downlink channel to which the second beam different from the first beam is applied are set to the same time resource.

5. A system having a terminal and a base station, wherein,

The terminal has:

a control unit that controls to report an ability related to simultaneous reception of a plurality of downlink signals using different beams; and

A reception unit configured to simultaneously receive a reference signal for measurement to which a first beam is applied and a downlink channel to which a second beam different from the first beam is applied, when the reference signal for measurement and the downlink channel are set to the same time resource,

The base station has:

and a transmitting unit configured to transmit the reference signal for measurement and the downlink channel.