CN112586054A - User terminal and wireless communication method - Google Patents

Abstract

In a future wireless communication system, in particular, when URLLC is set, in order to appropriately control a reception operation in a user terminal when downlink channel reception is set by a symbol in which a measurement reference signal is set, one embodiment of the user terminal of the present invention includes: a receiving unit configured to receive 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), a User terminal (User Equipment (UE)) measures a channel state using a specific reference signal or a resource for the reference signal. The Reference Signal for Channel State measurement may also be referred to as a CSI-RS (Channel State Information Reference Signal) or the like (non-patent document 1).

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.213V13.10.0"Technical Specification Group Radio Access Network; improved Universal Radio Access (E-UTRA); physical layer procedures (Release) 13', 6 months in 2018

Disclosure of Invention

Problems to be solved by the invention

In a future wireless communication system (for example, New Radio (NR)), examples of further advanced Mobile Broadband (enhanced Mobile Broadband (eMBB)), Machine-Type communication (massive Machine Type Communications (mtc)) that realizes a plurality of simultaneous connections, high-reliability and Low-delay Communications (URLLC)), and the like are assumed.

In the current specification, the user terminal does not assume (unexpected) that transmission/reception of a Physical resource (for example, a Physical Downlink Control Channel (PDCCH)) or a Physical Downlink Shared Channel (PDSCH)) is set by a symbol to which a measurement reference Signal (for example, CSI-RS or Synchronization Signal Block (SSB)) is set. That is, simultaneous reception of a measurement reference signal (for example, CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) has not been sufficiently studied.

The present invention has been made in view of the above, and an object thereof 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 in which a measurement reference signal (for example, CSI-RS or SSB) is set, in a future radio communication system, particularly, with attention paid to a case where URLLC is set.

Means for solving the problems

One embodiment of a user terminal according to the present invention is characterized by comprising: a receiving unit configured to receive 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, particularly when URLLC is set, it is possible to appropriately control a reception operation when reception of a downlink channel (PDCCH or PDSCH) is set by a symbol to which a measurement reference signal (for example, CSI-RS or SSB) is set.

Drawings

Fig. 1A and 1B are diagrams showing examples 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 the structure of the MCS table to be applied to the user terminal.

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

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

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

Fig. 7A and 7B are diagrams illustrating an example of a scheme assumed 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 a wireless communication system according to the present embodiment.

Fig. 9 is a diagram showing an example of a 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 hardware configurations of a radio base station and a user terminal according to an embodiment of the present invention.

Detailed Description

(QCL/TCI)

In a future Radio communication system (for example, New Radio (NR)), communication using Beam Forming (BF) is being studied, and therefore, it is being studied that a user terminal controls Transmission/reception processing of a channel based on a state (TCI state) of a Transmission Configuration Indicator (TCI) of the channel.

The TCI state refers to information related to Quasi-Co-location (qcl) of a channel or a signal, and is also referred to as spatial reception parameter(s), spatial information (spatial info), and the like. For each channel or each signal, a TCI status is assigned to the user terminal. The user terminal may decide at least one of a transmission beam (Tx beam) and a reception beam (Rx beam) of each channel based on the TCI state specified for each channel.

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

The spatial reception parameters may also correspond to reception beams (Rx beams) (e.g., reception analog beams) of the user terminal, and the beams may also be determined based on the spatial QCL. QCL and at least one element of QCL in the present disclosure may be replaced by sQCL (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 that doppler shift, doppler dispersion, average delay, and delay spread are the same.

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

QCL type C is a QCL that can assume that the average delay and doppler shift are the same.

QCL type D is a QCL that can assume the spatial reception parameters to be the same.

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

information indicating the above-mentioned QCL type (QCL type information)

Information (RS information) on a Reference Signal (RS) having a QCL relationship with each channel

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

Information indicating the bandwidth Part (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-location (QCL) relationship between different signals (e.g. QCL type D), reception with the same beam is envisaged.

(URLLC)

In future wireless communication systems (for example, NR), examples of further advanced Mobile Broadband (enhanced Mobile Broadband (eMBB)), Machine-Type communication (large Machine Type communication (mtc)) that realizes multiple simultaneous connections, high-reliability and Low-Latency communication (URLLC)), and the like are assumed. For example, URLLC requires higher delay reduction than eMBB and higher reliability than eMBB.

As described above, 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 with different requirements.

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

When a new MCS table is introduced, it is considered to use a specific RNTI (Radio Network Temporary Identifier) (which may also be referred to as new RNTI or MCS RNTI) in order to specify the new MCS table. An example of an MCS table and an RNTI that are 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 a modulation scheme (or modulation order) and a coding rate (modulation order/coding rate) of a physical shared channel scheduled by 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 the MCS field included in the DCI (e.g., DCI format 1_0 and DCI format 1_1) of the scheduling Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)).

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

Each modulation order is a value corresponding to each modulation scheme. For example, the number of modulations of QPSK (Quadrature Phase Shift Keying) corresponds to 2, 16QAM (Quadrature Amplitude Modulation) corresponding 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 the MCS table. The values of the MCS table shown in fig. 1 are merely exemplary, and are not limited thereto. In addition, the MCS index (I) can be omitted_MCS) Some items (for example, spectral efficiency) to be associated may be added with other items.

In fig. 1A, QPSK, 16QAM, and 64QAM are specified as the number of modulations. In fig. 1B, QPSK, 16QAM, 64QAM, and 256QAM are specified as the number of modulations. 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, 256QAM table, or QAM256 for PDSCH. A 64QAM table and a 256QAM table as shown in fig. 1 are also specified in the existing LTE system.

In future wireless communication systems (e.g., NR), cases are envisaged that require lower latency and higher reliability than existing LTE systems (e.g., URLLC). In order to cope with such a situation, 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 exemplary, and are not limited thereto. In fig. 2, QPSK, 16QAM, and 64QAM are specified as the number of modulations, and the coding rate (MCS index 0) defined as the minimum is 30(× 1024). The MCS table of fig. 2 may be referred to as MCS table 3 for PDSCH, new MCS table, or qam64 LowSE.

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

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

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

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

(3) RNTI TYPE APPLIED TO CYCLIC REDUCTION CHECK (CRC) CRANKING 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., qam256) and MCS table 3 (e.g., qam64 LowSE). Alternatively, the MCS table information may be information specifying one of MCS table 2 (e.g., qam256) and MCS table 3 (e.g., qam64 LowSE).

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

When a new MCS table (MCS table 3, for example, qam64LowSE) is set, the user terminal may determine an MCS table to be applied based on the type of search space used for transmitting DCI.

Fig. 3 is a diagram showing an example of the structure of the MCS table to be applied to the 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) signaling), and means an RNTI table set by one of MCS table 1(qam64), MCS table 2(qam256), and MCS table 3(qam64LowSE), "RRC-configured" means an RNTI category set by a higher layer (e.g., RRC signaling), "C" means a C-RNTI, "new" means a new RNTI, "RNTI scrambling DCI (DCI scrambling DCI), and" C "means a new RNTI scrambling DCI format (DCI scrambling DCI) means that CRC of the scrambled DCI is applied to the RNTI category," C "means a C-RNTI," new "means a new RNTI format means a new DCI format (DCI format)" means DCI transmitted in a Search space, "1 _ 0" means DCI format 1_0, "RNTI 1_ 1" means a DCI format "Search space (Search space), "Common" means a Common search space and "UE" means a UE-specific search space. "Used MCS table (Used MCS table)" indicates an MCS table to be applied, and refers to one of MCS table 1(qam64), MCS table 2(qam256) and MCS table 3(qam64 LowSE). The same applies to fig. 4, 5, or 6.

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

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

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, e.g., qam64LowSE) in the case that MCS table 2 (e.g., qam256) 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 is scrambled by new RNTI, and DCI (DCI format 1_0 or DCI format 1_1) is transmitted through a common search space or UE-specific search space. In this case, the user terminal receives the PDSCH using the new MCS table (MCS table 3, e.g., qam64 LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, e.g., qam64LowSE) in the case where MCS table 3 (e.g., qam64LowSE) is set by a higher layer (e.g., RRC signaling), C-RNTI or a new RNTI is set by a higher layer (e.g., RRC signaling), the CRC of DCI is scrambled by a new RNTI, and DCI (DCI format 1_0 or DCI format 1_1) is transmitted through a common search space or UE-specific search space. In this case, the user terminal receives the PDSCH using the new MCS table (MCS table 3, e.g., qam64 LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, e.g., qam64LowSE) in the case where MCS table 3 (e.g., qam64LowSE) 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 is scrambled by C-RNTI, and DCI (DCI format 1_0) is transmitted through the UE-specific search space. In this case, the user terminal receives the PDSCH using the new MCS table (MCS table 3, e.g., qam64 LowSE).

As shown in fig. 3, the user terminal applies a new MCS table (MCS table 3, e.g., qam64LowSE) in the case where MCS table 3 (e.g., qam64LowSE) 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 is scrambled by C-RNTI, and DCI (DCI format 1_1) is transmitted through a common search space or UE-specific search space. In this case, the user terminal receives the PDSCH using the new MCS table (MCS table 3, e.g., qam64 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 qam64LowSE) may be notified to a PDSCH transmitted by Semi-Persistent Scheduling (DL-SPS) by a higher layer parameter (for example, MCS-Table). The new MCS table for DL-SPS may be set independently of PDSCH transmission based on DCI (DL scheduling based on grant).

Thus, in a future wireless communication system (for example, NR), various use cases (for example, URLLC) having different requirements are assumed, and a new MCS table in which a lower coding rate is specified is supported.

In the present specification, it is also conceivable that at least one of Downlink (DL) transmission and Uplink (UL) transmission to which the new MCS table (MCS table 3, for example, qam64LowSE) is applied is URLLC.

In future wireless communication systems (for example, NR), in addition to measurement using CSI-RS, measurement using a Synchronization Signal Block (SSB) is performed.

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 (PSS) and a Secondary Synchronization Signal (SSS), for example.

In the current specification, the user terminal does not assume (is not expected to set) transmission/reception of physical resources (for example, PDCCH, PDSCH, PUCCH, PUSCH) by a symbol to which a measurement reference signal (for example, CSI-RS or SSB) is set. That is, it is not considered that the reference signal for measurement (for example, CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) are simultaneously received.

The simultaneous reception of the measurement reference signal (for example, CSI-RS or SSB) and the downlink channel (PDCCH or PDSCH) means that the user terminal receives the measurement reference signal and the downlink channel at least partially overlapping in time resources (for example, symbols).

When an analog beam is used for signal transmission, particularly in the second Frequency band (Frequency Range 2(FR2)), the measurement reference signal (for example, CSI-RS or SSB) and the downlink channel are set to beams other than QCL type D (TCI state) by the same symbol, and the user terminal cannot simultaneously receive the measurement reference signal and the downlink channel when it can form only one reception beam. In this case, it becomes a problem which of the measurement reference signal and the downlink channel the user terminal receives.

Therefore, the present inventors have specifically studied the operation of a user terminal in a case where reception of a downlink channel (PDCCH or PDSCH) is set by a symbol to which a measurement reference signal (for example, CSI-RS or SSB) is set, that is, in a case where the measurement reference signal 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.

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

(first mode)

In the first aspect, 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 each a specific quasi-co-location (for example, QCL type D) will be described.

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 QCL type D, the user terminal may preferentially receive the downlink channel (PDCCH or PDSCH) for URLLC, and otherwise receive the measurement reference signal (for example, CSI-RS or SSB) and measure the channel state.

First, an operation of the user terminal in the case where a reference signal for measurement (for example, 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 URLLC can be set and the case other than the case.

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, when the C-RNTI or the new RNTI is set by a higher layer (for example, RRC signaling) as shown in fig. 4 by diagonal line enhancement, the user terminal determines that there is a possibility of applying a new MCS table (MCS table 3, for example, qam64LowSE) (part (1) or part (2) in fig. 4), that is, that URLLC can be set.

Alternatively, as shown in fig. 4, when the MCS table 3 (for example, qam64LowSE) is set by a higher layer (for example, RRC signaling), the user terminal determines that there is a possibility of applying a new MCS table (MCS table 3, for example, qam64LowSE) ((3) in fig. 4), that is, it is set that URLLC can be set.

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

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

Fig. 5 is a diagram showing an example of conditions under which URLLC can be set. Since the user terminal already detects pdcch (DCI), as shown in fig. 5 by diagonal enhancement, 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 the common search space or UE-specific search space, it is determined that a new MCS table (MCS table 3, e.g., qam64LowSE) is applied ((1) or (2) in fig. 5), that is, URL is set.

Alternatively, as shown in fig. 5, when MCS table 3 (for example, qam64LowSE) is set by a higher layer (for example, RRC signaling), C-RNTI or new RNTI is set by a higher layer (for example, RRC signaling), CRC of DCI scheduled for PDSCH is scrambled by the new RNTI, and 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 a new MCS table (MCS table 3, for example, qam64LowSE) is applied ((3) in fig. 5), that is, URLLC is set.

Alternatively, as shown in fig. 5, the user terminal sets MCS table 3 (e.g., qam64LowSE) by a higher layer (e.g., RRC signaling), sets C-RNTI by a higher layer (e.g., RRC signaling), scrambles CRC of DCI scheduled for PDSCH by C-RNTI, and determines that a new MCS table (MCS table 3, e.g., qam64LowSE) is applied (fig. 5, (4)), that is, URL is set when DCI (DCI format 1_0) is transmitted through the UE-specific search space.

Alternatively, as shown in fig. 5, when MCS table 3 (for example, qam64LowSE) is set by a higher layer (for example, RRC signaling), C-RNTI is set by a higher layer (for example, RRC signaling), CRC of DCI scheduling PDSCH is scrambled by C-RNTI, and 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, for example, qam64LowSE) is applied ((5) in fig. 5), that is, URLLC is set.

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

According to the first 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 each a specific quasi-co-location (for example, QCL type D), since the user terminal other than the URLLC (the URLLC is not set) can preferentially receive the measurement reference signal (for example, CSI-RS or SSB) and perform beam control and channel quality measurement, it is possible to improve the communication quality. Since a user terminal to which URLLC can be set can preferentially receive a downlink channel (PDCCH or PDSCH) for URLLC, it is possible to reduce delay.

(second mode)

In the second mode, an operation of a user terminal in a case where an Aperiodic CSI-RS (Aperiodic CSI-RS, a-CSI-RS) and a 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) will be described.

The aperiodic CSI-RS (a-CSI-RS) is set to mean that a CSI request (trigger) is dynamically made from the base station. For the user terminal to which URLLC is set, it is assumed that the priority of the aperiodic CSI-RS (a-CSI-RS) is higher than the priority of the measurement reference signal (for example, CSI-RS or SSB) described in the first embodiment.

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

Fig. 6 is a diagram showing an example of conditions under which URLLC can be set. Since the user terminal has not received the PDCCH, when the C-RNTI or the new RNTI is set by a higher layer (for example, RRC signaling) as shown in fig. 6 by diagonal line enhancement, the user terminal determines that there is a possibility that the new MCS table (MCS table 3, for example, qam64LowSE) is applied ((1) or (2) in fig. 6), that is, URLLC can be set.

Alternatively, as shown in fig. 6 by the diagonal line, when the MCS table 3 (for example, qam64LowSE) is set by a higher layer (for example, RRC signaling), the user terminal determines that there is a possibility that a new MCS table (MCS table 3, for example, qam64LowSE) is applied ((3) in fig. 6), that is, URLLC can be set.

In the case where the URLLC is set to be settable, the user terminal may preferentially receive the PDCCH without receiving the aperiodic CSI-RS (a-CSI-RS).

However, as shown in fig. 6 by the thin diagonal lines, when the CRC of the DCI triggering the aperiodic CSI-RS (a-CSI-RS) is scrambled by the new RNTI, the user terminal determines that the new MCS table (MCS table 3, for example, qam64LowSE) is applied ((1) or (2) in fig. 6), that is, URLLC is set.

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

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

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

Since the user terminal already detects pdcch (DCI), as shown in fig. 5 by diagonal enhancement, C-RNTI or a new RNTI is set by a higher layer (for example, 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 a UE-specific search space, it is determined that a new MCS table (MCS table 3, for example, qam64LowSE) is applied ((1) or (2) in fig. 5), that is, URLLC is set.

Alternatively, as highlighted by diagonal lines in fig. 5, when MCS table 3 (e.g., qam64LowSE) is set by a higher layer (e.g., RRC signaling), C-RNTI or a new RNTI is set by a higher layer (e.g., RRC signaling), CRC of DCI scheduled for PDSCH is scrambled by a 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, the user terminal determines that a new MCS table (e.g., qam64LowSE) is applied ((3) in fig. 5), that is, URLLC is set.

Alternatively, as highlighted by diagonal lines in fig. 5, when MCS table 3 (e.g., qam64LowSE) 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 DCI (DCI format 1_0) is transmitted through the UE-specific search space, the user terminal determines that a new MCS table (MCS table 3, e.g., qam64LowSE) is applied ((4) in fig. 5), that is, URLLC is set.

Alternatively, as highlighted by diagonal lines in fig. 5, MCS table 3 (e.g., qam64LowSE) 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 the common search space or UE-specific search space, the user terminal determines that a new MCS table (MCS table 3, e.g., qam64LowSE) is applied ((5) in fig. 5), that is, URLLC is set.

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

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

In other cases (in case of URLLC not being set), the user terminal may also receive aperiodic CSI-RS (a-CSI-RS) and measure the channel state without receiving 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 are not each a specific quasi-co-location (e.g., QCL type D), the user terminal other than the URLLC (without the URLLC set) preferentially receives the aperiodic CSI-RS (a-CSI-RS) and can perform beam control and channel quality measurement, and therefore, the communication quality can be improved. Since a user terminal to which URLLC can be set can preferentially receive a downlink channel (PDCCH or PDSCH) for URLLC, it is possible to reduce delay. The user terminal with the URLLC configured can preferentially receive the aperiodic CSI-RS (A-CSI-RS), and the response to the aperiodic CSI request is prioritized to the reception of the downlink channel.

(third mode)

In the third scheme, the UE may also report to the network whether multiple beams can be received simultaneously through UE capability information (UE capability). A user terminal reporting the capability of receiving multiple beams simultaneously may also assume that a reference signal for measurement (e.g., CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) are received 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 the same operation as a user terminal that reports that it is not possible to receive multiple beams simultaneously.

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

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

Digital beams are a method of pre-coding signal processing (on digital signals) at baseband. In this case, parallel processing of Inverse Fast Fourier Transform (IFFT), Digital-to-Analog Converter (DAC), or RF (Radio Frequency) requires 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 scheme, the UE may also report to the network whether URLLC is supported or not through UE capability information (UE capability). The operation of the user terminal described in the first or second mode may also be limited to be applied to a terminal reported by 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 settable combination of RNTIs. If the new RNTI is included in the reported combination of RNTIs, the user terminal can also assume support of URLLC.

The user terminal may report a combination of settable MCS tables. The user terminal may also assume support of URLLC in case a new MCS table (MCS table 3, e.g. qam64LowSE) is included in the reported combination of 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 each a specific quasi-co-site (for example, QCL type D), and the user terminal cannot simultaneously receive the measurement reference signal and the downlink channel, the priority of reception may be changed according to the use of the measurement reference signal.

It may be configured to change the priority depending on what kind of signal the measurement reference signal (for example, CSI-RS or SSB) is used for. Examples of the application include Radio Resource Management (RRM) (Layer 3 measurement (Layer 3 (L3)), Radio Link monitoring (Radio Link Monitor (RLM)), Beam Failure Detection (BFD)), Beam Management (BM)) (Layer1 Reference Signal Received Power measurement (Layer1 (L1)) measurement (Layer1 Signal Received Power (RSRP) measurement) (Layer1 Reference Signal Received Quality measurement (L1 Reference Signal Received Quality (RSRQ)) measurement (Signal to Interference plus Noise Ratio (CSI)), CSI measurement, and the like.

For example, the reference signal for Radio Resource Management (RRM) may be a reference signal for reception Beam Management (BM) or Radio Link Monitoring (RLM) with priority lower than CSI-RS even if it is a Synchronization Signal Block (SSB). This enables appropriate beam management in wireless communication, and thus can suppress deterioration in 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 use of the reference signal. For example, the user terminal may be configured to receive a reference signal for a high priority application, and not receive any other reference signal in the same symbol as the symbol in which the reference signal is set or symbols before and after the symbol.

Thus, an operation more important for communication can be preferentially performed, and thus degradation of communication quality can be suppressed.

The usage of the reference signal may be set in order from high to low in priority, for example, as 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 the user terminal is used for the purpose of priority 1 or higher, and may prioritize a downlink channel (PDCCH or PDSCH) other than the reference signal.

The user terminal may prioritize the reference signal if it is for use of priority 1 or higher, and may prioritize the PDCCH.

The user terminal may prioritize the reference signal if the user terminal is used for the purpose of priority 3 or higher, and may prioritize the PDSCH other than the reference signal.

This is because it is conceivable that Beam Management (BM) with a high priority is required to prevent beam failure or link failure, and on the other hand, the characteristics do not deteriorate immediately even if CSI measurement or Radio Resource Management (RRM) is not received.

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

Thus, the user terminal can preferentially receive the reference signal in the cell having the higher priority in communication, and therefore, the more important degradation of the quality of communication can be suppressed.

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

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

In the case of considering the cell index, the smallest CC index (the lowest CC index) or the largest CC index (the largest CC index) may be prioritized.

When the frequency band of the cell is considered, the first frequency band (FR1) may be prioritized over the second frequency band (FR2) (FR1 > FR2), and the second frequency band (FR2) may be prioritized over the first frequency band (FR1) (FR2 > FR 1).

The first frequency band (FR1) may be, for example, a frequency band below 6GHz (sub-6 GHz). The second frequency band (FR2) may be a frequency band higher than 24GHz (above-24 GHz). The first frequency band (FR1) may also be defined as a frequency range using at least one of 15, 30, and 60kHz as a Sub-Carrier Spacing (SCS). The second frequency band (FR2) 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 (FR1) and the second frequency band (FR2) are not limited to these. For example, the first frequency band (FR1) may be a higher frequency band than the second frequency band (FR 2). The second frequency band (FR2) may also be used only for the Time Division Duplex (TDD) band. It is preferable to synchronously use the second frequency band (FR2) among a plurality of base stations. When a plurality of carriers are included in the second frequency band (FR2), it is preferable that these carriers are operated in synchronization.

(Wireless communication System)

The configuration of the radio 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 a wireless communication system according to the present embodiment. In the wireless communication system 1, Carrier Aggregation (CA) or Dual Connectivity (DC) can be applied in which a plurality of basic frequency blocks (Component carriers, Component Carriers (CC)) are integrated into one unit, each of which has a system bandwidth (e.g., 20MHz) of the LTE system as 1 unit. 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), NR (New Radio)), and the like.

The wireless communication system 1 may also support dual connectivity (Multi-RAT DC (MR-DC)) between multiple RATs (radio access technologies). The MR-DC may include dual connection of LTE and NR (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, dual connection of NR and LTE (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 wireless communication system 1 includes a base station 11 forming a macrocell C1, and base stations 12a to 12C arranged within a macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 is arranged in the macro cell C1 and each small cell C2. It may also be configured to apply different parameter sets (Numerology) between cells. A parameter set refers to the design of signals in a certain RAT, the set of communication parameters that characterize the design of the RAT.

User terminal 20 is capable of connecting to both base station 11 and base station 12. The user terminal 20 envisages the simultaneous use of a macro cell C1 and a small cell C2 utilizing different frequencies through Carrier Aggregation (CA) or Dual Connectivity (DC). The user terminal 20 can apply Carrier Aggregation (CA) or Dual Connectivity (DC) using a plurality of cells (CCs), for example, 2 or more CCs. The user terminal can utilize the licensed band CC and the unlicensed band CC as a plurality of cells. The TDD carrier to which the shortened TTI is applied may be included in any of the plurality of cells.

The user terminal 20 and the base station 11 can communicate with each other using a carrier having a narrow bandwidth (referred to as an existing carrier, a legacy carrier, or the like) at a relatively low frequency band (e.g., 2 GHz). The user terminal 20 and the base station 12 may use a carrier having a relatively high frequency band (e.g., 3.5GHz, 5GHz, 30 to 70GHz, etc.) and a carrier having the same bandwidth as that of 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 between the two base stations 12) may be configured to perform wired connection (for example, an optical fiber conforming to a Common Public Radio Interface (CPRI), an X2 Interface, or the like) or wireless connection.

The base station 11 and each base station 12 are connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. The upper station apparatus 30 includes, for example, an access gateway apparatus, 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, 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 area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, an HeNB (home evolved node b), an RRH (Remote Radio Head), a transmission/reception point, or the like. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

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 radio access schemes. OFDMA is a multicarrier 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 composed of one or consecutive resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between terminals. The uplink and downlink radio access schemes are not limited to the combination of them, and OFDMA may be used for the uplink.

In the radio communication system 1, as the DL Channel, a Downlink data Channel (also referred to as a Physical Downlink Shared Channel (PDSCH)), a Downlink Shared Channel, etc., a Broadcast Channel (Physical Broadcast Channel (PBCH)), an L1/L2 control Channel, etc., which are Shared by the user terminals 20, are used. User data, higher layer control Information, SIB (System Information Block), and the like are transmitted through the PDSCH. MIB (Master Information Block) is transmitted through PBCH.

The L1/L2 Control channels include a Downlink Control Channel (Physical Downlink Control Channel (PDCCH)), an Enhanced Physical Downlink Control Channel (EPDCCH), a PCFICH (Physical Control Format Indicator Channel), a PHICH (Physical Hybrid-ARQ Indicator Channel), and the like, and Downlink Control Information (DCI)) including scheduling Information of a PDSCH and a PUSCH is transmitted through the PDCCH.

In the radio communication system 1, as the UL Channel, an Uplink data Channel (also referred to as a Physical Uplink Shared Channel (PUSCH)), an Uplink Shared Channel, or the like), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH)), a Random Access Channel (Physical Random Access Channel (PRACH)), or the like, which is Shared by each user terminal 20, is used. User data, higher layer control information, etc. are transmitted through the PUSCH. Uplink Control Information (UCI)) including at least one of acknowledgement Information (ACK/NACK), radio quality Information (CQI), and the like is transmitted through the PUSCH or PUCCH. A random access preamble for establishing a connection with a 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 transmission/reception antennas 101, an amplifier unit 102, a transmission/reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The number of the transmission/reception antennas 101, the amplifier unit 102, and the transmission/reception unit 103 may be one or more. The base station 10 may be a downlink data transmitter and an uplink data receiver.

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 line interface 106.

In baseband signal processing section 104, for downlink Data, transmission processes such as PDCP (Packet Data Convergence Protocol) layer processing, user Data segmentation/combination, RLC (Radio Link Control) layer transmission processing such as RLC retransmission Control, MAC (Medium Access Control) retransmission Control (for example, HARQ transmission processing), scheduling, transport format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, and precoding processing are performed, and the downlink Data is transferred to transmitting/receiving section 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast fourier transform, and transferred to transmission/reception section 103.

Transmission/reception section 103 converts the baseband signal output from baseband signal processing section 104 by precoding for each antenna to the radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission/reception section 103 is amplified by the amplifier section 102 and transmitted from the transmission/reception antenna 101. The transmitting/receiving section 103 can 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 transmission/reception section 103 may be configured as an integrated transmission/reception section, or may be configured by a transmission section and a reception section.

For an uplink signal, a radio frequency signal received by transmission/reception antenna 101 is amplified by amplifier section 102. Transmission/reception section 103 receives the uplink signal amplified by amplifier section 102. Transmitting/receiving section 103 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, reception processing of MAC retransmission control, and reception processing of the RLC layer and the 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 releasing of a communication channel, state management of base station 10, and management of radio resources.

The transmission line 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 an inter-base station Interface (e.g., an optical fiber compliant with a Common Public Radio Interface (CPRI), an X2 Interface).

The transmission/reception section 103 may further include an analog beamforming section for performing analog beamforming. The analog beamforming unit may be configured by an analog beamforming circuit (e.g., a phase shifter or a phase shift circuit) or an analog beamforming device (e.g., a phase shifter) described based on common knowledge in the technical field related to the present invention. The transmission/reception antenna 101 can be formed of an array antenna, for example. The transmission/reception unit 103 is configured to be able to apply single BF or multiple BF.

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

Transmission/reception section 103 transmits a downlink signal (e.g., a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, etc.), a discovery signal, a synchronization signal, a broadcast signal, etc.). The transmission/reception 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).

Transmission/reception section 103 may transmit higher layer parameters for setting MCS table and RNTI type.

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

Fig. 10 is a diagram showing an example of a functional configuration of a base station according to the present embodiment. In the figure, the functional blocks mainly showing the characteristic parts in the present embodiment are assumed that the base station 10 further includes 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.

Control section 301 performs overall control of 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 related to 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 by the reception signal processing unit 304 and the measurement of the signal by the measurement unit 305.

Control section 301 controls scheduling (e.g., resource allocation) of downlink signals and uplink signals. 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 generating section 302 generates a downlink signal (downlink control channel, downlink data channel, downlink reference signal such as DM-RS, etc.) based on an instruction from control section 301, and outputs the downlink signal to mapping section 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common knowledge in the technical field related to the present invention.

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

Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 103. For example, the received signal is an uplink signal (an uplink control channel, an uplink data channel, an uplink reference signal, and the like) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field related to the present invention.

The received 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. Further, 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 signal. The measurement unit 305 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present invention.

For example, measurement section 305 may measure the Received Power of the Received Signal (e.g., Reference Signal Received Power (RSRP)), the Received Quality (e.g., Reference Signal Received Quality (RSRQ)), the channel state, and the like. The measurement result 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 transmission/reception antennas 201, an amplifier unit 202, a transmission/reception unit 203, a baseband signal processing unit 204, and an application unit 205. The number of the transmission/reception antenna 201, the amplifier unit 202, and the transmission/reception unit 203 may be one or more. The user terminal 20 may be a downlink data receiving apparatus or an uplink data transmitting apparatus.

The radio frequency signal received by the transmission and reception antenna 201 is amplified by the amplifier unit 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. Transmitting/receiving section 203 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to baseband signal processing section 204. The transmitting/receiving section 203 can be constituted 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 transmission/reception unit 203 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit.

Baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of 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, system information, higher layer control information is 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. Baseband signal processing section 204 performs transmission processing for retransmission control (for example, transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, and the like, and transfers the result to transmitting/receiving section 203. Transmission/reception section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmission/reception section 203 is amplified by the amplifier section 202 and transmitted from the transmission/reception antenna 201.

The transmission/reception section 203 may further include an analog beamforming section for performing analog beamforming. The analog beamforming unit may be configured by an analog beamforming circuit (e.g., a phase shifter or a phase shift circuit) or an analog beamforming device (e.g., a phase shifter) described based on common knowledge in the technical field related to the present invention. The transmission/reception antenna 201 can be formed of an array antenna, for example. The transmission/reception unit 203 is configured to be able to apply single BF or multiple BF.

Transmission/reception section 203 may transmit a signal using a transmission beam or may receive a signal using a reception beam. Transmission/reception section 203 may transmit and receive signals using the specific beam determined by control section 401.

Transmission/reception section 203 receives a downlink signal (e.g., a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, or the like), a discovery signal, a synchronization signal, a broadcast signal, or the like). Transmission/reception section 203 transmits 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).

Transmission/reception section 203 may receive a higher layer parameter for setting the MCS table and 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, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be the functional blocks necessary for the user terminal 20 to also have wireless communication. 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 received signal processing section 404, and a measurement section 405.

The control unit 401 performs overall control of the 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.

Control section 401 controls generation of a signal in transmission signal generation section 402 and allocation of a signal in mapping section 403, for example. Control section 401 controls reception processing of a signal in received signal processing section 404 and measurement of a signal in measurement section 405.

When a reference signal for measurement (for example, CSI-RS or SSB) and a downlink channel (PDCCH or PDSCH) are set to the same time resource (symbol), control section 401 may control reception of the reference signal and the downlink channel according to whether downlink transmission using a specific MCS table (MCS table 3, for example, qam64LowSE) can be set.

Control section 401 may perform control so that, when the measurement reference signal (for example, CSI-RS or SSB) and the PDCCH are set in the same time resource (symbol), if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example, qam64LowSE) can be set, the PDCCH is selected and received.

Control section 401 may perform control so that, when the measurement reference signal (for example, CSI-RS or SSB) and the PDSCH are set to the same time resource (symbol), if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example, qam64LowSE) can be set, the PDSCH is selected and received.

Control section 401 may also perform control so as to select and receive an aperiodic CSI-RS (a-CSI-RS) if it is determined that downlink transmission using a specific MCS table (MCS table 3, for example, qam64LowSE) can be set when the aperiodic CSI-RS (a-CSI-RS) and PDCCH are set to the same time resource (symbol). In this case, control section 401 may determine that downlink transmission using a specific MCS table (MCS table 3, for example, qam64LowSE) can be set when DCI that triggers aperiodic CSI-RS (a-CSI-RS) is scrambled with a specific RNTI (new RNTI).

Transmission signal generating section 402 generates an uplink signal (uplink control channel, uplink data channel, uplink reference signal, and the like) based on an instruction from control section 401, and outputs the uplink signal to mapping section 403. The transmission signal generation unit 402 can 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.

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

Mapping section 403 maps the uplink signal generated by transmission signal generating section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmitting/receiving section 203. Mapping section 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.

Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from 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 section 404 can be constituted by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field related to the present invention. The received signal processing section 404 can constitute a receiving section according to the present invention.

Received signal processing section 404 blind-decodes 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 received 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 received signal processing unit 404 outputs information decoded by the reception processing to the control unit 401. Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to control section 401. The received signal processing unit 404 may also output the decoding result of the data to the control unit 401. Received signal processing section 404 outputs the received signal and the signal after the reception processing to measuring section 405.

The measurement unit 405 performs measurements related to the received signal. The measurement unit 405 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present invention.

The measurement unit 405 may also, for example, measure 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 in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one physically or logically combined device, or may be implemented by two or more physically or logically separated devices connected directly or indirectly (for example, by wire or wireless) and implemented by a plurality of these devices. The functional blocks may be implemented in combination with software in the above-described apparatus or apparatuses.

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

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 13 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 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 the present disclosure, the words of a device, circuit, apparatus, section, unit, and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the illustrated devices, or may not include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. The processing may be executed by 1 processor, or the processing may be executed by 1 or more processors simultaneously, sequentially, or by another method. 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, causing specific software (program) to be read into hardware such as the processor 1001 and the memory 1002, causing the processor 1001 to perform an operation to control communication via the communication device 1004, or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

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

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

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

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of a Floppy disk, a Floppy (registered trademark) disk, a magneto-optical 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, a key drive), a magnetic stripe, a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the transmission/ reception antennas 101 and 201, the amplifier units 102 and 202, the transmission/ reception units 103 and 203, the transmission line interface 106, and the like described above may be realized by the communication device 1004. The transmission/reception unit 103(203) may be physically or logically separated from the transmission unit 103a (203a) and the reception unit 103b (203 b).

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

The processor 1001 and the memory 1002 are connected to each other via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

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

(modification example)

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 (signal or signaling) may be substituted for one another. The signal may also be a message. The reference signal may also be referred to as rs (reference signal) for short, and may also be referred to as Pilot (Pilot), Pilot signal, or the like according to the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

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

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

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

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

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other names corresponding thereto.

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

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

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

When 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 be the minimum time unit for scheduling. The number of slots (mini-slots) constituting the minimum time unit of the schedule may also be controlled.

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

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 greater than 1 ms.

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

A Resource Block (RB) may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of the 1 TTI and 1 subframe may be configured by 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 (REGs), PRB pairs, RB pairs, and so on.

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

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the configuration of the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and Resource Blocks (RBs) included in a slot or mini-slot, the number of subcarriers included in a Resource Block (RB), the number of symbols in the 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 by absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

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

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

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

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

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

Physical Layer signaling may also be referred to as L1/L2 (Layer1/Layer 2(Layer1/Layer2)) 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, and may also be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (MAC CE), for example.

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

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

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

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

The terms "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 Configuration Indication state)", "spatial relationship (spatial relationship)", "spatial domain filter (spatial domain filter)", "Transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station", "NodeB", "enodeb (enb)", "gnnodeb (gnb)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", "cell group", "carrier", "component carrier", "Bandwidth Part (BWP)", and the like can be used interchangeably. A base station is also sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

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

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

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

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

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

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

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

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

The aspects/embodiments described in the present disclosure may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (fourth generation Mobile communication System), 5G (fifth generation Mobile communication System), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (Future Radio Access), GSM (registered trademark) (Global System for Mobile communication), and CDMA (Radio Broadband) SUPER Mobile communication System (CDMA 2000) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate wireless communication method, a next generation system extended based on them, and the like. Furthermore, a plurality of systems (for example, LTE, or a combination of LTE-a and 5G) may be combined and applied.

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

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

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determining" may be considered as "determining" a determination (e.g., a determination), a calculation (calculating), a processing (processing), a derivation (deriving), an investigation (investigating), a search (logging up, search, inquiry) (e.g., a search in a table, a database, or another data structure), a confirmation (authenticating), and the like.

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

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

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

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

The term "connected", "coupled" or any variant thereof used in the present disclosure means all direct or indirect connections or couplings between 2 or more elements, and can include 1 or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed".

In the present disclosure, when two elements are connected, it is possible to consider using one or more electric wires, cables, printed electric connections, and the like, and as some non-limiting (non-limiting) and non-inclusive examples, two elements are "connected" or "coupled" to each other using electromagnetic energy having a wavelength in a radio frequency domain, a microwave domain, a light (both visible and invisible) domain, and the like.

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

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

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

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

Claims (6)

1. A user terminal, comprising:

a receiving unit configured to receive a specific reference signal and a downlink channel; and

and a control unit configured to control reception of the reference signal and the downlink channel according to whether or not 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.

2. The user terminal of claim 1,

the control unit performs control such that, when the reference signal and a downlink control channel (PDCCH) are set to the same time resource, if it is determined that downlink transmission using the specific MCS table can be set, the PDCCH is selected and received.

3. The user terminal of claim 1,

the control unit performs control so that, when the reference signal and a downlink shared channel (PDSCH) are set to the same time resource, if it is determined that downlink transmission using the specific MCS table can be set, the PDSCH is selected and received.

4. The user terminal of claim 1,

the control unit performs control such that, when a reference signal (A-CSI-RS) for aperiodic channel state measurement and a downlink control channel (PDCCH) are set to the same time resource, if it is determined that downlink transmission using the specific MCS table can be set, the A-CSI-RS is selected and received.

5. The user terminal of claim 4,

the control unit determines that downlink transmission using the specific MCS table can be set when the DCI triggering the A-CSI-RS is scrambled by a specific RNTI.

6. A wireless communication method, comprising:

a step of receiving a specific reference signal and a downlink channel; and

and controlling 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.

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