User terminal and radiocommunication method

Abstract

To properly communicate a control channel even when communication is performed using a control channel configuration different from those in legacy LTE systems, one aspect of the user terminal includes: a receiving section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls the monitoring of a downlink control channel candidate, and the control section performs the control to allocate a number of downlink control channel candidates to each control resource adjusted such that the number of downlink control channel candidates does not exceed a predetermined value per combination of control resource sets in a predetermined time unit.

Description

1 / 69 USER TERMINAL AND RADIOCOMMUNICATION METHOD Technical Field

[001] The present invention relates to a user terminal and a radio communication method of a next-generation mobile communication system. Technical Background

[002] In Universal Mobile Telecommunications System (UMTS) networks, for the purposes of higher data rates and lower latency, Long Term Evolution (LTE) was specified (Non-Patent Literature 1). In addition, for the purposes of wider bandwidths and higher speeds than LTE (also referred to as LTE Rel. 8 or 9), LTE-Advanced (LTE-A, also referred to as LTE Rel. 10, 11 or 12) was specified and LTE successor systems (also referred to as, for example, Future Radio Access (FRA), fifth-generation mobile communication system (5G), 5G+ (plus), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX) or LTE Rel. 13, 14, 15 or subsequent releases) were also studied.

[003] In addition, legacy LTE systems (e.g., LTE Rel. 8 to 13) perform communication on the Downlink (DL) and / or Uplink (UL) using a subframe (also known as Transmission Time Intervals (TTI)) of one ms. The subframe is a unit of transmission time of a channel-encoded data packet and is a unit of scheduling, link adaptation, and retransmission control processing (HARQ: Hybrid Automatic Repeat Request).

[004] A base radio station controls the allocation (scheduling) of data to a user terminal and notifies the user terminal of the data scheduling using Downlink Control Information (DCI). The user terminal monitors a control channel of Petition 870200034103, dated 03 / 13 / 2020, page 10 / 91 2 / 69 downlink (PDCCH) in which downlink control information is transmitted, performs reception processing (demodulation and decoding processing) and controls the reception of DL data and / or transmission of uplink data based on the received downlink control information.

[005] Downlink control channel (PDCCH / EPDCCH) transmission is controlled using an aggregation of one or a plurality of Control Channel Elements (CCE) / Enhanced Control Channel Elements (ECCE). In addition, each control channel element includes a plurality of Resource Element Groups (REG / Enhanced Resource Element Groups (EREG)). The resource element group is also used when a control channel is mapped to a Resource Element (RE). List of Citations Non-Patented Literature

[006] Non-Patent Literature 1: 3GPP TS 36.300 V8.12.0 Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8), April 2010 Summary of the Invention Technical Problem

[007] It is assumed that future radio communication systems (e.g., LTE Rel. 14, 15 and subsequent releases, 5G and NR) control data scaling through a different configuration than legacy LTE systems (e.g., LTE Rel. 13 or earlier releases). More specifically, future radio communication systems are required to support the flexible use of numerologies and a frequency and to perform a Petition 870200034103, dated 03 / 13 / 2020, page 11 / 91 3 / 69 dynamic frame configuration. Numerologies refer, for example, to communication parameters (e.g., subcarrier spacing and bandwidth) applied to the transmission and reception of a given signal.

[008] Furthermore, studies are being conducted for future radio communication systems that use a configuration for a control channel different from that of legacy LTE systems. In this case, there is a risk that, when the transmission and / or reception of a downlink control channel is controlled in a manner similar to legacy LTE systems, communication may not be performed adequately.

[009] The present invention was made in light of this point and one of the objects of the present invention is to provide a user terminal and a radio communication method that can adequately communicate a control channel, even when performing communication, applying a control channel configuration different from that of legacy LTE systems. Solution to the Problem

[010] A user terminal according to one aspect of the present invention includes: a receiving section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls the monitoring of a downlink control channel candidate, and the control section performs the control to allocate a number of downlink control channel candidates to each control resource set, such that the number of downlink control channel candidates does not exceed a predetermined value per combination of control resource sets in a predetermined time unit. Petition 870200034103, dated 03 / 13 / 2020, page 12 / 91 4 / 69 Advantageous Effects of the Invention

[011] According to the present invention, it is possible to properly communicate a control channel, even when performing the communication, applying a control channel configuration different from that of legacy LTE systems. Brief Description of the Figures

[012] Figs. 1A and 1B are diagrams that illustrate an example of legacy LTE downlink control channels and a future radio communication system.

[013] Fig. 2A is a diagram illustrating a set of control resources in which an identical monitoring periodicity has been configured and Fig. 2B is a diagram illustrating a set of control resources in which a different monitoring periodicity has been configured.

[014] Fig. 3A is a diagram that illustrates three sets of control resources with different monitoring periodicities and Fig. 3B is a diagram that illustrates configuration patterns of downlink control channel candidate numbers according to a first mode (first aspect).

[015] Fig. 4 is a diagram that illustrates configuration patterns of candidate numbers for downlink control channels according to the first mode (second aspect).

[016] Fig. 5 is a diagram that illustrates configuration patterns of downlink control channel candidate numbers according to the first mode (third aspect).

[017] Fig. 6A is a diagram illustrating three sets of control resources with different monitoring periodicities and Fig. 6B is a diagram illustrating configuration patterns of the number of candidates to Petition 870200034103, dated 03 / 13 / 2020, page 13 / 91 5 / 69 downlink control channels according to a second mode (first aspect).

[018] Fig. 7 is a diagram that illustrates configuration patterns of downlink control channel candidate numbers according to the second mode (second aspect).

[019] Fig. 8 is a diagram illustrating an example of a schematic configuration of a radio communication system according to an embodiment of the present invention.

[020] Fig. 9 is a diagram illustrating an example of a general configuration of a base radio station according to an embodiment of the present invention.

[021] Fig. 10 is a diagram illustrating an example of a base radio station function configuration according to an embodiment of the present invention.

[022] Fig. 11 is a diagram illustrating an example of a general configuration of a user terminal according to an embodiment of the present invention.

[023] Fig. 12 is a diagram illustrating an example of a user terminal function configuration according to an embodiment of the present invention.

[024] Fig. 13 is a diagram illustrating an example of hardware configurations of the base radio station and the user terminal according to an embodiment of the present invention. Description of the Modalities

[025] In legacy LTE systems, a base radio station transmits Downlink Control Information (DCI) using a downlink control channel (e.g., a Link Control Channel Petition 870200034103, dated 03 / 13 / 2020, page 14 / 91 6 / 69 Physical Downlink Control (PDCCH) or an enhanced PDCCH (EPDCCH) for a UE. The transmission of downlink control information can be read as the transmission of a downlink control channel.

[026] DCIs may be scaling information including at least one of, for example, information indicating time / frequency resources for data scaling, information indicating a transport block size, information indicating a data modulation scheme, information indicating a HARQ process identifier, and information relating to an RS demodulation. DCIs for scaling the reception of DL data and / or the measurement of a DL reference signal may be referred to as a DL assignment or a DL grant, and DCIs for scaling the transmission of UL data and / or the transmission of a UL sound signal (measurement) may be referred to as a UL grant.

[027] DL assignment and / or UL grant may include information related to a channel feature, sequence, or transmission format for transmitting a UL control signal (UCI: Uplink Control Information) as HARQACK feedback for DL ​​data or channel metering information (CSI: Channel State Information). Additionally, DCIs for scaling the UL control signal (UCI: Uplink Control Information) may be specified separately from DL assignment and UL grant.Which DCIs among DL assignment, UL grant, and UCI scheduling are the DCIs can be decided based on which value is a value of a specific bit field included in the DCIs, can be decided based on which, among a plurality of predetermined values, is a DCI payload size, or can be decided based on which resource domain the DCIs were detected in, assuming that each DCI is previously mapped to one. Petition 870200034103, dated 03 / 13 / 2020, page 15 / 91 7 / 69 different resource domain in advance.

[028] The UE is configured to monitor a set of a predetermined number of downlink control channel candidates in a predetermined time unit (e.g., subframe). In this sense, monitoring refers, for example, to attempting to decode the set of each downlink control channel from a target DCI format. This decoding will also be referred to as Blind Decoding (BD) or blind detection. The downlink control channel candidate is also referred to as a BD candidate or a (E)PDCCH candidate.

[029] The set of candidate downlink control channels (a plurality of candidate downlink control channels) that needs to be monitored will also be called the search space. A base station organizes the DCIs into predetermined candidate downlink control channels included in the search space. The UE blindly decodes one or more candidate resources in the search space and detects the DCIs from the UE. The search space can be configured by upper-layer signaling that is common among users or it can be configured by user-specific upper-layer signaling. In addition, two or more search spaces can be configured for the user terminal on the same carrier.

[030] Legacy LTE specifies a plurality of Aggregation Level (AL) types for the search space for link adaptation purposes. The ALs correspond to the number of Control Channel Elements (CCE) / Enhanced Control Channel Elements (ECCE) that make up the DCI. In addition, the search space is configured to include a plurality of downlink control channel candidates for a Petition 870200034103, dated 03 / 13 / 2020, page 16 / 91 8 / 69 correct AL. Each candidate for downlink control channels includes one or more resource units (the CCE and / or the ECCE).

[031] A Cyclic Redundancy Check (CRC) bit is attached to the DCIs. This CRC is masked (scrambled) by a UE-specific identifier (e.g., C-RNTI: Temporary Radio and Cell Network Identifier) ​​or by an identifier that is common to a system. The UE can detect DCIs whose CRC has been scrambled by a C-RNTI associated with a self-contained terminal and DCIs whose CRC has been scrambled by the identifier that is common to the system.

[032] In addition, the search space includes a common search space that is normally configured for UEs and a UE-specific search space that is configured per UE. In the UE-specific search space of a PDCCH according to legacy LTE, the AL (= the number of CCEs) is one, two, four and eight. The number of BD candidates is specified as six, six, two and two for AL = one, two, four and eight, respectively.

[033] In legacy LTE systems, a downlink control channel (or downlink control information) is transmitted using the entire system bandwidth (see Fig. 1A). Therefore, the UE needs to monitor the entire system bandwidth and receive downlink control information (blind decoding) regardless of whether or not DL data is allocated in each subframe.

[034] In contrast to this, it is believed that, instead of performing communication using the entire system band on a predetermined carrier all the time, future radio communication systems will dynamically or semi-statically configure a predetermined frequency domain (also referred to as a frequency band) based Petition 870200034103, dated 03 / 13 / 2020, page 17 / 91 9 / 69 in the use of communication and / or communication environment and communication control. For example, it is believed that future radio communication systems will not necessarily allocate downlink control information to a certain UE for the entire system band and transmit downlink control information, but will configure a predetermined frequency domain and control the transmission of downlink control information (see Fig. 1B).

[035] A radio resource including the predetermined frequency domain and time domain (e.g., one OFDM symbol and two OFDM symbols) configured in the UE will be referred to as a control resource set (CORESET), a control resource set, a control sub-band, a search space set, a search space resource set, a control domain, a control sub-band, or an NR-PDCCH domain.

[036] The control resource set is configured on a predetermined resource unit and can be configured to a system bandwidth (carrier bandwidth) or a maximum or less bandwidth at which the user terminal can perform receive processing. For example, the control resource set can consist of one or a plurality of RBs (PRBs and / or VRBs) in a frequency direction. In this respect, RB means, for example, a frequency resource block unit including 12 subcarriers. The UE can monitor downlink control information within a range of the control resource set and control the reception of downlink control information. Consequently, the UE does not need to monitor the entire system bandwidth all the time during the reception processing of downlink control information. Petition 870200034103, dated 03 / 13 / 2020, page 18 / 91 10 / 69 downward and reduce energy consumption.

[037] In addition, the control resource set is a resource onto which downlink control information is mapped, or a frame of a time resource and / or a frequency resource on which the NRPDCCH is organized. Furthermore, the control resource set can be defined based on the resource unit size. For example, the size of a control resource set can be configured to a size that is an integer multiple of the resource unit size. Additionally, the control resource set can be composed of contiguous or non-contiguous resource units.

[038] The resource unit is a resource unit to be allocated to the NR-PDCCH and can be one of a PRB, a pair of PRBs, an NR-CCE, an NRREG, and a group of NR-REGs.

[039] Hereafter, it is assumed that a plurality of control feature sets are configured for an UE and a monitoring periodicity is configured for each control feature set. It is assumed that the monitoring periodicity configured for each control feature set is identical or different between the control feature sets. The UE performs blind decoding based on the monitoring periodicity configured per control feature set. Under this assumption, it is necessary to study how the number of times blind decoding needs to be allocated among the control feature sets to optimize.

[040] Figs. 2A and 2B illustrate three sets of control resources. Fig. 2A illustrates a state in which the monitoring periodicities of all sets of control resources (CORESETs No. 1 and No. 3) are configured for two slots (or two symbols). When the monitoring periodicity Petition 870200034103, dated 03 / 13 / 2020, page 19 / 91 11 / 69 identical is configured for all control resource sets (CORESETs No. 1 and No. 3) as illustrated in Fig. 2A, the number of candidates for downlink control channels (the number of times of blind decoding) becomes uniform in all slots that are monitoring occasions.

[041] On the other hand, Fig. 2B illustrates a state in which different monitoring periodicities are configured among the three sets of control resources (CORESETs No. 1 and No. 3). While there is a slot S13 in which the identical slot is a monitoring occasion among the three sets of control resources (CORESETs No. 1 and No. 3), there are slots S15 and S19 that become monitoring occasions in one or two sets of control resources. When different monitoring periodicities are configured among the sets of control resources (CORESETs No. 1 and No. 3) as illustrated in Fig. 2B, the number of candidates for downlink control channels (the number of blind decoding times) fluctuates by slot that is a monitoring occasion.

[042] Therefore, the inventors focused on the fact that the number of sets of control features configured per predetermined time unit (e.g., a slot, a symbol, and a substructure) can change and generate a maximum value of a total of the numbers of candidates for downlink control channels to be monitored in the predetermined unit a predetermined value or less regardless of the number of sets of control features configured in the predetermined time unit.

[043] Embodiments according to the present invention will be described in detail below with reference to the drawings. A radiocommunication method according to each embodiment may be applied alone or in combination. Petition 870200034103, dated 03 / 13 / 2020, page 20 / 91 12 / 69 (First Mode)

[044] The first embodiment is a user terminal that includes: a receiving section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls the monitoring of a downlink control channel candidate, and the user terminal configures the number of downlink control channel candidates in a predetermined time unit (e.g., slot) to a combination of control resource sets, and performs control so that the number of downlink control channel candidates is allocated to each of the control resource sets so that the number of downlink control channel candidates does not exceed a predetermined value per combination of control resource sets.

[045] For example, a case will be assumed where a plurality of control resource sets with a monitoring periodicity is configured for the UE. A maximum value for the number of downlink control channel candidates (the number of blind decoding times) to be monitored in the predetermined time unit is configured for a combination of control resource sets, including the individual control resource sets. Furthermore, the allocation of the number of downlink control channel candidates to each control resource set is configured by combination of control resource sets. In the following description, the number of downlink control channel candidates to be allocated to each control resource set will be referred to as a configuration value. The number of downlink control channel candidates in the time unit Petition 870200034103, dated 03 / 13 / 2020, page 21 / 91 The predetermined value 13 / 69 configured for the combination of control resource sets is the maximum value above or the configuration value.

[046] Furthermore, a set of candidate downlink control channels (a plurality of candidates downlink control channels) that needs to be monitored will also be referred to as a search space. In addition, the search space is specified by an aggregation level indicating the numbers of Control Channel Elements (CCE) / Enhanced Control Channel Elements (ECCE) that make up DCI. Therefore, the set of control features in which the number of candidates downlink control channels (the number of times of blind decoding) is configured can be paraphrased as the search space or the aggregation level.

[047] Consequently, even when a plurality of control resource sets of different monitoring periodicities are configured for the UE and the monitoring occasions (e.g., slots) of a plurality of control resource sets overlap, it is possible to perform the control to allocate the number of downlink control channel candidates to each of the control resource sets so that the number of downlink control channel candidates does not exceed the predetermined value by combining the control resource sets. Although the number of downlink control channel candidates (the number of blind decoding times) to be monitored in the predetermined time unit fluctuates, it is possible to perform the control so that the number of downlink control channel candidates does not exceed the predetermined value configured in advance. <Primeiro Aspecto> Petition 870200034103, dated 03 / 13 / 2020, page 22 / 91 14 / 69

[048] The first aspect is a UE that includes: a receiving section that receives a downlink control channel transmitted by each of a plurality of control resource sets; and a control section that controls the monitoring of downlink control channel candidates, and the user terminal configures the number of downlink control channel candidates in a predetermined time unit for a combination of control resource sets, and controls the allocation of the number of downlink control channel candidates to each of the control resource sets so that the configured number of downlink control channel candidates does not exceed the terminal's capacity.

[049] In addition, the first aspect is a base station which includes: a receiving section that receives the terminal capacity of the number of candidates for downlink control channels from a user terminal; and a control section that controls a configuration of a set of control resources for the user terminal and the base station configures the number of candidates for downlink control channels in a predetermined time unit for a combination of sets of control resources, and controls the allocation of the number of candidates for downlink control channels to each of the sets of control resources so that the number of candidates for downlink control channels does not exceed the terminal capacity by combination of sets of control resources.

[050] For example, a case will be assumed in which a plurality of control resource sets of different monitoring periodicities are configured for a UE. Although a maximum value of the number of candidates for downlink control channels (the number Petition 870200034103, dated 03 / 13 / 2020, page 23 / 91 15 / 69 times of blind decoding) to be monitored in the predetermined time unit is configured for a combination of control feature sets, including individual control feature sets, each maximum value is controlled as a numeric value that does not exceed a maximum value (referred to as UE capacity below) of the number of downlink control channel candidates (the number of blind decoding (BD) times) that the UE can monitor in a predetermined time zone. That is, this is an example where a configuration that exceeds the UE capacity is not allowed, even in the case of a maximum value of any combination of control feature sets.

[051] Fig. 3A illustrates three sets of control resources (CORESETs No. 1 and No. 3) with different monitoring periodicities. The monitoring periodicity of the first set of control resources (CORESET No. 1) is configured for two slots (or two symbols) and M is configured as a configuration value and a maximum value of the number of candidates for downlink control channels (the number of times of blind decoding). The number of candidates for downlink control channels of the first set of control resources (CORESET No. 1) is configured to the identical value M on any monitoring occasion (one slot or one symbol).

[052] The monitoring periodicity of a second set of control resources (CORESET No. 2) is configured for three slots (or three symbols) and N is configured as a configuration value and a maximum value of the number of candidates for downlink control channels (the number of times of blind decoding). The number of candidates for downlink control channels of the second set of control resources (CORESET No. 2) is configured to N on any occasion of Petition 870200034103, dated 03 / 13 / 2020, page 24 / 91 16 / 69 monitoring.

[053] The monitoring periodicity of a third set of control resources (CORESET No. 3) is set to 12 slots (or 12 symbols) and K is set as a configuration value and a maximum value of the number of candidates for downlink control channels (the number of times of blind decoding). The number of candidates for downlink control channels of the third set of control resources (CORESET No. 3) is set to K on any monitoring occasion.

[054] Although a total value (M+N+K) of the number of candidates for downlink control channels (the number of times of blind decoding) in the predetermined time unit (e.g., the slot or symbol) where monitoring occasions of the three sets of control resources (CORESETs No. 1 and No. 3) overlap and maximize, the total value does not exceed the UE capacity (= M+N+K). This example assumes that the UE capacity is equal to or greater than (M+N+K).

[055] Fig. 3B illustrates configuration patterns for the maximum values ​​and configuration values ​​of the downlink control channel candidate numbers, assuming a case where the three control resource sets (CORESETs No. 1 and No. 3) are configured for the UE. As illustrated in Fig. 3B, the maximum value of the downlink control channel candidate number (the number of blind decoding times) to be monitored in the predetermined time unit is configured for a combination of control resource sets, including the individual control resource sets (CORESETs No. 1 and No. 3), and, in addition, the configuration value allocated so that the number of downlink control channel candidates does not exceed the maximum value is configured for Petition 870200034103, dated 03 / 13 / 2020, page 25 / 91 17 / 69 each set of control features by combining the sets of control features.

[056] In an example illustrated in Fig. 3A, the monitoring occasions of the first, second, and third sets of control resources (CORESETs No. 1 and No. 3) overlap in a head slot S1 and a 13th slot S13 from the head. In the monitoring occasion to monitor the three sets of control resources (CORESETs No. 1 and No. 3) in the predetermined time unit, the number of candidates for downlink control channels (the number of blind decoding times) in the UE is the maximum value (M+N+K). This example assumes that the UE capacity is equal to or greater than (M+N+K) and therefore all maximum values ​​configured for the combinations of control resource sets are configured not to exceed the UE capacity, as illustrated in Fig. 3B.

[057] Furthermore, an S14 slot in which only the first set of control resources (CORESET No. 1) exists is limited to the maximum value (= M) of the number of candidates for downlink control channels (the number of blind decoding times) configured for the first set of control resources (CORESET No. 1). Additionally, in an S19 slot, in which the first and second sets of control resources (CORESETs No. 1 and No. 2) overlap, it is limited to the total value (M+N) of the configuration value (= M) of the number of candidates for downlink control channels (the number of blind decoding times) configured for the first set of control resources (CORESET No. 1) and the configuration value (= N) of the number of candidates for downlink control channels (the number of blind decoding times) configured for the second set of control resources (CORESET No. 2).

[058] The base station assumes that the three sets of resources of Petition 870200034103, dated 03 / 13 / 2020, page 26 / 91 18 / 69 control (CORESETs No. 1 and 3) illustrated in Figs. 3A and 3B are configured for the UE. The base station can configure the three sets of control features (CORESETs No. 1 and 3) in the UE by UE-specific upper-layer signaling. The configuration of the control feature sets (CORESET No. 1 and 3) can include monitoring periodicities and configuration values ​​and maximum values ​​of the number of downlink control channel candidates (the number of blind decoding times).

[059] The base station requests from the UE the UE capacity (or specified capacity) related to the number of candidates for the downlink control channel (the number of times of blind decoding). The base station sets the maximum value that does not exceed the UE capacity reported from the UE, for the combination of control resource sets, including the individual control resource sets (CORESETs No. 1 and No. 3), and allocates the configuration value for each control resource set so that the configuration value does not exceed the maximum value.

[060] It can be said that the base station configures the maximum values ​​and configuration values ​​of the downlink control channel candidate numbers (the number of blind decoding times) for the control resource sets (CORESETs No. 1 and No. 3) to perform the allocation (blind decoding division) of the downlink control channel candidate number among the control resource sets. Thus, the base station performs control so that the maximum value of the downlink control channel candidate number (the number of blind decoding times) does not exceed the UE capacity in any combination of a plurality of control resource sets.

[061] The EU assumes that the three sets of control resources Petition 870200034103, dated 03 / 13 / 2020, page 27 / 91 19 / 69 (CORESETs No. 1 and 3) illustrated in Figs. 3A and 3B are configured. The UE configures the three sets of control resources (CORESETs No. 1 and 3) by UE-specific upper-layer signaling. The configuration of the control resource sets (CORESET No. 1 and 3) includes the monitoring periodicities and configuration values ​​and the maximum values ​​of the number of candidates for downlink control channels (the number of times of blind decoding).

[062] The UE specifies a monitoring occasion based on the monitoring periodicity per control feature set (CORESETs No. 1 and No. 3) and controls the number of blind decoding times, so that the number of blind decoding times does not exceed the maximum value configured by the combination of control feature sets. Even when, for example, the monitoring occasions of all control feature sets (CORESETs No. 1 and No. 3) overlap in the same predetermined time unit (e.g., slot), the total number of blind decoding times does not exceed the UE's UE capacity. Consequently, it is possible to avoid an operational failure caused when blind decoding exceeds the UE's capacity.

[063] Thus, according to the first aspect, the maximum value and the configuration value of the number of candidates for downlink control channels (the number of blind decoding times) that does not exceed the UE capacity are configured for all combinations of control resource sets, so that the number of candidates for downlink control channels (the number of blind decoding times) is allocated to a plurality of control resource sets, so that the number of candidates for downlink control channels does not exceed the UE capacity. When the number of blind decoding times Petition 870200034103, dated 03 / 13 / 2020, page 28 / 91 When 20 / 69 exceeds the UE capacity, a problem arises where UE operation becomes unstable. However, regarding the first aspect, it is possible to avoid a failure by allocating the number of candidate channels to downlink control channels (the number of blind decoding times) that exceed the UE capacity, thus preventing UE operation from becoming unstable. <Segundo aspecto>

[064] According to the second aspect, when the number of candidates for downlink control channels that need to be monitored in the predetermined time unit (e.g., slot) is performed control in such a way as not to monitor part or all of the candidates for downlink control channels.

[065] Furthermore, according to the second aspect, when the number of candidates for downlink control channels that need to be monitored in the predetermined time unit (e.g., slot) exceeds the predetermined value, some of the candidates for downlink control channels are monitored and an uplink signal is transmitted based on the detected downlink control channels.

[066] Similarly to the first aspect, the maximum number of candidates for downlink control channels (the number of blind decoding times) to be monitored in the predetermined time unit is configured for a combination of control resource sets, including the individual resource sets (CORESETs No. 1 and No. 3), and, in addition, the configuration value allocated so that the number of candidates for downlink control channels does not exceed the maximum value is configured for each control resource set by combination of control resource sets. However, the second aspect allows Petition 870200034103, dated 03 / 13 / 2020, page 29 / 91 21 / 69 is a configuration in which the maximum number of candidates for downlink control channels exceeds a predetermined value (e.g., UE capacity) in a combination of parts of the control resource sets.

[067] In a case where the number of downlink control channel candidates to be monitored in the predetermined time unit (e.g., slot) exceeds the UE's capacity, the UE does not need to monitor downlink control channel candidates from all target control resource sets. Alternatively, the UE can monitor downlink control channel candidates only from optional control resource sets.

[068] An example will be described in which, similar to the first aspect, the three sets of control resources (CORESETs No. 1 and No. 3) are configured for the UE, and the monitoring periodicity and the number of candidates for downlink control channels (M, N or K) illustrated in Fig. 3A are configured for each set of control resources (CORESETs No. 1 and No. 3).

[069] Fig. 4 illustrates a state in which the maximum value of the number of candidates for downlink control channels (the number of times of blind decoding) to be monitored in the predetermined time unit is configured for the combination of control resource sets, including the individual control resource sets (CORESETs No. 1 and No. 3) and, in addition, the configuration allocated so that the number of candidates for downlink control channels does not exceed the maximum value is configured for each control resource set per combination of control resource sets.

[070] M is set as the configuration value and the maximum value. Petition 870200034103, dated 03 / 13 / 2020, page 30 / 91 22 / 69 of the number of candidates for downlink control channels (the number of blind decoding times) for the first control resource set (CORESET #1). The configuration value and the maximum value = M are configured not to exceed the UE capacity. Similarly, N is configured as the configuration value (= maximum value) of the number of candidates for downlink control channels (the number of blind decoding times) for the second control resource set (CORESET #2), and K is configured as the configuration value (= maximum value) of the number of candidates for downlink control channels for the third control resource set (CORESET #3). The configuration values ​​of the number of candidates for downlink control channels = N and K are configured not to exceed the UE capacity.Furthermore, the configuration values ​​and maximum values ​​(= M+N, M+K and N+K) of the number of downlink control channel candidates for a combination of two sets of control features are configured not to exceed the UE capacity.

[071] According to the second aspect, as illustrated in Fig. 4, the configuration value and the maximum values ​​(= M+N+K) of the downlink control channel candidate numbers (the number of blind decoding times) for a combination of the three control resource sets (CORESETs n° 1 and n° 3) are configured to exceed the UE capacity.

[072] Although the base station controls the configuration value and the maximum value of the combination of one or two sets of control resources, so that the configuration value and the maximum value do not exceed the UE capacity, the configuration value and the maximum value (= M+N+K) of the number of candidates for downlink control channels (the number of times of Petition 870200034103, dated 03 / 13 / 2020, page 31 / 91 23 / 69 blind decoding) from the combination of the three sets of control features (CORESETs No. 1 and No. 3) that maximizes the number of times blind decoding is configured to exceed the UE's capacity.

[073] The UE is configured so that the UE does not need to monitor downlink control channel candidates from the control resource set in which the number of downlink control channel candidates (the number of blind decoding times) exceeding the UE capacity has been configured (monitoring relief). When, for example, the number of downlink control channel candidates on a given monitoring occasion is configured to exceed the UE capacity, control can be performed to not monitor the number of downlink control channel candidates.

[074] In the example illustrated in Fig. 4, the UE does not need to monitor downlink control channel candidates once the configuration value (= M+N+K) of the number of downlink control channel candidates exceeds the UE's capacity on a monitoring occasion in which the three control resource sets (CORESETs 1 to 3) overlap. When, for example, the configuration value (= M+N+K) of the number of downlink control channel candidates exceeding the UE's capacity is configured, the UE does not monitor the downlink control channel candidates of one of the CORESETs of control resource set no. 1, no. 2 and no. 3.

[075] Alternatively, although the UE is configured so that the UE does not need to monitor downlink control channel candidates on an occasion of optional monitoring that exceeds a predetermined value (e.g., UE capacity), if monitoring is performed, a specified operation may be executed. Petition 870200034103, dated 03 / 13 / 2020, page 32 / 91 24 / 69

[076] For example, let us assume a case where the UE blindly decodes a set of optional control resources in a monitoring occasion with the configuration exceeding the UE's capacity and detects the DCIs to escalate a PDSCH or a PUSCH. In this case, the UE transmits HARQ-ACK for the PDSCH escalated by the DCIs or transmits the PUSCH escalated by the DCIs. That is, although it is optional to monitor the monitoring occasion for which the number of candidates for downlink control channels (= M+N+K) exceeds the UE's capacity, and therefore monitoring is relieved to the UE, when the UE performs monitoring and detects the DCIs, the UE executes the specified operation (HARQ-ACK transmission or PUSCH transmission).

[077] Alternatively, even if the UE performs monitoring at the time of monitoring with the configuration that exceeds the UE's capacity, the UE may not perform the specified operation.

[078] For example, let us assume a case where the UE performs blind decoding on a monitoring occasion with the configuration exceeding the UE's capacity and detects DCI to escalate a PDSCH or a PUSCH. In this case, the UE does not transmit HARQ-ACK for the PDSCH escalated by the DCI and does not transmit the PUSCH escalated by the DCI. That is, even if the UE performs monitoring on a monitoring occasion for which the number of candidates for downlink control channels (= M+N+K) exceeding the UE's capacity is configured, and detects DCI, the UE does not perform the specified operation (HARQ-ACK transmission or PUSCH transmission). <Terceiro Aspecto>

[079] According to the third aspect, when the number of candidates for downlink control channels that need to be Petition 870200034103, dated 03 / 13 / 2020, page 33 / 91 If the 25 / 69 monitored in the predetermined time unit (e.g., slot) exceeds the predetermined value, some of the candidate downlink control channels to be monitored are selected based on predetermined conditions.

[080] Similar to the first and second aspects, according to, for example, the third aspect, the maximum value of the number of candidates for downlink control channels (the number of times of blind decoding) to be monitored in the predetermined time unit is configured for a combination of control resource sets, including individual control resource sets (CORESETs No. 1 and No. 3) and, in addition, the configuration value allocated so that the number of candidates for downlink control channels does not exceed the maximum value is configured for each control resource set by combination of control resource sets.According to the third aspect, when the maximum number of candidates for downlink control channels is set to exceed the predetermined value (e.g., UE capacity), the UE selects a set of control resources based on a predetermined rule and monitors candidates for downlink control channels from a selected set of control resources.

[081] Fig. 5 illustrates a state in which the maximum number of downlink control channel candidates (the number of blind decoding times) to be monitored in the predetermined time unit is configured for a combination of control resource sets, including the individual control resource sets (CORESETs No. 1 and No. 3), and the configuration value allocated so that the number of downlink control channel candidates does not exceed the maximum value is configured for each control resource set by combination of Petition 870200034103, dated 03 / 13 / 2020, page 34 / 91 26 / 69 sets of control resources.

[082] M is configured as the configuration value and the maximum value of the number of candidates for downlink control channels in the predetermined time unit for the first set of control resources (CORESET No. 1), and the configuration value (maximum value) = M” is configured not to exceed the UE capacity. Similarly, N is configured as the configuration value and the maximum value of the number of candidates for downlink control channels for the second set of control resources (CORESET No. 2), and K” is configured as the configuration value and the maximum value of the number of candidates for downlink control channels for the third control resource (CORESET No. 3). The configuration values ​​= N and K of the number of candidates for downlink control channels in the predetermined time unit (e.g., slot) are configured not to exceed the UE capacity.Furthermore, the configuration values ​​(= M+N, M+K and N+K) of the downlink control channel candidate numbers for a combination of the two sets of control resources are configured not to exceed UE capacity.

[083] According to the third aspect, as illustrated in Fig. 5, the configuration value (= M+N+K) of the number of candidates for downlink control channels for the combination of the three sets of control resources (CORESETs n° 1 and n° 3) are configured to exceed UE capacity. That is, the configuration of the number of candidates for downlink control channels in the predetermined time unit allows part of the configuration that exceeds UE capacity.

[084] According to the third aspect, when the number of candidates for downlink control channels exceeds the Petition 870200034103, dated 03 / 13 / 2020, page 35 / 91 27 / 69 UE capacity is configured, downlink control channel candidates from the selected control resource set based on the predetermined rule are monitored. That is, a specific control resource set is selected (or dropped) based on the predetermined rule and is monitored for the number of downlink control channel candidates equal to or less than the UE capacity. The rule for determining the control resource set can be defined by defaults and can be applied in a fixed manner. Alternatively, the rule can be notified to the UE by upper-layer signaling.

[085] A rule for determining a set of control features will be specifically described. (First rule)

[086] A set of control resources whose candidates for downlink control channels need to be monitored can be controlled in such a way that it is selected based on an index of the control resource set. The UE can select the control resource set from a smaller index from, for example, a plurality of control resource sets.

[087] For example, in a monitoring situation where three sets of control resources (CORESETs No. 1 and No. 3) overlap (see slots S1 and S13 in Fig. 3A), the number of candidates for downlink control channels (= M+N+K) exceeds the UE capacity and therefore control is performed to drop the first set of control resources CORESET No. 1 with the lowest index, so as not to monitor the first set of control resources CORESET No. 1 (see Fig. 5). Alternatively, in the monitoring situation (see slots S1 and S13 in Fig. 3A) where the three sets of control resources (CORESETs No. 1 and No. 3) overlap, the Petition 870200034103, dated 03 / 13 / 2020, page 36 / 91 28 / 69 The number of candidates for downlink control channels (= M+N+K) exceeds the UE capacity, and therefore the first set of CORESET control resources No. 1 with the lowest index is selected. The candidates for downlink control channels from the second and third sets of CORESET control resources No. 2 and No. 3 that were not selected are controlled in such a way that they are not monitored, and the number of blind decoding times decreases by the number of candidates for downlink control channels (N+K). The selection can be performed using not only the lowest index, but also an index determined according to the predetermined rule. (Second rule)

[088] A set of control resources whose downlink control channel candidates need to be monitored can be controlled so that it is selected based on an aggregation level of the downlink control channel candidates (search space). A UE can be configured to select the set of control resources in which a higher aggregation level is configured from a plurality of sets of control resources. Furthermore, the UE can be configured to select a control resource in which a higher aggregation level is configured in order within a range that does not exceed the UE's capacity.

[089] It is assumed, with respect to the three sets of CORESETs control resources no. 1 and no. 3 illustrated in Fig. 5, that the highest aggregation level is applied to CORESET no. 1 and the second highest aggregation level is applied to CORESET no. 2. In this case, the UE preferentially selects CORESET no. 1. Furthermore, provided that the UE capacity is not exceeded, CORESETs no. 1 and no. 2 are selected. Petition 870200034103, dated 03 / 13 / 2020, page 37 / 91 29 / 69

[090] Alternatively, the UE can be configured to select a control feature set in which a lower aggregation level is configured from a plurality of control feature sets. Additionally, the UE can be configured to select the control feature set to which a lower aggregation level is configured in order within the range that does not exceed the UE's capacity. (Third rule)

[091] A set of control resources whose downlink control channel candidates need to be monitored can be controlled so that a common UE control resource is selected first. Then, control can be performed to select a specific UE control resource set. In addition, the first or second rule above can be combined to select a set of control resources whose downlink control channel candidates need to be monitored.

[092] When the UE selects a set of control resources that needs to be monitored, it detects the DCIs based on the first, second, or third rule above, or a combination of these rules, in a monitoring instance with the configuration exceeding the UE's capacity, the UE performs a specified operation. For example, let's assume a case where blind decoding is performed in a monitoring instance of the selected control resource, and the DCIs for scheduling a PDSCH or a PUSCH are detected. In this case, the UE transmits HARQ-ACK for the PDSCH scheduled by the DCIs or transmits the PUSCH scheduled by the DCIs.

[093] Consequently, provided the UE capacity is not exceeded, the base station can easily scale a control channel per set of control resources, fixing the number of channel candidates. Petition 870200034103, dated 03 / 13 / 2020, pp. 38 / 91 30 / 69 downlink control by set of control resources. (Second Modality)

[094] According to the second mode, when a plurality of control resource sets is configured for a UE, a configuration value of the number of candidates for downlink control channels for each control resource set is controlled based on a control resource set in a predetermined time unit (e.g., slot), a search space, or the number of aggregation levels. <Primeiro Aspecto>

[095] According to the first aspect, the number of candidates for downlink control channels to be monitored in each control resource set changes according to the number of control resource sets configured in the predetermined time unit (e.g., slot).

[096] The configuration value of the number of candidates for downlink control channels for each set of control features is controlled so that, regardless of, for example, the number of sets of control features (or search spaces or aggregation levels) in the predetermined time unit, the number of candidates for downlink control channels (the number of times of blind decoding) is fixed.

[097] Fig. 6A illustrates three sets of control resources (CORESETs No. 1 and No. 3) with different monitoring periodicities. For example, the monitoring occasions of three sets of control resources (CORESETs No. 1 and No. 3) overlap in slot S1. Furthermore, the monitoring occasions of the first and second sets of control resources Petition 870200034103, dated 03 / 13 / 2020, pp. 39 / 91 31 / 69 (CORESETs #2 and #3) overlap in an S7 slot.

[098] Fig. 6B illustrates a configuration value and a maximum value of the number of candidates for downlink control channels (the number of blind decoding times) for all combinations of the three sets of control features (CORESETs No. 1 and No. 3). The maximum value of the number of candidates for downlink control channels (the number of blind decoding times) is configured as the same number (M+N+K) for each combination of the three sets of control features (CORESETs No. 1 and No. 3). The same number (M+N+K) as the maximum value is configured for the configuration value of the number of candidates for downlink control channels (the number of blind decoding times) for a single set of control features (CORESETs No. 1 and No. 3).

[099] On the other hand, in the case of a combination of the first set of control resources (CORESET No. 1) and the second set of control resources (CORESET No. 2), a configuration value (M+X) is configured for the first set of control resources (CORESET No. 1) and a configuration value (N+KX) is configured for the second set of control resources (CORESET No. 2), so that the total number of candidates for downlink control channels is the maximum value (M+N+K).

[0100] Similarly, in a case of combining the first set of control features (CORESET No. 1) and the third set of control features (CORESET No. 3), a configuration value (M+Y) is set for the first set of control features (CORESET No. 1) and a configuration value (K+NY) is set for the third set of control features (CORESET No. 3).

[0101] Furthermore, in a case of combining the second set of control features (CORESET No. 2) and the third set of features of Petition 870200034103, dated 03 / 13 / 2020, pp. 40 / 91 32 / 69 control (CORESET No. 3), the configuration value (N+Z) is configured for the second set of control features (CORESET No. 2), and the configuration value (K+MZ) is configured for the third set of control features (CORESET No. 3).

[0102] In the case of a combination of the first, second and third sets of control features (CORESETs No. 1 and No. 3), the configuration value (M) is set for the first set of control features (CORESET No. 1), the configuration value (N) is set for the second set of control features (CORESET No. 2) and the configuration value (K) is set for the third set of control features (CORESET No. 3).

[0103] Consequently, by blindly decoding a fixed number of candidates for downlink control channels, regardless of the control resource set configuration, it is possible to use a sufficient number of candidates, even when the number of control resource sets is small. Consequently, it is possible to decrease the probability of a situation (PDCCH blocking) where control channels for other terminals are allocated and control channels for other terminals are not allocated. <Segundo aspecto>

[0104] According to the second aspect, a configuration value of the number of candidates for downlink control channels (the number of blind decoding times) configured per control feature set is basically maintained regardless of the number of control feature sets (or search spaces or aggregation levels) on a monitoring occasion, a configuration value and a maximum value of the number of candidates for downlink control channels (the Petition 870200034103, dated 03 / 13 / 2020, pp. 41 / 91 33 / 69 (number of blind decoding times) are configured to become insufficient for a combination of control feature sets that exceed the UE's capacity.

[0105] Fig. 7 illustrates the configuration value and a maximum value for the number of candidates for downlink control channels (the number of blind decoding times) for all combinations of the three sets of control resources (CORESETs No. 1 and No. 3). The same configuration value (M+X) is configured for the first set of control resources (CORESET No. 1), even in the case of any combination, except combinations that exceed the UE capacity. M+X is configured for the maximum value of the number of candidates for downlink control channels (the number of blind decoding times) of the first set of control resources (CORESET No. 1).

[0106] The same configuration value (N+Y) is configured for the second set of control resources (CORESET No. 2), even in the case of any combination, except combinations that exceed the UE capacity, and N+Y is configured to the maximum number of candidates for downlink control channels (the number of blind decoding times) of the second set of control resources (CORESET No. 2). The same configuration value (K+Z) is configured for the third set of control resources (CORESET No. 3), even in the case of any combination, except combinations that exceed the UE capacity, and K+Z is configured to the maximum number of candidates for downlink control channels (the number of blind decoding times) of the third set of control resources (CORESET No. 3).

[0107] In addition, M+N+X+Y is set to the maximum number of candidates for downlink control channels (the number of times Petition 870200034103, dated 03 / 13 / 2020, pp. 42 / 91 34 / 69 blind decoding) for a combination of the first and second sets of control resources (CORESETs No. 1 and No. 2) and M+K+X+Z is configured to the maximum value of the number of candidates for downlink control channels for a combination of the first and third sets of control resources (CORESETs No. 1 and No. 3). The maximum value is configured for the second and third sets of control resources (CORESETs No. 2 and No. 3), also similarly to the above, as illustrated in Fig. 7.

[0108] Incidentally, simply adding the configuration values ​​(M+X, N+Y and K+X) configured to the first, second and third sets of control resources (CORESETs No. 1, No. 2 and No. 3), the number of candidates for downlink control channels (the number of times of blind decoding) exceeds the UE capacity.

[0109] Therefore, as illustrated in Fig. 7, a numerical value (M+N+K) from which X, Y, and Z are subtracted is set as the maximum value for the combination of the first, second, and third sets of control features (CORESETs No. 1, No. 2, and No. 3). Furthermore, the configuration value of the number of downlink control channel candidates (the number of times of blind decoding) for the first set of control features (CORESET No. 1) is set to M, and the configuration values ​​of the number of downlink control channel candidates for the second and third sets of control features (CORESETs No. 2 and No. 3) are set to N and K, respectively.

[0110] Furthermore, when a plurality of control feature sets is configured for the UE, the AL and the number of blind decoding times to be monitored in the control feature set may differ depending on the size of the control feature set. The size of the control feature set can be expressed by the number of units. Petition 870200034103, dated 03 / 13 / 2020, pp. 43 / 91 35 / 69 of resources included in the control resource unit (the number of resource units in the control resource set). (Radio Communication System)

[0111] The configuration of the radio communication system according to an embodiment of the present invention will be described below. This radio communication system uses one or a combination of the radio communication method according to each of the above embodiments of the present invention to perform the communication.

[0112] Fig. 8 is a diagram illustrating an example of a schematic configuration of the radiocommunication system according to an embodiment of the present invention. A radiocommunication system 1 may apply Carrier Aggregation (CA) and / or Dual Connectivity (DC) which aggregate a plurality of base frequency blocks (component carriers) whose unit is a system bandwidth (e.g., 20 MHz) of the LTE system.

[0113] In this sense, the radiocommunication system 1 can be referred to as Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), New Radio (NR), Future Radio Access (FRA) and New Radio Access Technology (New-RAT), or a system that implements these techniques.

[0114] The radio communication system 1 includes a base radio station 11, which forms a macro cell C1, with relatively wide coverage, and 12 base radio stations (12a to 12c), which are located within the macro cell C1 and form small cells C2, which are narrower than the macro cell C1. In addition, a user terminal 20 is located in the macro cell C1 and in each small cell C2. The arrangements and numbers of Petition 870200034103, dated 03 / 13 / 2020, pp. 44 / 91 36 / 69 respective cells and user terminals 20 are not limited to those illustrated in Fig. 8.

[0115] User terminal 20 can connect to both base radio station 11 and base radio stations 12. It is assumed that user terminal 20 simultaneously uses macro cell C1 and small cells C2 through the use of AC or DC. Furthermore, user terminal 20 can apply AC or DC through the use of a plurality of cells (CCs) (e.g., five or fewer CCs, or six or more CCs).

[0116] User terminal 20 and base radio station 11 can communicate using a narrow-bandwidth carrier (also referred to as a legacy carrier) in a relatively low frequency band (e.g., 2 GHz). On the other hand, user terminal 20 and each base radio station 12 can use a wide-bandwidth carrier in a relatively high frequency band (e.g., 3.5 GHz or 5 GHz) or can use the same carrier as that used between user terminal 20 and base radio station 11. In this sense, the configuration of the frequency band used by each base radio station is not limited to this.

[0117] In addition, user terminal 20 can perform communication using Time Division Duplexing (TDD) and / or Frequency Division Duplexing (FDD) in each cell. Furthermore, a single numerology can be applied to each cell (carrier) or a plurality of different numerologies can be applied.

[0118] Base radio station 11 and each base radio station 12 (or the two base radio stations 12) can be configured to be connected via a wired connection (e.g., fiber optics compatible with a Common Public Radio Interface (CPRI) or an X2 interface) or via Petition 870200034103, dated 03 / 13 / 2020, pp. 45 / 91 37 / 69 of a radio connection.

[0119] Base radio station 11 and each base radio station 12 are each connected to a top station device 30 and connected to a core network 40 via the top station device 30. In this sense, the top station device 30 includes, for example, an access gateway device, a Radio Network Controller (RNC) and a Mobility Management Entity (MME), but is not limited to these. Furthermore, each base radio station 12 can be connected to the top station device 30 via base radio station 11.

[0120] In this sense, base radio station 11 is a base radio station that has relatively wide coverage and may be referred to as a macro base station, an aggregate node, an eNodeB (eNB), or a transmit / receive point. Furthermore, each base radio station 12 is a base radio station that has local coverage and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, a domestic eNodeB (HeNB), a Remote Radio Header (RRH), or a transmit / receive point. Base radio stations 11 and 12 will be collectively referred to as base radio station 10 below when they are not distinguished.

[0121] Each user terminal 20 is a terminal that supports multiple communication schemes, such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station), but also a fixed communication terminal (fixed station).

[0122] Radio communication system 1 applies Orthogonal Frequency Division Multiple Access (OFDMA) to the downlink and applies Single Carrier Frequency Division Multiple Access (SC-FDMA) and / or OFDMA to the uplink as radio access schemes. Petition 870200034103, dated 03 / 13 / 2020, pp. 46 / 91 38 / 69

[0123] OFDMA is a multi-carrier transmission scheme that divides a frequency band into a plurality of narrow frequency bands (subcarriers) and maps data onto each subcarrier to perform communication. SC-FDMA is a single-carrier transmission scheme that divides a system bandwidth into a band including one or contiguous resource blocks per terminal and causes a plurality of terminals to use respectively different bands to reduce interference between terminals. In this sense, uplink and downlink radio access schemes are not limited to a combination of these, and other radio access schemes can be used for uplink and downlink radio access schemes.

[0124] Radio communication system 1 uses a shared downlink channel (PDSCH: Physical Downlink Shared Channel) shared through each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel) and an L1 / L2 downlink control channel as downlink channels. User data, upper layer control information and system information blocks (SIBs) are transmitted on the PDSCH. In addition, Master Information Blocks (MIBs) are transmitted on the PBCH.

[0125] The L1 / L2 downlink control channel includes a Physical Downlink Control Channel (PDCCH), an Enhanced Physical Downlink Control Channel (EPDCCH), a Physical Control Format Indicator Channel (PCFICH), and a Hybrid Physical ARQ Indicator Channel (PHICH). Downlink control information (DCI), including PDSCH and / or PUSCH scheduling information, is transmitted on the PDCCH.

[0126] Furthermore, escalation information can be notified Petition 870200034103, dated 03 / 13 / 2020, pp. 47 / 91 39 / 69 by DCI. For example, DCIs for scheduling the reception of DL data can be referred to as DL assignment, and DCIs for scheduling the transmission of UL data can be referred to as UL grant.

[0127] The number of OFDM symbols used for the PDCCH is transmitted in the PCFICH. Transmission acknowledgment information (also referred to as, for example, retransmission control information, HARQ-ACK or ACK / NACK) of a Hybrid Automatic Repeat Request for the PUSCH is transmitted in the PHICH. The EPDCCH undergoes frequency division multiplexing with the PDSCH (downlink shared data channel) and is used to transmit DCI similar to the PDCCH.

[0128] Radio communication system 1 uses a shared uplink channel (PUSCH: Physical Uplink Shared Channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel) and a random access channel (PRACH: Physical Random Access Channel) as uplink channels. User data and upper-layer control information are transmitted on the PUSCH. In addition, downlink radio quality information (CQI: Channel Quality Indicator), transmission acknowledgment information and scheduling request (SR) are transmitted on the PUCCH. A random access preamble to establish a connection with a cell is transmitted on the PRACH.

[0129] Radio communication system 1 transmits a Cell-Specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a Demodulation Reference Signal (DMRS), and a Positioning Reference Signal (PRS) as downlink reference signals. In addition, radio communication system 1 transmits Petition 870200034103, dated 03 / 13 / 2020, pp. 48 / 91 40 / 69 a Probing Reference Signal (SRS) and a Demodulation Reference Signal (DMRS) as uplink reference signals. In this sense, the DMRS can be referred to as a user terminal-specific reference signal (UE - User Terminal Specific Reference Signal). Furthermore, a reference signal to be transmitted is not limited to these. (Base Radio Station)

[0130] Fig. 9 is a diagram illustrating an example of a general configuration of a base radio station according to an embodiment of the present invention. A base radio station 10 includes pluralities of transmit / receive antennas 101, amplification sections 102 and transmit / receive sections 103, a baseband signal processing section 104, a call processing section 105 and a communication path interface 106. In this respect, the base radio station 10 only needs to be configured to include one or more of each of the transmit / receive antennas 101, amplification sections 102 and transmit / receive sections 103.

[0131] User data transmitted from base radio station 10 to a user terminal 20 in a downlink is introduced from the upstation device 30 to the baseband signal processing section 104, via the communication path interface 106.

[0132] The baseband signal processing section 104 performs Data Packet Convergence Protocol (PDCP) layer processing, segmentation and concatenation of user data, Radio Link Control (RLC) layer transmission processing such as RLC retransmission control, Medium Access Control (MAC) retransmission control (e.g., processing of Petition 870200034103, dated 03 / 13 / 2020, pp. 49 / 91 41 / 69 HARQ transmission) and transmission processing such as scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing and precoding processing on user data, and transfers user data to each transmission / reception section 103. In addition, the baseband signal processing section 104 performs transmission processing such as channel coding and inverse Fast Fourier Transform on a downlink control signal as well, and transfers the downlink control signal to each transmission / reception section 103.

[0133] Each transmission / reception section 103 converts a pre-encoded baseband signal emitted by an antenna from the baseband signal processing section 104 into a radio frequency band and transmits a radio frequency signal. The radio frequency signal undergoing frequency conversion through each transmission / reception section 103 is amplified through each amplification section 102 and is transmitted from each transmission / reception antenna 101. The transmission / reception sections 103 may be composed of transmitters / receivers, transmission / reception circuits, or transmission / reception apparatus described based on common knowledge in a technical field according to the present invention. In this sense, the transmission / reception sections 103 may be composed as an integrated transmission / reception section or may be composed of transmission sections and reception sections.

[0134] However, each amplification section 102 amplifies a radio frequency signal received at each transmit / receive antenna 101 as an uplink signal. Each transmit / receive section 103 receives the amplified uplink signal through each section of Petition 870200034103, dated 03 / 13 / 2020, pp. 50 / 91 42 / 69 amplification 102. Each transmission / reception section 103 performs frequency conversion on the received signal into a baseband signal and sends the baseband signal to the baseband signal processing section 104.

[0135] The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, MAC retransmission control reception processing, and the reception of an RLC layer and a PDCP layer in user data included in the uplink signal input and transfers the user data to the higher station device 30 via the communication path interface 106. The call processing section 105 performs call processing such as configuration and release of a communication channel, base radio station state management 10, and radio resource management.

[0136] The communication path interface 106 transmits and receives signals to and from the higher station unit 30 via a predetermined interface. In addition, the communication path interface 106 can transmit and receive signals (backhaul signaling) to and from the other base radio station 10 via an interbase station interface (e.g., fiber optics compliant with the Common Public Radio Interface (CPRI) or the X2 interface).

[0137] Each transmit / receive section 103 transmits a DL signal (e.g., downlink control information including a UL transmit instruction (e.g., a UL grant) and / or a HARQ-ACK transmit instruction or downlink data). Each Petition 870200034103, dated 03 / 13 / 2020, pp. 51 / 91 43 / 69 transmission / reception section 103 receives a staggered (or allocated) UL channel one period after receiving the DL signal and predetermined information (e.g., PHR and / or CSI) transmitted on the UL channel.

[0138] Each transmission / reception section 103 can receive as UE capacity information at least one of the following information related to HARQ-ACK processing time (N1) for DL ​​data (PDSCH), a processing time for UL data (N2), a processing time for PH (N3) and a processing time for CSI (N4).

[0139] Fig. 10 is a diagram illustrating an example of a base radio station function configuration according to an embodiment of the present invention. In addition, this example essentially illustrates function blocks of characteristic portions according to the present embodiment and it can be assumed that base radio station 10 includes other function blocks as well, which are necessary for radiocommunication.

[0140] The baseband signal processing section 104 includes at least one control (scheduler) section 301, a transmission signal generation section 302, a mapping section 303, a received signal processing section 304, and a measurement section 305. Furthermore, these components need only be included in the base radio station 10, and some or all of the components may not be included in the baseband signal processing section 104.

[0141] The control section (scheduler) 301 controls the entire base radio station 10. The control section 301 may consist of a controller, a control circuit, or a control apparatus described based on common knowledge in the technical field according to the present invention.

[0142] Control section 301 controls, for example, signal generation in the transmission signal generation section 302, and signal allocation in the section Petition 870200034103, dated 03 / 13 / 2020, pp. 52 / 91 44 / 69 mapping 303. In addition, control section 301 controls the signal reception processes in the received signal processing section 304, and the signal measurements in the measurement section 305.

[0143] Control section 301 controls the scheduling (e.g., resource allocation) of system information, a downlink data signal (e.g., a signal transmitted on the PDSCH) and a downlink control signal (e.g., a signal that is transmitted on the PDCCH and / or EPDCCH and is, for example, transmission acknowledgment information). Furthermore, control section 301 controls the generation of a downlink control signal and a downlink data signal based on a result obtained by deciding whether or not it is necessary to perform retransmission control on an uplink data signal. In addition, control section 301 controls the scheduling of synchronization signals (e.g., a Primary Synchronization Signal (PSS) / a Secondary Synchronization Signal (SSS)) and downlink reference signals (e.g., a CRS, a CSI-RS, and a DMRS).

[0144] In addition, control section 301 controls the scheduling of an uplink data signal (e.g., a signal transmitted on the PUSCH), an uplink control signal (e.g., a signal that is transmitted on the PUCCH and / or the PUSCH and is, for example, transmission acknowledgment information), a random access preamble (e.g., a signal transmitted on the PRACH), and an uplink reference signal.

[0145] Control section 301 controls UL data and / or HARQ-ACK transmission timings based on information notified from the UE (e.g., at least one piece of information related to the HARQ-ACK processing time (N1) for DL ​​data). Petition 870200034103, dated 03 / 13 / 2020, pp. 53 / 91 45 / 69 (PDSCH), UL data processing time (N2), PH processing time (N3) and CSI processing time (N4)).

[0146] In addition, control section 301 can configure for the UE a set of UE-specific upper-layer signaling control features. The configuration of the control feature sets can include a monitoring periodicity and a configuration value and a maximum value of the number of downlink control channel candidates (the number of times of blind decoding) (see Figs. 3B, 4, 5, 6B and 7).

[0147] Control section 301 requests the UE capacity (or specified capacity) related to the number of downlink control channel candidates (the number of blind decoding times) for the UE, sets a maximum value that does not exceed the UE capacity reported from the UE, to a combination of control resource sets, and allocates a configuration value to each control resource so that the configuration value does not exceed the maximum value (Fig. 3B). Thus, control section 301 can perform control so that the maximum value of the number of downlink control channel candidates (the number of blind decoding times) does not exceed the UE capacity in any combination of a plurality of control resource sets.Specifically, control section 301 ensures that the number of candidates for downlink control channels (the number of blind decoding times) does not exceed the UE capacity in a first-mode (first-aspect) case.

[0148] The transmission signal generation section 302 generates a downlink signal (such as a downlink control signal, a downlink data signal, or a downlink reference signal) based on an instruction from the control section 301 and Petition 870200034103, dated 03 / 13 / 2020, pp. 54 / 91 46 / 69 emits the downlink signal to mapping section 303. The transmission signal generated by section 302 may consist of a signal generator, a signal generator circuit, or a signal generator apparatus described based on common knowledge in the technical field according to the present invention.

[0149] The transmission signal generation section 302 generates, for example, a DL assignment to notify downlink data allocation information and / or a UL grant to notify uplink data allocation information based on the instruction from control section 301. The DL assignments and UL grants are both DCI, and conform to a DCI format. In addition, the transmission signal generation section 302 performs encoding processing and modulation processing on a downlink data signal according to a code rate and modulation scheme determined based on the Channel State Information (CSI) from each user terminal 20.

[0150] The mapping section 303 maps the downlink signal generated through the transmission signal generation section 302 to a predetermined radio resource based on the instructions of the control section 301 and transmits the downlink signal to each transmission / reception section 103. The mapping section 303 may consist of a mapper, a mapping circuit, or a mapping apparatus described based on common knowledge in the technical field according to the present invention.

[0151] The received signal processing section 304 performs reception processes (e.g., demapping, demodulation, and decoding) on ​​a received signal entered from each section of Petition 870200034103, dated 03 / 13 / 2020, pp. 55 / 91 47 / 69 transmission / reception 103. In this sense, the received signal is, for example, an uplink signal (such as an uplink control signal, an uplink data signal or an uplink reference signal) transmitted from the user terminal 20. The received signal processing section 304 may consist of a signal processor, a signal processing circuit or a signal processing apparatus described based on common knowledge in the technical field according to the present invention.

[0152] The received signal processing section 304 transmits information that is decoded through the receiving processes to the control section 301. When, for example, the PUCCH including a HARQACK is received, the received signal processing section 304 transmits the HARQ-ACK to the control section 301. In addition, the received signal processing section 304 transmits the received signal and / or the signal after reception processing to the measurement section 305.

[0153] Measurement section 305 performs the measurement related to the received signal. Measurement section 305 may consist of a measuring instrument, a measuring circuit, or a measuring apparatus described based on common knowledge in the technical field according to the present invention.

[0154] For example, measurement section 305 can perform Radio Resource Management (RRM) measurements or Channel State Information (CSI) measurements based on received signals. Measurement section 305 can measure received power (e.g., Received Reference Signal Power (RSRP)), received quality (e.g., Received Reference Signal Quality (RSRQ), Signal-to-Interference Ratio (SINR), Signal-to-Noise Ratio (SNR)), signal strength (e.g., Petition 870200034103, dated 03 / 13 / 2020, pp. 56 / 91 48 / 69 a Received Signal Strength and Indicator (RSSI) or channel information (e.g., CSI). Measurement section 305 can output a measurement result to control section 301. (User Terminal)

[0155] Fig. 11 is a diagram illustrating an example of a general configuration of the user terminal according to an embodiment of the present invention. The user terminal 20 includes pluralities of transmit / receive antennas 201, amplification sections 202 and transmit / receive sections 203, a baseband signal processing section 204 and an application section 205. In this sense, the user terminal 20 only needs to be configured to include one or more of each of the transmit / receive antennas 201, the amplification sections 202 and the transmit / receive sections 203.

[0156] Each amplification section 202 amplifies a radio frequency signal received at each transmit / receive antenna 201. Each transmit / receive section 203 receives a downlink signal amplified by each amplification section 202. Each transmit / receive section 203 performs frequency conversion on the received signal into a baseband signal and transmits the baseband signal to the baseband signal processing section 204. The transmit / receive sections 203 may be composed of transmitters / receivers, transmit / receive circuits, or transmit / receive apparatus described based on common technical field knowledge according to the present invention. In this sense, the transmit / receive sections 203 may be composed as an integrated transmit / receive section or may be composed of transmit sections and receive sections. Petition 870200034103, dated 03 / 13 / 2020, pp. 57 / 91 49 / 69

[0157] Baseband signal processing section 204 performs FFT processing, error correction decoding, and retransmission control reception processing on the incoming baseband signal. Baseband signal processing section 204 transfers downlink user data to application section 205. Application section 205 performs processing related to layers higher than a physical layer and a MAC layer. In addition, baseband signal processing section 204 can also transfer broadcast information from the downlink data to application section 205.

[0158] On the other hand, application section 205 inserts uplink user data into baseband signal processing section 204. Baseband signal processing section 204 performs retransmission control transmission processing (e.g., HARQ transmission processing), channel coding, pre-coding, Discrete Fourier Transform (DFT) processing, and IFFT processing on the uplink user data, and transfers the uplink user data to each transmit / receive section 203. Each transmit / receive section 203 converts the baseband signal emitted from baseband signal processing section 204 into a radio frequency band and transmits a radio frequency signal.The radio frequency signal subjected to frequency conversion by each transmission / reception section 203 is amplified by each amplification section 202 and is transmitted from each transmission / reception antenna 201.

[0159] Each transmit / receive section 203 receives a DL signal (e.g., downlink control information including a Petition 870200034103, dated 03 / 13 / 2020, pp. 58 / 91 50 / 69 UL transmission instruction (e.g., UL grant) and / or a HARQ-ACK transmission instruction and downlink data). Each transmit / receive section 203 transmits a scheduled (or allocated) UL channel in the first period after receiving the DL signal and predetermined information (e.g., PHR and / or CSI) using the UL channel.

[0160] Each 203 transmission / reception section can transmit as UE capacity information at least one of the following information related to HAQR-ACK processing time (N1) for DL ​​data (PDSCH), UL data processing time (N2), PH processing time (N3) and CSI processing time (N4).

[0161] Fig. 12 is a diagram illustrating an example of a user terminal function configuration according to an embodiment of the present invention. In addition, this example mainly illustrates function blocks of characteristic portions according to the present embodiment and it can be assumed that the user terminal 20 includes other function blocks as well, which are necessary for radiocommunication.

[0162] The baseband signal processing section 204 of the user terminal 20 includes at least one control section 401, one transmission signal generation section 402, one mapping section 403, one received signal processing section 404, and one measurement section 405. Furthermore, these components need only be included in the user terminal 20, and some or all of the components may not be included in the baseband signal processing section 204.

[0163] Control section 401 controls the entire user terminal 20. Control section 401 may consist of a controller, a control circuit, or a control apparatus described based on common knowledge in the technical field according to the present invention. Petition 870200034103, dated 03 / 13 / 2020, pp. 59 / 91 51 / 69

[0164] Control section 401 controls, for example, signal generation in the transmission signal generation section 402, and signal allocation in the mapping section 403. In addition, control section 401 controls signal reception processes in the received signal processing section 404, and signal measurements in the measurement section 405.

[0165] Control section 401 obtains from received signal processing section 404 a downlink control signal and a downlink data signal transmitted from base radio station 10. Control section 401 controls the generation of an uplink control signal and / or an uplink data signal based on a result obtained by deciding whether or not it is necessary to perform retransmission control on the downlink control signal and / or the downlink data signal.

[0166] Control section 401 can control a setting of a control feature set by UE-specific upper-layer signaling. For example, control section 401 controls the setting of the control feature set for which the maximum value and setting value shown in Figs. 3B, 4, 5, 6B, or 7 have been set.

[0167] Control section 401 specifies a monitoring occasion based on the monitoring periodicity by control feature set (CORESETs No. 1 and No. 3) and controls the number of blind decoding times, so that the number of blind decoding times does not exceed the maximum value configured by the combination of the control feature set (first mode).

[0168] In addition, control section 401 performs control in such a way as not to monitor some or all of the candidates for downlink control channels when the number of candidates for downlink control channels is Petition 870200034103, dated 03 / 13 / 2020, pp. 60-91 52 / 69 The number of downlink control channels that need to be monitored in a predetermined time unit (e.g., slot) exceeds the predetermined value (the second aspect of the first mode). Furthermore, the 401 control section can select some of the downlink control channel candidates to be monitored based on predetermined conditions when the number of downlink control channel candidates that need to be monitored in the predetermined time unit (e.g., slot) exceeds the predetermined value (the third aspect of the first mode). Additionally, the 401 control section changes the number of downlink control channel candidates to be monitored in each control resource set according to the number of control resource sets configured in the predetermined time unit (e.g., slot) (the first aspect of the second mode).Furthermore, the 401 control section performs control to make the configuration value and the maximum value of the number of candidates for downlink control channels (the number of blind decoding times) smaller for the combination of control resource sets that exceed the UE capacity (the second aspect of the second mode).

[0169] The transmission signal generation section 402 generates an uplink signal (such as an uplink control signal, an uplink data signal, or an uplink reference signal) based on an instruction from the control section 401 and transmits the uplink signal to the mapping section 403. The transmission signal generated by section 402 may consist of a signal generator, a signal generator circuit, or a signal generator apparatus described based on common knowledge in the technical field according to the present invention. Petition 870200034103, dated 03 / 13 / 2020, pp. 61 / 91 53 / 69

[0170] The transmit signal generated by section 402 generates an uplink control signal related to transmit acknowledgment information and Channel State Information (CSI) based, for example, on instructions from control section 401. Additionally, the transmit signal generation section 402 generates an uplink data signal based on instructions from control section 401. When, for example, the downlink control signal reported from base station 10 includes a UL grant, the transmit signal generation section 402 is instructed via control section 401 to generate an uplink data signal.

[0171] The mapping section 403 maps the uplink signal generated through the transmission signal generation section 402 to a radio resource based on the instruction from the control section 401 and transmits the uplink signal to each transmission / reception section 203. The mapping section 403 may consist of a mapper, a mapping circuit, or a mapping apparatus described based on common knowledge in the technical field according to the present invention.

[0172] The received signal processing section 404 performs reception processes (e.g., demapping, demodulation, and decoding) on ​​the input of the received signal from each transmission / reception section 203. In this sense, the received signal is, for example, a downlink signal (such as a downlink control signal, a downlink data signal, or a downlink reference signal) transmitted from the base radio station 10. The received signal processing section 404 may consist of a signal processor, a signal processing circuit, or a signal processing apparatus described based on the knowledge Petition 870200034103, dated 03 / 13 / 2020, pp. 62 / 91 54 / 69 common in the technical field according to the present invention. Furthermore, the received signal processing section 404 can comprise the receiving section according to the present invention.

[0173] The received signal processing section 404 transmits information that is decoded through the receiving processes to the control section 401. The received signal processing section 404 transmits, for example, broadcast information, system information, RRC and DCI signaling to the control section 401. In addition, the received signal processing section 404 transmits the received signal and the signal after reception processing to the measurement section 405.

[0174] Measurement section 405 performs the measurement related to the received signal. Measurement section 405 may consist of a measuring instrument, a measuring circuit, or a measuring apparatus described based on common knowledge in the technical field according to the present invention.

[0175] For example, measurement section 405 can perform RRM measurements or CSI measurements based on received signals. Measurement section 405 can measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, or SNR), signal strength (e.g., RSSI), or channel information (e.g., CSI). Measurement section 405 can output a measurement result to control section 401. (Hardware configuration)

[0176] Furthermore, the block diagrams used to describe the above embodiments illustrate blocks in functional units. These function blocks (components) are realized through an optional combination of hardware and / or software. In addition, a method for realizing each block of Petition 870200034103, dated 03 / 13 / 2020, pp. 63 / 91 55 / 69 function is not limited in particular. That is, each functional block can be made by using a physically or logically coupled device or it can be made by using a plurality of these devices formed by connecting two or more physically and / or logically separate devices, directly and / or indirectly (by using, for example, a cable connection and / or a radio connection).

[0177] For example, the base radio station and the user terminal according to an embodiment of the present invention can function as computers that perform the processing of the radio communication method according to the present invention. Fig. 13 is a diagram illustrating an example of hardware configurations of the base radio station and the user terminal according to an embodiment of the present invention. The base radio station 10 above and the user terminal 20 can each be physically configured as a computer apparatus, which includes a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006 and a bus 1007.

[0178] In this sense, a word apparatus in the following description can be read as a circuit, a device, or a unit. The hardware configurations of base radio station 10 and user terminal 20 can be configured to include one or a plurality of apparatus illustrated in Fig. 13 or can be configured without including some of the apparatus.

[0179] For example, Fig. 13 illustrates the single processor 1001. However, there may be a plurality of processors. Furthermore, processing may be performed by one processor or it may be performed by one or more processors simultaneously, successively, or by using another method. Moreover, the processor Petition 870200034103, dated 03 / 13 / 2020, pp. 64 / 91 56 / 69 1001 can be implemented using one or more chips.

[0180] Each function of the base radio station 10 and the user terminal 20 is performed, for example, by causing a hardware such as the processor 1001 and the memory 1002 to read a predetermined software (program) and thus causing the processor 1001 to perform an operation and communication control via communication device 1004 and reading and / or writing of data in memory 1002 and storage 1003.

[0181] Processor 1001 causes, for example, an operating system to operate in order to control the entire computer. Processor 1001 may consist of a Central Processing Unit (CPU), including an interface for a peripheral device, a control device, an operating device, and a register. For example, the baseband signal processing section 104 (204) and the call processing section 105 above may be performed by processor 1001.

[0182] In addition, the processor 1001 reads programs (program codes), a software module, or data from storage 1003 and / or communication devices 1004 outside of memory 1002, and performs various types of processing according to these programs, the software module, or the data. As for programs, programs are used that cause the computer to perform at least part of the operations described in the modalities above. For example, the control section 401 of the user terminal 20 can be performed through a control program stored in memory 1002 and operating on the processor 1001, and other functional blocks can also be performed in the same way.

[0183] Memory 1002 is a recording medium that can be read by a computer and can be composed of at least one of, for example, Petition 870200034103, dated 03 / 13 / 2020, pp. 65 / 91 57 / 69 a Read-Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable EPROM (EEPROM), a Random Access Memory (RAM) and other suitable storage media. Memory 1002 may be referred to as a register, a cache or a main memory (main storage device). Memory 1002 may store programs (program codes) and a software module that may be executed to develop the radio communication method according to an embodiment of the present invention.

[0184] Storage 1003 is a computer-readable recording medium that may consist of at least one of, for example, a floppy disk, a floppy disk (trademark), a magneto-optical disk (for example, a compact disc (CD-ROM), a digital versatile disk and a Blu-ray disc (trademark)), a removable disk, a hard disk drive, a smartcard, a flash memory device (for example, a card, a stick or a key drive), a magnetic stripe, a database, a server and other suitable storage media. Storage 1003 may be referred to as an auxiliary storage device.

[0185] The 1004 communication device is a hardware (transmission / reception device) that performs communication between computers via a cable and / or radio network and is also referred to as, for example, a network device, a network controller, a network card, and a communication module. The 1004 communication device can be configured to include a high-frequency switch, a duplexer, a filter, and a frequency synthesizer to perform, for example, Frequency Division Duplexing (FDD) and / or Time Division Duplexing (TDD). For example, the 101 (201) transmission / reception antennas, sections of Petition 870200034103, dated 03 / 13 / 2020, pp. 66 / 91 58 / 69 amplification 102 (202), transmission / reception sections 103 (203) and communication path interface 106 above can be performed by communication apparatus 1004.

[0186] Input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, or a sensor) that accepts an input from outside. Output device 1006 is an output device (e.g., a display, a speaker, or a Light Emitting Diode (LED) lamp) that sends an output to the outside. Furthermore, input device 1005 and output device 1006 may be an integrated component (e.g., a touch panel).

[0187] In addition, each device such as processor 1001 or memory 1002 is connected by bus 1007 which communicates information. Bus 1007 can be composed using a single bus or it can be composed using buses that are different between devices.

[0188] In addition, base radio station 10 and user terminal 20 can be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field-Programmable Gate Array (FPGA). The hardware can be used to perform some or all of the function blocks. For example, processor 1001 can be implemented using at least one of these hardware types. (Modified example)

[0189] In addition, each term described in this description and / or each term necessary to understand this description may be replaced by terms with identical or similar meanings. For example, a channel and / or a symbol may be signals (signaling). In addition, a signal may be a message. A reference signal may also be abbreviated as a Petition 870200034103, dated 03 / 13 / 2020, pp. 67 / 91 59 / 69 RS (Reference Signal), or it can also be referred to as a pilot or a pilot signal, depending on the standards to be applied. Additionally, a Component Carrier (CC) can be referred to as a cell, a frequency carrier, and a carrier frequency.

[0190] In addition, a radio frame may include one or a plurality of periods (frames) in a time domain. Each one or a plurality of periods (frames) that make up a radio frame may be referred to as a subframe. In addition, the subframe may include one or a plurality of slots in the time domain. A subframe may be a fixed time duration (e.g., one ms) that is not dependent on numerologies.

[0191] In addition, the slot may include one or a plurality of symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SCFDMA) symbols) in the time domain. In addition, the slot may be a unit of time based on numerologies. In addition, the slot may include a plurality of minislots. Each minislot may include one or a plurality of symbols in the time domain. In addition, the minislot may be referred to as a subslot.

[0192] The radio frame, subframe, slot, minislot, and symbol each indicate a unit of time for signal transmission. Other corresponding names may be used for the radio frame, subframe, slot, minislot, and symbol. For example, a subframe may be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may be referred to as TTIs, or a slot or minislot may be referred to as a TTI. That is, the subframe and / or TTI may be a subframe (one ms) according to legacy LTE, it may be a Petition 870200034103, dated 03 / 13 / 2020, pp. 68 / 91 60 / 69 period (e.g., 1 to 13 symbols) shorter than one ms or can be a period longer than one ms. Furthermore, a unit indicating the TTI may be referred to as a slot or a minislot instead of a subframe.

[0193] In this sense, TTI refers to, for example, a minimum time-scheduling unit for radiocommunication. For example, in LTE systems, the base radio station performs the scheduling for the allocation of radio resources (a frequency bandwidth or transmission power that can be used by each user terminal) in TTI units for each user terminal. In this sense, a definition of TTI is not limited to this.

[0194] The TTI can be a transmission time unit of a channel-encoded data packet (transport block), code block and / or codeword, or it can be a link scheduling or adaptation processing unit. Furthermore, when the TTI is given, a time interval (e.g., the number of symbols) in which a transport block, code block and / or codeword are actually mapped may be less than the TTI.

[0195] Furthermore, when a slot or a minislot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be a minimum time-scheduling unit. In addition, the number of slots (the number of minislots) to compose a minimum time-scheduling unit may be controlled.

[0196] A TTI with a duration of one ms may be referred to as an overall TTI (TTIs according to LTE Rel. 8 to 12), a normal TTI, a long TTI, an overall subframe, a normal subframe, or a long subframe. A TTI shorter than the overall TTI may be referred to as a reduced TTI, a short TTI, a partial or fractional TTI, a reduced subframe, a short subframe, a Petition 870200034103, dated 03 / 13 / 2020, pp. 69 / 91 61 / 69 minislot or a subslot.

[0197] Furthermore, the long TTI (e.g., overall TTI or subframe) can be read as a TTI with a time duration exceeding one ms, and the short TTI (e.g., reduced TTI) can be read as a TTI with a TTI length less than the length of the long TTI and equal to or greater than 1 ms.

[0198] Resource blocks (RBs) are units of resource allocation in the time domain and frequency domain and may include one or a plurality of consecutive subcarriers in the frequency domain. In addition, the RB may include one or a plurality of symbols in the time domain or may have the length of a slot, a minislot, a subframe, or a TTI. A TTI or a subframe may each be composed of one or a plurality of resource blocks. In this respect, one or a plurality of RBs may be referred to as a Physical Resource Block (PRB), a Subcarrier Group (SCG), a Resource Element Group (REG), a PRB pair, or an RB pair.

[0199] In addition, the feature block may be composed of one or a plurality of Feature Elements (REs). For example, an RE may be a radio feature domain of a subcarrier and a symbol.

[0200] In this sense, the radio frame, subframe, slot, minislot, and symbol structures above are only exemplary structures. For example, configurations such as the number of subframes included in a radio frame, the number of slots included per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, a symbol length, and a cyclic prefix (CP) length can be changed in various ways. Petition 870200034103, dated 03 / 13 / 2020, pp. 70 / 91 62 / 69

[0201] In addition, the information and parameters described in this description may be expressed using absolute values, may be expressed using relative values ​​in relation to predetermined values, or may be expressed using other corresponding information. For example, a radio feature may be instructed by a predetermined index.

[0202] The names used for parameters in this description are by no means restrictive names. For example, several channels (the Physical Uplink Control Channel (PUCCH) and the Physical Downlink Control Channel (PDCCH)) and information elements can be identified based on several suitable names. Therefore, the various names assigned to these various channels and information elements are by no means restrictive names.

[0203] The information and signals described in this description may be expressed through the use of one of several different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the description above may be expressed as voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or optional combinations thereof.

[0204] Furthermore, information and signals can be transmitted from an upper layer to a lower layer and / or from a lower layer to an upper layer. Information and signals can be inserted or transmitted via a plurality of network nodes.

[0205] Input and output information and signals can be stored in a specific location (e.g., memory) or can be managed using a management table. The information and Petition 870200034103, dated 03 / 13 / 2020, pp. 71 / 91 63 / 69 Input and output signals can be overwritten, updated, or additionally written. Input information and signals can be deleted. Input information and signals can be transmitted to other devices.

[0206] Information notification is not limited to the aspects / modalities described in this description and may be performed using other methods. For example, information may be notified through physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), upper layer signaling (e.g., Radio Resource Control (RRC) signaling), broadcast information (Master Information Blocks (MIBs) and System Information Blocks (SIBs)), and Medium Access Control (MAC) signaling), and other signals or combinations thereof.

[0207] Furthermore, physical layer signaling can be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signal). Additionally, RRC signaling can be referred to as an RRC message and can be, for example, an RRC connection configuration message or an RRC connection reconfiguration message. Furthermore, MAC signaling can be notified by the use of, for example, a MAC Control Element (MAC CE).

[0208] Furthermore, notification of predetermined information (e.g., notification of being X) can be done not only explicitly, but also implicitly (e.g., by not notifying this predetermined information or by notifying other information).

[0209] The decision can be made based on a value (0 or 1) expressed by a bit, or it can be made based on a boolean expressed through Petition 870200034103, dated 03 / 13 / 2020, pp. 72 / 91 64 / 69 true or false, or it can be done by comparing numerical values ​​(for example, comparison with a predetermined value).

[0210] Regardless of whether software is referred to as software, firmware, middleware, microcode, or a hardware description language, or by other names, software should be broadly understood as a command, a set of commands, code, a code segment, program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, an execution fiber, a procedure, or a function.

[0211] In addition, software, commands, and information can be transmitted and received via transmission media. When, for example, software is transmitted from websites, servers, or other remote sources through the use of wired techniques (e.g., coaxial cables, fiber optic cables, twisted pairs, and Digital Subscriber Lines (DSL)) and / or radio techniques (e.g., infrared and microwaves), these wired and / or radio techniques are included in a definition of transmission media.

[0212] The terms system and network used in this description are used interchangeably.

[0213] In this description, the terms Base Station (BS), base radio station, eNB, gNB, cell, sector, cell group, carrier and component carrier may be used interchangeably. The base station is also referred to by a term such as a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmit point, a receive point, a femtocell or a small cell in some cases. Petition 870200034103, dated 03 / 13 / 2020, pp. 73 / 91 65 / 69

[0214] The base station may accommodate one or a plurality of (e.g., three) cells (also referred to as sectors). When the base station accommodates a plurality of cells, an entire coverage area of ​​the base station may be partitioned into a plurality of smaller areas. Each smaller area may provide communication service via a base station subsystem (e.g., small indoor base station (RRH: Remote Radio Header)). The term cell or sector indicates a portion or the entirety of the coverage area of ​​the base station and / or the base station subsystem that provides communication services within that coverage.

[0215] In this description, the terms Mobile Station (MS), user terminal, User Equipment (UE) and terminal may be used interchangeably. The base station is also referred to by a term such as a fixed station, a NodeB, an eNodeB (eNB), an access point, a transmit point, a receive point, a femtocell or a small cell in some cases.

[0216] A mobile station is also referred to by a person skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term in some cases.

[0217] Furthermore, the base radio station in this description can be read as the user terminal. For example, each aspect / embodiment of the present invention can be applied to a configuration where communication between the base radio station and the user terminal is replaced by Petition 870200034103, dated 03 / 13 / 2020, pp. 74 / 91 66 / 69 communication between a plurality of user terminals (D2D: Device to Device). In this case, user terminal 20 can be configured to include the functions of base radio station 10 above. Furthermore, words like "uplink" and "downlink" can be read as "sides." For example, the uplink channel can be read as a side channel.

[0218] Similarly, the user terminal in this descriptive report can be read as the base radio station. In this case, base radio station 10 can be configured to include the functions of user terminal 20 above.

[0219] In this description, the operations performed by the base station are performed by a superior node of this base station, depending on the case. Obviously, in a network including one or a plurality of network nodes including base stations, various operations performed to communicate with a terminal may be performed by base stations or one or more network nodes (which should be, for example, Mobility Management Entities (MMEs) or Server Gateways (S-GWs), however they are not limited to these) in addition to the base stations or a combination thereof.

[0220] Each aspect / modality described in this description can be used alone, can be used in combination, or can be exchanged and used when developed. Furthermore, the order of processing procedures, sequences, and flowcharts according to each aspect / modality described in this descriptive report can be rearranged unless contradictions arise. For example, the method described in this description presents several step elements in an exemplary order and is not limited to the specific order presented.

[0221] Each aspect / modality described in this descriptive report may Petition 870200034103, dated 03 / 13 / 2020, pp. 75 / 91 67 / 69 shall be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, the 4th generation mobile communication system (4G), the 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio Access Technology (New-RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM) (trademark), CDMA 2000, Ultra Wideband Mobile (UMB), IEEE 802.11 (Wi-Fi (trademark)), IEEE 802.16 (WiMAX (trademark)), IEEE 802.20, Ultra Wideband (UWB), Bluetooth (trademark), systems using other suitable radiocommunication methods and / or next-generation systems that are expanded upon these systems.

[0222] The phrase "based on" used in this descriptive report does not mean "based solely on," unless otherwise specified. In other words, the phrase "based on" means both "based only on" and "based on at least."

[0223] Each reference to elements using names such as first and second used in this descriptive report generally does not limit the quantity or order of those elements. These names may be used in this descriptive report as a convenient method of distinguishing between two or more elements. Consequently, the reference to first and second elements does not mean that only two elements may be employed or that the first element must precede the second element in any way.

[0224] The term deciding (determining) used in this descriptive report includes several operations in some cases. For example, deciding (determining) can be considered to determine, calculate, compute, process, derive, investigate, search (e.g., search in). Petition 870200034103, dated 03 / 13 / 2020, pp. 76 / 91 68 / 69 a table, in a database or other data structure) and determine. Furthermore, deciding (determining) can be considered to mean "determining" to receive (e.g., receiving information), transmit (e.g., transmitting information), input, output, and access (e.g., accessing data in memory). Additionally, deciding (determining) can be considered to mean "determining" to resolve, select, choose, establish, and compare. That is, deciding (determining) can be considered to mean deciding (determining) some operation.

[0225] The words connected and coupled used in this descriptive report or any modification of these words may mean any direct or indirect connection or coupling between two or more elements, and may include that one or more intermediate elements exist between the two elements connected or coupled to each other. Elements may be coupled or connected physically, logically, or through a combination of physical and logical connections. For example, connection may be read as access.

[0226] It is understood that, when connected in this descriptive report, the two elements are connected or coupled to each other through the use of one or more electrical wires, cables and / or printed electrical connection and through the use of electromagnetic energy with wavelengths in radio frequency domains, microwave domains and light domains (both visible and invisible) in some non-restrictive and incomprehensible examples.

[0227] A sentence in which A and B are different in this description can mean that A and B are different from each other. Words like separate and coupled can also be interpreted similarly.

[0228] When the words including and comprising and Petition 870200034103, dated 03 / 13 / 2020, pp. 77 / 91 69 / 69 modifications of these words are used in this descriptive report or in the claims; these words are intended to be comprehensively similar to the word "having." Furthermore, the word "or" used in this descriptive report or in the claims is not intended to be an exclusive OR.

[0229] The present invention has been described in detail above. However, it is obvious to a person skilled in the art that the present invention is not limited to the embodiments described in this descriptive report. The present invention can be developed with modified and altered aspects without departing from the essence and scope of the present invention as defined by the recitation of the claims. Thus, the invention in this descriptive report is intended to be an exemplary explanation and does not have any restrictive meaning for the present invention. Petition 870200034103, dated 03 / 13 / 2020, pp. 78 / 91

Claims

1 / 2 CLAIMS 1. Terminal (20) characterized in that it comprises: a receiving section (203) configured to receive a downlink control channel transmitted by each of a plurality of sets of search spaces; and a control section (401) configured to control the monitoring of a candidate downlink control channel;wherein the control section (401) is configured to allocate a number of downlink control channel candidates for each search space set, such that the number of downlink control channel candidates to be monitored within a slot does not exceed a maximum value for a combination of the search space sets configured within the slot, and wherein the control section (401) first determines a number of downlink control channel candidates in a common search space and then determines a number of downlink control channel candidates in a user-specific search space, and the number of downlink control channel candidates in the user-specific search space is determined in ascending order of a search space set index.

2. Radio communication method for a terminal (20) characterized in that it comprises: receiving a downlink control channel transmitted by each of a plurality of sets of research spaces; and controlling the monitoring of a candidate downlink control channel; and Petition 870240065959, dated 05 / 08 / 2024, p.12 / 13 2 / 2 allocate a number of downlink control channel candidates to each search space set, such that the number of downlink control channel candidates to be monitored within a slot does not exceed a maximum value for a combination of the search space sets configured within the slot, and wherein the method further comprises first determining a number of downlink control channel candidates in a common search space and then determining a number of downlink control channel candidates in a user-specific search space, and the number of downlink control channel candidates in the user-specific search space is determined in ascending order of a search space set index. Petition 870240065959, dated 05 / 08 / 2024, p. 13 / 13.

Images