Terminal, radio communication method and base station

Abstract

A user terminal according to the present invention includes: a transmission section that transmits uplink control (UCI) information using an uplink control channel of a first duration and / or an uplink control channel of a second duration longer than the first duration; a reception section that receives fallback-related information from the uplink control channel; and a control section that controls the shape of the uplink control channel to be used to transmit the UCI, based on fallback-related information.

Description

1 / 56 TERMINAL, RADIO COMMUNICATION METHOD AND BASE STATION Technical field

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

[002] In the UMTS (Universal Mobile Telecommunications System) network, the Long Term Evolution (LTE) specifications were developed with the aim of further increasing high-speed data rates, providing lower latency and so on (see Non-Patent Literature 1). In addition, LTE successor systems are also being studied with the aim of achieving greater broadbandization and increased speed beyond LTE (referred to as, for example, LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G+ (plus), “NR (New RAT), LTE Rel. 14, LTE Rel. 15 (or later versions) and so on).

[003] In existing LTE systems (e.g., LTE Rel. 8 to Rel. 13), downlink (DL) and / or uplink (UL) communications are performed using 1 ms subframes (referred to as, for example, transmission time intervals (TTIs)). This subframe is the time unit for the transmission of a channel-encoded data packet, and is the processing unit in, for example, scheduling, link adaptation, retransmission control (HARQ (hybrid automatic repeat request)), and so on.

[004] In existing LTE systems (e.g., LTE Rel. 8 to Rel. 13), a user terminal transmits uplink control (UCI) information using a UL control channel (e.g., PUCCH (Channel of Petition 870200126267, dated 06 / 10 / 2020, page 8 / 68 2 / 56 Physical Uplink Control) or UL data channel (e.g., PUSCH (Physical Uplink Shared Channel)). A structure (format) of the UL control channel is also referred to, for example, as a “PUCCH format”. List of Citations Non-Patented Literature 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

[005] In future radiocommunication systems (e.g., LTE Rel. 14, Rel. 15 or later versions, 5G, NR and so on), it is assumed that they will transmit UCI using UL control channels with configurations (formats) different from those of existing LTE systems (e.g., LTE Rel. 13 or earlier versions).

[006] For example, for future radiocommunication systems, a study is underway to provide support for a UL control channel with a first duration (e.g., one to two symbols) that is relatively short (also called short PUCCH and so on), and a UL control channel with a second duration (e.g., 4 to 14 symbols) that is longer than the first duration (hereinafter also referred to as long PUCCH and so on).

[007] In addition, for future radio communication systems, a study is underway to support, for each short PUCCH and long PUCCH, one or more formats (also called configuration, format of Petition 870200126267, dated 06 / 10 / 2020, p. 9 / 68 3 / 56 PUCCH (PF) or similar) having different numbers of ICU bits that can be transmitted.

[008] As described above, among a plurality of PUCCH formats with different durations and / or numbers of bits that can be transmitted, different coverage is assumed. Consequently, as a result of an appropriate PUCCH format not being applied to a user terminal (a UE with limited coverage) whose coverage is limited to a certain range, the quality of the UL control channel may deteriorate.

[009] The present invention was made in view of the above, and it is therefore an object of the present invention to provide a user terminal and a radio communication method capable of preventing the deterioration of the quality of a UL control channel when a plurality of PUCCH formats having different durations and / or numbers of bits that can be transmitted are supported. Solution to the Problem

[010] One aspect of a user terminal according to the present invention includes: a transmission section that transmits uplink control (UCI) information using an uplink control channel of a first duration and / or an uplink control channel of a second duration longer than the first duration; a reception section that receives fallback-related information from the uplink control channel; and a control section that controls a format of the uplink control channel to be used to transmit the UCI, based on the fallback-related information. Advantageous Effects of the Invention Petition 870200126267, dated 06 / 10 / 2020, page 10 / 68 4 / 56

[011] According to the present invention, it is possible to avoid the deterioration of the quality of a UL control channel when a plurality of PUCCH formats with different durations and / or number of bits that can be transmitted are supported. Brief Description of the Figures

[012] FIGS. 1A and 1B are diagrams to show examples of UL control channel configuration; FIG. 2 is a diagram to show an example of PUCCH formats in the future radio communication system; Figures 3A and 3B are diagrams to show examples of upper-layer control information according to a second aspect; Figures 4A and 4B are diagrams to show examples of PUCCH's first resource allocation according to a third aspect; FIG. 5 is a diagram to show an example of PUCCH's second resource allocation according to the third aspect; FIG. 6 is a diagram to show another example of PUCCH's second resource allocation according to the third aspect; FIG. 7 is a diagram to show an example of a schematic structure of a radiocommunication system according to the present embodiment; FIG. 8 is a diagram to show an example of a general structure of the radio base station according to the present embodiment; FIG. 9 is a diagram to show an example of a functional structure of a radio base station according to the present embodiment. FIG. 10 is a diagram to show an example of a general structure of a user terminal according to the present embodiment. Petition 870200126267, dated 06 / 10 / 2020, page 11 / 68 5 / 56 FIG. 11 is a diagram to show an example of a functional structure of a user terminal according to the present embodiment; and FIG. 12 is a diagram to show an example of the hardware structure of a base radio station and a user terminal according to the present embodiment. Description of the Modalities

[013] For future radiocommunication systems (e.g., LTE Rel. 15 or later versions, 5G, NR and so on), a configuration (also referred to as a format, a PUCCH format (PF) or similar) for a UL control channel (e.g., a PUCCH) used for UTI transmission is under study.

[014] FIGS. 1A and 1B are diagrams illustrating an example of a PUCCH in a future radiocommunication system. FIG. 1A shows a PUCCH (a short PUCCH) consisting of a relatively small number of symbols (duration, for example, of one to two symbols). FIG. 1B shows a PUCCH (a long PUCCH) consisting of a larger number of symbols (duration, for example, of 4 to 14 symbols) than the short PUCCH.

[015] As shown in FIG. 1A, the short PUCCH can be mapped to a certain number of symbols (e.g., one to two symbols) from the end of a slot. It is worth noting that the symbols to which the short PUCCH is mapped are not limited to those at the end of the slot, but can be a certain number of symbols at the beginning or in the middle of the slot. The short PUCCH is mapped to one or more frequency features (e.g., one or more physical feature blocks (PRBs)). It is worth noting that in FIG. 1A, it is assumed that the short PUCCH is mapped to consecutive PRBs, but the short PUCCH can be mapped to non-consecutive PRBs. Petition 870200126267, dated 06 / 10 / 2020, page 12 / 68 6 / 56

[016] The short PUCCH can be subjected to TDM and / or FDM with a UL data channel (also referred to below as PUSCH) in the slot. Furthermore, the short PUCCH can be subjected to time division multiplexing and / or frequency division multiplexing with a DL data channel (hereinafter also referred to as PDSCH) and / or a DL control channel (hereinafter also referred to as “PDCCH (Physical Downlink Control Channel)”) in the slot.

[017] The short PUCCH can use a multicarrier waveform (e.g., an OFDM (orthogonal frequency division multiplexing) waveform) or it can use a single carrier waveform (e.g., a DFT-s-OFDM (Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing)).

[018] Meanwhile, as shown in FIG. 1B, the long PUCCH is mapped over a larger number of symbols (e.g., from 4 to 14 symbols) than the short PUCCH. In FIG. 1B, the long PUCCH is not mapped to a certain number of symbols at the beginning of the slot, but it can be mapped to a certain number of symbols at the beginning.

[019] As illustrated in FIG. 1B, to obtain a power boosting effect, the long PUCCH can consist of a smaller number of frequency resources (for example, one or two PRBs) than the short PUCCH or it can consist of the same number of frequency resources as the short PUCCH.

[020] The long PUCCH can be frequency-division multiplexed with a PUSCH in the slot. The long PUCCH can be time-division multiplexed with a PDCCH in the slot. The long PUCCH can be mapped to the same slot as the short PUCCH. The long PUCCH can use a single carrier waveform (e.g., a DFT-s-OFDM waveform). Petition 870200126267, dated 06 / 10 / 2020, p. 13 / 68 7 / 56 or you can use a multicarrier waveform (for example, an OFDM waveform).

[021] As shown in FIG. 1B, frequency hopping can be employed in long PUCCH for each determined duration in the slot (e.g., mini (sub) slot). Frequency hopping can be performed in a timing where the number of symbols to be transmitted before and after the frequency hopping is equal (e.g., in a case of 14 symbols per slot, 7 symbols) or it can be performed in a timing where the number of symbols before and after the frequency hopping is unequal (e.g., in a case of 14 symbols per slot, 6 symbols in the first half and 8 symbols in the second half, and so on).

[022] FIG. 2 is a diagram to show an example of PUCCH formats in the future radiocommunication system. FIG. 2 shows a plurality of PUCCH formats having various numbers of symbols and / or numbers of UTI bits. It is worth noting that the PUCCH formats shown in FIG. 2 are merely examples, and the contents of PUCCH formats 0 to 4 are not limited to those shown in FIG. 2.

[023] For example, in FIG. 2, the PUCCH format 0 is a short PUCCH (e.g., FIG. 1A) for UCI up to 2 bits, and is also referred to as a sequence-based short PUCCH and so on. The short PUCCH transmits UCI up to 2 bits (e.g., HARQ-ACK and / or SR), using 1 or 2 symbols.

[024] PUCCH format 1 is a long PUCCH (e.g., FIG. 1B) for up to 2-bit UCI. The long PUCCH transmits up to 2-bit UCI using 4 to 14 symbols. In PUCCH format 1, a plurality of user terminals can be code-division multiplexed (CDM) within the same Petition 870200126267, dated 06 / 10 / 2020, page 14 / 68 8 / 56 PRB, for example, through block scattering in the time domain using cyclic shift (CS) and / or orthogonal cover coding (OCC).

[025] PUCCH format 2 is a short PUCCH (e.g., FIG. 1A) for UCI of more than 2 bits. The short PUCCH transmits UCI of more than 2 bits, using 1 or 2 symbols.

[026] The PUCCH 3 format is a long PUCCH (e.g., FIG. 1B) for UCIs of more than 2 bits, and a plurality of user terminals can be multiplexed within the same PRB. The long PUCCH transmits UCIs of more than 2 bits and less than N bits (or up to N bits), using 4 to 14 symbols. In the PUCCH 3 format, a plurality of user terminals can be multiplexed by code division within the same PRB, by means of block spreading in the time domain using CS and / or OCC. Alternatively, a plurality of user terminals can be multiplexed using at least one of block spreading (frequency domain) before discrete Fourier transform (DFT), frequency division multiplexing (FDM), and comb subcarriers.

[027] It is worth noting that the threshold N for the number of UCI bits needs to be an integer greater than 3 (either 3 or more). The threshold N can be defined in a specification or can be configured by upper-layer signaling (e.g., at least one of RRC (Radio Resource Control) signaling and broadcast information (e.g., MIB (Master Information Block), system information (e.g., SIB (System Information Block), RMSI (Minimum Remaining System Information), and so on))).

[028] The PUCCH format 4 is a long PUCCH (e.g., FIG. 1B) for UCIs of more than 2 bits, and a single user terminal is multiplexed Petition 870200126267, dated 06 / 10 / 2020, page 15 / 68 9 / 56 within the same PRB. The long PUCCH transmits UCI of more than N bits (or N bits or more). The 4-bit PUCCH format differs from the 3-bit PUCCH format in that a plurality of user terminals is not multiplexed within the same PRB.

[029] Incidentally, in PUCCH formats 0 to 4 described above, depending on the duration (the number of symbols) and / or the number of UCI bits that can be transmitted, a different coverage range is assumed. For example, since the long PUCCH (PF1 / 3 / 4) includes a greater number of symbols than the short PUCCH (PF0 / 2), the coverage of the long PUCCH is greater than the coverage of the short PUCCH.

[030] It is also assumed that the short PUCCH (PF0) for UCIs up to 2 bits uses a DFT-s-OFDM (orthogonal frequency division multiplexing discrete Fourier transform spread) spreading OFDM waveform with a low PAPR (peak-to-average power ratio), and the short PUCCH (PF2) for UCIs over 2 bits uses an OFDM waveform. In this case, in PF0 / 2, each of which is also the short PUCCH, the PF0 with the smaller number of bits that can be transmitted has a greater coverage than the PF2.

[031] Furthermore, it is assumed that, in the long PUCCH (PF1) for UTIs of up to 2 bits, the cyclic redundancy check (CRC (cyclic redundancy code)) is not added to the UTIs and the CRC is added to the long PUCCH (PF3 / 4) for UTIs of more than 2 bits. In this case, in PF1 / 3 / 4, each of which is also the long PUCCH, the PF1 with the smallest number of bits that can be transmitted has a larger coverage than the coverages of PF3 / 4.

[032] As described above, among a plurality of PUCCH formats with different durations and / or numbers of bits that can be transmitted, different coverage is assumed. Therefore, as Petition 870200126267, dated 06 / 10 / 2020, p. 16 / 68 10 / 56 result of an appropriate PUCCH format not being applied to a user terminal (a limited coverage UE) whose coverage is limited to a certain range, the quality of the UL control channel may deteriorate.

[033] Therefore, the inventors of the present invention had the idea of ​​controlling the fallback of the PUCCH format based on information from a base radio station, which makes it possible to prevent the deterioration of the quality of the UL control channel when a plurality of PUCCH formats support different durations and / or numbers of bits that can be transmitted.

[034] The present embodiment will be described in detail below. In the present embodiment, a user terminal transmits uplink control (UCI) information using a short PUCCH (an uplink control channel of a first duration) and / or a long PUCCH (an uplink control channel of a second duration). The user terminal receives fallback-related information from the short PUCCH and / or the long PUCCH, and controls a PUCCH format (format) to be used for UCI transmission based on the fallback-related information.

[035] Here, fallback means that the user terminal switches from one configured (i.e., currently used) PUCCH format to another PUCCH format. Fallback can be performed between PUCCH formats having the same duration and different numbers of bits that can be transmitted (e.g., fallback from PF2 to PF0 or fallback from PF3 / 4 to PF1). Fallback can also be performed between PUCCH formats with different durations and the same number of bits that can be transmitted (e.g., fallback from PF0 to PF1 or fallback from PF2 to PF3 / 4). Petition 870200126267, dated 06 / 10 / 2020, page 17 / 68 11 / 56

[036] Fallback-related information may include, for example, command information (trigger information) to command (trigger) the fallback to the user terminal and / or fallback-related configuration information. Fallback-related information may be included in downlink control information (DCI) transmitted over a DL control channel (e.g., PDCCH) and / or may be configured via upper-layer signaling.

[037] The command information described above may be one-bit information to command whether or not the fallback should be performed (e.g., 1: perform fallback, 0: do not perform fallback). In addition, configuration information may include, for example, at least one piece of information indicating one or more features used by a fallback target PUCCH format (feature information), information indicating a fallback target PUCCH format (PUCCH format information), and information indicating a short PUCCH or a long PUCCH (PUCCH type information), and so on.

[038] UCIs may include at least one of the following: scheduling request (SR), retransmission control information (HARQ-ACK (hybrid automatic repeat request acknowledgment), ACK or NACK (negative ACK) for DL ​​data (a DL data channel (e.g., PDSCH (Physical Downlink Shared Channel))), channel state information (CSI), and beam-related information.

[039] Hereafter, cases in which PUCCH formats 0 to 4 shown in FIG. 2 are used are described as examples, but the PUCCH formats that can be applied to fallback control of Petition 870200126267, dated 06 / 10 / 2020, page 18 / 68 12 / 56 The present modality is not limited to those shown in FIG. 2, and its names and configurations may be changed as appropriate. (First Aspect)

[040] In a first aspect, fallback control based on a predetermined rule is described. A user terminal can determine, in a case of receiving command information to command the fallback (for example, a bit value of 1: perform fallback) from a base radio station, a PUCCH format of a fallback destination based on a predetermined rule. The command information can be included, for example, in the DCI.

[041] Here, the rule can be determined based on the duration and / or the number of bits that can be transmitted (i.e., information indicating coverage), and can include one or more rules. For example, the rule can be determined in the order of PUCCH format 2, PUCCH format 0 and PUCCH format 1 and / or it can be determined in the order of PUCCH format 3 / 4 and PUCCH format 1.

[042] The user terminal, in a case of receiving the command information described above from the base radio station, can be assumed to perform the fallback in a configured PUCCH format. For example, in a case where PUCCH format 0 is configured for the user terminal, the user terminal can perform the fallback to PUCCH format 1 according to the rule described above.

[043] In the first aspect, since the fallback of the PUCCH format is controlled according to a predetermined rule, it is sufficient for the base radio station to command only the fallback and, therefore, it is possible to reduce the overhead associated with determining the PUCCH format of a fallback destination. Petition 870200126267, dated 06 / 10 / 2020, page 19 / 68 13 / 56 (Second aspect)

[044] In a second aspect, fallback control is described based on control information signaled by means of upper layer signaling (upper layer control information). A user terminal can determine, in a case of receiving command information to command the fallback (for example, a bit value of 1: perform fallback) from a base radio station, a PUCCH format of a fallback destination based on the upper layer control information.

[045] Here, upper-layer control information may be, for example, at least one of the following: broadcast information (MIB), system information (SIB and / or RMSI), control information signaled by means of RRC signaling, and a MAC control element (MAC CE (Medium Access Control Element)). Upper-layer control information may be common to one or more user terminals or may be cell-specific. FIGS. 3A and 3B are diagrams to show examples of upper-layer control information according to the second aspect. <Primeiro controle de fallback>

[046] As shown in FIG. 3A, the upper-layer control information described above may include information indicating a PUCCH format of a fallback destination (PUCCH format information). For example, in FIG. 3A, the PUCCH format information designates any of the PUCCH formats from 0 to 4.

[047] As shown in FIG. 3A, when the upper layer control information includes PUCCH format information, the user terminal can perform, in response to receiving information from Petition 870200126267, dated 06 / 10 / 2020, page 20 / 68 14 / 56 command to initiate fallback from the base radio station, fallback to a PUCCH format designated by the PUCCH format information. <Segundo controle de fallback>

[048] Alternatively, as shown in FIG. 3B, the upper-layer control information described above may include information indicating a PUCCH type from a fallback destination (PUCCH type information). For example, in FIG. 3B, the PUCCH type information designates a short PUCCH (FIG. 1A) or a long PUCCH (FIG. 1B). It is worth noting that it is sufficient for the PUCCH type information to be information to designate the short PUCCH or the long PUCCH, and the information may be, for example, the number of symbols that constitute the PUCCH or similar.

[049] As shown in FIG. 3B, when the upper layer control information includes PUCCH type information, the user terminal can determine, in response to receiving command information to command fallback from the base radio station, a PUCCH format of a fallback destination based on the PUCCH type information. <<Caso em que é designado o PUCCH curto> >

[050] In a case where the PUCCH type information (e.g., FIG. 3B) designates a short PUCCH, the user terminal can determine a PUCCH format from a fallback destination based on the currently configured PUCCH format.

[051] For example, in a case where the user terminal in which PUCCH format 2 is configured receives the command information to command the fallback from the base radio station, the fallback to PUCCH format 0 may be performed. In this case, although the ratings of Petition 870200126267, dated 06 / 10 / 2020, page 21 / 68 15 / 56 If the PUCCH (short PUCCH) values ​​are the same before and after the fallback, the number of bits that can be transmitted is reduced.

[052] Therefore, the user terminal can control, based on the number of UCI bits that can be transmitted by the fallback destination PUCCH format and on a type and / or number of UCI bits to be transmitted, the selection of UCIs to be transmitted (e.g., a certain number of HARQ-ACKs) and / or discard at least part of the UCIs (e.g., CSI and / or SR).

[053] Here, the UTI type indicates that at least one of HARQ-ACK, SR, and CSI can be referred to as a type or the content or similar of the UTIs. It is worth noting that CSI can be reformulated as at least one of channel state information (CQI (Channel Quality Indicator)), a classification indicator (RI), and a pre-coding matrix indicator (PMI).

[054] For example, (1) in a case where the user terminal performs fallback to PUCCH format 0 and where the UCIs to be transmitted include HARQ-ACK up to 2 bits, the HARQ-ACK up to 2 bits can be transmitted by PUCCH format 0 and the other UCIs (e.g., CSI and / or SR) can be discarded.

[055] (2) In a case where the user terminal performs fallback to PUCCH format 0 and where the UCIs to be transmitted include HARQ-ACKs of more than 2 bits, a certain number (e.g., two) of HARQACKs to be transmitted by PUCCH format 0 described above may be selected and the other UCIs (e.g., CSI and / or SR) may be discarded.

[056] The correct number of HARQ-ACKs can be selected based on a cell identifier (a cell ID) with which the DL data corresponding to the HARQ-ACK is transmitted. One can select, by Petition 870200126267, dated 06 / 10 / 2020, page 22 / 68 16 / 56 example, the correct number of HARQ-ACKs with the maximum or minimum cell ID.

[057] The correct number of HARQ-ACKs can be selected based on an index (TB index) of a transport block (TB) of the DL data corresponding to the HARQ-ACK. For example, the correct number of HARQ-ACKs can be selected with the maximum or minimum TB index. In this case, the HARQ-ACK can be generated in one TB unit.

[058] The correct number of HARQ-ACKs can be selected based on an index (CC index) of a component carrier (CC) with which the DL data corresponding to the HARQ-ACK is transmitted. For example, the correct number of HARQ-ACKs can be selected with the maximum or minimum CC index.

[059] The correct number of HARQ-ACKs can be selected based on an index (CBG index) of a code block group (CBG) of the DL data corresponding to the HARQ-ACK. For example, the correct number of HARQ-ACKs can be selected with the maximum or minimum CBG index. The CBG includes one or more CBs and the TB includes one or more CBGs. In this case, the HARQ-ACK can be generated in one CBG unit.

[060] As described above, based on at least one of the cell ID, TB index, CC index, and CBG index, the user terminal can select the UCIs (e.g., the specified number of HARQ-ACKs) to be transmitted by the fallback destination PUCCH and can drop the other UCIs (e.g., CSI).

[061] (3) In a case where the user terminal performs fallback to PUCCH format 0 and where the UCIs to be transmitted include HARQ-ACKs of more than 2 bits, a certain number of HARQ-ACKs may be Petition 870200126267, dated 06 / 10 / 2020, p. 23 / 68 17 / 56 grouped into up to 2 bits, and the other ITUs (e.g., CSI and / or SR) can be discarded.

[062] The certain number of HARQ-ACKs to be grouped may be at least one of a certain number of DL slot HARQ-ACKs, a certain number of codeword (CW) HARQ-ACKs (space grouping), a certain number of CBG HARQ-ACKs and a certain number of CC HARQ-ACKs.

[063] (4) In a case where the user terminal performs fallback to PUCCH format 0 and where the UCIs to be transmitted include HARQ-ACKs of more than 2 bits, the 3-bit HARQ-ACK may be transmitted and the other UCIs (e.g., CSI and / or SR) may be discarded. The 3-bit HARQ-ACK may be selected based on at least one of the cell ID, TB index, CC index and CBG index and / or a certain number of HARQ-ACKs may be grouped. <<Caso em que é designado o PUCCH longo> >

[064] In a case where the PUCCH type information (e.g., FIG. 3B) designates a long PUCCH, the user terminal can determine a PUCCH format from a fallback destination based on a currently configured PUCCH format. Specifically, the user terminal can determine a PUCCH format from a fallback destination based on the number of UCI bits that can be transmitted by a currently configured PUCCH format.

[065] For example, in a case where the user terminal in which the PUCCH 0 short format is configured receives the command information to command the fallback from the base radio station, the fallback to the PUCCH 1 long format that can transmit the same number of bits as the PUCCH 0 format described above can be performed. Petition 870200126267, dated 06 / 10 / 2020, page 24 / 68 18 / 56

[066] In a case where the user terminal in which the short PUCCH format 2 is configured receives the command information to command the fallback from the base radio station, the fallback to the long PUCCH format 3 or 4 (3 / 4) that can transmit the same number of bits as the PUCCH format 2 described above can be performed.

[067] In a fallback case from PUCCH format 2 to PUCCH format 3 / 4, the top-layer control information in FIG. 3B may include information indicating a PUCCH format of a fallback target (here, one of PUCCH formats 3 and 4), in addition to the PUCCH type information. Alternatively, it may be defined in a specification whether the fallback to PUCCH format 3 or 4 should be performed.

[068] In PUCCH format 3, as described above, since a plurality of user terminals are multiplexed on the same PRB, performing fallback to PUCCH format 3 can improve the efficiency of radio resource utilization. On the other hand, in PUCCH format 4, since a plurality of user terminals are not multiplexed on the same PRB, performing fallback to PUCCH format 4 can improve the UCI reception quality at the base radio station.

[069] In a case where the user terminal in which PUCCH format 3 or 4 is configured receives command information from the base radio station, fallback to PUCCH format 1 may be performed. In this case, although the PUCCH (long PUCCH) ratings are the same before and after the fallback, the number of bits that can be transmitted decreases.

[070] Therefore, the user terminal can control, based on the number of UCI bits that can be transmitted by the PUCCH format Petition 870200126267, dated 06 / 10 / 2020, page 25 / 68 19 / 56 of the fallback destination and a type and / or number of UCI bits to be transmitted, the selection of UCIs to be transmitted (e.g., a certain number of HARQ-ACKs) and / or discarding at least part of the UCIs (e.g., CSI and / or SR).

[071] Specifically, based on at least one of the cell ID, TB index, CC index, and CBG index, the user terminal can select the UCIs (e.g., the specified number of HARQ-ACKs) to be transmitted via PUCCH format 1 from the fallback destination and can discard the other UCIs (e.g., CSI and / or SR). It is worth noting that the selection and discard details are the same as for fallback from PUCCH format 2 to PUCCH format 0.

[072] The user terminal can group a certain number of HARQACKs into up to 2 bits, and can drop the other UCIs (e.g., CSI and / or SR). It is worth noting that the grouping and dropping details are the same as the fallback from PUCCH format 2 to PUCCH format 0.

[073] In the second aspect, based on upper layer control information, the user terminal can properly determine a PUCCH format from a fallback destination and can properly control UCI transmission in PUCCH format. (Third Aspect)

[074] In a third aspect, the allocation of PUCCH resources will be described in a case where the fallback of the PUCCH format is performed as described in the first aspect or the second aspect. <Primeira alocação de recursos de PUCCH>

[075] In the first allocation of PUCCH resources, one or more sets of parameters indicating a PUCCH resource for each PUCCH format. Petition 870200126267, dated 06 / 10 / 2020, page 26 / 68 20 / 56 can be configured via upper-layer signaling, and one of the parameter sets can be assigned by the DCI.

[076] Here, each parameter set includes one or more parameters. For example, each parameter set may include information (parameter) indicating at least one of a PUCCH format, a PRB index in a given band (e.g., an initial index of a PRB allocated to the PUCCH in a UL BWP (bandwidth portion)), the number of PRBs, a symbol index in a slot (e.g., an index of a first symbol allocated to the PUCCH in a slot), a duration in a slot (the number of symbols or an index of a last symbol allocated to the PUCCH in a slot), a code index (e.g., a CS value and / or an OCC index), and a sequence index.

[077] Each parameter set may include a different parameter and / or the same parameter for each PUCCH format. Each parameter set may include a different parameter and / or the same parameter for each UCI type.

[078] FIGS. 4A and 4B are diagrams to show examples of the first allocation of PUCCH resources according to the third aspect. In FIG. 4A, each value of a given field in the DCI is associated with a set of parameters indicating a PUCCH resource for the 0 PUCCH format for UCI up to 2 bits. For example, FIGS. 4A and 4B show the parameter sets 0-0 and 0-1 for the 0 PUCCH format and the parameter sets 1-0 and 1-1 for the 1 PUCCH format.

[079] On the other hand, in FIG. 4B, each value of a given field in the DCI is associated with a set of parameters indicating a PUCCH feature for the 2 / 3 / 4 PUCCH format for UCIs of more than 2 bits. For example, FIG. 4B shows the parameter sets 2-0 and 2-1 for the Petition 870200126267, dated 06 / 10 / 2020, page 27 / 68 21 / 56 for PUCCH format 2 and parameter sets 3-0 and 3-1 for PUCCH format 3.

[080] In FIGS. 4A and 4B, the set of parameters associated with the values ​​of a certain DCI field is configured for the user terminal via upper-layer signaling. For example, in a DCI reception case, including command information for fallback command (e.g., a bit value of 1: perform fallback), with reference to the table shown in FIG. 4A or FIG. 4B, the user terminal can specify a PUCCH feature based on a set of parameters associated with a value in a given DCI field.

[081] It is worth noting that two different tables are shown according to the number of bits of the UCI in FIGS. 4A and 4B, but the configuration is not limited to this, and a single table can be used. In each table, one or more sets of parameters can be assigned indicating PUCCH features of one or more PUCCH formats. <Segunda Alocação de Recursos de PUCCH>

[082] In the second PUCCH resource allocation, one or more sets of parameters indicating a PUCCH resource in a case without fallback and one or more sets of parameters indicating a PUCCH resource in a case with fallback can be configured through upper-layer signaling, and one of the sets of parameters can be assigned by the DCI.

[083] One or more parameters included in each parameter set are as described in the first PUCCH resource allocation. The following description will focus on the differences from the first PUCCH resource allocation.

[084] FIG. 5 is a diagram to show an example of PUCCH's second resource allocation according to the third aspect. As Petition 870200126267, dated 06 / 10 / 2020, page 28 / 68 22 / 56 illustrated in FIG. 5, each value in a certain field in the DCI can be associated with one or more sets of parameters indicating a PUCCH feature in a case without fallback and one or more sets of parameters indicating a PUCCH feature in a case with fallback.

[085] In FIG. 5, each value of the parameter sets A0 to A3 in a case without fallback and of the parameter sets B0 to B3 in a case with fallback is configured for the user terminal by means of upper layer signaling.

[086] For example, in a DCI reception case, including command information for fallback command (e.g., a bit value of 1: perform fallback), with reference to the table shown in FIG. 5, the user terminal can specify a PUCCH feature based on the set of fallback parameters (any one from B0 to B3) associated with a value in a given DCI field.

[087] On the other hand, in a case where the fallback is not commanded (for example, DCI including a bit value of 0: do not perform fallback is received), with reference to the table shown in FIG. 6, the user terminal can specify a PUCCH feature based on the set of parameters without fallback (any one from A0 to A3) associated with a certain DCI field value.

[088] In the case shown in FIG. 5, a value in a single field in the DCI may indicate different PUCCH features between a case without fallback and a case with fallback.

[089] FIG. 6 is a diagram to show another example of second allocation of PUCCH resources according to the third aspect. As illustrated in FIG. 6, each value in a certain field in the DCI can be associated with one or more sets of parameters indicating a PUCCH resource in a Petition 870200126267, dated 06 / 10 / 2020, page 29 / 68 23 / 56 case without fallback, one or more sets of parameters indicating a PUCCH feature in a case with fallback, and information indicating which of the cases with and without fallback should be enabled (enable information).

[090] In FIG. 6, each value of the parameter sets A0 to A3 in a case without fallback and of the parameter sets B0 to B3 in a case with fallback and the enablement information are configured for the user terminal by means of upper layer signaling.

[091] For example, in a DCI reception case including a certain field value 01 in the table shown in FIG. 6, since the enablement information associated with the certain field value 01 indicates with fallback, the user terminal can specify a PUCCH resource based on the parameter set B0 with fallback.

[092] On the other hand, in a DCI reception case including a certain field value 00, since the activation information associated with a certain field value 00 indicates no fallback, the user terminal can specify a PUCCH resource based on the A0 parameter set without fallback.

[093] In a case shown in FIG. 6, a value in a single field in the DCI can indicate different PUCCH features between a case without fallback and a case with fallback, and as the command information to command the fallback, the single field value can also be used. (Radio Communication System)

[094] Hereafter, a radio communication system structure will be described according to the present embodiment. In this radio communication system, radio communication methods are employed according to the modalities described above. It is worth noting that the radio communication methods according to the aspects described above may be Petition 870200126267, dated 06 / 10 / 2020, page 30 / 68 24 / 56 employed independently or may be employed by combining at least two of the radiocommunication methods.

[095] FIG. 7 is a diagram to show an example of a schematic structure of the radiocommunication system according to the present embodiment. A radiocommunication system 1 may adopt carrier aggregation (CA) and / or dual connectivity (DC) to group a plurality of fundamental frequency blocks (component carriers) into one, wherein the bandwidth system in an LTE system (e.g., 20 MHz) constitutes a unit. It is worth noting that the radiocommunication system 1 may be referred to as “SUPER 3G”, “LTE-A (LTE Advanced)”, “IMT-Advanced”, 4G, 5G, FRA (Future Radio Access), NR (New RAT: New Radio Access Technology) and so on.

[096] The radio communication system 1 shown in FIG. 7 includes a base radio station 11 that forms a macrocell C1, and base radio stations 12a to 12c that form small cells C2, which are placed inside the macrocell C1 and are narrower than the macrocell C1. In addition, user terminals 20 are placed in the macrocell C1 and in each small cell C2. A configuration can be adopted in which different numerologies are applied between cells and / or within a cell.

[097] Here, numerology refers to communication parameters in the frequency and / or time direction (e.g., at least one of the following: subcarrier spacing (subcarrier gap), bandwidth, symbol length, CP time length (CP length), subframe length, TTI duration (TTI length), number of symbols per TTI, radio frame structure, filtering process, windowing process, and so on). Radio communication system 1 can support spacings of Petition 870200126267, dated 06 / 10 / 2020, page 31 / 68 25 / 56 subcarriers of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz and so on, for example.

[098] User terminals 20 can connect to both radio base station 11 and radio base stations 12. User terminals 20 can use macrocell C1 and small cells C2 simultaneously via AC or DC. Furthermore, user terminals 20 can adopt AC or DC using a plurality of cells (CCs) (e.g., two or more CCs). Moreover, user terminals can use licensed band CCs and unlicensed band CCs as a plurality of cells.

[099] Furthermore, user terminal 20 can perform communication using time-division duplexing (TDD) or frequency-division duplexing (FDD) in each cell. A TDD cell and an FDD cell can be referred to as a TDD carrier (type 2 frame structure) and an FDD carrier (type 1 frame structure), respectively, for example.

[0100] Furthermore, each cell (carrier) can use a unique numerology or a plurality of different numerologies.

[0101] Between user terminals 20 and base radio station 11, communication can be carried out using a relatively low frequency band carrier (e.g., 2 GHz) and a narrow bandwidth (referred to, for example, as an existing carrier, a “legacy carrier,” and so on). Meanwhile, between user terminals 20 and base radio stations 12, a relatively high frequency band carrier (e.g., 3.5 GHz, 5 GHz, 30 to 70 GHz, and so on) and a wide bandwidth can be used, or the same carrier as that used at base radio station 11. It is worth noting that the frequency band structure for use at each base radio station is not limited to these. Petition 870200126267, dated 06 / 10 / 2020, page 32 / 68 26 / 56

[0102] A structure can be employed in which a wired connection (e.g., a CPRI (Common Public Radio Interface) compliant optical fiber, an X2 interface, and so on) or wireless connection is established between base radio station 11 and base radio stations 12 (or between two base radio stations 12).

[0103] Base radio station 11 and base radio stations 12 are each connected to a top station device 30 and are connected to a core network 40 via the top station device 30. It is worth noting that the top station device 30 can be, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and so on, without being limited to these. Furthermore, each base radio station 12 can be connected to the top station device 30 via base radio station 11.

[0104] It is worth noting that base radio station 11 is a base radio station having relatively wide coverage, and may be referred to as a macro base station, a central node, an eNB (eNodeB), a gNB (gNodeB), a transmit / receive point (TRP), and so on. In addition, base radio stations 12 are base radio stations having local coverage and may be referred to as small base stations, micro base stations, pico base stations, femto base stations, HeNBs (domestic eNodeBs), RRHs (remote radio heads), eNBs, gNBs, transmit / receive points, and so on. Hereafter, base radio stations 11 and 12 will be collectively referred to as base radio stations 10, unless otherwise specified.

[0105] User terminals 20 are terminals to support various communication schemes, such as LTE, LTE-A, 5G, NR, and so on, and Petition 870200126267, dated 06 / 10 / 2020, page 33 / 68 27 / 56 can be mobile communication terminals or stationary communication terminals. Furthermore, user terminals 20 can perform device-to-device (D2D) communication with other user terminals 20.

[0106] In radio communication system 1, as radio access schemes, OFDMA (Orthogonal Frequency Division Multiple Access) can be applied to the downlink (DL), and SC-FDMA (Single Carrier Frequency Division Multiple Access) can be applied to the uplink (UL). OFDMA is a multi-carrier communication scheme to perform communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single-carrier communication scheme to mitigate interference between terminals by dividing the system bandwidth into bands formed with one or more blocks of contiguous resources per terminal, and allowing a plurality of terminals to use mutually different bands. It is worth noting that uplink and downlink radio access schemes are not limited to combinations thereof, and OFDMA can be used in the UL.

[0107] Furthermore, in radiocommunication system 1, a multicarrier waveform (e.g., an OFDM waveform) or a single carrier waveform (e.g., a DFT-s-OFDM waveform) may be used.

[0108] In radio communication system 1, a DL data channel (also referred to as PDSCH (Physical Downlink Shared Channel), also referred to as “DL data channel” and so on), which is used by each user terminal 20 in a shared manner, a broadcast channel (PBCH (Physical Broadcast Channel)), L1 / L2 control channels and so on. Petition 870200126267, dated 06 / 10 / 2020, page 34 / 68 Channels 28 / 56 onwards are used as DL channels. User data, upper-layer control information, and SIBs (system information blocks), and so on, are communicated on the PDSCH. Additionally, MIBs (master information blocks) are communicated on the PBCH.

[0109] The L1 / L2 control channels include a DL control channel (e.g., PDCCH (Physical Downlink Control Channel) and / or an EPDCCH (Enhanced Physical Downlink Control Channel)), a PCFICH (Physical Control Format Indicator Channel), a PHICH (Physical Hybrid ARQ Indicator Channel), and so on. Downlink control information (DCI), including PDSCH and / or PUSCH scheduling information, is communicated by the PDCCH. The number of OFDM symbols to be used for the PDCCH is communicated in the PCFICH. The EPDCCH is frequency-division multiplexed with the PDSCH and used to communicate the DCI and so on, similarly to the PDCCH. HARQ (ACK / NACK) retransmission control information in response to a PUSCH can be communicated in at least one of the following: PHICH, PDCCH, and EPDCCH.

[0110] In radio communication system 1, a UL data channel (PUSCH (Physical Uplink Shared Channel), also referred to as “UL data channel” and so on), which is used by each user terminal 20 in a shared manner, a UL control channel (PUCCH (Physical Uplink Control Channel)), a random access channel (PRACH (Physical Random Access Channel)), and so on, are used as UL channels. User data and upper-layer control information are carried on the PUSCH. Uplink control information (UCI), including at least one of the following DL signal retransmission control information (A / N), channel status information Petition 870200126267, dated 06 / 10 / 2020, pp. 35 / 68 29 / 56 (CSI), and so on, are communicated in PUSCH or PUCCH. Through PRACH, random access preambles can be communicated to establish connections with the cells. <Estação Rádio Base>

[0111] FIG. 8 is a diagram to show an example of a general structure of the base radio station according to the present embodiment. A base radio station 10 is provided with a plurality of transmit / receive antennas 101, amplification sections 102, transmit / receive sections 103, a baseband signal processing section 104, a call processing section 105 and a communication path interface 106. It is worth noting that the base radio station 10 can be configured to include one or more transmit / receive antennas 101, one or more amplification sections 102 and one or more transmit / receive sections 103.

[0112] The input of user data to be transmitted from base radio station 10 to a user terminal 20 on the DL link is done from the upper station device 30 to the baseband signal processing section 104, via the communication path interface 106.

[0113] In the baseband signal processing section 104, user data undergoes transmission processes such as a PDCP (Packet Data Convergence Protocol) layer process, user data splitting and coupling, RLC (Radio Link Control) layer transmission processes such as RLC retransmission control, MAC (Medium Access Control) retransmission control (e.g., a HARQ (Hybrid Automatic Repeat Request) process), scheduling, transport format selection, channel encoding, an inverse fast Fourier transform (IFFT) process, and a pre-process. Petition 870200126267, dated 06 / 10 / 2020, pp. 36 / 68 30 / 56 encoding, and the result is forwarded to each transmission / reception section 103. Furthermore, the downlink control signals are also subjected to transmission processes, such as channel coding and / or an inverse fast Fourier transform (IFFT), and the result is forwarded to each transmission / reception section 103.

[0114] The transmission / reception sections 103 convert baseband signals that are pre-coded and emitted from the baseband signal processing section 104 by antenna, to have radio frequency bands and transmit the result. The radio frequency signals subjected to frequency conversion in the transmission / reception sections 103 are amplified in the amplification sections 102 and transmitted from the transmission / reception antennas 101.

[0115] The transmission / reception sections 103 may consist of transmitters / receivers, transmission / reception circuits or parts of transmission / reception apparatus that may be described based on the general understanding of the technical field to which the present invention pertains. It is worth noting that each transmission / reception section 103 may be structured as a transmission / reception section in one entity, or may consist of a transmission section and a reception section.

[0116] Meanwhile, regarding UL signals, the radio frequency signals received at the transmit / receive antennas 101 are amplified in the amplification sections 102. The transmit / receive sections 103 receive the UL signals amplified in the amplification sections 102. The transmit / receive sections 103 convert the received signals into the baseband signal by means of frequency conversion and transmit it to the baseband signal processing section 104. Petition 870200126267, dated 06 / 10 / 2020, pp. 37 / 68 31 / 56

[0117] In the baseband signal processing section 104, the UL data included in the input UL signals are subjected to a Fast Fourier Transform (FFT) process, a Discrete Inverse Fourier Transform (IDFT) process, error correction decoding, a MAC retransmission control reception process, and RLC and PDCP layer reception processes, and forwarded to the higher station device 30 via the communication path interface 106. The call processing section 105 performs call processing, such as defining and releasing communication channels, managing the base radio station state 10, and managing radio resources.

[0118] The transmission path interface 106 transmits and / or receives signals to and / or from the higher station apparatus 30 via a certain interface. In addition, the communication path interface 106 can transmit and / or receive signals (backhaul signaling) with neighboring base radio stations 10 via an interbase station interface (e.g., a CPRI (Common Public Radio Interface) compliant fiber optic cable and an X2 interface).

[0119] In addition, the transmission / reception sections 103 transmit DL signals (including at least one of the DL data signals, DL control signals and DL reference signals) to the user terminals 20, and receive UL signals (including at least one of the UL data signals, UL control signals and UL reference signals) from the user terminals 20.

[0120] Furthermore, the transmission / reception sections 103 receive UCI from the user terminal 20 using a UL data channel (e.g., PUSCH) or a UL control channel (e.g., a short PUCCH and / or a long PUCCH). The UCI may include at least one of Petition 870200126267, dated 06 / 10 / 2020, pp. 38 / 68 32 / 56 HARQ-ACK of a DL data channel (e.g., PDSCH), CSI, SR, beam identification information (e.g., a beam index (BI)), and a buffer status report (BSR).

[0121] Furthermore, the transmit / receive sections 103 can transmit, by means of physical layer signaling (L1 signaling) and / or upper layer signaling, control information related to the UL control channel (e.g., a short PUCCH, a long PUCCH) (e.g., at least one of a format, the number of PUCCH units in a slot, a PUCCH unit size, an RS multiplexing method, an RS mapping position, the presence or absence of RS, RS density, the presence or absence of SRS, a feature for the UL control channel).

[0122] Furthermore, the transmission / reception sections 103 can transmit fallback-related information (e.g., the command information and / or configuration information described above).

[0123] FIG. 9 is a diagram to show an example of a functional structure of a base radio station according to the present embodiment. It is worth noting that, although FIG. 9 mainly shows functional blocks belonging to characteristic parts of the present embodiment, the base radio station 10 includes other functional blocks that are also necessary for radiocommunication. As illustrated in FIG. 9, the baseband signal processing section 104 is provided with a control section 301, a transmission signal generation section 302, a mapping section 303, a received signal processing section 304 and a measurement section 305.

[0124] Control section 301 controls the entire base station 10. Control section 301 controls, for example, the generation of DL signals by Petition 870200126267, dated 06 / 10 / 2020, pp. 39 / 68 33 / 56 transmission signal generation section 302, DL signal mapping by mapping section 303, reception processes (e.g., demodulation) for UL signals by received signal processing section 304, and measurements by measurement section 305.

[0125] More specifically, control section 301 performs scheduling for user terminals 20. Specifically, control section 301 can perform scheduling and / or retransmission control of the DL data channel and / or UL data channel based on UCI (e.g., CSI and / or BI) from user terminals 20.

[0126] Furthermore, control section 301 can control a structure (format) of a UL control channel (e.g., a long PUCCH and / or a short PUCCH) and perform the control to transmit control information related to the UL control channel.

[0127] Furthermore, control section 301 can control the fallback of a UL control channel (e.g., a long PUCCH and / or a short PUCCH), and can control the generation and / or transmission of fallback-related information.

[0128] In addition, control section 301 can control a PUCCH resource.

[0129] Control section 301 can control received signal processing section 304 to perform a UCI reception process from user terminals 20, based on the UL control channel format.

[0130] Control section 301 may consist of a controller, a control circuit or a control apparatus that can be described based on a general understanding of the technical field to which the present invention pertains. Petition 870200126267, dated 06 / 10 / 2020, pp. 40 / 68 34 / 56

[0131] The transmission signal generation section 302 generates DL signals (including DL data signals, DL control signals and DL reference signals) based on commands from the control section 301 and transmits the DL signals to the mapping section 303.

[0132] The transmission signal generation section 302 may be a signal generator, a signal generation circuit or a signal generation apparatus that may be described based on a general understanding of the technical field to which the present invention pertains.

[0133] The mapping section 303 maps the DL signals generated in the transmission signal generation section 302 to specific radio resources based on commands from the control section 301 and transmits them to the transmission / reception sections 103. The mapping section 303 may be a mapper, a mapping circuit, or a mapping apparatus, as may be described based on a general understanding of the technical field to which the present invention pertains.

[0134] The received signal processing section 304 performs a reception process (e.g., demapping, demodulation, decoding, and so on) of UL signals (including, for example, UL data signals, UL control signals, and UL reference signals) transmitted from the user terminals 20. Specifically, the received signal processing section 304 can transmit the received signals, the signals after the reception process, and so on, to the measurement section 305. Furthermore, the received signal processing section 304 performs the UCI reception process based on the UL control channel structures according to commands from the control section 301.

[0135] Measurement section 305 conducts measurements with respect to the received signals. Measurement section 305 may consist of a meter, a Petition 870200126267, dated 06 / 10 / 2020, pp. 41 / 68 35 / 56 measuring circuit or measuring apparatus that can be described based on a general understanding of the technical field to which the present invention belongs.

[0136] Measurement section 305 can measure channel quality at the UL based on, for example, received power (e.g., RSRP (received reference signal power)), and / or received quality (e.g., RSRQ (received reference signal quality)) of UL reference signals. Measurement results can be sent to control section 301. <Terminal de Usuário>

[0137] FIG. 10 is a diagram to show an example of a general structure of a user terminal according to the present embodiment. A user terminal 20 includes a plurality of transmit / receive antennas 201 for MIMO communication, amplification sections 202, transmit / receive sections 203, a baseband signal processing section 204 and an application section 205.

[0138] The radio frequency signals received at the plurality of transmit / receive antennas 201 are amplified in the amplification sections 202. The transmit / receive sections 203 receive the DL signals amplified in the amplification sections 202. The transmit / receive sections 203 convert the received signals into baseband signals by means of frequency conversion, and transmit the baseband signals to the baseband signal processing section 204.

[0139] The baseband signal processing section 204 performs, on each incoming baseband signal, an FFT process, error correction decoding, a retransmission control reception process, and so on. The DL data is forwarded to the application section 205. The application section 205 performs processes Petition 870200126267, dated 06 / 10 / 2020, pp. 42 / 68 36 / 56 relate to upper layers above the physical layer and the MAC layer, and so on. Diffusion information is also forwarded to application section 205.

[0140] Meanwhile, uplink (UL) data is fed from application section 205 to baseband signal processing section 204. Baseband signal processing section 204 performs a retransmission control transmission process (e.g., a HARQ transmission process), channel coding, rate matching, punching, a discrete Fourier transform (DFT) process, an IFFT process, and so on, and the result is forwarded to each transmit / receive section 203. In the UCI, at least one of the following is performed: channel coding, rate matching, punching, a DFT process, and an IFFT process, and the result is transferred to each transmit / receive section 203.

[0141] The transmit / receive sections 203 convert the baseband signals emitted from the baseband signal processing section 204 into a radio frequency band and transmit the result. The radio frequency signals undergoing frequency conversion in the transmit / receive sections 203 are amplified in the amplification sections 202 and transmitted from the transmit / receive antennas 201.

[0142] Furthermore, the transmission / reception sections 203 receive the DL signals (including DL data signals, DL control signals and DL reference signals) from the numerology configured on the user terminals 20 and transmit the UL signals (including UL data signals, UL control signals and UL reference signals) from the numerology.

[0143] Furthermore, the transmit / receive sections 203 transmit UCI to base radio station 10 using a UL data channel (e.g., Petition 870200126267, dated 06 / 10 / 2020, pp. 43 / 68 37 / 56 PUCCH) or a UL control channel (e.g., a short PUCCH and / or a long PUCCH).

[0144] Furthermore, the transmit / receive sections 203 can receive, through physical layer signaling (L1 signaling) and / or upper layer signaling, control information related to the UL control channel (e.g., a short PUCCH, a long PUCCH) (e.g., at least one of a format, the number of PUCCH units in a slot, a PUCCH unit size, an RS multiplexing method, an RS mapping position, the presence or absence of RS, RS density, presence or absence of SRS, a feature for the UL control channel).

[0145] Furthermore, the transmission / reception sections 203 can receive fallback-related information (e.g., the command information and / or configuration information described above).

[0146] The transmission / reception sections 203 may be transmitters / receivers, transmission / reception circuits, or parts of transmission / reception apparatus that may be described based on a general understanding of the technical field to which the present invention pertains. Additionally, each transmission / reception section 203 may be structured as a transmission / reception section within an entity, or may consist of a transmission section and a reception section.

[0147] FIG. 11 is a diagram to show an example of a functional structure of a user terminal according to the present embodiment. It is worth noting that, although FIG. 11 mainly shows functional blocks belonging to characteristic parts of the present embodiment, the user terminal 20 includes other functional blocks that are also necessary for radiocommunication. As shown in FIG. 11, the baseband signal processing section 204 included in the user terminal 20 is Petition 870200126267, dated 06 / 10 / 2020, pp. 44 / 68 38 / 56 provided with a control section 401, a transmission signal generation section 402, a mapping section 403, a received signal processing section 404 and a measurement section 405.

[0148] Control section 401 controls the entire user terminal 20. Control section 401 controls, for example, the generation of UL signals in the transmission signal generation section 402, the mapping of UL signals in the mapping section 403, the reception of DL signals in the received signal processing section 404, and measurements in the measurement section 405, and so on.

[0149] Furthermore, control section 401 controls a UL control channel used for UCI transmission from user terminal 20 based on an explicit command from base radio station 10 or an implicit determination in user terminal 20.

[0150] Furthermore, control section 401 can control a structure (format) of a UL control channel (e.g., a long PUCCH and / or a short PUCCH). Control section 401 can control the format of the UL control channel based on control information from base station 10. Furthermore, control section 401 can control a PUCCH format (an uplink control channel format) to be used for UCI transmission based on fallback-related information.

[0151] Specifically, control section 401 can determine a PUCCH format according to a predetermined rule (first aspect).

[0152] Furthermore, based on information indicating a PUCCH format, or based on information indicating a short PUCCH (an uplink control channel of a first duration) or a long PUCCH Petition 870200126267, dated 06 / 10 / 2020, pp. 45 / 68 39 / 56 (an uplink control channel of a second duration) and / or the number of bits that can be transmitted by a PUCCH format, control section 401 can determine a PUCCH format (second aspect).

[0153] Furthermore, based on the number of bits that can be transmitted by the PUCCH format and on a type and / or number of UCI bits, the 401 control section can control the selection and / or discarding of at least part of the UCIs (first and second aspects).

[0154] Furthermore, control section 401 can determine the PUCCH resources to be used in a PUCCH format based on upper-layer signaling and / or downlink control information (third aspect).

[0155] Control section 401 can control at least one of the following: transmission signal generation section 402, mapping section 403, and transmission / reception sections 203 to perform a UCI transmission process based on the PUCCH format.

[0156] Control section 401 may consist of a controller, a control circuit or a control apparatus that can be described based on a general understanding of the technical field to which the present invention pertains.

[0157] The transmission signal generation section 402 generates (e.g., by means of encoding, rate matching, punching, modulation, and so forth) UL signals (including UL data signals, UL control signals, UL reference signals, and UCI) based on commands from the control section 401 and transmits these signals to the mapping section 403. The transmission signal generation section 402 may be a signal generator, a signal generation circuit, or a signal generation apparatus. Petition 870200126267, dated 06 / 10 / 2020, pp. 46 / 68 40 / 56 signal that can be described based on a general understanding of the technical field to which the present invention belongs.

[0158] Mapping section 403 maps the UL signals generated in the transmission signal generation section 402 to specific radio resources based on commands from control section 401, and transmits them to the transmission / reception sections 203. Mapping section 403 may be a mapper, a mapping circuit, or a mapping apparatus, as may be described based on a general understanding of the technical field to which the present invention pertains.

[0159] The received signal processing section 404 performs reception processes (e.g., demapping, demodulation, decoding, and so on) on DL signals (DL data signals, scaling information, DL control signals, and DL reference signals). The received signal processing section 404 transmits the information received from base radio station 10 to control section 401. The received signal processing section 404 transmits, for example, broadcast information, system information, upper-layer control information via upper-layer signaling such as RRC signaling, and physical-layer control information (L1 / L2 control information), and so on, to control section 401.

[0160] The received signal processing section 404 may consist of a signal processor, a signal processing circuit, or a signal processing apparatus that can be described based on a general understanding of the technical field to which the present invention pertains. Furthermore, the received signal processing section 404 may constitute a receiving section according to the present invention. Petition 870200126267, dated 06 / 10 / 2020, pp. 47 / 68 41 / 56

[0161] Measurement section 405 measures channel states based on reference signals (e.g., CSI-RSs) from base station 10 and transmits the measurement results to control section 401. In addition, channel state measurements can be conducted via DC.

[0162] The measuring section 405 may consist of a signal processor, a signal processing circuit or signal processing apparatus, and a meter, a measuring circuit or measuring apparatus which may be described based on a general understanding of the technical field to which the present invention pertains. <Estrutura de Hardware>

[0163] It is worth noting that the block diagrams used to describe the above embodiments show blocks in functional units. These functional blocks (components) can be implemented in arbitrary combinations of hardware and / or software. Furthermore, the method for implementing each functional block is not particularly limited. That is, each functional block can be realized by a physically and / or logically aggregated device part, or it can be realized by directly and / or indirectly connecting two or more physically and / or logically separate device parts (wired and / or wirelessly, for example) and using this plurality of device parts.

[0164] For example, a base radio station, a user terminal, and so forth, according to an embodiment of the present invention, may function as a computer that executes the processes of the radiocommunication method of the present invention. FIG. 12 is a diagram to show an example of a hardware structure of the base radio station and the user terminal according to an embodiment of the present invention. Physically, the base radio stations 10 and the user terminals 20 described Petition 870200126267, dated 06 / 10 / 2020, pages 48 / 68 42 / 56 above can each be formed as a computer apparatus including a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007 and so on.

[0165] It is worth noting that, in the following description, the word apparatus can be interpreted as circuit, device, unit, and so on. The hardware structure of the base radio station 10 and the user terminals 20 may be designed to include one or a plurality of apparatus shown in the drawings, or it may be designed to not include some of the apparatus parts.

[0166] For example, although only one 1001 processor is shown, a plurality of processors can be provided. Furthermore, processes can be implemented with one processor, or they can be implemented simultaneously, sequentially, or in different ways, with one or more processors. It is worth noting that the 1001 processor can be implemented with one or more chips.

[0167] Each function of the base radio station 10 and the user terminals 20 is implemented, for example, by allowing certain software (programs) to be read into hardware such as the processor 1001 and memory 1002, and by allowing the processor 1001 to perform calculations to control communication via the communication device 1004 and to read and / or record data in memory 1002 or storage 1003.

[0168] Processor 1001 controls the entire computer by running, for example, an operating system. Processor 1001 can be configured with a central processing unit (CPU), which includes interfaces with peripheral devices, control devices, computing devices, a register, and so on. For example, the signal processing section. Petition 870200126267, dated 06 / 10 / 2020, pp. 49 / 68 43 / 56 of baseband described above 104 (204), the call processing section 105 and so on can be implemented by processor 1001.

[0169] Furthermore, processor 1001 reads programs (program codes), software modules, data, and so on from storage 1003 and / or communication device 1004, into memory 1002, and executes various processes accordingly. As for programs, programs are used to enable computers to perform at least some of the operations described above. For example, the control section 401 of each user terminal 20 can be implemented by control programs that are stored in memory 1002 and that operate on processor 1001, and other functional blocks can be implemented in the same way.

[0170] Memory 1002 is a computer-readable recording medium and may consist, for example, of at least one ROM (read-only memory), one EPROM (erasable programmable ROM), one EEPROM (electrically erasable EPROM), one RAM (random access memory) and other suitable storage medium. Memory 1002 may be referred to as a register, a cache, a main memory (primary storage device) and so forth. Memory 1002 may store executable programs (program codes), software modules and so forth to implement the radio communication methods according to embodiments of the present invention.

[0171] Storage 1003 is a computer-readable recording medium and may consist, for example, of at least one floppy disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (CD-ROM (compact disk ROM) and so on), a disk Petition 870200126267, dated 06 / 10 / 2020, pages 50 / 68 44 / 56 versatile digital, a Blu-ray disc (registered trademark), a removable disk, a hard disk drive, a smartcard, a flash memory device (e.g., a card, a stick, and a key drive), a magnetic stripe, a database, a server, and / or other suitable storage medium. Storage 1003 may be referred to as a secondary storage device.

[0172] The communication device 1004 is a hardware (transmission / reception device) for enabling inter-computer communication via wired and / or wireless networks, and may be referred to as, for example, a network device, a network controller, a network card, a communication module, and so forth. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and so forth, in order to perform, for example, frequency division duplexing (FDD) and / or time division duplexing (TDD). For example, the transmission / reception antennas 101 (201), amplification sections 102 (202), transmission / reception sections 103 (203), communication path interface 106, and so forth described above may be implemented by the communication device 1004.

[0173] Input device 1005 is an input device that receives inputs from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, and so on). Output device 1006 is an output device that allows sending outputs to the outside (e.g., a display, a speaker, an LED (light-emitting diode) lamp, and so on). It is worth noting that input device 1005 and output device 1006 can be provided in an integrated structure (e.g., a touch-sensitive panel). Petition 870200126267, dated 06 / 10 / 2020, pp. 51 / 68 45 / 56

[0174] Furthermore, these types of devices, including the processor 1001, the memory 1002 and others, are connected by a bus 1007 for information communication. The bus 1007 can be formed with a single bus or it can be formed with buses that vary between the parts of the devices.

[0175] In addition, the base radio station 10 and the user terminals 20 can be structured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and so on, and all or part of the functional blocks can be implemented by the hardware. For example, the processor 1001 can be implemented with at least one of these hardware parts. (Variations)

[0176] It is worth noting that the terminology used in this descriptive report and / or the terminology necessary to understand this descriptive report may be replaced by other terms that convey the same or similar meanings. For example, channels and / or symbols may be replaced by signals (or signaling). In addition, signals may be messages. A reference signal may be abbreviated as an RS and may be referred to as a pilot, a pilot signal, and so on, depending on which standard applies. Furthermore, a component carrier (CC) may be referred to as a cell, a frequency carrier, a carrier frequency, and so on.

[0177] Furthermore, a radio schedule may consist of one or a plurality of periods (frames) in the time domain. Each one or a plurality of periods (frames) that constitute a radio schedule may Petition 870200126267, dated 06 / 10 / 2020, pp. 52 / 68 46 / 56 can be referred to as a subframe. Furthermore, the subframe can consist of one or a plurality of slots in the time domain. A subframe can be a fixed duration (e.g., 1 ms) independent of numerology.

[0178] Furthermore, a slot may consist of one or a plurality of time-domain symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols), SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, and so on). Moreover, a slot may be a numerology-based unit of time. A slot may include a plurality of minislots. Each minislot may consist of one or a plurality of time-domain symbols. A minislot may be referred to as a subslot.

[0179] A radio frame, a subframe, a slot, a minislot, and a symbol all express units of time in signal communication. A radio frame, a subframe, a slot, a minislot, and a symbol can each be referred to by other applicable terms. For example, a subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as a TTI, or a slot or minislot may be referred to as a TTI. That is, a subframe and / or a TTI may be a subframe (1 ms) in existing LTE, may be a period shorter than 1 ms (e.g., from 1 to 13 symbols), or may be a period longer than 1 ms. It is worth noting that the unit expressing TTI may be referred to as a slot, a minislot, and so on, instead of a subframe.

[0180] Here, a TTI refers to the minimum time unit of scaling in radiocommunication, for example. For instance, in LTE systems, a base radio station scales the allocation of radio resources (such as frequency bandwidth and transmission power). Petition 870200126267, dated 06 / 10 / 2020, pp. 53 / 68 47 / 56 available for each user terminal) for the user terminal in TTI units. It is worth noting that the definition of TTIs is not limited to this.

[0181] TTIs can be transmission time units for channel-encoded data packets (transport blocks), code blocks and / or codewords, or they can be the processing unit in scheduling, link adaptation and so on. It is worth noting that, when TTIs are given, the time interval (e.g., the number of symbols) in which the transport blocks, code blocks and / or codewords are actually mapped can be shorter than the TTIs.

[0182] It is worth noting that, in the case where 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 the minimum scheduling time unit. Furthermore, the number of slots (the number of minislots) that constitute the minimum scheduling time unit may be controlled.

[0183] A TTI with a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8 to Rel. 12), a long TTI, a normal subframe, a long subframe, and so on. A TTI shorter than a normal TTI may be referred to as a “shortened TTI”, a “short TTI”, a “partial or fractional TTI”, a “shortened subframe”, a “short subframe”, a “minislot”, a “subslot”, and so on.

[0184] It is worth noting that a long TTI (e.g., a normal TTI, a subframe, and so on) can be interpreted as a TTI with a duration exceeding 1 ms, and a short TTI (e.g., a shortened TTI, and so on) can be interpreted as a TTI with a TTI length shorter than the TTI length of a long TTI and equal to or longer than 1 ms. Petition 870200126267, dated 06 / 10 / 2020, pp. 54 / 68 48 / 56

[0185] A feature block (RB) is the unit 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, an RB may include one or a plurality of symbols in the time domain, and may have a slot, a minislot, a subframe, or a TTI of length. Each TTI and each subframe may consist of one or a plurality of feature blocks. It is worth noting that one or a plurality of RBs may be referred to as a physical feature block (PRB (Physical RB)), a subcarrier group (SCG), a feature element group (REG), a PRB pair, an RB pair, and so on.

[0186] In addition, a feature block may consist of one or a plurality of feature elements (REs). For example, an RE may correspond to a radio feature field of a subcarrier and a symbol.

[0187] It is worth noting that the radio frame, subframe, slot, minislot, symbol, and other item structures described above are merely examples. For instance, structures 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, the symbol length, the cyclic prefix (CP) length, and so on, can be altered in various ways.

[0188] In addition, the information, parameters and so forth described in this descriptive report may be represented in absolute values ​​or in relative values ​​with respect to certain values, or may be Petition 870200126267, dated 06 / 10 / 2020, pp. 55 / 68 49 / 56 represented in other corresponding information. For example, radio features can be specified by certain indices.

[0189] The names used for parameters and so forth in this descriptive report are by no means limiting. For example, since various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), and so forth) and information elements may be identified by any suitable name, the various names assigned to these individual channels and information elements are not limiting.

[0190] The information, signals and / or other elements described in this descriptive report may be represented using a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips and so forth, all of which may be referenced throughout the descriptive report contained in the present invention, may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons or any combination thereof.

[0191] Furthermore, information, signals, and so forth can be sent from upper layers to lower layers and / or from lower layers to upper layers. Information, signals, and so forth can be received and / or sent through a plurality of network nodes.

[0192] The information, signals, and so on that are entered and / or emitted can be stored in a specific location (e.g., in memory) or can be managed using a management table. The information, signals, and so on to be entered and / or emitted can be replaced, updated, or appended. The Petition 870200126267, dated 06 / 10 / 2020, pages 56 / 68 50 / 56 information, signals, and so on, that are sent can be deleted. The information, signals, and so on that are received can be transmitted to another device.

[0193] Information reporting is by no means limited to the aspects / modalities described in this descriptive report, and other methods may also be used. For example, information reporting may be implemented using physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), upper layer signaling (e.g., RRC (radio resource control) signaling), broadcast information (master information block (MIB), system information blocks (SIBs), and so on), MAC (medium access control) signaling, and so on), and other signals and / or combinations thereof.

[0194] It is worth noting that physical layer signaling may be referred to as “L1 / L2 control information (layer 1 / layer 2) (L1 / L2 control signals)”, “L1 control information (L1 control signal)”, and so on. Furthermore, RRC signaling may be referred to as an RRC message and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, and so on. Additionally, MAC signaling may be reported using, for example, MAC control elements (MAC CEs).

[0195] Furthermore, the reporting of certain information (for example, the reporting that “X holds”) does not necessarily need to be reported explicitly, and can be reported implicitly (for example, by not reporting that specific information or by reporting other pieces of information). Petition 870200126267, dated 06 / 10 / 2020, pages 57 / 68 51 / 56

[0196] Determinations can be made using values ​​represented by a bit (0 or 1), they can be made using boolean values ​​representing true or false, or they can be made by comparing numerical values ​​(for example, comparison with a certain value).

[0197] Software, whether referred to as software, firmware, middleware, microcode, or hardware description language, or called by other terms, should be interpreted broadly as instructions, instruction sets, code, code segments, program codes, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so forth.

[0198] Furthermore, software, commands, information, and so forth, can be transmitted and received via communication media. For example, when software is transmitted from a site, server, or other remote sources using wired technologies (coaxial cables, fiber optic cables, twisted-pair cables, digital subscriber lines (DSL), and so forth) and / or wireless technologies (infrared radiation, microwaves, and so forth), these wired and / or wireless technologies are also included in the definition of communication media.

[0199] The terms system and network, as used in the present invention, are used interchangeably.

[0200] In this descriptive report, the terms base station (BS), radio base station, eNB, gNB, cell, sector, cell group, carrier, and component carrier may be used interchangeably. A base station may be referred to as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, point Petition 870200126267, dated 06 / 10 / 2020, pages 58 / 68 52 / 56 reception, "transmission reception point", femtocell, small cell, and so on.

[0201] A base station may accommodate one or a plurality (e.g., three) of cells (also referred to as sectors). When a base station accommodates a plurality of cells, the entire coverage area of ​​the base station may be partitioned into multiple smaller areas, and each smaller area may provide communication services through base station subsystems (e.g., small indoor base stations (RRHs (Remote Radio Heads))). The term “cell” or “sector” refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0202] In this descriptive report, the terms mobile station (MS), user terminal, user equipment (UE), and terminal may be used interchangeably.

[0203] A mobile station may be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, “wireless device”, wireless communication device”, “remote device”, “mobile subscriber station”, “access terminal”, “mobile terminal”, “wireless terminal”, “remote terminal”, “portable device”, “user agent”, mobile client, client or other appropriate terms in some cases.

[0204] A base station and / or mobile station may also be referred to as a transmitting apparatus, receiving apparatus, and so forth.

[0205] Furthermore, the base radio stations contained in this descriptive report can be interpreted as user terminals. For example, each aspect / modality of the present invention can be applied to a configuration in which communication between a base radio station and a Petition 870200126267, dated 06 / 10 / 2020, pp. 59 / 68 53 / 56 user terminals are replaced by communication between a plurality of user terminals (D2D (device-to-device)). In this case, the 20 user terminals can have the functions of the 10 base radio stations described above. Furthermore, expressions such as uplink and downlink can be interpreted as sidelinks. For example, an uplink channel can be interpreted as a sidelink channel.

[0206] Similarly, the user terminals contained in this descriptive report can be interpreted as base radio stations. In this case, base radio stations 10 can have the functions of user terminals 20 described above.

[0207] Actions described in this descriptive report to be performed by the base station may, in some cases, be performed by higher-level nodes. In a network including one or a plurality of network nodes with base stations, it is clear that various operations performed to communicate with terminals may be performed by base stations, one or more network nodes (e.g., MMEs (mobility management entities), S-GWs (gateway servers), and so on, may be possible, but are not limiting), in addition to base stations, or combinations thereof.

[0208] The aspects / modalities illustrated in this descriptive report can be used individually or in combinations, which can be altered depending on the implementation method. The order of the processes, sequences, flowcharts, and so on that were used to describe the aspects / modalities contained in the present invention can be rearranged as long as no inconsistencies arise. For example, although several methods have been illustrated in this descriptive report with various Petition 870200126267, dated 06 / 10 / 2020, pages 60 / 68 54 / 56 step components in exemplary orders, the specific orders illustrated in the present invention are by no means limiting.

[0209] The aspects / modalities illustrated in this descriptive report can be applied to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), Nova-RAT (Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (Future Generation Radio Access), GSM (registered trademark) (Global System for Mobile Communications), CDMA 2000, UMB (Ultra Wideband Mobile), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra Wideband), Bluetooth (trademark) registered), systems that use other suitable radiocommunication methods and / or next-generation systems that are improved upon these.

[0210] The phrase “based on” (or based on”), as used in this descriptive report, does not mean “based solely on” (or based only on”), unless otherwise specified. In other words, the phrase “based on” (or based on) means both “based solely on” and “based at least on” (based only on and based at least on).

[0211] Reference to elements with designations such as first, second, and so forth, as used in the present invention, generally does not limit the quantity or order of these elements. These designations may be used in the present invention only for convenience, as a method of distinguishing between two or more elements. Thus, reference to the first and second elements does not imply that only two Petition 870200126267, dated 06 / 10 / 2020, pages 61 / 68 55 / 56 elements can be used or the first element must precede the second element in some way.

[0212] The term "judge (determine)," as used in the present invention, can encompass a wide variety of actions. For example, "judge (determine)" can be interpreted as meaning "making judgments (determinations)" related to calculation, computation, processing, derivation, investigation, consultation (e.g., searching a table, a database, or some other data structure), verification, and so forth. Furthermore, "judge (determine)" can be interpreted as meaning "making judgments (determinations)" related to reception (e.g., receiving information), transmission (e.g., transmitting information), input, output, access (e.g., accessing data in memory), and so forth. In addition, "judge (determine)," as used in the present invention, can be interpreted as meaning "making judgments (determinations)" related to resolution, selection, choice, establishment, comparison, and so forth.In other words, to judge (determine) can be interpreted as meaning to make judgments (determinations) related to some action.

[0213] The terms connected and coupled, or any variation of these terms as used in the present invention, mean all direct or indirect connections or couplings between two or more elements, and may include the presence of one or more intermediate elements between two elements that are connected or coupled to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, connection may be interpreted as access.

[0214] In this descriptive report, when two elements are connected, the two elements can be considered mutually connected or Petition 870200126267, dated 06 / 10 / 2020, pages 62 / 68 56 / 56 coupled by the use of one or more electrical wires, cables and / or printed electrical connections and, as some non-limiting and non-inclusive examples, by the use of electromagnetic energy with wavelengths in radio frequency regions, microwave regions, optical regions (both visible and invisible), or similar regions.

[0215] In this descriptive report, the phrase A and B are different can mean A and B are different from each other. The terms separate, be coupled, and so on can be interpreted similarly.

[0216] When terms such as including, comprising and their variations are used in this descriptive report or in the claims, these terms shall be inclusive, in a manner similar to how the term provide is used. Furthermore, the term or, as used in this descriptive report or in the claims, is not intended to be an exclusive disjunction.

[0217] Now, although the present invention has been described in detail above, it should be evident to a person skilled in the art that the present invention is in no way limited to the embodiments described in the present invention. The present invention can be implemented with various corrections and in various modifications, without departing from the spirit and scope of the present invention, as defined by the recitations of the claims. Therefore, the descriptive report contained in the present invention is provided only for the purpose of explaining examples and should not, in any way, be interpreted as limiting the present invention in any manner. Petition 870200126267, dated 06 / 10 / 2020, pp. 63 / 68

Claims

1 / 3 CLAIMS 1. Terminal (20) characterized in that it comprises: a receiver that receives fallback-related information from an uplink control channel; a control section (401) that controls a format of the uplink control channel used for transmission of uplink control information (UCI), based on the fallback-related information;and a transmitter that transmits UCIs based on the uplink control channel format using at least one of a first-duration uplink control channel over a first number of symbols and a second-duration uplink control channel over a second number of symbols, wherein the second duration is longer than the first duration, wherein, when the control section (401) performs fallback to the first-duration uplink control channel format and when the UCIs to be transmitted include HARQ-ACK of up to 2 bits, the transmitter transmits the HARQ-ACK by the first-duration uplink control channel format and the transmitter does not transmit channel state information (CSI).

2. Radio communication method for a terminal (20) characterized in that it comprises: receiving fallback-related information from an uplink control channel; controlling a format of the uplink control channel used for transmission of uplink control information (UCI), based on fallback-related information; and Petition 870240093227, dated 10 / 31 / 2024, p.12 / 14 2 / 3 transmit the UCI based on the uplink control channel format using at least one of a first duration uplink control channel over a first number of symbols and a second duration uplink control channel over a second number of symbols, wherein the second duration is longer than the first duration, wherein, when terminal (20) performs fallback to the first duration uplink control channel format and when the UCI to be transmitted include HARQ-ACK of up to 2 bits, terminal (20) transmits the HARQ-ACK by the first duration uplink control channel format and terminal (20) does not transmit channel state information (CSI).

3. Base station (10) characterized in that it comprises: a transmitter that transmits fallback-related information from an uplink control channel; and a receiver that receives uplink control information (UCI) based on an uplink control channel format using at least one of a first-duration uplink control channel over a first number of symbols and a second-duration uplink control channel over a second number of symbols, wherein the second duration is longer than the first duration, wherein the uplink control channel format used for UCI transmission is controlled based on fallback-related information, wherein, when a terminal (20) performs fallback to the first-duration uplink control channel format and when the UCI to be transmitted includes HARQ-ACK of up to 2 bits,The receiver receives the HARQ Petition 870240093227, dated 10 / 31 / 2024, p. 13 / 14 3 / 3 ACK via the uplink control channel format of the first duration, and the receiver does not receive channel state information (CSI). Petition 870240093227, dated 10 / 31 / 2024, p. 14 / 14,

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