Terminal and radiocommunication method for a terminal

Abstract

User terminal and radio communication method: The present invention is designed so that UL control information can be properly reported in future radio communication systems. A user terminal includes a control section that controls the mapping of a UL signal that is generated using a scatter code feature that is associated with a UL control information value, to a plurality of time features; and a transmission section that transmits the UL signal.

Description

1 / 71 TERMINAL AND RADIOCOMMUNICATION METHOD FOR A TERMINAL Technical Field

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

[002] In the UMTS (Universal Mobile Telecommunications System) network, long-term evolution (LTE) specifications were developed with the purpose of further increasing high-speed data rates, providing lower latency and so on (see non-patent literature 1). Furthermore, LTE-A specifications (also referred to as LTE-advanced, “LTE Rel. 10”, “LTE Rel. 11” or “LTE Rel. 12”) were developed for greater broadbandization and higher speeds beyond LTE (also referred to as “LTE Rel. 8” or “LTE Rel. 9”), and successor LTE systems (also referred to as, for example, “FRA (Future Radio Access)”, “5G (5th generation mobile communication system)”, “5G+ (plus)”, “NR (New Radio)”, “NX (New Radio Access)”, “FX (Future Generation Radio Access)”, “LTE Rel. 13”, “LTE Rel. 14”, “LTE Rel. 15” or later versions) are under study.

[003] In existing LTE systems (e.g., LTE Rel. 8 to 13), downlink (DL) and / or uplink (UL) communication is performed using 1 ms subframes (also referred to as “transmission time intervals (TTIs)” and so on). This subframe is the unit of time it takes to transmit a channel-encoded data packet and is the unit of processing, e.g., scheduling, link adaptation, retransmission control (HARQ (Hybrid Automatic Repeat Request)) and so on.

[004] In addition, in existing LTE systems (e.g., LTE Rel. 8 to 13), a user terminal (UE (User Equipment)) transmits information Petition 870190097492, dated 09 / 30 / 2019, page 10 / 84 2 / 71 uplink control (UCI) using a UL control channel (e.g., PUCCH (Uplink Physical Control Channel)) and / or a UL data channel (e.g., PUSCH (Uplink Shared Physical Channel)). The format of this UL control channel is referred to as “PUCCH format” and so on.

[005] UCI contains at least one escalation request (SR), retransmission control information in response to DL data (DL data channel (PDSCH (Physical Shared Downlink Channel)) (also referred to as “HARQ-ACK (Hybrid Automatic Repeat Request Receipt Acknowledgment)”, “ACK”, “NACK (Negative ACK)” and so on) and channel status information (CSI). List of citations Non-Patent Literature

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

[007] Future radiocommunication systems (e.g., 5G, NR, etc.) are expected to provide various radiocommunication services to meet mutually varying requirements (e.g., ultra-high speed, large capacity, ultra-low latency, etc.).

[008] For example, NR is studying providing radio communication services referred to as eMBB (Enhanced Mobile Broadband), mMTC (Massive Machine Type Communication), URLLC (Ultra Reliable Low Latency Communications) and so on. Petition 870190097492, dated 09 / 30 / 2019, page 11 / 84 3 / 71

[009] Furthermore, in LTE / NR, studies are underway to use UL control channels of various formats (UL control channel formats). When applying UCI transmission methods in existing LTE systems (LTE Rel. 13 or earlier versions) to these future radio communication systems, there is a risk that coverage, data transfer rate and / or other aspects may deteriorate.

[0010] 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 radiocommunication method by which UL control information can be properly reported in future radiocommunication systems. Solution to the problem

[0011] A user terminal according to one aspect of the present invention has a control section that controls the mapping of a UL signal, which is generated using a spreading code feature that is associated with the value of the UL control information, a plurality of timing features, and a transmission section that transmits the UL signal. Advantageous effects of the invention

[0012] According to the present invention, UL control information can be properly reported in future radio communication systems. Brief description of the drawings

[0013] Figures 1A and 1B are diagrams, each showing an example of a short PUCCH format in future radiocommunication systems; Figures 2A and 2B are diagrams, each showing an example of a long PUCCH format in future radiocommunication systems; Figures 3A to 3D are diagrams to show examples of PUCCH formats in link cost calculation; Petition 870190097492, dated 09 / 30 / 2019, page 12 / 84 4 / 71 Figure 4 is a diagram to show examples of link cost calculation results; Figures 5A and 5B are diagrams to show the relationships between the number of PUCCH symbols and the number of data symbols; Figures 6A and 6B are diagrams to show examples of sets of phase rotation quantities; Figure 7 is a diagram to show an example of a sequence-based PUCCH; Figures 8A to 8D are diagrams to show examples of sequence-based PUCCH transmission signal generation processes; Figures 9A and 9B are diagrams to show examples of PUCCH based on DMRS; Figure 10 is a diagram to show an example of a sequence-based PUCCH that extends across multiple symbols; Figure 11 is a diagram to show an example of a sequence-based PUCCH to which frequency hopping is applied; Figures 12A to 12C are diagrams to show examples of PUCCHs to which symbol division is applied; Figures 13A to 13C are diagrams to show examples of PUCCHs that extend by two symbols; Figure 14 is a diagram to show examples of BER performance of PUCCHs; Figure 15 is a diagram to show an example of the sequence-based PUCCH multiplexing method; Figures 16A and 16B are diagrams to show examples of sequence-based PUCCHs that use the combination of the time / frequency feature and the amount of phase rotation; Petition 870190097492, dated 09 / 30 / 2019, p. 13 / 84 5 / 71 Figures 17A to 17D are diagrams to show examples of sequence-based PUCCHs, where the base sequence reports two bits and the phase rotation amount reports two bits; Figures 18A and 18B are diagrams to show examples of sequence-based PUCCHs, where the base sequence and the amount of phase rotation are combined to report four bits; Figures 19A and 19B are diagrams to show an example of a sequence-based PUCCH that is multiplexed over the DMRS of another UE TDM-based PUCCH DMRS; Figures 20A and 20B are diagrams to show an example of a sequence-based PUCCH that is multiplexed over the DMRS of another UE FDM-based PUCCH DMRS; Figures 21A and 21B are diagrams to show an example of a sequence-based PUCCH that is multiplexed with respect to another UE TDM DMRS-based PUCCH; Figures 22A and 22B are diagrams to show an example of a sequence-based PUCCH that is multiplexed with respect to another UE DMRS FDM-based PUCCH; Figures 23A and 23B are diagrams to show the formats of an FDM DMRS-based PUCCH and a sequence-based PUCCH in the case of a reported two-bit UCI; Figures 24A and 24B are diagrams to show sets of phase rotation quantities for a DMRS-based PUCCH and a sequence-based PUCCH in the case of a reported two-bit UCI; Figures 25A and 25B are diagrams to show the formats of an FDM-based DMRS PUCCH and a sequence-based PUCCH in the case of a reported four-bit UCI; Petition 870190097492, dated 09 / 30 / 2019, page 14 / 84 6 / 71 Figures 26A and 26B are diagrams to show spread code features for sequence-based PUCCHs in the case of a reported four-bit UCI; Figure 27 is a diagram to show an example of a schematic structure of a radio communication system according to an embodiment of the present invention; Figure 28 is a diagram to show an example of a global structure of a radio base station according to an embodiment of the present invention; Figure 29 is a diagram to show an example of a functional structure of a radio base station according to an embodiment of the present invention; Figure 30 is a diagram to show an example of a global structure of a user terminal according to an embodiment of the present invention; Figure 31 is a diagram to show an example of a functional structure of a user terminal according to an embodiment of the present invention; and Figure 32 is a diagram to show an example of the hardware structure of a base radio station and a user terminal according to an embodiment of the present invention. Description of the modalities

[0014] Future radiocommunication systems (e.g., LTE Rel. 14, 15 and / or later versions, 5G, NR, etc.) are being studied to introduce multiple numerologies, not a single numerology.

[0015] Note that numerology can refer to a set of communication parameters that characterize the design of signals in a given RAT. Petition 870190097492, dated 09 / 30 / 2019, p. 15 / 84 7 / 71 (Radio Access Technology), the RAT project and so on, or refer to parameters that relate to frequency direction and / or time direction, such as subcarrier spacing (SCS), symbol duration, cyclic prefix duration, subframe duration and so on.

[0016] Furthermore, future radio communication systems are being studied to introduce time units (also referred to as subframes, “slots”, “mini slots”, “sub slots”, “transmission time intervals (TTIs)”, “short TTIs”, “radio frames”, and so on) that are the same as and / or different from existing LTE systems (LTE Rel. 13 or earlier versions), supporting multiple numerologies, and so on.

[0017] Note that TTIs can represent time units in which transport blocks, code blocks, and / or data codewords are transmitted and received. When a TTI is provided, the time period (e.g., the number of symbols) in which a transport block, code block, and / or data codeword is actually mapped may be shorter than the TTI.

[0018] For example, when a given number of symbols (e.g., fourteen symbols) constitutes a TTI, the data transmission / reception transport block, code block, and / or codeword may be transmitted and received in a period of one or a given number of symbols within the constituent symbols. If the number of symbols in which a data transmission / reception transport block, code block, and / or codeword is transmitted and / or received is less than the number of symbols constituting a TTI, reference signals and / or others may be mapped to symbols in the TTI where no data is mapped.

[0019] Subframes can serve as time units that have a defined time duration (e.g., 1 ms), regardless of Petition 870190097492, dated 09 / 30 / 2019, p. 16 / 84 8 / 71 which numerology is used by (and / or configured on) a user terminal (e.g., UE (User Equipment)).

[0020] In contrast to this, slots can serve as time units that depend on the numerology used by the UE. For example, if the subcarrier spacing is 15 kHz or 30 kHz, the number of symbols per slot could be seven or fourteen. When the subcarrier spacing is 60 kHz or higher, the number of symbols per slot could be fourteen. In addition, a slot can contain a plurality of mini slots (sub slots).

[0021] Generally, subcarrier spacing and symbol length have a reciprocal relationship. Therefore, as long as the number of symbols per slot (or mini-slot (sub-slot)) is the same, the larger (wider) the subcarrier spacing, the shorter the slot length, and the smaller (narrower) the subcarrier spacing, the longer the slot length. Note that "high subcarrier spacing" can be paraphrased as "wide subcarrier spacing" and "low subcarrier spacing" can be paraphrased as "narrow subcarrier spacing".

[0022] For such future radiocommunication systems, a study is underway to support a UL control channel (hereinafter also referred to as a “short PUCCH”) that is structured to have a shorter duration than the PUCCH (Uplink Physical Control Channel) formats for existing LTE systems (e.g., LTE Rel. 8 to 13) and / or a UL control channel (hereinafter also referred to as a “long PUCCH”) that is structured to have a longer duration than the short duration above.

[0023] A short PUCCH (also referred to as a shortened PUCCH) is formed with a given number of symbols (for example, a symbol Petition 870190097492, dated 09 / 30 / 2019, page 17 / 84 9 / 71 or two symbols) of a given SCS. In this short PUCCH, the uplink control information (UCI) and reference signals (RSs) can be time-division multiplexed (TDM) or frequency-division multiplexed (FDM). The RSs can be, for example, the demodulation reference signal (DMRS), which is used to demodulate the UCI.

[0024] The SCS for each short PUCCH symbol may be equal to or greater than the SCS for data channel symbols (hereinafter also referred to as “data symbols”). Data channels may be, for example, a downlink data channel (PDSCH (Downlink Shared Physical Channel)), an uplink data channel (PUSCH (Uplink Shared Physical Channel)), and so on.

[0025] A short PUCCH may be referred to as a “PUCCH with a higher (larger, wider, etc.) SCS” (e.g., 60 kHz). Note that the time unit in which a short PUCCH is transmitted may be referred to as a short TTI.

[0026] In a short PUCCH, a multicarrier waveform (e.g., a cyclic prefix OFDM-based waveform (CP-OFDM (cyclic prefix orthogonal frequency division multiplexing)) can be used, or a single carrier waveform (e.g., a DFT-S-OFDM-based waveform (discrete Fourier transform spread orthogonal frequency division multiplexing)) can be used).

[0027] Note that the waveform may be referred to as a communication scheme, multiplexing scheme, modulation scheme, access scheme, waveform scheme, and so on. Furthermore, these waveforms may be characterized based on whether or not DFT precoding (spreading) is applied to the OFDM waveform. Petition 870190097492, dated 09 / 30 / 2019, p. 18 / 84 10 / 71 For example, CP-OFDM can be referred to as the waveform (signal) to which DFT precoding is not applied, and DFT-S-OFDM can be referred to as the waveform (signal) to which DFT precoding is applied. Furthermore, the waveform can also be called a waveform signal, a signal according to the waveform, a signal waveform, a signal, and so on.

[0028] Figures 1A and 1B are diagrams, each showing an example of a short PUCCH format for use in future radiocommunication systems. In these examples, a slot is formed with fourteen symbols, each having a subcarrier spacing of Δf = f0 (e.g., 15 kHz), but the number of symbols to be contained in a slot is by no means limited to this.

[0029] In figures 1A and 1B, a short PUCCH is placed (mapped) on a given number of symbols (here, one symbol or two symbols) from the end of the slot. In addition, a short PUCCH is placed on one or more frequency features (e.g., one or more physical feature blocks (PRBs)).

[0030] As shown in Figure 1A, in a short PUCCH, UCI and an RS can be time-division multiplexed (TDM) into a plurality of symbols. In this short PUCCH, UCI and an RS are placed in different symbols. A multicarrier waveform (e.g., the OFDM waveform) or a single-carrier waveform (e.g., the DFT-S-OFDM waveform) can be applied to this short PUCCH.

[0031] Meanwhile, as shown in Figure 1B, in a short PUCCH, UCI and an RS can be time-division multiplexed (TDM) over a plurality of symbols having a higher SCS (e.g., 2f0) than the SCS (= fc>) constituting the slot. In this case, within one symbol (which can be referred to as, for example, a long symbol) in the slot, multiple symbols (which can be referred to as, for example, short symbols) with a higher SCS Petition 870190097492, dated 09 / 30 / 2019, p. 19 / 84 11 / 71 larger can be placed. In this short PUCCH, UCI and RS are placed in different short symbols. A multicarrier waveform (e.g., OFDM waveform) or a single carrier waveform (e.g., DFT-S-OFDM) can be applied to this short PUCCH.

[0032] Furthermore, in one or more symbols in a short PUCCH, UCI and an RS can be frequency division multiplexed (FDM). In this short PUCCH, UCI and an RS can be placed on different frequency features (e.g., PRBs, feature units, feature elements, subcarriers, etc.). In this case, if a single carrier waveform is applied to the short PUCCH, there is a possibility that the peak-to-average power rate (PAPR) will increase, so a multicarrier waveform is preferable.

[0033] Note that although Figures 1A and 1B each show an example in which a short PUCCH is mapped to the second symbol starting at the end of a slot and / or the last symbol, the short PUCCH is by no means limited to these locations. For example, a certain number of symbols at the beginning or in the middle of the slot may serve as symbols to place the short PUCCH.

[0034] Meanwhile, a long PUCCH is placed over a plurality of symbols in the slot in order to improve coverage over the short PUCCH. In this long PUCCH, UCI and an RS (e.g., DMRS) can be time-division multiplexed (TDM) or frequency-division multiplexed (FDM). A long PUCCH can be referred to as a “PUCCH with a lower SCS (smaller, narrower, etc.)” (e.g., 15 kHz). Note that the time unit in which a long PUCCH is transmitted can be referred to as a long TTI.

[0035] A long PUCCH may consist of a number of frequency features to match a short PUCCH, or a long PUCCH may consist of a smaller number of frequency features (e.g., a Petition 870190097492, dated 09 / 30 / 2019, p. 20 / 84 12 / 71 or two PRBs) rather than a short PUCCH, to achieve a power boosting effect. Additionally, a long PUCCH can be placed with a short PUCCH in the same slot.

[0036] For a long PUCCH, a single carrier waveform (e.g., DFT-S-OFDM waveform) can be used, or a multicarrier waveform (e.g., OFDM waveform) can be used. In addition, a long PUCCH can be applied to a frequency hopping at a given period within a slot (e.g., by mini slot (sub slot)).

[0037] Note that a long PUCCH may be a PUCCH that is different from the PUCCHs (PUCCHs of different formats) stipulated in existing LTE systems (e.g., LTE Rel. 8 to 13).

[0038] Figures 2A and 2B are diagrams, each showing an example of a long PUCCH format in future radiocommunication systems. In these examples, a slot is formed with fourteen symbols, each having a subcarrier spacing of Δf = f0 (e.g., 15 kHz), but the number of symbols to be contained in a slot is by no means limited to this.

[0039] Figure 2A shows an example of a slot (UL-only slot) in which UL signals (e.g., PUSCH and / or PUCCH) are transmitted / received, and Figure 2B shows an example of a slot (UL-centered slot) in which DL signals (e.g., PDCCH) are transmitted and received on a given number of symbols (here, on the first symbol), a symbol (gap period for switching between DL and UL) is provided, and UL signals (e.g., PUSCH and / or PUCCH) are transmitted and received on the remaining symbols. Note that slots where a long PUCCH can be applied are by no means limited to UL-only slots and / or UL-centered slots.

[0040] In the UL-only slot shown in Figure 2A, a long PUCCH is placed over all fourteen symbols that make up the slot. In the short PUCCH Petition 870190097492, dated 09 / 30 / 2019, page 21 / 84 13 / 71 shown in Figure 2A, the UCI is mapped through a plurality of UCI symbols (here, ten symbols) using at least one scattering, repeating, and encoding.

[0041] In the UL-centered slot of Figure 2B, a long PUCCH is placed over twelve symbols in the slot, which are for UL signals. In the short PUCCH shown in Figure 2B, UCI is mapped through multiple UCI symbols (here, nine symbols) using at least one spreading, repeating, and encoding.

[0042] From now on, a PUCCH, when mentioned as is, may be interpreted as a short PUCCH and / or a long PUCCH.

[0043] A PUCCH can be time-division multiplexed (TDM) and / or frequency-division multiplexed (FDM) with a UL data channel (hereinafter also called PUSCH) in the slot. In addition, the PUCCH can be time-division multiplexed (TDM) and / or frequency-division multiplexed (FDM) with a DL data channel (hereinafter also referred to as PDSCH) and / or a DL control channel (hereinafter also referred to as PDCCH (Downlink Physical Control Channel)) within the slot.

[0044] In NR, the number of symbols to allocate to PUCCH (which may be referred to as PUCCH allocation symbols, PUCCH symbols, etc.) can be determined on a per-slot basis, on a per-cell basis, on a per-UE basis, or in a way that combines them. Given the general expectation that communication distance (coverage) expands in proportion to the number of PUCCH symbols, an operation may be possible where more symbols are reserved for UEs that are farther from a base station (e.g., an eNB, a gNB, etc.).

[0045] The relationship between the number of PUCCH symbols and coverage will be explained based on the results of the link cost calculation. Petition 870190097492, dated 09 / 30 / 2019, p. 22 / 84 14 / 71

[0046] The link cost calculation conditions include that the antenna format consists of one transmit antenna and two receive antennas, the carrier frequency is 4 GHz, the SCS is 15 kHz, the channel model is EPA (Pedestrian Propagation A), and the UCI payload length is two bits.

[0047] Figure 3 is a diagram to show examples of PUCCH formats in link cost calculation. Figures 3A to 3D show PUCCHs of two symbols, four symbols, twelve symbols and fourteen symbols, respectively.

[0048] In link cost calculation, BER (Bit Error Rate) performance is evaluated using these PUCCH formats, the SNR (Signal-to-Noise Ratio) required to achieve the required BER level is calculated from each evaluation result, and the communication distance (maximum distance) is calculated from the required SNR.

[0049] Figure 4 is a diagram to show an example of link cost calculation results. As shown in this drawing, when the number of PUCCH symbols increases, coverage will improve (expand).

[0050] However, when the number of PUCCH symbols is increased in order to improve coverage, the number of data symbols to be allocated to the UL / DL (data) data channels will decrease and the resource utilization efficiency (throughput capacity) will be lower.

[0051] Figures 5 are diagrams to show the relationship between the number of PUCCH symbols and the number of data symbols. Figure 5A illustrates a case where the number of PUCCH symbols is configured to be one of two, four, and six. Thus, when the number of PUCCH symbols is small, the number of data symbols is large, so the resource utilization efficiency is high. Figure 5B shows a case where the number of PUCCH symbols Petition 870190097492, dated 09 / 30 / 2019, page 23 / 84 15 / 71 is configured to be one of four, six, ten, and thirteen. Thus, as the number of PUCCH symbols increases, the number of data symbols will decrease, so the efficiency of resource utilization will be lower.

[0052] Thus, the present inventors have worked on a method to lower the required SNR of the PUCCH and expand coverage, avoiding an increase in the number of PUCCH symbols, and arriving at the present invention. According to one aspect of the present invention, UL signals are generated using spread code features, which are associated with UL control information values, and mapped to a plurality of timing features, so that it is possible to lower the required SNR compared to when PUCCH contains reference and UCI signals.

[0053] Now, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the radiocommunication methods according to these embodiments can be applied individually or can be applied in combination.

[0054] In each of the following modalities, a symbol can signify a symbol (time resource) that assumes a particular numerology (for example, a particular SCS).

[0055] (Radio Communication Method)<Primeira Modalidade> According to a first embodiment of the present invention, the UE can report UCI via sequence-based transmission. In sequence-based transmission, the UCI is reported in a PUCCH (sequence-based PUCCH) that does not contain RS for use in demodulating UCI, so sequence-based transmission can be referred to as “non-coherent transmission”, “non-coherent design” and / or the like.

[0056] For example, multiple candidates for transmission resources Petition 870190097492, dated 09 / 30 / 2019, p. 24 / 84 16 / 71 for sequence-based transmission are associated, respectively, with multiple candidate values ​​of information that is reported (e.g., UCI). Transmission features may include spread code features that can be code division multiplexed (CDM). For example, spread code features may be at least one of a base sequence, the amount of phase rotation (cyclic shift), and an OCC (Orthogonal Cover Code).

[0057] A plurality of candidates for transmission resources is provided from the network (e.g., a base radio station) to the UE. Information to represent multiple candidates can be reported from the network to the UE via upper-layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (the MIB (Master Information Block), SIBs (System Information Blocks), etc.), physical-layer signaling (e.g., DCI), or a combination thereof. This allows the network to allocate resources for sequence-based PUCCHs to multiple UEs.

[0058] The UE may select a resource out of multiple candidates, depending on the UCI value that is reported, and transmit the sequence-based PUCCH using the selected resource.

[0059] Here, a case will be explained where the transmission feature is the phase rotation quantity. A plurality of candidate phase rotation quantities that are assigned to a UE can be referred to as a “phase rotation quantity set”. Although a case is assumed here where the number of subcarriers, M, for use in a sequence-based PUCCH is twelve (in other words, a case where a PRB is used for a sequence-based PUCCH), this is by no means limiting.

[0060] The length of a base sequence used Petition 870190097492, dated 09 / 30 / 2019, p. 25 / 84 17 / 71 for a sequence-based PUCCH is determined by the number of subcarriers M and the number of PRBs. In this case, one PRB is assumed, so the length of the base sequence is 12 (= 12 x 1). In this case, twelve phase rotation quantities αο a an, given in phase intervals of 2π / 12, are presented. The twelve sequences, obtained by applying phase rotation (cyclic shift) to a base sequence based on phase rotation quantities αο a an, are individually orthogonal to each other (with zero cross-correlation). Note that phase rotation quantities αο a an can be determined by at least one of the number of subcarriers M, the number of PRBs, and the length of the base sequence. The set of phase rotation quantities can be composed of two or more phase rotation quantities that are selected from phase rotation quantities αο a an.

[0061] Figures 6 provide diagrams to show examples of phase rotation quantity sets. The length of the UCI here is two bits. Since the two-bit UCI can take four values, a phase rotation quantity set contains four phase rotation quantities.

[0062] The set of phase rotation quantities for sequence type (0) shown in Figure 6A consists of a plurality of neighboring (continuous) phase rotation quantities. This set of phase rotation quantities includes four phase rotation quantities α0, α1, α2, and α3, each spaced by π / 6. The set of phase rotation quantities for sequence type (1) shown in Figure 6B consists of a plurality of phase rotation quantities that are distant from each other. In this set of phase rotation quantities, the gap between two neighboring phase rotation quantities is the largest, and four phase rotation quantities α0, α3, α6, and α9, each spaced by π / 2, are included. Petition 870190097492, dated 09 / 30 / 2019, p. 26 / 84 18 / 71

[0063] In an environment that is not very frequency-selective, both sequence type (0) and sequence type (1) produce little cross-correlation (i.e., the sequences generated from each sequence type do not interfere with each other). Therefore, in an environment that is not very frequency-selective, sequence type (0) and sequence type (1) have an equal UCI error rate. When sequence type (0) is used, twelve phase rotation quantities can be provided more densely, so that three UEs can use four phase rotation quantities, allowing for more efficient use of phase rotation quantities.

[0064] On the other hand, in an environment that is strongly frequency selective, there is a significant cross-correlation between sequences that are generated by applying neighboring amounts of phase rotation, so that the UCI produces more errors. Therefore, when frequency selectivity is strong, using sequence type (1) can decrease the UCI error rate compared to when sequence type (0) is used.

[0065] The UE can assume using sequence type (0) if the transmission bandwidth allocated to a PUCCH is equal to or greater than a given value and assume selection of sequence type (1) if the transmission bandwidth is less than the given value. By this means, the sequence type does not need to be reported from the network, but the UE can still choose the sequence type that fulfills a given error rate. Now, assume the case where, when the transmission bandwidth is greater, more phase rotation quantities will be available, but not all of them will be used. For example, if the phase rotation quantities that can be used are limited to twelve, regardless of the transmission bandwidth, and the transmission bandwidth is six PRBs, 12 x 6 = 72 phase rotation quantities can be used. Of these, only twelve phase rotation quantities are used, of Petition 870190097492, dated 09 / 30 / 2019, page 27 / 84 19 / 71 so that, even when sequence type (0) is used, the intervals between these phase rotation quantities correspond to six phase rotation quantities and therefore sequences that are generated based on neighboring phase rotation quantities in the twelve phase rotation quantities are poorly cross-correlated.

[0066] Figure 7 is a diagram to show an example of a sequence-based PUCCH. When an UE, to which the set of phase rotation quantities shown in Figure 6A is assigned, reports 11 as a two-bit UCI, the UE rotates the base sequence phase based on the corresponding α2 and generates the sequence-based PUCCH transmission signal.

[0067] Figures 8 provide diagrams, each showing an example of the PUCCH transmission signal generation process based on sequences. In the transmission signal generation process, base sequences Xo to Xm-1, with a sequence length M, are subjected to phase rotation (cyclic shift), based on the selected phase rotation quantities α, and the base sequences that have undergone phase rotation are fed into an OFDM transmitter or a DFT-S-OFDM transmitter. The UE transmits output signals from the OFDM transmitter or the DFT-S-OFDM transmitter.

[0068] When the phase rotation quantities αο to α3 are associated with UCI information 0 to 3, respectively, and information 0 is reported as UCI, as shown in Figure 8A, the UE applies phase rotation to the basis sequences Xo to Xm-1 using the phase rotation quantity αο, which is associated with information 0. Similarly, when the UE reports information 1 to 3 as UCI, the UE applies phase rotation to the basis sequences Xo to Xm-1 using the phase rotation quantities α1, α2, and α3, which are associated with information 1 to 3, as shown in Figures 8B, 8C, and 8D, respectively. Petition 870190097492, dated 09 / 30 / 2019, p. 28 / 84 20 / 71

[0069] The UE can report UCI in sequence-based transmission or DMRS-based transmission. DMRS-based transmission reports UCI in a PUCCH (DMRS-based PUCCH) that contains the DMRS to demodulate UCI and therefore can be referred to as “coherent transmission”, “coherent design”, and so on.

[0070] Figures 9 provide diagrams to show examples of DMRS-based PUCCHs. A DMRS-based PUCCH can be a TDM DMRS-based PUCCH or an FDM DMRS-based PUCCH. For example, in the TDM DMRS-based PUCCH shown in Figure 9A, a DMRS and UCI are allocated and time-division multiplexed (TDM) per symbol or per short symbol. For example, in the FDM DMRS-based PUCCH shown in Figure 9B, a DMRS and UCI are allocated and frequency-division multiplexed (FDM) per subcarrier.

[0071] The information to identify between a sequence-based PUCCH and a DMRS-based PUCCH is reported from the network to the UE via upper-layer signaling and / or physical-layer signaling, and the UE can send the PUCCH specified by this information.

[0072] In addition, the UE can select a sequence-based PUCCH or a DMRS-based PUCCH depending on the length of the UCI payload. For example, when the length of the UCI payload is four bits or less, the UE can transmit a sequence-based PUCCH, and otherwise, the UE can transmit a DMRS-based PUCCH.

[0073] The network can allocate at least one resource from a time resource, a frequency resource, and a space resource (e.g., MIMO (Multiple Input Multiple Output) layer or beam) for PUCCH. The UE can transmit sequence-based PUCCH or DMRS-based PUCCH using this resource. The combination of a time resource and a frequency resource Petition 870190097492, dated 09 / 30 / 2019, page 29 / 84 21 / 71 can be referred to as a time / frequency feature.

[0074] For example, the network can allocate a plurality of symbols for sequence-based PUCCH. The UE can map sequence-based PUCCH spanning multiple symbols by applying at least one spreading, repeating, and encoding to a UTI payload or a code corresponding to a UTI payload. By increasing the number of PUCCH symbols, it is possible to decrease the required SNR and improve coverage. Note that the UE can map sequence-based PUCCH over a plurality of time features (e.g., a plurality of short symbols).

[0075] Figure 10 is a diagram to show an example of a sequence-based PUCCH spanning multiple symbols. The sequence-based PUCCH in this example is mapped to four symbols. A set of phase rotation quantities for sequence type (0) shown in Figure 6A is assigned to the UE and, when the UCI value is “11”, the UE applies phase rotation to the α2-based base sequence and generates the sequence-based PUCCH transmission signal.

[0076] The UE can apply frequency hopping to a sequence-based PUCCH or a DMRS-based PUCCH based on given rules. Figure 11 is a diagram to show an example of a sequence-based PUCCH to which frequency hopping is applied. The sequence-based PUCCH in this example is mapped to four symbols, and frequency hopping is applied between the first two symbols and the last two symbols.

[0077] When a PUCCH symbol is assigned, the UE may extend the SCS of the PUCCH symbol further than the SCS of data symbols and split a PUCCH symbol into two short symbols. The UE may assume that when a symbol Petition 870190097492, dated 09 / 30 / 2019, page 30 / 84 22 / 71 When a PUCCH symbol is split into two short symbols, the UE applies frequency hopping to the PUCCH. This can provide frequency diversity gain. Additionally, the UE can assume that when a PUCCH symbol is split into two short symbols, frequency hopping is not applied to the PUCCH. This simplifies the resource allocation process at the base station.

[0078] The information indicating whether symbol splitting (short symbols) should be applied to PUCCH can be configured from the network to the UE. If a PUCCH symbol is allocated, the UE can assume that symbol splitting should be applied to PUCCH.

[0079] Figures 12 are diagrams to show examples of PUCCHs to which symbol division is applied. As shown in Figure 12A, when the UE applies symbol division to a sequence-based PUCCH, the UE maps the sequence-based PUCCH to two short symbols and performs frequency hopping between these two short symbols. In this case, even if there is only one PUCCH symbol, frequency hopping can be applied so that frequency diversity gain can be provided.

[0080] As shown in Figure 12B, even if symbol division is applied to a DMRS-based TDM PUCCH, frequency hopping cannot be applied between two short symbols, and thus frequency diversity gain cannot be provided. However, when, as shown in Figure 12C, symbol division is applied to an FDM-based DMRS PUCCH, although frequency hopping can be performed between two short symbols, the PAPR will increase, thus energy efficiency will decrease, and the communication area (coverage) will become smaller. That is, a sequence-based PUCCH can expand coverage compared to a DMRS-based PUCCH, which uses two short symbols in the same way.

[0081] Next, the BER performance of PUCCHs based on Petition 870190097492, dated 09 / 30 / 2019, page 31 / 84 The 23 / 71 sequence will be explained. Figures 13 are diagrams to show examples of PUCCHs spanning two symbols. Here, the BER performance of a TDM DMRS-based PUCCH in which a single-symbol DMRS and single-symbol UCI are time-division multiplexed (TDM) as shown in Figure 13A, the BER performance of a two-symbol sequence-based PUCCH to which frequency hopping is not applied, as shown in Figure 13B, and the BER performance of a two-symbol sequence-based PUCCH to which frequency hopping is applied, as shown in Figure 13C, will be compared. Each symbol has a bandwidth of four PRBs.

[0082] Figure 14 is a diagram to show examples of BER performance of PUCCHs. The underlying evaluation includes that the UCI is two-bit, the antenna format consists of one transmit antenna and two receive antennas, the carrier frequency is 4 GHz, the SCS is 15 kHz, and the channel model is EPA.

[0083] The BER performance of the sequence-based PUCCH, where frequency hopping is not applied, shows a 3 dB gain compared to the BER performance of the TDM DMRS-based PUCCH. This is because 50% of the DMRS header in the PUCCH is canceled. As for the BER performance of the sequence-based PUCCH where frequency hopping is applied, frequency diversity gain can be provided, unlike the BER performance of the sequence-based PUCCH without frequency hopping, so the BER performance curve becomes steep.

[0084] Next, the characteristics of sequence-based PUCCHs according to the first modality will be described in comparison with DMRS-based PUCCHs.

[0085] As mentioned earlier, when a sequence-based PUCCH is used, the DMRS header in a DMRS-based TDM PUCCH Petition 870190097492, dated 09 / 30 / 2019, page 32 / 84 24 / 71 is completely cancelled.

[0086] When the number of PUCCH symbols needs to be one, if a TDM DMRS-based PUCCH is used, it is necessary to split one symbol into two short symbols and allocate them to DMRS and UCI, respectively. Meanwhile, when a sequence-based PUCCH is used, the PUCCH can be transmitted in one symbol without splitting the symbol.

[0087] Frequency diversity cannot be applied to PUCCH based on TDM DMRS, which is two symbols or two short symbols split. Meanwhile, sequence-based PUCCH, which is two symbols or two short symbols split, can easily implement frequency diversity.

[0088] The PAPR of a sequence-based PUCCH may be lower than the PAPR of a DMRS-based PUCCH (at least a DMRS-based FDM PUCCH).

[0089] When the time duration of a sequence-based PUCCH is equal to the time duration of a DMRS-based PUCCH, the sequence-based PUCCH does not have a DMRS header and therefore demonstrates better BER performance than a DMRS-based PUCCH. Furthermore, when the BER performance of a sequence-based PUCCH is equal to the BER performance of a DMRS-based PUCCH, the time duration of the sequence-based PUCCH may be shorter than the time duration of the DMRS-based PUCCH.

[0090] Next, the sequence-based PUCCH multiplexing method (CDM) for multiple UEs on the same time / frequency resource will be described.

[0091] Figure 15 is a diagram to show an example of the sequence-based PUCCH multiplexing method. When the two-bit UCI is Petition 870190097492, dated 09 / 30 / 2019, page 33 / 84 25 / 71 reported using twelve phase rotation quantities, three sets of phase rotation quantities, which do not overlap with each other, can be assigned to UE1, UE2, and UE3. Each set of phase rotation quantities is sequence type (0). α0 to α3 are assigned to UE1, α4 to α7 are assigned to UE2, and α8 to α9 are assigned to UE3. As a result, the PUCCHs of UE1, UE2, and UE3 are multiplexed on the same time / frequency resource.

[0092] Thus, in a sequence-based PUCCH, where one UE uses four phase rotation quantities, up to three UEs can be multiplexed. On the other hand, in a DMRS-based PUCCH, where one UE uses one phase rotation quantity, up to twelve UEs can be multiplexed. Consequently, the maximum number of UEs that can be multiplexed in a sequence-based PUCCH is 1 / 4 of the maximum number of UEs that can be multiplexed in a DMRS-based PUCCH.

[0093] Next, how the UCI that is reported in a PUCCH-based sequence will be described will be described. Here, although the receive detection operation below assumes the case where the UCI is reported by selecting the phase rotation amount, the same operation will be maintained even when the UCI is reported by making selections of combinations of different feature types (e.g., base sequences, time / frequency features, etc.) or multiple feature types.

[0094] The network (e.g., a base radio station) can detect UTI from a received signal using maximum likelihood detection (which may be referred to as MLD or correlation detection). To be more specific, the network can generate replicas of all phase rotation quantities (phase rotation quantity replicas) assigned to the user terminal (e.g., the network can generate four phase rotation quantity replicas if the UTI payload length is two bits) and generate waveforms. Petition 870190097492, dated 09 / 30 / 2019, p. 34 / 84 26 / 71 of the transmission signal, as does the user terminal, based on the base sequences and phase rotation quantity replicas. Furthermore, the network can calculate the correlation between the produced transmission signal waveforms and the received signal waveform from the user terminal, for all phase rotation quantity replicas, and assume that the phase rotation quantity replica shows the highest correlation transmitted.

[0095] To be more specific, the network can multiply each element of received signal sequences of size M after DFT (complex numerical sequences of M) by complex conjugates of transmission signal sequences (complex numerical sequences of M), which are given by applying phase rotation to the base sequence of the transmission signal based on phase rotation quantity replicas, and assume that the phase rotation quantity replica where the absolute value of the sum of the sequences M (or the squares of the absolute values) is the largest was sent.

[0096] Alternatively, the network can generate replicas of the transmission signal to match the maximum number of phase rotation quantities that can be assigned (twenty-four for two PRBs) and estimate the phase rotation quantity to allow for the higher correlation with the received signal, based on the same operation as the MLD-based operation described above. When the estimated phase rotation quantity is not included in the assigned phase rotation quantities, it is possible to assume that the one closest to the estimated value among the assigned phase rotation quantities was transmitted.

[0097] [Second mode] According to a second embodiment of the present invention, the UE can report UCI of a larger number of bits through transmission based on Petition 870190097492, dated 09 / 30 / 2019, p. 35 / 84 27 / 71 sequence.

[0098] Spread code resources and time / frequency resources can be combined and used as transmission resources to report the UCI. A plurality of transmission resource candidates is associated with multiple UCI candidate values, respectively. The multiple candidates can be reported from the network to the UE via upper-layer signaling and / or physical-layer signaling.

[0099] The UE selects the transmission resource that corresponds to the UCI value to be reported, from the multiple candidates, and transmits a sequence-based PUCCH.

[00100] Figures 16 are diagrams, each showing an example of a sequence-based PUCCH where the time / frequency feature and the amount of phase rotation are combined.

[00101] For example, if the time / frequency resource location reports one bit (first bit) and the phase rotation quantity reports two bits (second and third bits), the UCI which has three bits in total can be reported. The time / frequency resource shown in Figure 16A and the time / frequency resource shown in Figure 16B are respectively associated with the values ​​0 and 1 of the first bit. α0 to α3 in the set of phase rotation quantities for sequence type (0) shown in Figure 6A are respectively associated with the values ​​of the second and third bits.

[00102] When the first bit of the UCI is 0 and the values ​​of the second and third bits are 11, the UE generates the sequence-based PUCCH transmission signal using α2 and transmits the sequence-based PUCCH using the time / frequency feature shown in Figure 16A. When the first bit of the UCI is 1 and the values ​​of the second and third bits are 11, the UE generates the signal Petition 870190097492, dated 09 / 30 / 2019, page 36 / 84 28 / 71 transmits the sequence-based PUCCH using α2 and transmits the sequence-based PUCCH using the time / frequency feature shown in Figure 16B.

[00103] As the first method of decoding UCI, the network can decode UCI based on MLD, which uses replicas of all three-bit patterns.

[00104] As a second method of UCI decoding, the network can decode the first bit by measuring the received power from each of the multiple time / frequency resource candidates. Additionally, UE can decode the second and third bits based on MLD, which uses replicas of all second and third bit candidates.

[00105] The first UCI decoding method can improve UCI error rate performance compared to the second UCI decoding method. However, when the first UCI decoding method is applied to UCIs consisting of a large number of bits, the MLD-based decoding process will be bulky. The second UCI decoding method can reduce the bulk of the decoding process compared to the first UCI decoding method.

[00106] Multiple candidate basis sequences and multiple candidate phase rotation quantities can be assigned to an UE. A number of candidate combinations of basis sequences and phase rotation quantities can be associated with multiple candidate UCI values, respectively. The UE selects the combination that corresponds to the UCI to be reported and generates the sequence-based PUCCH transmission signal.

[00107] For example, if the payload length of the UCI is four bits, the UE can report two bits of this UCI by selecting the base sequence and report two bits by selecting the phase rotation amount. It is possible to assume Petition 870190097492, dated 09 / 30 / 2019, page 37 / 84 29 / 71 that multiple candidate combinations of basis sequences and phase rotation quantities are reported from the network to the UE via upper layer signaling and / or physical layer signaling.

[00108] Multiple candidate base sequences can be associated with UCI payload lengths and reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. Base sequences can be identified by sequence indices. The UE can select the base sequence that corresponds to the UCI payload length to be reported and generate the sequence-based PUCCH transmission signal. Additionally, multiple candidate phase rotation quantities can be associated with multiple candidate UCI values ​​and reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. The UE can generate the sequence-based PUCCH transmission signal using the phase rotation quantity that corresponds to the UCI value to be reported. The multiple candidate phase rotation quantities can be the same, regardless of the base sequence.This makes it possible to reduce the amount of information needed when multiple candidate phase rotation quantities are reported.

[00109] In this example, the base sequence of sequence index (0) is associated with the case where the UCI payload length is two bits, and the base sequences of sequence indices (1) to (4) are associated with the case where the UCI payload length is four bits and these are reported from the network to the UE. When the UCI payload length is two bits, the UE selects the base sequence of sequence index (0) that corresponds to the UCI payload length, selects the phase rotation amount that corresponds to the UCI value to be reported, and generates the sequence-based PUCCH transmission signal using the base sequence and the amount of Petition 870190097492, dated 09 / 30 / 2019, page 38 / 84 30 / 71 selected phase rotation.

[00110] Figures 17 are diagrams to show examples of sequence-based PUCCHs where the base sequence reports two bits and the phase rotation quantity reports two bits. When the UCI payload length is four bits, the UE selects a base sequence that corresponds to the top two bits of the UCI to be reported, from sequence indices (1) to (4), selects a phase rotation quantity that corresponds to the bottom two bits of the UCI to be reported, from α0 to α4 in the set of phase rotation quantities, and generates the sequence-based PUCCH transmission signal using the base sequence and phase rotation quantity that are selected. Each of the sequence indices (1) to (4) is associated with the top two bits 00, 01, 11, and 10 of the UCI, respectively. Figures 17A to 17D show the sets of phase rotation quantities for use when sequence indices (1) to (4) are selected, respectively.

[00111] Note that multiple candidate phase rotation amounts can be associated with UCI payload lengths and reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. The UE can generate the sequence-based PUCCH transmission signal by selecting the phase rotation amount that corresponds to the reported UCI payload length. Additionally, multiple candidate base sequences can be associated with multiple candidate UCI values ​​and reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. The UE can select a base sequence that corresponds to the reported UCI value and generate the sequence-based PUCCH transmission signal.

[00112] Multiple candidate combinations of base sequences and Petition 870190097492, dated 09 / 30 / 2019, page 39 / 84 31 / 71 Phase rotation quantities can be associated with multiple candidate UCI values, and reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. Figures 18 are diagrams to show examples of sequence-based PUCCHs, where the base sequence and phase rotation quantity are combined to report four bits. In this example, the spread code features are defined in sixteen candidate patterns, including twelve candidate patterns that combine the base sequence of sequence index (1) shown in Figure 18A with each of the phase rotation quantities α0 to an and four candidate patterns that combine the base sequence of sequence index (2) shown in Figure 18B with each phase rotation quantity a0 to a3. The sixteen candidate patterns are associated with the sixteen candidate values ​​that the four-bit UCI can represent, respectively, and reported from the network to the UE.The UE selects a pattern that matches the reported UCI value from the sixteen candidate patterns and generates the sequence-based PUCCH transmission signal.

[00113] According to this example, it is possible to allocate spreading code resources, which combine basis sequences and phase rotation quantities, to UEs efficiently, without leaving excess resources. However, since multiple candidate combinations of basis sequences and phase rotation quantities are reported from the network to the UEs, the amount of information to report multiple candidates increases.

[00114] According to the second method described above, when the UCI is reported to consist of a large number of bits, it is possible to expand the coverage by lowering the required SNR, while preventing the number of PUCCH symbols from increasing.

[00115] In the case of a DMRS-based PUCCH being used, if the number Petition 870190097492, dated 09 / 30 / 2019, p. 40 / 84 32 / 71 bits of UCI information reporting increasing, the transmission power per bit will decrease and therefore the BER will increase and the coverage will be smaller. To prevent the coverage of DMRS-based PUCCHs from shrinking, it is necessary to increase the number of symbols.

[00116] On the other hand, in the case of a sequence-based PUCCH being used, although a sequence that is transmitted (phase rotation quantity) passes to more candidates as the number of UCI information bits to report increases, the error rate of the signal sequence that is transmitted does not change, even if the number of information bits increases, so that the coverage can be kept the same. Therefore, even when a sequence-based PUCCH is used to report UCI consisting of a large number of bits, it is possible to prevent the number of PUCCH symbols from increasing.

[00117] <Terceira Modalidade> According to a third embodiment of the present invention, a sequence-based PUCCH of a UE and another DMRS-based PUCCH of the UE are multiplexed.

[00118] For example, an UE can transmit a sequence-based PUCCH using the same time / frequency resource as the time / frequency resource for DMRS in the time / frequency resources for another DMRS-based PUCCH of the UE.

[00119] The time / frequency resource can be reported from the network to the UE via upper-layer signaling and / or physical-layer signaling. Sequence-based PUCCH and DMRS-based PUCCH thus use the same time / frequency resource, so the amount of information to report time / frequency resources can be reduced.

[00120] Figures 19 are diagrams, each showing an example of Petition 870190097492, dated 09 / 30 / 2019, page 41 / 84 33 / 71 a sequence-based PUCCH that is multiplexed over the DMRS in another UE TDM-based PUCCH. In the DMRS TDM-based PUCCH shown in Figure 19A, a DMRS and UCI are time-division multiplexed (TDM) into two short symbols, followed by a DMRS and UCI that are time-division multiplexed (TDM) into the next two short symbols, and frequency hopping is applied to these. The DMRS sequence is orthogonal to a sequence-based PUCCH (and is, for example, a CAZAC sequence). The sequence-based PUCCH of another UE, shown in Figure 19B, uses only the time / frequency feature for the DMRS. The sequence of this sequence-based PUCCH is orthogonal to the DMRS (and is, for example, a CAZAC sequence). In this way, it is possible to multiplex the DMRS of a TDM-based PUCCH and a sequence-based PUCCH using the same time / frequency feature.

[00121] Figures 20 are diagrams, each showing an example of a sequence-based PUCCH that is multiplexed over the DMRS of another UE-based FDM DMRS PUCCH. In the FDM DMRS-based PUCCH shown in Figure 20A, a DMRS and UCI are frequency-division (FDM) multiplexed on a short symbol, followed by a DMRS and UCI that are frequency-division (FDM) multiplexed on the next short symbol, and frequency hopping is applied to these. The DMRS sequence is orthogonal to the sequence-based PUCCH (and is, for example, a CAZAC sequence). The sequence-based PUCCH of another UE, shown in Figure 20B, uses only the time / frequency feature for the DMRS. The sequence of this sequence-based PUCCH is orthogonal to the DMRS (and is, for example, a CAZAC sequence). In this way, it is possible to multiplex the DMRS of an FDM-based PUCCH DMRS and a sequence-based PUCCH using the same time / frequency feature. Petition 870190097492, dated 09 / 30 / 2019, page 42 / 84 34 / 71

[00122] Figures 21 are diagrams, each showing an example of a sequence-based PUCCH that is multiplexed into another UE TDM DMRS-based PUCCH. The TDM DMRS-based PUCCH shown in Figure 21A is the same as that shown in Figure 19A, except that the UCI sequence is orthogonal to a sequence-based PUCCH (and is, for example, a CAZAC sequence). Another UE sequence-based PUCCH shown in Figure 21B is the same as that shown in Figure 19B, except that the sequence of the part that is multiplexed with the DMRS is orthogonal to the DMRS (and is, for example, a CAZAC sequence), and the sequence of the part that is multiplexed with the UCI is orthogonal to the UCI (and is, for example, a CAZAC sequence). By this means, it is possible to multiplex a TDM DMRS-based PUCCH and a sequence-based PUCCH using the same time / frequency feature.

[00123] Figures 22 are diagrams, each showing an example of a sequence-based PUCCH that is multiplexed into another UE FDM DMRS-based PUCCH. The DMRS-based PUCCH shown in Figure 22A is the same as that shown in Figure 20A, except that the UCI sequence is orthogonal to a sequence-based PUCCH (and is, for example, a CAZAC sequence). Another UE sequence-based PUCCH shown in Figure 22B is the same as that shown in Figure 20B, except that the sequence of the part that is multiplexed with the DMRS is orthogonal to the DMRS (and is, for example, a CAZAC sequence), and the sequence of the part that is multiplexed with the UCI is orthogonal to the UCI (and is, for example, a CAZAC sequence). In this way, it is possible to multiplex an FDM DMRS-based PUCCH and a sequence-based PUCCH using the same time / frequency feature.

[00124] Note that even if the DMRS and / or UCI of a DMRS-based PUCCH are not orthogonal sequences to a sequence-based PUCCH, multiplying these sequences by OCCs, the DMRS-based PUCCH and the Petition 870190097492, dated 09 / 30 / 2019, page 43 / 84 35 / 71 PUCCH based on sequence can be multiplexed over the same time / frequency resource.

[00125] According to the third modality described above, a sequence-based PUCCH and a DMRS-based PUCCH are multiplexed, so that it is possible to reduce time / frequency resources and improve resource utilization efficiency. In addition, it is possible to reduce the amount of information to report time / frequency resources.

[00126] <Detalhes das características> Now, the characteristics of each incorporation will be explained in detail below.

[00127] Base sequences that are used as scatter code features may be CAZAC (Constant Amplitude Zero Autocorrelation) sequences (e.g., Zadoff-Chu sequences) or may be sequences that are equivalent to CAZAC sequences (e.g., CG-CAZAC (Computer Generated CAZAC), such as those specified in 3GPP TS 36.211 §5.5.1.2 (in particular, in Table 5.5.1.2-1 and Table 5.5.1.2-2).

[00128] Information regarding base sequences can be reported from the network to UEs via upper layer signaling and / or physical layer signaling. Information regarding the selection of CAZAC sequences, information regarding the amount of phase rotation to be applied to the CAZAC sequences, information about sequences conforming to the CAZAC sequences (e.g., information about the rows and / or columns in the tables above (information about which row) and / or column the value used corresponds to) and similar pieces of information can be reported from the network to the UEs.

[00129] Note that basis sequences can be subjected to orthogonal scattering and transmitted. For example, a plurality of Petition 870190097492, dated 09 / 30 / 2019, p. 44 / 84 36 / 71 orthogonal codes (e.g., OCCs) can be assigned to a plurality of UEs, respectively. In this case, the same time / frequency resource, basis sequence, and phase rotation quantity can be shared by multiple UEs, so resource utilization efficiency can be improved. However, PAPR may increase. If orthogonal scattering is not used, PAPR can be kept low.

[00130] Next, the maximum number of UEs that can be multiplexed in a sequence-based PUCCH will be explained in comparison with a DMRS-based PUCCH.

[00131] A two-bit ICU case report will be explained below.

[00132] Figures 23 are diagrams to show the formats of an FDM DMRS-based PUCCH and a sequence-based PUCCH in the case of a two-bit UCI being reported. In the FDM DMRS-based PUCCH shown in Figure 23A, a DMRS and a two-bit UCI are frequency division multiplexed (FDM) using one symbol and two PRBs. The sequence-based PUCCH shown in Figure 23B reports a two-bit UCI using one symbol and one PRB. The BER performance of an FDM DMRS-based PUCCH comprised of two PRBs like this is the same as the BER performance of a sequence-based PUCCH comprised of one PRB. In other words, when the two-bit UCI is reported, a sequence-based PUCCH can cancel the DMRS overhead, and therefore can reduce the time / frequency resources to 1 / 2 compared to a DMRS-based PUCCH, to achieve the same BER performance.

[00133] Figures 24 are diagrams to show sets of phase rotation quantities for a DMRS-based PUCCH and a sequence-based PUCCH in the case of a reported two-bit UCI. The DMRS-based PUCCH uses only one phase rotation quantity, as Petition 870190097492, dated 09 / 30 / 2019, page 45 / 84 37 / 71 shown in Figure 24A. However, the sequence-based PUCCH uses four phase rotation quantities, as shown in Figure 24B. That is, when reporting the two-bit UCI, the number of phase rotation quantities used for a sequence-based PUCCH is four times the number of phase rotation quantities used for a DMRS-based PUCCH. However, since a sequence-based PUCCH can reduce the time / frequency resources for a two-bit UCI to 1 / 2 compared to a DMRS-based PUCCH, the maximum number of UEs that can be multiplexed in the sequence-based PUCCH is 1 / 2 of the maximum number of UEs that can be multiplexed in the DMRS-based PUCCH.

[00134] A case report of a four-bit UCI will be explained below.

[00135] Figures 25 are diagrams to show the formats of an FDM DMRS-based PUCCH and a sequence-based PUCCH in the case of a reported four-bit UCI. In the FDM DMRS-based PUCCH shown in Figure 25A, a DMRS and a four-bit UCI are frequency division multiplexed (FDM) using two symbols and two PRBs. The sequence-based PUCCH shown in Figure 25B reports a four-bit UCI using two symbols and one PRB. The BER performance of an FDM DMRS-based PUCCH comprised of two PRBs like this is the same as the BER performance of a sequence-based PUCCH comprised of one PRB. In other words, when a four-bit UCI is reported, a sequence-based PUCCH can reduce the time / frequency resources to 1 / 4, compared to a DMRS-based PUCCH, to achieve the same BER performance.

[00136] Assuming that CAZAC sequences from an LTE PRB are used as base sequences, thirty different base sequences can be used. If UE multiplexing is not taken into account, at most 360 (30 Petition 870190097492, dated 09 / 30 / 2019, page 46 / 84 38 / 71 χ 12) combinations of basis sequences and phase rotation quantities can be used in a basis by PRB.

[00137] A DMRS-based PUCCH uses only one phase rotation quantity as shown in Figure 24A. Figures 26 are diagrams to show spread code features for a sequence-based PUCCH, in the case of the four-bit UCI being reported. The sequence-based PUCCH in this example uses spread code features in sixteen candidate patterns, including twelve patterns in which the base sequence of sequence index (n) shown in Figure 26A is combined with each of the phase rotation quantities αο to αιι and four patterns in which the base sequence of sequence index (N + 1) shown in Figure 26B is combined with each of the phase rotation quantities αο to α3. That is, the four-bit UCI being reported, the number of phase rotation quantities used by a sequence-based PUCCH is sixteen times the number of phase rotation quantities used by a DMRS-based PUCCH.However, since a sequence-based PUCCH can reduce the time / frequency resources for two-bit UCIs to 1 / 4 compared to a DMRS-based PUCCH, the maximum number of UEs that can be multiplexed in the sequence-based PUCCH is 1 / 4 of the maximum number of UEs that can be multiplexed in the DMRS-based PUCCH.

[00138] Note that, compared to the BER performance of a sequence-based PUCCH that reports one or two bits of UCI, the BER performance of a sequence-based PUCCH that reports UCI consisting of a larger number of bits beyond that is almost the same.

[00139] (Radio Communication System) Now, the structure of the radio communication system according to one embodiment of the present invention will be described below. In this system of Petition 870190097492, dated 09 / 30 / 2019, page 47 / 84 39 / 71 radiocommunication, communication is performed using one or a combination of radiocommunication methods according to the embodiments contained herein of the present invention.

[00140] Figure 27 is a diagram to show an example of a schematic structure of a radiocommunication system according to an embodiment of the present invention. 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, where the LTE system bandwidth (e.g., 20 MHz) constitutes a unit.

[00141] Note that radio communication system 1 may be referred to as “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), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology)”, and so on, or it may be viewed as a system for implementing them.

[00142] The radio communication system 1 includes a base radio station 11 that forms a macro cell C1, with a relatively wide coverage, and base radio stations 12a to 12c that are placed within the macro cell C1 and that form small cells C2, which are narrower than the macro cell C1. In addition, user terminals 20 are placed in the macro cell C1 and in each small cell C2. The arrangement, number, and so on of the cells and user terminals 20 are not limited to those illustrated in the drawings.

[00143] User terminals 20 can connect to both base radio station 11 and base radio stations 12. User terminals 20 can use macro cell C1 and small cells C2 simultaneously by means of Petition 870190097492, dated 09 / 30 / 2019, page 48 / 84 40 / 71 of AC or DC. In addition, user terminals 20 can apply AC or DC using a plurality of cells (CCs) (e.g., five or fewer CCs or six or more CCs).

[00144] Between user terminals 20 and base station 11, communication can be carried out using a carrier with a relatively low frequency band (e.g., 2 GHz) and a narrow bandwidth (referred to as, for example, an “existing carrier”, a “legacy carrier”, and so on). However, between user terminals 20 and base radio stations 12, a carrier with a relatively high frequency band (e.g., 3.5 GHz, 5 GHz, and so on) and a wide bandwidth can be used, or the same carrier used at base radio station 11 can be used. Note that the frequency band structure for use at each base radio station is by no means limited to these.

[00145] A structure may be employed herein whereby a wired connection (e.g., means compliant with CPRI (Common Public Radio Interface), such as fiber optics, the X2 interface, and so forth) or a wireless connection is established between base radio station 11 and base radio station 12 (or between two base radio stations 12).

[00146] 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 top station device 30. Note that 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, but is by no means limited to these. Furthermore, each base radio station 12 can be connected to top station device 30 via base radio station 11. Petition 870190097492, dated 09 / 30 / 2019, page 49 / 84 41 / 71

[00147] Note 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 (eNoB)”, a “transmit / receive point”, and so on. Additionally, 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 eNoBs)”, “RRHs (Remote Radio Heads)”, “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.

[00148] User terminals 20 are terminals to support various communication schemes such as LTE, LTE-A and so on, and can be mobile communication terminals (mobile stations) or stationary communication terminals (fixed stations).

[00149] In radio communication system 1, as radio access schemes, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier frequency division multiple access (SC-FDMA) and / or OFDMA are applied to the uplink.

[00150] OFDMA is a multi-carrier communication scheme for performing communication by dividing a frequency bandwidth into a plurality of narrow frequency bandwidths (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single-carrier communication scheme for mitigating interference between terminals by dividing the system bandwidth into bands formed with one or more contiguous resource blocks per terminal, and allowing a plurality of terminals to use mutually different bands. Note that uplink and downlink radio access schemes are not limited to Petition 870190097492, dated 09 / 30 / 2019, pages 50 / 84 42 / 71, a combination of these, and other radio access schemes can be used.

[00151] In radio communication system 1, a shared downlink channel (PDSCH (Physical Downlink Shared Channel)), which is used by each user terminal 20 on a shared basis, a broadcast channel (PBCH (Physical Broadcast Channel)), L1 / L2 downlink control channels and so on are used as downlink channels. User data, upper layer control information and SIBs (System Information Blocks) are communicated on the PDSCH. In addition, the MIB (Main Information Block) is communicated on the PBCH.

[00152] The L1 / L2 downlink control channels include a PDCCH (Downlink Physical Control Channel), an EPDCCH (Enhanced Downlink Physical Control Channel), a PCFICH (Control Format Indicator Physical Channel), a PHICH (Hybrid ARQ Indicator Physical Channel), and so on. Downlink control information (DCI), including PDSCH and / or PUSCH scheduling information, is communicated by the PDCCH.

[00153] Note that scheduling information can be reported via DCI. For example, the DCI for scheduling the receipt of DL data can be called “DL assignment” and the DCI for scheduling the transmission of UL data can be called “UL grant”.

[00154] The number of OFDM symbols to be used for the PDCCH is communicated by the PCFICH. HARQ (Hybrid Automatic Repeat Request) delivery confirmation information (also referred to as, for example, “retransmission control information”, “HARQ-ACK”, “ACK / NACK”, etc.) in response to the PUSCH is transmitted by the PHICH. The EPDCCH is frequency-division multiplexed with the PDSCH (data channel). Petition 870190097492, dated 09 / 30 / 2019, pp. 51 / 84 43 / 71 shared downlink) and used to communicate DCI and so on, just like PDCCH.

[00155] In radio communication system 1, a shared uplink channel (PUSCH (Uplink Shared Physical Channel)), which is used by each user terminal 20 on a shared basis, an uplink control channel (PUCCH (Uplink Control Physical Channel)), a random access channel (PRACH (Random Access Physical Channel)), and so on are used as uplink channels. User data, upper-layer control information, and so on are communicated via the PUSCH. Additionally, the PUCCH communicates downlink radio quality information (CQI (Channel Quality Indicator)), delivery confirmation information, escalation requests (SRs), and so on. Random access preambles for establishing connections with cells are communicated via the PRACH.

[00156] In radio communication system 1, cell-specific reference signals (CRSs), channel state information reference signals (CSIRSs), demodulation reference signals (DMRSs), positioning reference signals (PRSs), and so on are communicated as downlink reference signals. Furthermore, in radio communication system 1, measurement reference signals (SRS (Survey Reference Signal)), demodulation reference signal (DMRS), and so on are communicated as uplink reference signals. Note that DMRS may be referred to as a “user terminal-specific reference signal (UE-specific reference signal)”. Moreover, the reference signals to be communicated are by no means limited to these.

[00157] [Base radio station] Petition 870190097492, dated 09 / 30 / 2019, pp. 52 / 84 44 / 71 Figure 28 is a diagram to show an example of a global structure of a base radio station according to an embodiment of the present invention. A base radio station 10 has 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. Note that one or more transmit / receive antennas 101, amplification sections 102 and transmit / receive sections 103 may be provided.

[00158] The user data to be transmitted from base radio station 10 to a user terminal 20 on the downlink is entered from the upstation device 30 to the baseband signal processing section 104, via the communication path interface 106.

[00159] In the baseband signal processing section 104, user data undergoes transmission processes, including 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) transmission process), scheduling, transport format selection, channel coding, fast inverse Fourier transform (IFFT) process, and precoding process, and the result is forwarded to each transmit / receive section 103. In addition, downlink control signals also undergo transmission processes, such as channel coding and a fast inverse Fourier transform, and are forwarded to each transmit / receive section 103. Petition 870190097492, dated 09 / 30 / 2019, pp. 53 / 84 45 / 71

[00160] Baseband signals that are pre-encoded and emitted from the baseband signal processing section 104 by antenna are converted into a radio frequency band in the transmission / reception sections 103, and then transmitted. The radio frequency signals that have undergone frequency conversion in the transmission / reception sections 103 are amplified in the amplification sections 102 and transmitted from the transmission / reception antennas 101. The transmission / reception sections 103 may consist of transmitters / receivers, transmission / reception circuits or transmission / reception apparatus which may be described based on a general understanding of the technical field to which the present invention relates. Note that a 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.

[00161] However, as for uplink signals, the radio frequency signals that are received at the transmit / receive antennas 101 are each amplified in the amplification sections 102. The transmit / receive sections 103 receive the uplink signals amplified in the amplification sections 102. The received signals are converted into the baseband signal by frequency conversion in the transmit / receive sections 103 and emitted to the baseband signal processing section 104.

[00162] In the baseband signal processing section 104, the user data that is included in the uplink signals that are inserted is subjected to a Fast Fourier Transform (FFT) process, an Inverse Discrete Fourier Transform (IDFT) process, error correction decoding, MAC retransmission control reception process, and RLC layer and PDCP layer reception processes, and forwarded to the Petition 870190097492, dated 09 / 30 / 2019, pp. 54 / 84 46 / 71 upper station device 30 via communication path interface 106. The call processing section 105 performs call processing (such as establishing and releasing communication channels), manages the status of base radio stations 10 and manages radio resources.

[00163] The communication path interface section 106 transmits and receives signals to and from the higher station apparatus 30 through a specific interface. In addition, the communication path interface 106 can transmit and receive signals (backhaul signaling) with other base 10 radio stations through an interbase station interface (which is, for example, fiber optic that conforms to CPRI (Common Public Radio Interface), the X2 interface, etc.).

[00164] In addition, the transmit / receive sections 103 can transmit information that associates a plurality of candidate values ​​of UL control information (e.g., UCI) with a plurality of candidate spreading code features (e.g., at least one of the base sequences, phase rotation quantities, and OCCs), respectively. In addition, the transmit / receive sections 103 can transmit information that associates a plurality of candidate values ​​of UL control information with a plurality of candidate quantities of phase rotation and / or base sequences, respectively.

[00165] Figure 29 is a diagram to show an example of a functional structure of a base radio station according to an embodiment of the present invention. Note that, although this example mainly shows functional blocks belonging to characteristic parts of the present embodiment, the base radio station 10 has other functional blocks that are also necessary for radio communication. Petition 870190097492, dated 09 / 30 / 2019, pages 55 / 84 47 / 71

[00166] The baseband signal processing section 104 has a control (scheduler) section 301, a transmission signal generation section 302, a mapping section 303, a received signal processing section 304, and a measurement section 305. Note that these settings only need to be included in base station 10, and some or all of these settings may not be included in the baseband signal processing section 104.

[00167] The control section (scheduler) 301 controls the entire base radio station 10. The control section 301 may consist of a controller, a control circuit or a control apparatus which may be described based on the general understanding of the technical field to which the present invention pertains.

[00168] Control section 301, for example, controls signal generation in the transmission signal generation section 302, signal allocation by the mapping section 303, and so on. In addition, control section 301 controls signal reception processes in the received signal processing section 304, signal measurements in the measurement section 305, and so on.

[00169] Control section 301 controls the scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals transmitted on the PDSCH), and downlink control signals (e.g., signals transmitted on the PDCCH and / or EPDCCH, such as delivery confirmation information). Control section 301 controls the generation of downlink control signals, downlink data signals, and so on, based on the results of deciding whether or not retransmission control is needed for uplink data signals, and so on. Additionally, control section 301 controls the scheduling of synchronization signals (e.g., signals of Petition 870190097492, dated 09 / 30 / 2019, pp. 56 / 84 48 / 71 downlink reference PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) (e.g., CRS, CSI-RS, DM RS, etc.) and so on.

[00170] Control section 301 also controls the scheduling of uplink data signals (e.g., signals transmitted on the PUSCH), uplink control signals (e.g., signals transmitted on the PUCCH and / or PUSCH, such as delivery confirmation information), random access preambles (e.g., signals transmitted on the PRACH), uplink reference signals, and / or other signals.

[00171] The transmission signal generation section 302 generates downlink signals (downlink control signals, downlink data signals, downlink reference signals, and so on) based on commands from the control section 301, and transmits these signals to the mapping section 303. The transmission signal generation section 302 may consist of a signal generator, a signal generation circuit, or a signal generation apparatus, which may be described based on a general understanding of the technical field to which the present invention relates.

[00172] For example, the transmission signal generation section 302 generates DL assignments, which report downlink data allocation information, and / or UL grants, which report uplink data allocation information, based on commands from control section 301. DL assignments and UL grants are both DCI and follow the DCI format. In addition, downlink data signals are subjected to encoding, modulation, and so on, using encoding rates and modulation schemes that are determined based on, for example, the channel state information (CSI) of each user terminal 20. Petition 870190097492, dated 09 / 30 / 2019, pp. 57 / 84 49 / 71

[00173] The mapping section 303 maps the downlink signals generated in the transmission signal generation section 302 to certain radio resources based on commands from the control section 301, and transmits them to the transmission / reception sections 103. The mapping section 303 may consist of a mapper, a mapping circuit or a mapping apparatus which may be described based on a general understanding of the technical field to which the present invention relates.

[00174] The received signal processing section 304 performs reception processes (e.g., demapping, demodulation, decoding, and so on) of received signals that are entered from the transmission / reception sections 103. Here, the received signals include, for example, uplink signals transmitted from the user terminal 20 (uplink control signals, uplink data signals, uplink reference signals, etc.). For the received signal processing section 304, a signal processor, a signal processing circuit, or a signal processing apparatus may be used, which can be described based on a general understanding of the technical field to which the present invention relates.

[00175] The received signal processing section 304 transmits the decoded information, acquired through the reception processes, to the control section 301. For example, when a PUCCH containing a HARQACK is received, the received signal processing section 304 transmits this HARQ-ACK to the control section 301. In addition, the received signal processing section 304 transmits the received signals and / or the signals after the reception processes to the measurement section 305.

[00176] Measurement section 305 conducts measurements in relation to the received signals. Measurement section 305 may consist of a meter, a Petition 870190097492, dated 09 / 30 / 2019, pp. 58 / 84 50 / 71 measuring circuit or measuring apparatus that can be described based on a general understanding of the technical field to which the present invention relates.

[00177] For example, measurement section 305 can perform RRM (Radio Resource Management) measurements, CSI (Channel State Information) measurements, and so on, based on received signals. Measurement section 305 can measure received power (e.g., RSRP (Received Reference Signal Power)), received quality (e.g., RSRQ (Received Reference Signal Quality), SINR (Signal-to-Interference plus Noise Ratio), etc.), signal strength (e.g., RSSI (Received Signal Strength Indicator)), transmission path information (e.g., CSI), and so on. The measurement results can be sent to control section 301.

[00178] In addition, control section 301 can control the allocation of resources for reporting UL control information to user terminals 20. Furthermore, when allocating resources for reporting UL control information to a plurality of user terminals 20, control section 301 can allocate resources that are orthogonal to each other to those user terminals 20.

[00179] In addition, control section 301 can identify UL control information based on the processing result in received signal processing section 304, or identify UL control information associated with the time feature and / or frequency feature based on the measurement result (e.g., the received power measurement result) acquired from measurement section 305.

[00180] (User Terminal) Figure 30 is a diagram to show an example of a global structure of a user terminal according to an embodiment of the present invention. A user terminal 20 has a plurality of antennas of Petition 870190097492, dated 09 / 30 / 2019, pp. 59 / 84 51 / 71 transmission / reception 201, amplification sections 202, transmission / reception sections 203, a baseband signal processing section 204 and an application section 205. Note that one or more transmission / reception antennas 201, amplification sections 202 and transmission / reception sections 203 may be provided.

[00181] The radio frequency signals received at the transmit / receive antennas 201 are amplified in the amplification sections 202. The transmit / receive sections 203 receive the downlink signals amplified in the amplification sections 202. The received signals undergo frequency conversion and are converted into the baseband signal in the transmit / receive sections 203 and transmitted to the baseband signal processing section 204. A transmit / receive section 203 may consist of a transmitter / receiver, a transmit / receive circuit, or a transmit / receive apparatus, which may be described based on a general understanding of the technical field to which the present invention relates. Note that a transmit / receive section 203 may be structured as a transmit / receive section in one entity, or it may consist of a transmit section and a receive section.

[00182] The baseband signal processing section 204 performs, for the incoming baseband signal, an FFT process, error correction decoding, a retransmission control reception process, and so on. Downlink user data is forwarded to application section 205. Application section 205 performs processes related to higher layers above the physical layer and the MAC layer, and so on. In addition, in downlink data, broadcast information may also be forwarded to application section 205. Petition 870190097492, dated 09 / 30 / 2019, pages 60 / 84 52 / 71

[00183] However, uplink user data is introduced 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, precoding, a discrete Fourier transform (DFT) process, an IFFT process, and so on, and the result is forwarded to the transmit / receive sections 203. Baseband signals exiting baseband signal processing section 204 are converted to a radio frequency band in the transmit / receive sections 203 and transmitted. 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.

[00184] In addition, the transmission / reception sections 203 can receive information that associates a plurality of candidate values ​​of UL control information with a plurality of candidate spreading code features, respectively.

[00185] In addition, the transmission / reception section 203 can receive information that associates a plurality of candidate values ​​of UL control information with a plurality of candidate quantities of phase rotation and / or basis sequences, respectively.

[00186] In addition, the transmission / reception sections 203 can receive information that associates a plurality of candidate values ​​of UL control information with a plurality of candidate time resources and / or frequency resources, respectively.

[00187] Figure 31 is a diagram to show an example of a functional structure of a user terminal according to a modality. Petition 870190097492, dated 09 / 30 / 2019, pp. 61 / 84 53 / 71 of the present invention. Note that, although this example mainly shows functional blocks belonging to characteristic parts of the present embodiment, the user terminal 20 has other functional blocks that are also necessary for radio communication.

[00188] The baseband signal processing section 204 provided in the user terminal 20 has at least one control section 401, one transmission signal generation section 402, one mapping section 403, one received signal processing section 404, and one measurement section 405. Note that these configurations only need to be included in the user terminal 20, and some or all of these configurations may not be included in the baseband signal processing section 204.

[00189] Control section 401 controls the entire user terminal 20. For control section 401, a controller, a control circuit or a control apparatus that can be described based on the general understanding of the technical field to which the present invention relates can be used.

[00190] Control section 401, for example, controls signal generation in the transmission signal generation section 402, signal allocation by the mapping section 403, and so on. In addition, control section 401 controls signal reception processes in the received signal processing section 404, signal measurements in the measurement section 405, and so on.

[00191] Control section 401 acquires the downlink control signals and downlink data signals transmitted from base radio station 10, via the received signal processing section 404. Control section 401 controls the generation of uplink control signals and / or uplink data signals based on the results, deciding whether or not retransmission control is necessary for the downlink control signals and / or downlink data signals, and so on. Petition 870190097492, dated 09 / 30 / 2019, pages 62 / 84 54 / 71 front.

[00192] Furthermore, when various types of information reported from base radio station 10 are acquired through the received signal processing section 404, the control section 401 can update the parameters to use in the control based on these pieces of information.

[00193] The transmission signal generation section 402 generates uplink signals (uplink control signals, uplink data signals, uplink reference signals, etc.) based on commands from the control section 401 and transmits these signals to the mapping section 403. The transmission signal generation section 402 may consist of a signal generator, a signal generation circuit, or a signal generation apparatus, which may be described based on a general understanding of the technical field to which the present invention relates.

[00194] For example, the 402 transmission signal generation section generates uplink control signals related to delivery confirmation information, channel status information (CSI), and so on, based on commands from the 401 control section. Additionally, the 402 transmission signal generation section generates uplink data signals based on commands from the 401 control section. For example, when a UL grant is included in a downlink control signal, which is reported from base station 10, the 401 control section commands the 402 transmission signal generation section to generate an uplink data signal.

[00195] Mapping section 403 maps the uplink signals generated in the transmission signal generation section 402 to command-based radio resources in control section 401, and sends the result to transmission / reception sections 203. The mapping section Petition 870190097492, dated 09 / 30 / 2019, pp. 63 / 84 55 / 71 403 may consist of a mapper, a mapping circuit or a mapping apparatus which may be described based on a general understanding of the technical field to which the present invention relates.

[00196] The received signal processing section 404 performs reception processes (e.g., demapping, demodulation, decoding, and so on) of received signals that are fed in from the transmission / reception sections 203. Here, the received signals include, for example, downlink signals (downlink control signals, downlink data signals, downlink reference signals, and so on) that are transmitted from the base radio station 10. The received signal processing section 404 may consist of a signal processor, a signal processing circuit, or a signal processing apparatus, which may be described based on a general understanding of the technical field to which the present invention relates. Furthermore, the received signal processing section 404 may constitute the reception section according to the present invention.

[00197] The received signal processing section 404 transmits the decoded information, acquired through the reception processes, to the control section 401. The received signal processing section 404 transmits, for example, broadcast information, system information, RRC signaling, DCI and so on, to the control section 401. In addition, the received signal processing section 404 transmits the received signals and / or the signals after the reception processes to the measurement section 405.

[00198] Measurement section 405 conducts measurements in relation to the received signals. Measurement section 405 may consist of a meter, a measurement circuit or measuring apparatus which may be described based on a general understanding of the technical field to which the present invention relates. Petition 870190097492, dated 09 / 30 / 2019, pages 64 / 84 56 / 71

[00199] For example, measurement section 405 can perform RRM measurements, CSI measurements, and so on based on the received signals. Measurement section 405 can measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, etc.), signal strength (e.g., RSSI), transmission path information (e.g., CSI), and so on. The measurement results can be output to control section 401.

[00200] In addition, control section 401 can control the mapping of a UL signal that is generated using a spread code feature that is associated with a UL control information value, to a plurality of timing features (e.g., a plurality of symbols).

[00201] In addition, the 401 control section can control the frequency hopping of the UL signal between multiple time features.

[00202] In addition, control section 401 can control the generation of the UL signal using a phase rotation quantity and / or a basis sequence that is associated with the value of the UL control information among a plurality of candidates of phase rotation quantities and / or basis sequences based on the information that associates a plurality of candidate values ​​for the UL control information with a plurality of candidates of phase rotation quantities and / or basis sequences, respectively.

[00203] Furthermore, these multiple candidates can each be a combination of at least one of a base sequence, a time feature, and a frequency feature, with a phase rotation amount. Control section 401 can control the generation of the UL signal using the combination corresponding to the value of the UL control information among the multiple candidates. Petition 870190097492, dated 09 / 30 / 2019, pages 65 / 84 57 / 71

[00204] In addition, these multiple candidates may vary by user terminal.

[00205] Also, when another UL signal containing a reference signal is transmitted from another user terminal, control section 401 can control the code division multiplexing of the generated UL signal to the reference signal and transmission of the multiplexed signals.

[00206] (Hardware Structure) Note that the block diagrams used to describe the embodiments above show blocks in functional units. These functional blocks (components) can be implemented in arbitrary combinations of hardware and / or software. Furthermore, the means of implementing each functional block are not particularly limited. That is, each functional block can be realized by a piece of the device that is physically and / or logically aggregated, or it can be realized by directly and / or indirectly connecting two or more physically and / or logically separate pieces (via wired or wireless connections, for example) and using these multiple pieces of the device.

[00207] For example, the base radio station, user terminals, and so forth according to embodiments of the present invention may function as a computer that executes the processes of the radio communication method of the present invention. Figure 32 is a diagram to show an example of the hardware structure of a base radio station and a user terminal according to an embodiment of the present invention. Physically, the base radio stations 10 and user terminals 20 described above may be formed as a computer apparatus that includes a processor 1001, a memory 1002, a storage 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, and a bus 1007. Petition 870190097492, dated 09 / 30 / 2019, pages 66 / 84 58 / 71

[00208] Note that in the following description, the word apparatus may be replaced by circuit, device, unit, and so forth. Note that the hardware structure of a base radio station 10 and a user terminal 20 may be designed to include one or more of each apparatus shown in the drawing, or may be designed to not include any apparatus.

[00209] 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 processes can be implemented sequentially, or in different ways, on two or more processors. Note that the 1001 processor can be implemented with one or more chips.

[00210] Each function of the base radio station 10 and the user terminal 20 is implemented by reading certain software (program) from hardware such as the processor 1001 and memory 1002, and controlling the calculations in the processor 1001, the communication in the communication device 1004, and the reading and / or writing of data in memory 1002 and storage 1003.

[00211] Processor 1001 can control the entire computer, for example, by running 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 baseband signal processing section 104 (204) described above, the call processing section 105, and others can be implemented by processor 1001.

[00212] In addition, processor 1001 reads programs (program codes), software modules or data from storage 1003 and / or communication device 1004 into memory 1002, and executes various Petition 870190097492, dated 09 / 30 / 2019, pages 67 / 84 59 / 71 processes according to these. As for programs, programs can be used to allow computers to perform at least part of the operations of the modalities described above. For example, the control section 401 of user terminals 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.

[00213] 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 / or 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 / or so forth to implement the radio communication methods according to the embodiments of the present invention.

[00214] Storage 1003 is a computer-readable recording medium and may consist, for example, of at least a floppy disk, a floppy disk (trademark), a magneto-optical disk (e.g., a compact disc (CD-ROM (Compact Disc ROM) and so on), a digital versatile disk, a Blu-ray disc (trademark), a removable disk, a hard disk, a smart card, a flash memory device (e.g., a card, a rod, a key drive, etc.), a magnetic stripe, a database, a server and / or other suitable storage medium. Storage 1003 may be referred to as a secondary storage device.

[00215] The communication device 1004 is hardware (device of Petition 870190097492, dated 09 / 30 / 2019, pages 68 / 84 60 / 71 transmission / reception) to enable communication between computers using 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 apparatus 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and so forth to perform, for example, frequency division duplex (FDD) and / or time division duplex (TDD). For example, the transmission / reception antennas 101 (201) described above, the amplification sections 102 (202), the transmission / reception sections 103 (203), the communication path interface 106, and so forth may be implemented by the communication apparatus 1004.

[00216] Input device 1005 is an input device for receiving input 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 for sending output to the outside (e.g., a display, a speaker, an LED (Light Emitting Diode) lamp, and so on). Note that input device 1005 and output device 1006 can be provided in an integrated structure (e.g., a touch panel).

[00217] Furthermore, these device components, including the processor 1001, the memory 1002, and so on, are connected by the bus 1007 to communicate information. The bus 1007 can be formed with a single bus, or it can be formed by buses that vary between parts of the device.

[00218] In addition, the base radio station 10 and the user terminal 20 can be structured to include hardware such as a microprocessor, a Petition 870190097492, dated 09 / 30 / 2019, pages 69 / 84 61 / 71 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 some or all of the functional blocks can be implemented by the hardware. For example, the 1001 processor can be implemented with at least one of these hardware components.

[00219] (Variations) Note that the terminology used in this specification and the terminology necessary to understand this specification 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”). Furthermore, “signals” may be “messages.” A reference signal may be abbreviated as “RS” and may be referred to as “pilot,” “pilot signal,” and so on, depending on which standard applies. Additionally, a “component carrier (CC)” may be called a “cell,” “frequency carrier,” “frequency carrier,” and so on.

[00220] Furthermore, a radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be referred to as a subframe. In addition, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time duration (e.g., 1 ms) independent of numerology.

[00221] In addition, a slot may be composed of one or more time-domain symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, and so on). Furthermore, a slot may be a numerologically based unit of time. Additionally, a slot may include a Petition 870190097492, dated 09 / 30 / 2019, pages 70 / 84 62 / 71 plurality of mini slots. Each mini slot can consist of one or more symbols in the time domain. Additionally, a mini slot can be referred to as a sub slot.

[00222] A radio frame, a subframe, a slot, a mini-slot, and a symbol all represent the unit of time in signal communication. A radio frame, a subframe, a slot, a mini-slot, and a symbol may be called by other applicable names. For example, a subframe may be referred to as a transmission time interval (TTI), or a plurality of consecutive subframes may be referred to as a TTI, or a slot or mini-slot 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., one to thirteen symbols), or may be a period of time longer than 1 ms. Note that the unit to represent the TTI may be called a slot, mini-slot, and so on, instead of a subframe.

[00223] Here, a TTI refers to the minimum scheduling time unit in radiocommunication, for example. For instance, in LTE systems, a base radio station schedules radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to allocate to each user terminal in TTI units. Note that the definition of TTIs is not limited to this.

[00224] The TTI can be the time unit for transmitting channel-encoded data packets (transport blocks), code blocks, and / or codewords, or it can be the processing unit in scheduling, link adaptation, and so on. Note that when a TTI is given, the time period (e.g., the number of symbols) in which transport blocks, code blocks, and / or codewords are actually mapped may be less than the TTI. Petition 870190097492, dated 09 / 30 / 2019, pp. 71-84 63 / 71

[00225] Note that when a slot or a mini slot is referred to as a "TTI", one or more TTIs (i.e., one or more slots or one or more mini slots) may be the minimum scheduling time unit. Furthermore, the number of slots (the number of mini slots) to constitute this minimum scheduling time unit may be controlled.

[00226] A TTI having a duration of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8 to 12), a long TTI, a normal subframe, a long subframe, and so on. A TTI that is shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (or a fractional TTI), a shortened subframe, a short subframe, a mini slot, a sub slot, and so on.

[00227] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) can be replaced by a TTI with a duration exceeding 1 ms, and a short TTI (e.g., a shortened TTI) can be replaced by a TTI with a TTI duration less than the TTI duration of a long TTI, but not less than 1 ms.

[00228] A feature block (RB) is the unit of resource allocation in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. In addition, an RB may include one or more symbols in the time domain and may be a slot, a mini-slot, a subframe, or a length TTI. A TTI and a subframe may be composed of one or more feature blocks. Note that one or more RBs may be referred to as a “physical feature block (PRB (Physical RB))”, a “subcarrier group (SCG)”, a “resource element group (REG)”, a “PRB pair”, an RB pair, and so on.

[00229] In addition, a resource block can be composed of one or more resource elements (REs). For example, a RE can be a field of Petition 870190097492, dated 09 / 30 / 2019, pp. 72 / 84 64 / 71 radio resource of a subcarrier and a symbol.

[00230] Note that the radio frame, subframe, slot, mini-slot, symbol, and so forth structures described are merely examples. For instance, settings regarding the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol duration, the length of cyclic prefixes (CPs), and so forth can be changed in various ways.

[00231] In addition, the information and parameters described in this specification may be represented in absolute values ​​or in relative values ​​with respect to certain values, or may be represented in other information formats. For example, radio capabilities may be specified by certain indices. Furthermore, the equations for using these parameters and so forth may differ from those explicitly described in this specification.

[00232] The names used for parameters and so forth in this specification are not limiting. For example, since various channels (PUCCH (Uplink Physical Control Channel), PDCCH (Downlink Physical Control Channel), and so forth) and information elements can be identified by any suitable names, the various names assigned to these individual channels and information elements are not limiting.

[00233] The information, signals and / or other items described in this specification may be represented using a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols and chips, all of which may be referenced throughout the description herein. Petition 870190097492, dated 09 / 30 / 2019, pp. 73 / 84 65 / 71 contained, can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

[00234] Furthermore, information, signals, and so on can be transmitted from upper layers to lower layers and / or from lower layers to upper layers. Information, signals, and so on can be inserted and / or transmitted through a plurality of network nodes.

[00235] The information, signals, and so forth that are entered and / or emitted can be stored in a specific location (e.g., a memory), or can be managed using a management table. The information, signals, and so forth to be entered and / or emitted can be overwritten, updated, or appended. The information, signals, and so forth that are emitted can be erased. The information, signals, and so forth that are entered can be transmitted to other parts of the device.

[00236] Information reporting is by no means limited to the aspects / modalities described in this specification, and other methods may be used as well. 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 (the main information block (MIB), the system information blocks (SIBs), and so on), MAC (Media Access Control) signaling, and so on) and other signals and / or combinations thereof.

[00237] Note that physical layer signaling can be referred to as Petition 870190097492, dated 09 / 30 / 2019, pages 74 / 84 66 / 71 “L1 / L2 control information (Layer 1 / Layer 2) (L1 / L2 control signals)”, “L1 control information (L1 control signal)” and so on. Furthermore, RRC signaling can be referred to as “RRC messages” and can be, for example, an RRC connection configuration message, an RRC connection reconfiguration message, and so on. Additionally, MAC signaling can be reported using, for example, MAC control elements (MAC CEs (Control Elements)).

[00238] Furthermore, the reporting of given information (e.g., reporting information to the effect that “X holds”) does not necessarily need to be sent explicitly, and can be sent implicitly (e.g., by not reporting this piece of information).

[00239] Decisions can be made on values ​​represented by a bit (0 or 1), they can be made on boolean values ​​that represent true or false, or they can be made by comparing numerical values ​​(for example, comparison with a given value).

[00240] Software, whether referred to as software, firmware, middleware, microcode, or hardware description language, or called by other names, should be interpreted broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so forth.

[00241] In addition, software, commands, information, and so on can be transmitted and received through communication media. For example, when software is transmitted from a website, server, or other remote sources using wired technologies (coaxial cables, fiber optic cables). Petition 870190097492, dated 09 / 30 / 2019, pages 75 / 84 67 / 71 optical, twisted pair cables, digital subscriber lines (DSL) and so on) and / or wireless technologies (infrared radiation, microwaves and so on), these wired and / or wireless technologies are also included in the definition of communication media.

[00242] The terms system and network as used here are used interchangeably.

[00243] As used herein, the terms base station (BS), base radio station, eNB, gNB, cell, sector, cell group, carrier, and component carrier may be used interchangeably. A base station may be called a fixed station, Node B, eNodeB (eNB), access point, transmit point, receive point, femto cell, small cell, and so forth.

[00244] A base station may accommodate one or more (e.g., three) 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.

[00245] As used herein, the terms mobile station (MS), user terminal, user equipment (UE), and terminal may be used interchangeably. A base station may be referred to as a fixed station, Node B, eNode B (eNB), access point, transmit point, receive point, femto cell, small cell, and so forth.

[00246] A mobile station may be referred to, by one skilled in the art, Petition 870190097492, dated 09 / 30 / 2019, pp. 76 / 84 68 / 71 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, cellular, mobile client, client or some other suitable terms.

[00247] Furthermore, base radio stations, in this specification, can be interpreted as user terminals. For example, each aspect / embodiment of the present invention can be applied to a configuration in which communication between a base radio station and a user terminal is replaced by communication between a plurality of user terminals (D2D (Device to Device)). In this case, the user terminals 20 can have the functions of the base radio stations 10 described above. Furthermore, terms such as “uplink” and “downlink” can be interpreted as “lateral”. For example, an uplink channel can be interpreted as a lateral channel.

[00248] Similarly, the user terminals in this specification can be interpreted as base radio stations. In this case, base radio stations 10 can have the functions of the user terminals 20 described above.

[00249] Certain actions described in this specification as being performed by base stations may, in some cases, be performed by higher-level nodes (superior nodes). In a network composed of one or more network nodes with base stations, it is clear that several 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 (Server Gateways), and so on), but these are not Petition 870190097492, dated 09 / 30 / 2019, pp. 77 / 84 69 / 71 limiting factors) in addition to base stations, or combinations thereof.

[00250] The aspects / modalities illustrated in this specification can be used individually or in combinations, which can be switched depending on the implementation mode. The order of processes, sequences, flowcharts, and others used to describe the aspects / modalities here can be reordered, provided that no inconsistencies arise. For example, although several methods have been illustrated in this specification with various step components in exemplary orders, the specific orders illustrated here are by no means limiting.

[00251] The aspects / modalities illustrated in this specification can be applied to systems using 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), New-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 Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra Wideband), Bluetooth (registered trademark) and other methods of suitable radiocommunication and / or next-generation systems that are enhanced based on them.

[00252] The phrase “based on”, as used in this specification, does not mean “based only on”, unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based on at least”.

[00253] The reference to elements with designations such as first, Petition 870190097492, dated 09 / 30 / 2019, pp. 78 / 84 70 / 71 second and so on, as used here, generally does not limit the number / quantity or order of these elements. These designations are used here only for convenience, as a method of distinguishing between two or more elements. Thus, the reference to the first and second elements does not imply that only two elements can be used, or that the first element must precede the second element in any way.

[00254] The terms judge and determine, as used herein, can encompass a wide variety of actions. For example, judging and determining as used herein can be interpreted as making judgments and determinations related to calculating, computing, processing, deriving, investigating, researching (e.g., searching a table, a database, or some other data structure), ascertaining, and so forth. Furthermore, judging and determining as used herein can be interpreted as making judgments and determinations related to receiving (e.g., receiving information), transmitting (e.g., transmitting information), inserting, generating, accessing (e.g., accessing data in a memory), and so forth. Additionally, judging and determining, as used herein, can be interpreted as meaning making judgments and determinations related to resolution, selection, choice, establishment, comparison, and so forth.In other words, to judge and to determine, as used here, can be interpreted as meaning to make judgments and determinations related to some action.

[00255] As used herein, the terms connected and coupled, or any variation thereof, mean all direct or indirect connections or coupling 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 one another. The coupling or connection Petition 870190097492, dated 09 / 30 / 2019, pp. 79 / 84 71 / 71 between elements can be physical, logical, or a combination thereof. For example, connection can be interpreted as access. As used herein, two elements can be considered connected or coupled to each other using one or more electrical wires, cables, and / or printed electrical connections, and, as a number of non-limiting and non-inclusive examples, using electromagnetic energy, such as electromagnetic energy with wavelengths in radio frequency fields, microwave regions, and optical regions (visible and invisible).

[00256] When terms such as include, comprise, and variations thereof are used in this specification or in claims, these terms should be inclusive, in a manner similar to how the term provide is used. Furthermore, the term or, as used in this specification or in claims, is intended not to be an exclusive disjunction.

[00257] Now, although the present invention has been described in detail above, it should be obvious to a person skilled in the art that the present invention is by no means limited to the embodiments described herein. 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. Consequently, the description presented herein is only for the purpose of explaining examples, and should in no way be interpreted as limiting the present invention in any way. The description of Japanese Patent Application No. 2017-017975, filed on February 2, 2017, including specification, drawings and abstract, is incorporated herein by reference in its entirety. Petition 870190097492, dated 09 / 30 / 2019, pp. 80 / 84

Claims

1 / 3 CLAIMS 1. Terminal (20) characterized in that it comprises: a control section (401) configured to use, in uplink control information transmission, an uplink control channel format including a first uplink control channel format and a second uplink control channel format based on a number of bits of the uplink control information; and a transmission section (203) configured to transmit the uplink control information in an uplink control channel, wherein the first uplink control channel format is used for transmission of a sequence obtained by applying a cyclic shift to a base sequence and is not used for transmission of a demodulation reference signal, the length of the sequence being 12,A cyclic shift depends on a value of the uplink control information, and the second uplink control channel format is used for transmission of the uplink control information and a demodulation reference signal, and when the first uplink control channel format is used for transmission of the uplink control information and a duration of the uplink control channel is a plurality of symbols, the control section (401) is configured to map the sequences to the plurality of symbols respectively and map the sequences to the same 12 subcarriers, wherein the sequences are obtained by applying cyclic shifts respectively, and the cyclic shifts depend on the same value of the uplink control information.

2. Terminal (20), according to claim 1, characterized in that when the uplink control information transmitted using the first uplink control channel format comprises 2 bits of Hybrid Automatic Repeat Request Acknowledgment, HARQ-ACK, then an interval between each of the four cyclic offsets, respectively based on the four values ​​of the 2 HARQ-ACK bits, is π / 2.

3. Terminal (20), according to claim 1 or 2, characterized in that the uplink control information, which is transmitted using the first uplink control channel format, is transmitted through 1 or 2 symbols, and the number of bits of the uplink control information is 2.

4. Terminal (20), according to any one of claims 1 to 3, characterized in that, when the control section (401) uses the first uplink control channel format, the control section (401) does not map a demodulation reference signal within resource blocks that is assigned to the uplink control channel; and when the control section (401) uses the second uplink control channel format, the control section (401) maps a demodulation reference signal within resources that are assigned to the uplink control channel.

5. Terminal (20), according to any one of claims 1 to 4, characterized in that the control section (401) applies frequency hopping in the uplink control channel.

6. Radiocommunication method for a terminal (20) characterized in that it comprises: Petition 870250059815, dated 07 / 14 / 2025, page 14 / 15 3 / 3 using, in uplink control information transmission, an uplink control channel format including a first uplink control channel format and a second uplink control channel format based on a number of bits of the uplink control information; and transmitting uplink control information in an uplink control channel, wherein the first uplink control channel format is used for transmission of a sequence obtained by applying a cyclic offset to a base sequence and is not used for transmission of a demodulation reference signal, a sequence length is 12, a cyclic offset depends on a value of the uplink control information,and the second uplink control channel format is used for transmission of uplink control information and a demodulation reference signal, and when the first uplink control channel format is used for transmission of uplink control information and a duration of the uplink control channel is a plurality of symbols, terminal (20) maps sequences to the plurality of symbols respectively and map the sequences to the same 12 subcarriers, wherein the sequences are obtained by applying cyclic shifts respectively, and the cyclic shifts depend on the same value of the uplink control information. Petition 870250059815, dated 07 / 14 / 2025, page 15 / 15,

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