Terminal, base station, transmission method and reception method

Abstract

The present invention improves frequency utilization efficiency in wireless communication. A terminal comprises: a control circuit that applies, to first information provided to a plurality of frequency resources, coefficient patterns that have been associated with second information; and a transmission circuit that transmits the first information to which the patterns have been applied.

Description

[Technical field]

[0001] The present disclosure relates to a terminal, a base station, a transmission method, and a reception method. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has completed the development of the Release 15 New Radio access technology (NR) specifications to realize 5th generation mobile communication systems (5G).

[0003] In Release 16 NR, work is underway to develop specifications for extending NR functions. For example, functional extensions are being considered to enable NR to be used in unlicensed frequency bands (or unlicensed bands) used in wireless systems such as WiFi (registered trademark) (see, for example, Non-Patent Document 1). [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] RP-191575, “Revised WID on NR-based Access to Unlicensed Spectrum,” Qualcomm, June 2019. [Non-Patent Document 2] 3GPP TS38.211 V15.6.0, “3GPP TSG-RAN NR Physical channels and modulation (Release 15),” June 2019. [Non-Patent Document 3] 3GPP TS38.213 V15.6.0, “3GPP TSG-RAN NR Physical layer procedures for control (Release 15),” June 2019. [Non-Patent Document 4] 3GPP TSG RAN WG1 Meeting #98, “Draft Report of 3GPP TSG RAN WG1 #97 v0.3.0,” August 2019. [Non-Patent Document 5] S. Hara and R. Prasad, “Overview of multicarrier CDMA,” IEEE Communications Magazine, Vol.35, No.12, 1997. Summary of the Invention

[0005] An unlicensed frequency band is a band that does not require a radio station license if certain conditions are met (for example, it is called an unlicensed band). In addition, functional extension (or operation) in an unlicensed frequency band is also called, for example, "NR-U: NR Unlicensed".

[0006] In NR, for example, NR-U is effective as a complementary tool for traffic offloading to accommodate the rapidly increasing traffic in cellular communications.

[0007] However, there is room for improvement in terms of frequency efficiency (eg, spectral efficiency) in wireless communications.

[0008] Non-limiting embodiments of the present disclosure contribute to providing a terminal, a base station, a transmission method, and a reception method that can improve frequency utilization efficiency in wireless communication.

[0009] A terminal according to one embodiment of the present disclosure includes a control circuit that applies a pattern of coefficients associated with second information to first information allocated to a plurality of frequency resources, and a transmission circuit that transmits the first information to which the pattern has been applied.

[0010] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0011] According to an embodiment of the present disclosure, it is possible to improve frequency utilization efficiency in wireless communication.

[0012] Further advantages and benefits of an embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features. [Brief description of the drawings]

[0013] [Figure 1] A diagram showing an example of an interlace configuration [Diagram 2] FIG. 1 shows an example of interlace allocation. [Diagram 3] A block diagram showing an example of the configuration of a portion of a base station. [Figure 4] Block diagram showing an example of a partial configuration of a terminal [Diagram 5] Block diagram showing a configuration example of a base station [Figure 6] Block diagram showing an example of a terminal configuration [Figure 7] Flowchart showing an example of the operation of a terminal [Figure 8] An example of PUCCH format 1 [Figure 9] A diagram showing an example of application of a pattern using a cyclic shift sequence. [Figure 10] FIG. 1 shows an example of application of a pattern using phase rotation. [Figure 11] A diagram showing an example of application of a pattern using sequence numbers [Figure 12] FIG. 1 is a diagram showing an example of correspondence between information bits and patterns. [Figure 13]FIG. 1 is a diagram showing an example of a peak transmission signal power to average power ratio characteristic. [Figure 14] A diagram showing an example of application of a pattern related to variation 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0015] [Interlace Allocation] In uplink transmission in an unlicensed frequency band, for example, it is assumed that the transmission bandwidth (e.g., OCB: Occupied Channel Bandwidth) of a terminal (e.g., also called UE: User Equipment) is limited to a specified bandwidth or more. In NR-U, for example, application of interlace allocation (also called interlace transmission) to channels for uplink transmission of a terminal is under consideration. Note that the channel for uplink transmission may include, for example, an uplink data channel (e.g., PUSCH: Physical Uplink Shared Channel) or an uplink control channel (e.g., PUCCH: Physical Uplink Control Channel).

[0016] In interlace allocation, for example, a transmission unit (e.g., called an "interlace") in uplink transmission is composed of resources in a plurality of frequency bands (e.g., called clusters) that are arranged at equal (or uneven) intervals in the frequency direction within the system band. Each cluster is composed of, for example, one or more consecutive frequency units. The frequency unit may be, for example, a resource block (RB: Resource Block, or PRB: Physical RB) or a subcarrier.

[0017] FIG. 1 shows an example of an interlace configuration. In the example shown in FIG. 1, the system band is 20 MHz, the subcarrier interval is 30 kHz, one RB is composed of 12 subcarriers, and one interlace is composed of 10 RBs (in other words, 10 clusters). As shown in FIG. 1, when the system band is configured to 20 MHz (for example, 50 RBs), five interlaces #0 to #4 can be configured. For example, in FIG. 1, each of the 10 clusters is configured with five consecutive RBs. In other words, each of the interlaces #0 to #4 includes RBs that are arranged at equal intervals of 5 RBs in the frequency domain. Note that the number of RBs that configure one interlace (in other words, the number of clusters) is not limited to 10 and may be another number. Also, the number of RBs included in each cluster (in other words, the number of interlaces) is not limited to 5 and may be another number.

[0018] [Uplink Control Information (UCI)] In NR, a terminal transmits uplink control information (UCI) to a base station (also called, for example, a gNB or eNB) using an uplink control channel (for example, PUCCH). The UCI may include, for example, a response signal (also called, for example, Acknowledgement / Negative Acknowledgement (ACK / NACK) or HARQ-ACK) indicating an error detection result of a downlink data signal (for example, Physical Downlink Shared Channel (PDSCH)), downlink channel state information (for example, Channel State Information (CSI)), or an uplink radio resource allocation request (for example, Scheduling Request (SR)).

[0019] In NR, for example, PUCCH format 0 (also referred to as NR PUCCH format 0, for example) or PUCCH format 1 (also referred to as NR PUCCH format 1, for example) is used as a signal format when a terminal transmits 1- or 2-bit UCI (see, for example, Non-Patent Documents 2 or 3). PUCCH format 0 is composed of, for example, 1 or 2 symbols, and PUCCH format 1 is composed of, for example, any one of 3 to 14 symbols.

[0020] [Transmission methods in unlicensed frequency bands] Even in NR-U, when a terminal transmits 1- or 2-bit UCI, it is assumed that PUCCH format 0 or PUCCH format 1 is used.

[0021] However, since PUCCH format 0 and PUCCH format 1 are configured with 1 RB, they cannot satisfy, for example, the requirements for OCB in unlicensed frequency bands.

[0022] Therefore, for example, in order to satisfy the requirements of OCB, it is conceivable to extend PUCCH format 0 and PUCCH format 1 to interlace allocation. For example, as shown in Fig. 2, a method is conceivable in which a terminal transmits a signal of PUCCH format 0 or PUCCH format 1 consisting of one RB by repeatedly allocating it to multiple PRBs included in an interlace (interlace #0 in the example of Fig. 2).

[0023] The extension of PUCCH format 0 and PUCCH format 1 signals to an interlaced allocation may, for example, meet conditions in unlicensed spectrum (eg, OCB requirements).

[0024] However, in the interlaced allocation for PUCCH format 0 and PUCCH format 1 signals, one terminal transmits one or two information bits, so more radio resources are occupied compared to NR (e.g., one PRB), and the frequency utilization efficiency may decrease.

[0025] As a method for suppressing the decrease in frequency utilization efficiency, for example, there is a method of using Multi-Carrier Code Division Multiple Access (MC-CDMA) in which the same signal is repeatedly allocated to multiple RBs and further an orthogonal spreading code (for example, OCC: Orthogonal Cover Code) is applied (see, for example, Non-Patent Document 5). In MC-CDMA that applies OCC, signals from multiple terminals can be multiplexed into the same time and frequency resources by using orthogonal spreading codes, thereby improving frequency utilization efficiency.

[0026] However, the unlicensed frequency band is expected to be applied to, for example, small cells. The number of terminals in a small cell is expected to be smaller than the number of terminals in a macro cell. Therefore, in the unlicensed frequency band, it is difficult to obtain the effect of improving frequency utilization efficiency by multiplexing multiple terminals using MC-CDMA.

[0027] Furthermore, when a PUCCH format 0 or PUCCH format 1 signal is simply repeatedly arranged in multiple RBs included in an interlace and transmitted, the terminal's peak-to-average power ratio (PAPR) or cubic metric (CM) may increase. In order to suppress an increase in PAPR or CM (hereinafter, also referred to as "PAPR / CM"), for example, switching (in other words, cycling) a cyclic shift sequence, phase rotation, or sequence number applied to a PUCCH format 0 or PUCCH format 1 signal for each of multiple PRBs included in an interlace has been considered (see, for example, Non-Patent Document 4).

[0028] However, there has been no sufficient study on a method of switching the cyclic shift sequence, phase rotation, or sequence number applied to a signal of PUCCH format 0 or PUCCH format 1. In addition, for example, in MC-CDMA to which the above-mentioned OCC is applied, there is a possibility that an increase in PAPR / CM cannot be suppressed even if an orthogonal spreading code such as a Walsh-Hadamard code or a Discrete Fourier Transform (DFT) code is simply applied.

[0029] Therefore, in one embodiment of the present disclosure, a method for suppressing an increase in PAPR / CM and improving frequency utilization efficiency in a case where the same signal is repeatedly allocated to multiple frequency resources and transmitted, such as in an interlaced allocation, will be described.

[0030] For example, in one embodiment of the present disclosure, a terminal repeatedly allocates the same signal to multiple frequency resources (e.g., each RB on an interlace) and transmits the signal. Here, a signal repeatedly allocated to multiple frequency resources is defined as a "basic transmission unit" (e.g., a basic unit). Note that a unit (or transmission unit) of a signal repeatedly allocated to multiple frequency resources may be defined by a name other than the "basic transmission unit."

[0031] The basic transmission unit may be, for example, a signal of PUCCH format 0 or PUCCH format 1 configured with one RB for transmitting one or two bits. Note that the basic transmission unit is not limited to PUCCH format 0 and PUCCH format 1, and may be another signal. For example, the basic transmission unit may be a signal of another PUCCH format defined in NR or LTE, or may be another channel different from PUCCH (for example, PUSCH or PRACH: Physical Random Access Channel).

[0032] In addition, in one embodiment of the present disclosure, for example, a cyclic shift amount or a phase rotation amount is applied to each of a plurality of frequency resources in which a basic transmission unit is repeatedly arranged. Alternatively, when the basic transmission unit is a sequence transmission, a sequence number of a transmission sequence may be set in each of a plurality of frequency resources in which the basic transmission unit is repeatedly arranged. By applying a cyclic shift amount, a phase rotation amount, or a sequence number of a transmission sequence to each of a plurality of frequency resources, an increase in PAPR / CM can be suppressed.

[0033] In addition, in one embodiment of the present disclosure, for example, a set (or an element sequence) including a cyclic shift sequence (in other words, a cyclic shift amount), a phase rotation amount, or a sequence number of a transmission sequence applied to each of a plurality of frequency resources as an element is defined as a "pattern." For example, a pattern is a pattern of a coefficient (for example, a cyclic shift sequence, a phase rotation amount, or a transmission sequence) applied (in other words, multiplied) to a basic transmission unit.

[0034] For example, in the interlace configuration example shown in FIG. 1 or FIG. 2, one interlace is composed of 10 RBs (in other words, 10 clusters), so the pattern includes 10 elements (e.g., cyclic shift amount, phase rotation amount, or sequence number) applied to each RB.

[0035] For example, a terminal selects one pattern from among a plurality of patterns and transmits a signal based on the selected pattern. For example, information bits are assigned to each of the plurality of patterns. This assignment of information bits allows the terminal to transmit information bits by selecting a pattern in addition to information bits transmitted by a basic transmission unit, for example, thereby improving frequency utilization efficiency. In addition, the plurality of patterns selectable by the terminal may be, for example, patterns that suppress an increase in PAPR / CM.

[0036] As a result, for example, when the same signal is repeatedly allocated to a plurality of frequency resources and transmitted using interlaced allocation, it is possible to suppress an increase in PAPR / CM and improve frequency utilization efficiency.

[0037] [Communication system overview] The communication system according to each embodiment of the present disclosure includes a base station 100 and a terminal 200.

[0038] Fig. 3 is a block diagram showing a configuration example of a part of a base station 100 according to an embodiment of the present disclosure. In the base station 100 shown in Fig. 3, a receiver (e.g., corresponding to a receiver circuit) receives first information (e.g., a basic transmission unit) arranged in a plurality of frequency resources (e.g., RBs included in an interlace). A controller (e.g., corresponding to a control circuit) detects second information associated with a pattern of coefficients applied to the first information.

[0039] Fig. 4 is a block diagram showing a configuration example of a part of a terminal 200 according to an embodiment of the present disclosure. In the terminal 200 shown in Fig. 4, a control unit (e.g., a control circuit) applies a coefficient pattern associated with second information to first information arranged in a plurality of frequency resources. A transmission unit (e.g., a transmission circuit) transmits the first information.

[0040] The "coefficient pattern" may be a pattern that includes elements such as a cyclic shift amount, a phase rotation amount, or a sequence number of a transmission sequence.

[0041] [Base station configuration] Fig. 5 is a block diagram showing an example of the configuration of a base station 100 according to the first embodiment. In Fig. 5, the base station 100 includes a control unit 101, a higher control signal generating unit 102, a downlink control information generating unit 103, an encoding unit 104, a modulation unit 105, a signal allocation unit 106, a transmitting unit 107, a receiving unit 108, an extracting unit 109, a demodulating unit 110, and a decoding unit 111. For example, the control unit 101, the demodulating unit 110, and the decoding unit 111 shown in Fig. 5 may correspond to the control unit shown in Fig. 3, and the receiving unit 108 shown in Fig. 5 may correspond to the receiving unit shown in Fig. 3.

[0042] The control unit 101, for example, determines setting information (for example, referred to as Radio Resource Control (RRC) setting information) including upper layer parameters for the terminal 200, and outputs the determined RRC setting information to the upper control signal generating unit 102, the extraction unit 109, the demodulation unit 110, and the decoding unit 111.

[0043] The RRC setting information may include, for example, setting information related to a transmission method of information bits. The setting related to the transmission method of information bits may include, for example, information on transmission parameters used to generate a "basic transmission unit", information on information bits transmitted using a "pattern" and the number of bits of the information bits, information on the pattern set in the terminal 200, and information on the association between information bits and patterns.

[0044] Furthermore, the control unit 101 determines information related to a downlink signal for transmitting a downlink data signal (e.g., PDSCH), an upper control signal, or downlink control information (e.g., DCI). The information related to the downlink signal may include, for example, information such as a modulation and coding scheme (MCS) and radio resource allocation. The control unit 101 outputs the determined information to, for example, the encoding unit 104, the modulation unit 105, and the signal allocation unit 106. Furthermore, the control unit 101 outputs the information related to the downlink signal to the downlink control information generation unit 103.

[0045] Furthermore, control section 101 determines information for terminal 200 to transmit an ACK / NACK for downlink data, and outputs the determined information to downlink control information generating section 103 and extraction section 109. The information for transmitting an ACK / NACK may include, for example, information on a PUCCH resource.

[0046] Furthermore, the control unit 101 determines information for the terminal 200 to transmit uplink data, and outputs the determined information to the downlink control information generation unit 103, the extraction unit 109, the demodulation unit 110, and the decoding unit 111. The information for transmitting the uplink data may include, for example, a coding and modulation scheme and radio resource allocation.

[0047] The higher-level control signal generating section 102 generates a higher-level layer control signal bit sequence based on information (eg, RRC setting information) input from the control section 101, and outputs the higher-level layer control signal bit sequence to the encoding section 104.

[0048] The downlink control information generating unit 103 generates a downlink control information (for example, DCI) bit string based on information input from the control unit 101, and outputs the generated DCI bit string to the encoding unit 104. Note that control information may be transmitted to multiple terminals. For this reason, the downlink control information generating unit 103 may scramble the PDCCH that transmits the DCI using terminal-specific identification information. The terminal-specific identification information may be, for example, any of information such as a Cell Radio Network Temporary Identifier (C-RNTI) and a Modulation and Coding Scheme C-RNTI (MCS-C-RNTI), or may be other information (for example, another RNTI).

[0049] The encoding unit 104 encodes downlink data (for example, also referred to as downlink UP data), a bit string input from the higher control signal generating unit 102, or a DCI bit string input from the downlink control information generating unit 103, based on information input from the control unit 101 (for example, information related to the coding rate). The encoding unit 104 outputs the encoded bit string to the modulation unit 105.

[0050] The modulation unit 105 modulates the coded bit sequence input from the coding unit 104, for example, based on information input from the control unit 101 (for example, information regarding a modulation method), and outputs the modulated signal (for example, a symbol sequence) to the signal allocation unit 106.

[0051] The signal allocation unit 106 maps the symbol sequence (including, for example, downlink data or a control signal) input from the modulation unit 105 to the radio resource based on the information indicating the radio resource input from the control unit 101. The signal allocation unit 106 outputs the downlink signal onto which the signal has been mapped to the transmission unit 107.

[0052] The transmitting unit 107 performs a transmission waveform generation process such as Orthogonal Frequency Division Multiplexing (OFDM) on the signal input from the signal allocation unit 106. In addition, in the case of OFDM transmission that adds a cyclic prefix (CP), the transmitting unit 107 performs an Inverse Fast Fourier Transform (IFFT) process on the signal and adds a CP to the signal after IFFT. In addition, the transmitting unit 107 performs RF processes such as D / A conversion and up-conversion on the signal, and transmits the radio signal to the terminal 200 via an antenna.

[0053] The receiving unit 108 performs RF processing such as down-converting or A / D conversion on the uplink signal received from the terminal 200 via the antenna. In addition, in the case of OFDM transmission, the receiving unit 108 performs Fast Fourier Transform (FFT) processing on the received signal and outputs the obtained frequency domain signal to the extracting unit 109.

[0054] The extraction unit 109 extracts a radio resource portion from which the uplink signal transmitted by the terminal 200 is transmitted based on the information input from the control unit 101 , and outputs the extracted radio resource portion to the demodulation unit 110 .

[0055] The demodulation unit 110 demodulates the signal input from the extraction unit 109 (e.g., at least one of UCI and uplink data) based on information input from the control unit 101 (e.g., information related to the basic transmission unit and pattern). The demodulation unit 110 detects, for example, a pattern applied to the signal input from the extraction unit 109. The demodulation unit 110 also detects (in other words, demodulates) information bits (second information) associated with the detected pattern. The demodulation unit 110 also demodulates, for example, the basic transmission unit included in the signal input from the extraction unit 109 to obtain a demodulation result related to the first information. The demodulation unit 110 outputs, for example, the demodulation result to the decoding unit 111.

[0056] The decoding unit 111 performs error correction decoding on at least one of the UCI and the uplink data based on the information input from the control unit 101 and the demodulation result input from the demodulation unit 110 (the demodulation result on the first information or the demodulation result on the second information, or both), and obtains a decoded received bit sequence. Note that the decoding unit 111 does not need to perform error correction decoding on the UCI transmitted without error correction coding.

[0057] [Device configuration] Fig. 6 is a block diagram showing a configuration example of terminal 200 according to an embodiment of the present disclosure. For example, in Fig. 6, terminal 200 includes receiving unit 201, extracting unit 202, demodulating unit 203, decoding unit 204, control unit 205, encoding unit 206, modulating unit 207, signal allocating unit 208, and transmitting unit 209. For example, control unit 205, encoding unit 206, modulating unit 207, and signal allocating unit 208 shown in Fig. 6 may correspond to the control unit shown in Fig. 4, and transmitting unit 209 shown in Fig. 6 may correspond to the transmitting unit shown in Fig. 4.

[0058] The receiver 201 receives a downlink signal (e.g., downlink data or downlink control information) from the base station 100 via an antenna, and performs RF processing such as downconvert or A / D conversion on the wireless received signal to obtain a received signal (baseband signal). When receiving an OFDM signal, the receiver 201 performs FFT processing on the received signal to convert the received signal into the frequency domain. The receiver 201 outputs the received signal to the extractor 202.

[0059] Based on information relating to the radio resource of the downlink control information input from the control unit 205, the extraction unit 202 extracts a radio resource portion including the downlink control information from the received signal input from the receiving unit 201, and outputs the extracted radio resource portion to the demodulation unit 203. Also, based on information relating to the radio resource of the data signal input from the control unit 205, the extraction unit 202 extracts a radio resource portion including the downlink data, and outputs the extracted radio resource portion to the demodulation unit 203.

[0060] Demodulation section 203 demodulates the signal inputted from extraction section 202 and outputs the demodulated result to decoding section 204 .

[0061] The decoding unit 204 performs error correction decoding on the demodulation result input from the demodulation unit 203, and obtains, for example, downlink reception data, a higher layer control signal, or downlink control information. The decoding unit 204 outputs the higher layer control signal and the downlink control information to the control unit 205, and outputs the downlink reception data. The decoding unit 204 may also generate an ACK / NACK based on the decoding result of the downlink reception data. The ACK / NACK may be output to, for example, the encoding unit 206.

[0062] The control unit 205 determines information regarding the basic transmission unit and pattern based on, for example, configuration information regarding the transmission method of information bits included in the upper layer control signal information input from the decoding unit 204, and outputs the determined information to the encoding unit 206, the modulation unit 207, and the signal allocation unit 208.

[0063] Furthermore, the control unit 205 determines information regarding the transmission of an uplink signal, and outputs the determined information to the encoding unit 206 and the signal allocation unit 208. Furthermore, the control unit 205 determines information regarding the reception of a downlink signal, and outputs the determined information to the extraction unit 202.

[0064] Encoding section 206 encodes at least one signal of UCI or uplink data based on information (e.g., information on a basic transmission unit) input from control section 205, and outputs the encoded bit sequence to modulation section 207. Note that terminal 200 may transmit an uplink signal (e.g., UCI) without performing error correction coding in encoding section 206.

[0065] The modulation unit 207 modulates the coded bit sequence input from the coding unit 206 based on information input from the control unit 205, and outputs the modulated signal (symbol sequence) to the signal allocation unit 208. For example, with respect to a bit sequence transmitted in a basic transmission unit, the modulation unit 207 may generate a basic transmission unit based on the bit sequence and output the basic transmission unit to the signal allocation unit 208. Also, with respect to a bit sequence transmitted according to a pattern, the modulation unit 207 selects a pattern based on the bit sequence, and outputs information on the selected pattern to the signal allocation unit 208.

[0066] The signal allocating unit 208 maps the signal input from the modulating unit 207 to a radio resource based on information input from the control unit 205, and outputs the uplink signal to which the signal is mapped to the transmitting unit 209. For example, the signal allocating unit 208 may repeatedly allocate the basic transmission unit to a plurality of frequency resources (e.g., interlaces). Furthermore, the signal allocating unit 208 may apply a pattern (e.g., a cyclic shift amount, a phase rotation amount, or a sequence number) to the basic transmission unit allocated to a plurality of frequency resources.

[0067] The transmitting unit 209 generates a transmission signal waveform, such as OFDM, for the signal input from the signal allocating unit 208. In addition, in the case of OFDM transmission using a CP, the transmitting unit 209 performs IFFT processing on the signal and adds a CP to the signal after IFFT. Alternatively, in the case of generating a single carrier waveform, the transmitting unit 209 may add a DFT (Discrete Fourier Transform) unit after the modulating unit 207 or before the signal allocating unit 208 (not shown). In addition, the transmitting unit 209 performs RF processing, such as D / A conversion and up-conversion, on the transmission signal, and transmits the radio signal to the base station 100 via an antenna.

[0068] [Example of Operation of Base Station 100 and Terminal 200] An example of the operation of base station 100 and terminal 200 having the above configuration will be described.

[0069] FIG. 7 is a flowchart showing an example of the operation of terminal 200 according to the present embodiment.

[0070] 7, terminal 200 acquires, for example, configuration information related to a method of transmitting information bits (ST101). The configuration information may be configured in terminal 200 from base station 100 by a control signal such as a higher layer parameter (for example, an RRC parameter) or DCI, or may be configured in advance in terminal 200 according to a standard.

[0071] The configuration information regarding the method of transmitting information bits may include, for example, information on transmission parameters used to generate a "basic transmission unit", information on the information bits and number of bits to be transmitted using a "pattern", information on the pattern set in terminal 200, or information on the correspondence between information bits and patterns.

[0072] Furthermore, the information bits may be UCI such as the above-mentioned ACK / NACK, SR, or CSI, uplink U-plane data, or other information.

[0073] Terminal 200 generates information bits (ST102).

[0074] Terminal 200 generates a basic transmission unit based on, for example, setting information related to a method of transmitting information bits and the generated information bits (ST103).

[0075] Terminal 200, for example, arranges basic transmission units in a plurality of frequency resources (for example, interlaces) respectively (ST104). Terminal 200 also applies a pattern to the basic transmission units arranged in each of the plurality of frequency resources based on, for example, configuration information related to a method of transmitting information bits (ST104).

[0076] Terminal 200 generates a transmission signal including a signal in which a basic transmission unit is allocated to a plurality of frequency resources, and transmits the signal to base station 100 (ST105).

[0077] [How to generate a basic transmission unit] Next, an example of generating a basic transmission unit will be described.

[0078] The basic transmission unit may be a signal in a signal format for transmitting 1 or 2 bits, such as PUCCH format 0 or PUCCH format 1 defined in Release 15 NR. The basic transmission unit is not limited to the above, and may be, for example, a signal in another PUCCH format defined in NR or LTE, or a signal format of another channel (for example, PUSCH or PRACH). The number of information bits transmitted in the basic transmission unit is not limited to 1 or 2 bits.

[0079] In the following, as an example, a case where PUCCH format 0 or PUCCH format 1 is applied to the basic transmission unit will be described.

[0080] <PUCCH format 0> In PUCCH format 0, the transmitting side (eg, terminal 200) transmits a signal in which different cyclic shift sequences (eg, sequence length 12) are mapped to one OFDM symbol and one RB (eg, 12 subcarriers) according to information bits.

[0081] The receiving side (eg, base station 100) demodulates the information bits based on the cyclic shift sequence, for example, by maximum likelihood determination using correlation processing.

[0082] For example, a constant amplitude zero auto correlation (CAZAC) sequence may be used as the cyclic shift sequence, which has low PAPR characteristics.

[0083] Furthermore, for example, in the case of PUCCH format 0 using two OFDM symbols, terminal 200 may transmit the above-described configuration by repeating it for two symbols. At this time, frequency hopping may be applied between the two symbols.

[0084] <PUCCH format 1> A PUCCH format 1 signal is made up of, for example, 4 to 14 OFDM symbols and 1 RB (for example, 12 subcarriers).

[0085] In addition, in PUCCH format 1, for example, a modulated signal based on ACK / NACK is multiplied after a different cyclic shift sequence (e.g., sequence length 12) is assigned between terminals 200. For example, a 1-bit ACK / NACK is multiplied by a modulated signal based on binary phase shift keying (BPSK), and a 2-bit ACK / NACK is multiplied by a modulated signal based on quadrature phase shift keying (QPSK).

[0086] In addition, in PUCCH format 1, modulated signals (for example, ACK / NACK) are code-spread based on an orthogonal cover code (OCC) corresponding to the number of symbols. The spread signals are allocated to, for example, odd-numbered OFDM symbols.

[0087] Furthermore, base station 100 code-spreads a reference signal (RS) (e.g., Demodulation reference signal (DMRS)) for decoding information bits transmitted from terminal 200 by terminal 200 using a cyclic shift sequence and an orthogonal spreading code (e.g., OCC). The code-spread reference signal is allocated to, for example, an even-numbered OFDM symbol.

[0088] In this example, for example, the first OFDM symbol number in a slot is set to “0.” Furthermore, for example, a CAZAC sequence may be used as the cyclic shift sequence.

[0089] As an example, FIG. 8 shows the structure of PUCCH format 1 having four OFDM symbols.

[0090] As shown in Fig. 8, UCI (for example, ACK / NACK information) is allocated to the first and third odd-numbered OFDM symbols, and reference signals are allocated to the zeroth and second even-numbered OFDM symbols.

[0091] Furthermore, frequency hopping may be applied to PUCCH format 1. By applying frequency hopping, it is possible to improve reception characteristics by frequency diversity.

[0092] The method of generating a basic transmission unit when PUCCH format 0 or PUCCH format 1 is applied has been described above.

[0093] The basic transmission unit is not limited to PUCCH format 0 or PUCCH format 1 consisting of one RB, and may have other configurations. For example, the sequence length of PUCCH format 0 or PUCCH format 1 may be longer than 12 (e.g., 24), and the basic transmission unit may be composed of multiple RBs.

[0094] Furthermore, the basic transmission unit may be generated based on a format in which multiple RBs are used (for example, PUCCH format 2 or PUCCH format 3) (for example, see Non-Patent Document 2 or 3).

[0095] In addition, the basic transmission unit is not limited to the PUCCH format, and may be generated based on the transmission format of other channels, for example, the basic transmission unit may be generated based on the PUSCH or PRACH.

[0096] [Repeated placement of basic transmission units and application of patterns] For example, terminal 200 repeatedly allocates the generated basic transmission unit to multiple frequency resources (for example, each RB included in an interlace).

[0097] Furthermore, terminal 200 applies a pattern (eg, an element such as a cyclic shift amount, a phase rotation amount, or a sequence number) to a basic transmission unit allocated to each of a plurality of frequency resources.

[0098] The terminal 200 may repeatedly allocate the basic transmission unit to multiple frequency resources, and generate a time-domain transmission signal by applying, for example, an inverse discrete Fourier transform (IDFT) or an inverse fast Fourier transform (IFFT) to the frequency-domain signal after applying the pattern.

[0099] For example, the pattern is a set including elements (e.g., cyclic shift amounts, phase rotation amounts, or sequence numbers) corresponding to a plurality of frequency resources. In other words, the pattern includes elements in the same number as the number of frequency resources (e.g., RBs included in an interlace) in which the basic transmission units are repeatedly arranged.

[0100] 9, 10, and 11 respectively show examples of applying patterns including elements of a cyclic shift amount, a phase rotation amount, and a sequence number when PUCCH format 0 or PUCCH format 1 is used as the basic transmission unit.

[0101] FIG. 9 shows an example of a case where a pattern including the amount of cyclic shift as an element is applied.

[0102] For example, when the amount of cyclic shift in a basic transmission unit (in other words, PUCCH format 0 or PUCCH format 1) is "m", the amount of cyclic shift in the n-th frequency resource "m'(n)" is the amount of cyclic shift Δ n is given by the following equation (1). m'(n) = m + Δ n Mod M RB (1)

[0103] Here, n=0 to N-1, and N is the number of frequency resources in which the basic transmission unit is repeatedly arranged. For example, in the case of the interlace configuration example shown in FIG. 1 or 2, one interlace is composed of 10 RBs, so N=10.

[0104] Also, M RB is the applicable amount of cyclic shift (for example, the upper limit). For example, when PUCCH format 0 or PUCCH format 1 is used as the basic transmission unit, the sequence length of the cyclic shift sequence is 12, so M RB =12.

[0105] FIG. 10 shows an example of a case where a pattern including the amount of phase rotation as an element is applied.

[0106] For example, for a basic transmission unit arranged in the n-th frequency resource, terminal 200 calculates the phase rotation amount φ corresponding to the n-th element of the pattern. n Multiply by.

[0107] FIG. 11 shows an example of a case where a pattern including a sequence number as an element is applied.

[0108] For example, when the sequence number of the CAZAC sequence used in the basic transmission unit (in other words, PUCCH format 0 or PUCCH format 1) is "u", the sequence number "u'(n)" in the n-th frequency resource is the sequence number δ corresponding to the n-th element of the pattern. n is given by the following equation (2). u'(n) = u + δ n mod U (2)

[0109] Here, n=0 to N-1, and N is the number of frequency resources in which the basic transmission unit is repeatedly arranged. For example, in the case of the interlace configuration example shown in FIG. 1 or 2, one interlace is composed of 10 RBs, so N=10.

[0110] Furthermore, U is an applicable sequence number (e.g., an upper limit value). For example, in NR, U=30 CAZAC sequences are set.

[0111] Also, the sequence number "Z n " may be set to the sequence number u'(n) in the nth frequency resource. For example, the sequence number u'(n) in the nth frequency resource may be expressed as the following equation (3) instead of equation (2). u'(n) = Z n (3)

[0112] [Pattern determination and design method] The terminal 200 transmits information bits included in the basic transmission unit and information bits associated with the pattern to the base station 100. In other words, the terminal 200 explicitly transmits information bits (e.g., first information) to the base station 100 by the basic transmission unit and implicitly transmits information bits (e.g., second information) to the base station 100 by selecting a pattern.

[0113] A set of patterns applicable to terminal 200 (in other words, a group of candidate patterns) and the correspondence between each pattern and information bits (sequences) may be predefined, for example, by a standard, or may be set (in other words, notified) from base station 100 to terminal 200 by a control signal such as an RRC parameter or DCI.

[0114] FIG. 12 shows an example of association between patterns and information bits transmitted from terminal 200 to base station 100 according to the patterns.

[0115] As shown in FIG. 12, for example, when the number of information bits notified to base station 100 by pattern selection is M bits, terminal 200 has M A set containing two patterns may be set. M Each pattern is associated with an information bit (sequence).

[0116] As described above, a pattern is a set whose elements include, for example, the amount of cyclic shift, the amount of phase rotation, or the sequence number applied to each frequency resource.

[0117] As an example, when a basic transmission unit is generated based on PUCCH format 0 or PUCCH format 1, a CAZAC sequence with a sequence length of 12 may be applied to the basic transmission unit. In addition, for example, in the case of the interlace configuration example shown in Fig. 1 or 2, one interlace is composed of 10 RBs, so N = 10. In addition, U = 30 CAZAC sequences are prepared in NR.

[0118] In this case, the number of patterns that can be generated in terminal 200 is 12 for patterns using cyclic shift sequences. N In the case of a pattern using phase rotation, if the number of candidates for the amount of phase rotation is X, then N 30 for the pattern using sequence numbers. N There are 10.

[0119] Here, not all patterns are necessarily suitable for repeated transmission of a basic transmission unit and for transmission of information bits associated with a pattern. For a pattern that terminal 200 can use or a pattern to be assigned to terminal 200, there is room for considering, for example, suppression of increase in PAPR / CM of a transmission signal. Furthermore, when information bits are transmitted in association with a pattern, base station 100 determines a pattern corresponding to the information bits transmitted by terminal 200. Therefore, for a pattern that terminal 200 can use or a pattern to be assigned to terminal 200, there is room for considering, for example, the reception performance of base station 100.

[0120] First, a pattern for suppressing an increase in PAPR / CM of a transmission signal (in other words, low PAPR / CM) will be described.

[0121] Fig. 13 shows an example of PAPR characteristics when a pattern using a cyclic shift sequence is applied to repeated transmission of a basic transmission unit. In Fig. 13, the horizontal axis indicates the PAPR value (dB), and the vertical axis indicates the Complementary Cumulative Distribution Function (CCDF). Also, Fig. 13 shows an example in which the system band is 20 MHz, the subcarrier interval is 30 kHz, 1 RB is composed of 12 subcarriers, and 1 interlace is composed of 10 RBs (in other words, 10 clusters), as in Fig. 1.

[0122] FIG. 13 shows an example of PAPR characteristics when the following six patterns are applied to interlace #0 of the five interlaces #0 to #4 shown in FIG. Pattern #1 (denoted as P1): [0 1 2 3 4 5 6 7 8 9] Pattern #2 (denoted as P2): [0 2 4 6 8 10 0 2 4 6] Pattern #3 (denoted as P3): [0 3 6 9 0 3 6 9 0 3] Pattern #4 (denoted as P4): [0 4 8 0 4 8 0 4 8 0] Pattern #5 (denoted as P5): [0 5 10 3 8 1 6 11 4 9] Pattern #6 (denoted as P6): [0 6 0 6 0 6 0 6 0 6]

[0123] As shown in FIG. 13, pattern #1 and pattern #5 have lower PAPR characteristics compared to the other patterns #2, #3, #4 and #6.

[0124] Also, as shown in FIG. 13, the PAPR is greatest in the order of pattern #6, pattern #4, pattern #3 and pattern #2.

[0125] According to the PAPR characteristic of Fig. 13, for example, the more the elements contain the same cyclic shift amount, the higher the PAPR. In other words, the fewer the types of cyclic shift amount contained in the elements, the higher the PAPR may be. For example, in Fig. 13, pattern #6 contains two types of cyclic shift amount, 0 and 6, each of which has five cyclic shift amounts, whereas pattern #1 and pattern #5 contain one each of 10 types of cyclic shift amount.

[0126] Therefore, from the viewpoint of suppressing an increase in PAPR / CM of a transmission signal, a pattern that does not include elements with the same value may be set in terminal 200. In other words, the more elements with different values ​​included in a pattern, the higher the effect of suppressing an increase in PAPR / CM by the pattern. Multiple elements included in a pattern may have different values, for example, as in the above-mentioned pattern #1 or #5.

[0127] Next, a pattern for improving the reception performance in base station 100 will be described.

[0128] For example, in each frequency resource in which the basic transmission unit is repeatedly arranged, elements between different patterns (e.g., multiple candidates of a pattern) may not be set to the same value. In other words, in each of the multiple frequency resources, elements between multiple patterns may be different values ​​from each other.

[0129] For example, the receiving side (e.g., base station 100) detects the pattern applied to the received signal to determine the information bits transmitted by the pattern. When detecting the pattern, if the same value is set for elements between different patterns in a certain frequency resource, the base station 100 cannot distinguish which pattern is detected in that frequency resource, and the pattern detection accuracy may decrease. Therefore, the reception performance of the information bits associated with the pattern in the base station 100 may deteriorate.

[0130] On the other hand, when different values ​​are set for elements between different patterns in each frequency resource, the base station 100 can distinguish which pattern is detected in the frequency resource, so that the pattern detection accuracy can be improved. Therefore, the reception performance of the information bits associated with the patterns in the base station 100 can be improved.

[0131] Furthermore, when a basic transmission unit is generated based on PUCCH format 0 or PUCCH format 1, the smaller the sum of cross-correlation between patterns in a transmission sequence after application of the patterns is, the more the reception performance at base station 100 can be improved.

[0132] For example, when a pattern using a cyclic shift sequence is applied and different cyclic shift amounts are set between different patterns in each frequency resource, the sum of cross-correlation becomes 0. Also, when a pattern using a sequence number is applied, the more different sequence numbers are set between different patterns in each frequency resource, the smaller the sum of cross-correlation becomes.

[0133] The patterns for improving the reception performance in base station 100 have been described above.

[0134] For example, in FIG. 9, FIG. 10, and FIG. 11, four types of patterns are associated with four types of information (in other words, two information bits: 00, 01, 10, and 11), respectively.

[0135] For example, in the example shown in Fig. 9, the ten cyclic shift amounts that are elements included in each of the four types of patterns have different values. Similarly, in the example shown in Fig. 10, the ten phase rotation amounts that are elements included in each of the four types of patterns have different values. Similarly, in the example shown in Fig. 11, the ten sequence numbers that are elements included in each of the four types of patterns have different values.

[0136] In addition, in each of the frequency resources shown in FIG. 9, FIG. 10, and FIG. 11, elements (for example, cyclic shift amount, phase rotation amount, or sequence number) between the four types of patterns are different values.

[0137] Therefore, terminal 200 can suppress an increase in PAPR / CM of a transmission signal by applying to a basic transmission unit each pattern shown in Fig. 9, Fig. 10, or Fig. 11. Furthermore, terminal 200 can improve the receiving performance of base station 100 by applying to a basic transmission unit each pattern shown in Fig. 9, Fig. 10, or Fig. 11.

[0138] In addition, the present invention is not limited to the case where multiple elements included in each pattern have different values, and for example, some elements may have the same value. In addition, in each frequency resource, the present invention is not limited to the case where elements between multiple patterns have different values, and for example, some elements between patterns may have the same value.

[0139] Furthermore, the values ​​set for the elements included in each pattern (for example, elements corresponding to the n-th frequency resource) may be determined based on the same law (for example, may be read as a rule, regulation, provision, or setting) between the patterns (in other words, information bits) as shown in the examples of Figures 9, 10, and 11. In other words, a plurality of patterns (for example, a plurality of candidates) are generated based on a common law for the values ​​of information bits associated with each of the plurality of patterns.

[0140] For example, in the example of a pattern using the cyclic shift sequence shown in FIG. 9, when the cyclic shift amount in the basic transmission unit is “m”, the cyclic shift amount m′(n) in the nth frequency resource may be expressed as in the following equation (4). m'(n)=m+(n+b) mod M RB (4)

[0141] Here, b indicates a value corresponding to the information bit string. For example, the value of b may be the value X of each information bit shown in FIG. 9. RB For example, when a basic transmission unit is generated based on PUCCH format 0 or PUCCH format 1, M RB =12.

[0142] According to formula (4), for example, as shown in FIG. 9, the values ​​of elements corresponding to each frequency resource in four patterns are set to values ​​shifted according to the information bit value X. For example, when the information bit values ​​X associated with a plurality of patterns are different from each other, the values ​​of the elements corresponding to each frequency resource of the plurality of patterns are different from each other. Therefore, by generating patterns based on the same rule between different information bits, it is possible to prevent the same value from being set for each element between patterns.

[0143] Although an example of a cyclic shift sequence (e.g., FIG. 9) has been described, a pattern including an amount of phase rotation (e.g., FIG. 10) and a sequence number (e.g., FIG. 11) as elements may also be generated in the same manner between different information bits based on the same rule.

[0144] Furthermore, the pattern set in terminal 200 is not limited to a method in which different information bits are generated based on the same rule, and may be generated based on other methods.

[0145] [Example] Next, an example of a use case in which terminal 200 transmits information bits included in a basic transmission unit and information bits associated with a pattern will be described.

[0146] For example, there is a case where terminal 200 transmits an ACK / NACK in a basic transmission unit based on PUCCH format 0 or PUCCH format 1, and transmits an SR by selecting a pattern.

[0147] Hereinafter, as an example, an operation defined in Release 15 NR and an example operation according to an embodiment of the present disclosure in a case where a PUCCH resource for a terminal to transmit an SR and a PUCCH resource for transmitting an ACK / NACK overlap in time will be described.

[0148] <Example 1> In operation example 1, an operation will be described in a case where an ACK / NACK is transmitted using PUCCH format 0 and the PUCCH resource allocated to the ACK / NACK and the PUCCH resource set in the SR overlap in time.

[0149] In Release 15 NR, a terminal multiplexes ACK / NACK and SR into a PUCCH and transmits the multiplexed ACK / NACK. At this time, the PUCCH resource is determined based on the PUCCH resource allocated to the ACK / NACK (see, for example, Non-Patent Document 3). In addition to the PUCCH resource allocated to the ACK / NACK (for example, the amount of cyclic shift), a PUCCH resource for notifying the presence or absence of an SR (for example, the amount of cyclic shift) is used. For this reason, in Release 15 NR, the number of terminals multiplexed into the same time-frequency resource is reduced, and frequency utilization efficiency may decrease.

[0150] In contrast, in the present embodiment, terminal 200 generates, for example, in a basic transmission unit, a PUCCH format 0 signal for transmitting ACK / NACK, applies a pattern associated with the presence or absence of SR to the generated basic transmission unit, and transmits a transmission signal to base station 100.

[0151] At this time, the number of information bits notified by the pattern is 1 bit (for example, with or without SR), and the number of patterns set in terminal 200 is two.

[0152] In this embodiment, since terminal 200 transmits SR according to a pattern, an additional PUCCH resource (e.g., a cyclic shift amount) for reporting the presence or absence of SR, such as in Release 15 NR, is not required. Therefore, in this embodiment, it is possible to suppress a decrease in the number of terminals multiplexed into the same time-frequency resource, and suppress a decrease in frequency utilization efficiency.

[0153] <Example 2> In operation example 2, an operation will be described in a case where the PUCCH resource set in the SR is PUCCH format 1, an ACK / NACK is transmitted using PUCCH format 1, and the PUCCH resource allocated to the ACK / NACK and the PUCCH resource set in the SR overlap in time.

[0154] In Release 15 NR, a terminal multiplexes an ACK / NACK and an SR into a PUCCH and transmits the multiplexed ACK / NACK. In this case, in the case of positive SR (e.g., with SR), the terminal transmits the ACK / NACK using a PUCCH resource set for the SR. On the other hand, in the case of negative SR (e.g., without SR), the terminal transmits the ACK / NACK using a PUCCH resource allocated to the ACK / NACK. The base station determines the presence or absence of an SR based on, for example, the PUCCH resource in which the ACK / NACK was actually transmitted (see, for example, Non-Patent Document 3). For this reason, in Release 15 NR, the base station performs blind detection on, for example, the PUCCH resources for ACK / NACK and SR, which may result in degradation of reception performance.

[0155] In contrast, in the present embodiment, terminal 200 generates, for example, in a basic transmission unit, a PUCCH format 1 signal for transmitting ACK / NACK, applies a pattern associated with the presence or absence of SR to the generated basic transmission unit, and transmits a transmission signal to base station 100. At this time, the number of information bits notified by the pattern is 1 bit (for example, positive SR or negative SR), and the number of patterns set in terminal 200 is two.

[0156] In this embodiment, for example, base station 100 can receive SR by detecting a pattern applied to a transmission signal from terminal 200, and therefore does not need blind detection in multiple PUCCH resources as in Release 15 NR. Therefore, in this embodiment, it is possible to suppress deterioration of reception performance in base station 100.

[0157] <Example 3> In operation example 3, an operation will be described in a case where the PUCCH resource set in the SR is PUCCH format 0, an ACK / NACK is transmitted using PUCCH format 1, and the PUCCH resource allocated to the ACK / NACK and the PUCCH resource set in the SR overlap in time.

[0158] In Release 15 NR, a terminal drops the transmission of an SR and transmits an ACK / NACK using a PUCCH resource allocated to the ACK / NACK (see, for example, Non-Patent Document 3). For this reason, in Release 15 NR, an SR is not transmitted, which may cause degradation or delay in the frequency utilization efficiency of the uplink.

[0159] In contrast, in the present embodiment, terminal 200 generates, for example, in a basic transmission unit, a PUCCH format 1 signal for transmitting ACK / NACK, applies a pattern associated with the presence or absence of SR to the generated basic transmission unit, and transmits a transmission signal to base station 100. At this time, the number of information bits notified by the pattern is 1 bit (for example, positive SR or negative SR), and the number of patterns set in terminal 200 is two.

[0160] In this embodiment, terminal 200 can transmit SR to base station 100 according to a pattern without dropping the SR. Therefore, in this embodiment, it is possible to suppress deterioration of frequency utilization efficiency and delays in uplink.

[0161] Operation examples 1 to 3 have been described above.

[0162] In addition, examples of transmission of information bits based on the basic transmission unit and the pattern are not limited to the above-mentioned operation examples 1 to 3. For example, information transmitted by the pattern is not limited to SR, but may be ACK / NACK or CSI, or other information. In addition, information transmitted by the basic transmission unit is not limited to ACK / NACK, but may be SR or CSI, or other information. In addition, information bits are not limited to UCI such as ACK / NACK, SR, or CSI, but may be uplink U-plane data.

[0163] As described above, in this embodiment, terminal 200 transmits a transmission signal by applying a pattern associated with second information bits to a basic transmission unit (e.g., first information bits) that is allocated to a plurality of frequency resources such as interlace allocation. Base station 100 also receives a basic transmission unit (e.g., first information bits) that is allocated to a plurality of frequency resources such as interlace allocation. Base station 100 also detects second information bits that are associated with the pattern applied to the received basic transmission unit.

[0164] Through these processes, terminal 200 can transmit information bits according to a pattern in addition to the basic transmission unit to base station 100. Therefore, according to the present embodiment, even when the basic transmission unit is repeatedly allocated to a plurality of frequency resources for transmission, it is possible to improve frequency utilization efficiency.

[0165] Therefore, according to this embodiment, it is possible to improve frequency utilization efficiency in wireless communication, even in a band that does not require a license, such as an unlicensed frequency band.

[0166] In addition, in this embodiment, for example, by setting multiple elements included in one pattern to different values, it is possible to suppress an increase in PAPR / CM. Also, in this embodiment, for example, by setting elements in each frequency resource between multiple patterns to different values, it is possible to improve the reception performance of base station 100.

[0167] [Variation 1] When a basic transmission unit is generated based on PUCCH format 0, terminal 200 maps, for example, different cyclic shift sequences (eg, sequence length 12, cyclic shifts #0 to #11) in accordance with information bits in the basic transmission unit.

[0168] When transmitting one information bit (eg, ACK / NACK), terminal 200 transmits, for example, bit 0 (eg, NACK) with cyclic shift #0 and bit 1 (eg, ACK) with cyclic shift #6.

[0169] Furthermore, when transmitting two information bits (e.g., ACK / NACK), terminal 200 transmits, for example, bits 00 (e.g., NACK, NACK) with cyclic shift #0, bits 01 (e.g., NACK, ACK) with cyclic shift #3, bits 11 (e.g., ACK, ACK) with cyclic shift #6, and bits 10 (e.g., ACK, NACK) with cyclic shift #9.

[0170] In this case, in a pattern for improving the reception performance of base station 100, for example, as described above, a cyclic shift set in which the same cyclic shift is not included between patterns may be set in each frequency resource.

[0171] For example, when one information bit is transmitted in PUCCH format 0, the cyclic shift sets corresponding to each frequency resource (in other words, combinations of elements of each of multiple patterns) may include sets such as set #0: {0, 6}, set #1: {1, 7}, set #2: {2, 8}, set #3: {3, 9}, set #4: {4, 10}, or set #5: {5, 11}.

[0172] Also, for example, when two information bits are transmitted in PUCCH format 0, the cyclic shift sets corresponding to each frequency resource may include sets such as set #0: {0, 3, 6, 9}, set #1: {1, 4, 7, 10}, or set #2: {2, 5, 8, 11}.

[0173] By setting the cyclic shift set, for example, even when a cyclic shift sequence mapped in PUCCH format 0 and a cyclic shift sequence included in a pattern are applied, the amount of cyclic shift can be made different between patterns. Thus, according to variation 1, the same cyclic shift is not set between patterns in each frequency resource (in other words, different cyclic shifts are set), thereby improving the reception performance of base station 100.

[0174] The amount of cyclic shift set in Variation 1 is merely an example, and other values ​​may be used.

[0175] [Variation 2] In the above embodiment, a case has been described in which terminal 200 repeatedly allocates one (in other words, one type) basic transmission unit in a plurality of frequency resources such as interlaces, for example, but the present invention is not limited to this.

[0176] For example, in variation 2, terminal 200 may repeatedly arrange multiple types of basic transmission units in multiple frequency resources. Terminal 200 may then apply patterns associated with, for example, different information bits to different basic transmission units. In other words, terminal 200 applies patterns associated with different information bits to different basic transmission units arranged for each of multiple groups obtained by dividing multiple frequency resources.

[0177] For example, in the case of N frequency resources, the terminal 200 may divide the N frequency resources into frequency resources (in other words, groups) for transmitting multiple basic transmission units. For example, when the terminal 200 generates I basic transmission units, the terminal 200 may divide the i-th (i=0 to I-1) basic transmission unit into R i In this case, as shown in the following equation (5), i The sum of these is N.

number

[0178] FIG. 14 shows an operation example according to the second variation.

[0179] In the example shown in Fig. 14, N = 10, I = 2, and R1 = R2 = 5. For example, in Fig. 14, of the 10 RBs included in interlace #0, basic transmission unit #0 is placed in 5 RBs, and basic transmission unit #1 is placed in the remaining 5 RBs.

[0180] Also, as shown in Fig. 14, a different pattern is applied to each basic transmission unit. This operation allows terminal 200 to transmit multiple types of information bits using different patterns for multiple basic transmission units, thereby improving frequency utilization efficiency. For example, in the example shown in Fig. 9, two information bits are transmitted from terminal 200 to base station 100 by selecting one pattern in one interlace. In contrast, in the example shown in Fig. 14, four information bits are transmitted from terminal 200 to base station 100 by selecting two patterns in one interlace.

[0181] Also, as shown in FIG. 14, the elements included in the pattern applied to each basic transmission unit may be divided into patterns including elements to be applied to each of the basic transmission units, for example, elements (for example, elements included in the pattern shown in FIG. 9) corresponding to a plurality of frequency resources (10 RBs in FIG. 14). For example, in FIG. 14, the pattern including 10 elements (cyclic shift amounts) may be divided into a pattern including the first five elements (a pattern applied to basic transmission unit #0) and a pattern including the latter five elements (a pattern applied to basic transmission unit #1). In other words, the combinations of elements corresponding to the 10 RBs included in one interlace are the same in FIG. 9 and FIG. 14.

[0182] As described above, the set of patterns shown in Fig. 9 is designed depending on low PAPR / CM and improved reception performance of base station 100. Therefore, the pattern design shown in Fig. 14 also provides low PAPR / CM characteristics and improved reception performance.

[0183] In addition, in FIG. 14, as an example, a case has been described in which the number of frequency resources (e.g., the number of RBs) to which multiple basic transmission units are respectively allocated is the same (e.g., 5 RBs), but the number of frequency resources to which each basic transmission unit is allocated may differ between the basic transmission units.

[0184] In addition, in FIG. 14, as an example, a case has been described in which each basic transmission unit is placed in 5 adjacent RBs among the multiple frequency resources included in an interlace, but this is not limited thereto. For example, each basic transmission unit may be placed in distributed frequency resources among the multiple frequency resources included in an interlace.

[0185] Further, in FIG. 14, the case where there are two basic transmission units has been described, but the number of basic transmission units is not limited to two and may be any number from three to N.

[0186] In addition, in Figure 14, as an example, a case has been described in which a pattern obtained by dividing the pattern shown in Figure 9 for each basic transmission unit is applied, but the pattern applied for each basic transmission unit is not limited to this and may be generated based on the size of each basic transmission unit.

[0187] Also, although a pattern including a cyclic shift amount as an element has been described here, variation 2 can be similarly applied to a pattern including, for example, a phase rotation and a sequence number as an element. Also, for example, the types of elements included in the patterns applied to a plurality of basic transmission units may be different. For example, in FIG. 14, the pattern applied to basic transmission unit #0 may include a cyclic shift amount, and the pattern applied to basic transmission unit #1 may include a sequence number.

[0188] An embodiment of the present disclosure has been described above.

[0189] (Other embodiments) In the above embodiment, the interlaced arrangement has been described as an example of resource arrangement in the frequency domain. However, resource arrangement in the frequency domain is not limited to the interlaced arrangement.

[0190] In the above-mentioned embodiment, the method of determining the element sequence consisting of the cyclic shift amount or sequence number in the pattern is not limited to the above-mentioned example of the element sequence (for example, FIG. 9 or FIG. 11). For example, the element sequence of the cyclic shift amount or sequence number included in the pattern may be generated by a pseudo-random sequence so as to be used in inter-symbol hopping of the cyclic shift used in LTE or NR or inter-slot hopping of the sequence number.

[0191] In addition, in the above embodiment, uplink communication in which a signal is transmitted from a terminal to a base station is assumed. However, an embodiment of the present disclosure is not limited to this, and may be applied to downlink communication in which a signal is transmitted from a base station to a terminal, or communication between terminals (e.g., sidelink communication).

[0192] Furthermore, the downlink control channel, the downlink data channel, the uplink control channel, and the uplink data channel are not limited to the PDCCH, the PDSCH, the PUCCH, and the PUSCH, respectively, and may be control channels with other names.

[0193] Furthermore, the unit of time resource is not limited to the time resource (for example, slot or subslot) described in each of the above embodiments, but may be another time resource unit (for example, subframe or frame, etc.).

[0194] The present disclosure can be realized by software, hardware, or software linked to hardware. Each functional block used in the description of the above embodiment may be realized partially or entirely as an LSI, which is an integrated circuit, and each process described in the above embodiment may be controlled partially or entirely by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip to include some or all of the functional blocks. The LSI may have input and output data. Depending on the degree of integration, the LSI may be called an IC, a system LSI, a super LSI, or an ultra LSI. The method of integration is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. In addition, a field programmable gate array (FPGA) that can be programmed after LSI manufacture, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if a new integrated circuit technology that can replace LSI appears due to the progress of semiconductor technology or a derivative technology, it is possible to integrate the functional blocks using that technology. The application of biotechnology is also a possibility.

[0195] The present disclosure may be implemented in any type of apparatus, device, or system having a communication function (collectively referred to as a communication apparatus). The communication apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both as functions. The radio transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices, etc.), game consoles, digital book readers, telehealth and telemedicine devices, communication-enabled vehicles or mobile conveyances (e.g., cars, airplanes, boats, etc.), and combinations of the above devices.

[0196] Communications Equipment includes, but is not limited to portable or mobile equipment, non-portable or fixed equipment, devices and systems of any kind, such as smart home devices (appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines and any other "Things" that may exist on an Internet of Things (IoT) network.

[0197] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0198] A communications apparatus also includes devices, such as controllers and sensors, connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0199] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0200] A terminal according to one embodiment of the present disclosure includes a control circuit that applies a pattern of coefficients associated with second information to first information allocated to a plurality of frequency resources, and a transmission circuit that transmits the first information to which the pattern has been applied.

[0201] In one embodiment of the present disclosure, the pattern includes elements whose number corresponds to the number of the frequency resources.

[0202] In one embodiment of the present disclosure, the element is any one of a cyclic shift amount, a phase rotation amount, and a sequence number of a code sequence.

[0203] In one embodiment of the present disclosure, the elements included in the pattern are of different values.

[0204] In one embodiment of the present disclosure, in each of the plurality of frequency resources, the elements among the plurality of patterns have different values.

[0205] In one embodiment of the present disclosure, the plurality of patterns are generated based on a common rule among the second information associated with each of the plurality of patterns.

[0206] In one embodiment of the present disclosure, the control circuit applies the pattern associated with each of the different second information to different first information arranged for each of a plurality of groups into which the plurality of frequency resources are divided.

[0207] In one embodiment of the present disclosure, the format of the first information is either PUCCH format 0 or PUCCH format 1.

[0208] In one embodiment of the present disclosure, the second information is a scheduling request.

[0209] In one embodiment of the present disclosure, the plurality of frequency resources are resources included in an interlace.

[0210] A base station according to one embodiment of the present disclosure includes a receiving circuit for receiving first information that is allocated to a plurality of frequency resources, and a control circuit for detecting second information that corresponds to a pattern of coefficients applied to the first information.

[0211] In a transmission method according to one embodiment of the present disclosure, a terminal applies a pattern of coefficients associated with second information to first information allocated to a plurality of frequency resources, and transmits the first information to which the pattern has been applied.

[0212] In a receiving method according to one embodiment of the present disclosure, a base station receives first information that is allocated to a plurality of frequency resources, and detects second information that corresponds to a pattern of coefficients applied to the first information.

[0213] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2019-148879, filed on August 14, 2019, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0214] An embodiment of the present disclosure is useful in a mobile communication system. [Explanation of symbols]

[0215] 100 base stations 101,205 Control section 102 Upper control signal generation unit 103 Downlink control information generator 104,206 Encoding section 105,207 Modulation section 106,208 Signal Allocation Section 107,209 Transmitter 108,201 Receiver 109,202 Extraction part 110,203 Demodulation section 111,204 Decoding section 200 terminals

Claims

1. A control circuit that applies a coefficient pattern including a plurality of coefficients to a first signal that is arranged in a plurality of resource blocks (RBs), each of which has an index; The coefficients correspond to the RBs, respectively; the first signal includes first information; the coefficient pattern is associated with second information different from the first information; a transmission circuit for transmitting the first signal to which the coefficient pattern has been applied; A terminal comprising:

2. The coefficient pattern includes the plurality of coefficients, the number of which corresponds to the plurality of RBs. The terminal according to claim 1.

3. The multiple coefficients are any one of a cyclic shift amount, a phase rotation amount, and a sequence number of a code sequence. The terminal according to claim 2.

4. At least some of the coefficients included in the coefficient pattern have values ​​different from each other. The terminal according to claim 2.

5. At least one of the plurality of coefficients has a value that differs among the plurality of candidates of the coefficient pattern. The terminal according to claim 2.

6. the plurality of coefficients are determined based on a common rule among the plurality of candidates of the coefficient pattern. The terminal according to claim 1.

7. The control circuit applies a plurality of the coefficient patterns respectively associated with different pieces of the second information to different first signals respectively arranged in a plurality of groups obtained by dividing the plurality of RBs. The terminal according to claim 1.

8. The format of the first signal is either PUCCH format 0 or PUCCH format 1. The terminal according to claim 1.

9. the second information being a scheduling request. The terminal according to claim 8.

10. The plurality of RBs are resources included in an interlace. The terminal according to claim 1.

11. The control circuit selects the coefficient pattern from a plurality of candidates of the coefficient pattern based on the second information. The terminal according to claim 1.

12. a receiving circuit for receiving a first signal that is arranged on a plurality of resource blocks (RBs), each of which has an index; the first signal includes first information, and a coefficient pattern including a plurality of coefficients is applied to the first signal, the plurality of coefficients corresponding to the plurality of RBs, respectively; a control circuit for detecting second information associated with the coefficient pattern applied to the first signal; Equipped with the second information is different from the first information; Base station.

13. The terminal is applying a coefficient pattern including a plurality of coefficients to a first signal arranged on a plurality of resource blocks (RBs), each having an index; The coefficients correspond to the RBs, respectively; the first signal includes first information; the coefficient pattern is associated with second information different from the first information; Transmitting the first signal to which the coefficient pattern has been applied. Transmission method.

14. The base station is receiving a first signal arranged on a plurality of resource blocks (RBs), each having an index; the first signal includes first information, and a coefficient pattern including a plurality of coefficients is applied to the first signal, the plurality of coefficients corresponding to the plurality of RBs, respectively; Detecting second information associated with the coefficient pattern applied to the first signal; the second information is different from the first information; Receiving method.

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