Terminal device, transmission method, and integrated circuit

Abstract

To dynamically change a repetition transmission method in an appropriate manner.SOLUTION: In a base station 100, a repetition control unit 103 determines a repetition pattern of data for a terminal 200. A transmission unit 109 repetitively transmits (repetitive transmission) the data based on the repetition pattern. Here, the repetition pattern of the data is associated with control information that is notified to the terminal 200 by dynamic signaling.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a transmission device, a reception device, a transmission method, and a reception method.

Background Art

[0002] In the standardization of 5G, a new radio access technology (NR: New Radio) that is not necessarily backward compatible with LTE / LTE-Advanced is being discussed in 3GPP.

[0003] In NR, technical studies targeting URLLC (Ultra-Reliable and Low Latency Communications), which is one of the requirements of 5G, are underway. URLLC is required to simultaneously satisfy "high reliability" with a packet transmission error rate of 32 bytes of packet data volume (packet transmission success rate of 99.999% or more) and "low latency" of 1 ms or less in the radio section (see, for example, Non-Patent Document 1). -5 In order to satisfy the above-described requirements of URLLC, it has been studied to repeatedly transmit (repetition transmission) packet data generated in a predetermined time unit (for example, 0.5 ms slot unit (subcarrier spacing = 30 kHz) or 0.25 ms slot unit (subcarrier spacing = 60 kHz)) (see, for example, Non-Patent Document 2). The receiving side can reduce the packet transmission error rate by synthesizing the repeated signals. Also, the transmitting side can reduce the delay by repeatedly transmitting the packet data without waiting for feedback information including retransmission control information from the receiving side. Note that repetition transmission can be applied to both the uplink data channel (PUSCH: Physical Uplink Shared Channel) and the downlink data channel (PDSCH: Physical Downlink Shared Channel).

[0004]

[0005] ​In Non-Patent Document 2, as shown in FIGS. 1(a) and 1(b), different repetition transmission methods targeting URLLC have been studied. Also, Non-Patent Document 2 describes that the optimal repetition transmission method dynamically changes depending on the wireless channel status or traffic volume of each terminal, etc.

[0006] For example, the repetition transmission method shown in FIG. 1(a) is a repetition transmission method suitable when the delay buffer budget (the remaining time from the first packet transmission time (e.g., timing #n) to the required packet delay budget timing) is small. Specifically, in FIG. 1(a), packets are repeatedly transmitted in continuous time (timings #n, #(n + 1)). By performing repetition transmission without an unsent interval (gap interval) in this way, the delay can be reduced. On the other hand, on the transmission side, since the reception status cannot be fully considered, there may be a case where excessive radio resource allocation is performed for the repetition data, and the utilization efficiency of radio resources may decrease.

[0007] The repetition transmission method shown in FIG. 1(b) is a repetition transmission method suitable when the delay buffer budget is large. In FIG. 1(b), packets are repeatedly transmitted in discontinuous time (timings #n, #(n + 2)) including a gap interval. The transmission side can perform efficient radio resource allocation for the second and subsequent repetition data by receiving feedback information from the reception side in the gap interval. For example, when the packet decoding is OK (no error), the reception side can use the feedback information to instruct the stop of subsequent repetition transmissions. Also, when the packet decoding is NG (there is an error), the reception side can use the feedback information to instruct the frequency resource allocation required for the packet decoding to be OK for subsequent repetition transmissions.

Prior Art Documents

Non-Patent Documents

[0008]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The buffer budget of each of the above-described terminals varies temporally depending on the packet scheduling timing. Therefore, it is necessary to consider a method of dynamically changing the repetition transmission method applied to each terminal.

[0010] One aspect of the present disclosure contributes to providing a transmission device, a reception device, a transmission method, and a reception method that can appropriately and dynamically change a repetition transmission method.

MEANS FOR SOLVING THE PROBLEM

[0011] A transmission device according to one aspect of the present disclosure includes a determination circuit that determines a repetition pattern of data for a terminal, and a transmission circuit that repeatedly transmits the data based on the repetition pattern, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0012] A receiving apparatus according to one aspect of the present disclosure includes a determination circuit that determines a repetition pattern of data for a terminal, a receiving circuit that receives the repeatedly transmitted data based on the repetition pattern, and a decoding circuit that synthesizes the repeatedly transmitted data, wherein the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0013] A transmission method according to one aspect of the present disclosure determines a repetition pattern of data for a terminal, repeatedly transmits the data based on the repetition pattern, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0014] A receiving method according to one aspect of the present disclosure determines a repetition pattern of data for a terminal, receives the repeatedly transmitted data based on the repetition pattern, synthesizes the repeatedly transmitted data, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0015] These general or specific aspects may be implemented in a system, apparatus, method, integrated circuit, computer program, or recording medium, or may be implemented in any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

Advantages of the Invention

[0016] According to one aspect of the present disclosure, the repetition transmission method can be appropriately and dynamically changed.

[0017] Further advantages and effects in one aspect of the present disclosure will be clarified from the specification and drawings. Such advantages and / or effects are provided by some embodiments and the features described in the specification and drawings respectively, but it is not necessarily required that all of them are provided to obtain one or more identical features.

Brief Description of the Drawings

[0018]

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Embodiments for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0020] Allocation information of the data channel (radio resource allocation information, MCS (Modulation and Coding Scheme), etc.) determined by the base station (referred to as eNB or gNB) according to the radio channel status of the terminal (referred to as UE: User Equipment) is included in the control information (DCI: Downlink Control Information) and notified from the base station to the terminal using the PDCCH (Physical Downlink Control Channel). Similarly, regarding the repetition transmission method (number of repetitions, or repetition pattern such as gap interval) applied by the base station to the terminal, it is considered to be transmitted from the base station to the terminal using the PDCCH included in the DCI.

[0021] On the other hand, especially for PDCCH for URLLC (also called NR-PDCCH), in order to control URLLC packets that require high reliability, an even lower error rate is required. To reduce the transmission error rate of NR-PDCCH, it is necessary to make the DCI format size notified by NR-PDCCH smaller.

[0022] Therefore, it is necessary to notify an appropriate repetition pattern (repetition transmission method) according to the wireless channel status of the terminal with a small amount of control information.

[0023] Therefore, in one aspect of the present disclosure, a method for dynamically notifying a repetition pattern according to the wireless channel status of a terminal while suppressing an increase in the amount of control information will be described.

[0024] [Overview of Communication System] A communication system according to an embodiment of the present disclosure includes a base station 100 and a terminal 200 that transmit and receive repetition data using a downlink data channel (PDSCH), and / or a base station 300 and a terminal 400 that transmit and receive repetition data using an uplink data channel (PUSCH). Note that one base station may have the configurations of both the base station 100 and the base station 300, or may have either one of the configurations. Similarly, one terminal may have the configurations of both the terminal 200 and the terminal 400, or may have either one of the configurations.

[0025] FIG. 2 is a block diagram showing a partial configuration of the base station 100 (that is, a transmission device) when using a downlink data channel (PDSCH) according to an embodiment of the present disclosure. In the base station 100 shown in FIG. 2, the repetition control unit 103 determines a repetition pattern of data for the terminal 200 (reception device), and the transmission unit 109 repeatedly transmits the data based on the repetition pattern.

[0026] FIG. 3 is a block diagram showing a partial configuration of a terminal 200 (i.e., a receiving device) when using a downlink data channel (PDSCH) according to an embodiment of the present disclosure. In the terminal 200 shown in FIG. 3, a repetition control unit 205 determines a repetition pattern of data for the terminal 200, a signal extraction unit 203 receives (extracts) the repeatedly transmitted data based on the repetition pattern, and a data combining and decoding unit 207 combines the repeatedly transmitted data.

[0027] In FIGS. 2 and 3, the repetition pattern of data is associated with control information notified to the terminal 200 by dynamic signaling (DCI).

[0028] FIG. 4 is a block diagram showing a partial configuration of a base station 300 (i.e., a receiving device) when using an uplink data channel (PUSCH) according to an embodiment of the present disclosure. In the base station 300 shown in FIG. 4, a repetition control unit 303 determines a repetition pattern of data for a terminal 400 (a transmitting device), a signal extraction unit 309 receives (extracts) the repeatedly transmitted data based on the repetition pattern, and a data combining and decoding unit 311 combines the repeatedly transmitted data.

[0029] FIG. 5 is a block diagram showing a partial configuration of a terminal 400 (i.e., a transmitting device) when using an uplink data channel (PUSCH) according to an embodiment of the present disclosure. In the terminal 400 shown in FIG. 5, a repetition control unit 405 determines a repetition pattern of data for the terminal 400, and a transmission unit 410 repeatedly transmits data based on the repetition pattern.

[0030] In FIGS. 4 and 5, the repetition pattern of data is associated with control information notified to the terminal 400 by dynamic signaling (DCI).

[0031] [Configuration of Base Station 100] FIG. 6 is a block diagram showing a configuration example of a base station 100 when using a downlink data channel (PDSCH) according to the present embodiment.

[0032] The base station 100 shown in FIG. 6 includes a scheduling unit 101, a control signal generation unit 102, a repetition control unit 103, a control signal encoding / modulation unit 104, a data encoding unit 105, a retransmission control unit 106, a data modulation unit 107, a radio resource allocation unit 108, a transmission unit 109, an antenna 110, a reception unit 111, a signal extraction unit 112, and a demodulation / decoding unit 113.

[0033] The scheduling unit 101 determines radio resource allocation information (frequency resource allocation information, time resource allocation information, terminal ID, data demodulation reference signal information, modulation / coding method, etc.) for a control signal (also called PDCCH, NR-PDCCH, DL assignment) for the terminal 200 and a downlink data channel (also called PDSCH) in a predetermined packet transmission time unit (TTI, slot, mini-slot, etc.; hereinafter referred to as "TU: Transmission Unit"). The scheduling unit 101 outputs the determined radio resource allocation information to the control signal generation unit 102, the data encoding unit 105, and the radio resource allocation unit 108.

[0034] The control signal generation unit 102 generates a control signal including control information (DCI) for scheduling the terminal 200. The control information includes radio resource allocation information for the downlink data channel (also called PDSCH) input from the scheduling unit 101. The control signal generation unit 102 generates a control signal using a control information bit string configured in a predetermined size format and outputs it to the repetition control unit 103 and the control signal encoding / modulation unit 104.

[0035] The repetition control unit 103 determines a repetition pattern (repetition pattern) of radio resource allocation for data signals per TU for the terminal 200 based on a predetermined rule using the control information (DCI) included in the control signal input from the control signal generation unit 102. The repetition control unit 103 outputs the determined repetition pattern to the radio resource allocation unit 108 and the retransmission control unit 106.

[0036] Here, the repetition pattern is the repetition pattern of radio resource allocation for each TU, and includes at least one of "number of repetitions in the time domain (number of TUs)", "number of repetitions in the frequency domain", "transmission interval or non-transmission time (number of TUs)", and "RV order per TU". Note that the number of repetitions in the frequency domain indicates, for example, the number of times to repeat the allocated frequency resources by adding a predetermined frequency offset (e.g., X [PRB: Physical Resource Block]). For example, if the frequency resource allocation determined in the scheduling unit 101 is PRB#n and the number of repetitions in the frequency domain determined in the repetition control unit 103 is 2, the base station 100 also allocates the data to be allocated to PRB#n to PRB#(X + n).

[0037] Note that the details of the method for determining the repetition pattern of radio resource allocation for the data signal per TU in the repetition control unit 103 will be described later.

[0038] The control signal encoding / modulation unit 104 modulates and encodes the bit sequence input from the control signal generation unit 102, and outputs the obtained symbol sequence to the radio resource allocation unit 108.

[0039] The data encoding unit 105 performs error correction encoding on the transmission data according to the encoding method input from the scheduling unit 101, and outputs the encoded data signal to the retransmission control unit 106.

[0040] Upon the first (new) transmission, the retransmission control unit 106 holds the encoded data signal input from the data encoding unit 105 and outputs it to the data modulation unit 107. Also, upon retransmission, the retransmission control unit 106 controls the held data based on the ACK / NACK result input from the demodulation / decoding unit 113. Specifically, when the retransmission control unit 106 receives a NACK, it outputs the corresponding held data to the data modulation unit 107. On the other hand, when the retransmission control unit 106 receives an ACK, it discards the corresponding held data and terminates the transmission of the downlink data.

[0041] Here, the retransmission control unit 106 outputs data of an RV (Redundancy Version: pattern of redundant bits for error correction) corresponding to the number of transmission TUs as the encoded data output to the data modulation unit 107 upon retransmission. For example, when using an RV pattern (RV order) in which the RV differs for each number of transmission TUs, at the receiving side (here, the terminal 200), the coding gain can be improved by synthesizing the data of multiple TUs, and the reception quality can be improved. Also, when using the same RV order for the RV for each number of transmission TUs, the transmission process can be simplified, so the delay time required for data transmission can be shortened. Note that the RV order applied to each terminal 200 or each cell may be determined by the base station 100 and notified to the terminal 200 by means such as upper layer notification, so that the base station 100 and the terminal 200 may be pre-recognized in agreement with each other.

[0042] The data modulation unit 107 modulates the data signal input from the retransmission control unit 106 with a predetermined modulation method input from the scheduling unit 101 and outputs the data modulation signal to the radio resource allocation unit 108.

[0043] The radio resource allocation unit 108 maps the signals respectively input as symbol sequences from the control signal encoding / modulating unit 104 and the data modulating unit 107 to the radio resources instructed by the scheduling unit 101 and the repetition control unit 103, and outputs the mapped signals to the transmission unit 109. Specifically, the radio resource allocation unit 108 allocates the radio resources of a plurality of TUs based on the radio resource allocation information within the TU (Transmission unit) input from the scheduling unit 101 and the repetition pattern of the radio resource allocation between TUs input from the repetition control unit 103 for the data signal.

[0044] The transmission unit 109 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and up-conversion on the signal input from the radio resource allocation unit 108, and transmits a radio signal to the terminal 200 via the antenna 110.

[0045] The receiving unit 111 performs RF processing such as down-conversion or A / D conversion on the uplink signal waveform transmitted from the terminal 200 received via the antenna 110, and outputs the received signal after the RF processing to the signal extraction unit 112.

[0046] The signal extraction unit 112 extracts the radio resource portion including the response signal for the downlink data from the received signal input from the receiving unit 111, and outputs it to the demodulation / decoding unit 113.

[0047] The demodulation / decoding unit 113 performs equalization, demodulation, and error correction decoding on the response signal input from the extraction unit 112, calculates the ACK / NACK information of the downlink data included in the response signal, and outputs it to the retransmission control unit 106.

[0048] [Configuration of Terminal 200] FIG. 7 is a block diagram showing a configuration example of the terminal 200 when using the downlink data channel (PDSCH) according to the present embodiment.

[0049] The terminal 200 shown in FIG. 7 includes an antenna 201, a receiving unit 202, a signal extraction unit 203, a control signal demodulation / decoding unit 204, a repetition control unit 205, a data demodulation unit 206, a data synthesis decoding unit 207, an error detection unit 208, a response signal generation unit 209, an encoding / modulation unit 210, a radio resource allocation unit 211, and a transmission unit 212.

[0050] The receiving unit 202 receives the control signal and the data signal transmitted from the base station 100 via the antenna 201, performs RF processing such as down-conversion or A / D conversion on the radio reception signal, and outputs the baseband reception signal after the RF processing to the signal extraction unit 203.

[0051] The signal extraction unit 203 extracts the signal portion including the control signal from the baseband reception signal input from the receiving unit 202 and outputs it to the control signal demodulation / decoding unit 204. Further, the signal extraction unit 203 extracts the signal portion including the downlink data channel from the baseband reception signal based on the radio resource allocation information within the TU input from the control signal demodulation / decoding unit 204 and the repetition pattern of the radio resource allocation between TUs input from the repetition control unit 205, and outputs it to the data demodulation unit 206.

[0052] When the control signal demodulation / decoding unit 204 blindly decodes the control signal input from the signal extraction unit 203 and determines that it is a control signal addressed to its own terminal, it outputs control information (DCI) including the radio resource allocation information within the TU of the downlink data channel to the signal extraction unit 203, the data demodulation unit 206, and the repetition control unit 205.

[0053] The repetition control unit 205 performs the same processing as the repetition control unit 103 provided in the base station 100. That is, the repetition control unit 205 uses the control information (DCI) input from the control signal demodulation / decoding unit 204 to determine the repetition pattern of the radio resource allocation for the data signal between TUs for the terminal 200 based on a predetermined rule. The repetition control unit 205 outputs the determined repetition pattern to the signal extraction unit 203 and the data synthesis decoding unit 207.

[0054] Based on the radio resource allocation information input from the control signal demodulation and decoding unit 204, the data demodulation unit 206 demodulates the downlink data channel input from the signal extraction unit 203 and outputs the demodulated downlink data channel to the data synthesis and decoding unit 207.

[0055] For the data input from the data demodulation unit 206, the data synthesis and decoding unit 207 synthesizes the repeated data among multiple TUs, decodes the synthesized data, and outputs the decoded downlink link data to the error detection unit 208. Here, when synthesizing the data, the data synthesis and decoding unit 207 can obtain coding gain by considering the RV order (pattern of RVs for each TU) input from the repetition control unit 205 for synthesis. Also, in the case of retransmitted data, the data synthesis and decoding unit 207 can improve the reception quality by synthesizing including the data at the previous transmission time.

[0056] The error detection unit 208 performs error detection on the data input from the data synthesis and decoding unit 207 by CRC, determines either ACK (no error) or NACK (error), and outputs the determination result to the response signal generation unit 209. Also, when there is no error in the data, the error detection unit 208 acquires the received data.

[0057] Based on the error detection result (ACK or NACK) input from the error detection unit 208, the response signal generation unit 209 generates a response signal (bit sequence) for the received downlink channel data and outputs it to the encoding and modulation unit 210.

[0058] The encoding and modulation unit 210 performs error correction encoding and modulation on the bit sequence input from the response signal generation unit 209 and outputs the symbol sequence to the radio resource allocation unit 211.

[0059] The radio resource allocation unit 211 maps the signal input as a symbol sequence from the encoding and modulation unit 210 to a predetermined radio resource and outputs the mapped signal to the transmission unit 212.

[0060] The transmission unit 212 performs RF processing such as D / A conversion and up-conversion on the signal input from the radio resource allocation unit 211, and transmits a radio signal to the base station 100 via the antenna 201.

[0061] [Configuration of Base Station 300] FIG. 8 is a block diagram showing a configuration example of the base station 300 when using the uplink data channel (PUSCH) according to the present embodiment.

[0062] The base station 300 shown in FIG. 8 includes a scheduling unit 301, a control signal generation unit 302, a repetition control unit 303, a control signal encoding / modulation unit 304, a radio resource allocation unit 305, a transmission unit 306, an antenna 307, a reception unit 308, a signal extraction unit 309, a data demodulation unit 310, a data synthesis and decoding unit 311, and an error detection unit 312.

[0063] The scheduling unit 301, the control signal generation unit 302, the repetition control unit 303, the control signal encoding / modulation unit 304, the transmission unit 306, and the reception unit 308 perform the same operations as the scheduling unit 101, the control signal generation unit 102, the repetition control unit 103, the control signal encoding / modulation unit 104, the transmission unit 109, and the reception unit 111 of the base station 100 shown in FIG. 6.

[0064] That is, the scheduling unit 301 determines radio resource allocation information within a predetermined TU of the control signal and the uplink data channel (also called PUSCH) for the terminal 400, and outputs the determined radio resource allocation information to the control signal generation unit 302, the signal extraction unit 309, and the data demodulation unit 310. Further, when the determination result of the previous transmission data input from the error detection unit 312 is NACK, the scheduling unit 301 preferentially schedules the retransmission data of the uplink data channel.

[0065] The control signal generation unit 302 generates control information (DCI) using a control information bit sequence configured in a format of a predetermined size with the radio resource allocation information input from the scheduling unit 301, and outputs it to the repetition control unit 303 and the control signal encoding / modulation unit 304.

[0066] The repetition control unit 303 determines a repetition pattern of radio resource allocation per TU for the terminal 400 based on a predetermined rule using the control information (DCI) input from the control signal generation unit 302. The repetition control unit 303 outputs the determined repetition pattern to the signal extraction unit 309 and the data synthesis and decoding unit 311.

[0067] The control signal encoding / modulation unit 304 modulates and encodes the bit sequence input from the control signal generation unit, and outputs the obtained symbol sequence to the radio resource allocation unit 305.

[0068] The radio resource allocation unit 305 maps the signal input as a symbol sequence from the control signal encoding / modulation unit 304 to a predetermined radio resource, and outputs the mapped signal to the transmission unit 306.

[0069] The transmission unit 306 performs RF processing such as D / A (Digital-to-Analog) conversion and up-conversion on the signal input from the radio resource allocation unit 305, and transmits a radio signal to the terminal 400 via the antenna 307.

[0070] The reception unit 308 performs RF processing such as down-conversion or A / D conversion on the uplink signal waveform transmitted from the terminal 400 and received via the antenna 307, and outputs the received signal after the RF processing to the signal extraction unit 309.

[0071] The signal extraction unit 309, data demodulation unit 310, data synthesis decoding unit 311, and error detection unit 312 perform the same operations as the signal extraction unit 203, data demodulation unit 206, data synthesis decoding unit 207, and error detection unit 208 of the terminal 200 shown in FIG. 7.

[0072] That is, based on the radio resource allocation information within the TU input from the scheduling unit 301 and the repetition pattern of radio resource allocation between TUs input from the repetition control unit 303, the signal extraction unit 309 extracts the signal portion including the uplink data channel from the baseband received signal and outputs it to the data demodulation unit 310.

[0073] Based on the radio resource allocation information input from the scheduling unit 301, the data demodulation unit 310 demodulates the uplink data channel input from the signal extraction unit 309 and outputs the demodulated uplink data channel to the data synthesis decoding unit 311.

[0074] For the data input from the data demodulation unit 310, the data synthesis decoding unit 311 synthesizes the repeated data between multiple TUs, decodes the synthesized data, and outputs the decoded downlink data to the error detection unit 312. Here, at the time of synthesis, the data synthesis decoding unit 311 can obtain a coding gain by synthesizing in consideration of the RV order (pattern of RV for each TU) input from the repetition control unit 303. Also, in the case of retransmitted data, the data synthesis decoding unit 311 can improve the reception quality by synthesizing including the data at the previous transmission.

[0075] The error detection unit 312 performs error detection by CRC on the data input from the data synthesis decoding unit 311, determines either ACK or NACK, and outputs the determination result to the scheduling unit 301. Also, when there is no error, the error detection unit 312 acquires the received data.

[0076] [Configuration of Terminal 400] FIG. 9 is a block diagram showing a configuration example of the terminal 400 when using the uplink data channel (PUSCH) according to the present embodiment.

[0077] The terminal 400 shown in FIG. 9 includes an antenna 401, a receiving unit 402, a signal extraction unit 403, a control signal demodulation / decoding unit 404, a repetition control unit 405, a data encoding unit 406, a retransmission control unit 407, a data modulation unit 408, a radio resource allocation unit 409, and a transmission unit 410.

[0078] Note that the receiving unit 402, the signal extraction unit 403, the control signal demodulation / decoding unit 404, and the repetition control unit 405 perform the same operations as the receiving unit 202, the signal extraction unit 203, the control signal demodulation / decoding unit 204, and the repetition control unit 205 of the terminal 200 shown in FIG. 7.

[0079] That is, the receiving unit 402 receives the control signal and the data signal transmitted from the base station 300 via the antenna 401, performs RF processing such as down-conversion or A / D conversion on the radio reception signal, and outputs the baseband reception signal after the RF processing to the signal extraction unit 403.

[0080] The signal extraction unit 403 extracts the signal portion including the control signal from the baseband reception signal input from the receiving unit 402, and outputs it to the control signal demodulation / decoding unit 404.

[0081] When the control signal demodulation / decoding unit 404 blindly decodes the control signal input from the signal extraction unit 403 and determines that it is a control signal addressed to its own terminal, it outputs control information (DCI) including radio resource allocation information within the TU of the uplink data channel to the data encoding unit 406, the data modulation unit 408, the repetition control unit 405, and the radio resource allocation unit 409.

[0082] The repetition control unit 405 uses the control information (DCI) input from the control signal demodulation / decoding unit 404 to determine a repetition pattern of radio resource allocation for data signals between TUs for the terminal 400 based on a predetermined rule. The repetition control unit 405 outputs the determined repetition pattern to the retransmission control unit 407 and the radio resource allocation unit 409.

[0083] The data encoding unit 406, retransmission control unit 407, data modulation unit 408, radio resource allocation unit 409, and transmission unit 410 perform the same operations as the data encoding unit 105, retransmission control unit 106, data modulation unit 107, radio resource allocation unit 108, and transmission unit 109 of the base station 100 shown in FIG. 6.

[0084] That is, the data encoding unit 406 performs error correction encoding on the transmission data according to the encoding method included in the control information (DCI) input from the control signal demodulation / decoding unit 404, and outputs the encoded data signal to the retransmission control unit 407.

[0085] At the time of the first (new) transmission, the retransmission control unit 407 holds the encoded data signal input from the data encoding unit 406 and outputs it to the data modulation unit 408. Also, at the time of retransmission, the retransmission control unit 407 outputs the data held at the time of the first transmission to the data modulation unit 408. Here, the retransmission control unit 407 outputs the data of the RV corresponding to the number of transmission TUs as the encoded data output to the data modulation unit 408 at the time of retransmission.

[0086] The data modulation unit 408 modulates the data signal input from the retransmission control unit 407 by a predetermined modulation method indicated by the control information (DCI) from the control signal demodulation / decoding unit 404, and outputs the data modulation signal to the radio resource allocation unit 409.

[0087] The radio resource allocation unit 409 allocates the radio resources of a plurality of TUs based on the radio resource allocation information within the TU indicated by the control information (DCI) from the control signal demodulation / decoding unit 404 and the repetition pattern of the radio resource allocation between TUs indicated by the repetition control unit 405 for the signal input as a symbol sequence from the data modulation unit 408. The radio resource allocation unit 409 outputs the signal mapped to the radio resources to the transmission unit 410.

[0088] The transmitting unit 410 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and up-conversion on the signal input from the radio resource allocation unit 409, and transmits a radio signal to the base station 300 via the antenna 401.

[0089] [Operations of Base Station and Terminal] The operations of the base stations 100, 300 and the terminals 200, 400 having the above configuration will be described in detail.

[0090] FIG. 10 is a sequence diagram showing the operations of the base station 100 (FIG. 6) and the terminal 200 (FIG. 7) (operations when using the downlink data channel).

[0091] The base station 100 determines radio resource allocation information regarding the downlink resource for the terminal 200 and generates DCI (ST101). Then, the base station 100 determines the repetition pattern of data (downlink data channel) for the terminal 200 (that is, the repetition pattern of radio resources for data signals between TUs) based on the radio resource allocation information included in the DCI generated in ST101 (ST102).

[0092] Next, the base station 100 transmits the PDCCH including the DCI generated in ST101 to the terminal 200 (ST103). When the terminal 200 receives the PDCCH, it determines the repetition pattern of data for the terminal 200 (that is, the repetition pattern of radio resources for data signals between TUs) in the same manner as ST102 based on the radio resource allocation information indicated by the DCI included in the PDCCH (ST104).

[0093] Then, based on the radio resource allocation information determined in ST101 and the repetition pattern determined in ST102, the base station 100 repeatedly transmits data (PDSCH) (ST105). In ST105, when receiving the data (PDSCH) based on the radio resource allocation information acquired in ST103 and the repetition pattern determined in ST104, the terminal 200 combines and decodes the repeatedly transmitted data (ST106).

[0094] FIG. 11 is a sequence diagram showing the operations of the base station 300 (FIG. 8) and the terminal 400 (FIG. 9) (operations when using the uplink data channel).

[0095] The base station 300 determines radio resource allocation information regarding the uplink resource for the terminal 400 and generates DCI (ST201). Then, based on the radio resource allocation information included in the DCI generated in ST201, the base station 300 determines the repetition pattern of the data (uplink data channel) for the terminal 400 (i.e., the repetition pattern of the radio resources for the data signal between TUs) (ST202).

[0096] Next, the base station 300 transmits a PDCCH including the DCI generated in ST201 to the terminal 400 (ST203). When receiving the PDCCH, based on the radio resource allocation information indicated in the DCI included in the PDCCH, the terminal 400 determines the repetition pattern of the data for the terminal 400 (i.e., the repetition pattern of the radio resources for the data signal between TUs) in the same manner as in ST202 (ST204).

[0097] Then, based on the radio resource allocation information acquired in ST203 and the repetition pattern determined in ST204, the terminal 400 repeatedly transmits data (PUSCH) (ST205). In ST205, when receiving the data (PUSCH) based on the radio resource allocation information determined in ST201 and the repetition pattern determined in ST202, the base station 300 combines and decodes the repeatedly transmitted data (ST206).

[0098] In this way, the repetition pattern is notified in association with the control information (radio resource allocation information) notified to terminals 200 and 400 by the DCI.

[0099] [Repetition control method] Next, a method for determining the repetition pattern of radio resource allocation for data signals between TUs by the repetition control units 103, 205, 303, and 405 in base stations 100 and 300 and terminals 200 and 400 will be described in more detail.

[0100] [Control information notified by DCI] In the following description, as an example, base stations 100 and 300 and terminals 200 and 400 determine the repetition pattern of radio resource allocation for data signals between TUs based on the control information explicitly or implicitly notified by the following DCI. (1) Frequency allocation bandwidth per TU (2) Number of transmission symbols per TU (3) Subcarrier spacing (SCS) (4) Uplink channel type (either SUL (Supplementary uplink) or Non - SUL)

[0101] In NR, the frequency allocation bandwidth per TU (specifically, Frequency domain resource assignment), the number of transmission symbols per TU (specifically, Time domain resource assignment), and the uplink channel type (specifically, UL / SUL indicator) are parameters explicitly notified by the DCI (see, for example, Non - Patent Document 3).

[0102] On the one hand, the subcarrier spacing (SCS) is a parameter set from the bandwidth part indicator (BWP allocation information) included in the DCI. The SCS used for data is preset for each BWP. Therefore, terminals 200 and 400 can implicitly grasp the SCS to be used based on the BWP indicated by the DCI. That is to say, it can be said that the SCS is a parameter implicitly notified by the DCI.

[0103] Thus, the frequency allocation bandwidth per TU, the number of transmission symbols per TU, the SCS, and the uplink channel type are all parameters explicitly or implicitly notified to terminals 200 and 400 by the DCI. That is, terminals 200 and 400 can dynamically change the repetition pattern associated with these parameters by receiving the DCI.

[0104] <Repetition pattern> In the following description, as an example, the repetition pattern determined in the repetition control units 103, 205, 303, and 405 includes any of the following information. (1) The number of repetitions of time resources (2) The number of repetitions of frequency resources (including a predetermined frequency interval and the number of repetitions) (3) Transmission time interval or non-transmission interval (4) RV order (RV pattern for each transmission TU)

[0105] Here, with reference to FIGS. 12A and 12B, the number of repetitions of time resources, the transmission time interval, or the non-transmission interval will be described.

[0106] As shown in FIGS. 12A and 12B, the number of repetitions of the time resource indicates the number of repetitions in TU units. Also, the transmission time interval or the non-transmission interval similarly indicates the time in TU units. FIG. 12A shows an example where the number of repetitions of the time resource = 4 [TU] and the transmission time interval = 0 [TU]. Further, FIG. 12B shows an example where the number of repetitions of the time resource = 4 [TU] and the transmission time interval = 1 [TU]. Since there is a non-transmission interval in FIG. 12B while there is no non-transmission interval in FIG. 12A, FIG. 12A can reduce the delay as compared with FIG. 12B. On the other hand, in FIG. 12B, by obtaining feedback information from the receiving side in the non-transmission interval, the radio resources for subsequent data transmission can be efficiently allocated.

[0107] Next, the number of repetitions of the frequency resource will be described with reference to FIG. 13.

[0108] In FIG. 13, when the frequency allocation bands per TU allocated by DCI are PRB#1 to PRB#3, data allocation is repeated in the frequency resources PRB#(X + 1) to PRB#(X + 3) with a predetermined frequency offset (X [PRB] in FIG. 13). When the number of repetitions in the frequency domain increases, data allocation is further repeated in the frequency resources PRB#(2X + 1) to PRB#(2X + 3) with the frequency offset added. On the receiving side, a frequency diversity gain can be obtained by synthesizing the data in the bands repeatedly allocated in this way.

[0109] Next, the RV order will be described.

[0110] The RV order indicates the RV pattern applied to the transmission order of a predetermined number of TUs. For example, if there are RV patterns from 0 to 3 and the RV order for up to 4 transmitted TUs is defined, it is defined as {Tx1, Tx2, Tx3, Tx4} = {0, 0, 0, 0}, {0, 2, 3, 1}, etc. When using the RV order of {0, 0, 0, 0}, the same redundant bits are transmitted regardless of the number of transmissions, so the transmission and reception processing can be simplified and the delay can be reduced, but the coding gain after synthesis is small. On the other hand, when using the RV order of {0, 2, 3, 1}, different redundant bits are transmitted according to the number of transmissions, so the coding gain after synthesis can be improved, but the transmission and reception processing becomes complicated and the delay may increase.

[0111] Note that the RV order is not limited to {0, 0, 0, 0}, {0, 2, 3, 1}, and other patterns may also be used.

[0112] <Method for Determining Repetition Pattern> Next, a specific example of the method for determining the repetition pattern will be described.

[0113] (Specific Example 1: Based on Frequency Allocation Bandwidth) In Specific Example 1, the repetition pattern is determined according to the frequency allocation bandwidth per TU.

[0114] If the packet size (Payload size) is the same, it is assumed that the narrower the frequency allocation bandwidth, the higher the coding rate and the lower the reception quality. Therefore, in Specific Example 1, the more narrow the frequency allocation bandwidth, the more the number of repetitions of the time resource (or frequency resource).

[0115] For example, as shown in FIG. 14, when the frequency allocation bandwidth (number of PRBs) per TU is greater than a predetermined bandwidth (X [PRB]), the number of repetitions is set to 2. On the other hand, when the frequency allocation bandwidth per TU is less than or equal to the predetermined bandwidth (X [PRB]), the number of repetitions is set to 4. That is, when the frequency allocation bandwidth per TU is less than the predetermined bandwidth X, in order to improve the reception quality by the combined gain due to repetition, a larger number of repetitions (4) than the number of repetitions (2) when the frequency allocation bandwidth per TU is greater than the predetermined bandwidth X is set.

[0116] Thereby, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the frequency allocation bandwidth set for the terminals 200 and 400, and can prevent the deterioration of the reception quality.

[0117] Also, the repetition pattern is uniquely derived based on the frequency allocation bandwidth included in the DCI. That is, the repetition pattern is implicitly notified to the terminals 200 and 400 by the notification of the frequency allocation bandwidth. Thereby, since an explicit notification for the repetition pattern becomes unnecessary, an increase in the DCI size can be prevented.

[0118] Note that the correspondence relationship between the frequency allocation bandwidth and the repetition pattern (number of repetitions) shown in FIG. 14 is an example and is not limited thereto. For example, the predetermined threshold value (X in FIG. 14) is not limited to one, and a plurality of them may be set. The number of repetitions may be set to a larger value as the frequency allocation bandwidth is narrower. Also, the number of repetitions is not limited to 2 or 4, and other values may be used.

[0119] (Specific Example 2: Based on the number of transmission symbols) In Specific Example 2, the repetition pattern is determined according to the number of transmission symbols per TU.

[0120] Similar to Specific Example 1, if the packet size (Payload size) is the same, it is assumed that the coding rate increases and the received quality decreases as the number of transmission symbols decreases. Therefore, in Specific Example 2, as the number of transmission symbols decreases, the repetition count of time resources (or frequency resources) is increased.

[0121] For example, as shown in FIG. 15, when the number of transmission symbols per TU is greater than a predetermined number of symbols (X [symbol]), the repetition count is set to 2. On the other hand, when the number of transmission symbols per TU is less than or equal to the predetermined number of transmission symbols (X [symbol]), the repetition count is set to 4. That is, when the number of transmission symbols per TU is less than or equal to the predetermined symbol number X, in order to improve the received quality by the combined gain due to repetition, a repetition count (4) greater than the repetition count (2) when the number of transmission symbols per TU is greater than the predetermined symbol number is set.

[0122] Thereby, the repetition control units 103, 205, 303, 405 can dynamically set the repetition pattern according to the number of transmission symbols set in the terminals 200, 400, and can prevent deterioration of the received quality.

[0123] Also, the repetition pattern is uniquely derived based on the number of transmission symbols included in the DCI. That is, the repetition pattern is implicitly notified to the terminals 200, 400 by the notification of the number of transmission symbols. Thereby, an explicit notification for the repetition pattern becomes unnecessary, and an increase in the DCI size can be prevented.

[0124] Note that the correspondence relationship between the number of transmission symbols and the repetition pattern (repetition count) shown in FIG. 15 is an example and is not limited thereto. For example, the predetermined threshold value (X in FIG. 15) is not limited to one, and a plurality of them may be set. The repetition count may be set to a larger value as the number of transmission symbols decreases. Also, the repetition count is not limited to 2 or 4, and other values may be used.

[0125] (Specific Example 3: Sub - Carrier Spacing (SCS) based) In Specific Example 3, the repetition pattern is determined according to the SCS used for the data channel.

[0126] As shown in FIG. 16, the wider the SCS, the shorter the 1-symbol length (the shorter the TU length). Therefore, the wider the SCS, the more the number of repetitions or the transmission time interval can be increased without increasing the delay time.

[0127] Therefore, in Specific Example 3, for example, as shown in FIG. 17, the transmission intervals in the cases of SCS = 30 kHz and 60 kHz are made longer than the transmission interval in the case of SCS = 15 kHz. Specifically, the transmission intervals in the cases of SCS = 30 kHz and 60 kHz are set to 1 [TU], and the transmission interval in the case of SCS = 15 kHz is set to 0 [TU]. That is, as shown in FIG. 16, when SCS = 15 kHz, the data is transmitted in continuous TUs, and when SCS = 30 kHz or 60 kHz, the data is transmitted in non - continuous TUs with an empty non - transmission section (1 TU).

[0128] Thus, the transmitting side can obtain feedback information from the receiving side in the non - transmission section when SCS = 30 kHz or 60 kHz, and can perform subsequent transmissions efficiently.

[0129] Also, as shown in FIG. 17, the number of repetitions in the case of SCS = 60 kHz may be made larger than the number of repetitions in the cases of SCS = 15 kHz and 30 kHz. Specifically, the number of repetitions in the case of SCS = 60 kHz is set to 4 [TU], and the number of repetitions in the cases of SCS = 15 kHz and 30 kHz is set to 2 [TU]. Thereby, a larger combined gain can be obtained when SCS = 60 kHz.

[0130] Note that as shown in FIG. 16, the wider the SCS, the shorter the 1 - symbol length. Therefore, even if the transmission interval is made longer or the number of repetitions is made larger as the SCS gets wider, the delay time of the repeatedly transmitted data does not increase.

[0131] Also, the wider the SCS, the longer the transmission time interval (number of TUs) may be set. For example, as shown in FIG. 18, it may be defined that the wider the SCS, the longer the transmission time interval. As a result, as shown in FIG. 19, the wider the SCS (i.e., the shorter the 1 symbol length), the more untransmitted intervals can be secured, and the transmitting side can surely receive and process the feedback information from the receiving side. That is, appropriate timing for receiving the feedback information can be set for each SCS.

[0132] As a result, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the SCS set in the terminals 200 and 400, and can prevent deterioration of reception quality.

[0133] Also, the repetition pattern is uniquely derived based on the SCS implicitly calculated from the BWP information included in the DCI. That is, the repetition pattern is implicitly notified to the terminals 200 and 400 by the notification of the SCS based on the BWP information. As a result, an explicit notification for the repetition pattern becomes unnecessary, and an increase in the DCI size can be prevented.

[0134] Also, as another example, the RV order may be set according to the number of repetitions.

[0135] For example, as shown in FIG. 20, when SCS = 15 kHz or 30 kHz, the number of repetitions = 2 TUs is set, so the RV order = {0, 3} used for transmission for 2 TUs is set. On the other hand, when SCS = 60 kHz, the number of repetitions = 4 TUs is set, so the RV order = {0, 2, 3, 1} used for transmission for 4 TUs is set. That is, the number of RVs included in the RV order for each SCS is the same as the number of repetitions set for each SCS. As a result, the number of repetitions and the RV order according to the SCS can be set, and deterioration of reception quality can be prevented. Also, as described above, since the number of repetitions and the RV order are uniquely derived based on the SCS implicitly notified by the DCI, an increase in the DCI size can be prevented.

[0136] Also, even when the number of repetitions is constant regardless of the SCS, the RV order may be set according to the SCS used for the data channel.

[0137] For example, as shown in FIG. 21, the wider the SCS, the shorter the 1-symbol length, and thus the shorter the processing time until the next transmission. Therefore, for example, as shown in FIG. 22, the wider the SCS, the RV order with fewer changes in the RV pattern is set.

[0138] Specifically, at SCS = 15 kHz, the time per TU is long and there is a margin in the processing time. Therefore, an RV order = {0, 2, 3, 1} with different RV patterns for each TU is set. Thereby, coding gain can be obtained.

[0139] On the other hand, at SCS = 60 kHz, the time per TU is short and there is no margin in the processing time. Therefore, an RV order = {0, 0, 0, 0} (that is, an RV order with no change in the RV pattern) with the same RV pattern for each TU is set. Thereby, an increase in delay can be prevented.

[0140] Also, at SCS = 30 kHz, since the time per TU is shorter compared to SCS = 15 kHz, an RV order = {0, 3, 0, 3} with fewer changes in the RV pattern than the RV order in the case of SCS = 15 kHz is set. In other words, at SCS = 30 kHz, since the time per TU is longer compared to SCS = 60 kHz, an RV order = {0, 3, 0, 3} with larger changes in the RV pattern than the RV order in the case of SCS = 60 kHz is set.

[0141] As a result, an RV order corresponding to the SCS can be set, thereby preventing an increase in delay and deterioration of reception quality. Also, the RV order is uniquely derived based on the SCS implicitly calculated from the BWP information included in the DCI. That is, the RV order is implicitly notified to terminals 200 and 400 by the notification of the SCS. This eliminates the need for an explicit notification for the RV order, thus preventing an increase in the DCI size.

[0142] Note that the correspondence between the SCS and the repetition pattern (number of repetitions, transmission interval, RV order) shown in FIGS. 16 to 22 is merely an example and is not limited thereto. For example, the value of the SCS is not limited to 15 kHz, 30 kHz, and 60 kHz, and other values (for example, 120 kHz, 240 kHz) may be used. Also, the repetition pattern associated with the SCS may be at least one of the number of repetitions, the transmission time interval, and the RV order. Also, the values of the number of repetitions, the transmission interval, and the RV order are not limited to the values shown in FIGS. 16 to 22, and other values may be used. Also, for example, in FIGS. 17 and 18, the repetition pattern associated with the SCS may be either the number of repetitions or the transmission time interval.

[0143] (Specific Example 4: Uplink Channel Type Based) In Specific Example 4, the repetition pattern is set according to the uplink channel type, specifically, whether the assigned uplink channel is SUL or not.

[0144] In NR, it is stipulated that a terminal supporting LTE and NR uses the LTE frequency band as an auxiliary in NR uplink transmission. In this NR uplink transmission, the band assigned as an auxiliary is called "SUL (Supplementary uplink)".

[0145] It is assumed that the SUL using the LTE band has a lower carrier frequency than the Non-SUL using the NR band. The lower the carrier frequency, the smaller the path loss, so higher reception quality can be expected for the SUL than for the Non-SUL.

[0146] Therefore, in Specific Example 4, for example, as shown in FIG. 23, when the uplink channel type assigned to terminals 200 and 400 is SUL, the number of repetitions is set to 2, and when the uplink channel type assigned to terminals 200 and 400 is non-SUL, the number of repetitions is set to 4. That is, when the uplink channel type is non-SUL, in order to improve the reception quality by the combined gain due to repetition, a larger number of repetitions (4) than the number of repetitions (2) when the uplink channel type is SUL is set.

[0147] Thereby, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the uplink channel type set for terminals 200 and 400, and can prevent the deterioration of reception quality.

[0148] Also, the repetition pattern is uniquely derived based on the uplink channel type included in the DCI. That is, the repetition pattern is implicitly notified to terminals 200 and 400 by the notification of the uplink channel type. Thereby, an explicit notification for the repetition pattern becomes unnecessary, and an increase in the DCI size can be prevented.

[0149] Note that the correspondence relationship between the uplink channel type and the repetition pattern (number of repetitions) shown in FIG. 23 is an example and is not limited thereto. That is, the number of repetitions is not limited to 2 or 4, and other values may be used.

[0150] The above has described Specific Examples 1 to 4 respectively.

[0151] In this way, in the present embodiment, the repetition pattern is associated with control information that is explicitly or implicitly notified to terminals 200 and 400 by DCI (Dynamic Signaling). Thereby, base stations 100 and 300 can dynamically control the repetition pattern for terminals 200 and 400 by notifying DCI. That is, terminals 200 and 400 can dynamically change the repetition pattern for terminals 200 and 400 by the notification of DCI from base stations 100 and 300.

[0152] In addition, the repetition pattern is implicitly notified to terminals 200 and 400 by other parameters (for example, radio resource allocation information) other than the repetition pattern. Thereby, explicit signaling for notifying the repetition pattern becomes unnecessary during dynamic control of the repetition pattern.

[0153] As described above, according to the present embodiment, appropriately, the repetition transmission method can be dynamically changed, and the system performance can be improved.

[0154] The embodiments of the present disclosure have been described above.

[0155] (1) Note that the application of the present disclosure is not limited to URLLC. For example, one aspect of the present disclosure can also be applied to repetition transmission for the purpose of improving coverage performance in mMTC, and the same effects can be obtained.

[0156] (2) Also, in the above embodiment, the case where the repetition pattern of the radio resource allocation for the data signal between TUs is implicitly notified by DCI has been described, but the present invention is not limited to this. For example, DCI information used for instructing the repetition pattern may be added and combined with the example in the above embodiment. For example, as shown in FIG. 24, one-bit information for instructing the repetition pattern may be included in the DCI, and the number of repetitions may be determined. Specifically, in FIG. 24, candidates (1, 4) or (2, 8) of the repetition pattern (number of repetitions) are determined according to the frequency allocation bandwidth as in Specific Example 1 (FIG. 14), and the number of repetitions is determined according to the one-bit information included in the DCI from among the determined candidates.

[0157] As a result, although the DCI size slightly increases (by 1 bit), a more appropriate repetition pattern can be set according to the radio channel status of the terminal 200.

[0158] Note that FIG. 24 is an example, and the parameters for determining the repetition pattern in combination with the one-bit DCI information are not limited to the frequency allocation bandwidth, and may be other parameters (number of transmission symbols, SCS, uplink channel type). Also, the repetition pattern is not limited to the number of repetitions, and may be other values (transmission interval, RV order).

[0159] (3) Also, based on the parameters (control information) explicitly or implicitly notified by the DCI, candidates for the repetition pattern of the radio resource allocation for the data signal between TUs are determined, and the actually applied repetition pattern may be notified by the DCI information from among the candidates.

[0160] For example, as shown in FIG. 25, when the uplink channel type is SUL, the candidates for the repetition pattern (number of repetitions) are {1, 2, 4, 8}, and when it is Non-SUL, the candidates for the repetition pattern (number of repetitions) are {1, 4, 16, 32}. As described above, since Non-SUL is assumed to use a higher carrier frequency than SUL, a larger number of repetitions can be set than SUL.

[0161] In the case of FIG. 25, in order to notify the repetition pattern, by adding 2 bits to the DCI, the base stations 100 and 300 can dynamically select the optimal number of repetitions according to the radio channel conditions of the terminals 200 and 400 from the candidates. As a result, although the DCI size increases slightly (by 2 bits), an appropriate repetition pattern can be set according to the radio channel conditions of the terminals 200 and 400.

[0162] Note that FIG. 25 is an example, and the parameters associated with the repetition pattern candidates are not limited to the uplink channel type, and may be other parameters (frequency allocation bandwidth, number of transmission symbols, SCS). Also, the repetition pattern is not limited to the number of repetitions, and may be other values (transmission interval, RV order).

[0163] (4) The relationship between the control information explicitly or implicitly notified by the DCI and the repetition pattern of the radio resource allocation for the data signal between TUs described in the above embodiment (FIGS. 14, 15, 17, 18, 20, 22 - 25) may be set by the base stations 100 and 300 for each of the terminals 200 and 400 in the upper layer notification. Thereby, an appropriate repetition pattern can be set for each of the terminals 200 and 400. Also, the relationship between the above parameters and the repetition pattern may be defined for each cell or by the specification. Thereby, the overhead of the upper layer notification can be reduced.

[0164] (5) Also, the repetition pattern of the radio resource allocation for the data signal between TUs may be determined according to the type of data waveform used by the terminals 200 and 400. When the data waveform is DFT-S-OFDM, there is an advantage of low PAPR (Peak to Average Power Ratio), but there is a characteristic that the reception performance deteriorates compared with the case where the data waveform is OFDM. Therefore, by setting the number of repetitions in the case of DFT-S-OFDM to be larger than the number of repetitions in the case of OFDM, the deterioration of the reception quality in the case of DFT-S-OFDM can be prevented.

[0165] Also, according to the type of CP (Cyclic Prefix) used by terminals 200 and 400, the repetition pattern of radio resource allocation for data signals between TUs may be determined. A cell using ECP (Extended CP) is assumed to have a wider cell radius compared to a cell using NCP (Normal CP). Therefore, by setting the number of repetitions when the CP type is ECP to be larger than the number of repetitions when the CP type is NCP, deterioration of reception quality when using ECP can be prevented.

[0166] Note that the type of data waveform or CP type may be notified by DCI.

[0167] (6) The relationship between the control information (e.g., frequency allocation bandwidth per TU, number of transmission symbols per TU, SCS, uplink channel type) explicitly or implicitly notified by DCI, as shown in FIGS. 14, 15, 17, 18, 20, 22 - 25, and the repetition pattern of radio resource allocation for data signals between TUs (e.g., number of repetitions of time resources, number of repetitions of frequency resources, transmission time interval, RV order) is an example. Any combination of the correspondence relationships shown in FIGS. 14, 15, 17, 18, 20, 22 - 25 may be used.

[0168] (7) The present disclosure can be implemented by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiments is realized, partially or entirely, as an LSI which is an integrated circuit, and each process described in the above embodiments 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 so as to include a part or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may also be referred to as an IC, a system LSI, a super LSI, or an ultra LSI. The method of integrating into a circuit is not limited to LSI, and it may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, after manufacturing the LSI, an FPGA (Field Programmable Gate Array) that can be programmed, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if a circuit integration technology that replaces the LSI appears due to the progress of semiconductor technology or another derived technology, naturally, the integration of functional blocks may be performed using that technology. The application of biotechnology and the like are possible as examples.

[0169] The present disclosure can be implemented in any type of device, apparatus, system having a communication function (collectively referred to as a communication device). Non-limiting examples of the communication device include a telephone (mobile phone, smartphone, etc.), a tablet, a personal computer (PC) (laptop, desktop, notebook, etc.), a camera (digital still / video camera, etc.), a digital player (digital audio / video player, etc.), a wearable device (wearable camera, smartwatch, tracking device, etc.), a game console, a digital book reader, a telehealth / telemedicine (remote healthcare / medical prescription) device, a vehicle or mobile transportation means with a communication function (automobile, airplane, ship, etc.), and a combination of the above various devices.

[0170] The communication device is not limited to being portable or movable, and includes all kinds of devices, apparatuses, systems that are not portable or are fixed, such as smart home devices (home appliances, lighting devices, smart meters or measuring devices, control panels, etc.), vending machines, and any other "Things" that can exist on the IoT (Internet of Things) network.

[0171] Communication includes data communication by cellular systems, wireless LAN systems, communication satellite systems, etc., as well as data communication by combinations of these.

[0172] In addition, the communication device also includes devices such as controllers and sensors that are connected or linked to a communication device that executes the communication function described in the present disclosure. For example, controllers and sensors that generate control signals and data signals used by the communication device that executes the communication function of the communication device are included.

[0173] In addition, the communication device includes infrastructure facilities, such as base stations, access points, and any other devices, apparatuses, systems, that communicate with or control the above-mentioned various non-limited devices.

[0174] The transmission device of the present disclosure includes a determination circuit that determines a repetition pattern of data for a terminal, and a transmission circuit that repeatedly transmits the data based on the repetition pattern, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0175] In the transmission device of the present disclosure, the repetition pattern includes at least the number of repetitions of the data, and the smaller the number of resources allocated to the terminal, the larger the number of repetitions.

[0176] In the transmission device of the present disclosure, the smaller the bandwidth allocated to the terminal, the larger the number of repetitions.

[0177] In the transmission device of the present disclosure, the smaller the number of symbols allocated to the terminal, the larger the number of repetitions.

[0178] In the transmission device of the present disclosure, the repetition pattern includes at least the number of repetitions of the data, and the larger the subcarrier spacing set for the terminal, the larger the number of repetitions.

[0179] In the transmission device of the present disclosure, the repetition pattern further includes an RV order representing the transmission order of RVs, and the number of RVs included in the RV order at each subcarrier spacing is the same as the number of repetitions set for each subcarrier spacing.

[0180] In the transmission device of the present disclosure, the repetition pattern includes at least the transmission interval of the data to be repeatedly transmitted, and the larger the subcarrier spacing set for the terminal, the longer the transmission interval.

[0181] In the transmission device of the present disclosure, the repetition pattern includes at least an RV order representing the transmission order of RVs, and the larger the subcarrier spacing set for the terminal, the fewer the changes in the RV pattern in the RV order.

[0182] In the transmission device of the present disclosure, the repetition pattern includes at least the number of repetitions of the data, and the number of repetitions is larger when the uplink channel type set for the terminal is non-SUL than when the uplink channel type is SUL (Supplementary uplink).

[0183] The receiving apparatus of the present disclosure includes a determination circuit that determines a repetition pattern of data for a terminal, a receiving circuit that receives the repeatedly transmitted data based on the repetition pattern, and a decoding circuit that synthesizes the repeatedly transmitted data, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0184] The transmission method of the present disclosure determines a repetition pattern of data for a terminal, repeatedly transmits the data based on the repetition pattern, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

[0185] The receiving method of the present disclosure determines a repetition pattern of data for a terminal, receives the repeatedly transmitted data based on the repetition pattern, synthesizes the repeatedly transmitted data, and the repetition pattern is associated with control information notified to the terminal by dynamic signaling.

Industrial Applicability

[0186] The disclosures of the specification, drawings, and abstract included in Japanese Patent Application No. 2018-025857 filed on February 16, 2018 are all incorporated herein by reference.

[0187] One aspect of the present disclosure is useful for a mobile communication system.

Description of Symbols

[0188] 100, 300 Base station 200, 400 Terminal 101, 301 Scheduling unit 102, 302 Control signal generation unit 103, 205, 303, 405 Repetition control unit 104, 304 Control signal encoding / modulation unit 105, 406 Data encoding unit 106, 407 Retransmission control unit 107,408 Data Modulation Unit 108,211,305,409 Radio Resource Allocation Unit 109,212,306,410 Transmission Unit 110,201,307,401 Antenna 111,202,308,402 Reception Unit 112,203,309,403 Signal Extraction Unit 113 Demodulation and Decoding Unit 204,404 Control Signal Demodulation and Decoding Unit 206,310 Data Demodulation Unit 207,311 Data Synthesis and Decoding Unit 208,312 Error Detection Unit 209 Response Signal Generation Unit 210 Encoding and Modulation Unit

Claims

1. A receiving unit for receiving downlink control information; a circuit for determining a repetition pattern based on the fact that data is assigned to a Supplemental uplink (SUL) as indicated by the downlink control information; a transmitting unit that transmits the data in the determined repetition pattern; Equipped with Terminal device.

2. the repetition pattern includes at least the number of repetitions of the data, The smaller the number of resources per transmission unit allocated to the terminal device, the greater the number of repetitions. The terminal device according to claim 1 .

3. the repetition pattern includes at least the number of repetitions of the data, The smaller the bandwidth per allocated transmission unit, the higher the number of repetitions. The terminal device according to claim 1 .

4. the repetition pattern includes at least the number of repetitions of the data, The fewer the number of symbols per transmission unit allocated, the greater the number of repetitions. The terminal device according to claim 1 .

5. the repetition pattern includes at least the number of repetitions of the data, The wider the set subcarrier interval, the greater the number of repetitions. The terminal device according to claim 1 .

6. The repetition pattern further includes an RV order indicating a transmission order of the RV, The number of RVs included in the RV order in each subcarrier interval is equal to the number of repetitions set for each subcarrier interval. The terminal device according to claim 5.

7. the repetition pattern includes at least a transmission interval of the data that is repeatedly transmitted, The wider the set subcarrier interval, the longer the transmission interval. The terminal device according to claim 1 .

8. The repetition pattern includes at least an RV order that indicates a transmission order of the RV, The wider the subcarrier spacing, the less the RV pattern changes in the RV order. The terminal device according to claim 1 .

9. the repetition pattern includes at least the number of repetitions of the data, The number of repetitions is greater when the data is assigned to a non-SUL than when the data is assigned to a SUL. The terminal device according to claim 1 .

10. receiving downstream control information; determining a repetition pattern based on the fact that data is allocated to a Supplemental uplink (SUL) as indicated by the downlink control information; transmitting the data in the determined repetition pattern; Equipped with Transmission method.

11. A process of receiving downlink control information; determining a repetition pattern based on the fact that data is allocated to a Supplemental uplink (SUL) as indicated by the downlink control information; transmitting the data in the determined repetition pattern; Controlling Integrated circuits.

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