COMMUNICATION DEVICE, COMMUNICATION METHOD, AND INTEGRATED CIRCUIT

Abstract

To appropriately and dynamically change a repetition transmission method.SOLUTION: In a base station 100, a reputation controller 103 determines a data repetitive pattern (repetition pattern) for a terminal 200. A transmitter 109 repeats data transmission (repetition transmission) on the basis of the repetitive pattern. Here, the data repetitive pattern is associated with control information to be reported to the terminal 200 with dynamic signaling.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a transmitting device, a receiving device, a transmitting method, and a receiving method. [Background technology]

[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 at 3GPP.

[0003] In NR, technical studies are underway targeting URLLC (Ultra-Reliable and Low Latency Communications), one of the requirements for 5G. URLLC is a 32-byte packet data size that is 10 -5 It is required to simultaneously satisfy "high reliability" with a packet transmission error rate below 99.999% (packet transmission success rate of 99.999% or more) and "low latency" of 1 ms or less in the wireless section (for example, see Non-Patent Document 1).

[0004] In order to satisfy the above-mentioned requirements of URLLC, repeated transmission (repetition transmission) of 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)) is being considered (for example, see Non-Patent Document 2). The receiving side can reduce the packet transmission error rate by combining the repeated signals. Also, the transmitting side can reduce delay by repeatedly transmitting 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).

[0005] Non-Patent Document 2 considers different repetition transmission methods targeting URLLC, as shown in (a) and (b) of Figure 1. Non-Patent Document 2 also describes that the optimal repetition transmission method dynamically changes depending on the wireless channel conditions or traffic volume of each terminal.

[0006] For example, the repetition transmission method shown in FIG. 1(a) is suitable when the delay buffer budget (the remaining time from the first packet transmission (e.g., timing #n) to the requested packet delay budget timing) is small. Specifically, in FIG. 1(a), packets are repeatedly transmitted at continuous times (timings #n, #(n+1)). In this way, repetition transmission without non-transmitted sections (gap sections) can reduce delay. On the other hand, since the transmitting side cannot fully take into account the reception conditions, excessive radio resources may be allocated to the repetition data, which may reduce the efficiency of radio resource usage.

[0007] The repetition transmission method shown in FIG. 1(b) is suitable for the case where the buffer budget for delay is large. In FIG. 1(b), packets are repeatedly transmitted at non-continuous times (timings #n, #(n+2)) including the gap section. The transmitting side can efficiently allocate radio resources to the second and subsequent repetition data by receiving feedback information from the receiving side during the gap section. For example, if the packet decoding is OK (no error), the receiving side can use the feedback information to instruct the subsequent repetition transmission to stop. Also, if the packet decoding is NG (error), the receiving side can use the feedback information to instruct the subsequent repetition transmission to allocate frequency resources necessary for packet decoding to be OK. [Prior art documents] [Non-patent literature]

[0008] [Non-Patent Document 1] 3GPP TR 38.913 V14.3.0, "Study on Scenarios and Requirements for Next Generation Access Technologies (Release 14)" (2017-06) [Non-Patent Document 2] R1-1719404, "On supporting ultra-reliability in a resource efficient way", Huawei, HiSilicon, December 2017 [Non-Patent Document 3] 3GPP TR 38.212 V15.0.0, “NR Multiplexing and channel coding (Release 15)” (2017-12) Summary of the Invention [Problem to be solved by the invention]

[0009] The buffer budget of each terminal varies over time depending on the packet scheduling timing. Therefore, it is necessary to consider a method for dynamically changing the repetition transmission method applied to each terminal.

[0010] One aspect of the present disclosure contributes to providing a transmitting device, a receiving device, a transmitting method, and a receiving method that can appropriately and dynamically change the repetition transmission method. [Means for solving the problem]

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

[0012] A receiving device according to one embodiment 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 corresponds to 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, and repeatedly transmits the data based on the repetition pattern, the repetition pattern corresponding to 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, and combines the repeatedly transmitted data, wherein the repetition pattern corresponds to control information notified to the terminal by dynamic signaling.

[0015] 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. Effect of the Invention

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

[0017] Further advantages and benefits of certain aspects of the present disclosure will become apparent from the specification and drawings, in which such advantages and / or benefits are provided by some of the embodiments and features described in the specification and drawings, respectively, but not necessarily all of which are provided to obtain one or more identical features. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 shows an example of repetition transmission [Diagram 2] FIG. 1 is a block diagram showing a partial configuration of a base station when a downlink data channel is used. [Diagram 3] FIG. 1 is a block diagram showing a partial configuration of a terminal when a downlink data channel is used. [Figure 4] A block diagram showing the configuration of a part of a base station for a terminal when an uplink data channel is used. [Diagram 5] FIG. 1 is a block diagram showing a partial configuration of a terminal when an uplink data channel is used. [Figure 6] FIG. 1 is a block diagram showing the configuration of a base station when a downlink data channel is used. [Figure 7] Block diagram showing the configuration of a terminal when using a downlink data channel [Figure 8] FIG. 1 is a block diagram showing the configuration of a base station when an uplink data channel is used. [Figure 9] FIG. 1 is a block diagram showing the configuration of a terminal when an uplink data channel is used. [Figure 10] A sequence diagram showing an example of an operation when a base station and a terminal use a downlink data channel. [Figure 11] A sequence diagram showing an example of an operation when a base station and a terminal use an uplink data channel. [Figure 12A] FIG. 13 is a diagram showing an example of the number of repetitions of a time resource and a transmission time interval (non-transmission section); [Figure 12B] FIG. 13 is a diagram showing another example of the number of repetitions of time resources and the transmission time interval (non-transmission section); [Figure 13] FIG. 1 is a diagram showing an example of the number of repetitions of frequency resources. [Figure 14] FIG. 1 is a diagram showing an example of a correspondence relationship between a frequency allocation bandwidth and a repetition rate. [Figure 15] FIG. 13 is a diagram showing an example of the correspondence relationship between the number of transmission symbols and the number of repetitions. [Figure 16] FIG. 1 shows an example of a repeat pattern according to SCS. [Figure 17]FIG. 13 is a diagram showing an example of the correspondence between SCS and repeating patterns. [Figure 18] FIG. 13 is a diagram showing another example of the correspondence between SCS and repeating patterns. [Figure 19] FIG. 13 shows another example of a repeat pattern according to SCS. [Figure 20] FIG. 13 is a diagram showing another example of the correspondence between SCS and repeating patterns. [Figure 21] FIG. 13 shows another example of a repeat pattern according to SCS. [Figure 22] FIG. 1 is a diagram showing an example of a correspondence relationship between SCS and RV order. [Figure 23] FIG. 1 is a diagram showing an example of a correspondence relationship between an uplink channel type and a repetition number. [Figure 24] FIG. 1 is a diagram showing an example of a correspondence relationship between signaling information, a frequency allocation bandwidth, and a repetition rate. [Diagram 25] FIG. 13 is a diagram showing an example of a correspondence relationship between uplink channel types and candidates for the number of repetitions. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

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

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

[0022] Therefore, it is necessary to notify an appropriate repetition pattern (repetition transmission method) according to the wireless channel conditions 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 conditions of a terminal while suppressing an increase in the amount of control information will be described.

[0024] [Communication system overview] 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 the configuration of either one of them. Similarly, one terminal may have the configurations of both the terminal 200 and the terminal 400, or may have the configuration of either one of them.

[0025] 2 is a block diagram showing a configuration of a part of a base station 100 (i.e., a transmitting 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, a repetition control unit 103 determines a repetition pattern of data for a terminal 200 (a receiving device), and a transmitting unit 109 repeatedly transmits the data based on the repetition pattern.

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

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

[0028] Fig. 4 is a block diagram showing a configuration of a part 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] 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 transmitting unit 410 repeatedly transmits the data based on the repetition pattern.

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

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

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

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

[0034] The control signal generating unit 102 generates a control signal including control information (DCI) for scheduling the terminal 200. The control information includes radio resource allocation information of a downlink data channel (also called PDSCH) input from the scheduling unit 101. The control signal generating unit 102 generates a control signal using a control information bit string configured in a format of a predetermined size, and outputs the control signal to the repetition control unit 103 and the control signal coding and 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 control information (DCI) included in the control signal input from the control signal generating 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 a repetition pattern of radio resource allocation for each TU, and includes at least one of "time domain repetition number (TU number)", "frequency domain repetition number", "transmission interval or untransmitted time (TU number)", and "RV order for each TU". Note that the frequency domain repetition number indicates the number of times to repeat the frequency resources to be allocated by adding a predetermined frequency offset (e.g., X[PRB: Physical Resource Block]). For example, when the frequency resource allocation determined by the scheduling unit 101 is PRB#n and the frequency domain repetition number determined by 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] The method of determining the repetition pattern of the data signal radio resource allocation per TU in the repetition control section 103 will be described later in detail.

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

[0039] Data encoding section 105 performs error correction encoding on the transmission data in accordance with the encoding method input from scheduling section 101 , and outputs the encoded data signal to retransmission control section 106 .

[0040] At the time of an initial (new) transmission, retransmission control unit 106 holds the coded data signal input from data coding unit 105 and outputs it to data modulation unit 107. At the time of retransmission, retransmission control unit 106 controls the held data based on the ACK / NACK result input from demodulation and decoding unit 113. Specifically, when retransmission control unit 106 receives a NACK, it outputs the corresponding held data to data modulation unit 107. On the other hand, when retransmission control unit 106 receives an ACK, it discards the corresponding held data and ends the transmission of downlink data.

[0041] Here, retransmission control section 106 outputs data of RV (Redundancy Version: pattern of redundant bits for error correction) according to the number of transmission TUs as coded data output to data modulation section 107 at the time of retransmission. For example, when an RV pattern (RV order) in which the RV differs for each number of transmission TUs is used, the receiving side (terminal 200 in this case) can improve coding gain and reception quality by combining data of multiple TUs. In addition, when an RV order in which the RV is the same for each number of transmission TUs is used, transmission processing can be simplified, and therefore 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 base station 100, and may be notified to terminal 200 by upper layer notification or the like, so that recognition may be coordinated in advance between base station 100 and terminal 200.

[0042] The data modulation unit 107 modulates the data signal inputted from the retransmission control unit 106 using a predetermined modulation scheme inputted from the scheduling unit 101, and outputs the data modulated signal to the radio resource allocation unit .

[0043] The radio resource allocation unit 108 maps the signals input as symbol sequences from the control signal coding and modulation unit 104 and the data modulation unit 107, respectively, to radio resources instructed by the scheduling unit 101 and the repetition control unit 103, and outputs the mapped signal to the transmitting unit 109. In detail, the radio resource allocation unit 108 allocates radio resources of a plurality of TUs to the data signal, based on radio resource allocation information in the TU input from the scheduling unit 101 and a repetition pattern of radio resource allocation between TUs input from the repetition control unit 103.

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

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

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

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

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

[0049] Terminal 200 shown in FIG. 7 includes an antenna 201, a receiving unit 202, a signal extracting unit 203, a control signal demodulating and decoding unit 204, a repetition control unit 205, a data demodulating unit 206, a data combining and decoding unit 207, an error detecting unit 208, a response signal generating unit 209, an encoding and modulating unit 210, a radio resource allocating unit 211, and a transmitting unit 212.

[0050] The receiving unit 202 receives the control signal and 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 wireless received signal, and outputs the baseband received signal after RF processing to the signal extraction unit 203.

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

[0052] The control signal demodulation / decoding unit 204 blindly decodes the control signal input from the signal extraction unit 203, and if it determines that the control signal is addressed to its own terminal, it outputs control information (DCI) including radio resource allocation information in 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 included in the base station 100. That is, the repetition control unit 205 determines a repetition pattern of data signal radio resource allocation between TUs for the terminal 200 based on a predetermined rule, using the control information (DCI) input from the control signal demodulation and decoding unit 204. The repetition control unit 205 outputs the determined repetition pattern to the signal extraction unit 203 and the data combining and decoding unit 207.

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

[0055] The data combining and decoding unit 207 combines repeated data between multiple TUs for the data input from the data demodulation unit 206, decodes the combined data, and outputs the decoded downlink data to the error detection unit 208. Here, when combining data, the data combining and decoding unit 207 obtains coding gain by combining the data in consideration of the RV order (RV pattern for each TU) input from the repetition control unit 205. Furthermore, in the case of retransmission data, the data combining and decoding unit 207 can improve reception quality by combining data including the data from the previous transmission.

[0056] Error detection section 208 performs error detection using CRC on the data input from data decoding section 207, determines whether the data is ACK (no error) or NACK (error), and outputs the determination result to response signal generation section 209. Furthermore, error detection section 208 acquires the received data if there is no error in the data.

[0057] The response signal generating unit 209 generates a response signal (bit sequence) to the received downlink channel data based on the error detection result (ACK or NACK) inputted from the error detecting unit 208 , and outputs the response signal to the coding and modulating unit 210 .

[0058] The encoding and modulation unit 210 performs error correction encoding and modulation on the bit sequence inputted from the response signal generation unit 209 , and outputs the symbol sequence to the wireless 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 predetermined radio resources, and outputs the mapped signal to the transmitting unit 212 .

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

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

[0062] The base station 300 shown in FIG. 8 includes a scheduling unit 301, a control signal generating unit 302, a repetition control unit 303, a control signal coding and modulation unit 304, a radio resource allocation unit 305, a transmitting unit 306, an antenna 307, a receiving unit 308, a signal extracting unit 309, a data demodulating unit 310, a data combining and decoding unit 311, and an error detecting unit 312.

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

[0064] That is, the scheduling unit 301 determines radio resource allocation information in a specific TU of a control signal and an uplink data channel (also called PUSCH) for the terminal 400, and outputs the determined radio resource allocation information to the control signal generating unit 302, the signal extracting unit 309, and the data demodulating unit 310. Furthermore, when the determination result of the previously transmitted data input from the error detecting unit 312 is NACK, the scheduling unit 301 preferentially schedules retransmission data of the uplink data channel.

[0065] The control signal generating unit 302 uses the radio resource allocation information input from the scheduling unit 301 to generate control information (DCI) using a control information bit string configured in a format of a predetermined size, and outputs the generated control information to the repetition control unit 303 and the control signal coding and modulation unit 304.

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

[0067] The control signal encoding / modulation unit 304 modulates and encodes the bit sequence inputted 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 coding and modulation unit 304 to a predetermined radio resource, and outputs the mapped signal to the transmitting unit 306 .

[0069] The transmitting section 306 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and up-conversion on the signal input from the wireless resource allocating section 305 , and transmits the wireless signal to the terminal 400 via the antenna 307 .

[0070] The receiving 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 RF processing to the signal extraction unit 309.

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

[0072] That is, the signal extraction unit 309 extracts a signal portion including an uplink data channel from the received baseband signal 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 the TUs input from the repetition control unit 303, and outputs the signal portion to the data demodulation unit 310.

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

[0074] The data combining and decoding unit 311 combines repeated data between multiple TUs for the data input from the data demodulation unit 310, decodes the combined data, and outputs the decoded downlink data to the error detection unit 312. When combining, the data combining and decoding unit 311 obtains coding gain by combining in consideration of the RV order (RV pattern for each TU) input from the repetition control unit 303. In addition, in the case of retransmission data, the data combining and decoding unit 311 can improve reception quality by combining data including the data from the previous transmission.

[0075] The error detection unit 312 performs error detection using CRC on the data input from the data combining and decoding unit 311, determines whether the data is ACK or NACK, and outputs the determination result to the scheduling unit 301. Furthermore, the error detection unit 312 acquires the received data if there is no error.

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

[0077] Terminal 400 shown in FIG. 9 includes an antenna 401, a receiving section 402, a signal extracting section 403, a control signal demodulating and decoding section 404, a repetition control section 405, a data encoding section 406, a retransmission control section 407, a data modulation section 408, a radio resource allocation section 409, and a transmitting section 410.

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

[0079] That is, the receiving unit 402 receives the control signal and 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 wireless received signal, and outputs the baseband received signal after RF processing to the signal extraction unit 403.

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

[0081] The control signal demodulation / decoding unit 404 blindly decodes the control signal input from the signal extraction unit 403, and if it determines that the control signal is addressed to its own terminal, it outputs control information (DCI) including radio resource allocation information in 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 determines a repetition pattern for allocating radio resources for data signals between TUs for the terminal 400 based on a predetermined rule, using the control information (DCI) input from the control signal demodulation and decoding unit 404. 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, the retransmission control unit 407, the data modulation unit 408, the radio resource allocation unit 409, and the transmission unit 410 perform the same operations as the data encoding unit 105, the retransmission control unit 106, the data modulation unit 107, the radio resource allocation unit 108, and the 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 in accordance with the encoding method included in the control information (DCI) input from the control signal demodulation and 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 coded data signal input from the data coding unit 406 and outputs it to the data modulation unit 408. At the time of retransmission, the retransmission control unit 407 outputs the held data at the time of the first transmission to the data modulation unit 408. Here, the retransmission control unit 407 outputs RV data according to the number of transmission TUs as coded data to be 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 using a predetermined modulation scheme indicated by the control information (DCI) from the control signal demodulation and decoding unit 404, and outputs the data modulated signal to the radio resource allocation unit 409.

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

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

[0089] [Operation of base station and terminal] The operations of base stations 100, 300 and terminals 200, 400 having the above configuration will now be described in detail.

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

[0091] Base station 100 determines radio resource allocation information regarding downlink resources for terminal 200 and generates DCI (ST101). Then, base station 100 determines a repetition pattern of data (downlink data channel) for terminal 200 (i.e., a 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, base station 100 transmits a PDCCH including the DCI generated in ST101 to terminal 200 (ST103). On receiving the PDCCH, terminal 200 determines a data repetition pattern for terminal 200 (that is, a repetition pattern of radio resources for data signals between TUs) in the same manner as in ST102, based on radio resource allocation information indicated in the DCI included in the PDCCH (ST104).

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

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

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

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

[0097] Terminal 400 then repeatedly transmits data (PUSCH) (ST205) based on the radio resource allocation information acquired in ST203 and the repetition pattern determined in ST204. When base station 300 receives data (PUSCH) in ST205 based on the radio resource allocation information determined in ST201 and the repetition pattern determined in ST202, it 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 other hand, the subcarrier spacing (SCS) is a parameter set from BWP allocation information (Bandwidth part indicator) included in the DCI. The SCS used for data is set in advance for each BWP. Therefore, the terminals 200 and 400 can implicitly know the SCS to be used based on the BWP specified by the DCI. In other words, the SCS can be said to be a parameter that is implicitly notified by the DCI.

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

[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) Number of repetitions of time resource (2) The number of repetitions of frequency resources (including the specified frequency interval and number of repetitions) (3) Transmission time interval or non-transmission interval (4) RV order (RV pattern for each transmitted TU)

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

[0106] As shown in Fig. 12A and Fig. 12B, the number of repetitions of time resources indicates the number of repetitions in units of TU. Similarly, the transmission time interval or the non-transmitted section indicates the time in units of TU. Fig. 12A shows an example where the number of repetitions of time resources is 4 [TU] and the transmission time interval is 0 [TU]. Also, Fig. 12B shows an example where the number of repetitions of time resources is 4 [TU] and the transmission time interval is 1 [TU]. Fig. 12B has an untransmitted section, whereas Fig. 12A does not have an untransmitted section, so that Fig. 12A can reduce delay compared to Fig. 12B. Meanwhile, in Fig. 12B, feedback information is obtained from the receiving side during the non-transmitted section, so that radio resources for subsequent data transmission can be efficiently allocated.

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

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

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

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

[0111] The RV order is not limited to {0, 0, 0, 0} or {0, 2, 3, 1}, and may be other patterns.

[0112] <How to determine the repetition pattern> Next, a specific example of a method for determining a repetitive pattern will be described.

[0113] (Example 1: Frequency allocation bandwidth base) In the first specific example, 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 narrower the frequency allocation bandwidth, the more the number of repetitions of the time resource (or frequency resource) is increased.

[0115] For example, as shown in Fig. 14, when the frequency allocation bandwidth (number of PRBs) per TU is larger 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 equal to or smaller than the predetermined bandwidth (X [PRB]), the number of repetitions is set to 4. In other words, when the frequency allocation bandwidth per TU is equal to or smaller than the predetermined bandwidth X, the number of repetitions is set to (4), which is larger than the number of repetitions (2) when the frequency allocation bandwidth per TU is larger than the predetermined bandwidth X, in order to improve reception quality by the synthesis gain due to repetition.

[0116] This allows the repetition control sections 103, 205, 303, and 405 to dynamically set the repetition pattern in accordance with the frequency allocation bandwidth set for the terminals 200 and 400, thereby making it possible to prevent degradation of reception quality.

[0117] Furthermore, 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 notifying the frequency allocation bandwidth. This makes it unnecessary to explicitly notify the repetition pattern, and therefore makes it possible to prevent an increase in the DCI size.

[0118] Note that the correspondence relationship between the frequency allocation bandwidth and the repetition pattern (repetition number) shown in Fig. 14 is an example, and is not limited to this. For example, the predetermined threshold (X in Fig. 14) is not limited to one, and multiple thresholds may be set, and the repetition number may be set to a larger value as the frequency allocation bandwidth becomes narrower. Also, the repetition number is not limited to 2 or 4, and may be another value.

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

[0120] As in Specific Example 1, if the packet size (payload size) is the same, it is assumed that the smaller the number of transmission symbols, the higher the coding rate and the lower the reception quality. Therefore, in Specific Example 2, the smaller the number of transmission symbols, the more the number of repetitions 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 more than a predetermined number of symbols (X [symbol]), the number of repetitions is set to 2. On the other hand, when the number of transmission symbols per TU is equal to or less than the predetermined number of transmission symbols (X [symbol]), the number of repetitions is set to 4. In other words, when the number of transmission symbols per TU is equal to or less than the predetermined number of symbols X, the number of repetitions is set to (4), which is greater than the number of repetitions (2) when the number of transmission symbols per TU is greater than the predetermined number of symbols, in order to improve reception quality by using a synthesis gain achieved by repetition.

[0122] This allows the repetition control sections 103, 205, 303, and 405 to dynamically set the repetition pattern according to the number of transmission symbols set in the terminals 200 and 400, thereby preventing deterioration of reception quality.

[0123] Furthermore, 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 terminals 200 and 400 by notifying the number of transmission symbols. This makes it unnecessary to explicitly notify the repetition pattern, thereby preventing an increase in the DCI size.

[0124] Note that the correspondence relationship between the number of transmission symbols and the repetition pattern (repetition number) shown in Fig. 15 is an example and is not limited to this. For example, the predetermined threshold (X in Fig. 15) is not limited to one, but may be set to multiple values, and the repetition number may be set to a larger value as the number of transmission symbols decreases. Also, the repetition number is not limited to 2 or 4, and may be another value.

[0125] (Example 3: Subcarrier Spacing (SCS) based) In the third specific example, the repetition pattern is determined according to the SCS used for the data channel.

[0126] 16, the wider the SCS, the shorter the length of one symbol (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 interval when SCS = 30 kHz and 60 kHz is made longer than the transmission interval when SCS = 15 kHz. Specifically, the transmission interval when SCS = 30 kHz and 60 kHz is set to 1 [TU], and the transmission interval when SCS = 15 kHz is set to 0 [TU]. That is, as shown in Fig. 16, when SCS = 15 kHz, data is transmitted in consecutive TUs, and when SCS = 30 kHz and 60 kHz, data is transmitted in non-consecutive TUs with a non-transmission section (1 TU) between them.

[0128] Therefore, when SCS=30 kHz or 60 kHz, the transmitting side can obtain feedback information from the receiving side during non-transmission intervals, and can carry out subsequent transmissions efficiently.

[0129] Also, as shown in Fig. 17, the number of repetitions when SCS = 60 kHz may be greater than the number of repetitions when SCS = 15 kHz and 30 kHz. Specifically, the number of repetitions when SCS = 60 kHz is set to 4 [TU], and the number of repetitions when SCS = 15 kHz and 30 kHz is set to 2 [TU]. This allows a larger composite gain to be obtained when SCS = 60 kHz.

[0130] As shown in FIG. 16, the wider the SCS, the shorter the length of one symbol. Therefore, even if the transmission interval is made longer or the number of repetitions is increased as the SCS becomes wider, the delay time of repeatedly transmitted data does not increase.

[0131] Furthermore, 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 one symbol length), the more untransmitted intervals can be secured, and the transmitting side can reliably receive and process feedback information from the receiving side. In other words, an appropriate timing for receiving feedback information can be set for each SCS.

[0132] This allows the repetition control sections 103, 205, 303, and 405 to dynamically set the repetition pattern in accordance with the SCS set in the terminals 200 and 400, thereby making it possible to prevent degradation of reception quality.

[0133] Furthermore, the repetition pattern is uniquely derived based on the SCS that is 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 notifying the SCS based on the BWP information. This makes it unnecessary to explicitly notify the repetition pattern, and therefore makes it possible to prevent an increase in the DCI size.

[0134] 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=15kHz, 30kHz, the number of repetitions=2TU is set, and therefore, the RV order={0, 3} used for transmission of 2TUs is set. On the other hand, when SCS=60kHz, the number of repetitions=4TU is set, and therefore, the RV order={0, 2, 3, 1} used for transmission of 4TUs is set. That is, the number of RVs included in the RV order in each SCS is the same as the number of repetitions set for each SCS. This allows the number of repetitions and the RV order to be set according to the SCS, and thus, deterioration of reception quality can be prevented. Also, as described above, the number of repetitions and the RV order are uniquely derived based on the SCS implicitly notified by the DCI, and therefore, an increase in the DCI size can be prevented.

[0136] Also, even if 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 one symbol length, and therefore the shorter the processing time until the next transmission. Therefore, for example, as shown in Fig. 22, the wider the SCS, the more an RV order with less change in the RV pattern is set.

[0138] Specifically, when SCS=15 kHz, the time per TU is long and there is ample processing time, so RV order = {0, 2, 3, 1}, which has a different RV pattern for each TU, is set. This provides coding gain.

[0139] On the other hand, with SCS=60kHz, the time per TU is short and there is no room for processing, so the same RV pattern is set for each TU, RV order ={0, 0, 0, 0} (i.e., the RV order does not change). This prevents an increase in delay.

[0140] In addition, since the time per TU is shorter when SCS=30kHz compared to when SCS=15kHz, RV order = {0, 3, 0, 3} is set, which causes less change in the RV pattern than the RV order when SCS=15kHz. In other words, since the time per TU is longer when SCS=30kHz compared to when SCS=60kHz, RV order = {0, 3, 0, 3} is set, which causes more change in the RV pattern than the RV order when SCS=60kHz.

[0141] This allows the RV order to be set according to the SCS, thereby preventing delay increase and deterioration of reception quality. Also, the RV order is uniquely derived based on the SCS that is implicitly calculated from the BWP information included in the DCI. That is, the RV order is implicitly notified to the terminals 200 and 400 by the notification of the SCS. This makes it unnecessary to explicitly notify the RV order, thereby preventing an increase in the DCI size.

[0142] It should be noted that the correspondence between the SCS and the repetition pattern (repetition number, transmission interval, RV order) shown in Figures 16 to 22 is an example and is not limited to this. For example, the SCS value is not limited to 15 kHz, 30 kHz, and 60 kHz, and may be other values ​​(e.g., 120 kHz, 240 kHz). The repetition pattern associated with the SCS may be at least one of the repetition number, the transmission time interval, and the RV order. The values ​​of the repetition number, the transmission interval, and the RV order are not limited to the values ​​shown in Figures 16 to 22, and may be other values. For example, in Figures 17 and 18, the repetition pattern associated with the SCS may be either one of the repetition number and the transmission time interval.

[0143] (Example 4: Based on upstream channel type) In the fourth specific example, the repetition pattern is set according to the type of upstream channel, specifically, whether the assigned upstream channel is SUL or not.

[0144] NR stipulates that terminals that support LTE and NR use the LTE frequency band supplementarily in NR uplink transmission. The supplementary band allocated in this NR uplink transmission is called "SUL (Supplementary uplink)".

[0145] SUL, which uses the LTE band, is expected to have a lower carrier frequency than non-SUL, which uses the NR band. The lower the carrier frequency, the smaller the path loss, so SUL is expected to have higher reception quality than non-SUL.

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

[0147] This allows the repetition control sections 103, 205, 303, and 405 to dynamically set the repetition pattern in accordance with the type of uplink channel set in the terminals 200 and 400, thereby making it possible to prevent degradation of reception quality.

[0148] Furthermore, 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 the terminals 200 and 400 by notifying the uplink channel type. This makes it unnecessary to explicitly notify the repetition pattern, thereby preventing an increase in the DCI size.

[0149] It should be noted that the correspondence between the uplink channel types and the repetition patterns (repetition numbers) shown in Fig. 23 is merely an example, and is not limited to this. That is, the repetition number is not limited to 2 or 4, and may be another value.

[0150] Specific examples 1 to 4 have been described above.

[0151] In this manner, in this embodiment, the repetition pattern is associated with control information that is explicitly or implicitly notified to the terminals 200, 400 by DCI (dynamic signaling). This allows the base stations 100, 300 to dynamically control the repetition pattern for the terminals 200, 400 by the notification of DCI. That is, the terminals 200, 400 can dynamically change the repetition pattern for the terminals 200, 400 by the notification of DCI from the base stations 100, 300.

[0152] Furthermore, the repetition pattern is implicitly notified to the terminals 200 and 400 by parameters other than the repetition pattern (for example, radio resource allocation information). This makes it possible to eliminate the need for explicit signaling for notifying the repetition pattern when dynamically controlling the repetition pattern.

[0153] As described above, according to this embodiment, the repetition transmission method can be dynamically changed appropriately, and 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 be applied to repetition transmission for the purpose of improving coverage performance in mMTC, and the same effect can be obtained.

[0156] (2) In the above embodiment, the repetition pattern of the radio resource allocation for data signals between TUs is implicitly notified by DCI, but the present invention is not limited to this. For example, DCI information used to indicate the repetition pattern may be added and combined with the example in the above embodiment. For example, as shown in FIG. 24, 1-bit information indicating the repetition pattern may be included in the DCI to determine the repetition number. Specifically, in FIG. 24, candidates (1, 4) or (2, 8) of the repetition pattern (repetition number) are determined according to the frequency allocation bandwidth as in the specific example 1 (FIG. 14), and the repetition number is determined from the determined candidates according to the 1-bit information included in the DCI.

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

[0158] 24 is an example, and the parameter for determining the repetition pattern in combination with 1-bit DCI information is not limited to the frequency allocation bandwidth, but may be other parameters (number of transmission symbols, SCS, uplink channel type). Also, the repetition pattern is not limited to the number of repetitions, but may be other values ​​(transmission interval, RV order).

[0159] (3) In addition, based on parameters (control information) explicitly or implicitly notified by DCI, candidates for repetition patterns for allocating radio resources for data signals between TUs may be determined, and the repetition pattern to be actually applied may be selected from the candidates and notified by DCI information.

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

[0161] 25, by adding two bits to the DCI to notify the repetition pattern, the base stations 100 and 300 can dynamically select the optimal repetition number from among the candidates according to the wireless channel conditions of the terminals 200 and 400. This makes it possible to set an appropriate repetition pattern according to the wireless channel conditions of the terminals 200 and 400, although the DCI size increases slightly (by two bits).

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

[0163] (4) The relationship between the control information explicitly or implicitly notified by DCI and the repetition pattern of radio resource allocation for data signals between TUs (FIGS. 14, 15, 17, 18, 20, 22 to 25), which is described in the above embodiment, may be set by the base stations 100 and 300 for each terminal 200 and 400 by higher layer notification. This makes it possible to set a repetition pattern suitable for each terminal 200 and 400. Furthermore, the relationship between the above parameters and the repetition pattern may be specified for each cell or by specifications. This makes it possible to reduce the overhead of higher layer notification.

[0164] (5) Furthermore, a repetition pattern of radio resource allocation for data signals between TUs may be determined according to the type of data waveform used by terminals 200 and 400. When the data waveform is DFT-S-OFDM, it has the advantage of a low PAPR (Peak to Average Power Ratio), but is characterized by degraded reception performance compared to when the data waveform is OFDM. Thus, by setting the number of repetitions in the case of DFT-S-OFDM to be greater than the number of repetitions in the case of OFDM, it is possible to prevent degradation of reception quality in the case of DFT-S-OFDM.

[0165] Also, a repetition pattern of data signal radio resource allocation between TUs may be determined according to the CP (Cyclic Prefix) type used by the terminals 200 and 400. A cell using an ECP (Extended CP) is expected to have a larger cell radius than a cell using an 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, it is possible to prevent degradation of reception quality when ECP is used.

[0166] In addition, the type of data waveform or the 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 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) shown in Figures 14, 15, 17, 18, 20, and 22 to 25 is just an example. Any of the correspondence relationships shown in Figures 14, 15, 17, 18, 20, and 22 to 25 may be combined.

[0168] (7) 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, in part or in whole, as an LSI, which is an integrated circuit, and each process described in the above embodiment may be controlled, in part or in whole, 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 an integrated circuit technology that can replace LSI appears due to the progress of semiconductor technology or a different derived technology, it is natural that such technology may be used to integrate the functional blocks. The application of biotechnology, etc. is also a possibility.

[0169] The present disclosure may be implemented in any type of apparatus, device, or system having a communication capability (collectively, communication apparatus). Non-limiting examples of communication apparatus include telephones (e.g., mobile phones, smartphones, etc.), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks, etc.), cameras (e.g., digital still / video cameras), digital cameras, etc. Examples of such devices include digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smart watches, tracking devices), game consoles, digital book readers, telehealth and telemedicine devices, communicating vehicles or mobile conveyances (e.g., cars, airplanes, ships), and combinations of the above.

[0170] 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.

[0171] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0172] 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.

[0173] 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.

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

[0175] In the transmitting 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 greater the number of repetitions.

[0176] In the transmitting device of the present disclosure, the narrower the bandwidth allocated to the terminal, the greater the number of repetitions.

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

[0178] In the transmitting device of the present disclosure, the repetition pattern includes at least the number of repetitions of the data, and the wider the subcarrier spacing set in the terminal, the greater the number of repetitions.

[0179] In the transmitting device of the present disclosure, the repetition pattern further includes an RV order that represents the transmission order of RVs, and the number of RVs included in the RV order in each subcarrier interval is the same as the repetition number set for each subcarrier interval.

[0180] In the transmitting device of the present disclosure, the repetition pattern includes at least a transmission interval of the data that is repeatedly transmitted, and the wider the subcarrier interval set in the terminal, the longer the transmission interval.

[0181] In the transmitting device of the present disclosure, the repetition pattern includes at least an RV order that indicates the transmission order of RVs, and the wider the subcarrier interval set in the terminal, the less the change in the RV pattern in the RV order.

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

[0183] The receiving device of the present disclosure comprises 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 corresponds to 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, and repeatedly transmits the data based on the repetition pattern, the repetition pattern being 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, and combines the repeatedly transmitted data, wherein the repetition pattern corresponds to control information notified to the terminal by dynamic signaling. [Industrial Applicability]

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

[0187] One aspect of the present disclosure is useful for mobile communication systems. [Explanation of symbols]

[0188] 100,300 base stations 200,400 devices 101,301 Scheduling Department 102,302 Control signal generator 103,205,303,405 Repetition control section 104,304 Control signal coding and modulation section 105,406 Data Encoding Section 106,407 Retransmission control section 107,408 Data Modulation Section 108,211,305,409 Radio resource allocation section 109,212,306,410 Transmitter 110,201,307,401 Antenna 111,202,308,402 Receiver 112,203,309,403 Signal Extraction Unit 113 Demodulation and Decoding Section 204,404 Control signal demodulation and decoding section 206,310 Data demodulation section 207,311 Data synthesis and decoding unit 208,312 Error detection unit 209 Response signal generator 210 Encoding and modulation section

Claims

1. A transmitting unit that transmits downlink control information to a terminal device; a receiving unit that receives the data transmitted from the terminal device in a repetition pattern determined based on whether the data is assigned to a Supplemental uplink (SUL) or not, as indicated by the downlink control information; Equipped with Communications equipment.

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 communication 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 communication 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 communication 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 communication 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 communication 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 communication 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 communication 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 communication device according to claim 1 .

10. transmitting downlink control information to a terminal; receiving the data transmitted from the terminal in a repetition pattern determined based on whether the data is assigned to a Supplemental uplink (SUL) as indicated by the downlink control information; Equipped with Communication methods.

11. A process of transmitting downlink control information to a terminal; receiving the data transmitted from the terminal in a repetition pattern determined based on whether the data is assigned to a Supplemental uplink (SUL) as indicated by the downlink control information; Controlling Integrated circuits.

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