System and communication method

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-byte packet data volume of 10 , ,

[0004] or less (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).

[0004] In order to satisfy the above-mentioned requirements of URLLC, it has been considered 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 combining 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).

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

[0006] For example, the repetition transmission method shown in Figure 1(a) is suitable when the delay buffer budget (the remaining time from the initial packet transmission (e.g., timing #n) to the requested packet delay budget timing) is small. Specifically, in Figure 1(a), packets are repeatedly transmitted at continuous intervals (timing #n, #(n+1)). By transmitting repetitions without any untransmitted intervals (gap intervals) in this way, delay can be reduced. On the other hand, because the receiving conditions cannot be adequately considered on the transmitting side, excessive wireless resource allocation may occur for repetition data, which can reduce the efficiency of wireless resource utilization.

[0007] The repetition transmission method shown in Figure 1(b) is suitable when the delay buffer budget is large. In Figure 1(b), packets are repeatedly transmitted over a non-continuous time interval including the gap section (timing #n, #(n+2)). By receiving feedback information from the receiver during the gap section, the transmitter can efficiently allocate radio resources for subsequent repetition data. For example, if the packet decoding is OK (no errors), the receiver can use the feedback information to instruct the transmitter to stop subsequent repetition transmissions. Also, if the packet decoding fails (errors), the receiver can use the feedback information to instruct subsequent repetition transmissions to allocate the necessary frequency resources to enable packet decoding. [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) [Overview of the project] [Problems that the invention aims to solve]

[0009] The buffer budget for each terminal, as described above, fluctuates over time depending on the packet scheduling timing. Therefore, it is necessary to consider a method for dynamically changing the reputation transmission method applied to each terminal.

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

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

[0012] A receiving device according to one aspect of the present disclosure comprises a determination circuit for determining a repeating pattern of data to a terminal, a receiving circuit for receiving the repeatedly transmitted data based on the repeating pattern, and a decoding circuit for synthesizing the repeatedly transmitted data, wherein the repeating 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 involves determining a repeating pattern of data to a terminal, repeatedly transmitting the data based on the repeating pattern, and the repeating 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 repeating pattern of data to a terminal, receives the repeatedly transmitted data based on the repeating pattern, synthesizes the repeatedly transmitted data, and associates the repeating pattern with control information notified to the terminal by dynamic signaling.

[0015] These comprehensive or specific embodiments may be implemented as systems, devices, methods, integrated circuits, computer programs, or recording media, or as any combination of systems, devices, methods, integrated circuits, computer programs, and recording media. [Effects of the Invention]

[0016] According to one aspect of this disclosure, the method of sending reputations can be appropriately and dynamically changed.

[0017] Further advantages and effects of one aspect of this disclosure will be made apparent from the specification and drawings. Such advantages and / or effects are provided by several embodiments and features described in the specification and drawings, but not all of them are necessarily provided in order to obtain one or more identical features. [Brief explanation of the drawing]

[0018] [Figure 1] Figure showing an example of repetition transmission [Figure 2] Block diagram showing a partial configuration of a base station when using a downlink data channel [Figure 3] Block diagram showing a partial configuration of a terminal when using a downlink data channel [Figure 4] Block diagram showing a partial configuration of a base station of a terminal when using an uplink data channel [Figure 5] Block diagram showing a partial configuration of a terminal when using an uplink data channel [Figure 6] Block diagram showing the configuration of a base station when using a downlink data channel [Figure 7] Block diagram showing the configuration of a terminal when using a downlink data channel [Figure 8] Block diagram showing the configuration of a base station when using an uplink data channel [Figure 9] Block diagram showing the configuration of a terminal when using an uplink data channel [Figure 10] Sequence diagram showing an operation example when using a downlink data channel for a base station and a terminal [Figure 11] Sequence diagram showing an operation example when using an uplink data channel for a base station and a terminal [Figure 12A] Figure showing an example of the number of repetitions of time resources and the transmission time interval (untransmitted interval) [Figure 12B] Figure showing another example of the number of repetitions of time resources and the transmission time interval (untransmitted interval) [Figure 13] Figure showing an example of the number of repetitions of frequency resources [Figure 14] Figure showing an example of the correspondence between the frequency allocation bandwidth and the number of repetitions [Figure 15] Figure showing an example of the correspondence between the number of transmission symbols and the number of repetitions [Figure 16] Figure showing an example of a repetition pattern according to SCS [Figure 17]This diagram shows an example of the correspondence between SCS and repeating patterns. [Figure 18] This diagram shows another example of the correspondence between SCS and repeating patterns. [Figure 19] Figure showing another example of a repeating pattern corresponding to SCS [Figure 20] This diagram shows another example of the correspondence between SCS and repeating patterns. [Figure 21] Figure showing another example of a repeating pattern corresponding to SCS [Figure 22] A diagram showing an example of the correspondence between SCS and RV order. [Figure 23] A diagram showing an example of the correspondence between upstream channel type and number of repetitions. [Figure 24] This diagram shows an example of the correspondence between signaling information, frequency allocation bandwidth, and repetition count. [Figure 25] This diagram shows an example of the correspondence between upstream channel type and candidate repetition counts. [Modes for carrying out the invention]

[0019] Embodiments of this disclosure will be described in detail below with reference to the drawings.

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

[0021] On the other hand, PDCCHs for URLLC (also known as NR-PDCCHs) in particular require an even lower error rate to control URLLC packets, which demand high reliability. To reduce the transmission error rate of NR-PDCCHs, the DCI format size advertised by NR-PDCCHs needs to be made smaller.

[0022] Therefore, it is necessary to notify the 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 this disclosure, a method for dynamically notifying a repeating pattern according to the wireless channel status of a terminal while suppressing an increase in the amount of control information is described.

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

[0025] Figure 2 is a block diagram showing a part of the configuration 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 Figure 2, the repetition control unit 103 determines a repeating pattern of data to the terminal 200 (receiving device), and the transmitting unit 109 repeatedly transmits data based on the repeating pattern.

[0026] Figure 3 is a block diagram showing a part of the 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 Figure 3, the repetition control unit 205 determines a repeating pattern of data to the terminal 200, the signal extraction unit 203 receives (extracts) the repeatedly transmitted data based on the repeating pattern, and the data synthesis and decoding unit 207 synthesizes the repeatedly transmitted data.

[0027] In Figures 2 and 3, the repeating data patterns are associated with control information notified to terminal 200 via dynamic signaling (DCI).

[0028] Figure 4 is a block diagram showing a part of the 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 Figure 4, the repetition control unit 303 determines a repeating pattern of data to the terminal 400 (transmitter), the signal extraction unit 309 receives (extracts) the repeatedly transmitted data based on the repeating pattern, and the data synthesis and decoding unit 311 synthesizes the repeatedly transmitted data.

[0029] Figure 5 is a block diagram showing a part of the 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 Figure 5, the repetition control unit 405 determines a repeating pattern of data to the terminal 400, and the transmission unit 410 repeatedly transmits data based on the repeating pattern.

[0030] In Figures 4 and 5, the repeating data patterns are associated with control information notified to terminal 400 via dynamic signaling (DCI).

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

[0032] The base station 100 shown in Figure 6 includes a scheduling unit 101, a control signal generation unit 102, a repetition control unit 103, a control signal coding / 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 transmission unit 109, an antenna 110, a receiving unit 111, a signal extraction unit 112, and a demodulation / decoding unit 113.

[0033] The scheduling unit 101 determines the control signals for the terminal 200 (also called PDCCH, NR-PDCCH, DL assignment) and the 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 predetermined packet transmission time unit (TTI, slot, mini-slot, etc.; hereinafter referred to as "TU: Transmission Unit") of the downlink data channel (also called PDSCH). 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 that includes control information (DCI) for scheduling the terminal 200. The control information includes wireless 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 sequence configured in a predetermined size format and outputs it to the repetition control unit 103 and the control signal coding / modulation unit 104.

[0035] The repetition control unit 103 uses the control information (DCI) included in the control signal input from the control signal generation unit 102 to determine a repetition pattern (repetition pattern) for allocating wireless resources for data signals per TU to the terminal 200, based on predetermined rules. The repetition control unit 103 outputs the determined repetition pattern to the wireless resource allocation unit 108 and the retransmission control unit 106.

[0036] Here, the repeating pattern is the repeating pattern of radio resource allocation for each TU, and includes at least one of the following: "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 for each TU". The number of repetitions in the frequency domain refers to the number of times the allocated frequency resource is repeated 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 PRB#(X+n) that is allocated to PRB#n.

[0037] Details of how the repetition pattern for allocating wireless resources for data signals per TU in the repetition control unit 103 is determined will be described later.

[0038] The control signal coding and modulation unit 104 modulates and encodes the bit sequence input from the control signal generation unit 102, and outputs the resulting symbol sequence to the wireless resource allocation unit 108.

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

[0040] The retransmission control unit 106 holds the encoded data signal input from the data encoding unit 105 during the initial (new) transmission and outputs it to the data modulation unit 107. Furthermore, during retransmission, the retransmission control unit 106 controls the held data based on the ACK / NACK result input from the demodulation / decoding unit 113. Specifically, if the retransmission control unit 106 receives a NACK, it outputs the corresponding held data to the data modulation unit 107. On the other hand, if 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 RV (Redundancy Version: a pattern of redundant bits for error correction) data corresponding to the number of transmitted TUs as encoded data output to the data modulation unit 107 during retransmission. For example, if a different RV pattern (RV order) is used for each number of transmitted TUs, the receiving side (terminal 200 in this case) can improve the encoding gain and reception quality by combining the data of multiple TUs. Also, if the same RV order is used for each number of transmitted TUs, the transmission process can be simplified, thus reducing the delay time required for data transmission. The RV order applied to each terminal 200 or each cell may be determined by the base station 100 and communicated to the terminal 200 via upper-layer notification, etc., so that the base station 100 and the terminal 200 can agree on it in advance.

[0042] The data modulation unit 107 modulates the data signal input from the retransmission control unit 106 using a predetermined modulation scheme input from the scheduling unit 101, and outputs the modulated data signal to the wireless resource allocation unit 108.

[0043] The wireless resource allocation unit 108 maps the signals input as symbol sequences from the control signal coding / modulation unit 104 and the data modulation unit 107, respectively, to wireless resources instructed by the scheduling unit 101 and the repetition control unit 103, and outputs the mapped signals to the transmission unit 109. In detail, the wireless resource allocation unit 108 allocates the data signals to the wireless resources of multiple TUs (Transmission units) based on the wireless resource allocation information within the TUs input from the scheduling unit 101 and the repeating pattern of wireless resource allocation between TUs input from the repetition control unit 103.

[0044] The transmitting unit 109 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and upconversion on the signal input from the wireless resource allocation unit 108, and transmits the wireless 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, which is received via the antenna 110, and outputs the RF-processed received signal to the signal extraction unit 112.

[0046] The signal extraction unit 112 extracts the radio resource portion containing the response signal for 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] Figure 7 is a block diagram showing an example configuration of terminal 200 when using the downlink data channel (PDSCH) according to this embodiment.

[0049] The terminal 200 shown in Figure 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 wireless resource allocation unit 211, and a transmission unit 212.

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

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

[0052] The control signal demodulation / decoding unit 204 blind decodes the control signal input from the signal extraction unit 203, and if it determines that the control signal is intended for its own terminal, it outputs control information (DCI) including 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 by the base station 100. That is, the repetition control unit 205 uses control information (DCI) input from the control signal demodulation / decoding unit 204 to determine a repeating pattern for allocating wireless resources for data signals between TUs to the terminal 200, based on predetermined rules. The repetition control unit 205 outputs the determined repeating pattern to the signal extraction unit 203 and the data synthesis / decoding unit 207.

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

[0055] The data synthesis and decoding unit 207 synthesizes repeated data between multiple TUs from the data input from the data demodulation unit 206, decodes the synthesized data, and outputs the decoded downlink data to the error detection unit 208. Here, during data synthesis, the data synthesis and decoding unit 207 obtains coding gain by considering the RV order (RV pattern for each TU) input from the repetition control unit 205. In addition, in the case of retransmitted data, the data synthesis and decoding unit 207 can improve reception quality by including the data from the previous transmission in the synthesis.

[0056] The error detection unit 208 performs error detection using CRC on the data input from the data decoding unit 207, determines whether it is ACK (no error) or NACK (error detected), and outputs the determination result to the response signal generation unit 209. If there are no errors in the data, the error detection unit 208 acquires the received data.

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

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

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

[0060] The transmitting unit 212 performs RF processing such as D / A conversion and upconversion 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] Figure 8 is a block diagram showing an example configuration of the base station 300 when using the uplink data channel (PUSCH) according to this embodiment.

[0062] The base station 300 shown in Figure 8 includes a scheduling unit 301, a control signal generation unit 302, a repetition control unit 303, a control signal coding and modulation unit 304, a radio resource allocation unit 305, a transmission unit 306, an antenna 307, a receiving 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, control signal generation unit 302, reputation control unit 303, control signal coding / modulation unit 304, transmission unit 306, and reception unit 308 perform the same operations as the scheduling unit 101, control signal generation unit 102, reputation control unit 103, control signal coding / modulation unit 104, transmission unit 109, and reception unit 111 of the base station 100 shown in Figure 6.

[0064] Specifically, the scheduling unit 301 determines the control signal and radio resource allocation information within a predetermined TU of 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. In addition, if the judgment result of the previously transmitted data input from the error detection unit 312 is NACK, the scheduling unit 301 prioritizes scheduling the retransmission data of the uplink data channel.

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

[0066] The repetition control unit 303 uses the control information (DCI) input from the control signal generation unit 302 to determine a repeating pattern for allocating data signal radio resources per TU to the terminal 400 based on predetermined rules. The repetition control unit 303 outputs the determined repeating pattern to the signal extraction unit 309 and the data synthesis and decoding unit 311.

[0067] The control signal coding and modulation unit 304 modulates and encodes the bit sequence input from the control signal generation unit and outputs the resulting symbol sequence to the wireless resource allocation unit 305.

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

[0069] The transmitting unit 306 performs RF (Radio Frequency) processing, such as D / A (Digital-to-Analog) conversion and upconversion, on the signal input from the wireless resource allocation unit 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 signal waveform of the uplink transmitted from the terminal 400, which is received via the antenna 307, and outputs the RF-processed received signal to the signal extraction unit 309.

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

[0072] Specifically, the signal extraction unit 309 extracts the signal portion containing the uplink data channel from the baseband received signal based on the radio resource allocation information within the TU input from the scheduling unit 301 and the repeating pattern of radio resource allocation between TUs input from the repetition control unit 303, and outputs it 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 wireless resource allocation information input from the scheduling unit 301, and outputs the demodulated uplink data channel to the data synthesis and decoding unit 311.

[0074] The data synthesis and decoding unit 311 synthesizes repeated data between multiple TUs (Transmission Units) based on the data input from the data demodulation unit 310, decodes the synthesized data, and outputs the decoded downlink data to the error detection unit 312. During synthesis, the data synthesis and decoding unit 311 obtains coding gain by considering the RV order (RV pattern for each TU) input from the repetition control unit 303. In addition, in the case of retransmitted data, the data synthesis and decoding unit 311 can improve reception quality by including the data from the previous transmission during synthesis.

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

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

[0077] The terminal 400 shown in Figure 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] The receiving unit 402, signal extraction unit 403, control signal demodulation / decoding unit 404, and reputation control unit 405 perform the same operations as the receiving unit 202, signal extraction unit 203, control signal demodulation / decoding unit 204, and reputation control unit 205 of the terminal 200 shown in Figure 7.

[0079] In other words, the receiving unit 402 receives control signals and data signals transmitted from the base station 300 via the antenna 401, performs RF processing such as down-conversion or A / D conversion on the wirelessly received signals, and outputs the RF-processed baseband received signal to the signal extraction unit 403.

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

[0081] The control signal demodulation / decoding unit 404 blind decodes the control signal input from the signal extraction unit 403, and if it determines that the control signal is intended for 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 repeating pattern for allocating wireless resources for data signals between TUs to the terminal 400, based on predetermined rules. The repetition control unit 405 outputs the determined repeating pattern to the retransmission control unit 407 and the wireless 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 Figure 6.

[0084] In other words, the data encoding unit 406 applies error correction encoding to the transmitted data according to the encoding scheme 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] The retransmission control unit 407, upon initial (new) transmission, holds the encoded data signal input from the data encoding unit 406 and outputs it to the data modulation unit 408. Furthermore, upon retransmission, the retransmission control unit 407 outputs the data from the initial transmission that it held to the data modulation unit 408. Here, the retransmission control unit 407 outputs RV data corresponding to the number of transmitted TUs as the encoded data to be output to the data modulation unit 408 during retransmission.

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

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

[0088] The transmitting unit 410 performs RF (Radio Frequency) processing such as D / A (Digital-to-Analog) conversion and upconversion 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] [Base station and terminal operation] The operation of base stations 100, 300 and terminals 200, 400 having the above configuration will be described in detail.

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

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

[0092] Next, base station 100 transmits a PDCCH containing the DCI generated in ST101 to terminal 200 (ST103). Upon receiving the PDCCH, terminal 200 determines a repeating pattern for data to terminal 200 (i.e., a repeating pattern for radio resources for data signals between TUs) in the same manner as in ST102, based on the radio resource allocation information indicated in the DCI contained in the PDCCH (ST104).

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

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

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

[0096] Next, base station 300 transmits a PDCCH containing the DCI generated in ST201 to terminal 400 (ST203). Upon receiving the PDCCH, terminal 400 determines a repeating pattern for data to terminal 400 (i.e., a repeating pattern for 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 contained in the PDCCH (ST204).

[0097] Then, terminal 400 repeatedly transmits data (PUSCH) based on the radio resource allocation information acquired in ST203 and the repeating pattern determined in ST204 (ST205). When base station 300 receives the data (PUSCH) in ST205, based on the radio resource allocation information determined in ST201 and the repeating pattern determined in ST202, it synthesizes 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 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 DCI (see, for example, Non - Patent Document 3).

[0102] On the other hand, the subcarrier interval (SCS) is a parameter set from the Bandwidth Part Indicator (BWP) allocation information included in the DCI. The SCS used for data is pre-set for each BWP. Therefore, terminals 200 and 400 can implicitly understand which SCS to use based on the BWP indicated in the DCI. In other words, the SCS can be said to be a parameter implicitly notified by the DCI.

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

[0104] <Repeating Pattern> In the following explanation, 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 resources (2) Number of repetitions of frequency resources (including a given frequency interval and number of repetitions) (3) Transmission time interval or untransmitted section (4) RV order (RV pattern for each transmitting TU)

[0105] Here, we will use Figures 12A and 12B to explain the number of repetitions of time resources, the transmission time interval, or the untransmitted section.

[0106] As shown in Figures 12A and 12B, the number of repetitions of the time resource is expressed in units of TU. Similarly, the transmission time interval or untransmitted section is also expressed in units of TU. Figure 12A shows an example where the number of repetitions of the time resource = 4 [TU] and the transmission time interval = 0 [TU]. Figure 12B shows an example where the number of repetitions of the time resource = 4 [TU] and the transmission time interval = 1 [TU]. Figure 12B has an untransmitted section, whereas Figure 12A does not, so Figure 12A can reduce delay compared to Figure 12B. On the other hand, in Figure 12B, by obtaining feedback information from the receiving side during the untransmitted section, wireless resources can be efficiently allocated to subsequent data transmission.

[0107] Next, we will explain the number of repetitions for frequency resources using Figure 13.

[0108] In Figure 13, if the frequency allocation bandwidth per TU assigned by DCI is PRB#1 to PRB#3, data allocation is repeated in frequency resources PRB#(X+1) to PRB#(X+3) with a predetermined frequency offset (X[PRB] in Figure 13). If the number of repetitions in the frequency domain increases, data allocation is repeated in frequency resources PRB#(2X+1) to PRB#(2X+3) with an additional frequency offset. On the receiving side, frequency diversity gain can be obtained by combining the data from these repeatedly allocated bandwidths.

[0109] Next, I will explain the RV order.

[0110] The RV order indicates the RV pattern to be applied in the transmission order of a given number of TUs. For example, if there are RV patterns from 0 to 3, and the RV order is defined up to the number of transmitted TUs = 4, then it is defined as {Tx1, Tx2, Tx3, Tx4} = {0, 0, 0, 0} and {0, 2, 3, 1}. Using the RV order {0, 0, 0, 0} simplifies the transmission and reception process and reduces latency because the same redundant bits are transmitted regardless of the number of transmissions, but the coding gain after synthesis is small. On the other hand, using the RV order {0, 2, 3, 1} simplifies the coding gain after synthesis because different redundant bits are transmitted depending on the number of transmissions, but the transmission and reception process becomes more complex, which may increase latency.

[0111] Note that the RV order is not limited to {0, 0, 0, 0} or {0, 2, 3, 1}; other patterns are also acceptable.

[0112] <Method for determining repeating patterns> Next, we will explain specific examples of how to determine repeating patterns.

[0113] (Specific example 1: Frequency allocation bandwidth-based) In specific example 1, the repeating pattern is determined according to the frequency allocation bandwidth per TU.

[0114] Assuming the packet size (payload size) is the same, it is expected that the narrower the frequency allocation bandwidth, the higher the coding rate and the lower the reception quality. Therefore, in specific example 1, the number of repetitions of time resources (or frequency resources) is increased as the frequency allocation bandwidth narrows.

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

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

[0117] Furthermore, the repeating pattern is uniquely derived based on the frequency allocation bandwidth included in the DCI. In other words, the repeating pattern is implicitly notified to terminals 200 and 400 by the notification of the frequency allocation bandwidth. This eliminates the need for explicit notification of the repeating pattern, thus preventing an increase in the DCI size.

[0118] Note that the correspondence between frequency allocation bandwidth and repetition pattern (number of repetitions) shown in Figure 14 is just one example and is not limited to this. For example, there is not limited to one predetermined threshold (X in Figure 14), but multiple thresholds may be set, and the number of repetitions should be set to a larger value as the frequency allocation bandwidth narrows. Also, the number of repetitions is not limited to 2 or 4, but may be other values.

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

[0120] Similar to Example 1, if the packet size (payload size) is the same, it is expected that the coding rate will increase and the reception quality will decrease as the number of transmitted symbols decreases. Therefore, in Example 2, the number of repetitions of time resources (or frequency resources) is increased as the number of transmitted symbols decreases.

[0121] For example, as shown in Figure 15, if the number of transmitted symbols per TU is greater than a predetermined number of symbols (X[symbol]), the repetition count is set to 2. On the other hand, if the number of transmitted symbols per TU is less than or equal to the predetermined number of transmitted symbols (X[symbol]), the repetition count is set to 4. In other words, when the number of transmitted symbols per TU is less than or equal to the predetermined number of symbols X, a repetition count (4) is set, which is greater than the repetition count (2) when the number of transmitted symbols per TU is greater than the predetermined number of symbols, in order to improve reception quality through the combined gain by repetition.

[0122] As a result, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the number of transmission symbols set in terminals 200 and 400, thereby preventing deterioration of reception quality.

[0123] Furthermore, the repeating pattern is uniquely derived based on the number of transmitted symbols included in the DCI. In other words, the repeating pattern is implicitly notified to terminals 200 and 400 by the notification of the number of transmitted symbols. This eliminates the need for explicit notification of the repeating pattern, thus preventing an increase in the DCI size.

[0124] Note that the correspondence between the number of transmitted symbols and the repeating pattern (number of repetitions) shown in Figure 15 is just one example and is not limited to this. For example, there is not limited to one predetermined threshold (X in Figure 15), but multiple thresholds may be set, and the number of repetitions should be set to a larger value as the number of transmitted symbols decreases. Also, the number of repetitions is not limited to 2 or 4, but may be other values.

[0125] (Specific example 3: Subcarrier spacing (SCS) based) In specific example 3, the repeating pattern is determined according to the SCS used for the data channel.

[0126] As shown in Figure 16, the wider the SCS, the shorter the 1 symbol length (the shorter the TU length). Therefore, a wider SCS allows for an increase in the number of repetitions or the transmission time interval without increasing the delay time.

[0127] Therefore, in specific example 3, as shown in Figure 17, for example, the transmission interval for SCS=30kHz and 60kHz is made longer than the transmission interval for SCS=15kHz. Specifically, the transmission interval for SCS=30kHz and 60kHz is set to 1 [TU], and the transmission interval for SCS=15kHz is set to 0 [TU]. That is, as shown in Figure 16, when SCS=15kHz, data is transmitted in continuous TUs, and when SCS=30kHz and 60kHz, data is transmitted in discontinuous TUs with an untransmitted interval (1 TU) in between.

[0128] Therefore, when SCS=30kHz or 60kHz, the transmitting side can obtain feedback information from the receiving side during the untransmitted section, enabling efficient transmission thereafter.

[0129] Furthermore, as shown in Figure 17, the number of repetitions when SCS = 60kHz may be greater than the number of repetitions when SCS = 15kHz and 30kHz. Specifically, the number of repetitions when SCS = 60kHz is set to 4 [TU], and the number of repetitions when SCS = 15kHz and 30kHz is set to 2 [TU]. This results in a greater combined gain when SCS = 60kHz.

[0130] As shown in Figure 16, the wider the SCS, the shorter the 1 symbol length. Therefore, with a wider SCS, even if the transmission interval is increased or the number of repetitions is increased, the delay time of the 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 Figure 18, the wider the SCS, the longer the transmission time interval may be defined. As a result, as shown in Figure 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 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] As a result, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the SCS set on terminals 200 and 400, thereby preventing deterioration of reception quality.

[0133] Furthermore, the repeating pattern is uniquely derived based on the SCS implicitly calculated from the BWP information included in the DCI. In other words, the repeating pattern is implicitly notified to terminals 200 and 400 by the SCS notification based on the BWP information. This eliminates the need for explicit notification of the repeating pattern, thus preventing an increase in the DCI size.

[0134] Another example is that the RV order may be set according to the number of repetitions.

[0135] For example, as shown in Figure 20, at SCS=15kHz and 30kHz, the number of repetitions is set to 2TU, so the RV order used for transmission of 2TU is set to {0, 3}. On the other hand, at SCS=60kHz, the number of repetitions is set to 4TU, so the RV order used for transmission of 4TU is set to {0, 2, 3, 1}. In other words, the number of RVs included in the RV order for each SCS is the same as the number of repetitions set for each SCS. This allows the number of repetitions and RV order to be set according to the SCS, preventing deterioration of reception quality. Furthermore, as mentioned above, the number of repetitions and RV order are uniquely derived based on the SCS implicitly notified by DCI, thus preventing an increase in the DCI size.

[0136] Furthermore, 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 Figure 21, the wider the SCS, the shorter the 1 symbol length, thus reducing the processing time until the next transmission. Therefore, as shown in Figure 22, for example, the wider the SCS, the less variation there is in the RV pattern, resulting in an RV order being set.

[0138] Specifically, at SCS=15kHz, the time per TU is long, and there is ample processing time, so an RV order ={0, 2, 3, 1} is set, where the RV pattern differs for each TU. This allows for the acquisition of coding gain.

[0139] On the other hand, with SCS=60kHz, the time per TU is short, and there is not enough processing time to spare. Therefore, the same RV order ={0, 0, 0, 0} (i.e., an RV order where the RV pattern does not change) is set for each TU. This prevents an increase in delay.

[0140] Furthermore, at SCS=30kHz, the time per TU is shorter compared to SCS=15kHz, so an RV order of {0, 3, 0, 3} is set, which results in less change in the RV pattern than the RV order at SCS=15kHz. In other words, at SCS=30kHz, the time per TU is longer compared to SCS=60kHz, so an RV order of {0, 3, 0, 3} is set, which results in greater change in the RV pattern than the RV order at SCS=60kHz.

[0141] This allows for the setting of an RV order according to the SCS, preventing increased latency and degradation of reception quality. Furthermore, the RV order is uniquely derived based on the SCS implicitly calculated from the BWP information included in the DCI. In other words, the RV order is implicitly notified to terminals 200 and 400 by the SCS notification. This eliminates the need for explicit notification of the RV order, thus preventing an increase in the DCI size.

[0142] Note that the correspondence between SCS and repeating patterns (number of repetitions, transmission interval, RV order) shown in Figures 16 to 22 is just an example and is not limited to these. For example, the SCS value is not limited to 15kHz, 30kHz, and 60kHz, but may be other values ​​(e.g., 120kHz, 240kHz). Also, the repeating pattern associated with the SCS only needs to be at least one of the number of repetitions, transmission interval, and RV order. Furthermore, the values ​​of the number of repetitions, transmission interval, and RV order are not limited to the values ​​shown in Figures 16 to 22, but may be other values. Also, for example, in Figures 17 and 18, the repeating pattern associated with the SCS may be either the number of repetitions or the transmission interval.

[0143] (Specific example 4: Based on upstream channel type) In specific example 4, the repeating pattern is set according to the upstream channel type, and more specifically, whether the assigned upstream channel is SUL or not.

[0144] NR (New Radio) stipulates that terminals supporting both LTE and NR may use the LTE frequency band as a supplement for NR uplink transmission. This supplementally allocated bandwidth for NR uplink transmission is called "SUL (Supplementary uplink)".

[0145] SUL, which uses the LTE band, is expected to have a lower carrier frequency compared to Non-SUL, which uses the NR band. Lower carrier frequencies result in less path loss, so SUL can be expected to have higher reception quality than Non-SUL.

[0146] Therefore, in specific example 4, as shown in Figure 23, for example, if the uplink channel type assigned to terminals 200 and 400 is SUL, the number of repetitions is set to 2, and if the uplink channel type assigned to terminals 200 and 400 is non-SUL, the number of repetitions is set to 4. In other words, when the uplink channel type is non-SUL, a number of repetitions (4) is set that is higher than the number of repetitions (2) when the uplink channel type is SUL, in order to improve reception quality through the combined gain by repetition.

[0147] As a result, the repetition control units 103, 205, 303, and 405 can dynamically set the repetition pattern according to the uplink channel type set on terminals 200 and 400, thereby preventing deterioration of reception quality.

[0148] Furthermore, the repeating pattern is uniquely derived based on the uplink channel type included in the DCI. In other words, the repeating pattern is implicitly notified to terminals 200 and 400 by the notification of the uplink channel type. This eliminates the need for explicit notification of the repeating pattern, thus preventing an increase in the DCI size.

[0149] Note that the correspondence between the upstream channel type and the repetition pattern (number of repetitions) shown in Figure 23 is just one example and is not limited to this. In other words, the number of repetitions is not limited to 2 or 4; other values ​​are also acceptable.

[0150] The above explains each of the specific examples 1-4.

[0151] Thus, in this embodiment, the repeating pattern is associated with control information that is explicitly or implicitly notified to terminals 200 and 400 by DCI (Dynamic Signaling). As a result, base stations 100 and 300 can dynamically control the repeating pattern for terminals 200 and 400 based on the DCI notification. In other words, terminals 200 and 400 can dynamically change the repeating pattern for terminals 200 and 400 based on the DCI notification from base stations 100 and 300.

[0152] Furthermore, repeating patterns are implicitly communicated to terminals 200 and 400 through other parameters (e.g., wireless resource allocation information). This eliminates the need for explicit signaling for repeating patterns when dynamically controlling them.

[0153] As described above, according to this embodiment, the reputation transmission method can be appropriately and dynamically changed, thereby improving system performance.

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

[0155] (1) The uses of this disclosure are not limited to URLLC. For example, one aspect of this disclosure can be applied to reputation transmission aimed at improving coverage performance in mMTC, and similar effects can be obtained.

[0156] (2) In the above embodiment, a case was described in which the DCI implicitly notifies the repeating pattern of the wireless resource allocation for data signals between TUs, but the embodiment is not limited to this. For example, additional DCI information used to indicate the repeating pattern may be added and combined with the example in the above embodiment. For example, as shown in Figure 24, the number of repetitions may be determined by including 1 bit of information that indicates the repeating pattern in the DCI. Specifically, in Figure 24, similar to Specific Example 1 (Figure 14), candidate repeating patterns (number of repetitions) (1, 4) or (2, 8) are determined according to the frequency allocation bandwidth, and the number of repetitions is determined from among the determined candidates according to the 1 bit of information included in the DCI.

[0157] This results in a slight increase in DCI size (1 bit increase), but allows for the setting of a more appropriate repeating pattern based on the wireless channel status of terminal 200.

[0158] Note that Figure 24 is just one example, and the parameters used to determine the repeating pattern in combination with 1-bit DCI information are not limited to frequency allocation bandwidth; other parameters (number of transmitted symbols, SCS, uplink channel type) may also be used. Furthermore, the repeating pattern is not limited to the number of repetitions; other values ​​(transmission interval, RV order) may also be used.

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

[0160] For example, as shown in Figure 25, if the uplink channel type is SUL, the candidate repeating patterns (number of repetitions) are {1, 2, 4, 8}, and if it is Non-SUL, the candidate repeating patterns (number of repetitions) are {1, 4, 16, 32}. As mentioned above, Non-SUL is expected to use a higher carrier frequency than SUL, so it is possible to set a larger number of repetitions than SUL.

[0161] In the case of Figure 25, by adding 2 bits to the DCI for notification of the repeating pattern, base stations 100 and 300 can dynamically select the optimal number of repetitions from the candidates according to the radio channel status of terminals 200 and 400. Although this slightly increases the DCI size (by 2 bits), it allows for the setting of an appropriate repetition pattern that is more in line with the radio channel status of terminals 200 and 400.

[0162] Note that Figure 25 is just one example, and the parameters associated with candidate repeating patterns are not limited to the uplink channel type; other parameters (frequency allocation bandwidth, number of transmitted symbols, SCS) may also be used. Furthermore, the repeating pattern is not limited to the number of repetitions; other values ​​(transmission interval, RV order) may also be used.

[0163] (4) The relationship between the control information explicitly or implicitly notified by DCI and the repeating pattern of the wireless resource allocation for data signals between TUs (Figures 14, 15, 17, 18, 20, 22-25), as described in the above embodiment, may be set by base stations 100 and 300 in upper-layer notifications for each terminal 200 and 400. This allows for the setting of a repeating pattern suitable for each terminal 200 and 400. Furthermore, the relationship between the above parameters and the repeating pattern may be defined per cell or by specification. This reduces the overhead of upper-layer notifications.

[0164] (5) Furthermore, the repetition pattern of the wireless 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 it has the characteristic of degraded reception performance compared to when the data waveform is OFDM. Therefore, by setting the number of repetitions for DFT-S-OFDM to be greater than the number of repetitions for OFDM, the degradation of reception quality in the case of DFT-S-OFDM can be prevented.

[0165] Furthermore, the repetition pattern of wireless resource allocation for data signals between TUs may be determined according to the type of CP (Cyclic Prefix) used by terminals 200 and 400. Cells using ECP (Extended CP) are expected to have a wider cell radius compared to cells using NCP (Normal CP). Therefore, by setting the number of repetitions for ECP type to be greater than the number of repetitions for NCP type, degradation of reception quality when using ECP can be prevented.

[0166] The data waveform type or CP type may also be notified by DCI.

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

[0168] (7) The disclosure can be implemented as software, hardware, or software in conjunction with hardware. Each functional block used in the description of the above embodiments may be implemented in part or in whole as an integrated circuit (LSI), and each process described in the above embodiments may be controlled in part or in whole by a single LSI or a combination of LSIs. An LSI may consist of individual chips, or it may consist of a single chip that includes some or all of the functional blocks. An LSI may have data inputs and outputs. Depending on the degree of integration, LSIs may be called ICs, system LSIs, super LSIs, or ultra LSIs. The method of integrated circuit implementation is not limited to LSIs, and may be implemented with dedicated circuits, general-purpose processors, or dedicated processors. Alternatively, an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells inside the LSI may be used. The disclosure may be implemented as digital processing or analog processing. Furthermore, if advancements in semiconductor technology or other derived technologies lead to the emergence of integrated circuit technologies that replace LSIs, then naturally, it would be possible to use those technologies to integrate functional blocks. The application of biotechnology, for example, is a possibility.

[0169] This disclosure is applicable to all types of devices, systems, and equipment with communication capabilities (collectively referred to as communication devices). Non-exclusive examples of communication devices include telephones (mobile phones, smartphones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebooks, etc.), cameras (digital still / video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smartwatches, tracking devices, etc.), game consoles, digital book readers, telehealth and telemedicine devices, vehicles or mobile transport with communication capabilities (automobiles, airplanes, ships, etc.), and combinations of the above-mentioned devices.

[0170] Communication devices are not limited to portable or movable devices, but also include all kinds of non-portable or fixed devices, devices, and systems, such as smart home devices (appliances, lighting equipment, smart meters or measuring instruments, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0171] Communication includes data communication via cellular systems, wireless LAN systems, and communication satellite systems, as well as data communication using combinations of these.

[0172] Furthermore, the communication device also includes devices such as controllers and sensors that are connected to or linked to a communication device that performs the communication functions described in this disclosure. For example, this includes controllers and sensors that generate control signals and data signals used by the communication device that performs the communication functions of the communication device.

[0173] Furthermore, communication equipment includes infrastructure facilities such as base stations, access points, and any other devices, devices, and systems that communicate with or control the aforementioned non-limited types of equipment.

[0174] The transmitting device of this disclosure comprises a determination circuit that determines a repeating pattern of data to a terminal, and a transmitting circuit that repeatedly transmits the data based on the repeating pattern, wherein the repeating pattern is associated with control information notified to the terminal by dynamic signaling.

[0175] In the transmitting device of this disclosure, the repeating pattern includes at least the number of repetitions of the data, and the number of repetitions is greater the smaller the number of resources allocated to the terminal.

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

[0177] In the transmitting device of this disclosure, the fewer the number of symbols assigned to the terminal, the greater the number of repetitions.

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

[0179] In the transmitting device of the present disclosure, the repeating pattern further includes an RV order representing the transmission order of RVs, wherein the number of RVs included in the RV order in each subcarrier interval is the same as the number of repetitions set for each subcarrier interval.

[0180] In the transmitting device of this disclosure, the repeating pattern includes at least an interval between the transmissions of the repeatedly transmitted data, and the longer the subcarrier interval set in the terminal, the longer the transmission interval.

[0181] In the transmitting device of this disclosure, the repeating pattern includes at least an RV order representing the transmission order of RVs, and the wider the subcarrier interval set in the terminal, the less the pattern of RVs in the RV order changes.

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

[0183] The receiving device of this disclosure comprises a determination circuit that determines a repeating pattern of data to a terminal, a receiving circuit that receives the repeatedly transmitted data based on the repeating pattern, and a decoding circuit that synthesizes the repeatedly transmitted data, wherein the repeating pattern is associated with control information notified to the terminal by dynamic signaling.

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

[0185] The receiving method of this disclosure determines a repeating pattern of data to a terminal, receives the repeatedly transmitted data based on the repeating pattern, synthesizes the repeatedly transmitted data, and associates the repeating pattern with control information notified to the terminal by dynamic signaling. [Industrial applicability]

[0186] All disclosures in the specification, drawings, and abstract contained in the Japanese application 2018-025857, filed on 16 February 2018, are incorporated herein by reference.

[0187] One aspect of this disclosure is useful for mobile communication systems. [Explanation of Symbols]

[0188] 100,300 base stations 200,400 terminals 101,301 Scheduling Unit 102,302 Control signal generation unit 103,205,303,405 Repetition Control Unit 104,304 Control signal coding and modulation section 105,406 Data Encoding Section 106,407 Retransmission Control Unit 107,408 Data Modulation Section 108,211,305,409 Wireless Resource Allocation Unit 109,212,306,410 Transmitter 110,201,307,401 Antennas 111,202,308,402 Receiving section 112,203,309,403 Signal extraction section 113 Demodulation / Decoding Unit 204,404 Control signal demodulation / decoding section 206,310 Data demodulation section 207,311 Data Synthesis and Decoding Unit 208,312 Error detection unit 209 Response signal generation unit 210 Encoding and Modulation Section

Claims

1. A system comprising a terminal and a base station, The aforementioned base station is A transmission unit that transmits downlink control information to the terminal, The receiving unit receives the data transmitted from the aforementioned terminal, It is equipped with, The aforementioned terminal is A receiving unit that receives the aforementioned downlink control information, A circuit that determines a repeating pattern based on whether the data, as indicated by the aforementioned downlink control information, is assigned to a Supplemental uplink (SUL), A transmitting unit that transmits the data to the base station in the determined repeating pattern, Equipped with, system.

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

3. The repeating pattern includes at least the number of repetitions of the data, The narrower the bandwidth per allocated transmission unit, the greater the number of repetitions. The system according to claim 1.

4. The repeating pattern includes at least the number of repetitions of the data, The fewer the number of symbols per assigned transmission unit, the greater the number of repetitions. The system according to claim 1.

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

6. The aforementioned repeating pattern further includes an RV order representing the transmission order of the RVs, The number of RVs included in the RV order within each subcarrier interval is the same as the number of repetitions set for each subcarrier interval. The system according to claim 5.

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

8. The aforementioned repeating pattern includes at least an RV order representing the transmission order of RVs, The wider the set subcarrier interval, the less change there is in the RV pattern in the RV order. The system according to claim 1.

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

10. A step of the base station transmitting downlink control information to a terminal, The terminal receives the downlink control information, The terminal performs the step of determining a repeating pattern based on whether or not the data indicated by the downlink control information is assigned to a Supplemental uplink (SUL), The terminal transmits the data to the base station in the determined repeating pattern, The base station receives the data transmitted from the terminal, Equipped with, Communication method.

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