Communication device and communication method

Abstract

This communication device has: a transmission unit that transmits control information and data to another communication device, said control information including at least information that relates to the transmission of said data; a control unit that causes the transmission unit to repeatedly transmit the data, without setting an ending time for the transmissions or an ending number of transmissions in advance; and a reception unit that receives, from the other device, a response corresponding to the data. When a prescribed condition has been satisfied, the control unit causes the transmission unit to stop transmitting the data.

Description

[Technical Field]

[0001] The present invention relates to a communication device and a communication method in a wireless communication system. [Background technology]

[0002] The 3GPP (3rd Generation Partnership Project) is currently studying a wireless communication system called 5G or NR (New Radio) (hereinafter, this wireless communication system will be referred to as "NR") in order to achieve a larger system capacity, a higher data transmission speed, and a lower latency in wireless sections. In 5G, various wireless technologies and network architectures are being studied to meet the requirements of achieving a throughput of 10 Gbps or more while keeping the latency in wireless sections to 1 ms or less (for example, Non-Patent Document 1).

[0003] In addition, various functions are being considered for realizing Ultra-Reliable Low Latency Communication (URLLC) in NR. For example, as an operation related to Hybrid Automatic Repeat Request (HARQ) feedback, repeat transmission is supported to improve reliability and delay performance (e.g., Non-Patent Document 2).

[0004] Furthermore, studies have begun on 6G as the next-generation wireless communication system after 5G, and it is expected to achieve wireless quality that exceeds that of 5G. For example, studies are underway for 6G to achieve even higher capacity, the use of new frequency bands, even lower latency, even higher reliability, and the expansion of coverage to new areas (high altitude, sea, and space). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 38.300 V16.3.0 (2020-09) [Non-patent document 2] 3GPP TS 38.214 V16.3.0 (2020-09) Summary of the Invention [Problem to be solved by the invention]

[0006] Regarding repeated transmission, for example, if the channel condition suddenly changes, the expected number of repeated transmissions may not be sufficient to maintain the communication quality, and the feedback may continue to be negative. As a result, the delay due to the feedback may increase and exceed the required delay limit.

[0007] The present invention has been made in view of the above points, and has as its object to reduce delays that occur when repeated transmissions are made in a wireless communication system. [Means for solving the problem]

[0008] According to the disclosed technology, a transmitter that transmits control information including at least information related to data transmission and the data to another communication device, and a transmission unit that transmits the control information including at least information related to data transmission and the data to another communication device without predetermining the time when the transmission ends or the number of times the transmission ends, , without waiting for a response corresponding to the data. A communication device is provided which has a control unit that causes the transmitting unit to repeatedly transmit the data, and a receiving unit that receives a response corresponding to the data from the other communication device, and the control unit causes the transmitting unit to stop transmitting the data when a specific condition is met. [Effects of the Invention]

[0009] The disclosed technology provides a technology that enables a reduction in delay when repeated transmission is performed in a wireless communication system. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an example (1) of a wireless communication system according to an embodiment of the present invention. [Figure 2]FIG. 2 is a diagram illustrating an example (2) of a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 10 is a diagram showing an example (1) of repeated transmission. [Figure 4] FIG. 10 is a diagram showing an example (2) of repeated transmission. [Figure 5] 10 is a flowchart illustrating an example of a transmission operation according to an embodiment of the present invention. [Figure 6] 10 is a flowchart illustrating an example of a receiving operation in the embodiment of the present invention. [Figure 7] FIG. 1 is a diagram showing an example (1) of repeated transmission in an embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing an example (2) of repeated transmission in the embodiment of the present invention. [Figure 9] FIG. 10 is a diagram showing an example (3) of repeated transmission in the embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing an example (4) of repeated transmission in the embodiment of the present invention. [Figure 11] FIG. 10 is a diagram showing an example (5) of repeated transmission in the embodiment of the present invention. [Figure 12] FIG. 10 is a diagram showing an example (6) of repeated transmission in the embodiment of the present invention. [Figure 13] FIG. 10 is a diagram showing an example (7) of repeated transmission in the embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing an example (8) of repeated transmission in the embodiment of the present invention. [Figure 15] FIG. 10 is a diagram showing an example (9) of repeated transmission according to an embodiment of the present invention. [Figure 16] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 17] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 18] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] In operation of the wireless communication system according to the embodiment of the present invention, an existing technology may be used as appropriate. The existing technology may be, for example, an existing NR or LTE, but is not limited to, an existing NR or LTE. Alternatively, the existing technology may be applied to a communication system after 5G.

[0013] Fig. 1 is a diagram illustrating an example (1) of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention may include a base station 10 and a terminal 20. Although Fig. 1 illustrates one base station 10 and one terminal 20, this is an example, and there may be a plurality of each. The following description will be given using the base station 10 and the terminal 20, but the present invention is not limited to this.

[0014] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal may be defined in the time domain and the frequency domain, where the time domain may be defined by the number of OFDM symbols and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Furthermore, a TTI (Transmission Time Interval) in the time domain may be a slot, a subframe, or one or more symbols, but is not limited to these. The modulation method is not limited to OFDM.

[0015] Base station 10 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with terminal 20. In carrier aggregation, one PCell (primary cell) and one or more SCells (secondary cells) are used. A cell (CC) may be called by a different name, and may be a predetermined processing unit of frequency resources.

[0016] The base station 10 transmits a synchronization signal, system information, and the like to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on the NR-PBCH or PDSCH, and is also called broadcast information. As shown in FIG. 1 , the base station 10 transmits control signals or data to the terminal 20 on the DL (Downlink) and receives control signals or data from the terminal 20 on the UL (Uplink). Note that, here, what is transmitted on a control channel such as PUCCH or PDCCH is called a control signal, and what is transmitted on a shared channel such as PUSCH or PDSCH is called data, but these names are merely examples. Also, the terms PSS, SSS, PBCH, and "NR-" are merely examples and are not limited to these.

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. The terminal 20 may be referred to as a UE, and the base station 10 may be referred to as a gNB.

[0018] Terminal 20 is capable of performing carrier aggregation, which aggregates multiple cells (multiple CCs (component carriers)) to communicate with base station 10. In carrier aggregation, one PCell (primary cell) and one or more SCells (secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] Fig. 2 is a diagram illustrating an example (2) of a wireless communication system according to an embodiment of the present invention. Fig. 2 shows a configuration example of a wireless communication system in which DC (Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0020] A cell group provided by the base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by the base station 10B, which is an SN, is called an SCG (Secondary Cell Group). In addition, in DC, the MCG is composed of one PCell and one or more SCells, and the SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells. Note that DC may be a communication method using two communication standards, and any communication standards may be combined. For example, the combination may be either NR and the 6G standard, or LTE and the 6G standard. In addition, DC may be a communication method using three or more communication standards, and may be called by a name other than DC.

[0021] The processing operations in this embodiment may be executed in the system configuration shown in FIG. 1, in the system configuration shown in FIG. 2, or in any other system configuration.

[0022] Here, various functions are being considered for realizing Ultra-Reliable Low Latency Communication (URLLC) in NR. For example, as an operation related to Hybrid Automatic Repeat Request (HARQ) feedback, in order to improve reliability, a NACK is fed back to request retransmission in response to a decoding error in certain data reception, and this is repeated until the data is successfully decoded. Also, in order to improve delay performance, data transmission is repeated multiple times in advance without relying on feedback. To satisfy the required URLLC performance, HARQ feedback and repeated transmission are used in combination. Note that HARQ feedback, ACK, and NACK may be device operations and information related to the success or failure of communication, and may be called by other names.

[0023] FIG. 3 is a diagram showing an example (1) of repeated transmission. FIG. 3 shows an example in which a certain transport block is repeatedly transmitted four times. As shown in FIG. 3, the receiving device does not succeed in decoding the first repeated transmission, so it feeds back a NACK to the transmitting side via the PUCCH. Since the transmitting device has fed back the NACK, it repeats transmission four more times. Since the receiving device succeeds in decoding the second repeated transmission, it feeds back an ACK to the transmitting side via the PUCCH.

[0024] A configuration in which a predetermined number of repeat transmissions and HARQ feedback are repeated may not be sufficient for the URLLC performance required in future networks (e.g., 6G). For example, if channel conditions suddenly deteriorate, the expected number of repeat transmissions and the HARQ feedback following the repeat transmissions may not achieve the desired communication quality, and NACKs may continue to be fed back. If NACKs are fed back continuously, the delay due to the feedback increases, making it impossible to meet the required URLLC performance. On the other hand, if a large number of repeat transmissions are performed from the beginning, unnecessary transmissions will increase if the channel conditions do not deteriorate.

[0025] Figure 4 shows an example of repeat transmission (2). In Figure 4, the transmitting device is assumed to successfully receive the signal by looping "four times of repeat transmission and feedback" twice, and not exceed the delay limit. However, if the channel condition suddenly deteriorates and two NACK feedbacks are generated, a third repeat transmission occurs, and the delay limit is exceeded.

[0026] Therefore, when certain data is transmitted and received, the data transmitting device transmits data without determining the end, and stops transmitting data after receiving an ACK. The end of data transmission may be the point at which data transmission ends, or the number of times data transmission ends. The data receiving device assumes that data transmission will continue until an ACK is sent, and sends an ACK if decoding is successful. Note that in the embodiment of the present invention, the communication device may be a base station 10 or a terminal 20, and is not limited to communication between a base station 10 and a terminal 20. For example, it may be applied to communication between terminals 20, or to communication between two devices.

[0027] 5 is a flowchart illustrating an example of a transmission operation in an embodiment of the present invention. In step S11, the transmitting communication device executes data transmission. In the following step S12, the transmitting communication device determines whether or not an ACK has been received. If an ACK has been received (YES in S12), the process proceeds to step S13; if an ACK has not been received (NO in S12), the process proceeds to step S11. In step S13, the transmitting communication device stops data transmission.

[0028] 6 is a flowchart illustrating an example of a receiving operation in an embodiment of the present invention. In step S21, the receiving communication device executes data reception. In the following step S22, the receiving communication device determines whether or not the data has been successfully decoded. If the data has been successfully decoded (YES in S22), the process proceeds to step S23, and if the data has not been successfully decoded (NO in S22), the process proceeds to step S21. In step S23, the receiving communication device transmits an ACK to the transmitting communication device.

[0029] FIG. 7 is a diagram showing an example (1) of repeat transmission in an embodiment of the present invention. As shown in FIG. 7, data is repeatedly transmitted until an ACK is received. In the example shown in FIG. 7, the transmitting communication device transmits the data in the slot following the slot in which the ACK is received as the final transmission. In the example shown in FIG. 7, the data transmitted for the tenth time is successfully decoded. That is, assuming a communication quality in which ten data transmissions are required, a method of repeating transmission four times and performing feedback requires three retransmissions, which exceeds the delay limit as shown in FIG. 4. On the other hand, in the example shown in FIG. 7, communication is possible without exceeding the delay limit even if ten data transmissions are required.

[0030] By applying the operations shown in Figures 5, 6 and 7, the feedback delay can be reduced and URLLC performance can be improved.

[0031] The following describes the notification or update of information related to data resources, the determination of feedback resources and feedback contents, the operation upon receiving feedback, and the operation upon failure to receive ACK in the operations shown in FIGS. 5, 6, and 7.

[0032] The following describes notification and updating of information related to data resources in an embodiment of the present invention. Fig. 8 is a diagram showing an example (2) of repeated transmission in an embodiment of the present invention. As shown in Fig. 8, resources notified by control information transmitted before or at the start of data transmission may be used repeatedly in a predetermined time unit. Fig. 8 shows an example in which the predetermined time unit is a slot. For example, the methods related to resource or data transmission shown in 1)-8) below may be used.

[0033] 1) The resource may be the same for each slot (similar to PUSCH repetition type A).

[0034] 2) The resource may be the same for each N1 symbol (similar to PUSCH repetition type B). The N1 symbols may be divided into multiple resources under certain conditions. For example, the certain conditions may include crossing a slot boundary, colliding with a resource used for reception, etc.

[0035] 3) The resource may be the same for each of the N2 slots. The resource for the N2 slots is notified by the control information.

[0036] 4) When transmitting data in the resource, the reference signal (e.g., DM-RS (Demodulation reference signal)) and MCS (Modulation and coding scheme) may be the same or may be changed for each transmission unit based on a predetermined rule.

[0037] 5) In data transmission in the resource, the RV (Redundancy version) may be changed for each transmission based on a predetermined rule. For example, it may be "000000...", "030303...", "023102...", etc.

[0038] 6) Some of the configured resources may not be used for data transmission, for example, resources used for reception may not be used for data transmission.

[0039] 7) In data transmission in the resource, the precoding may be changed for each predetermined unit of transmission based on a predetermined rule. For example, the precoder may be changed as follows: A, B, C, D, A, B, ...

[0040] 8) In data transmission using the resource, the frequency resource for frequency hopping may be changed for each predetermined unit of transmission based on a predetermined rule. For example, frequency resource A and frequency resource B may be used alternately.

[0041] Fig. 9 is a diagram showing an example (3) of repeated transmission in an embodiment of the present invention. As shown in Fig. 9, parameters notified by control information transmitted for each predetermined unit of data transmission may be applied to the predetermined unit. Fig. 9 shows an example in which the predetermined unit is four slots and control information is notified every four slots.

[0042] The above 1) to 8) may be applied for each predetermined unit. Also, it may be assumed that only some parameters are notified by the control information, and that parameters that are not notified are not changed. Also, it may be assumed that the transmission of a different transport block is notified (for example, by toggling NDI (New Data Indicator)), or that the transmission of a different transport block is notified only after an ACK is transmitted. This makes it possible to change parameters during repeated transmission based on communication quality or congestion status, allowing data transmission to be completed more quickly.

[0043] FIG. 10 is a diagram illustrating an example (4) of repeat transmission according to an embodiment of the present invention. As illustrated in FIG. 10, control information may be transmitted at any of predetermined timings. FIG. 10 illustrates an example in which control information is transmitted after data transmission has been performed for six slots, two slots, or three slots. Parameters indicated by control information transmitted at a certain timing may be applied to data transmissions from that timing onward. The above 1)-8) may be applied to data transmissions from one control information transmission to the next control information transmission. It may also be assumed that only some parameters are indicated by control information, and that parameters that are not indicated are not changed. It may also be assumed that transmission of a different transport block is indicated (for example, by toggling NDI), or that transmission of a different transport block is indicated only after transmission of an ACK. It becomes possible to change parameters at flexible timings during repeat transmission based on communication quality or congestion status.

[0044] Furthermore, the control information may be receivable by a communication device other than the data transmission destination. A communication device that receives the control information may assume that the corresponding resource cannot be used until a predetermined condition is met. The predetermined condition may be when corresponding information (e.g., ACK) is received from a transmitting device or a receiving device of data related to the control information, or when a predetermined time has elapsed since a timing related to the control information (e.g., the time of reception).

[0045] Alternatively, the transmission parameters may be changed without transmitting control information. For example, the transmission parameters may be changed when a predetermined time T0 has elapsed since a timing related to data transmission (e.g., the start of data transmission), or when the number of data transmissions reaches or exceeds a predetermined number X0. The changed parameters may be set in advance or may be associated with T0 or X0. While the parameters can be changed during repeated transmissions, the overhead of the control information does not increase.

[0046] The changed parameters or the parameters notified by the control information shown in FIG. 8 or FIG. 9 may be parameters related to any of the following 1) to 6).

[0047] 1) At least one resource selected from the group consisting of time resources, frequency resources, space resources, and code resources. 2) RS 3) RV 4) MCS 5) Beam 6) Cell or carrier

[0048] The following describes how feedback resources are determined and what feedback is provided in an embodiment of the present invention. Fig. 11 is a diagram showing an example (5) of repeated transmission in an embodiment of the present invention. As shown in Fig. 11, a corresponding feedback resource may be provided for each predetermined unit of data transmission. Fig. 11 shows an example in which the predetermined unit of data transmission is 5 slots. At least one of the time resource, frequency resource, and resource ID of the feedback resource may be notified by the control information. The predetermined unit of data transmission may be M1 slots, M1 symbols, or each predetermined transmission unit of data. A common understanding of the feedback resource is achieved between the transmitting device and the receiving device.

[0049] Furthermore, the communication device that transmits the feedback may determine the feedback resource. The transmission of the feedback may be an operation similar to an operation related to data transmission. Note that the communication device that receives the feedback may or may not know the feedback resource. The feedback resource can be flexibly determined.

[0050] The feedback resource may be allocated to the same carrier or cell as the data transmission, or may be allocated to a different carrier or cell than the data transmission. In the time resource for performing feedback, the receiving communication device may or may not perform data reception. In the time resource for performing feedback, the transmitting communication device may or may not perform data transmission.

[0051] The feedback information may be receivable by a communication device other than the communication device that sent the data. Also, the receiving communication device may transmit an ACK using a feedback resource after (for example, immediately after) successfully decoding the data.

[0052] If the receiving communication device is not successful in decoding the data, it may take the following actions 1)-3): The transmitting communication device can know that it needs to continue transmitting data.

[0053] 1) Send a NACK on the feedback resource. 2) Transmit nothing. Figure 12 is a diagram showing an example (6) of repeated transmission in an embodiment of the present invention. In Figure 12, the receiving terminal has not succeeded in decoding the data after receiving five slots, so it does not transmit anything. 3) Information related to the channel state may be transmitted in the feedback resource, such as a Channel Quality Indicator (CQI), Reference Signal Received Power (RSRP), Rank Indicator (RI), Precoding Matrix Indicator (PMI), or resource collision indication.

[0054] The information transmitted in a certain feedback resource may be determined based on the decoding result based on the data received up to a timing preceding the start symbol of the resource by a predetermined time (e.g., the time required for processing), taking into account the processing time on the receiving side.

[0055] The operation when receiving feedback in an embodiment of the present invention will be described below. Figure 13 is a diagram showing an example (7) of repeated transmission in an embodiment of the present invention. As shown in Figure 13, the data transmitting device does not need to transmit data after a predetermined time T1 has elapsed since receiving an ACK. Figure 13 shows an example where T1 is one slot.

[0056] The data transmitting device may continue transmitting data until a predetermined time has elapsed. The data transmission stop may be applied to the resource for which the control information indicated transmission. The data transmission stop may be performed for each predetermined transmission unit, or may be stopped midway through transmission. When executing the data transmission stop, the data transmitting device may transmit information notifying the data receiving device of the transmission stop. The processing time related to feedback reception can be taken into consideration.

[0057] Furthermore, the data transmitting device may transmit a different transport block after a predetermined time T1 has elapsed since receiving the ACK. The data receiving device may assume that the transport block to be transmitted has been changed (NDI has been toggled) without receiving control information.

[0058] Fig. 14 is a diagram showing an example (8) of repeated transmission in an embodiment of the present invention. As shown in Fig. 14, the data transmitting device may change parameters related to data transmission after a predetermined time T2 has elapsed since receiving feedback information, based on the feedback information. The data receiving device may perform a receiving operation assuming that the transmission parameters have been changed after T2 has elapsed. Also, the data receiving device may perform a receiving operation assuming that the transmission parameters have not been changed after T2 has elapsed. The processing time related to feedback reception and parameter change for data transmission can be taken into consideration.

[0059] The parameters related to data transmission after T2 may be preset or may be associated with feedback information. The parameters to be changed may be parameters related to any of the following 1)-6). There may be parameters that are not changed based on the feedback information.

[0060] 1) At least one resource selected from the group consisting of time resources, frequency resources, space resources, and code resources. 2) RS 3) RV 4) MCS 5) Beam 6) Cell or carrier

[0061] T1 may be equal to T2, and T1 <T2であってもよい。

[0062] Fig. 15 is a diagram showing an example (9) of repeated transmission in an embodiment of the present invention. As shown in Fig. 15, an operation for failure to receive ACK may be specified. Fig. 15 shows an example in which data transmission is stopped at the delay limit when ACK is not received. This makes it possible to avoid a case in which data transmission cannot be stopped when ACK reception fails.

[0063] For example, the data transmitting device may terminate transmission or start transmitting another transport block when a predetermined condition is met. The predetermined condition may be, for example, when a predetermined time T3 has elapsed since a timing related to the data transmission (e.g., the start of data transmission). Alternatively, the predetermined condition may be, for example, when the number of data transmissions reaches or exceeds a predetermined number X1. Alternatively, the predetermined condition may be, for example, when a data delay limit (e.g., a maximum packet delay budget) is reached or exceeded.

[0064] For example, when the data transmitting device stops data transmission, it may transmit information notifying the stop of transmission, or may transmit information notifying the transmission of another transport block.

[0065] It should be noted that the above-described embodiments may be applied to any of downlink, uplink, and sidelink, and may also be applied to communication between two or more devices.

[0066] In the above-described embodiment, the names of the channels may be any of PDCCH, PDSCH, PUCCH, PUSCH, PSCCH, PSSCH, and PSFCH, and are not limited to these.

[0067] The above-described embodiment is not limited to communication between base stations and terminals, and the base stations and terminals may have any shape.

[0068] The control information that triggers the start of the repeated transmission may be transmitted by the data receiving device, or the control information may be transmitted in a higher layer.

[0069] According to the above-described embodiment, when reliability is improved by repeated transmission, the communication device can improve delay performance by reducing feedback delay.

[0070] That is, in a wireless communication system, it is possible to reduce delays that occur when repeated transmissions are made.

[0071] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only the functions proposed in any of the embodiments.

[0072] <Base station 10> Fig. 16 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 16, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 16 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0073] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0074] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed. The control unit 140 performs, for example, resource allocation and overall control of the base station 10. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0075] <Terminal 20> Fig. 17 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 17, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 17 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0076] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0077] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Note that the transmitting unit 210 and the receiving unit 220 may be called a transmitter and a receiver, respectively.

[0078] (Hardware configuration) The block diagrams (FIGS. 16 and 17) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0079] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0080] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 18 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0081] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0082] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0083] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0084] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 16 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 17 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0085] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0086] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0087] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0088] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0089] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0090] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0091] (Summary of the embodiment) As described above, according to an embodiment of the present invention, a communication device is provided which has a transmitting unit that transmits control information including at least information related to the transmission of data and the data to another communication device, a control unit that causes the transmitting unit to repeatedly transmit the data without predetermining the time or number of times to end the transmission, and a receiving unit that receives a response corresponding to the data from the other communication device, and the control unit causes the transmitting unit to stop transmitting the data when a specific condition is met.

[0092] With the above configuration, when the communication device improves reliability by repeating transmission, the communication device can improve delay performance by reducing feedback delay, i.e., it is possible to reduce delay when repeating transmission in a wireless communication system.

[0093] The specific condition may be that the receiving unit receives a positive response, that a specific time has elapsed since the start of transmission of the data, or that the number of times the data has been transmitted reaches a specific number. With this configuration, the communication device can reduce feedback delay when improving reliability by repeated transmission.

[0094] The control unit may cause the transmission unit to stop transmitting the data and then start transmitting other data. With this configuration, the communication device can reduce feedback delay when improving reliability by repeated transmission.

[0095] When the control unit stops transmitting the data, the control unit may cause the transmission unit to transmit information notifying the other communication device of the stop of transmission. With this configuration, when the communication device improves reliability by repeated transmission, the communication device can notify the receiving device that repeated transmission will end.

[0096] When the response corresponding to the data is information related to a channel state, the control unit may change parameters related to the transmission of the data based on the information related to the channel state. With this configuration, the communication device can optimize transmission parameters according to the channel state when reliability is improved by repeated transmission.

[0097] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a communication device executes a transmission procedure for transmitting control information including at least information related to the transmission of data and the data to another communication device, a control procedure for causing the transmitting unit to repeatedly transmit the data without predetermining the time or number of times to end the transmission, a receiving procedure for receiving a response corresponding to the data from the other communication device, and a procedure for causing the transmitting unit to stop transmitting the data when certain conditions are met.

[0098] With the above configuration, when the communication device improves reliability by repeating transmission, the communication device can improve delay performance by reducing feedback delay, i.e., it is possible to reduce delay when repeating transmission in a wireless communication system.

[0099] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0100] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0101] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0102] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0103] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0104] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0105] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0106] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0107] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0108] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0109] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0110] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0111] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0112] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0113] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0114] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0115] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of a base station and / or base station subsystem that provides communication service within this coverage.

[0116] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0117] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0118] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0119] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0120] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0121] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0122] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0123] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0124] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0125] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0126] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0127] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0128] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0129] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0130] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0131] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0132] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0133] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0134] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0135] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0136] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0137] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0138] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0139] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0140] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0141] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0142] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0143] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0144] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0145] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0146] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0147] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0148] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0149] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0150] In this disclosure, ACK is an example of an affirmative response.

[0151] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0152] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 30 Core Network 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. a transmitter that transmits control information including at least information related to data transmission and the data to another communication device; a control unit that causes the transmitting unit to repeatedly transmit the data without waiting for a response corresponding to the data, without predetermining a time point or number of times the transmission will be terminated; a receiving unit that receives a response corresponding to the data from the other communication device; The control unit causes the transmission unit to stop transmitting the data when a specific condition is met.

2. 2. The communication device according to claim 1, wherein the specific condition is that the receiving unit receives a positive response, a specific time has elapsed since the start of transmission of the data, or the number of times the data has been transmitted reaches a specific number.

3. The communication device according to claim 2 , wherein the control unit causes the transmission unit to stop transmitting the data and then causes the transmission unit to start transmitting other data.

4. The communication device according to claim 2 , wherein the control unit, when causing the transmission unit to stop transmitting the data, causes the transmission unit to transmit information notifying the other communication device of the stop of transmission.

5. The communication device according to claim 2 , wherein when the response corresponding to the data is information relating to a channel state, the control unit changes a parameter relating to transmission of the data based on the information relating to the channel state.

6. a transmission procedure for transmitting control information including at least information related to data transmission and the data to another communication device; a control procedure for repeatedly transmitting the data without waiting for a response corresponding to the data, without predetermining the time or number of times the transmission is to be terminated; a receiving step of receiving a response corresponding to the data from the other communication device; and a procedure for stopping the transmission of the data when a specific condition is met.

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