Communication device and communication method

Abstract

The present invention provides a communication device including a receiver that receives multiple sets of data using resources autonomously selected by another communication device, a controller that multiplexes sets of feedback information corresponding to the multiple sets of data, and a transmitter that transmits the multiplexed sets of feedback information to the other communication device. The controller determines one or more sets of feedback information to be multiplexed among the sets of feedback information corresponding to the multiple sets of data and multiplexes the sets of feedback information corresponding to the multiple sets of data; or the controller multiplexes the sets of feedback information corresponding to the multiple sets of data on the basis of information that is received by the receiver from the other communication device and related to multiplexing of the sets of feedback information corresponding to the multiple sets of data.

Description

Technical Field

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

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in the wireless section, etc., a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method is referred to as "NR") is being studied. In 5G, in order to meet the requirement of achieving a throughput of 10 Gbps or more and reducing the latency in the wireless section to 1 ms or less, various wireless technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] Furthermore, the study of 6G as the next-generation wireless communication method after 5G has been started, and the realization of wireless quality exceeding 5G is expected. For example, in 6G, studies are being advanced toward realizing further increase in capacity, use of new frequency bands, further reduction in latency, further high reliability, expansion of coverage in new areas (high altitude, sea, space), etc. (for example, Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In 6G, in order to further improve communication speed, capacity, reliability, latency performance, etc., it is assumed that even higher frequencies than before will be used. When using such high frequencies, a wide bandwidth is available, and the radio waves have the characteristics of high directivity and low frequency selectivity. Also, they have the characteristics of large Doppler shift and large path loss.

[0006] Due to the characteristics of the frequency band using such high frequencies, control rules different from those of conventional cell design or base station scheduling techniques may be more desirable from the perspective of network performance. For example, since it is assumed that the probability of resource collision is lower than before, a system in which a terminal or a base station autonomously determines the resources used for transmission can be considered. It is necessary to define a method for the feedback for making a retransmission request in the system.

[0007] The present invention has been made in view of the above points, and an object thereof is to improve transmission quality by implementing feedback for making a retransmission request in a wireless communication system that autonomously determines the resources to be used.

Means for Solving the Problems

[0008] According to the disclosed technology, The communication device a receiving unit that receives a plurality of data at resources autonomously selected by another communication device, a control unit that multiplexes feedback information corresponding to each of the plurality of data, and a transmitting unit that transmits the multiplexed feedback information to the other communication device, The receiving unit receives, from the other communication device, information related to multiplexing of feedback information including a toggled value corresponding to each of the plurality of data. The control unit multiplexes feedback information corresponding to data in which the value included in the corresponding multiplexing-related information has not been toggled until receiving data in which the value included in the corresponding multiplexing-related information is toggled among the plurality of data. The transmitting unit determines to transmit the multiplexed feedback information to the other communication device when receiving data in which the value included in the corresponding multiplexing-related information is toggled among the plurality of data.

Effects of the Invention

[0009] According to the disclosed technology, in a wireless communication system that autonomously determines the resources to be used, it is possible to improve transmission quality by implementing feedback for making a retransmission request.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

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

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

[0013] FIG. 1 is a diagram for explaining 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 includes a base station 10 and a terminal 20. In FIG. 1, one base station 10 and one terminal 20 are shown, but this is an example, and there may be a plurality of each.

[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 the wireless signal are defined in the time domain and the frequency domain. 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. Also, the TTI (Transmission Time Interval) in the time domain may be a slot or a subframe.

[0015] The base station 10 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the terminal 20. In carrier aggregation, one PCell (Primary Cell) and one or more SCell (Secondary Cells) are used.

[0016] The base station 10 transmits synchronization signals, system information, etc. to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH or PDSCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 in the DL (Downlink) and receives control signals or data from the terminal 20 in the UL (Uplink). Here, what is transmitted on control channels such as PUCCH and PDCCH is called a control signal, and what is transmitted on shared channels such as PUSCH and PDSCH is called data, but such a naming method is just an example.

[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, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 in the DL and transmits control signals or data to the base station 10 in the UL, thereby using various communication services provided by the wireless communication system. Note that the terminal 20 may be called a UE, and the base station 10 may be called a gNB.

[0018] The terminal 20 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the base station 10. In carrier aggregation, one PCell (Primary Cell) and one or more SCell (Secondary Cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] FIG. 2 is a diagram for explaining 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 when DC (Dual connectivity) is executed. 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 serving as the MN is called an MCG (Master Cell Group), and a cell group provided by the base station 10B serving as the SN is called an SCG (Secondary Cell Group). Also, 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.

[0021] Note that DC may be a communication method using two communication standards, and any combination of communication standards may be used. For example, the combination may be either NR and 6G standards or LTE and 6G standards. Also, DC may be a communication method using three or more communication standards, and it may be called by another name different from DC.

[0022] The processing operations in the present embodiment may be executed with the system configuration shown in FIG. 1, may be executed with the system configuration shown in FIG. 2, or may be executed with other system configurations other than these.

[0023] Here, in 6G, it is assumed that a higher frequency than before is used for further improvement of communication speed, capacity, reliability, delay performance, etc. When using the high frequency, a wide bandwidth is available, and it has the characteristics of high radio wave directivity and low frequency selectivity. Also, it has the characteristics of a large Doppler shift and a large path loss.

[0024] Due to the characteristics of the frequency band that utilizes such high frequencies, control rules different from those of conventional cell designs or base station scheduling technologies may be more desirable from the perspective of network performance. For example, it is assumed that collision avoidance between DL-DL, DL-UL, and UL-UL, and interference reduction between cells are less necessary for lower frequencies than in the past.

[0025] Figure 3 is a diagram showing an example of scheduling. In the example shown in Figure 3, beamforming of base station 10 is realized analogously, and scheduling by TDM (Time division multiplexing) is executed for each beam. As shown in Figure 3, beam #1 and beam #2 are multiplexed by TDM. In the example shown in Figure 3, base station 10 performs TDM-based scheduling for terminals 20A and 20B that utilize beam #1 and terminal 20C that utilizes beam #2.

[0026] As control rules independent of scheduling, for example, control rule A) and control rule B) shown below can be considered.

[0027] Control rule A): The transmitting device, both the base station 10 and the terminal 20, executes signal transmission at a free timing. The receiving device needs to detect signals at all timings when it can receive, both for the base station 10 and the terminal 20. When a collision of the resources used for transmission occurs, the collision is treated in the same way as a decoding error, and retransmission by feedback may be executed. In a frequency band that utilizes a higher frequency than before, since the beam is very narrow and the area is small, the number of terminals 20 existing within a certain beam is very small, and it is assumed that the probability of collision of the resources used for transmission is low even when scheduling by the base station 10 is not executed.

[0028] Control Rule B) The transmitting device acquires the right of transmission and performs signal transmission for both the base station 10 and the terminal 20. That is, the base station 10 and the terminal 20 perform signal transmission after executing Listen Before Talk (LBT) within the system. The receiving device needs to detect signals at all timings when both the base station 10 and the terminal 20 can receive. Collisions of resources used for transmission are avoided by LBT within the system. In a frequency band using a frequency higher than the conventional one, in addition to a low resource collision probability, Control Rule B can operate to detect in advance resource collisions that rarely occur due to interference within the same beam or between cells and avoid the collisions.

[0029] For both Control Rule A and Control Rule B, cases with frame synchronization and without frame synchronization can be considered. Hereinafter, the control rules in the case of having frame synchronization are referred to as Control Rule A1 or Control Rule B1, and the control rules in the case of not having frame synchronization are referred to as Control Rule A2 or Control Rule B2.

[0030] In the above Control Rule A1, Control Rule A2, Control Rule B1, and Control Rule B2, it is necessary to consider the transmission procedure and the signal detection procedure. Also, in the above Control Rule B1 and the above Control Rule B2, it is necessary to consider LBT within the system. As elements of LBT within the system, it is necessary to consider the transmit available time, semi-static transmission without LBT, and collision avoidance of frequency resources. Also, in the above Control Rule A2 and the above Control Rule B2, it is necessary to consider matters related to the preamble. Also, in the above Control Rule A1 and the above Control Rule B1, it is necessary to consider blind detection of control signals.

[0031] Hereinafter, the transmitting node or the receiving node shall correspond to either the base station 10 or the terminal 20.

[0032] FIG. 4 is a diagram showing an example (1) of transmission and reception in an embodiment of the present invention. Using FIG. 4, the procedure according to the above Control Rule A1 will be described. In the above Control Rule A1, the operations 1)-4) shown below may be executed.

[0033] 1) The transmitting node may transmit a signal at a predetermined transmission timing. The transmitted signal may be composed of at least one of a data signal, a control signal, and a reference signal. The predetermined transmission timing may be determined based on a frame synchronized between the transmitting and receiving nodes.

[0034] 2) When the transmitting node continuously transmits a plurality of signals, the timing of transmissions other than the first transmission may be determined based on the signal transmitted immediately before. For example, the transmission timing and the transmission time length of transmissions other than the first transmission may be instructed to the transmitting node or preset, or may be notified to the receiving node or preset. For example, the transmission timing of transmissions other than the first transmission may be x symbols after the end of the signal transmitted immediately before, or y slots after the end of the signal transmitted immediately before, or z frames after the end of the signal transmitted immediately before, or a combination of x, y, and z. For example, the transmission time length of transmissions other than the first transmission may be L symbol lengths starting from the x-th symbol for each slot.

[0035] In FIG. 4, assuming that the first transmission is executed in slot #0, the transmission in slot #1 is at a transmission timing that is 1 symbol after the end of the signal transmitted immediately before, and an example is shown where the transmission timing and the transmission time length are 7 symbol lengths starting from the 0-th symbol of the slot.

[0036] 3) The receiving node may perform blind detection of the control signal. The resource or detection opportunity of the control signal (for example, CORESET (Control resource set) or search space) may be specified in the specification or set or notified from the transmitting node. For example, in FIG. 4, the receiving node performs blind detection on the control signal transmitted in the first 2 symbols of the slot.

[0037] 4) When the receiving node detects a control signal, it may execute demodulation of the data signal. The receiving node may identify the resources of the data and / or reference signal based on the detection result of the control signal. For example, in FIG. 4, when the receiving node detects a control signal transmitted in the first two symbols at the start of a slot, it may execute demodulation of the subsequent data signal and / or reference signal.

[0038] Note that the correspondence relationship between the transmitting and receiving nodes is as follows. In the downlink, the transmitting node is the base station 10 and the receiving node is the terminal 20. In the uplink, the transmitting node is the terminal 20 and the receiving node is the base station 10. In the sidelink, the transmitting node is the terminal 20 and the receiving node is the terminal 20.

[0039] FIG. 5 is a diagram showing an example (2) of transmission and reception in an embodiment of the present invention. Using FIG. 5, the procedure according to the above control rule A2 will be described. In the above control rule A2, the operations 1)-4) shown below may be executed.

[0040] 1) As shown in FIG. 5, the transmitting node may attach a preamble signal to the transmission signal and transmit it. The transmission signal may be composed of at least one of a data signal, a control signal, and a reference signal. The transmitting node may start transmission at any timing.

[0041] 2) When the transmitting node continuously transmits a plurality of signals, if the gap between the transmission signals is less than or less than a predetermined value, it may not be necessary to attach a preamble signal for transmissions other than the first transmission. The predetermined value may be a threshold value. The transmission timing of signals other than the first transmission may be determined based on the immediately preceding transmission signal. For example, the transmission of the next signal may be started X milliseconds after the end of the immediately preceding transmission signal.

[0042] 3) The receiving node may execute detection of the preamble signal. When the reception power of the preamble signal is greater than or exceeds a predetermined value, the receiving node may determine that the preamble has been detected.

[0043] 4) When the receiving node detects a preamble signal, it may demodulate the transmission signal. The receiving node may identify the resources of the transmission signal based on the detection result of the preamble signal. The receiving node may identify the resources of the control signal or the detection opportunity (e.g., CORESET or search space) based on the detection result of the preamble signal, and may perform blind detection of the control signal. Further, when the receiving node detects the control signal, it may demodulate the data signal. The receiving node may identify the resources of the data and / or reference signal from the detection result of the control signal.

[0044] FIG. 6 is a diagram showing an example (3) of transmission and reception in an embodiment of the present invention. Using FIG. 6, the procedure according to the above control rule B1 will be described. In the above control rule B1, the operations 1)-4) shown below may be executed.

[0045] 1) When the transmitting node succeeds in LBT at a predetermined transmission timing, it may transmit a transmission signal. For example, as shown in FIG. 6, LBT may be executed until immediately before the slot for transmitting the signal. The transmission signal may be composed of at least one of a data signal, a control signal, and a reference signal. The predetermined transmission timing may be determined based on a frame synchronized between the transmitting and receiving nodes. LBT may perform power detection in a predetermined time interval immediately before transmitting the transmission signal, and may determine that it has succeeded when the received power is equal to or less than a predetermined value or less than the predetermined value. The predetermined value may be a threshold value. If LBT fails, LBT may be executed again immediately before the predetermined transmission timing. Alternatively, the timing for repeatedly executing LBT until LBT succeeds may be defined by the specification, or may be set or notified in advance from the receiving node. Note that when the transmitting node performs LBT again and succeeds, it may transmit the same transmission signal as at the time of LBT failure, or may transmit a transmission signal different from that at the time of LBT failure.

[0046] 2) When the transmitting node continuously transmits a plurality of transmission signals, if the gap between the transmission signals is less than or equal to a predetermined value or less than the predetermined value, it may not be necessary to perform LBT except for the first transmission. That is, if the gap between the transmitted signal and the next transmitted signal is less than or equal to a predetermined value or less than the predetermined value, the next transmitted signal may be transmitted without performing LBT. The predetermined value may be a threshold value. When the transmitting node continuously transmits a plurality of transmission signals, if LBT is successful, transmission may be performed without performing LBT for a predetermined period. When continuously transmitting a plurality of transmission signals, the transmission timing of signals other than the first transmission may be determined based on the immediately preceding transmission signal. When continuously transmitting a plurality of transmission signals, the transmission timing and transmission time of signals other than the first transmission may be instructed to the transmitting node, preset, notified to the receiving node, or preset. For example, the transmission timing of transmissions other than the first transmission may be x symbols after the end of the signal transmitted immediately before, y slots after the end of the signal transmitted immediately before, z frames after the end of the signal transmitted immediately before, or a combination of x, y, and z. For example, the transmission time length of transmissions other than the first transmission may be from the x-th symbol per slot to the L-symbol length.

[0047] 3) The receiving node may perform blind detection of the control signal. The resource or detection opportunity of the control signal (e.g., CORESET or search space) may be specified in the specification or set or notified from the transmitting node. For example, in FIG. 6, the receiving node performs blind detection on the control signal transmitted in the first 2 symbols at the start of the slot.

[0048] 4) When the receiving node detects the control signal, it may perform demodulation of the data signal. The receiving node may identify the resources of the data and / or reference signals based on the detection result of the control signal. For example, in FIG. 6, when the receiving node detects the control signal transmitted in the first 2 symbols at the start of the slot, it may perform demodulation of the subsequent data signal and / or reference signal.

[0049] FIG. 7 is a diagram showing an example (4) of transmission and reception in an embodiment of the present invention. The procedure according to the control rule B2 will be described with reference to FIG. 7. In the control rule B2, the operations 1)-4) shown below may be executed.

[0050] 1) When the transmission node succeeds in LBT, it may execute transmission by attaching a preamble signal to the transmission signal. For example, as shown in FIG. 7, LBT may be executed until immediately before transmitting the preamble signal. The transmission signal may be composed of at least one of a data signal, a control signal, and a reference signal. The transmission node may start LBT and transmission at any timing. LBT may perform power detection in a predetermined time interval immediately before transmitting the preamble signal, and may determine that it has succeeded when the received power is less than or less than a predetermined value. The predetermined value may be a threshold value. If LBT fails, LBT may be executed again immediately before any transmission timing. Alternatively, the timing for repeatedly executing LBT until LBT succeeds may be defined by the specification, or may be set or notified in advance from the receiving node. Note that when the transmission node performs LBT again and succeeds, it may transmit the same transmission signal as when LBT fails, or may transmit a transmission signal different from when LBT fails.

[0051] 2) When the transmission node transmits a plurality of signals continuously, if the gap between the transmission signals is less than or less than a predetermined value, it may not be necessary to attach a preamble signal to transmissions other than the first transmission. The predetermined value may be a threshold value. When the transmission node transmits a plurality of signals continuously, if the gap between the transmission signals is less than or less than a predetermined value, it may not be necessary to execute LBT for transmissions other than the first transmission. The predetermined value may be a threshold value. When the transmission node transmits a plurality of transmission signals continuously, if LBT succeeds, it may perform transmission without executing LBT for a predetermined period. When transmitting a plurality of transmission signals continuously, the transmission timing of signals other than the first transmission may be determined based on the immediately preceding transmission signal. For example, the transmission of the next signal may be started X milliseconds after the end of the immediately preceding transmission signal.

[0052] 3) The receiving node may perform detection of the preamble signal. When the received power of the preamble signal is equal to or greater than a predetermined value, the receiving node may determine that the preamble has been detected.

[0053] 4) When the receiving node detects the preamble signal, it may demodulate the transmitted signal. The receiving node may identify the resources of the transmitted signal based on the detection result of the preamble signal. The receiving node may identify the resources of the control signal or the detection opportunity (for example, CORESET or search space) based on the detection result of the preamble signal, and perform blind detection of the control signal. Further, when the receiving node detects the control signal, it may demodulate the data signal. The receiving node may identify the resources of the data and / or reference signal from the detection result of the control signal.

[0054] In the above control rules A1, A2, B1, and B2, it is necessary to consider feedback. For example, it is necessary to study the method for determining the resources used for HARQ (Hybrid Automatic Repeat Request) feedback and the notification method. Also, it is necessary to study the method for multiplexing the information bits of HARQ feedback. Also, it is necessary to study the transmission procedure of HARQ feedback. Also, regarding CSI (Channel State Information) reporting, it is necessary to study the presence or absence of triggering and the triggering method, the definition of the measurement signal, the determination method and the notification method, the determination method of the report content, and the report transmission procedure.

[0055] In a system in which a communication device that receives data, for example, base station 10 or terminal 20, autonomously determines the resources for transmitting data, for example, a system to which the above control rules A1, A2, B1, and B2 are applied, any of the communication devices shown in 1) or 2) below is proposed.

[0056] 1) Transmit data to the communication device and receive a predetermined signal related to the transmitted data 2) Receive data from the communication device and transmit a predetermined signal related to the received data

[0057] In a system in which the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission by the above communication device, the operation of the acknowledgment response for data reception can be clarified. That is, appropriate retransmission can be performed, and improvement in transmission quality can be achieved.

[0058] Note that the predetermined signal related to the transmitted data may be a response indicating the success or failure of reception or decoding corresponding to the transmitted data. Success or failure may be expressed in binary numbers of 0 or 1, or may be other information meaning success or failure. Hereinafter, the information in the above predetermined signal is described as HARQ-ACK, and the operation of transmitting the above predetermined signal is described as HARQ feedback, but it is not limited thereto.

[0059] Note that the predetermined signal related to the received data may be a response indicating the success or failure of reception or decoding corresponding to the received data. Success or failure may be expressed in binary numbers of 0 or 1, or may be other information meaning success or failure. The information may be different between success and failure, and the information for failure may be information related to a retransmission request or instruction. Hereinafter, the information in the above predetermined signal is described as HARQ-ACK, and the operation of transmitting the above predetermined signal is described as HARQ feedback, but it is not limited thereto.

[0060] Note that since the embodiments of the present invention can be applied to any of UL data, DL data, and SL data, hereinafter, the base station 10 or the terminal 20 is also described as, for example, a transmission node, a reception node, or a communication device.

[0061] Note that "resource", "time interval", and "window" may or may not include an LBT interval.

[0062] FIG. 8 is a diagram showing an example (1) of resources for HARQ feedback in an embodiment of the present invention. As shown in FIG. 8, a data transmission node may specify resources for HARQ feedback to a data reception node. In the case of DL, the base station 10 transmits the designation of data and feedback resources to the terminal 20. In the case of UL, the terminal 20 transmits the designation of data and feedback resources to the base station 10. The resources to be designated may be indicated in a predetermined time unit (e.g., a slot), or may be indicated in a predetermined time, frequency, or code unit (e.g., a symbol, a PRB, a cyclic shift, an OCC (Orthogonal Cover Code) index).

[0063] Based on a predetermined timing, the data transmission node may specify a predetermined resource, that is, at least one of time, frequency, code, and space, as a resource for HARQ feedback. For example, the predetermined timing may be a synchronization timing in the control rules A1 and B1, or may be a data transmission timing in the control rules A2 and B2.

[0064] Information regarding resources for HARQ feedback may be shared with other data transmission nodes, or other data transmission nodes may use resources other than the said resources. It may be shared only among terminals 20 associated with the beam of the same base station 10, or information regarding the beam may be shared together among the terminals 20. Information regarding resources for HARQ feedback may be shared with a plurality of nodes by one signal.

[0065] Based on the timing of the beam of the data reception node, the data transmission node may specify a predetermined resource.

[0066] The resource for HARQ feedback may be specified by any of a data signal, a control signal, a reference signal, or a preamble signal (when the above control rules A2 and B2 are applicable). The resource for HARQ feedback may be specified by any of the data signal, control signal, reference signal, or preamble signal (when the above control rules A2 and B2 are applicable) corresponding to the HARQ feedback.

[0067] FIG. 9 is a diagram showing an example (2) of a resource for HARQ feedback in an embodiment of the present invention. As shown in FIG. 9, the data receiving node may transmit HARQ feedback to the data transmitting node using the resource specified by the data transmitting node. The data receiving node may always transmit HARQ feedback to the data transmitting node using the resource specified by the data transmitting node.

[0068] Also, if the resources specified by the data transmission node cannot be used, the data reception node may use other resources to send HARQ feedback to the data transmission node. For example, if there are other scheduled transmissions or receptions at the same time resource as the resource specified by the data transmission node, the data reception node may determine that the specified resource cannot be used. For example, in the above control rule A2 or B2, if it is detected by preamble signal detection and decoding of related signals that at least a part of the resource specified by the data transmission node is used by other nodes, the data reception node may determine that the specified resource cannot be used. For example, in the above control rule A2 or B2, if it is determined by preamble signal detection and decoding of related signals that reception operations are to be performed in at least a part of the resource specified by the data transmission node, and simultaneous reception and transmission cannot be performed, the data reception node may determine that the specified resource cannot be used. For example, if signals of other data transmission nodes are detected by LBT and transmission cannot be performed in the resource specified by the data transmission node, the data reception node may determine that the specified resource cannot be used. Also, the data reception node operates to send HARQ feedback by a predetermined timing, and if HARQ feedback cannot be sent by the predetermined timing, the HARQ feedback may be cancelled.

[0069] The data reception node may autonomously determine resources for HARQ feedback. For example, the resources for HARQ feedback may be any resources. That is, there may be no constraints on the timing of HARQ feedback.

[0070] FIG. 10 is a diagram showing an example (3) of resources for HARQ feedback in an embodiment of the present invention. As shown in FIG. 10, when a data receiving node autonomously determines resources for HARQ feedback, the HARQ feedback may be performed by a predetermined timing Tmax. Tmax may be defined by a specification, determined by a higher layer parameter, determined by a MAC-CE (Media Access Control - Control Element), or determined by a control signal (e.g., DCI (Downlink Control Information) or UCI (Uplink Control Information)) or a preamble signal.

[0071] Tmax may be a different value depending on the case. For example, Tmax may be a different value for each data receiving node, may be a different value depending on the frequency (e.g., band, carrier, cell), may be a different value depending on the service type or requirement (e.g., eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communications)), or may be a different value depending on the priority (e.g., an index indicating priority, a value indicating priority, priority in the PHY layer, priority in the MAC layer). Also, Tmax may be applied based on the timing of a predetermined (e.g., first, last) data reception among the data receptions to be fed back together. Also, Tmax may be determined based on parameters related to LBT. For example, Tmax may be determined based on how much transmission possible timing there is after data reception. The parameters related to LBT may be the time width of LBT or the ability related to LBT in a communication device.

[0072] A resource group for HARQ feedback resources is predefined, and the data receiving node may determine the HARQ feedback resources from among the resource group. The resource group may be TDM or FDM (Frequency division multiplexing) with the data transmission resource group.

[0073] The data transmitting node may notify predetermined resource candidates for HARQ feedback, and the data receiving node may autonomously determine the HARQ feedback resources from among the resource candidates.

[0074] The resource candidate may be a time window for performing HARQ feedback, and the data receiving node may autonomously select the HARQ feedback resources in the time window as described with reference to FIG. 10.

[0075] The resource candidate may be a plurality of time and frequency resources for performing HARQ feedback, and the data receiving node may autonomously select the HARQ feedback resources in the plurality of time and frequency resources as described with reference to FIG. 10.

[0076] The data receiving node may perform HARQ feedback on the resources selected from the resource candidates as described with reference to FIG. 10.

[0077] The resource group for HARQ feedback resources may be predefined or set. The resource group may be set from the base station 10 to the terminal 20, or a common setting may be predefined in the system. The data transmission / reception resources and the HARQ feedback resources may be associated, or the HARQ feedback resources may be determined based on the used data transmission / reception resources. Further, the operations of the transmission / reception nodes described in FIGS. 9 and 10 may be applied.

[0078] The resource group available for data transmission and reception may be defined so as not to overlap with the resource group available for HARQ feedback. The resource group available for HARQ feedback may be TDM or FDM with the resource group for data transmission and reception.

[0079] The data reception node that has received a plurality of data may multiplex HARQ-ACKs for the data with the same resource for corresponding HARQ feedback and transmit them to the data transmission node. The resources being the same may mean that at least one of time, frequency, code, and space is the same resource, or for example, the slots may be the same.

[0080] The data reception node that has received a plurality of data may multiplex HARQ-ACKs for the data received in a predetermined time interval and transmit them to the data transmission node.

[0081] FIG. 11 is a diagram showing an example (1) of multiplexing of HARQ feedback in an embodiment of the present invention. Information related to multiplexing of HARQ feedback is included in a signal related to each data (for example, a corresponding control signal), and the data reception node may multiplex HARQ-ACKs based on the information and transmit them to the data transmission node. The information may be a feedback group instruction. The information may be information used to determine the number of HARQ-ACK bits and the bit positions (hereinafter referred to as information X). Information X may be, for example, DAI (Downlink Assignment Index).

[0082] The information may be toggle information of an indicator related to HARQ feedback, and may also be referred to as NFI (New feedback indicator) or FGI (Feedback grouping indicator). As shown in FIG. 11, the data receiving node may multiplex HARQ-ACK corresponding to data reception related to non-toggled NFI and transmit it to the data transmitting node. When the NFI is toggled, transmission of HARQ feedback corresponding to data reception related to the NFI before being toggled may be triggered. When the NFI is toggled, information X may be initialized.

[0083] When the timing related to the last (i.e., no data is received for a predetermined period thereafter) NFI reception satisfies a predetermined condition, transmission of HARQ feedback corresponding to data reception related to the same (non-toggled) NFI value as the NFI may be triggered. The predetermined condition may be, for example, that a predetermined time has elapsed after the last NFI reception, or the timing may be a predetermined time before the HARQ feedback resource corresponding to the last NFI reception. A signal for indicating the toggle of the NFI may be defined separately, or information indicating toggled / non-toggled for a plurality of nodes may be collectively transmitted by the signal.

[0084] FIG. 12 is a diagram showing an example (2) of multiplexing of HARQ feedback in an embodiment of the present invention. The data receiving node may determine which HARQ-ACKs to multiplex and feedback. The HARQ-ACKs to be multiplexed and transmitted may be determined under constraints based on the reception order of the corresponding data. For example, the data receiving node may be required to include feedback information corresponding to consecutive data receptions starting from the earliest data reception among the data receptions for which feedback has not yet been performed as the multiplexing target for feedback. That is, as shown in FIG. 12, assuming that the feedback information corresponding to the older data receptions is transmitted in order, the data receiving node may determine up to which data reception the feedback information is included.

[0085] When a plurality of data are received in a certain slot (for example, in the case of CA (Carrier Aggregation)), the HARQ-ACK corresponding to the reception of all data in the slot may always be multiplexed. The constraint that the HARQ-ACK corresponding to the reception of all data in the slot must always be multiplexed may be applied only to data with the same priority. The priority may be the priority in either the PHY layer or the upper layer, the priority of the HARQ-ACK, or the priority of the corresponding data. The priority may be associated with the traffic type of the corresponding data reception and the performance requirements (for example, eMBB or URLLC).

[0086] The data reception node may transmit, to the data transmission node, information indicating which data reception the HARQ feedback corresponds to among the received data, together with the HARQ feedback information. For example, when performing K-bit HARQ feedback, the data reception node may transmit, to the data transmission node, information related to the first data reception (for example, slot index) among the data receptions corresponding to the K bits, together with the HARQ feedback information. Also, when performing K-bit HARQ feedback, the data reception node may transmit, to the data transmission node, information indicating that it is K bits, together with the HARQ feedback information.

[0087] The number of HARQ-ACK bits may be determined based on the amount of resources for HARQ feedback. For example, the method related to TBS (Transport Block Size) determination may also be applied to the transmission of control information (for example, UCI, DCI, or HARQ-ACK). For example, the number of HARQ-ACK bits transmitted based on at least one of 1)-3) shown below may be determined.

[0088] 1) Parameters related to MCS (Modulation and Coding scheme). For example, the MCS index. 2) Amount of RS. For example, the amount of DMRS (Demodulation reference signal), PT-RS (Phase tracking reference signal), CSI-RS. 3) Higher layer parameters

[0089] FIG. 13 is a diagram showing an example (3) of multiplexing of HARQ feedback in an embodiment of the present invention. When the number of HARQ-ACK bits corresponding to data reception is not equal to the number of bits of the HARQ feedback to be transmitted, the unused bits may store predetermined information (for example, NACK). For example, as shown in FIG. 13, based on the slot in which HARQ feedback is performed, the mapping of the bit sequence of data reception and HARQ feedback is determined, and among the bit sequences of HARQ feedback, the positions of the unused bits may be determined. For example, bits other than bit #1, bit #2, bit #3, and bit #4 of the HARQ feedback shown in FIG. 13 may store the predetermined information.

[0090] When the data reception node performs HARQ feedback using the resources specified by the data transmission node, the resources of the HARQ feedback used multiplexedly may be determined based on any of the resources for HARQ feedback specified for each data corresponding to the multiplexed HARQ-ACK. For example, based on a notification specifying the resource last received from the data transmission node, the data reception node may determine the resources of the HARQ feedback to be used multiplexedly.

[0091] FIG. 14 is a diagram showing an example (1) of transmission and reception of HARQ feedback in an embodiment of the present invention. The transmission procedure of HARQ feedback may be the same as the transmission procedure of data. That is, a data signal, a control signal, a reference signal, and a preamble signal (when the above control rules A2 and B2 are applied) are the transmission procedures of data transmission. As shown in FIG. 14, HARQ feedback may be transmitted instead of the data signal, and a HARQ feedback signal, a control signal, a reference signal, and a preamble signal may be transmitted. Further, when the above control rules B1 and B2 are applied, LBT may be executed before signal transmission.

[0092] FIG. 15 is a diagram showing an example (2) of transmission and reception of HARQ feedback in an embodiment of the present invention. The transmission procedure of HARQ feedback may be different from the data transmission procedure. That is, a signal for HARQ feedback may be defined. As shown in FIG. 15, a signal for HARQ feedback and a preamble signal (when the above control rules A2 and B2 are applied) may be transmitted in a specified resource without a control signal for reception. Further, when the above control rules B1 and B2 are applied, LBT may not be executed before signal transmission. For example, it may be assumed that other nodes do not use the HARQ feedback resource notified by the signal related to the corresponding data transmission. Further, for example, when there is a transmission from the data transmission node or the data reception node continuously or within a predetermined time gap before the HARQ feedback resource, LBT may not be performed.

[0093] The data transmission node may assume that HARQ feedback is transmitted from the data reception node in the specified HARQ feedback resource. Further, the data transmission node may assume that HARQ feedback is transmitted by a predetermined timing. The predetermined timing may be a timing based on Tmax described above.

[0094] The data transmission node may assume that when a predetermined condition is satisfied, HARQ feedback is transmitted from the data reception node on the designated HARQ feedback resource. Also, the data transmission node may assume that when a predetermined condition is satisfied, HARQ feedback is transmitted by a predetermined timing.

[0095] When the data transmission node is reported a failure in data reception or decoding, or cannot receive HARQ feedback (e.g., by a predetermined timing), it may retransmit the corresponding data. The retransmission of data may be executed in the same manner as the first transmission. That is, a data signal, a control signal, a reference signal, and a preamble signal (when the above control rules A2 and B2 are applied) may be transmitted from the data transmission node, or HARQ-ACK information may be transmitted from the data reception node instead of the data. Further, in the case of the above control rules B1 and B2, LBT may be performed before signal transmission.

[0096] Also, the retransmission of data may be performed in a manner different from the first transmission. That is, a method for data retransmission may be defined. For example, as information related to HARQ feedback, a resource for data retransmission may be notified from the data reception node to the data transmission node. When retransmitting data using the notified resource, a data signal, a reference signal, and a preamble signal (when the above control rules A2 and B2 are applied) may be transmitted from the data transmission node without control information for reception. Also, for example, when retransmitting data using a resource other than the notified resource, the retransmission of data may be executed in the same manner as the first transmission. Further, in the case of the above control rules B1 and B2, LBT may be performed before signal transmission.

[0097] Also, when the data transmission node cannot receive HARQ feedback (e.g., by a predetermined timing), it may request the data reception node to retransmit the HARQ feedback.

[0098] According to the above-described embodiments, in a system where the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission, it is possible to clarify the acknowledgment response, retransmission request, and retransmission operation for data reception.

[0099] That is, in a wireless communication system that autonomously determines the resources to be used, it is possible to implement feedback for making a retransmission request to improve the transmission quality.

[0100] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. 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 be provided with only the functions of any one of the proposals in the embodiments.

[0101] <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 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 16 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be any. The transmission unit 110 and the reception unit 120 may be referred to as a communication unit.

[0102] The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The reception unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining, from the received signals, information of, for example, a higher layer. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. Further, the transmission unit 110 transmits the setting information and the like described in the embodiments.

[0103] The setting unit 130 stores the preset setting information and various setting information to be transmitted to the terminal 20 in the storage device, and reads it out from the storage device as needed. The control unit 140 performs control of the entire base station 10 including, for example, control related to signal transmission and reception and control related to LBT. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. Also, the transmission unit 110 and the reception unit 120 may be referred to as a transmitter and a receiver, respectively.

[0104] <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 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 17 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be any. The transmission unit 210 and the reception unit 220 may be referred to as a communication unit.

[0105] The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The reception unit 220 wirelessly receives various signals and acquires signals of a higher layer from the received physical layer signals. Also, the transmission unit 210 transmits HARQ-ACK, and the reception unit 220 receives the setting information and the like described in the embodiments.

[0106] The setting unit 230 stores the various setting information received from the base station 10 by the reception unit 220 in the storage device, and reads it out from the storage device as needed. Also, the setting unit 230 stores the preset setting information. The control unit 240 performs control of the entire terminal 20 including control related to signal transmission and reception and control related to LBT. Note that the functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the reception unit 220. Also, the transmission unit 210 and the reception unit 220 may be referred to as a transmitter and a receiver, respectively.

[0107] (Hardware Configuration) The block diagrams (Figs. 16 and 17) used in the description of the above embodiments show blocks of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0108] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit is called a transmitting unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0109] For example, the base station 10, the terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 18 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The above base station 10 and terminal 20 may physically be 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.

[0110] In the following description, the term "apparatus" can be read as a circuit, device, unit, etc. The hardware configurations of the base station 10 and the terminal 20 may be configured to include one or more of each apparatus shown in the figure, or may be configured without including some apparatuses.

[0111] Each function in the base station 10 and the terminal 20 is realized by loading a predetermined software (program) onto hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs operations and controls communication by the communication device 1004, or controls at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0112] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, the above-described control units 140, 240, etc. may be realized by the processor 1001.

[0113] Also, the processor 1001 reads a program (program code), software module, 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 according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 16 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 17 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Although it has been described that the above various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0114] The storage device 1002 is a computer-readable recording medium, and may be constituted by at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, cache, main memory (main storage device), etc. The storage device 1002 can store a program (program code), software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0115] The auxiliary storage device 1003 is a computer-readable recording medium, and may be constituted by, 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 (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-described storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0116] The communication device 1004 is hardware (a transmission / reception device) for performing communication 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, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transmission / reception antenna, an amplifier section, a transmission / reception section, a transmission line interface, etc. may be realized by the communication device 1004. The transmission / reception section may be physically or logically separated into a transmission section and a reception section.

[0117] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0118] Also, 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 for each device.

[0119] Also, the base station 10 and the 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, the processor 1001 may be implemented using at least one of these hardware components.

[0120] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there is provided a communication device including: a receiving unit that receives a plurality of data at a resource autonomously selected by another communication device; a control unit that multiplexes feedback information corresponding to each of the plurality of data; and a transmitting unit that transmits the multiplexed feedback information to the other communication device, wherein the control unit determines which of the feedback information corresponding to each of the plurality of data is to be multiplexed, and multiplexes the feedback information corresponding to each of the plurality of data, or the control unit multiplexes the feedback information corresponding to each of the plurality of data based on information related to multiplexing of the feedback information corresponding to each of the plurality of data received by the receiving unit from the other communication device.

[0121] In the system where the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission according to the above configuration, it is possible to clarify the acknowledgment response, retransmission request, and retransmission operation for data reception. That is, in a wireless communication system that autonomously determines the resources to be used, it is possible to improve the transmission quality by performing feedback for retransmission requests.

[0122] The control unit may multiplex the feedback corresponding to the data in which the value included in the information related to the corresponding multiplexing has not toggled until it receives the data in which the value included in the information related to the corresponding multiplexing among the plurality of data toggles. With this configuration, in the system where the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission, it is possible to multiplex and transmit the feedback corresponding to data reception.

[0123] When the transmission unit receives the data in which the value included in the information related to the corresponding multiplexing among the plurality of data toggles, it may determine to transmit the multiplexed feedback to the other communication device. With this configuration, in the system where the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission, it is possible to multiplex and transmit the feedback corresponding to data reception.

[0124] The transmission unit may transmit information indicating which data the feedback corresponds to among the plurality of data to the other communication device together with the multiplexed feedback. With this configuration, in the system where the base station 10 or the terminal 20 autonomously selects resources for DL, UL, or SL transmission, it is possible to multiplex and transmit the feedback corresponding to data reception.

[0125] According to an embodiment of the present invention, a communication device executes a reception procedure for receiving a plurality of data in a resource autonomously selected by another communication device, a control procedure for multiplexing feedback information corresponding to each of the plurality of data, and a transmission procedure for transmitting the multiplexed feedback information to the other communication device. Further, the communication device determines which of the feedback information corresponding to each of the plurality of data is to be multiplexed, and executes a procedure for multiplexing the feedback information corresponding to each of the plurality of data, or a procedure for multiplexing the feedback information corresponding to each of the plurality of data based on information related to the multiplexing of the feedback information corresponding to each of the plurality of data received from the other communication device. A communication method is provided.

[0126] With the above configuration, in a system where the base station 10 or the terminal 20 autonomously selects a resource for DL, UL, or SL transmission, it is possible to clarify an acknowledgment response, a retransmission request, and a retransmission operation for data reception. That is, in a wireless communication system that autonomously determines the resources to be used, it is possible to improve the transmission quality by performing feedback for making a retransmission request.

[0127] (Supplement of the embodiment) The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating understanding of the invention, unless otherwise specified, those numerical values are merely examples and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, or matters described in one item may be applied to matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of multiple functional units may be physically performed by one component, or conversely, the operation of one functional unit may be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operating on the processor included in the base station 10 according to the embodiments of the present invention and the software operating on the processor included in the terminal 20 according to the embodiments of the present invention may be stored in a random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium, respectively.

[0128] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals or combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0129] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), 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), other suitable systems, and next-generation systems extended based thereon. Also, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0130] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be rearranged as long as there is no contradiction. For example, for the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0131] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, various operations performed for communication with the terminal 20 can clearly be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0132] The information or signals, etc. described in the present disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0133] The input and output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0134] The determination in the present disclosure may be made based on a value represented by 1 bit (0 or 1), may be made based on a Boolean value (true or false), or may be made based on a numerical comparison (for example, comparison with a predetermined value).

[0135] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, hardware description language, or by any other name.

[0136] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, fiber optic cables, twisted pairs, digital subscriber line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0137] 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., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0138] Note that terms described 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). Also, a signal may be a message. Also, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0139] The terms "system" and "network" used in this disclosure are used interchangeably.

[0140] In addition, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or another corresponding piece of information. For example, radio resources may be indicated by an index.

[0141] The names used for the above-described parameters are not limiting in any way. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting in any way.

[0142] In this disclosure, terms such as "base station (BS: Base Station)", "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", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0143] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each of the smaller areas can also provide communication services 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 whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0144] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0145] 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 terms.

[0146] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does 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.

[0147] Also, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station 10 described above may be configured to be functions of the terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0148] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the user terminal described above may be configured to be functions of the base station.

[0149] As used herein, the terms "determining" and "determination" may encompass a wide variety of operations. "Determining" and "determination" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "determined". "Determining" and "determination" may also include considering something as having been "determined" or "determined" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and the like. "Determining" and "determination" may further include considering something as having been "determined" or "determined" based on resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "determination" may include considering something as having been "determined" or "determined" based on performing some operation. Also, "determining (determination)" may be read as "assuming", "expecting", "considering", etc.

[0150] The terms "connected" or "coupled," or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can 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 can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed." As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as, by way of some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0151] The reference signal can also be abbreviated as RS (Reference Signal) and may be referred to as a Pilot depending on the applicable standard.

[0152] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least in part on."

[0153] Any reference to an element using the designations "first," "second," etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any way.

[0154] In the configuration of each of the above devices, the "means" can be replaced with a "section," "circuit," "device," etc.

[0155] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0156] The wireless 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. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0157] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0158] The slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. The slot may be a time unit based on numerology.

[0159] A slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0160] A radio frame, sub-frame, slot, mini-slot, and symbol all represent time units for transmitting signals. Different names corresponding to each of them may be used.

[0161] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be a sub-frame (1 ms) in the existing LTE, or 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, mini-slot, etc. instead of a sub-frame.

[0162] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of the TTI is not limited to this.

[0163] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling and link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0164] When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slot numbers) constituting the minimum time unit for the scheduling may be controlled.

[0165] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0166] Note that the long TTI (e.g., the normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and the short TTI (e.g., the shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0167] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or a plurality of consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0168] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0169] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0170] Also, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0171] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0172] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For the terminal 20, one or more BWPs may be set within one carrier.

[0173] At least one of the set BWPs may be active, and the terminal 20 may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0174] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0175] In the present disclosure, for example, when articles are added by translation like a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0176] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are different from C respectively". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0177] In the present disclosure, each aspect / embodiment described may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0178] Note that in the present disclosure, the base station 10 and the terminal 20, or the transmission node and the reception node are an example of a communication device.

[0179] Although the present disclosure has been described in detail above, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modified and changed aspects without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and has no restrictive meaning for the present disclosure.

Explanation of Signs

[0180] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 30 Core network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that receives a plurality of data at a resource autonomously selected by another communication device; A control unit that multiplexes feedback information corresponding to each of the plurality of data; A transmission unit that transmits the multiplexed feedback information to the other communication device, wherein the receiving unit receives, from the other communication device, information related to multiplexing of feedback information including a toggled value corresponding to each of the plurality of data, the control unit multiplexes feedback information corresponding to data for which the value included in the corresponding information related to multiplexing has not been toggled until receiving data for which the value included in the corresponding information related to multiplexing is toggled among the plurality of data, and the transmission unit determines to transmit the multiplexed feedback information to the other communication device when receiving data for which the value included in the corresponding information related to multiplexing is toggled among the plurality of data. A communication device.

2. The communication device according to claim 1, wherein the transmission unit transmits, to the other communication device, information indicating which data among the plurality of data the feedback information corresponds to, together with the multiplexed feedback information.

3. The communication device according to claim 1 or 2, wherein the control unit determines the number of bits of the multiplexed feedback information based on a parameter related to a resource of the feedback information.

4. A receiving procedure for receiving a plurality of data at a resource autonomously selected by another communication device; A control procedure for multiplexing feedback information corresponding to each of the plurality of data; A transmission procedure for transmitting the multiplexed feedback information to the other communication device; A procedure for receiving, from the other communication device, information related to multiplexing of feedback information including a toggled value corresponding to each of the plurality of data; A procedure for multiplexing feedback information corresponding to data for which the value included in the corresponding information related to multiplexing has not been toggled until receiving data for which the value included in the corresponding information related to multiplexing is toggled among the plurality of data; A communication method in which a communication device executes a procedure for determining to transmit the multiplexed feedback information to the other communication device when receiving data for which the value included in the corresponding information related to multiplexing is toggled among the plurality of data.

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