Terminals and communication methods

Abstract

Provided is a terminal comprising: a reception unit which receives a control channel or a shared channel from another terminal in an unlicensed band; a control unit which determines that feedback corresponding to the control channel or to the shared channel is to be transmitted to the other terminal on the shared channel; and a transmission unit which transmits the feedback on the shared channel in accordance with the determination.

Description

Technical Field

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

Background Art

[0002] In LTE (Long Term Evolution) and successor systems of LTE (for example, LTE-A (LTE Advanced), NR (New Radio) (also referred to as 5G)), D2D (Device to Device) technology in which terminals communicate directly without going through a base station has been studied (for example, Non-Patent Document 1).

[0003] D2D reduces traffic between a terminal and a base station, and enables communication between terminals even when the base station becomes incommunicable during a disaster or the like. In 3GPP (3rd Generation Partnership Project), D2D is referred to as "sidelink", but in this specification, the more general term D2D is used. However, sidelink is also used as necessary in the description of the embodiments described later.

[0004] D2D communication is roughly classified into D2D discovery (also referred to as D2D discovery) for discovering other communicable terminals and D2D communication (also referred to as D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between terminals. Hereinafter, when not particularly distinguishing D2D communication, D2D discovery, etc., it is simply referred to as D2D. Also, a signal transmitted and received by D2D is referred to as a D2D signal. Various use cases of services related to V2X (Vehicle to Everything) in NR have been studied.

[0005] Furthermore, NR Release 17 explores the use of higher frequency bands than those described in previous releases (e.g., Non-Patent Document 2). For example, it examines applicable neurology, including subcarrier spacing and channel bandwidth, physical layer design, and anticipated interferences in actual wireless communication in the frequency band from 52.6 GHz to 71 GHz. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] 3GPP TS 38.211 V16.6.0(2021-06) [Non-Patent Document 2] 3GPP TS 38.306 V16.5.0(2021-06) [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] In frequency bands using higher frequencies than conventional ones, an unlicensed band is defined. Various regulations are defined in the unlicensed band; for example, LBT (Listen before talk) must be implemented when accessing a channel. When performing D2D communication in this higher frequency band, operation that conforms to the regulations of the unlicensed band is required.

[0008] This invention has been made in view of the above points, and aims to realize direct terminal-to-terminal communication that is highly compliant with regulations. [Means for solving the problem]

[0009] According to the disclosed technology, in the unlicensed band, the system includes: a receiving unit that receives a control channel or a shared channel from another terminal; a control unit that decides to transmit feedback corresponding to the control channel or the shared channel to the other terminal via the shared channel; and a transmitting unit that transmits the feedback via the shared channel in accordance with the decision. The control unit decides to transmit the feedback to the other terminal via the shared channel when predetermined conditions are met, and the terminal transmits the feedback using the shared channel after a predetermined time has elapsed since the previous transmission of feedback using the shared channel. A device will be provided. [Effects of the Invention]

[0010] The disclosed technology provides a method for enabling highly compliant direct terminal-to-terminal communication. [Brief explanation of the drawing]

[0011] [Figure 1] This is a diagram to explain V2X. [Figure 2] This figure shows an example of a frequency range in an embodiment of the present invention. [Figure 3] This is the first diagram to explain HARQ feedback. [Figure 4] This is the second diagram to explain HARQ feedback. [Figure 5] This is the third diagram to explain HARQ feedback. [Figure 6] This is the fourth figure to explain HARQ feedback. [Figure 7] This is a diagram illustrating a terminal in an embodiment of the present invention. [Figure 8] This flowchart shows an example of the transmission and reception processing flow of a terminal in an embodiment of the present invention. [Figure 9] This figure shows an example of the functional configuration of a terminal in an embodiment of the present invention. [Figure 10] This figure shows an example of the hardware configuration of a terminal in an embodiment of the present invention. [Figure 11] This figure shows an example of the vehicle configuration in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0013] 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 technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and subsequent systems (e.g., NR) unless otherwise specified.

[0014] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc. used in existing LTE are used. This is for convenience of description, and signals, functions, etc. similar to these may be called by other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even for signals used in NR, it is not always necessary to specify "NR-".

[0015] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0016] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters, etc., may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from a base station or terminal are configured.

[0017] Figure 1 is a diagram illustrating V2X. 3GPP is considering and working on specifications to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality. As shown in Figure 1, V2X is a part of ITS (Intelligent Transport Systems) and is a general term encompassing V2V (Vehicle to Vehicle), which refers to communication between vehicles; V2I (Vehicle to Infrastructure), which refers to communication between vehicles and roadside units (RSUs) installed along the roadside; V2N (Vehicle to Network), which refers to communication between vehicles and ITS servers; and V2P (Vehicle to Pedestrian), which refers to communication between vehicles and mobile terminals carried by pedestrians.

[0018] Furthermore, 3GPP is considering V2X using LTE or NR cellular communication and terminal-to-terminal communication. V2X using cellular communication is also called cellular V2X. For NR V2X, research is underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0019] Regarding LTE or NR V2X, it is anticipated that future considerations will extend beyond 3GPP specifications. For example, it is expected that considerations will be given to ensuring interoperability, reducing costs through the implementation of higher layers, methods for using or switching between multiple RATs (Radio Access Technologies), compliance with regulations in various countries, and methods for data acquisition, distribution, database management, and utilization of LTE or NR V2X platforms.

[0020] While the embodiments of the present invention primarily envision a configuration in which the communication device is mounted on a vehicle, the embodiments of the present invention are not limited to this configuration. For example, the communication device may be a terminal held by a person, a device mounted on a drone or aircraft, or a base station, RSU, relay station (relay node), terminal with scheduling capabilities, etc.

[0021] Furthermore, SL (Sidelink) may be distinguished from UL (Uplink) or DL ​​(Downlink) based on any one or a combination of the following 1)-4). Also, SL may have other names. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Reference synchronization signals (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmit power control

[0022] Furthermore, with respect to SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of the following may be applied: CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform - Spread - OFDM), OFDM without transform precoding, or OFDM with transform precoding.

[0023] In LTE's Downlink Service (SL), Mode 3 and Mode 4 are defined for allocating SL resources to terminals. In Mode 3, transmission resources are dynamically allocated based on DCI (Downlink Control Information) sent from the base station to the terminal. Semi-Persistent Scheduling (SPS) is also possible in Mode 3. In Mode 4, the terminal autonomously selects transmission resources from the resource pool.

[0024] In the embodiments of the present invention, the term "slot" may be interpreted as a symbol, mini-slot, subframe, wireless frame, or TTI (Transmission Time Interval). Furthermore, in the embodiments of the present invention, the term "cell" may be interpreted as a cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.

[0025] In the embodiments of the present invention, the terminal is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication. For example, the terminal may be a user-owned device such as a smartphone, or an IoT (Internet of Things) device such as a smart meter.

[0026] 3GPP Release 16 or Release 17 sidelinks are specified for the following: 1) and 2)

[0027] 1) An environment where only 3GPP terminals exist in the ITS (Intelligent Transport Systems) band. 2) An environment that makes UL resources available to SL in the FR1 (Frequency range 1) and FR2 license bands defined in NR.

[0028] As a sidelink for 3GPP Release 18 and later, the inclusion of unlicensed bands is being considered. Examples include unlicensed bands such as the 5GHz-7GHz band and the 60GHz band.

[0029] Figure 2 shows an example of frequency ranges in an embodiment of the present invention. The NR specification of 3GPP Release 17 considers operating in frequency bands above 52.6 GHz, for example. As shown in Figure 2, the currently defined FR1 frequency band is from 410 MHz to 7.125 GHz, with a Subcarrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth of 5 MHz to 100 MHz. FR2 is a frequency band from 24.25 GHz to 52.6 GHz, using an SCS of 60, 120, or 240 kHz and a bandwidth of 50 MHz to 400 MHz. For example, the newly operated frequency band may be from 52.6 GHz to 71 GHz.

[0030] For example, unlicensed bands in the 5GHz-7GHz range could include 5.15GHz to 5.35GHz, 5.47GHz to 5.725GHz, and above 5.925GHz.

[0031] For example, unlicensed bands in the 60GHz band could include those from 59GHz to 66GHz, from 57GHz to 64GHz or 66GHz, and from 59.4GHz to 62.9GHz.

[0032] In unlicensed bands, various regulations are in place to prevent interference with other systems or equipment.

[0033] For example, in the 5GHz-7GHz band, Listen Before Talk (LBT) is performed when accessing a channel. The base station or terminal performs power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if transmission from another device is detected, transmission is stopped. A Maximum Channel Occupancy Time (MCOT) is also specified. MCOT is the maximum time interval during which transmission is allowed to continue if transmission starts after LBT, and in Japan, for example, it is 4ms. Furthermore, as an Occupied Channel Bandwidth (OCB) requirement, when transmitting using a certain carrier bandwidth, at least X% of that bandwidth must be used. For example, in Europe, it is required to use 80% to 100% of the Nominal Channel Bandwidth (NCB). The OCB requirement aims to ensure that power detection for channel access is performed correctly. In addition, regarding maximum transmit power and maximum power spectral density, it is stipulated that transmission must be performed at or below a specified transmit power. For example, in Europe, the maximum transmit power is 23 dBm in the 5150 MHz-5350 MHz band. Also, in Europe, the maximum power spectral density is 10 dBm / MHz in the 5150 MHz-5350 MHz band.

[0034] Furthermore, various regulations are also specified for the 60GHz band. For example, LBT (Low-Level Testing) is performed when accessing a channel. The base station or terminal performs power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if it detects transmission from another device, it stops transmitting. In addition, it is stipulated that transmission must be performed at or below a predetermined transmit power and maximum power spectral density. It is also stipulated that the device must have the capability to meet OCB (Overclocking Control) requirements.

[0035] Figure 3 is the first diagram illustrating HARQ feedback. Sidelink in 3GPP Releases 16 and 17 specifies HARQ feedback functionality via the PSFCH (Physical Sidelink Feedback Channel).

[0036] HARQ feedback is introduced to improve QoS, reliability, and spectral efficiency. HARQ feedback for unicast or groupcast can be enabled or disabled through (pre)configuration and SCI. Additionally, HARQ-ACKs are reported in PSFCH, and the time-domain resources used are determined by (pre)configuration.

[0037] For example, a PSFCH resource is defined for every N slots, where N is set to one of 1, 2, or 4. The shortest offset from data reception to feedback transmission is defined as K slots, where K is set to one of 2 or 3. In this case, the actual offset is the smallest integer value with a length greater than or equal to the defined K.

[0038] PSFCH transmits only one HARQ-ACK bit; therefore, multiplexing of multiple HARQ-ACK bits in a PSFCH resource is not supported.

[0039] Figure 4 is a second diagram illustrating the HARQ feedback. The slot index "s" and the subchannel start index "n" are associated with a set of PSFCH resource candidates, which are defined by the number of physical resource blocks Z and the number of cyclic shift pairs Y for each resource block.

[0040] Figure 5 is a third diagram illustrating the HARQ feedback. The cyclic shift is selected according to Y. cs And, M0 is selected depending on whether the HARQ-ACK response is negative (NACK) or positive (ACK), csSet to +M0. For Z physical resource blocks, the slots are prioritized over the subchannels. Also, between the Z physical resource blocks and the Y cyclic shift pairs, the physical resource blocks are indexed with priority over the physical resource blocks.

[0041] The index for the PSFCH resource is (P ID +M ID It is determined as )mod(Z*Y). Here, P ID This is the source ID. ID This value is 0 for Unicast / Groupcast option 1, and the Member ID for Groupcast option 2.

[0042] Figure 6 is the fourth diagram illustrating HARQ feedback. PSFCH resources use P to avoid collisions with other terminals. ID It depends on this. A sending terminal may select the same sending resource when multiple receiving terminals are in close proximity to each other.

[0043] (Summary of this embodiment) In sidelinks, PSFCH transmission failures may occur frequently. In the unlicensed bands mentioned above, LBT failures and hidden terminal problems may occur in the unlicensed spectrum. Therefore, this embodiment describes a method for achieving stable HARQ feedback in sidelinks. The following description uses unlicensed bands as an example, but the technology according to this embodiment is also applicable to frequency bands other than unlicensed bands.

[0044] Figure 7 is a diagram illustrating a terminal in an embodiment of the present invention. In the following description, the first terminal 20A is a terminal that transmits data. The second terminal 20B is a terminal that receives data and transmits a HARQ-ACK indicating the reception result to the first terminal 10A.

[0045] Figure 8 is a flowchart illustrating an example of the transmission and reception process flow of a terminal in an embodiment of the present invention. The first terminal 20A transmits data to the second terminal 20B (step S1). The second terminal 20B receives the data and transmits a HARQ feedback response (HARQ-ACK) indicating the reception result to the first terminal 10A (step S2).

[0046] In step S2, the second terminal 20B transmits a HARQ-ACK via the Physical Sidelink Shared Channel (PSSCH).

[0047] Examples 1 to 4 of the present invention will be described below as examples of embodiments of the present invention.

[0048] (Example 1) Example 1 describes how to determine the HARQ-ACK information to be transmitted.

[0049] <Option 1> The second terminal 20B may transmit HARQ-ACK information for all HARQ processes. This may be done in a similar manner to the type-3 HARQ-ACK CB in HARQ uplink transmission.

[0050] <Option 2> The second terminal 20B may transmit HARQ-ACK information based on instructions from the first terminal 20A.

[0051] <Option 3> The second terminal 20B may transmit HARQ-ACK information relating to the PSCCH / PSSCH corresponding to the PSSCH that transmits HARQ-ACK information. That is, there may be an association between the PSCCH / PSSCH transmitted from the first terminal 20A and the PSSCH for HARQ feedback transmitted by the second terminal 20B.

[0052] <Option 4> The second terminal 20B may generate a HARQ-ACK bit for the potential PSCCH / PSSCH reception within a predetermined time interval. This may be done in a similar manner to the type-1 HARQ-ACK CB in HARQ uplink transmission.

[0053] Specifically, when the second terminal 20B transmits HARQ-ACK information from slot n to slot n+K, and the number of subchannels is M, it may transmit K*M pieces of HARQ-ACK information. That is, the second terminal 20B may generate 1 bit of HARQ-ACK information for each slot / subchannel and store the corresponding affirmative (ACK) or negative (NACK) for the slot / subchannel in which PSCCH (and PSSCH) was actually received.

[0054] Furthermore, when the second terminal 20B transmits HARQ-ACK information from slot n to slot n+K, and the number of subchannels is M, it may transmit K pieces of HARQ-ACK information. That is, the second terminal 20B may generate 1 bit of HARQ-ACK information for each slot and store the corresponding affirmative (ACK) or negative (NACK) for the slot in which PSCCH (and PSSCH) was actually received.

[0055] The second terminal 20B may generate HARQ-ACK information indicating either an affirmative (ACK) or negative (NACK) only for PSCCH / PSSCH transmitted from the first terminal 20A, and may generate HARQ-ACK information indicating a negative (NACK) for PSCCH / PSSCH transmitted from terminals other than the first terminal 20A, and when PSCCH / PSSCH is not received.

[0056] According to the method for determining HARQ-ACK information in this embodiment, the HARQ-ACK information to be transmitted can be uniquely determined, thus enabling a common understanding between the first terminal 20A and the second terminal 20B.

[0057] (Example 2) Example 2 describes a method for transmitting HARQ-ACK information.

[0058] <Option 1> The second terminal 20B may transmit HARQ-ACK information via MAC-CE. The priority of the MAC-CE may be higher, the same as, or lower than that of SCCH. The priority of the MAC-CE may also be higher, the same as, or lower than that of the sidelink CSI reporting the MAC-CE.

[0059] <Option 2> The second terminal 20B may multiplex the HARQ-ACK information as a physical layer signal to the PSSCH and transmit it. For example, the second terminal 20B may multiplex the HARQ-ACK information using rate-matching with the same mapping method after mapping the second-stage SCI. Alternatively, the second terminal 20B may multiplex data to the remaining resources after mapping the HARQ-ACK information.

[0060] According to the HARQ-ACK information transmission method of this embodiment, HARQ-ACK information can be transmitted by an appropriate method such as PSSCH.

[0061] (Example 3) Example 3 describes a method for triggering HARQ-ACK information.

[0062] <Option 1> The first terminal 20A may request the second terminal 20B to send HARQ-ACK information via SCI using PSSCH.

[0063] <Option 2> The second terminal 20B may autonomously transmit HARQ-ACK information via PSSCH.

[0064] <Option 3> The second terminal 20B may transmit HARQ-ACK information via PSSCH if certain conditions are met.

[0065] For example, the second terminal 20B may transmit HARQ-ACK information via PSSCH after a predetermined time has elapsed since the previous transmission of HARQ-ACK information via PSSCH.

[0066] Furthermore, the second terminal 20B may transmit HARQ-ACK information via PSSCH after receiving a predetermined number of PSCCH / PSSCH signals from the first terminal 20A, or after receiving a predetermined number of transport blocks.

[0067] <Option 4> The second terminal 20B may be configured to use either PSSCH or PSFCH to transmit HARQ-ACK information.

[0068] For example, the second terminal 20B may be configured to transmit HARQ-ACK information using both PSSCH and PSFCH.

[0069] Furthermore, the second terminal 20B may autonomously decide whether to transmit the HARQ-ACK information via PSSCH or PSFCH, and transmit the HARQ-ACK information using either the PSSCH or PSFCH method determined by the terminal.

[0070] The first terminal 20A may request or notify the second terminal 20B whether to transmit the HARQ-ACK information in PSSCH or PSFCH. The second terminal 20B transmits the HARQ-ACK information in either PSSCH or PSFCH in response to the request or notification.

[0071] The second terminal 20B may notify the first terminal 20A of its terminal capability, indicating whether the HARQ-ACK information transmission channel supports PSSCH or PSFCH. In that case, the first terminal 20A may, based on the notified terminal capability, explicitly specify and request a transmission method, or assume that HARQ feedback will be performed using the corresponding transmission method.

[0072] Furthermore, the SCI bit for notification related to the transmission of HARQ-ACK information on the PSSCH may be defined separately from the "HARQ feedback enabled / disabled indicator" field, for example, in the "HARQ feedback enabled / disabled indicator on PSSCH" field. In this case, the "HARQ feedback enabled / disabled indicator" field and the "HARQ feedback enabled / disabled indicator on PSSCH" field may each contain 1 bit of information.

[0073] Furthermore, notification regarding the transmission of HARQ-ACK information via PSSCH may be made in the "HARQ feedback enabled / disabled indicator" field of the SCI. In this case, the "HARQ feedback enabled / disabled indicator" field may contain 2 bits of information. For example, the contents of the "HARQ feedback enabled / disabled indicator" field may be 00=disabled, 01=enabled via PSFCH, 10=enabled via PSSCH, or 11=enabled via both.

[0074] Furthermore, in resource pools where a PSFCH resource is not configured, HARQ-ACK information may be sent via PSSCH.

[0075] According to the HARQ-ACK information triggering method of this embodiment, the trigger for transmitting HARQ-ACK information via PSSCH can be determined in an appropriate manner.

[0076] (Example 4) Example 4 describes how to determine the resources of the PSSCH for transmitting HARQ-ACK information.

[0077] <Option 1> The first terminal 20A may request HARQ feedback, and the second terminal 20B may select a resource based on the request and send HARQ-ACK information using the selected resource. This may be similar to the method of CSI reporting in sidelinks.

[0078] In this case, latency requirements until transmission is complete may be defined, for example, as the "sl-LatencyBound-HARQ-Report" field. Latency requirements may be set by the PC5-RRC signal. Alternatively, a timer may be started based on these parameters after the HARQ feedback is triggered in the manner shown in Example 3.

[0079] <Option 2> The first terminal 20A may reserve or instruct a PSCCH / PSSCH resource for transmitting HARQ-ACK information.

[0080] For example, the first terminal 20A may reserve a resource using the same SCI fields (time resource assignment field, frequency resource assignment field, resource reservation period field) as it reserves its own transmission resources, and may notify via the SCI that the resource is reserved or instructed for the second terminal 20B.

[0081] Furthermore, the first terminal 20A may reserve or indicate using an SCI field or a different SCI format from the fields described above.

[0082] A third terminal, distinct from the first terminal 20A or the second terminal 20B, may detect the resource reservation described above by sensing and perform resource identification or selection operations to avoid collisions. The operation of the third terminal may be the same as the operation for conventional resource reservations (i.e., the operation of deciding whether or not to exclude a resource from the candidate resources based on the received power and priority of the resource reservation described above).

[0083] <Option 3> The second terminal 20B may determine a PSCCH / PSSCH resource for transmitting HARQ-ACK information based on the corresponding PSCCH / PSSCH (transmitted from the first terminal 20A). That is, the corresponding PSCCH / PSSCH resource and the PSCCH / PSSCH resource for transmitting HARQ-ACK information may be associated in a predetermined manner.

[0084] For example, the second terminal 20B may determine the PSCCH / PSSCH resource for transmitting HARQ-ACK information in the time resource after the X slot, using the same frequency resource as the PSCCH / PSSCH transmitted from the first terminal 20A.

[0085] Similar to option 2, the third terminal may detect the resource reservation described above by sensing and perform resource identification or selection operations to avoid collisions. The third terminal may also determine to exclude the PSCCH / PSSCH resource for HARQ-ACK information transmission with the same RSRP or priority as the corresponding PSCCH / PSSCH.

[0086] According to the PSCCH / PSSCH resource method for transmitting HARQ-ACK information in this embodiment, the resources for transmitting HARQ-ACK information can be determined in an appropriate manner. Method 1 allows for the simplification of the configuration of each terminal by reusing existing methods, and reduces the impact on the transport block transmission of the second terminal 20B. Furthermore, methods 2 or 3 allow for immediate HARQ feedback via PSSCH, thus avoiding collisions with transmission resources.

[0087] (Note) In each of the embodiments described above, the PSSCH for transmitting HARQ-ACK information may have a different name. For example, it may be called PSFCH format 1. Here, PSFCH format 1 may be a channel with the same time width as PSCCH / PSSCH. Also, PSFCH format 1 may be transmitted using the same frequency resources as PSCCH / PSSCH, or it may be transmitted using different frequency resources.

[0088] The PSSCH for transmitting HARQ-ACK information may be limited to unicast. For example, the second terminal 20B may transmit the PSSCH for transmitting HARQ-ACK information to the first terminal 20A via unicast.

[0089] Furthermore, the second terminal 20B may generate the HARQ-ACK bits transmitted via PSSCH using only the information associated with the unicast.

[0090] (Device configuration) Next, an example of the functional configuration of a terminal that performs the processes and operations described above will be explained. The first terminal 20A and the second terminal 20B include the functions to perform the embodiments described above. However, the first terminal 20A and the second terminal 20B may each be equipped with only the functions proposed in one of the embodiments.

[0091] <First terminal 20A and second terminal 20B> Figure 9 shows an example of the functional configuration of a terminal in an embodiment of the present invention. As shown in Figure 9, the first terminal 20A or the second terminal 20B has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 9 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called the communication unit.

[0092] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains signals from higher layers from the received physical layer signals. The transmitting unit 210 also transmits a HARQ-ACK, and the receiving unit 220 receives the configuration information and the like as described in the embodiment.

[0093] The setting unit 230 stores various setting information received from the base station by the receiving unit 220 in a storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-set setting information. The control unit 240 controls the entire terminal 20, including control related to signal transmission and reception. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220. The transmission unit 210 and the reception unit 220 may also be called the transmitter and receiver, respectively.

[0094] The terminal of this embodiment may be configured as one of the terminals described in the following sections. Furthermore, the following communication methods may be implemented.

[0095] <Configuration of this embodiment> (Section 1) In the unlicensed band, a receiving unit receives a control channel or shared channel from another terminal, A control unit that decides to transmit feedback corresponding to the control channel or the shared channel to the other terminal via the shared channel, The system includes a transmitting unit that transmits the feedback via the shared channel in accordance with the aforementioned decision, Terminal. (Section 2) The control unit determines HARQ response information based on instructions from the other terminal or based on the control channel or shared channel corresponding to the feedback. The transmitting unit transmits the determined HARQ response information to the other terminal via the shared channel. The terminal described in paragraph 1. (Section 3) The control unit decides to multiplex the HARQ response information onto a shared channel for transmitting to the other terminal and transmit it to the other terminal. The terminal described in paragraph 1 or 2. (Section 4) The control unit decides to transmit the feedback to the other terminal via the shared channel based on a request from the other terminal or when predetermined conditions are met. A terminal as described in any one of paragraphs 1 through 3. (Section 5) The control unit determines the transmission resources to be used for the feedback based on a request from the other terminal or based on resources reserved or instructed by the other terminal. A terminal as described in any one of paragraphs 1 through 4. (Section 6) In the unlicensed band, the steps include receiving a control channel or shared channel from another terminal, The step of deciding to transmit feedback corresponding to the control channel or the shared channel to the other terminal via the shared channel, The terminal performs the steps of: sending the feedback via the shared channel in accordance with the aforementioned decision; Communication method.

[0096] Any of the above configurations provides a technology that enables highly compliant direct terminal-to-terminal communication. According to paragraph 2, the HARQ-ACK information to be transmitted can be uniquely determined. According to paragraph 3, the HARQ-ACK information can be transmitted over a shared channel. According to paragraph 4, the trigger for transmitting the HARQ-ACK information over a shared channel can be determined in an appropriate manner. According to paragraph 5, the resources for transmitting the HARQ-ACK information can be determined in an appropriate manner.

[0097] (Hardware configuration) The block diagram (Figure 9) used in the description of the above embodiment shows functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the above one device or the above multiple devices with software.

[0098] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0099] For example, the first terminal 20A, the second terminal 20B, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 10 is a diagram showing an example of the hardware configuration of a terminal according to one embodiment of the present disclosure. The first terminal 20A and the second terminal 20B described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0100] In the following explanation, the term "device" can be read as "circuit," "device," "unit," etc. The hardware configuration of the first terminal 20A and the second terminal 20B may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0101] Each function in the first terminal 20A and the second terminal 20B is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002, which causes the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0102] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0103] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the terminal control unit 240 shown in Figure 9 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described processes have been explained as being 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. The program may also be transmitted from the network via a telecommunications line.

[0104] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0105] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0106] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0107] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0108] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0109] Furthermore, the first terminal 20A and the second terminal 20B may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0110] Figure 11 shows an example of the vehicle configuration. As shown in Figure 11, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on the vehicle 2001, for example, to the communication module 2013.

[0111] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0112] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0113] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0114] The Information Services Unit 2012 consists of various devices for providing various types of information, such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0115] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0116] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0117] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0118] The communication module 2013 transmits current signals from current sensors input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits, via wireless communication, other signals input to the electronic control unit 2010, including front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0119] The communication module 2013 receives various information (traffic information, signal information, distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 installed in the vehicle 2001. The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., installed in the vehicle 2001.

[0120] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0121] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out 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, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0122] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), 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)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0123] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0124] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0125] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0126] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0127] Software should be broadly interpreted 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, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0128] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0129] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that 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.

[0130] In addition, terms used 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 the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0131] The terms “system” and “network” as used in this disclosure are interchangeable.

[0132] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0133] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0134] In this disclosure, terms such as "base station (BS)", "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0135] A base station can accommodate one or more (e.g., three) cells. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0136] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0137] 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 several other appropriate terms.

[0138] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operation. 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.

[0139] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminal may have the functions that the base station has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0140] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0141] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0142] The terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0143] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0144] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0145] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0146] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0147] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0148] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0149] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0150] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurologic.

[0151] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0152] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0153] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 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 subframe.

[0154] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal to allocate radio resources (such as the frequency bandwidth and transmission power available to each terminal) in TTI units. However, the definition of TTI is not limited to this.

[0155] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0156] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0157] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0158] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0159] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0160] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0161] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0162] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0163] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0164] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0165] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0166] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0167] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0168] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0169] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0170] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of Symbols]

[0171] 20A First terminal 20B Second terminal 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Front Wheel 2008 Rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. In the unlicensed band, a receiving unit receives a control channel or shared channel from another terminal, A control unit that decides to transmit feedback corresponding to the control channel or the shared channel to the other terminal via the shared channel, The system includes a transmitting unit that transmits the feedback via the shared channel in accordance with the aforementioned decision, The control unit decides to transmit the feedback to the other terminal via the shared channel when predetermined conditions are met. The terminal transmits the feedback using the shared channel after a predetermined time has elapsed since the previous transmission of feedback using the shared channel. Terminal.

2. The control unit determines HARQ response information based on instructions from the other terminal or based on the control channel or shared channel corresponding to the feedback. The transmitting unit transmits the determined HARQ response information to the other terminal via the shared channel. The terminal according to claim 1.

3. The control unit decides to multiplex the HARQ response information onto a shared channel for transmitting to the other terminal and transmit it to the other terminal. The terminal according to claim 1 or 2.

4. The control unit determines the transmission resources to be used for the feedback based on a request from the other terminal or based on resources reserved or instructed by the other terminal. The terminal according to claim 1.

5. In the unlicensed band, the steps include receiving a control channel or shared channel from another terminal, The step of deciding to transmit feedback corresponding to the control channel or the shared channel to the other terminal via the shared channel, The steps include sending the feedback via the shared channel in accordance with the aforementioned decision, The steps include deciding to send the feedback to the other terminal via the shared channel when certain conditions are met, The terminal executes, The terminal transmits the feedback using the shared channel after a predetermined time has elapsed since the previous transmission of feedback using the shared channel. Communication method.

Images