Terminal and communication method

Abstract

A terminal has a control section that decides which transmission to give priority to in a case where a first transmission to another terminal and a second transmission to a base station at least overlap in a time domain, and a transmission section that performs power control or transmission control of the first transmission and the second transmission in accordance with the decision, the control section changing control related to the decision of the priority of the transmission in accordance with a setting related to communication.

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 its successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also known as 5G)), D2D (Device to Device) technology, which allows direct communication between terminals without going through a base station, is being studied (e.g., non-patent document 1).

[0003] D2D reduces the traffic between terminals and base stations, enabling inter-terminal communication even when base stations are unable to communicate, such as during disasters. While 3GPP (3rd Generation Partnership Project) refers to D2D as "sidelink," this specification uses the more general term D2D. However, in the following descriptions of the embodiments, sidelink may also be used as needed.

[0004] D2D communication is broadly divided into D2D discovery (also called D2D discovery) for discovering other terminals with which communication can be performed, and D2D communication (also called D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between terminals. Hereinafter, when no special distinction is made between D2D communication (D2D communication), D2D discovery (D2D discovery), etc., they are referred to as D2D for short. In addition, signals sent and received via D2D are referred to as D2D signals. Various use cases for services related to V2X (Vehicle to Everything) in NR are being studied (e.g., Non-Patent Document 2).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: 3GPP TS 36.211 V15.8.1 (2020-01)

[0008] Non-Patent Document 2: 3GPP TR 22.886 V15.1.0 (2017-03) Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In NR inter-device direct communication, when sidelink and uplink transmissions on different carriers overlap in the time domain, the terminal allocates more power to the transmission with higher priority. Furthermore, depending on the situation, the terminal may discard the sidelink transmission. However, it is not yet specified whether the sidelink or uplink should be prioritized.

[0011] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to determine a transmission to be prioritized when a plurality of transmissions overlap in a wireless communication system.

[0012] Means for solving problems

[0013] According to the disclosed technology, a terminal is provided, comprising: a control unit that determines which transmission to give priority when a first transmission to other terminals and a second transmission to a base station overlap at least in the time domain; and a transmission unit that performs power control or transmission control of the first transmission and the second transmission based on the decision, wherein the control unit changes the control related to the determination of the priority of the transmission based on settings related to the communication.

[0014] Effects of the Invention

[0015] According to the disclosed technology, in a wireless communication system, when multiple transmissions overlap, it is possible to determine which transmission to prioritize. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram used to explain V2X.

[0017] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode.

[0018] Figure 3 This is a diagram for explaining example (2) of the V2X transmission mode.

[0019] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode.

[0020] Figure 5 This is a diagram for explaining example (4) of the V2X transmission mode.

[0021] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode.

[0022] Figure 7 This is a diagram for explaining example (1) of the V2X communication type.

[0023] Figure 8 This is a diagram for explaining example (2) of the V2X communication type.

[0024] Figure 9 This is a diagram for explaining example (3) of the V2X communication type.

[0025] Figure 10 This is a timing diagram showing an operation example (1) of V2X.

[0026] Figure 11 This is a timing diagram showing an operation example (2) of V2X.

[0027] Figure 12 This is a timing diagram showing an operation example (3) of V2X.

[0028] Figure 13 This is a timing diagram showing an operation example (4) of V2X.

[0029] Figure 14 This is a flowchart for explaining an example of transmission processing in the embodiment of the present invention.

[0030] Figure 15 This is a diagram showing an example of priority in the embodiment of the present invention.

[0031] Figure 16 This is a flowchart for explaining example (1) of the process related to priority assignment in the embodiment of the present invention.

[0032] Figure 17 This is a flowchart for explaining Example (2) of the process related to priority assignment in the embodiment of the present invention.

[0033] Figure 18 This is a flowchart for explaining example (3) of the process related to priority assignment in the embodiment of the present invention.

[0034] Figure 19 This is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

[0035] Figure 20 This is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention.

[0036] Figure 21 This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 in the embodiment of the present invention. DETAILED DESCRIPTION

[0037] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0038] When operating the wireless communication system according to the embodiments of the present invention, existing technologies are appropriately used. However, this existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning that includes LTE-Advanced and post-LTE-Advanced systems (for example, NR) or wireless LANs (Local Area Networks).

[0039] Furthermore, in the embodiment of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, flexible duplex, etc.).

[0040] Furthermore, in the embodiment of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from the base station 10 or the terminal 20 .

[0041] Figure 1 This is a diagram for explaining V2X. 3GPP is researching technologies to implement V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality and is promoting standardization. Figure 1 As shown, V2X is a part of ITS (Intelligent Transport Systems), and is a general term for V2V (Vehicle to Vehicle) which represents the communication between vehicles, V2I (Vehicle to Infrastructure) which represents the communication between vehicles and roadside equipment (RSU: Road-Side Unit) installed next to the road, V2N (Vehicle to Network) which represents the communication between vehicles and ITS servers, and V2P (Vehicle to Pedestrian) which represents the communication between vehicles and mobile terminals held by pedestrians.

[0042] Furthermore, 3GPP is researching V2X, which utilizes cellular communications and inter-device communications using LTE or NR. V2X using cellular communications is also referred to as cellular V2X. Research is progressing on achieving high capacity, low latency, high reliability, and QoS (Quality of Service) control in NR-based V2X.

[0043] Regarding LTE and NR V2X, research beyond the 3GPP specifications is envisioned. For example, research is envisioned to ensure interoperability, reduce costs associated with high-level installation, integrate and switch between multiple RATs (Radio Access Technologies), support regulations in various countries, and acquire, publish, and manage databases for data on LTE and NR V2X platforms.

[0044] While the embodiments of the present invention primarily envision the communication device being 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 node, or terminal with scheduling capabilities.

[0045] In addition, SL (Sidelink) can also be distinguished by UL (Uplink) or DL ​​(Downlink) and any one or a combination of the following 1) to 4). In addition, SL can also be other names.

[0046] 1) Time Domain Resource Allocation

[0047] 2) Frequency Domain Resource Allocation

[0048] 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))

[0049] 4) Reference signal used for path loss measurement for transmit power control

[0050] Furthermore, for SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), OFDM without transform precoding, or OFDM with transform precoding can be used. SL can also operate in a multi-carrier environment.

[0051] LTE's SL specifies Mode 3 and Mode 4 for SL resource allocation to terminal 20. In Mode 3, transmission resources are dynamically allocated using DCI (Downlink Control Information) sent from base station 10 to terminal 20. Mode 3 also supports Semi-Persistent Scheduling (SPS). In Mode 4, terminal 20 autonomously selects transmission resources from a resource pool.

[0052] In addition, the time slot in the embodiments of the present invention may be replaced by a symbol, a mini-slot, a subframe, a radio frame, or a TTI (Transmission Time Interval). Furthermore, the cell in the embodiments of the present invention may be replaced by a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.

[0053] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode. Figure 2 In the transmission mode of the sidelink communication shown in FIG, in step 1, the base station 10 sends the sidelink scheduling information to the terminal 20A. Then, the terminal 20A sends the PSCCH (Physical Sidelink Control Channel) and PSSCH (Physical Sidelink Shared Channel) to the terminal 20B based on the received scheduling information (step 2). Figure 2The transmission mode of the sidelink communication shown is called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, sidelink scheduling based on Uu is performed. Uu refers to the radio interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment). Figure 2 The transmission mode of the sidelink communication shown is called sidelink transmission mode 1 in NR.

[0054] Figure 3 This is a diagram for explaining example (2) of the V2X transmission mode. Figure 3 In the transmission mode of the side link communication shown in FIG, in step 1, the terminal 20A transmits the PSCCH and PSSCH to the terminal 20B using the resources selected autonomously. Figure 3 The transmission mode of the sidelink communication shown is called sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, the UE itself performs resource selection.

[0055] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode. Figure 4 In the transmission mode of the sidelink communication shown in FIG, in step 1, the terminal 20A uses the resources selected autonomously to transmit the PSCCH and PSSCH to the terminal 20B. Similarly, the terminal 20B uses the resources selected autonomously to transmit the PSCCH and PSSCH to the terminal 20A (step 1). Figure 4 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2a in NR. In sidelink transmission mode 2 in NR, the terminal 20 performs resource selection itself.

[0056] Figure 5 This is a diagram for explaining example (4) of the V2X transmission mode. Figure 5 In the transmission mode of the sidelink communication shown in FIG, in step 0, the base station 10 sets a grant for transmitting the sidelink to the terminal 20A via RRC (Radio Resource Control). Then, the terminal 20A transmits the PSSCH to the terminal 20B according to the received resource mode (step 1). Figure 5 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2c in NR.

[0057] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode. Figure 6In the transmission mode of the side link communication shown in FIG, in step 1, terminal 20A transmits the scheduling information of the side link to terminal 20B via PSCCH. Then, terminal 20B transmits PSSCH to terminal 20A based on the received scheduling information (step 2). Figure 6 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2d in NR.

[0058] Figure 7 This is a diagram for explaining example (1) of the V2X communication type. Figure 7 The communication type of the side link shown is unicast. Terminal 20A sends PSCCH and PSSCH to terminal 20. Figure 7 In the example shown, the terminal 20A performs unicast to the terminal 20B, and also performs unicast to the terminal 20C.

[0059] Figure 8 This is a diagram for explaining example (2) of the V2X communication type. Figure 8 The communication type of the side link shown is multicast. Terminal 20A transmits PSCCH and PSSCH to the group to which one or more terminals 20 belong. Figure 8 In the example shown, the group includes the terminal 20B and the terminal 20C, and the terminal 20A performs multicast for the group.

[0060] Figure 9 This is a diagram for explaining example (3) of the V2X communication type. Figure 9 The communication type of the side link shown is broadcast. Terminal 20A transmits PSCCH and PSSCH to one or more terminals 20. Figure 9 In the example shown, terminal 20A broadcasts to terminal 20B, terminal 20C, and terminal 20D. Figures 7 to 9 The terminal 20A shown is referred to as a head UE (header-UE).

[0061] Furthermore, NR-V2X envisions supporting HARQ (Hybrid Automatic Repeat Request) in both unicast and multicast on the sidelink. Furthermore, NR-V2X defines SFCI (Sidelink Feedback Control Information) that includes HARQ responses. Furthermore, research is underway to transmit SFCI via the Physical Sidelink Feedback Channel (PSFCH).

[0062] In the following description, it is assumed that the PSFCH is used for transmission of HARQ-ACK on the sidelink. However, this is only an example. For example, HARQ-ACK on the sidelink may be transmitted using the PSCCH, the PSSCH, or other channels.

[0063] For convenience, all information reported by terminal 20 in HARQ will be referred to as HARQ-ACK below. This HARQ-ACK may also be referred to as HARQ-ACK information. Furthermore, more specifically, the codebook used for HARQ-ACK information reported from terminal 20 to base station 10, etc., is referred to as the HARQ-ACK codebook. The HARQ-ACK codebook defines the bit string of the HARQ-ACK information. Furthermore, HARQ-ACK allows NACKs to be transmitted in addition to ACKs.

[0064] Figure 10 This is a diagram showing an example (1) of the structure and operation of a wireless communication system in an embodiment of the present invention. Figure 10 As shown in FIG. 1 , the wireless communication system according to the embodiment of the present invention includes a terminal 20A and a terminal 20B. In addition, there are actually a plurality of user devices, but Figure 10 The terminal 20A and the terminal 20B are shown as examples.

[0065] Hereinafter, when the terminals 20A and 20B are not particularly distinguished, they are simply referred to as "terminal 20" or "user device". Figure 10 In the embodiment, the case where both the terminal 20A and the terminal 20B are within the coverage of the cell is shown as an example, but the operation in the embodiment of the present invention can also be applied to the case where the terminal 20B is outside the coverage.

[0066] As described above, in this embodiment, the terminal 20 is a device mounted on a vehicle, such as an automobile, and has cellular communication functions and sidelink functions as a UE in LTE or NR. The terminal 20 may also be a general portable terminal (such as a smartphone). Furthermore, the terminal 20 may also be an RSU. This RSU may be a UE-type RSU (UE type RSU) that has UE functions, or a gNB-type RSU (gNB type RSU) that has base station functions.

[0067] Furthermore, the terminal 20 does not need to be a device having a single housing. For example, even when various sensors are dispersedly arranged in a vehicle, a device including these various sensors is also the terminal 20 .

[0068] Furthermore, the processing of sidelink transmit data by terminal 20 is essentially the same as that of UL transmission in LTE or NR. For example, terminal 20 scrambles the codewords of transmit data, modulates them, and generates complex-valued symbols. These complex-valued symbols (transmit signals) are mapped to layer 1 or layer 2 and precoded. The precoded complex-valued symbols are then mapped to resource elements to generate a transmit signal (e.g., a complex-valued time-domain SC-FDMA signal), which is then transmitted from each antenna port.

[0069] The base station 10 also has cellular communication functions as a base station in LTE or NR, as well as functions for enabling communication with the terminal 20 in this embodiment (e.g., resource pool configuration, resource allocation, etc.). Furthermore, the base station 10 may also be an RSU (gNB-type RSU).

[0070] Furthermore, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by the terminal 20 in the SL or UL may be OFDMA, SC-FDMA, or other signal waveforms.

[0071] In step S101 , the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set by the base station 10 for the terminal 20 .

[0072] In steps S102 and S103, terminal 20A uses the resources autonomously selected in step S101 to transmit SCI (Sidelink Control Information) using the PSCCH and transmit SL data using the PSSCH. For example, terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH's frequency resources.

[0073] Terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received via the PSCCH may include information about the PSFCH resources used by terminal 20B to transmit HARQ-ACK for the received data. Terminal 20A may include information about the autonomously selected resources in the SCI and transmit it.

[0074] In step S104 , the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH specified by the received SCI.

[0075] If the HARQ-ACK received in step S104 indicates a retransmission request, that is, a NACK (negative acknowledgement), terminal 20A retransmits PSCCH and PSSCH to terminal 20B in step S105. Terminal 20A can retransmit PSCCH and PSSCH using autonomously selected resources.

[0076] In addition, when HARQ control is not performed, step S104 and step S105 may not be performed.

[0077] Figure 11 This is a diagram showing an example (2) of the configuration and operation of a wireless communication system in an embodiment of the present invention. Blind retransmission may be performed independently of HARQ control for improving the transmission success rate or reach.

[0078] In step S201 , the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set by the base station 10 for the terminal 20 .

[0079] In steps S202 and S203, terminal 20A uses the resources autonomously selected in step S201 to transmit SCI using PSCCH and transmit SL data using PSSCH. For example, terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH frequency resources.

[0080] In step S204, the terminal 20A retransmits the SCI based on the PSCCH and the SL data based on the PSSCH to the terminal 20B using the resources autonomously selected in step S201. The retransmission in step S204 may be performed multiple times.

[0081] In addition, when blind retransmission is not performed, step S204 may not be performed.

[0082] Figure 12 This figure shows an example (3) of the structure and operation of a wireless communication system in an embodiment of the present invention. The base station 10 can perform sidelink scheduling. That is, the base station 10 can determine the sidelink resources used by the terminal 20 and transmit information indicating the resources to the terminal 20. Furthermore, when HARQ control is applied, the base station 10 can transmit information indicating PSFCH resources to the terminal 20.

[0083] In step S301, the base station 10 transmits DCI (Downlink Control Information) to the terminal 20A using the PDCCH, thereby performing SL scheduling. Hereinafter, for convenience of explanation, the DCI for SL scheduling is referred to as SL scheduling DCI.

[0084] Furthermore, the following scenario is envisioned: in step S301, the base station 10 also transmits DCI for DL ​​scheduling (also referred to as DL allocation) to the terminal 20A using the PDCCH. Hereinafter, for convenience, the DCI for DL ​​scheduling is referred to as DL scheduling DCI. Upon receiving the DL scheduling DCI, the terminal 20A receives DL data using the PDSCH using the resources specified by the DL scheduling DCI.

[0085] In steps S302 and S303, Terminal 20A uses the resources specified by the SL scheduling DCI to transmit SCI (Sidelink Control Information) using the PSCCH and transmit SL data using the PSSCH. Alternatively, the SL scheduling DCI may specify only PSSCH resources. In this case, for example, Terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH's frequency resources.

[0086] Terminal 20B receives SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received on the PSCCH includes information on PSFCH resources for terminal 20B to transmit HARQ-ACK for receiving the data.

[0087] The resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301. The terminal 20A may also obtain the resource information from the DL scheduling DCI or SL scheduling DCI and include it in the SCI. Alternatively, if the DCI transmitted from the base station 10 does not include the resource information, the terminal 20A may autonomously include the resource information in the SCI and transmit it.

[0088] In step S304 , the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH specified by the received SCI.

[0089] In step S305, terminal 20A transmits a HARQ-ACK using the PUCCH (Physical uplink control channel) resources specified by the DL scheduling DCI (or SL scheduling DCI), for example, at the timing (e.g., timing in slots) specified by the DL scheduling DCI (or SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The HARQ-ACK codebook may include the HARQ-ACK received from terminal 20B and the HARQ-ACK for DL ​​data. However, if no DL data is allocated, the HARQ-ACK for DL ​​data is not included.

[0090] In addition, when HARQ control is not performed, step S304 and step S305 may not be performed.

[0091] Figure 13 This is a diagram showing an example of action (4) in an embodiment of the present invention. As described above, in the side link of NR, the case of sending HARQ responses through PSFCH is supported. In addition, the format of PSFCH can use the same format as PUCCH (Physical Uplink Control Channel) format 0 (PUCCH format 0). That is, regarding the format of PSFCH, it can be a sequence-based format in which the PRB (Physical Resource Block) size is 1 and ACK and NACK are identified based on the difference in the sequence. The format of PSFCH is not limited to this. The resources of PSFCH can be configured as a codeword at the end of the time slot or multiple codewords at the end. In addition, a period N is set or predefined for the PSFCH resources. The period N can be set or predefined in units of time slots.

[0092] exist Figure 13 In the figure, the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain. PSCCH can be configured in one symbol at the beginning of the time slot, or in multiple symbols starting from the beginning, or in multiple symbols starting from a symbol other than the beginning. PSFCH can be configured in one symbol at the end of the time slot, or in multiple symbols at the end of the time slot. Figure 13 In the example shown, three subchannels are configured in the resource pool, and two PSFCHs are configured three slots after the slot in which the PSSCH is configured. The arrow from the PSSCH to the PSFCH represents an example of the PSFCH associated with the PSSCH.

[0093] When the HARQ response in NR-V2X multicast is option 2 of sending ACK or NACK, it is necessary to determine the resources used for PSFCH transmission and reception. Figure 13 As shown, in step S401, terminal 20A as the transmitting terminal 20 performs multicast via SL-SCH to terminal 20B, terminal 20C and terminal 20D as the receiving terminal 20. In the next step S402, terminal 20B uses PSFCH#B to send a HARQ response to terminal 20A, terminal 20C uses PSFCH#C to send a HARQ response to terminal 20A, and terminal 20D uses PSFCH#D to send a HARQ response to terminal 20A. Figure 13 As shown in the example, when the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to decide how to allocate PSFCH resources. In addition, the transmitting terminal 20 can grasp the number of receiving terminals 20 in the multicast.

[0094] Here, when SL and UL transmissions sent on different carriers overlap in the time domain, more power can be allocated to the transmission with higher priority. Furthermore, depending on the situation, the SL transmission can sometimes be discarded. Hereinafter, "overlap" primarily refers to resource overlap in the time domain, but "overlap" also applies to resource overlap in at least one of the time, frequency, or code domains.

[0095] In addition, when supporting simultaneous transmission of SL and UL in different carriers, power may be limited as shown in 1) to 3) below.

[0096] 1) When SL transmission takes priority over UL transmission, the terminal 20 adjusts the UL transmission power before starting transmission so that the total transmission power in the overlapped portion does not exceed P_CMAX. Note that P_CMAX is the maximum transmission power of the terminal 20.

[0097] 2) When UL transmission takes priority over SL transmission, the terminal 20 adjusts the SL transmission power before starting transmission so that the total transmission power in the overlapping portion does not exceed P_CMAX.

[0098] 3) When SL and UL are transmitted simultaneously, the SL transmit power is the same across all symbols used for the actual PSCCH / PSSCH transmission within the time slot. If there is a UL with a higher priority than the SL and the terminal 20 cannot maintain the same SL transmit power across these symbols, symbols of either PSCCH / PSSCH transmission may be discarded. The selection of discarded symbols, including overlapping symbols, may also depend on the UE's implementation.

[0099] Furthermore, if simultaneous SL and UL transmissions exceed the UE's capabilities, non-prioritized transmissions may be discarded. Furthermore, with regard to simultaneous SL and UL transmissions, it is possible to determine when and which transmission is prioritized, specify processing time for the terminal 20, allow for the possibility of discarding several symbols of UL transmissions, and specify RF migration periods.

[0100] In addition, the priority of SL and UL in LTE is as follows.

[0101] When the value representing the highest priority of the SL logical channel within the MAC-PDU (Medium Access Control-Protocol data unit) is smaller than the set threshold (that is, the priority becomes a priority higher than the threshold), the SL takes precedence over the UL. When the value representing the highest priority of the SL logical channel within the MAC-PDU is larger than the set threshold, or when no threshold is set, the UL takes precedence over the SL.

[0102] The priority of UL transmission and SL transmission in NR can also be determined based on at least one of a)-m) shown below.

[0103] a) High-level parameters

[0104] b) PHY layer SL priority

[0105] c) PHY layer UL priority

[0106] d) High-level SL priority

[0107] e) High-level UL priority

[0108] f)SL channel or signal

[0109] g) UL channel or signal

[0110] h) SL resource allocation (RA) mode

[0111] i) SL scheduling type

[0112] j) UL scheduling type

[0113] k) Scheduling and Timing

[0114] l) Whether HARQ feedback is available

[0115] m) HARQ feedback type

[0116] Figure 14This is a flowchart illustrating an example of transmission processing in an embodiment of the present invention. In step S501, terminal 20 detects an overlap between UL transmission and SL transmission. Next, terminal 20 determines the priority of UL transmission and the priority of SL transmission (S502). Next, terminal 20 allocates more power to the transmission with higher priority between UL transmission and SL transmission (S503). Furthermore, terminal 20 may discard transmission with lower priority. Alternatively, step S502 may be performed before step S501.

[0117] Figure 15 This figure illustrates an example of priority in an embodiment of the present invention. Priority can also be determined based on parameters X and Y, which represent the priority in SL transmission. The value of parameter X can also mean that it is smaller than the value of parameter Y, that is, the priority represented by parameter X is higher than the priority represented by parameter Y. Parameters X and Y can be high-level parameters or PHY layer parameters.

[0118] In addition, the priority between SL transmissions can be set, and the priority between UL transmissions can also be set. The priority between SL transmissions and the priority between UL transmissions can be notified by the upper layer or by the PHY layer. For example, the value representing the priority between SL transmissions can also be set to a value smaller than parameter X (i.e., a priority higher than the priority represented by parameter X), a value greater than parameter X and smaller than parameter Y (i.e., a priority lower than the priority represented by parameter X and higher than the priority represented by parameter Y), a value greater than parameter Y (i.e., a priority lower than the priority represented by parameter Y), etc. For example, the priority between UL transmissions can also be set to "high" for PUSCH / PUSCH such as PRACH and URLLC (Ultra reliable low latency) and "low" for PUSCH / PUSCH such as SRS (Sounding reference signal) and eMBB (enhanced Mobile Broadband). In addition, "above" and "larger (higher) than...", "below" and "smaller (lower) than..." can also be replaced respectively. Hereinafter, "priority X" may mean parameter X or the priority indicated by parameter X. "Priority" Y may mean parameter Y or the priority indicated by parameter Y.

[0119] exist Figure 14 In step S502 shown in FIG. Figure 15As shown, it may be determined that the priority of "PSSCH / PSSCH / PSFCH having a higher priority than priority X" is the highest. Note that "PSSCH / PSSCH / PSFCH" means at least one channel among PSSCH, PSSCH, and PSFCH.

[0120] like Figure 15 As shown, the channel with priority second only to "PSSCH / PSSCH / PSFCH with priority higher than priority X" can also be "PRACH and PUSCH / PUCCH with higher priority (for example, URLLC)". In addition, "PUSCH / PUCCH" means the channel of at least one of PUSCH and PUCCH.

[0121] like Figure 15 As shown, the channel with priority second only to "PRACH and PUSCH / PUCCH with higher priority (such as URLLC)" can also be "PSCCH / PSSCH / PSFCH with priority lower than priority X and higher than priority Y".

[0122] like Figure 15 As shown, the channel with priority second only to "PSCCH / PSSCH / PSFCH with priority lower than priority X and higher than priority Y" can also be "SRS (Sounding reference signal) and PUSCH / PUCCH with lower priority (such as eMBB)".

[0123] like Figure 15 As shown, the channel with priority second only to "SRS and PUSCH / PUCCH with lower priority (such as eMBB)" can also be "PSCCH / PSSCH / PSFCH with priority lower than priority Y".

[0124] In the following, “according to Figure 15 The action of performing at least one comparison based on the priorities shown and determining whether SL transmission or UL transmission is to be transmitted with priority is referred to as “action A1 related to priority”.

[0125] Apart from Figure 15 In addition to the priorities shown, if no further parameter X is set, "PRACH and PUSCH / PUCCH with higher priority (such as URLLC)" can always be prioritized. Hereinafter, this action is referred to as "Action A2 related to priority."

[0126] Apart from Figure 15In addition to the priorities shown, if parameter Y is not further configured, the priority of "PSCCH / PSSCH / PSFCH with a lower priority than priority X" can be always lowered. In other words, "PSCCH / PSSCH / PSFCH with a lower priority than priority X" can be given a lower priority than "SRS and PUSCH / PUCCH with a lower priority (e.g., eMBB)." This action is referred to as "Action A3 related to priority."

[0127] Even when both parameter X and parameter Y are not set, either UL transmission or SL transmission can always be prioritized. This operation is hereinafter referred to as "Action A4 concerning priority."

[0128] The priority of the PSFCH may be notified by the SCI corresponding to the PSSCH corresponding to the PSFCH, or may be notified by the MAC-PDU transmitted by the PSSCH. Hereinafter, this operation is referred to as "Action A5 related to priority."

[0129] Apart from Figure 15 In addition to the priorities shown, specific channels or signals can also be prioritized based on different rules. This action is referred to below as "Action A6 Related to Priority." For example, PRACH can always be prioritized. For example, PUCCH / PUSCH with HARQ-ACK can always be prioritized. For example, PUCCH / PUSCH with SR / CSI can always be prioritized. For example, SRS can always be prioritized. For example, PSFCH can always be prioritized.

[0130] By determining the priority as described above, it is possible to flexibly set the priority according to the traffic types of SL and UL. In addition, it is possible to set the priority of channels or signals based on the importance of the traffic type according to the communication conditions.

[0131] Figure 16 This is a flowchart for explaining example (1) of the process related to priority assignment in the embodiment of the present invention. The operation related to priority assignment can also be controlled according to the SL resource allocation pattern.

[0132] In step S601 , when the SL resource allocation mode is mode 1 (mode1), the terminal 20 proceeds to step S602 , and when the SL resource allocation mode is mode 2 (mode2), the terminal 20 proceeds to step S603 .

[0133] In step S602 , the terminal 20 may also perform any one of the following 1)-4).

[0134] 1) Make Figure 15The one with higher priority is sent first.

[0135] 2) Give priority to transmission after the time when the scheduling action is executed.

[0136] 3) Overlapping of transmissions is not envisaged.

[0137] 4) Prioritize the transmission to be prioritized set by the base station 10.

[0138] On the other hand, in step S603, the terminal 20 may also perform any one of the following 1) to 4).

[0139] 1) Make Figure 15 The higher priority is sent first. The so-called step S602 1) can change the setting by changing parameter X or parameter Y, for example.

[0140] 2) When UL transmission has a high priority (such as URLLC), UL transmission is prioritized; when UL transmission has a low priority (such as eMBB), SL transmission is prioritized.

[0141] 3) Make UL transmission always prioritized.

[0142] 4) Determine the transmission to be prioritized based on the UE's installation (information indicating the priority may also be reported to the base station 10).

[0143] In addition, "1) in step S602 and step S603 makes Figure 15 "Sending priority is given to actions with higher priority" can also be replaced by "performing at least one of "priority-related action A1", "priority-related action A2", "priority-related action A3", "priority-related action A4", "priority-related action A5" and "priority-related action A6"."

[0144] In addition, SL resource allocation mode 1 may also be an SL transmission mode in which the base station 10 performs scheduling, and SL resource allocation mode 2 may also be an SL transmission mode in which the terminal 20 autonomously selects resources.

[0145] As described above, by performing actions related to prioritization based on the SL resource allocation mode, appropriate rules can be applied when base station 10 schedules SL transmissions and when it does not. Furthermore, in SL resource allocation mode 2, in which terminal 20 autonomously selects resources, prioritizing the UL can improve resource utilization efficiency.

[0146] Figure 17This is a flowchart for illustrating Example (2) of the processing related to priority assignment in an embodiment of the present invention. The actions related to priority assignment can also be controlled based on whether there is DCI corresponding to SL transmission or UL transmission. That is, control can also be performed based on the scheduling type.

[0147] In step S701, when the DCI corresponding to the transmission is in both SL transmission and UL transmission, the terminal 20 enters step S702; when it is in either SL transmission or UL transmission, the terminal 20 enters step S703; when it is not in both SL transmission and UL transmission, the terminal 20 enters step S704.

[0148] The DCI corresponding to the transmission may refer to, for example, the transmission of DCI based on a dynamic grant, or the transmission of DCI for activation or deactivation based on a configured grant type 2. The transmission corresponding to DCI for activation based on a configured grant type 2 may also refer to the transmission of resources only in the initial period of periodically allocated resources. The transmission corresponding to DCI for deactivation based on a configured grant type 2 may also refer to, for example, the transmission of a confirmation response to the deactivation.

[0149] In step S702 , the terminal 20 may also perform any one of the following steps 1) to 4).

[0150] 1) Make Figure 15 The one with higher priority is sent first.

[0151] 2) Give priority to transmission after the time when the scheduling action is executed.

[0152] 3) Overlapping of transmissions is not envisaged.

[0153] 4) Prioritize the transmission set by the base station 10.

[0154] In step S703 , the terminal 20 may also execute any one of the following 1)-4).

[0155] 1) Make Figure 15 The one with higher priority is sent first.

[0156] 2) Always give priority to transmission corresponding to DCI.

[0157] 3) When the priority of SL transmission or UL transmission with corresponding DCI is lower (such as eMBB) and the priority of SL transmission or UL transmission without corresponding DCI is higher (such as URLLC), give priority to SL transmission or UL transmission with corresponding DCI.

[0158] 4) Do not assume overlap

[0159] In step S704 , the terminal 20 may also perform any one of the following 1)-3).

[0160] 1) Make Figure 15 The one with higher priority is sent first.

[0161] 2) Make UL transmission always prioritized.

[0162] 3) Determine the priority transmission based on the UE's installation (information indicating the priority may also be reported to the base station 10).

[0163] In addition, the condition for executing the above step S702, "a case where there is DCI corresponding to both SL transmission and UL transmission" can also be replaced by "a case where SL transmission and UL transmission are scheduled through dynamic authorization."

[0164] In addition, the condition for executing the above step S703 "the case where there is DCI corresponding to either SL transmission or UL transmission" can also be replaced by "the case where only either SL transmission or UL transmission is scheduled through dynamic authorization."

[0165] In addition, the condition for executing the above step S704, "there is no DCI corresponding to both SL transmission and UL transmission" can also be replaced by "SL transmission and UL transmission are set by setting authorization type 1 or setting authorization type 2."

[0166] In addition, "1) in step S702, step S703 and step S704 makes Figure 15 "Sending priority is given to actions with higher priority" can also be replaced by "performing at least one of "priority-related action A1", "priority-related action A2", "priority-related action A3", "priority-related action A4", "priority-related action A5" and "priority-related action A6"."

[0167] As described above, by executing the operation related to prioritization according to the presence or absence of DCI corresponding to transmission, efficient communication can be achieved by switching the operation related to prioritization between when the base station 10 is easy to control and when the control is not easy.

[0168] Figure 18 This is a flowchart for explaining Example (3) of the process related to priority assignment in the embodiment of the present invention. The action related to priority assignment can also be controlled based on whether the HARQ feedback sent by the SL is enabled (ON) or disabled (OFF).

[0169] In step S801 , the terminal 20 proceeds to step S802 if the HARQ feedback sent by the SL is enabled, and proceeds to step S803 if the HARQ feedback sent by the SL is disabled.

[0170] In step S802 , the terminal 20 may also perform any one of the following 1)-2).

[0171] 1) Make Figure 15 The one with higher priority is sent first.

[0172] 2) Make UL transmission always prioritized.

[0173] In step S803 , the terminal 20 may also execute any one of the following 1)-3).

[0174] 1) Make Figure 15 The one with higher priority is sent first.

[0175] 2) Make SL sending always prioritized.

[0176] 3) Determine the priority transmission based on the UE's installation (information indicating the priority may also be reported to the base station 10).

[0177] In addition, the determination of whether the HARQ feedback sent by the SL is enabled or disabled can be determined based on configuration or pre-configuration, or based on the notification content of the SCI.

[0178] In addition, regarding the judgment of whether the HARQ feedback sent by the SL in step S801 is enabled or disabled, the judgment can also be replaced by replacing "the case where HARQ feedback is enabled" with "is unicast or multicast option 2" and replacing "the case where HARQ feedback is disabled" with "is broadcast or multicast option 1".

[0179] In addition, "1) in step S802 and step S803 makes Figure 15 "Sending priority is given to actions with higher priority" can also be replaced by "performing at least one of "priority-related action A1", "priority-related action A2", "priority-related action A3", "priority-related action A4", "priority-related action A5" and "priority-related action A6"."

[0180] As described above, by switching the operation related to prioritization depending on whether or not HARQ-based retransmission is applied, efficient communication control corresponding to channel reliability can be performed.

[0181] According to the above-described embodiment, when SL transmission and UL transmission overlap, the terminal 20 can flexibly determine the priority of transmission based on parameters and communication settings while improving communication efficiency.

[0182] That is, in a wireless communication system, when a plurality of transmissions overlap, it is possible to determine a transmission to be prioritized.

[0183] (Device Structure)

[0184] Next, the functional configuration examples of the base station 10 and terminal 20 that perform the above-described processing and operations are described. The base station 10 and terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and terminal 20 may each include only a portion of the functions described in the embodiments.

[0185] <Base Station 10>

[0186] Figure 19 1 is a diagram showing an example of the functional configuration of the base station 10. Figure 19 As shown, the base station 10 includes a transmitting unit 110 , a receiving unit 120 , a setting unit 130 , and a control unit 140 . Figure 19 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be executed.

[0187] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 and wirelessly transmitting the signal. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-layer information from the received signals. Furthermore, the transmitter 110 includes a function of transmitting the NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, and the like to the terminal 20.

[0188] The setting unit 130 stores pre-set setting information and various setting information to be sent to the terminal 20 in a storage device, and reads the setting information from the storage device as needed. The content of the setting information is, for example, information related to the setting of D2D communication.

[0189] As described in the embodiments, the control unit 140 performs processing related to the configuration for the terminal 20 to perform D2D communication. Furthermore, the control unit 140 transmits the schedule for D2D communication and DL communication to the terminal 20 via the transmission unit 110. Furthermore, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the reception unit 120. Functional units related to signal transmission within the control unit 140 may be included in the transmission unit 110, while functional units related to signal reception within the control unit 140 may be included in the reception unit 120.

[0190] <Terminal 20>

[0191] Figure 20 2 is a diagram showing an example of the functional structure of the terminal 20. Figure 20 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 20 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be executed.

[0192] The transmitting unit 210 generates a transmission signal based on the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and obtains higher-layer signals from the received physical layer signals. In addition, the receiving unit 220 has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals transmitted from the base station 10. In addition, for example, as D2D communication, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0193] The configuration unit 230 stores various configuration information received by the receiving unit 220 from the base station 10 or the terminal 20 in a storage device and reads it from the storage device as needed. Furthermore, the configuration unit 230 also stores pre-set configuration information. This configuration information may include, for example, information related to D2D communication configuration.

[0194] As described in the embodiment, the control unit 240 controls D2D communication with other terminals 20. In addition, the control unit 240 performs processing related to HARQ of D2D communication and DL communication. In addition, the control unit 240 sends information related to HARQ responses of D2D communication and DL communication scheduled from the base station 10 to the base station 10. In addition, the control unit 240 can also schedule D2D communication for other terminals 20. In addition, the control unit 240 can autonomously select resources used for D2D communication from the resource selection window. In addition, the control unit 240 performs control in the case where UL transmission and SL transmission compete. The functional units related to signal transmission in the control unit 240 can also be included in the transmitting unit 210, and the functional units related to signal reception in the control unit 240 can also be included in the receiving unit 220.

[0195] (Hardware Structure)

[0196] The block diagram used in the description of the above embodiment ( Figure 19 and Figure 20 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0197] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0198] For example, the base station 10 , the terminal 20 , and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 21This figure shows an example of the hardware configuration of a base station 10 and a terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 described above can also 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, and the like.

[0199] In the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0200] The various functions in the base station 10 and the terminal 20 are implemented by reading predetermined software (programs) into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0201] Processor 1001 controls the entire computer by, for example, running an operating system. Processor 1001 may also be comprised of a central processing unit (CPU) that includes interfaces with peripheral devices, a control device, a computing device, registers, and the like. For example, control unit 140 and control unit 240 described above may also be implemented by processor 1001.

[0202] In addition, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes based on the program. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiment is used. For example, Figure 19 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed in the processor 1001. Figure 20 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Regarding the various processes described above, although they are described as being executed by a single processor 1001, they can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented on one or more chips. Furthermore, the program can be transmitted from a network via a telecommunications line.

[0203] The storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). The storage device 1002 may also be referred to as a register, cache, or main memory (main storage device). The storage device 1002 can store executable programs (program code), software modules, and the like for implementing the communication method according to one embodiment of the present disclosure.

[0204] The auxiliary storage device 1003 is a computer-readable recording medium, and can be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, etc. The above-mentioned storage medium can be, for example, a database, a server, or other appropriate medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0205] Communication device 1004 is hardware (a transceiver) used to communicate between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network card, or communication module. Communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, communication device 1004 may also implement a transceiver antenna, an amplifier, a transceiver, a transmission path interface, and the like. The transceiver may also be physically or logically separated from the transmitter and receiver.

[0206] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0207] Furthermore, the processor 1001, the storage device 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between devices.

[0208] Furthermore, the base station 10 and the terminal 20 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 may implement some or all of the functional blocks using this hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0209] (Summary of Implementation Methods)

[0210] As described above, according to an embodiment of the present invention, there is provided a terminal comprising: a control unit which determines which transmission to give priority when a first transmission to other terminals and a second transmission to a base station overlap at least in the time domain; and a transmission unit which performs power control or transmission control of the first transmission and the second transmission based on the decision, the control unit changing the control related to the determination of the priority of the transmission based on settings related to the communication.

[0211] With the above configuration, when SL and UL transmissions overlap, terminal 20 can flexibly prioritize transmissions based on parameters and communication settings, improving communication efficiency. In other words, in a wireless communication system, when multiple transmissions overlap, it is possible to prioritize the transmission.

[0212] The communication-related settings may also be one or more parameters indicating the priority between the first transmission, the priority between the second transmission, and the priority for the first transmission. With this configuration, when SL transmission and UL transmission overlap, the terminal 20 can flexibly determine the priority of transmission based on the parameters and communication settings, thereby improving communication efficiency.

[0213] The multiple parameters may also be composed of a first parameter and a second parameter having a lower priority than the first parameter, the priority between the second transmissions includes the first priority and the second priority having a lower priority than the first priority, and the control unit determines the transmission with a lower priority in the order shown in 1)-5) below.

[0214] 1) The first transmission having a higher priority than the first parameter

[0215] 2) The second transmission with the first priority

[0216] 3) The first transmission having a lower priority than the first parameter and a higher priority than the second parameter

[0217] 4) The second transmission with the second priority

[0218] 5) The first transmission having a lower priority than the second parameter

[0219] According to this configuration, when SL transmission and UL transmission overlap, the terminal 20 can determine the priority of transmission flexibly and with improved communication efficiency based on parameters and communication settings.

[0220] The communication-related setting may also refer to whether there is downlink control information corresponding to the first transmission or the second transmission. According to this configuration, when SL transmission and UL transmission overlap, the terminal 20 can flexibly determine the transmission priority based on the communication setting to improve communication efficiency.

[0221] The communication-related configuration may also refer to whether to apply HARQ (Hybrid Automatic Repeat Request) feedback to the first transmission. With this configuration, when SL transmission and UL transmission overlap, the terminal 20 can flexibly determine the transmission priority based on the communication configuration to improve communication efficiency.

[0222] In addition, according to an embodiment of the present invention, a communication method is provided, in which the terminal performs the following steps: a control step of determining which transmission to give priority when a first transmission to other terminals and a second transmission to a base station overlap at least in the time domain; and a transmission step of performing power control or transmission control of the first transmission and the second transmission based on the decision, the control step including a step of changing control related to the determination of the priority of transmission based on communication-related settings.

[0223] With the above configuration, when SL and UL transmissions overlap, terminal 20 can flexibly prioritize transmissions based on parameters and communication settings, improving communication efficiency. In other words, in a wireless communication system, when multiple transmissions overlap, it is possible to prioritize the transmission.

[0224] (Supplementary Implementation Methods)

[0225] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various variations, modifications, substitutions, and replacements. Specific numerical examples are used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate value may be used. The distinction between the items in the above description is not essential to the present invention. Matters recorded in two or more items may be combined and used as needed, and matters recorded in one item may be applied to matters recorded 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 actions of multiple functional units may be performed by a single physical component, or the actions of one functional unit may be performed by multiple physical components. Regarding the processing procedures described in the embodiments, the order of processing may be reversed if there is no contradiction. For the convenience of explaining the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices may also be implemented using hardware, software, or a combination thereof. The software that operates by the processor of the base station 10 according to the embodiment of the present invention and the software that operates by the processor of the terminal 20 according to the embodiment of the present invention can also 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 and any other appropriate storage medium.

[0226] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information can be implemented through physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0227] Each form / embodiment described in this disclosure may also be applied to at least one of 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), CDMA 2000, 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), systems using other appropriate systems, and next-generation systems derived therefrom. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0228] The processing procedures, timings, and flows of each form / implementation described in this specification may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0229] In this specification, specific operations performed by base station 10 may also be performed by its upper node depending on the situation. In a network consisting of one or more network nodes including base station 10, various operations performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes other than base station 10 (e.g., MME or S-GW, but not limited to these). While the above example illustrates a single other network node other than base station 10, the other network node may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0230] The information or signals described in this disclosure can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0231] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0232] The determination in the present disclosure may be performed using a value represented by one bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values ​​(for example, comparison with a predetermined value).

[0233] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0234] Furthermore, software, commands, information, and the like 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 a wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0235] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0236] In addition, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0237] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0238] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values ​​relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0239] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ 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.

[0240] 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" are used interchangeably. Base stations are sometimes also referred to as macrocells, small cells, femtocells, and picocells.

[0241] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of the base station and base station subsystem that provide communication services within the coverage area.

[0242] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0243] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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 appropriate terms.

[0244] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, 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.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, 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.

[0245] In addition, the base station in the present disclosure can also be replaced by a user terminal. For example, regarding a structure in which the communication between the base station and the user terminal is replaced by the communication between multiple terminals 20 (for example, it can also be called D2D (Device-to-Device), V2X (Vehicle-to-Everything: vehicle to everything system), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it can also be set as a structure in which the terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0246] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may also have the functions of the user terminal described above.

[0247] As used in this disclosure, terms such as “determining” and “determining” sometimes also include a variety of actions. “Determining” and “judging” may, for example, include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (for example, searching in a table, database or other data structure), and ascertaining as matters that have been “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been “determined” or “determined”. In addition, “determining” and “resolving” may include matters such as selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined”. That is, "judgment" and "decision" can include any action that is considered to have been "judged" or "decided." In addition, "judgment (decision)" can also be replaced with "assuming," "expecting," "considering," etc.

[0248] The terms "connected", "coupled" or any variation of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include situations where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used instead of "connection". As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region and optical (visible and invisible) region may be used to "connect" or "couple" to each other.

[0249] The reference signal may be referred to as RS (Reference Signal) for short, or may be called a pilot signal depending on the applied standard.

[0250] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0251] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first element and a second element does not imply that only two elements can be used or that the first element must precede the second element in any manner.

[0252] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0253] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," are intended to be inclusive. Furthermore, the term "or" used in this disclosure does not mean an exclusive or.

[0254] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can be further composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0255] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may represent 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 structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0256] A 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. A slot may be a time unit based on a parameter set.

[0257] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0258] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0259] For example, a subframe can be called a Transmission Time Interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a mini-slot, or the like, rather than a subframe.

[0260] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each terminal 20 by allocating wireless resources (such as the frequency bandwidth and transmit power available to each terminal 20) in units of TTI. The definition of TTI is not limited to this.

[0261] The TTI can be the time unit for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0262] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit for scheduling. In addition, the number of time slots (the number of mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0263] A TTI with a time length of 1 ms may also be referred to as 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 time slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0264] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0265] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0266] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0267] In addition, one or more RBs may be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like.

[0268] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0269] A bandwidth part (BWP) (also known as a fractional bandwidth) can represent a subset of contiguous common resource blocks (RBs) used for a parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point of the carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0270] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for the terminal 20 within one carrier.

[0271] At least one of the set BWPs may be active, and it is not assumed that the terminal 20 transmits or receives predetermined signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0272] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0273] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include cases where the noun following the article is in a plural form.

[0274] In this disclosure, the phrase "A and B are different" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0275] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0276] In the present disclosure, SL transmission is an example of transmission to other terminals. UL transmission is an example of transmission to a base station. Parameter X is an example of a first parameter. Parameter Y is an example of a second parameter.

[0277] While the present disclosure has been described in detail above, it should 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 various modifications and variations 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 does not have any limiting meaning on the present disclosure.

[0278] Description of labels

[0279] 10: base station;

[0280] 110: Sending department;

[0281] 120: receiving unit;

[0282] 130: Setting department;

[0283] 140: Control Department;

[0284] 20: terminal;

[0285] 210: Sending department;

[0286] 220: receiving unit;

[0287] 230: Setting department;

[0288] 240: Control Department;

[0289] 1001: processor;

[0290] 1002: storage device;

[0291] 1003: auxiliary storage device;

[0292] 1004: Communication device;

[0293] 1005: input device;

[0294] 1006: Output device.

Claims

1. A terminal comprising: A control unit, which sets the priority order from high to low to be determined as follows: Indicates that the priority value is smaller than the first parameter of the side link transmission, Uplink transmission with 1st priority, sidelink transmission having a priority value smaller than a second parameter having a priority lower than the first parameter, uplink transmission having a second priority, A side link transmission indicating a priority value greater than the second parameter; and A transmitting unit performs both sidelink transmission and uplink transmission, or either one of the sidelink transmission and the uplink transmission, based on the determination.

2. A communication method for a terminal, comprising the following steps: When the sidelink transmission to other terminals and the uplink transmission to the base station overlap, the smaller the value indicating the priority, the higher the priority. The order of priority is determined from high to low as follows: Indicates that the priority value is smaller than the first parameter of the side link transmission, Uplink transmission with 1st priority, sidelink transmission having a priority value smaller than a second parameter having a priority lower than the first parameter, uplink transmission having a second priority, A side link transmission indicating a priority value greater than the second parameter; and Based on the determination, both the sidelink transmission and the uplink transmission, or either the sidelink transmission or the uplink transmission, are performed.

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