Terminal and communication method

Abstract

A terminal according to the present invention comprises: a control unit that, in a case where a first transmission for another terminal and a second transmission for a base station overlap each other at least in the time domain, determines which transmission should be given a higher priority; and a transmission unit that executes power control or transmission control of the first transmission and the second transmission on the basis of the determination, wherein the control unit changes controls related to determination of priority order of the transmissions on the basis of a setting related to communications.

Description

[Technical Field]

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

[0002] In LTE (Long Term Evolution) and successor systems to LTE (e.g., LTE-A (LTE Advanced) and NR (New Radio) (also known as 5G)), D2D (Device to Device) technology is being considered, which allows terminals to communicate directly with each other without going through a base station (e.g., Non-Patent Document 1).

[0003] D2D reduces traffic between terminals and base stations and enables communication between terminals even when the base station becomes unavailable due to a disaster or other reason. Although 3GPP (3rd Generation Partnership Project) refers to D2D as a "sidelink," the more general term D2D is used in this specification. However, in the description of the embodiments described below, sidelink is also used as needed.

[0004] D2D communication is broadly divided into D2D discovery (also referred to as D2D discovery) for discovering other terminals with which communication is possible, and D2D communication (also referred to as D2D direct communication, D2D communication, terminal-to-terminal direct communication, etc.) for direct communication between terminals. Hereinafter, when there is no particular distinction between D2D communication, D2D discovery, etc., they will be simply referred to as D2D. Furthermore, signals transmitted and received in D2D will be referred to as D2D signals. Various use cases for services related to Vehicle to Everything (V2X) in NR are being studied (for example, Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 36.211 V15.8.1(2020-01) [Non-patent document 2] 3GPP TR 22.886 V15.1.0(2017-03) Summary of the Invention [Problem to be solved by the invention]

[0006] In NR direct communication between terminals, when sidelink and uplink transmissions transmitted on different carriers overlap in the time domain, the terminal allocates more power to the transmission with higher priority. Furthermore, in some cases, the terminal may drop the sidelink transmission. However, it has not been specified which of the sidelink or uplink should be prioritized.

[0007] The present invention has been made in view of the above points, and has as its object to determine a transmission to be prioritized when multiple transmissions overlap in a wireless communication system. [Means for solving the problem]

[0008] According to the disclosed technology, The terminal includes: a control unit that, when a sidelink transmission to another terminal and an uplink transmission to a base station overlap, determines a higher priority as a smaller value representing the priority, and determines an order of priority from highest to lowest: a sidelink transmission whose priority representing value is smaller than a first parameter, an uplink transmission having the first priority, a sidelink transmission whose priority representing value is smaller than a second parameter, an uplink transmission having the second priority, and a sidelink transmission whose priority representing value is larger than the second parameter; and a transmission unit that performs both the sidelink transmission and the uplink transmission, or one of the sidelink transmission and the uplink transmission, based on the determination. . [Effects of the Invention]

[0009] According to the disclosed technology, in a wireless communication system, it is possible to determine which transmission has priority when multiple transmissions overlap. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram for explaining V2X. [Figure 2] FIG. 1 is a diagram for explaining an example (1) of a V2X transmission mode. [Figure 3] FIG. 10 is a diagram for explaining an example (2) of a V2X transmission mode. [Figure 4] FIG. 10 is a diagram illustrating an example (3) of a V2X transmission mode. [Figure 5] FIG. 10 is a diagram illustrating an example (4) of a V2X transmission mode. [Figure 6] FIG. 10 is a diagram illustrating an example (5) of a V2X transmission mode. [Figure 7] FIG. 1 is a diagram for explaining an example (1) of a V2X communication type. [Figure 8] FIG. 10 is a diagram for explaining an example (2) of a V2X communication type. [Figure 9] FIG. 10 is a diagram for explaining an example (3) of a V2X communication type. [Figure 10] FIG. 1 is a sequence diagram showing an operation example (1) of V2X. [Figure 11] FIG. 10 is a sequence diagram showing an operation example (2) of V2X. [Figure 12] FIG. 10 is a sequence diagram showing an operation example (3) of V2X. [Figure 13] FIG. 10 is a sequence diagram showing an operation example (4) of V2X. [Figure 14] 10 is a flowchart illustrating an example of a transmission process according to an embodiment of the present invention. [Figure 15] FIG. 10 is a diagram illustrating an example of priority order according to an embodiment of the present invention. [Figure 16] 1 is a flowchart illustrating an example (1) of a process related to prioritization in an embodiment of the present invention. [Figure 17] 10 is a flowchart illustrating an example (2) of a process relating to prioritization in the embodiment of the present invention. [Figure 18] 10 is a flowchart illustrating an example (3) of a process relating to prioritization in the embodiment of the present invention. [Figure 19] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 20] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 21] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

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

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are used as appropriate. However, the existing technologies are, for example, but not limited to, the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced, a system subsequent to LTE-Advanced (e.g., NR), or a wireless LAN (Local Area Network), unless otherwise specified.

[0013] 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 other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, when radio parameters and the like are "configured," it may mean that predetermined values are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Figure 1 is a diagram for explaining V2X. 3GPP is studying the realization of V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functions, and is currently working on specifications. As shown in Figure 1, V2X is part of ITS (Intelligent Transport Systems) and is a collective term for V2V (Vehicle to Vehicle), which refers to a form of communication between vehicles; V2I (Vehicle to Infrastructure), which refers to a form of communication between vehicles and roadside units (RSUs) installed on the side of the road; V2N (Vehicle to Network), which refers to a form of communication between vehicles and ITS servers; and V2P (Vehicle to Pedestrian), which refers to a form of communication between vehicles and mobile terminals carried by pedestrians.

[0016] Additionally, 3GPP is studying V2X using LTE or NR cellular communications and device-to-device communications. V2X using cellular communications is also called cellular V2X. NR V2X is being studied to achieve high capacity, low latency, high reliability, and quality of service (QoS) control.

[0017] It is expected that future studies of LTE or NR V2X will be conducted beyond the 3GPP specifications, including ensuring interoperability, reducing costs through implementation of higher layers, using or switching between multiple RATs (Radio Access Technologies), complying with regulations in each country, and methods for acquiring, distributing, managing databases, and using data from LTE or NR V2X platforms.

[0018] In the embodiments of the present invention, a communication device is mainly assumed to be mounted on a vehicle, but the embodiments of the present invention are not limited to this. For example, the communication device may be a terminal held by a person, a device mounted on a drone or an aircraft, a base station, an RSU, a relay station (relay node), a terminal with scheduling capability, etc.

[0019] Note that SL (Sidelink) may be distinguished from UL (Uplink) or DL (Downlink) based on any one or a combination of the following 1) to 4). SL may also be called by other names. 1) Time domain resource allocation 2) Frequency domain resource allocation 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmission power control

[0020] Furthermore, with respect to OFDM (Orthogonal Frequency Division Multiplexing) of SL or UL, any of CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform - Spread - OFDM), OFDM without transform precoding, or OFDM with transform precoding may be applied. Furthermore, SL may be operated in a multi-carrier environment.

[0021] In the LTE SL, Mode 3 and Mode 4 are defined for SL resource allocation to terminal 20. In Mode 3, transmission resources are dynamically allocated by DCI (Downlink Control Information) transmitted from base station 10 to terminal 20. Also, in Mode 3, SPS (Semi Persistent Scheduling) is possible. In Mode 4, terminal 20 autonomously selects transmission resources from a resource pool.

[0022] The term "slot" in the embodiments of the present invention may be interpreted as a symbol, a minislot, a subframe, a radio frame, or a TTI (Transmission Time Interval). The term "cell" in the embodiments of the present invention may be interpreted as 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.

[0023] FIG. 2 is a diagram illustrating an example of a V2X transmission mode (1). In the transmission mode of sidelink communication illustrated in FIG. 2, in step 1, the base station 10 transmits sidelink scheduling to the terminal 20A. Next, the terminal 20A transmits a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) to the terminal 20B based on the received scheduling (step 2). The transmission mode of sidelink communication illustrated in FIG. 2 may be referred to as sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, Uu-based sidelink scheduling is performed. Uu is a radio interface between a Universal Terrestrial Radio Access Network (UTRAN) and a User Equipment (UE). The transmission mode of sidelink communication illustrated in FIG. 2 may be referred to as sidelink transmission mode 1 in NR.

[0024] Fig. 3 is a diagram illustrating an example (2) of a V2X transmission mode. In the transmission mode of sidelink communication shown in Fig. 3, in step 1, the terminal 20A transmits the PSCCH and the PSSCH to the terminal 20B using autonomously selected resources. The transmission mode of sidelink communication shown in Fig. 3 may be referred to as sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, the UE itself performs resource selection.

[0025] FIG. 4 is a diagram illustrating an example of a V2X transmission mode (3). In the transmission mode of sidelink communication shown in FIG. 4, in step 1, the terminal 20A transmits the PSCCH and the PSSCH to the terminal 20B using autonomously selected resources. Similarly, the terminal 20B transmits the PSCCH and the PSSCH to the terminal 20A using autonomously selected resources (step 1). The transmission mode of sidelink communication shown in FIG. 4 may be referred to as a sidelink transmission mode 2a in NR. In sidelink transmission mode 2 in NR, the terminal 20 itself performs resource selection.

[0026] Fig. 5 is a diagram illustrating an example of a V2X transmission mode (4). In the transmission mode of sidelink communication shown in Fig. 5, in step 0, the base station 10 transmits a sidelink grant to the terminal 20A via RRC (Radio Resource Control) configuration. Subsequently, the terminal 20A transmits a PSSCH to the terminal 20B based on the received resource pattern (step 1). The transmission mode of sidelink communication shown in Fig. 5 may be referred to as a sidelink transmission mode 2c in NR.

[0027] Fig. 6 is a diagram illustrating an example (5) of a V2X transmission mode. In the transmission mode of sidelink communication shown in Fig. 6, in step 1, terminal 20A transmits sidelink scheduling to terminal 20B via a PSCCH. Subsequently, terminal 20B transmits a PSSCH to terminal 20A based on the received scheduling (step 2). The transmission mode of sidelink communication shown in Fig. 6 may be referred to as a sidelink transmission mode 2d in NR.

[0028] Fig. 7 is a diagram for explaining an example (1) of a V2X communication type. The sidelink communication type shown in Fig. 7 is unicast. Terminal 20A transmits a PSCCH and a PSSCH to terminal 20. In the example shown in Fig. 7, terminal 20A unicasts to terminal 20B and also unicasts to terminal 20C.

[0029] Fig. 8 is a diagram illustrating an example (2) of a V2X communication type. The sidelink communication type shown in Fig. 8 is groupcast. Terminal 20A transmits PSCCH and PSSCH to a group to which one or more terminals 20 belong. In the example shown in Fig. 8, the group includes terminal 20B and terminal 20C, and terminal 20A performs groupcast to the group.

[0030] FIG. 9 is a diagram for explaining an example (3) of a V2X communication type. The sidelink communication type shown in FIG. 9 is broadcast. Terminal 20A transmits PSCCH and PSSCH to one or more terminals 20. In the example shown in FIG. 9, terminal 20A broadcasts to terminal 20B, terminal 20C, and terminal 20D. Note that terminal 20A shown in FIGS. 7 to 9 may be referred to as a header UE (header-UE).

[0031] In addition, it is expected that NR-V2X will support hybrid automatic repeat request (HARQ) for sidelink unicast and groupcast. Furthermore, NR-V2X will define sidelink feedback control information (SFCI) including an HARQ response. Furthermore, it is being considered to transmit the SFCI via a physical sidelink feedback channel (PSFCH).

[0032] In the following description, the PSFCH is used for transmitting the HARQ-ACK on the side link, but this is just an example. For example, the HARQ-ACK may be transmitted on the side link using the PSCCH, the PSSCH, or another channel.

[0033] For convenience, information reported by terminal 20 in HARQ will be generally referred to as HARQ-ACK below. This HARQ-ACK may also be referred to as HARQ-ACK information. More specifically, a codebook applied to HARQ-ACK information reported from terminal 20 to base station 10 or the like will be referred to as a HARQ-ACK codebook. The HARQ-ACK codebook defines the bit string of the HARQ-ACK information. Note that in addition to ACK, NACK is also transmitted using "HARQ-ACK".

[0034] Fig. 10 is a diagram showing an example (1) of the configuration and operation of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 10, the wireless communication system according to the embodiment of the present invention has terminal 20A and terminal 20B. Although in reality, many user devices exist, Fig. 10 shows terminal 20A and terminal 20B as examples.

[0035] Hereinafter, when there is no particular distinction between terminals 20A, 20B, etc., they will be simply referred to as "terminal 20" or "user device." While Fig. 10 shows an example in which terminal 20A and terminal 20B are both within the coverage of a cell, the operation in the embodiment of the present invention can also be applied to a case in which terminal 20B is outside the coverage.

[0036] As described above, in this embodiment, the terminal 20 is, for example, a device mounted on a vehicle such as an automobile, and has a cellular communication function as a UE in LTE or NR, and a sidelink function. The terminal 20 may be a general mobile terminal (such as a smartphone). The terminal 20 may also be an RSU. The RSU may be a UE-type RSU having the function of a UE, or a gNB-type RSU having the function of a base station device.

[0037] The terminal 20 does not need to be a device in a single housing. For example, even if various sensors are distributed and arranged inside a vehicle, the terminal 20 is a device including the various sensors.

[0038] Furthermore, the processing of sidelink transmission data in terminal 20 is basically the same as the processing of UL transmission in LTE or NR. For example, terminal 20 scrambles and modulates codewords of transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signals) to one or two layers, and performs precoding. Then, terminal 20 maps the precoded complex-valued symbols to resource elements to generate transmission signals (e.g., complex-valued time-domain SC-FDMA signals), and transmits them from each antenna port.

[0039] Note that the base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling communication of the terminal 20 in this embodiment (e.g., resource pool setting, resource allocation, etc.). The base station 10 may also be an RSU (gNB type RSU).

[0040] Furthermore, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by terminal 20 for SL or UL may be OFDMA, SC-FDMA, or another signal waveform.

[0041] In step S101, the terminal 20A autonomously selects resources to be used for the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may be set to the terminal 20 by the base station 10.

[0042] In steps S102 and S103, terminal 20A transmits SCI (Sidelink Control Information) via PSCCH and transmits SL data via PSSCH using the resources autonomously selected in step S101. For example, terminal 20A may transmit SCI (PSCCH) using the same time resource as the PSSCH and a frequency resource adjacent to the frequency resource of the PSSCH.

[0043] Terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received via the PSCCH may include information on the PSFCH resource used by terminal 20B to transmit a HARQ-ACK in response to reception of the data. Terminal 20A may transmit information on autonomously selected resources by including it in the SCI.

[0044] In step S104, the terminal 20B uses the PSFCH resource specified in the received SCI to transmit a HARQ-ACK for the received data to the terminal 20A.

[0045] In step S105, if the HARQ-ACK received in step S104 indicates a request for retransmission, that is, if it is a NACK (negative acknowledgement), the terminal 20A retransmits the PSCCH and PSSCH to the terminal 20B. The terminal 20A may retransmit the PSCCH and PSSCH using autonomously selected resources.

[0046] If HARQ control is not performed, steps S104 and S105 do not have to be performed.

[0047] 11 is a diagram showing an example (2) of the configuration and operation of a wireless communication system according to an embodiment of the present invention. Blind retransmission without HARQ control may be performed to improve the success rate or reach of transmission.

[0048] In step S201, the terminal 20A autonomously selects resources to be used for the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window may be set to the terminal 20 by the base station 10.

[0049] In steps S202 and S203, terminal 20A transmits SCI over PSCCH and transmits SL data over PSSCH using the resources autonomously selected in step S201. For example, terminal 20A may transmit SCI (PSCCH) using the same time resource as the PSSCH and a frequency resource adjacent to the frequency resource of the PSSCH.

[0050] In step S204, the terminal 20A uses the resource autonomously selected in step S201 to retransmit the SCI via the PSCCH and the SL data via the PSSCH to the terminal 20B. The retransmission in step S204 may be performed multiple times.

[0051] If blind retransmission is not performed, step S204 does not have to be performed.

[0052] 12 is a diagram showing an example (3) of the configuration and operation of a wireless communication system according to an embodiment of the present invention. The base station 10 may perform sidelink scheduling. That is, the base station 10 may determine sidelink resources to be used by the terminal 20 and transmit information indicating these resources to the terminal 20. Furthermore, when HARQ control is applied, the base station 10 may transmit information indicating PSFCH resources to the terminal 20.

[0053] In step S301, base station 10 performs SL scheduling by transmitting DCI (Downlink Control Information) via PDCCH to terminal 20 A. Hereinafter, for convenience, DCI for SL scheduling will be referred to as SL scheduling DCI.

[0054] Also, in step S301, it is assumed that the base station 10 also transmits DCI for DL scheduling (which may also be called DL allocation) to the terminal 20A via the PDCCH. Hereinafter, for convenience, DCI for DL scheduling will be called DL scheduling DCI. The terminal 20A that has received the DL scheduling DCI receives DL data via the PDSCH using resources specified in the DL scheduling DCI.

[0055] In steps S302 and S303, terminal 20A transmits SCI (Sidelink Control Information) via PSCCH using resources specified in the SL scheduling DCI, and transmits SL data via PSSCH. Note that only the resources of the PSSCH may be specified in the SL scheduling DCI. In this case, for example, terminal 20A may transmit SCI (PSCCH) using the same time resource as the time resource of the PSSCH and a frequency resource adjacent to the frequency resource of the PSSCH.

[0056] The terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from the terminal 20A. The SCI received via the PSCCH includes information on the PSFCH resource used by the terminal 20B to transmit a HARQ-ACK in response to reception of the data.

[0057] The resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the resource information from the DL scheduling DCI or SL scheduling DCI and includes it in the SCI. Alternatively, the resource information may not be included in the DCI transmitted from the base station 10, and the terminal 20A may autonomously include the resource information in the SCI and transmit it.

[0058] In step S304, the terminal 20B uses the PSFCH resource specified in the received SCI to transmit a HARQ-ACK for the received data to the terminal 20A.

[0059] In step S305, the terminal 20A transmits a HARQ-ACK using a PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or the SL scheduling DCI) at a timing (for example, slot-by-slot timing) specified by the DL scheduling DCI (or the SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The codebook for the HARQ-ACK may include the HARQ-ACK received from the terminal 20B and a HARQ-ACK for DL data. However, if no DL data is allocated, for example, a HARQ-ACK for DL data is not included.

[0060] If HARQ control is not performed, steps S304 and S305 do not have to be performed.

[0061] FIG. 13 is a diagram showing an operation example (4) according to an embodiment of the present invention. As described above, in the NR sidelink, it is supported that an HARQ response is transmitted on a PSFCH. Note that the PSFCH format can use a format similar to PUCCH (Physical Uplink Control Channel) format 0. That is, the PSFCH format may be a sequence-based format in which the PRB (Physical Resource Block) size is 1 and ACKs and NACKs are identified by differences in sequences. The PSFCH format is not limited to this. PSFCH resources may be allocated to the last symbol or the last several symbols of a slot. Furthermore, a periodicity N is set or predefined for the PSFCH resources. The periodicity N may be set or predefined on a slot-by-slot basis.

[0062] In Fig. 13, the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH may be placed in the first symbol of a slot, or in multiple symbols from the first, or in multiple symbols from a symbol other than the first. The PSFCH may be placed in the last symbol of a slot, or in multiple symbols from the last symbol of a slot. In the example shown in Fig. 13, three subchannels are configured in the resource pool, and two PSFCHs are placed three slots after the slot in which the PSSCH is placed. The arrow from the PSSCH to the PSFCH indicates an example of a PSFCH associated with the PSSCH.

[0063] When the HARQ response in NR-V2X groupcast is option 2, in which an ACK or NACK is transmitted, it is necessary to determine the resources to be used for transmitting and receiving the PSFCH. As shown in FIG. 13, in step S401, terminal 20A, which is a transmitting terminal 20, performs groupcast via SL-SCH to terminals 20B, 20C, and 20D, which are receiving terminals 20. In the following step S402, terminal 20B uses PSFCH#B, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D to transmit a HARQ response to terminal 20A. Here, as shown in the example of FIG. 13, when the number of available PSFCH resources is smaller than the number of receiving terminals 20 belonging to the group, it is necessary to determine how to allocate the PSFCH resources. Note that the transmitting terminal 20 may be aware of the number of receiving terminals 20 in the groupcast.

[0064] Here, when SL transmission and UL transmission transmitted on different carriers overlap in the time domain, more power may be allocated to the transmission with higher priority. Also, in some cases, SL transmission may be dropped. Hereinafter, "overlap" refers mainly to overlapping of resources in the time domain, but "overlap" may also refer to overlapping of resources in at least one of the time domain, frequency domain, and code domain.

[0065] If simultaneous SL and UL transmission on different carriers is supported, power may be limited as shown in 1)-3) below.

[0066] 1) When SL transmission has priority over UL transmission, terminal 20 adjusts the UL transmission power before starting transmission so that the total transmission power in the overlapping portion does not exceed P_CMAX, where P_CMAX is the maximum transmission power of terminal 20.

[0067] 2) When UL transmission has priority over SL transmission, 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. 3) In the case of simultaneous SL and UL transmission, the SL transmit power is the same among the symbols used for actual PSCCH / PSSCH transmission within a slot. When there is a UL with higher priority than the SL and the terminal 20 cannot maintain the same SL transmit power in those symbols, some symbols of the PSCCH / PSSCH transmission may be dropped. The selection of the dropped symbols, including overlapping symbols, may be UE implementation dependent.

[0068] If simultaneous SL and UL transmissions exceed the UE's capabilities, non-prioritized transmissions may be dropped. Furthermore, for simultaneous SL and UL transmissions, it may be determined when to prioritize which transmission, a processing time for terminal 20, a case where some symbols of UL transmissions are dropped, and an RF transition period may be specified.

[0069] The prioritization of SL and UL in LTE is as follows:

[0070] If the value representing the highest priority of an SL logical channel in a MAC-PDU (Medium Access Control - Protocol data unit) is smaller than the set threshold (i.e., if the priority is higher than the threshold), the SL is given priority over the UL, and if the value representing the highest priority of an SL logical channel in a MAC-PDU is larger than the set threshold or if no threshold is set, the UL is given priority over the SL.

[0071] The prioritization of UL and SL transmissions in NR may be determined based on at least one of a)-m) below.

[0072] a) Upper layer parameters b) PHY Layer SL Priority c) PHY Layer UL Priority d) Upper layer SL priority e) Upper Layer UL Priority f) SL channel or signal g) UL channel or signal h) SL resource allocation (RA) mode i) SL scheduling type j) UL Scheduling Type k) Scheduling Timing l) Presence or absence of HARQ feedback m) HARQ feedback type

[0073] 14 is a flowchart illustrating an example of a transmission process according to an embodiment of the present invention. In step S501, terminal 20 detects that UL transmission and SL transmission overlap. Subsequently, terminal 20 determines the priority of UL transmission and the priority of SL transmission (S502). Subsequently, terminal 20 allocates more power to the transmission with a higher priority out of UL transmission and SL transmission (S503). Furthermore, terminal 20 may drop the transmission with a lower priority. Note that step S502 may be executed in advance before step S501.

[0074] 15 is a diagram showing an example of priority order in an embodiment of the present invention. The priority order may be determined by parameters X and Y indicating the priority in SL transmission. The value of parameter X may be smaller than the value of parameter Y, meaning that the priority indicated by parameter X is higher than the priority indicated by parameter Y. Parameters X and Y may be parameters of an upper layer or may be parameters of a PHY layer.

[0075] Furthermore, priorities between SL transmissions may be set, and priorities between UL transmissions may be set. The priorities between SL transmissions and the priorities between UL transmissions may be signaled by a higher layer or may be signaled by a PHY layer. For example, the value representing the priority between SL transmissions may be set to a value smaller than parameter X (i.e., a priority higher than the priority indicated by parameter X), a value equal to or greater than parameter X and smaller than parameter Y (i.e., a priority lower than the priority indicated by parameter X and higher than the priority indicated by parameter Y), or a value equal to or greater than parameter Y (i.e., a priority lower than the priority indicated by parameter Y). For example, the priorities between UL transmissions may be set so that PUSCH / PUSCH such as PRACH and URLLC (Ultra reliable low latency) is "high" and PUSCH / PUSCH such as SRS (Sounding reference signal) and eMBB (enhanced Mobile Broadband) is "low". Note that "higher than or equal to" and "higher than or equal to" and "lower than or equal to" may be interchangeable. Hereinafter, "priority X" may refer to parameter X or the priority indicated by parameter X. The "priority" Y may refer to the parameter Y or may refer to the priority indicated by the parameter Y.

[0076] In step S502 shown in Fig. 14, it may be determined that "PSSCH / PSSCH / PSFCH having a higher priority than priority X" has the highest priority, as shown in Fig. 15. Note that "PSSCH / PSSCH / PSFCH" means at least one channel of PSSCH, PSSCH, and PSFCH.

[0077] 15, the channel with the next highest priority after "PSSCH / PSSCH / PSFCH with a higher priority than priority X" may be "PRACH and PUSCH / PUCCH with a high priority (for example, URLLC)." Note that "PUSCH / PUCCH" means at least one channel of PUSCH and PUCCH.

[0078] As shown in FIG. 15, the channel with the next highest priority after "PRACH and high-priority (e.g., URLLC) PUSCH / PUCCH" may be "PSCCH / PSSCH / PSFCH with a lower priority than priority X and a higher priority than priority Y."

[0079] As shown in FIG. 15, the channel with the next highest priority after "PSCCH / PSSCH / PSFCH with a lower priority than priority X and a higher priority than priority Y" may be "SRS (Sounding reference signal) and low-priority (e.g., eMBB) PUSCH / PUCCH."

[0080] As shown in FIG. 15, the channel with the next highest priority after "SRS and low-priority (e.g., eMBB) PUSCH / PUCCH" may be "PSCCH / PSSCH / PSFCH with a lower priority than priority Y."

[0081] Hereinafter, the operation of comparing SL transmission and UL transmission at least once based on the priorities shown in FIG. 15 to determine which transmission has priority will be referred to as "operation A1 related to priority."

[0082] 15, if parameter X is not set, "PRACH and PUSCH / PUCCH with high priority (e.g., URLLC)" may always be prioritized. Hereinafter, this operation will be referred to as "operation A2 related to priority."

[0083] If parameter Y is not set in addition to the priorities shown in Fig. 15, the priority of "PSCCH / PSSCH / PSFCH lower in priority than priority X" may always be lowered. That is, "PSCCH / PSSCH / PSFCH lower in priority than priority X" may have a lower priority than "SRS and PUSCH / PUCCH with low priority (e.g., eMBB)." Hereinafter, this operation is referred to as "operation A3 related to priority."

[0084] If neither parameter X nor parameter Y is set, either UL transmission or SL transmission may always be prioritized. Hereinafter, this operation will be referred to as "operation A4 related to priority order."

[0085] The priority of the PSFCH may be the priority indicated in the SCI corresponding to the PSSCH corresponding to the PSFCH, or the priority indicated in the MAC-PDU transmitted on the PSSCH. Hereinafter, this operation will be referred to as "operation A5 related to priority."

[0086] In addition to the priorities shown in Fig. 15, specific channels or signals may be prioritized based on different rules. Hereinafter, this operation will be referred to as "priority-related operation A6". For example, PRACH may always be prioritized. For example, PUCCH / PUSCH with HARQ-ACK may always be prioritized. For example, PUCCH / PUSCH with SR / CSI may always be deprioritized. For example, SRS may always be deprioritized. For example, PSFCH may always be deprioritized.

[0087] By determining the priority order as described above, it is possible to flexibly set priorities according to the SL and UL traffic types, and also to set priorities for channels or signals based on the importance of the traffic types according to the communication conditions.

[0088] 16 is a flowchart illustrating an example (1) of a process related to prioritization in an embodiment of the present invention. The operation related to prioritization may be controlled according to the SL resource allocation mode.

[0089] In step S601, if the SL resource allocation mode is mode 1, the terminal 20 proceeds to step S602, and if the SL resource allocation mode is mode 2, the terminal 20 proceeds to step S603.

[0090] In step S602, the terminal 20 may perform any one of the following 1) to 4). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) The transmission that is performed later in the scheduling process is given priority. 3) No overlapping of transmissions is assumed. 4) Priority is given to the prioritized transmission set by the base station 10.

[0091] On the other hand, in step S603, the terminal 20 may execute any one of the following 1) to 4). 1) Transmission with a higher priority in Fig. 15 is given priority. The setting of 1) in step S602 may be changed by changing the parameter X or the parameter Y, for example. 2) When UL transmission has high priority (e.g., URLLC), UL transmission is prioritized, and when UL transmission has low priority (e.g., eMBB), SL transmission is prioritized. 3) UL transmission is always given priority. 4) Determine the transmission priority based on the UE implementation (may report information indicating the priority order to the base station 10).

[0092] In addition, in steps S602 and S603, "1) Give priority to transmissions with higher priority in Figure 15" may be replaced with "Perform at least one of 'Priority-related operation A1', 'Priority-related operation A2', 'Priority-related operation A3', 'Priority-related operation A4', 'Priority-related operation A5' and 'Priority-related operation A6'."

[0093] Note that SL resource allocation mode 1 may be an SL transmission mode in which the base station 10 performs scheduling, and SL resource allocation mode 2 may be an SL transmission mode in which the terminal 20 autonomously selects resources.

[0094] As described above, by performing operations related to prioritization based on the SL resource allocation mode, it is possible to operate under optimal rules whether the base station 10 schedules SL transmissions or not. Furthermore, in the case of SL resource allocation mode 2 in which the terminal 20 autonomously selects resources, giving priority to the UL can improve resource usage efficiency.

[0095] 17 is a flowchart for explaining an example (2) of a process related to prioritization in an embodiment of the present invention. The operation related to prioritization may be controlled depending on whether or not DCI corresponding to SL transmission or UL transmission exists. In other words, it may be controlled based on the scheduling type.

[0096] In step S701, if the DCI corresponding to the transmission is present in both SL transmission and UL transmission, the terminal 20 proceeds to step S702, if it is present in either SL transmission or UL transmission, the terminal 20 proceeds to step S703, and if it is not present in both SL transmission and UL transmission, the terminal 20 proceeds to step S704.

[0097] The presence of a DCI corresponding to a transmission may be, for example, a transmission by a DCI of a dynamic grant, or a transmission by a DCI of activation or deactivation of a configured grant type 2. A transmission corresponding to a DCI of activation of a configured grant type 2 may be only a transmission using resources in the first cycle of periodically allocated resources. A transmission corresponding to a DCI of deactivation of a configured grant type 2 may be, for example, a transmission of an acknowledgement response to the deactivation.

[0098] In step S702, the terminal 20 may perform any one of the following 1) to 4). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) The transmission that is performed later in the scheduling process is given priority. 3) No overlapping of transmissions is assumed. 4) Transmission set by the base station 10 is given priority.

[0099] In step S703, the terminal 20 may execute any one of the following 1) to 4). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) Always prioritize transmissions that respond to DCI. 3) If SL transmission or UL transmission with corresponding DCI has low priority (e.g., eMBB) and SL transmission or UL transmission without corresponding DCI has high priority (e.g., URLLC), prioritize the SL transmission or UL transmission with corresponding DCI. 4) Do not assume overlap

[0100] In step S704, the terminal 20 may perform any one of the following 1) to 3). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) UL transmission is always given priority. 3) Determine the transmission priority based on the UE implementation (may report information indicating the priority order to the base station 10).

[0101] Note that the condition for executing step S702 above, "when there is DCI corresponding to both SL transmission and UL transmission", may be replaced with "when SL transmission and UL transmission are scheduled by dynamic grant".

[0102] In addition, the condition for executing the above step S703, "when there is DCI corresponding to either SL transmission or UL transmission," may be replaced with "when only either SL transmission or UL transmission is scheduled by dynamic grant."

[0103] In addition, the condition for executing the above step S704, "when there is no DCI corresponding to both SL transmission and UL transmission", may be replaced with "when SL transmission and UL transmission are configured by configured grant type 1 or configured grant type 2".

[0104] In addition, in steps S702, S703, and S704, "1) Give priority to transmissions with higher priority in Figure 15" may be replaced with "Perform at least one of 'Priority-related operation A1', 'Priority-related operation A2', 'Priority-related operation A3', 'Priority-related operation A4', 'Priority-related operation A5', and 'Priority-related operation A6'."

[0105] As described above, by performing operations related to prioritization depending on whether or not there is DCI corresponding to the transmission, it is possible to switch the operations related to prioritization depending on whether it is easy for the base station 10 to control the transmission or not, thereby realizing efficient communication.

[0106] 18 is a flowchart illustrating an example (3) of a process related to prioritization according to an embodiment of the present invention. The operation related to prioritization may be controlled depending on whether HARQ feedback for SL transmission is ON or OFF.

[0107] In step S801, if the HARQ feedback for SL transmission is ON, the terminal 20 proceeds to step S802, and if the HARQ feedback for SL transmission is OFF, the terminal 20 proceeds to step S803.

[0108] In step S802, the terminal 20 may execute either of the following 1)-2). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) UL transmission is always given priority.

[0109] In step S803, the terminal 20 may execute any one of the following 1) to 3). 1) Transmission with a higher priority in FIG. 15 is given priority. 2) SL transmission is always given priority. 3) Determine the transmission priority based on the UE implementation (may report information indicating the priority order to the base station 10).

[0110] In addition, the determination of whether HARQ feedback for SL transmission is ON or OFF may be made based on the configuration or pre-configuration, or may be made based on the notification content of the SCI.

[0111] In addition, with regard to the determination of whether the HARQ feedback for SL transmission in step S801 is ON or OFF, the determination may be such that "if HARQ feedback is ON" is replaced with "unicast or groupcast option 2" and "if HARQ feedback is OFF" is replaced with "broadcast or groupcast option 1."

[0112] In addition, in steps S802 and S803, "1) Give priority to transmissions with higher priority in Figure 15" may be replaced with "Perform at least one of 'Operation A1 related to priority', 'Operation A2 related to priority', 'Operation A3 related to priority', 'Operation A4 related to priority', 'Operation A5 related to priority', and 'Operation A6 related to priority'."

[0113] As described above, by switching the operation relating to prioritization depending on whether or not retransmission by HARQ is applied, efficient communication control according to the reliability of the channel becomes possible.

[0114] According to the above-described embodiment, when SL transmission and UL transmission overlap, the terminal 20 can determine the transmission priority flexibly and to improve communication efficiency based on parameters and communication settings.

[0115] That is, in a wireless communication system, it is possible to determine which transmission has priority when multiple transmissions overlap.

[0116] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0117] <Base station 10> Fig. 19 is a diagram showing an example of the functional configuration of base station 10. As shown in Fig. 19, base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 19 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiments of the present invention.

[0118] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, a DL reference signal, etc. to the terminal 20.

[0119] The setting unit 130 stores in a storage device setting information that is set in advance and various setting information to be transmitted to the terminal 20, and reads out from the storage device as needed. The content of the setting information is, for example, information related to the setting of D2D communication.

[0120] As described in the embodiments, the control unit 140 performs processing related to settings for the terminal 20 to perform D2D communication. Furthermore, the control unit 140 transmits scheduling 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. A functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

[0121] <Terminal 20> Fig. 20 is a diagram showing an example of the functional configuration of terminal 20. As shown in Fig. 20, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 20 is merely an example. The names of the functional divisions and functional units may be any names as long as they can execute the operations related to the embodiment of the present invention.

[0122] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires a higher layer signal from the received physical layer signal. The receiver 220 also has a function of receiving an NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signal, reference signal, or the like transmitted from the base station 10. For example, the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), or the like to another terminal 20 as D2D communication, and the receiver 220 receives the PSCCH, PSSCH, PSDCH, or PSBCH, or the like, from the other terminal 20.

[0123] The setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the receiving unit 220 in a storage device and reads it from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The content of the setting information is, for example, information related to the setting of D2D communication.

[0124] As described in the embodiments, the control unit 240 controls D2D communication with other terminals 20. The control unit 240 also performs processing related to HARQ for D2D communication and DL communication. The control unit 240 also transmits to the base station 10 information related to HARQ responses for D2D communication and DL communication to other terminals 20 scheduled by the base station 10. The control unit 240 may also schedule D2D communication for other terminals 20. The control unit 240 may also autonomously select resources to be used for D2D communication from a resource selection window. The control unit 240 also performs control when there is contention between UL transmission and SL transmission. A functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.

[0125] (Hardware configuration) The block diagrams (FIGS. 19 and 20) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0126] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0127] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 21 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0128] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0129] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0130] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0131] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 19 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 20 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0132] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0133] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0134] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0135] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0136] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0137] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0138] (Summary of the embodiment) As described above, according to an embodiment of the present invention, a terminal is provided which has a control unit that determines which transmission to prioritize when a first transmission to another terminal 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 determination, and the control unit changes control related to the determination of the transmission priority based on communication-related settings.

[0139] With the above configuration, when SL transmission and UL transmission overlap, terminal 20 can flexibly determine the priority of transmissions based on parameters and communication settings so as to improve communication efficiency. That is, in a wireless communication system, when multiple transmissions overlap, it is possible to determine which transmission should be prioritized.

[0140] The communication settings may be the priority of the first transmission, the priority of the second transmission, and one or more parameters indicating the priority for the first transmission. With this configuration, when SL transmission and UL transmission overlap, terminal 20 can determine the transmission priority flexibly and to improve communication efficiency based on the parameters and communication settings.

[0141] The plurality of parameters may be composed of a first parameter and a second parameter having a lower priority than the first parameter, and the priority between the second transmissions may include a first priority and a second priority lower than the first priority, and the control unit may determine that the transmission has a decreasing priority in the order shown below in 1)-5). 1) The first transmission having a higher priority than the first parameter. 2) the second transmission having the first priority; 3) the first transmission having a lower priority than the first parameter and a higher priority than the second parameter; 4) the second transmission having the second priority. 5) the first transmission having a lower priority than the second parameter; With this configuration, when SL transmission and UL transmission overlap, the terminal 20 can determine the transmission priority flexibly and in a manner that improves communication efficiency based on parameters and communication settings.

[0142] The communication setting may be whether or not there is downlink control information corresponding to the first transmission or the second transmission. With this configuration, when SL transmission and UL transmission overlap, terminal 20 can determine the transmission priority flexibly based on the communication setting so as to improve communication efficiency.

[0143] The communication setting may be whether or not hybrid automatic repeat request (HARQ) feedback is applied to the first transmission. With this configuration, when SL transmission and UL transmission overlap, terminal 20 can determine the transmission priority flexibly and to improve communication efficiency based on the communication setting.

[0144] Furthermore, according to an embodiment of the present invention, there is provided a communication method in which a terminal executes a control procedure for determining which transmission to prioritize when a first transmission to another terminal and a second transmission to a base station overlap at least in the time domain, and a transmission procedure for performing power control or transmission control of the first transmission and the second transmission based on the determination, and the control procedure includes a procedure for changing control related to the determination of the transmission priority based on communication-related settings.

[0145] With the above configuration, when SL transmission and UL transmission overlap, terminal 20 can flexibly determine the priority of transmissions based on parameters and communication settings so as to improve communication efficiency. That is, in a wireless communication system, when multiple transmissions overlap, it is possible to determine which transmission should be prioritized.

[0146] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0147] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0148] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0149] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0150] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0151] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0152] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0153] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0154] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0155] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0156] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0157] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0158] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0159] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0160] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0161] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0162] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of a base station and / or base station subsystem that provides communication service within this coverage.

[0163] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0164] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0165] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0166] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0167] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0168] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0169] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0170] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0171] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0172] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0173] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0174] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0175] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0176] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0177] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0178] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0179] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0180] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0181] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0182] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0183] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0184] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0185] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0186] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0187] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0188] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0189] 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.

[0190] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0191] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0192] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0193] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0194] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0195] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0196] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0197] In the present disclosure, SL transmission is an example of transmission to another terminal. 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.

[0198] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. 。 [Explanation of symbols]

[0199] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. When sidelink transmission to another terminal overlaps with uplink transmission to the base station, the smaller the priority value, the higher the priority. The order of priority is as follows: a sidelink transmission having a value representing a priority smaller than a first parameter; an uplink transmission having a first priority; a sidelink transmission having a value representing a priority that is smaller than a second parameter having a lower priority than the first parameter; an uplink transmission having a second priority; a sidelink transmission having a priority value greater than the second parameter; a control unit that determines a transmitter configured to perform both a sidelink transmission and an uplink transmission, or one of the sidelink transmission and the uplink transmission, based on the determination; A terminal comprising:

2. When sidelink transmission to another terminal overlaps with uplink transmission to the base station, the smaller the priority value, the higher the priority. The order of priority is as follows: a sidelink transmission having a value representing a priority smaller than a first parameter; an uplink transmission having a first priority; a sidelink transmission having a value representing a priority that is smaller than a second parameter having a lower priority than the first parameter; an uplink transmission having a second priority; a sidelink transmission having a priority value greater than the second parameter; and determining performing both a sidelink transmission and an uplink transmission, or either the sidelink transmission or the uplink transmission, based on the determination; A communication method for a terminal comprising:

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