Terminal, base station, and transmission method

Abstract

This terminal comprises: a reception unit that receives, from a base station of a first operator, first resource allocation information, which is information about the allocation of a resource for sidelink transmission by the first operator, and receives, from a base station of a second operator, second resource allocation information, which is information about the allocation of a resource for sidelink transmission by the second operator; a control unit that determines, on the basis of the second resource allocation information, whether to perform sidelink transmission using the resource allocated by the first resource allocation information; and a transmission unit that executes the sidelink transmission if a determination was made to perform the sidelink transmission.

Description

Technical Field

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

Background Art

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

[0003] D2D reduces traffic between a terminal and a base station and enables communication between terminals even when the base station becomes inoperable during a disaster or the like. Note that in 3GPP (3rd Generation Partnership Project), D2D is referred to as "sidelink", so sidelink is basically used in this specification as well.

[0004] Sidelink communication is roughly classified into discovery for discovering other communicable terminals and communication for direct communication between terminals (also referred to as D2D direct communication, direct communication between terminals, etc.). Hereinafter, when communication, discovery, etc. are not particularly distinguished, it is simply referred to as sidelink. Various use cases of services related to V2X (Vehicle to Everything) in NR are being studied.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0006] It is assumed that sidelink services are provided by a plurality of different operators (which may be called communication carriers) in the same area.

[0007] In a mode of allocating resources for sidelink transmission from a base station to a terminal, in an environment where there are a plurality of operators as described above, there may be sidelink transmissions that are uncontrollable from the perspective of a certain operator. Therefore, there may be collisions in sidelink transmissions between terminals of different operators.

[0008] The present invention has been made in view of the above points, and an object thereof is to provide a technology that enables avoidance of collisions in sidelink transmissions between terminals of different operators.

MEANS FOR SOLVING THE PROBLEM

[0009] According to the disclosed technology, a receiving unit receives first resource allocation information, which is resource allocation information for sidelink transmission in the first operator, from a base station of the first operator, and receives second resource allocation information, which is resource allocation information for sidelink transmission in the second operator, from a base station of the second operator; a control unit determines whether to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information; a transmitting unit executes the sidelink transmission when it is determined that the sidelink transmission is to be performed; A terminal comprising The receiving unit is assumed to receive signals addressed to a plurality of terminals from the base stations of each operator at each PDCCH monitoring opportunity. When signals addressed to a plurality of terminals are not received at a certain PDCCH monitoring opportunity, the transmitting unit does not perform sidelink transmission using the resources corresponding to the certain PDCCH monitoring opportunity a terminal is provided.

EFFECTS OF THE INVENTION

[0010] According to the disclosed technology, a technology is provided that enables avoidance of collisions in sidelink transmissions between terminals of different operators.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

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

[0013] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing NR (for example, the technologies disclosed in Non-Patent Documents 1 to 3) or existing LTE, but is not limited to existing NR or existing LTE. In addition, the term "LTE" used in this specification has a broad meaning including LTE-Advanced, and systems after LTE-Advanced (e.g., NR), or wireless LAN (Local Area Network) unless otherwise specified.

[0014] Also, in the embodiment of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or other modes (e.g., Flexible Duplex, etc.).

[0015] Also, the "resource" in the embodiment of the present invention may be a time resource, a frequency resource, or a time-frequency resource.

[0016] Also, in the embodiment of the present invention, that a radio parameter or the like is "configured" may mean that a predetermined value is pre-configured, or that a radio parameter notified from the base station 10 or the terminal 20 is configured.

[0017] Also, in the following description, as an example, the operations of the upper layer (e.g., MAC layer) and the lower layer (e.g., PHY layer) in the terminal are described. However, the functional division between the upper layer and the lower layer is merely an example, and the operations described below may be performed without distinguishing between the upper layer and the lower layer.

[0018] FIG. 1 is a diagram for explaining V2X. In 3GPP, it is being considered to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by expanding the D2D function, and the standardization is in progress. As shown in FIG. 1, V2X is a part of ITS (Intelligent Transport Systems), and means V2V (Vehicle to Vehicle), which is a communication form carried out between vehicles, V2I (Vehicle to Infrastructure), which is a communication form carried out between a vehicle and a roadside unit (RSU) installed beside the road, V2N (Vehicle to Network), which is a communication form carried out between a vehicle and an ITS server, and V2P (Vehicle to Pedestrian), which is a communication form carried out between a vehicle and a mobile terminal held by a pedestrian.

[0019] Also, in 3GPP, V2X using LTE or NR cellular communication and device-to-device communication is being considered. V2X using cellular communication is also called cellular V2X. In NR V2X, studies are underway to achieve large capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0020] Regarding LTE or NR V2X, it is assumed that studies will be carried out not limited to future 3GPP specifications. For example, it is assumed that studies will be carried out on ensuring interoperability, reducing costs by implementing upper layers, methods of using or switching multiple RATs (Radio Access Technologies), compliance with regulations in each country, data acquisition, distribution, database management, and utilization methods of the LTE or NR V2X platform.

[0021] In the embodiments of the present invention, a form in which a communication device (which may also be referred to as a terminal) is mounted on a vehicle is mainly assumed, but the embodiments of the present invention are not limited to such a form. For example, the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, or the communication device may be a base station, an RSU, a relay station (relay node), a terminal having scheduling capabilities, etc. Here, a vehicle on which the communication device is mounted may also be referred to as a terminal.

[0022] Note that SL (Sidelink) may be distinguished from UL (Uplink) or DL (Downlink) based on any one or a combination of the following 1)-4). Also, SL may have another name. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Synchronization signals to be referred to (including SLSS (Sidelink Synchronization Signal)) 4) Reference signals used for path loss measurement for transmission power control

[0023] Also, regarding 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.

[0024] In the SL of LTE, Mode 3 and Mode 4 are defined for the resource allocation of SL to terminal 20. In Mode 3, the transmission resource is dynamically allocated by DCI (Downlink Control Information) transmitted from base station 10 to terminal 20. Also, SPS (Semi Persistent Scheduling) is possible in Mode 3. In Mode 4, terminal 20 autonomously selects the transmission resource from the resource pool.

[0025] In the SL of NR, Mode 1 and Mode 2 are defined for the resource allocation of SL to terminal 20. In Mode 1, the transmission resource is allocated by DCI transmitted from base station 10 to terminal 20. In Mode 2, terminal 20 autonomously selects the transmission resource from the resource pool.

[0026] Note that the slot in the embodiment of the present invention may be read as a symbol, a mini-slot, a sub-frame, a radio frame, a TTI (Transmission Time Interval). Also, the cell in the embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including wireless LAN), etc.

[0027] In the embodiment of the present invention, terminal 20 is not limited to a V2X terminal and may be any type of terminal that performs D2D communication. For example, terminal 20 may be a terminal owned by a user such as a smartphone, or an IoT (Internet of Things) device such as a smart meter. Also, the terminal may be referred to as a "UE".

[0028] (Basic configuration example and basic operation example of the system)

[0029] Figures 2 to 13 described below show examples of the system configuration in the present embodiment and examples of the basic operations in the system according to the present embodiment.

[0030] As shown in Figure 2, the wireless communication system according to the present embodiment includes a terminal 20A, a terminal 20B, and a base station 10. Although there are actually a large number of terminals, Figure 2 shows the terminal 20A and the terminal 20B as examples.

[0031] Hereinafter, when the terminals 20A, 20B, etc. are not particularly distinguished, they are simply described as "terminal 20" or "UE". In Figure 2, as an example, the case where both the terminal 20A and the terminal 20B are within the cell coverage is shown. However, the operations in the present embodiment can also be applied when the terminal 20 is outside the coverage.

[0032] Note that the terminal 20 does not necessarily need to be a device in one housing. For example, even when various sensors are distributed and arranged in a vehicle, the device including the various sensors may be the terminal 20.

[0033] Also, the processing content of the sidelink transmission data of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR. For example, the terminal 20 may scramble the codeword of the transmission data, modulate it to generate complex-valued symbols, map the complex-valued symbols (transmission signals) to 1 or 2 layers, and perform precoding. Then, map it to resource elements to generate a transmission signal (e.g., complex-valued time-domain SC-FDMA signal) and transmit it from each antenna port.

[0034] For the base station 10, it has the functions of cellular communication as a base station in LTE or NR, and the functions for enabling the communication of the terminal 20 in the present embodiment (e.g., resource pool setting, resource allocation, etc.). Further, the base station 10 may be an RSU (gNB type RSU). The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Also, the TTI (Transmission Time Interval) in the time domain may be a slot, or a subframe, or a symbol.

[0035] Also, in the wireless communication system according to the present embodiment, the signal waveform used by the terminal 20 for SL or UL may be OFDMA, or SC - FDMA, or other signal waveforms.

[0036] In the example shown in FIG. 2, the transmitting - side terminal 20A may be referred to as TX - UE, and the receiving - side terminal 20B may be referred to as RX - UE.

[0037] FIG. 2 is also a diagram for explaining an operation example in example (1) of the transmission mode of V2X. In the transmission mode of the sidelink communication shown in FIG. 2, in step 1, the base station 10 transmits the sidelink scheduling information to the terminal 20A. Subsequently, based on the received scheduling information, the terminal 20A transmits control information via the PSCCH (Physical Sidelink Control Channel) and transmits data (which may also be control information) to the terminal 20B via the PSSCH (Physical Sidelink Shared Channel) (step 2). Note that transmitting control information via the PSCCH may be expressed as "transmitting the PSCCH", and transmitting data (which may also be control information) via the PSSCH may be expressed as "transmitting the PSSCH".

[0038] The transmission mode of sidelink communication shown 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 the UTRAN (Universal Terrestrial Radio Access Network) and the UE (User Equipment). Also, the transmission mode of sidelink communication shown in FIG. 2 may be referred to as sidelink transmission mode 1 in NR.

[0039] FIG. 3 is a diagram for explaining an operation example in Example (2) of the transmission mode of V2X. In the transmission mode of sidelink communication shown in FIG. 3, in step 1, terminal 20A transmits PSCCH and PSSCH to terminal 20B using the autonomously selected resource. 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, terminal 20A itself performs resource selection. The transmission mode of sidelink communication shown in FIG. 3 may be referred to as sidelink transmission mode 2 in NR. In sidelink transmission mode 2 in NR, terminal 20A itself performs resource selection.

[0040] FIG. 4 is a diagram for explaining an operation example in Example (3) of the transmission mode of V2X. In the transmission mode of sidelink communication shown in FIG. 4, in step 1, terminal 20A transmits PSCCH and PSSCH to terminal 20B using the autonomously selected resource. Similarly, terminal 20B transmits PSCCH and PSSCH to terminal 20A using the autonomously selected resource (step 1). The transmission mode of sidelink communication shown in FIG. 4 may be referred to as sidelink transmission mode 2 or transmission mode 2a in NR. In sidelink transmission mode 2 in NR, terminal 20 itself performs resource selection.

[0041] FIG. 5 is a diagram for explaining an operation example in an example (4) of the transmission mode of V2X. In the transmission mode of sidelink communication shown in FIG. 5, at step 0, the base station 10 transmits the sidelink resource pattern to the terminal 20A via RRC (Radio Resource Control) configuration. Alternatively, the sidelink resource pattern is pre-configured in the terminal 20A. Subsequently, the terminal 20A transmits the PSSCH to the terminal 20B based on the received or pre-configured resource pattern (step 1). The transmission mode of sidelink communication shown in FIG. 5 may be referred to as sidelink transmission mode 2c in NR.

[0042] FIG. 6 is a diagram for explaining an operation example in an example (5) of the transmission mode of V2X. In the transmission mode of sidelink communication shown in FIG. 6, at step 1, the terminal 20A transmits the sidelink scheduling information to the terminal 20B by means of the PSCCH. Subsequently, the terminal 20B transmits the PSSCH to the terminal 20A based on the received scheduling information (step 2). The transmission mode of sidelink communication shown in FIG. 6 may be referred to as sidelink transmission mode 2d in NR.

[0043] FIG. 7 is a diagram for explaining an operation example in an example (1) of the communication type of V2X. The sidelink communication type shown in FIG. 7 is unicast. The terminal 20A transmits the PSCCH and the PSSCH to the terminal 20. In the example shown in FIG. 7, the terminal 20A performs unicast to the terminal 20B and also performs unicast to the terminal 20C.

[0044] FIG. 8 is a diagram for explaining an operation example in an example (2) of the communication type of V2X. The sidelink communication type shown in FIG. 8 is groupcast. The terminal 20A transmits the PSCCH and the PSSCH to a group to which one or more terminals 20 belong. In the example shown in FIG. 8, the group includes the terminal 20B and the terminal 20C, and the terminal 20A performs groupcast to the group.

[0045] FIG. 9 is a diagram for explaining an operation example in an example (3) of the communication type of V2X. The sidelink communication type shown in FIG. 9 is broadcast. The terminal 20A transmits PSCCH and PSSCH to one or more terminals 20. In the example shown in FIG. 9, the terminal 20A broadcasts to the terminals 20B, 20C, and 20D. Note that the terminal 20A shown in FIGS. 7 to 9 may be referred to as a header-UE.

[0046] Also, in NR-V2X, HARQ (Hybrid automatic repeat request) is supported for sidelink unicast and groupcast. Further, in NR-V2X, SFCI (Sidelink Feedback Control Information) including HARQ responses is defined. SFCI is transmitted via the PSFCH (Physical Sidelink Feedback Channel).

[0047] Note that in the following description, although the PSFCH is used for transmitting HARQ-ACK in the sidelink, this is just an example. For example, the PSCCH may be used to transmit HARQ-ACK in the sidelink, the PSSCH may be used to transmit HARQ-ACK in the sidelink, or other channels may be used to transmit HARQ-ACK in the sidelink.

[0048] Hereinafter, for convenience, all the information reported by the terminal 20 in HARQ is referred to as HARQ-ACK. This HARQ-ACK may also be referred to as HARQ-ACK information. More specifically, the codebook applied to the HARQ-ACK information reported from the terminal 20 to the base station 10 or the like is referred to as the HARQ-ACK codebook. The HARQ-ACK codebook defines the bit sequence of the HARQ-ACK information. Note that, by "HARQ-ACK", in addition to ACK, NACK is also transmitted.

[0049] FIG. 10 is a sequence diagram showing an operation example (1) related to V2X HARQ-ACK.

[0050] In step S101, the terminal 20A autonomously selects resources to be used for PSCCH and PSSCH from a resource selection window having a predetermined period. The resource selection window may be set from the base station 10 to the terminal 20. In the selection of resources, a resource identification process for determining a set of candidates and a resource selection process for selecting a resource from the set are performed.

[0051] In steps S102 and S103, the terminal 20A transmits SCI (Sidelink Control Information) by PSCCH (or PSSCH) and transmits SL data by PSSCH using the resources autonomously selected in step S101. For example, the terminal 20A may transmit PSCCH using a frequency resource adjacent to the frequency resource of PSSCH at the same time resource as at least a part of the time resource of PSSCH.

[0052] The terminal 20B receives the SCI (PSCCH or PSSCH) and the SL data (PSSCH) transmitted from the terminal 20A. The received SCI may include information on the resources of PSFCH for the terminal 20B to transmit HARQ-ACK for the reception of the data. The terminal 20A may include information on the resources (resource reservation information) autonomously selected in the SCI and transmit it.

[0053] In step S104, the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of PSFCH determined from the received SCI.

[0054] In step S105, when the HARQ-ACK received in step S104 indicates a retransmission request, that is, when it is a NACK (negative acknowledgment), the terminal 20A retransmits the PSCCH and PSSCH to the terminal 20B. The terminal 20A may retransmit the PSCCH and PSSCH using resources autonomously selected.

[0055] Note that when HARQ feedback control is not executed, steps S104 and S105 may not be executed.

[0056] FIG. 11 is a sequence diagram showing an operation example (2) regarding HARQ-ACK in V2X. Blind retransmission not relying on HARQ feedback control for improving the transmission success rate or the reach distance may be executed.

[0057] 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 period. The resource selection window may be set from the base station 10 to the terminal 20.

[0058] In steps S202 and S203, the terminal 20A transmits the SCI by the PSCCH (or PSSCH) and transmits the SL data by the PSSCH using the resources autonomously selected in step S201. For example, the terminal 20A may transmit the PSCCH using a frequency resource adjacent to the frequency resource of the PSSCH at the same time resource as at least a part of the time resource of the PSSCH.

[0059] In step S204, the terminal 20A retransmits the SCI by the PSCCH or PSSCH and the SL data by the PSSCH to the terminal 20B using the resources autonomously selected in step S201. The retransmission in step S204 may be executed multiple times.

[0060] Note that when blind retransmission is not executed, step S204 may not be executed.

[0061] FIG. 12 is a sequence diagram showing an operation example (3) related to V2X HARQ-ACK. The base station 10 may perform sidelink scheduling. That is, the base station 10 may determine the sidelink resources used by the terminal 20 and transmit information indicating the resources to the terminal 20. Further, when HARQ control is applied, the base station 10 may transmit information indicating the resources of the PSFCH to the terminal 20.

[0062] In step S301, the base station 10 performs SL scheduling by transmitting DCI (Downlink Control Information) to the terminal 20A by means of PDCCH. For convenience, the DCI for SL scheduling is referred to as SL scheduling DCI.

[0063] Also, in step S301, the base station 10 may transmit DCI for DL scheduling (which may also be called DL allocation) to the terminal 20A by means of PDCCH. For convenience, the DCI for DL scheduling is referred to as DL scheduling DCI. The terminal 20A that has received the DL scheduling DCI receives DL data by means of PDSCH using the resources specified by the DL scheduling DCI.

[0064] In steps S302 and S303, the terminal 20A transmits SCI (Sidelink Control Information) by means of PSCCH (or PSSCH) and transmits SL data by means of PSSCH using the resources specified by the SL scheduling DCI. Note that in the SL scheduling DCI, only the resources of the PSSCH may be specified. In this case, for example, the terminal 20A may transmit the PSCCH using a frequency resource adjacent to the frequency resource of the PSSCH at the same time resource as at least a part of the time resource of the PSSCH.

[0065] Terminal 20B receives the SCI and SL data (PSSCH) transmitted from terminal 20A. The SCI received by the PSCCH or PSSCH includes information on the PSFCH resource for terminal 20B to transmit the HARQ-ACK for the reception of the data.

[0066] The information on the resource may be included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and terminal 20A may obtain the information on the resource from the DL scheduling DCI or SL scheduling DCI and include it in the SCI. Alternatively, it may be assumed that the DCI transmitted from the base station 10 does not include the information on the resource, and terminal 20A may autonomously include the information on the resource in the SCI and transmit it.

[0067] In step S304, terminal 20B uses the PSFCH resource determined from the received SCI to transmit the HARQ-ACK for the received data to terminal 20A.

[0068] In step S305, terminal 20A transmits the HARQ-ACK using the PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or SL scheduling DCI) at the timing (e.g., slot-based timing) specified by the DL scheduling DCI (or the SL scheduling DCI), and the base station 10 receives the HARQ-ACK.

[0069] Note that if the HARQ feedback control is not executed, at least one of step S304 and step S305 may not be executed.

[0070] FIG. 13 is a sequence diagram showing an operation example (4) related to HARQ-ACK of V2X. As described above, in the sidelink of NR, it is supported that HARQ responses are transmitted by PSFCH. Note that, as the format of PSFCH, for example, a format similar to PUCCH (Physical Uplink Control Channel) format 0 can be used. That is, the format of PSFCH may be a sequence-based format in which the PRB (Physical Resource Block) size is 1, and ACK and NACK are identified by differences in sequences or cyclic shifts (or both). The format of PSFCH is not limited to this. The resources of PSFCH may be arranged in the last symbol or a plurality of last symbols of a slot. Also, a period N is set or predefined for the PSFCH resources. The period N may be set or predefined in slot units.

[0071] In FIG. 13, the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain. The PSCCH may be arranged in 1 symbol at the beginning of a slot, or in a plurality of symbols from the beginning, or in a plurality of symbols from symbols other than the beginning. The PSFCH may be arranged in 1 symbol at the end of a slot, or in a plurality of symbols at the end of a slot. Note that, the "beginning of a slot" may mean the first symbol among the X symbols that can be used for sidelink in the plurality of symbols constituting 1 slot, or may mean the first symbol among the symbols excluding the first symbol of the X symbols. Similarly, the "end of a slot" may mean the last symbol of the X symbols, or may mean the last symbol among the symbols excluding the last symbol of the X symbols. In the example shown in FIG. 13, 3 sub-channels are set in the resource pool, and 2 PSFCHs are arranged 3 slots after the slot in which the PSSCH is arranged. The arrows from the PSSCH to the PSFCH indicate examples of PSFCHs associated with the PSSCH.

[0072] Figure 13 shows an example of groupcast option 2 in which the HARQ response in NR-V2X groupcast transmits ACK or NACK. As shown in Figure 13, in step S401, terminal 20A, which is the transmitting terminal 20, performs groupcast to terminals 20B, 20C, and 20D, which are the receiving terminals 20, via SL-SCH. In the subsequent step S402, terminal 20B uses PSFCH#B, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D to transmit the HARQ response to terminal 20A. Note that in groupcast option 1, only NACK is transmitted as the HARQ response, and ACK is not transmitted.

[0073] Figure 14 is a diagram showing an example of a sensing operation as a basic operation example of the system in the present embodiment. Here, as an example, an example of a sensing operation in LTE is shown. When partial sensing is not set from the upper layer in the LTE side link, as shown in Figure 14, terminal 20 selects a resource and performs transmission. As shown in Figure 14, terminal 20 performs sensing in a sensing window within a resource pool. By sensing, terminal 20 receives a resource reservation field included in the SCI transmitted from another terminal 20, and based on the field, identifies available resource candidates within a resource selection window in the resource pool. Subsequently, terminal 20 randomly selects a resource from the available resource candidates. Performing sensing on all resources within the sensing window may be referred to as full sensing.

[0074] Also, as shown in Figure 14, the setting of the resource pool may have a period. For example, the period may be a period of 10,240 milliseconds. Figure 14 shows an example in which subframe t 0 SL to subframe t Tmax SL are set as the resource pool. The resource pool within the period may have its area set, for example, by a bitmap.

[0075] Also, as shown in FIG. 14, the transmission trigger in the terminal 20 occurs in subframe n, and the priority of the transmission is p TX Let's assume so. The terminal 20 is in subframe t n-10×Pstep SL from subframe t n-1 SL to subframe t RX In the sensing window, for example, it can be detected that another terminal 20 is performing a transmission with priority p TX and priority p RX If an SCI is detected within the sensing window and the RSRP exceeds the threshold, the resources within the resource selection window corresponding to the SCI are excluded. Also, if an SCI is detected within the sensing window and the RSRP is less than the threshold, the resources within the resource selection window corresponding to the SCI are not excluded. The threshold value may be, for example, the threshold Th pTX,pRX set or defined for each resource within the sensing window based on priority p

[0076] Also, as in subframe t shown in FIG. 14 Z SL For example, for transmission, the resources within the resource selection window corresponding to the resources within the sensing window that were not monitored are excluded.

[0077] Subframe n+T 1 from subframe n+T 2 to subframe n+T A In the resource selection window, as shown in FIG. 14, the resources occupied by other UEs are identified, and the resources from which the said resources are excluded become the set of available resource candidates. Let the set of available resource candidates be S A If S pTX,pRX is less than 20% of the resources in the resource selection window, the threshold Th

[0078] set for each resource in the sensing window is increased by 3 dB and the resource identification is performed again. That is, by increasing the threshold Th pTX,pRX and executing resource identification again, the number of resources not excluded due to the RSRP being less than the threshold is increased. Further, the RSSI of each resource in S A is measured, and the resource with the minimum RSSI is added to the set S B . The operation of adding the resource with the minimum RSSI included in S B to S A is repeated until the set S B becomes 20% or more of the resource selection window.

[0079] The lower layer of the terminal 20 reports S B to the upper layer. The upper layer of the terminal 20 performs random selection on S B to determine the resource to be used. The terminal 20 performs sidelink transmission using the determined resource. Note that after securing a resource once, the terminal 20 may use the resource periodically without performing sensing for a predetermined number of times (for example, C resel times).

[0080] FIG. 15 is a diagram showing an example of the partial sensing operation. When partial sensing is set from the upper layer in the LTE sidelink, as shown in FIG. 15, the terminal 20 selects a resource and performs transmission. As shown in FIG. 15, the terminal 20 performs partial sensing on a part of the sensing window within the resource pool. By partial sensing, the terminal 20 receives the resource reservation field included in the SCI transmitted from other terminals 20, and based on the field, identifies the available resource candidates within the resource selection window in the resource pool. Subsequently, the terminal 20 randomly selects a resource from the available resource candidates.

[0081] Also, as shown in FIG. 15, the setting of the resource pool may have a period. For example, the period may be a period of 10240 milliseconds. FIG. 15 shows from subframe t 0 SL to subframe t TmaxSL The example up to this point is set as a resource pool. The resource pool within a period may have its area set by, for example, a bitmap.

[0082] As shown in FIG. 15, the transmission trigger in the terminal 20 occurs in subframe n, and the priority of the transmission is p TX Let's assume so. In the example of FIG. 15, from subframe n + T 1 to subframe n + T 2 Among them, the Y subframes from subframe t y SL to subframe t y+Y SL are set as a resource selection window. Further, as shown in FIG. 15, the transmission trigger in the terminal 20 occurs in subframe n, and the priority of the transmission is p TX Let's assume so.

[0083] The terminal 20 can detect, for example, that another terminal 20 is performing a transmission with priority p y-k×Pstep SL in one or more sensing windows from subframe t y+Y-k×Pstep SL to subframe t RX k may be, for example, a 10 - bit bitmap. In FIG. 15, an example is shown where the 3rd and 6th bits of the bitmap k are set to "1" indicating partial sensing. That is, in FIG. 15, from subframe t y-6×Pstep SL to subframe t y+Y-6×Pstep SL and from subframe t y-3×Pstep SL to subframe t y+Y-3×Pstep SL are set as sensing windows. As described above, the i - th bit of the bitmap k corresponds to the sensing window from subframe t y-i×Pstep SL to subframe t y+Y-i×Pstep SL That is, the i - th bit of the bitmap k corresponds to the sensing window from subframe t

[0084] If SCI is detected within the above-mentioned one or more sensing windows and the RSRP exceeds the threshold, the resources within the resource selection window corresponding to the SCI are excluded. Also, if SCI is detected within the sensing window and the RSRP is less than the threshold, the resources within the resource selection window corresponding to the SCI are not excluded. The threshold is, for example, the priority p TX and the priority p RX Based on this, the threshold Th is set or defined for each resource within the sensing window pTX,pRX and may be.

[0085] In the resource selection window where the Y subframe is set, the terminal 20 identifies the resources occupied by other UEs, and the resources obtained by excluding the identified resources become candidate available resources. Let the set of candidate available resources be S A Then, if S A is less than 20% of the resources in the resource selection window, the threshold Th pTX,pRX set for each resource in the sensing window is increased by 3 dB and the resource identification is performed again. That is, by increasing the threshold Th pTX,pRX and performing the resource identification again, the resources that are not excluded due to the RSRP being less than the threshold are increased. Further, the RSSI of each resource in S A is measured, and the resource with the minimum RSSI is added to the set S B . The operation of adding the resource with the minimum RSSI included in S B to S A is repeated until the set S B of resource candidates becomes 20% or more of the resource selection window.

[0086] The lower layer of the terminal 20 reports S B to the upper layer. The upper layer of the terminal 20 reports S BRandom selection may be performed for [resource name] to determine the resources to be used. The terminal 20 may perform sidelink transmission using the determined resources. Note that after the terminal 20 secures resources once, it may periodically use the resources without performing sensing for a predetermined number of times (for example, C resel times).

[0087] In FIGS. 14 and 15 described above, the operations of the transmitting terminal 20 were described. The receiving terminal 20 detects data transmission from another terminal 20 based on the result of sensing or partial sensing, and receives data from the other terminal 20.

[0088] The resource selection operation in NR (for example, Non-Patent Documents 2 and 3) is basically the same as the resource selection operation in LTE.

[0089] That is, the TX-UE excludes all resources in the resource selection window in the resource pool (let this be M total . Initially, M total =S A ) based on the sensing in the sensing window, and excludes the specific resources detected from S A . The specific resources are resources reserved by the SCI received by the TX-UE, resources for which the RSRP (received power) for the SCI is higher than the threshold, resources not sensed, and the like.

[0090] When the amount of identified resources (the amount of resources of S A ) is less than X% of the amount of all resources in the resource selection window in the resource pool, the above process is repeated while increasing the threshold by 3 dB until this becomes X% or more. X is, for example, 20. Note that one resource is, for example, a resource of "1 slot × (one or more subchannels)". Also, the RSRP may be a value measured by the DM-RS of the resource of the PSCCH that transmits the SCI, or may be a value measured by the DM-RS of the resource of the PSSCH indicated (reserved) by the SCI.

[0091] In the TX-UE, the determined S A is reported to the upper layer, and in the upper layer, for example, S is randomly selected A from to select a transmission resource. In NR, power saving based on the above-described partial sensing may be performed.

[0092] On the other hand, in the NR Release 16 side link, a pre-emption confirmation and re-evaluation function is adopted, and the terminal 20 in the present embodiment can execute pre-emption confirmation and re-evaluation. Pre-emption confirmation and re-evaluation are functions for resource allocation mode 2 for selecting resources that the terminal 20 autonomously transmits, but may be used in mode 1 in the present embodiment.

[0093] FIG. 16 is a flowchart for explaining an example of re-evaluation. FIG. 17 is a diagram showing an example of re-evaluation. In step S501, the terminal 20 performs sensing in a sensing window. When the terminal 20 performs power saving operation, sensing may be performed in a predefined limited period. Subsequently, the terminal 20 identifies each resource in the resource selection window based on the sensing result and determines a set S A of resource candidates (S502). Subsequently, the terminal 20 selects a resource set (r_0, r_1,...) from the set S A of resource candidates (S503). This resource set may be the resources selected by the upper layer and scheduled to be used for transmission.

[0094] In step S504, the terminal 20, for example, at the timing of T(r_0)-T shown in FIG. 17 3 again identifies each resource in the resource selection window based on the sensing result and determines a set S A of resource candidates. Subsequently, the terminal 20 determines S AIf the resource set does not contain the resource \(r_i\), then \(r_i\) is excluded from the resource set (S505), the resource set is updated, and the re-evaluation is terminated. In the upper layer, a resource is selected from the resource set after re-evaluation.

[0095] In the example of re-evaluation shown in FIG. 17, among the resources \(r_0\) and \(r_1\), since \(r_1\) is not included in S A as a result of the re-sensing, it is excluded from the resource set. Therefore, the terminal 20 executes transmission using the resource \(r_0\).

[0096] FIG. 18 is a sequence diagram showing an example of preemption confirmation. In FIG. 17, the operation will be described by replacing "re-evaluation" with "preemption confirmation" and replacing "\(r_0\)" and "\(r_1\)" with "\(r'_0\)" and "\(r'_1\)". In step S601, the terminal 20 performs sensing in the sensing window. When the terminal 20 performs power-saving operation, sensing may be performed within a predefined limited period. Subsequently, the terminal 20 identifies each resource in the resource selection window based on the sensing result and determines the set S A of resource candidates (S602). Subsequently, the terminal 20 selects a resource set (\(r'_0,r'_1,\cdots\)) from the set S A of resource candidates (S603). This resource set may be the resource selected in the upper layer and scheduled to be used for transmission.

[0097] In step S604, the terminal 20 re-identifies each resource in the resource selection window based on the priority according to the sensing result at the timing of \(T(r_0)-T\) shown in FIG. 17 3 and determines the set S A of resource candidates. For example, \(r'_1\) shown in FIG. 17 is included in the set S A as a result of the re-sensing.

[0098] When preemption confirmation is valid, if the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is lower than the value prio_TX indicating the priority of the transport block to be transmitted from the own terminal, the terminal 20 excludes the resource r′_1 from S A Note that for the value indicating the priority, the lower the value, the higher the priority. That is, when the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is higher than the value prio_TX indicating the priority of the transport block to be transmitted from the own terminal, the terminal 20 does not exclude the resource r′_1 from S A Hereinafter, regarding the priority, when it is said to be "high", it means that the priority is high.

[0099] In step S605, if the resource r′_i is not included in S

[0100] A , the terminal 20 excludes r′_i from the resource set (S605) and updates the resource set S A A . In this case, it is determined that r′_i is unusable based on the upper layer parameters and prio_TX, prio_RX, and the preemption confirmation is terminated. The terminal 20 selects a transmission resource from the updated S A A A A

[0101] (Regarding Mode 1) The technology described in this embodiment is not limited to a specific radio system such as NR or LTE, and a specific mode. As an example, since Mode 1 (resource allocation mode 1) of NR is assumed, the outline of Mode 1 will be described here.

[0102] As described with reference to FIG. 2 and the like, in Mode 1, the SL transmission resource is allocated from the base station 10 to the terminal 20. That is, as shown in FIG. 19, for the terminal 20, the SL transmission resource (that is, PSCCH. PSCCH) is allocated by the PDCCH (specifically, DCI) received from the base station 10, and the terminal 20 performs SL transmission using the resource.

[0103] More specifically, for the allocation of SL transmission from the base station 10 to the terminal 20, there are dynamic grant (DG), configured grant (CG) type 1, and CG type 2. In mode 1, DCI format 3_0 is used for DG and CG type 2. Note that the monitoring opportunity of DCI format 3_0 is set separately from other formats.

[0104] Fig. 20 shows an example of the fields of DCI format 3_0. As shown in Fig. 20, the information notified by DCI format 3_0 includes information on the scheduled resources, information on the first transmission / resending, and information on the feedback. Regarding the information on the first transmission / resending, the transmitting terminal 20A manages the relationship between the HPN (HARQ Process Number) specified in DCI format 3_0 and the HPN in the SCI.

[0105] Also, regarding the feedback, it is as described with reference to Fig. 12 and the like. Fig. 21 shows the resources in the case described in Fig. 12. As shown in Fig. 21, it is possible to feedback the HARQ-ACK fed back to the terminal 20A by the PSFCH to the base station 10 by the PUCCH.

[0106] (Regarding the problem) It is assumed that the SL service is provided by a plurality of different communication carriers in the same area. Hereinafter, the communication carrier will be referred to as an "operator".

[0107] That is, a situation is assumed in which a plurality of terminals 20 belonging to different operators exist at distances where signals can reach each other. When SL communication is performed by a plurality of terminals 20 in such an environment, uncontrollable SL transmission will occur from the perspective of a certain operator. For example, an SL signal transmitted using the resources scheduled from the base station 10A by the terminal 20A belonging to operator A may interfere with the terminal 20B of operator B that receives the signal.

[0108] Hereinafter, as examples of specific technologies for solving the above problems, Examples 1 to 5 will be described. Examples 1 to 5 can be implemented in any combination. Further, in Examples 1 to 5, it is assumed that synchronization is achieved in a communication system among a plurality of operators.

[0109] (Example 1) <Basic Operation> First, Example 1 will be described. In Example 1, a terminal 20 scheduled for SL transmission determines the feasibility of the scheduled SL transmission or the available transmission resources based on a signal received from another terminal 20.

[0110] That is, a terminal 20 of a certain operator scheduled for SL transmission performs collision avoidance with a terminal 20 belonging to another operator based on information known from an SL signal received from the terminal 20 belonging to the other operator. Basically, in Example 1, a terminal 20 of a certain operator scheduled for SL transmission performs sensing of an SL signal transmitted from a terminal 20 belonging to another operator and performs collision avoidance, similar to the sensing in Mode 2 described above.

[0111] A specific example will be described with reference to FIG. 22. As shown in FIG. 22, it is assumed that there are a base station 10-1 of Operator 1, a terminal 20-1 of Operator 1, a base station 10-2 of Operator 2, and a terminal 20-2 of Operator 2.

[0112] For the terminal 20-1, SL transmission is scheduled by scheduling #1 from the base station 10-1, and for the terminal 20-2, SL transmission is scheduled by scheduling #2 from the base station 10-2.

[0113] The terminal 20-2 transmits an SL signal based on scheduling #2, and the terminal 20-1 receives the SL signal. The terminal 20-1 determines the availability of the resources allocated in scheduling #1 based on the SL signal received from the terminal 20-2.

[0114] For example, terminal 20-1 receives the SCI as an SL signal from terminal 20-2, and determines from the SCI that the resource indicated by A in FIG. 23 is reserved. On the other hand, for terminal 20-1, the resource indicated by B is allocated as an SL transmission resource by scheduling #1.

[0115] When terminal 20-1 detects that the reserved resource by terminal 20-2 collides with the resource B allocated to itself, it determines that the use of resource B is not possible, and for example, does not perform SL signal transmission using resource B. Thereby, interference with one or more terminals 20 of operator 2 can be avoided.

[0116] In the above example, terminal 20-1 determines the usability of the resource allocated to itself based on the resource reservation information received from terminal 20-2, but this is just an example. Terminal 20-1 may determine the usability of the resource allocated to itself based on either or both of the information indicated by the time resource assignment field and the information indicated by the resource reservation period field in the SCI received from terminal 20-2.

[0117] Also, terminal 20-1 may determine the usability of the resource allocated from base station 10-1 based on the reception power of the SL signal received from terminal 20-2. For example, when the reception power of the SL signal of a certain resource received from terminal 20-2 is equal to or higher than a threshold value, and part or all of the resource overlaps with part or all of the resource allocated from base station 10-1, terminal 20-1 may determine that the resource is not available for use.

[0118] Also, when determining the availability of the resources allocated from the base station 10-1, the terminal 20-1 may regard the resources allocated from the base station 10-1 as the resources it has selected in mode 2, and perform the same operations as the aforementioned re-evaluation or Pre-emption confirmation.

[0119] <Resource Selection Operation for Use> In the above example, the terminal 20-1 determines the availability of the resources allocated from the base station 10-1 based on the SL signal received from another terminal 20. As a more detailed operation, it may perform the resource selection operation for use described below.

[0120] In the resource selection operation for use, a plurality of resources are allocated to the terminal 20-1 as resources available for SL transmission from the base station 10-1. The terminal 20-1 selects available resources from among the plurality of resources based on the SL signal received from the terminal 20-2, and performs SL transmission using the selected resources.

[0121] For example, assume that four resources A, B, C, and D are allocated to the terminal 20-1 as resources available for SL transmission from the base station 10-1. If the terminal 20-1 determines based on the SL signal received from the terminal 20-2 that the resources A and B are being used (including being reserved) by the terminal 20-2, it performs SL transmission using either or both of the resources C and D.

[0122] Regarding the plurality of resources allocated from the base station 10-1, they may be allocated by a plurality of DCIs, or may be allocated at once by one DCI. The plurality of resources allocated at once may be four or more resources.

[0123] Also, a plurality of resources may be treated as a set, and a certain set among the sets may be instructed from the base station 10-1 to the terminal 20-1.

[0124] For example, when set 1 having four resources A, B, C, and D is specified as a set of available resources from base station 10-1 to terminal 20-1, terminal 20-1 selects a resource to use from resources A, B, C, and D included in set 1.

[0125] Also, in the available resource selection operation in which a plurality of resources are allocated from base station 10-1 to terminal 20-1, as described with reference to FIG. 12, terminal 20-1 may perform feedback to base station 10-1. In this case, terminal 20-1 may determine a resource for feedback (e.g., a time resource, a frequency resource, or a time-frequency resource) based on a specific (e.g., "last in time" or "first in time") resource among the plurality of resources. The resource for feedback may not be based on the resource actually used for SL transmission.

[0126] For example, assume that terminal 20-1 receives an allocation of resources A, B, C, and D as a plurality of resources and performs SL transmission using resource A. Also, assume that among resources A, B, C, and D, the resource last in time is resource D. Then, for example, terminal 20-1 transmits feedback regarding the SL transmission using resource A to base station 10-1 in a slot that is a predetermined number of slots after the slot of resource D.

[0127] <Operation of reporting to base station> When terminal 20-1 does not perform SL transmission using the resources allocated from base station 10-1, for example, based on reception of a signal from terminal 20-2, terminal 20-1 may transmit a NACK to base station 10-1.

[0128] Also, in the above-described available resource selection operation, terminal 20-1 may report to base station 10-1 a resource that was not used for SL transmission among the plurality of resources allocated from base station 10-1.

[0129] <Regarding resource groups> In the first embodiment, the resource group (e.g., transmission resource pool) available for SL transmission may be common among operators. Also, the resource group available for SL transmission may be the same as the resource group (e.g., reception resource pool) on which the SL signal should be received (i.e., the SL signal should be monitored).

[0130] An example is shown in FIG. 24. In the example shown in FIG. 24, the transmission resource pool and the reception resource pool are the same, and the transmission resource pool and the reception resource pool are the same for Operator 1 and Operator 2.

[0131] <Effect of the first embodiment> It is assumed that the terminal 20 operating in Mode 1 also supports the operation in Mode 2. In the first embodiment, the terminal 20 performs operations similar to sensing in Mode 2, and re-evaluation or pre-emption confirmation, thereby avoiding signal collisions with the terminals 20 of other operators. Thus, it is possible to avoid collisions between the terminals operating in Mode 1 while suppressing additional terminal implementation.

[0132] (Second embodiment) The second embodiment is based on the first embodiment described above. In the second embodiment, a part of the resource group (e.g., reception resource pool) on which the SL signal should be received (i.e., the SL signal should be monitored) may be the resource group (e.g., transmission resource pool) available for SL signal transmission.

[0133] FIG. 25 shows an example of a transmission resource pool (TX resource pool) and a reception resource pool (RX resource pool). The example shown in FIG. 25 assumes a situation where there are a base station 10-1 and a terminal 20-1 belonging to Operator 1, and a base station 10-2 and a terminal 20-2 belonging to Operator 2, as shown in FIG. 22.

[0134] As shown in FIG. 25, in this example, the reception resource pool is common between Operator 1 and Operator 2. On the other hand, a part of the reception resource pool (the upper half in the example of FIG. 25) is the transmission resource pool of Operator 1, and the other part of the reception resource pool (the lower half in the example of FIG. 25) is the transmission resource pool of Operator 2. That is, the transmission resource pool is divided between operators.

[0135] Regarding the resource pool setting as described above, it may be predetermined in the specification or the like, and the terminal 20 and the base station 10 of each operator may operate according to the specification, or it may be set by an RRC signal, a MAC CE, or DCI from the base station 10 to the terminal 20 in each operator.

[0136] As shown in FIG. 25, by making a resource pool setting that divides the transmission resource pool between operators, collisions of the allocated resources to terminal 20-1 and the allocated resources to terminal 20-2 can be avoided.

[0137] <Effect of Embodiment 2> As described above, in Embodiment 2, collision avoidance of SL transmission between a terminal 20 belonging to a certain operator and a terminal 20 belonging to another operator can be performed by prior setting. Thereby, it is possible to prevent collisions of SL transmissions between terminals under different operator controls.

[0138] (Embodiment 3) Next, Embodiment 3 will be described. Embodiment 3 is based on Embodiment 1 and Embodiment 2. However, Embodiment 3 may be based only on Embodiment 1. Alternatively, it may be combined with other embodiments.

[0139] In Embodiment 3, the SCI transmitted by the terminal 20 may include information indicating the operator to which the base station 10 that performed the corresponding scheduling belongs. The information indicating the operator may be the PLMN (Public Land Mobile Network) number of the operator.

[0140] Also, for example, from the base station 10 to the terminal 20, the correspondence between the PLMN and the field value of the SCI may be performed in the upper layer, and when the terminal 20 transmits the SCI, one of the field values may be used to indicate the PLMN.

[0141] For example, the terminal 20 of a certain operator may perform the collision avoidance operation described in the first embodiment only when receiving an SL signal of another operator (that is, an SL signal including information for identifying another operator).

[0142] (Embodiment 4) Next, Embodiment 4 will be described. Embodiment 4 may be implemented without assuming Embodiments 1 to 3, or may be implemented in combination with any one, any plurality, or all of Embodiments 1 to 3.

[0143] In Embodiment 4, the terminal 20 receives information A related to the SL from the base station 10 and transmits information B based on the information A to another terminal 20. Further, the other terminal 20 may transmit information C based on the information B to the base station 10 to which it belongs.

[0144] An example of the information flow when the information A, B, and C are used as described above is shown in FIG. 26. In the example of FIG. 26, there are a base station 10-1 and a terminal 20-1 belonging to Operator 1, and a base station 10-2 and a terminal 20-2 belonging to Operator 2. The terminal 20-1 receives information A from the base station 10-2 and transmits information B based on the information A to the terminal 20-2. The terminal 20-2 transmits information C based on the information B to the base station 10-2.

[0145] Note that it is not essential for the terminal 20-1 to transmit information B based on the information A received from the base station 10-1 to the terminal 20-2, and for the terminal 20-2 to transmit information C based on the information B to the base station 10-2. Either one or both of these may not be executed.

[0146] In Embodiment 4, by the operation as described above, the terminal 20 belonging to a certain operator performs collision avoidance for SL transmission with the terminals 20 belonging to other operators based on the information from the base station 10 of the operator or the information from other terminals 20.

[0147] Hereinafter, taking the case shown in FIG. 26 as an example, for each of Information A, Information B, and Information C, examples regarding the operation related to its transmission and the content of the information will be described.

[0148] <Regarding Information A> In FIG. 26, the signal including Information A transmitted from the base station 10-1 to the terminal 20-1 may be UE-specific DCI, group-common DCI, or upper layer signaling (e.g., MAC CE, RRC signal).

[0149] The Information A transmitted from the base station 10-1 to the terminal 20-1 may be information related to the resources of SL transmission scheduled by the base station 10-1 for one or more terminals (e.g., all terminals under its control) under its own control. That is, for example, when there are terminals 1, 2, and 3 under the control of the base station 10-1, Information A may include the resource information of SL transmission scheduled for terminal 1, the resource information of SL transmission scheduled for terminal 2, and the resource information of SL transmission scheduled for terminal 3.

[0150] Also, Information A may be information related to the resources of SL transmission scheduled by a base station of an operator other than the operator 1 to which the base station 10-1 transmitting Information A belongs (in the example of FIG. 26, the base station 10-2) for one or more terminals (e.g., all terminals under its control) under the control of the base station.

[0151] Also, in any of the above cases, the Information A transmitted from the base station 10-1 to the terminal 20-1 may include the scheduling information of SL transmission addressed to the terminal 20-1.

[0152] When part or all of the resources allocated for SL transmission to the terminal 20-1 from the base station 10-1 overlap with part or all of the resources indicated by information A (e.g., SL transmission resources in another operator), the terminal 20-1 may perform a predetermined operation.

[0153] The predetermined operation by the terminal 20-1 is, for example, to stop SL transmission using the resources allocated to itself. In this case, the terminal 20-1 may send a NACK to the base station 10-1.

[0154] Also, the predetermined operation by the terminal 20-1 may be to execute SL transmission using the resources allocated to itself with increased transmission power. Also, the predetermined operation by the terminal 20-1 may be to execute SL transmission using the resources allocated to itself as usual.

[0155] Regarding which of the above operations (transmission stop, increased transmission power, normal transmission) to execute, it may be determined based on at least one of the priority of the allocated resources, the resource allocation order, and whether the resource can be reserved. As an example, assuming the priority types of the allocated resources are high, medium, and low, if the priority = high, increase the transmission power; if the priority = medium, perform normal transmission; if the priority = low, perform transmission stop.

[0156] <Regarding information B> The terminal 20-1 may always send information B when it receives information A, or may determine whether a predetermined condition is satisfied and send it only when it is determined that the predetermined condition is satisfied. The predetermined condition is, for example, to be scheduled to transmit at a predetermined time (e.g., a slot or a time window).

[0157] As an example, when the terminal 20-1 is scheduled to perform SL transmission from the time when it receives information A (for example, slot k) to the time n slots later (that is, slot k + n), information B is transmitted, for example, at the timing of the SL transmission. "Scheduled to perform SL transmission" means, for example, that SL transmission is scheduled for the terminal 20-1, or that the terminal 20-1 is scheduled to perform SL transmission using a resource autonomously selected.

[0158] The terminal 20-1 may transmit information B using a resource dedicated for information B transmission, or may use a resource preset as a separate resource among operators. As an example, assume that resource B1 is set for the terminal 20-1 for information B transmission in operator 1, and resource B2 is set for the terminal 20-2 for information B transmission in operator 2. At this time, the terminal 20-1 transmits information B using resource B1.

[0159] After a resource for transmitting information B is allocated to the terminal 20-1, the terminal 20-1 may unconditionally transmit information B. Also, a predetermined (e.g., highest) priority may be assigned to the resource for transmitting information B, and the terminal 20-1 may transmit information B according to the priority.

[0160] The signal including information B transmitted by the terminal 20-1 may be transmitted on a data channel, a control channel, a feedback channel, or a dedicated channel other than these.

[0161] Also, the signal including information B transmitted by the terminal 20-1 may be an SCI. When using an SCI, the format of the SCI may be any format. Also, a format dedicated for an SCI including information B may be used as the format of the SCI.

[0162] In addition, the signal including the information B transmitted by the terminal 20-1 may be transmitted by upper layer signaling (e.g., MAC CE, RRC signal). Also, the signal including the information B transmitted by the terminal 20-1 may be transmitted by any of broadcast / groupcast / unicast.

[0163] The information B transmitted by the terminal 20-1 may be, for example, information on resources that cannot be used for SL transmission by terminals 20 other than the operator 1 to which the terminal 20-1 belongs. The information on resources that cannot be used for the SL transmission may be information on resources that are planned to be used by terminals 20 other than the terminal 20 for the terminal 20 that receives the information B.

[0164] For example, when information on resources for SL transmission scheduled for one or more terminals 20 under the control of operator 1 is transmitted from the base station 10-1 to the terminal 20-1 as information A, the terminal 20-1 may transmit the information A as information B (i.e., information on resources that cannot be used for SL transmission for terminals 20 of other operators).

[0165] When a part or all of the resources allocated for SL transmission to itself from the base station 10-2 overlap with part or all of the resources indicated by the information B (e.g., SL transmission resources in other operators) for the terminal 20-2 that receives the information B, the terminal 20-2 may perform a predetermined operation.

[0166] The predetermined operation by the terminal 20-2 is, for example, to stop SL transmission using the resources allocated to itself. In this case, the terminal 20-2 may transmit a NACK to the base station 10-2.

[0167] In addition, the predetermined operation by the terminal 20-2 may be to execute SL transmission using the resources allocated to itself with increased transmission power. Also, the predetermined operation by the terminal 20-2 may be to execute SL transmission using the resources allocated to itself as usual.

[0168] Regarding which of the above operations (transmission stop, transmission power increase, normal transmission) to execute, it may be determined based on at least one of the priority of the allocated resource, the allocation order of the resource, and whether the resource can be reserved. As an example, assuming that the types of priorities of the allocated resources are high, medium, and low, if the priority = high, increase the transmission power; if the priority = medium, perform normal transmission; if the priority = low, stop the transmission. The above may be performed based on at least one of the priority, the allocation order, and whether the resource can be reserved.

[0169] <Regarding Information C> In FIG. 26, each time the terminal 20-2 receives Information B, it may transmit Information C to the base station 10-2, or it may transmit Information C to the base station 10-2 only when a predetermined condition is satisfied. This predetermined condition may be "receiving Information B".

[0170] Also, the predetermined condition may be, for example, having a plan to perform UL transmission at a predetermined time (e.g., slot or time window).

[0171] As an example, when the terminal 20-2 has a plan to perform UL transmission from the time (e.g., slot k) when it receives Information B to the time n slots later (i.e., slot k + n), it transmits Information C, for example, at the timing of the UL transmission. "Having a plan to perform UL transmission" may mean, for example, that UL transmission is scheduled for the terminal 20-2, or that the terminal 20-2 has a plan to perform UL transmission using resources autonomously selected.

[0172] The terminal 20-2 may transmit Information C using periodic resources. Also, non-periodic resources may be scheduled from the base station 10-2 to the terminal 20-2, and the terminal 20-2 may transmit Information C using the non-periodic resources.

[0173] The signal containing the information C transmitted by the terminal 20-2 may be transmitted on a data channel, a control channel, a feedback channel, or a dedicated channel.

[0174] Also, the signal containing the information C transmitted by the terminal 20-2 may be UCI. When using UCI, the format of UCI may be any format. Also, a UCI-dedicated format containing the information C may be used as the format of UCI.

[0175] Also, the signal containing the information C transmitted by the terminal 20-2 may be transmitted by upper layer signaling (e.g., MAC CE, RRC signal).

[0176] Hereinafter, as specific operation examples related to the above information A, B, and C, Examples 4-1 to 4-3 will be described with reference to the drawings.

[0177] <Example 4-1> FIG. 27 is a diagram for explaining Example 4-1. In S11, the terminal 20-1 of Operator 1 receives, as information A, information on resources allocated for SL transmission to one or more terminals 20 in Operator 2 from the base station 10-1.

[0178] Also, in S12, the terminal 20-1 receives information on resources for SL transmission addressed to itself. In S13, the terminal 20-1 compares the information on resources allocated in Operator 2 indicated by the information A received in S11 with the information on resources addressed to itself received in S12, and performs transmission control such as determining whether to perform SL transmission using the allocated resources in S12. Specifically, as described above, for example, transmission is stopped, transmission is performed with increased transmission power, or normal transmission is performed.

[0179] <Example 4-2> FIG. 28 is a diagram for explaining Example 4-2. In S22, the terminal 20-1 of operator 1 receives, as information A, information on resources allocated for SL transmission to one or more terminals 20 in operator 1 from the base station 10-1.

[0180] In S22, the terminal 20-1 transmits the information received as information A to the terminal 20-2 as information B.

[0181] Also, in S23, the terminal 20-2 receives information on resources for SL transmission addressed to itself. In S24, the terminal 20-2 compares the information on resources allocated by operator 1 indicated in the information B received in S22 with the information on resources addressed to itself received in S23, and performs transmission control such as determining whether to perform SL transmission using the allocated resources in S23. Specifically, as described above, for example, transmission is stopped, transmission is performed with increased transmission power, or normal transmission is performed.

[0182] <Example 4-3> FIG. 29 is a diagram for explaining Example 4-3. In S31, the terminal 20-1 of operator 1 receives, as information A, information on resources allocated for SL transmission to one or more terminals 20 in operator 1 from the base station 10-1.

[0183] In S32, the terminal 20-1 transmits the information received as information A to the terminal 20-2 as information B. In S33, the terminal 20-2 transmits the information received as information B to the base station 10-2 as information C.

[0184] In Example 4-3, as a terminal of operator 2, in addition to the terminal 20-2, a terminal 21-2 is shown. In S34, the terminal 21-2 receives, as information A, information on resources allocated for SL transmission to one or more terminals 20 in operator 1 from the base station 10-2.

[0185] Also, in S35, the terminal 21-2 receives information on the resources for SL transmission addressed to itself. In S36, the terminal 21-2 compares the information on the resources allocated by operator 1 indicated in the information A received in S34 with the information on the resources addressed to itself received in S35, and performs transmission control such as determining whether SL transmission can be performed using the allocated resources in S35. Specifically, as described above, for example, transmission is stopped, transmission is performed with increased transmission power, or normal transmission is performed.

[0186] Also, in the above example, the base station 10-2 may perform scheduling in S35 so as to avoid collision with the resources of operator 1 based on the information C. That is, the base station 10-2 may determine the resources for SL transmission by the terminal 21-2 so as to avoid collision with the resources of operator 1 based on the information C, and transmit the resource allocation information to the terminal 21-2.

[0187] <Effect of Example 4> In Example 4, for example, the base station 10 of each operator can know the SL allocation status of other operators. Regarding the method for the base station 10 to know the SL allocation status of other operators, it may be known from the report from the terminal 20, or it may be known by transmitting and receiving information between base stations.

[0188] Thereby, the base station 10 can schedule so that transmission collision does not occur between the terminal 20 under its control and the terminal 20 of other operators. Also, according to Example 4, the terminal 20 can know the SL allocation status in other operators and execute an operation to avoid transmission collision based on that.

[0189] (Example 5) Next, Example 5 will be described. Example 5 may be implemented without assuming Examples 1 to 4, or may be implemented in combination with any one or any plurality or all of Examples 1 to 4.

[0190] In Embodiment 5, the terminal 20 that performs SL transmission is connected to the base stations 10 of multiple operators. That is, the terminal 20 that performs SL transmission is connected not only to the base station 10 of the operator to which it belongs but also to the base stations 10 of other operators. Thereby, the terminal 20 of a certain operator can perform collision avoidance of SL transmission with the terminal 20 of other operators based on the information known from the signals from each operator.

[0191] Note that in Embodiment 5, "the terminal 20 is connected to the base station 10" includes not only establishing a connection by RRC or the like but also "the terminal 20 receives a signal from the base station 10 without establishing a connection such as RRC". Also, in Embodiment 5, a resource group (e.g., resource pool, CC, serving cell) that can be used only by the terminal 20 connected to the base stations 10 of multiple operators may be set for the terminal 20.

[0192] Hereinafter, more specific examples will be described from the viewpoints of a connection method to base stations of multiple operators, a scheduling method, a method of receiving scheduling information from multiple base stations, and transmission control.

[0193] <Example of connection method to base stations of multiple operators, and transmission control> Here, similar to the cases shown in FIGS. 22 and 26, etc., assume a case where, as seen from the terminal 20-1, there is an operator 1 from which its own scheduling information can be transmitted, and an operator 2 to which only resource allocation information for another terminal 20, i.e., the terminal 20-2, is transmitted. More specifically, the base station 10-1 transmits the scheduling information of the operator 1, and the base station 10-2 transmits the scheduling information of the operator 2.

[0194] An example of the connection method in this case will be described with reference to FIG. 30. In S41, the terminal 20-1 establishes an RRC connection with the base station 10-1. On the other hand, no RRC connection is established between the terminal 20-1 and the base station 10-2. In S42, the terminal 20-1 receives the SSB and system information transmitted from the base station 10-2. The SSB or system information may include information on resources for receiving information (e.g., DCI) transmitted from the base station 10-2 in S44 described later.

[0195] In S43, the terminal 20-1 receives information on resources related to scheduling addressed to itself from the base station 10-1 (scheduling information of operator 1). In S44, the terminal 20-1 receives information on resources related to scheduling for SL transmission in operator 2 from the base station 10-2 (e.g., scheduling information for SL transmission to one or more terminals 20 in operator 2).

[0196] In S45, the terminal 20-1 performs transmission control. Specifically, when part or all of the resources allocated for SL transmission addressed to the terminal 20-1 from the base station 10-1 overlap with part or all of the resources received in S44 (e.g., SL transmission resources in another operator), the terminal 20-1 may perform a predetermined operation.

[0197] The predetermined operation by the terminal 20-1 is, for example, to stop SL transmission using the resources allocated to itself. In this case, the terminal 20-1 may transmit a NACK to the base station 10-1.

[0198] Also, the predetermined operation by the terminal 20-1 may be to execute SL transmission using the resources allocated to itself with increased transmission power. Also, the predetermined operation by the terminal 20-1 may be to execute SL transmission using the resources allocated to itself as usual.

[0199] Regarding which of the above operations (transmission stop, transmission power increase, normal transmission) to execute, it may be determined based on at least one of the priority of the allocated resource, the order of resource allocation, and whether the resource can be reserved. As an example, assuming that the types of priorities of the allocated resources are high, medium, and low, if the priority = high, the transmission power may be increased; if the priority = medium, normal transmission may be performed; and if the priority = low, the transmission may be stopped.

[0200] Referring to FIG. 31, another example will be described. In S51, the terminal 20-1 establishes an RRC connection with the base station 10-1.

[0201] On the other hand, in S52, the terminal 20-1 receives the SSB from the base station 10-2, and in S53, performs PRACH transmission. The PRACH resource (e.g., sequence) used in this PRACH transmission may be different from the PRACH resource used for PRACH transmission for RRC connection.

[0202] After the PRACH transmission, in S54, the terminal 20-1 receives, from the base station 10-2, the configuration information related to the reception of the PDCCH used by the operator 2 for SL transmission resource allocation. The configuration information may include, for example, any one or more or all of the monitoring occasion, CORESET, search space, aggregation level, and RNTI value for the reception of the PDCCH.

[0203] In S55, the terminal 20-1 receives, from the base station 10-1, the information of the resources related to the scheduling addressed to itself (the scheduling information of the operator 1). In S56, the terminal 20-1 receives, from the base station 10-2, the information of the resources related to the scheduling for SL transmission in the operator 2 (e.g., the scheduling information for SL transmission to one or more terminals 20 in the operator 2).

[0204] In S57, the terminal 20-1 performs transmission control. Here, as described above, for example, when part or all of the resources allocated for SL transmission to the terminal 20-1 from the base station 10-1 overlap with part or all of the resources received in S56 (e.g., SL transmission resources in other operators), the terminal 20-1 may perform a predetermined operation. Examples of the predetermined operation are as described above.

[0205] <Scheduling method> In Embodiment 5, the scheduling of resources (SL resources) for SL transmission from the base station 10 to the terminal 20 may be performed by a signal addressed to a single terminal 20 (e.g., UE-specific signal), or may be performed by a signal addressed to a plurality of terminals 20 (e.g., Group-common signal).

[0206] Among the signals addressed to a plurality of terminals 20, information on the SL resources allocated to each terminal 20 may be included. Also, among the signals addressed to a plurality of terminals 20, information related to feedback to the base station 10 (e.g., PUCCH slot, PUCCH resource, SAI, DAI, etc.) may be included. Also, among the signals addressed to a plurality of terminals 20, both information on the SL resources allocated to each terminal 20 and information related to feedback to the base station 10 may be included.

[0207] As described above, when scheduling information (such as information on SL resources) allocated to each terminal 20 is included in the signals addressed to a plurality of terminals 20, the terminal 20 may determine the scheduling information addressed to itself based on at least one of the following (1) to (3).

[0208] (1) Determine based on the RNTI that scrambles the CRC of the DCI. For example, when the terminal 20 can decode the DCI with a specific RNTI, the terminal 20 determines that the DCI is addressed to itself.

[0209] (2) The terminal 20 determines that the X-th scheduling information among the N (N≥0) pieces of scheduling information included in the signal addressed to multiple terminals 20 is the scheduling information addressed to itself. Here, X may be specified by the base station 10 to the terminal 20 as a higher-layer parameter such as an RRC signal or a MAC CE.

[0210] (3) Determine based on the UE-ID included in the signal addressed to multiple terminals 20. For example, if the terminal 20's own UE-ID is included in the signal addressed to multiple terminals 20, the terminal 20 determines that the scheduling information of the signal is addressed to itself.

[0211] In the signal addressed to multiple terminals 20, the predetermined parameter may be common among the multiple terminals 20. Here, the predetermined parameter is, for example, MCS, time-domain resource, etc.

[0212] <Method for receiving scheduling information from multiple base stations> Referring to FIGS. 32 and 33, an example in which the terminal 20 receives scheduling information from multiple base stations 10 will be described. Similar to the previous examples, the base station 10-1 and the terminal 20-1 belong to operator 1, and the base station 10-2 and the terminal 20-2 belong to operator 2.

[0213] In the example of FIG. 32, the terminal 20-1 receives the scheduling information addressed to itself from the base station 10-1 by UE-specific DCI. Also, the terminal 20-1 receives the scheduling information of the SL transmission in operator 2 by the method described in, for example, FIGS. 30 or 31.

[0214] In the example of FIG. 33, the terminal 20-1 receives group-common scheduling information from the base station 10-1 by means of group-common DCI. Further, the terminal 20-1 receives scheduling information for SL transmission in operator 2 by, for example, the method described with reference to FIG. 30 or FIG. 31. Here, an example is shown in which scheduling information for the terminal 20 under the control of operator 2 is transmitted from the base station 10-2 of operator 2 by means of group-common DCI.

[0215] In any of the examples of FIGS. 32 and 33, for example, when a part or all of the resources allocated for SL transmission to the terminal 20-1 from the base station 10-1 overlap with a part or all of the SL transmission resources in operator 2, the terminal 20-1 can perform the above-described predetermined operation.

[0216] Further, the terminal 20 may receive a plurality of DCIs related to different RNTIs from the base stations 10 of each operator. At this time, the terminal 20 may determine that the scheduling information is for another terminal 20 other than the scheduling information for itself and that the scheduling information cannot be used. An example in the case where the base station 10-1 and the terminal 20-1 belong to operator 1 and the base station 10-2 and the terminal 20-2 belong to operator 2 will be described.

[0217] For example, in operator 1, the base station 10-1 transmits a plurality of DCIs in which a plurality of RNTI values to be received by a plurality of terminals 20 under the control of operator 1 are set. For example, the base station 10-1 transmits a DCI in which RNTI-A is set, which is to be received by the terminal 20-1, and a DCI in which RNTI-B is set, which is to be received by another terminal, the terminal 21-1. Here, an example using a plurality of RNTIs is shown, but a single RNTI may be set to identify the scheduling information for itself other than the RNTI.

[0218] Similarly in Operator 2, base station 10-2 transmits a plurality of DCIs in which a plurality of RNTI values to be received by a plurality of terminals 20 under the control of Operator 2 are set. In this case, terminal 20-1 of Operator 1 determines that all DCIs received from base station 10-2 correspond to scheduling information for other terminals 20.

[0219] <Assumed example of reception> Terminal 20 may be assumed to receive signals addressed to a plurality of terminals 20 from each operator at each operator's PDCCH monitoring occasion. For example, in the example of FIG. 33, it may be assumed that terminal 20-1 receives Group common DCI as signals addressed to a plurality of terminals 20 from each of base stations 10-1 and 10-2 at each operator's PDCCH monitoring occasion.

[0220] If terminal 20 does not receive signals addressed to a plurality of terminals 20 from at least one of the plurality of operators for which reception is assumed at the corresponding PDCCH monitoring occasion, it may be determined that SL transmission is not performed on the SL resource corresponding to that occasion. Also, if the SL resource corresponding to that occasion has been allocated, transmission on that SL resource may be stopped. This is because it is assumed that the reception quality of the SL signal deteriorates at that occasion.

[0221] Also, when a predetermined parameter set is notified to terminal 20 from the base station 10 of any operator, it may mean that no SL resource allocation is performed for terminal 20. Also, terminal 20 may be able to receive SL scheduling addressed to itself from the base stations 10 of a plurality of operators. Also, terminal 20-1 may report the scheduling information received from base station 10-1 to base station 10-2.

[0222] <Effect of Example 5> According to Example 5, the terminal 20 can execute a transmission collision avoidance operation based on the scheduling status of each operator.

[0223] (Other examples) For any of Examples 1 to 5, the base station 10 may be replaced with a terminal 20 different from the terminal 20 under the control of the base station 10, and Examples 1 to 5 may be implemented. That is, for any of Examples 1 to 5, the technique of the example may be applied to the operation in which a certain terminal 20 sets (or allocates) the transmission resources of another terminal 20.

[0224] For any of Examples 1 to 5, the terminal 20 may be any terminal, which may be a V2X terminal or a terminal other than a V2X terminal that performs D2D.

[0225] Also, for any of Examples 1 to 5, the operation may be performed only in a specific resource pool. For example, for any of Examples 1 to 5, the operation may be performed only in a resource pool that can be used by terminals 20 after Rel-17.

[0226] (Device configuration) Next, an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include functions for implementing the above-described Examples 1 to 5. However, the base station 10 and the terminal 20 may each have only the functions of any one of Examples 1 to 5.

[0227] <Base station 10> FIG. 34 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 34, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 34 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional division and the names of the functional units may be any. The transmission unit 110 and the reception unit 120 may be called a communication unit.

[0228] The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining information of, for example, a higher layer from the received signals. Further, the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20.

[0229] The setting unit 130 stores setting information set in advance and various setting information to be transmitted to the terminal 20 in a storage device, and reads it out from the storage device as necessary. The setting information is read out from the setting unit 130 and transmitted to the terminal 20 by the transmitting unit 110.

[0230] The control unit 140 performs, for example, resource allocation, control of the entire base station 10, etc. Note that a functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Also, the transmitting unit 110 and the receiving unit 120 may be referred to as a transmitter and a receiver, respectively.

[0231] <Terminal 20> FIG. 35 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 35, the terminal 20 includes a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 35 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional classification and the names of the functional units may be any. The transmitting unit 210 and the receiving unit 220 may be referred to as a communication unit.

[0232] The transmitting unit 210 creates a transmission signal from transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and obtains a signal of a higher layer from the received physical layer signal.

[0233] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as necessary. Further, the setting unit 230 also stores preset setting information. The control unit 240 executes control such as determination of the availability of SL transmission using the allocated resources.

[0234] Note that 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 receiving unit 220. Further, the transmission unit 210 and the receiving unit 220 may be referred to as a transmitter and a receiver, respectively.

[0235] According to the present embodiment, at least a terminal, a base station, and a transmission method described in each of the following items are provided. Hereinafter, they will be described for each related example.

[0236] <Examples 1 to 3> (Item 1) A receiving unit that receives resource allocation information for sidelink transmission from a base station of a first operator, A control unit that determines whether to perform sidelink transmission using the resource based on a sidelink signal received from a terminal of a second operator, A transmission unit that performs sidelink transmission using the resource when it is determined to perform sidelink transmission using the resource A terminal comprising: (Item 2) A plurality of resources for sidelink transmission are allocated to the terminal, The control unit selects available resources from the plurality of resources based on the sidelink signal The terminal according to Item 1. (Item 3) The control unit determines a resource for feedback to be transmitted to the base station based on a specific resource among the plurality of resources The terminal according to Item 2. (Item 4) When sidelink transmission using the resources allocated from the base station is not performed, the transmission unit transmits a NACK to the base station. The terminal according to any one of claims 1 to 3. (Claim 5) In the first operator and the second operator, some of the resource pools in the sidelink reception resource pool are resource pools for sidelink transmission. The terminal according to any one of claims 1 to 4. (Claim 6) Receiving resource allocation information for sidelink transmission from the base station of the first operator; Based on the sidelink signal received from the terminal of the second operator, determining whether to perform sidelink transmission using the resource; When it is determined to perform sidelink transmission using the resource, executing sidelink transmission using the resource A transmission method executed by a terminal, comprising:

[0237] According to any of claims 1 to 6, a technique is provided that enables avoidance of collisions in sidelink transmission between terminals of different operators. In particular, according to claim 2, since a certain resource can be selected from a plurality of resources, flexible control becomes possible. According to claim 3, the resource for feedback (e.g., timing) can be clarified. According to claim 4, the base station can grasp the collision situation. According to claim 5, for example, collision avoidance can be achieved by dividing the resource pool for sidelink transmission between operators.

[0238] <Example 4> (Claim 1) A receiving unit that receives resource allocation information for sidelink transmission in at least one of the first operator and the second operator from the base station of the first operator; A control unit that determines whether to perform sidelink transmission using the resources allocated from the base station based on the resource allocation information of the resources; A transmission unit that, when it is determined to perform the sidelink transmission, executes the sidelink transmission A terminal comprising: (Item 2) The transmission unit transmits the resource allocation information received from the base station by sidelink The terminal according to Item 1. (Item 3) A receiving unit that receives, by sidelink, resource allocation information for sidelink transmission in a first operator; A control unit that determines whether to perform sidelink transmission based on the resource allocation information of the resources; A transmission unit that, when it is determined to perform the sidelink transmission, executes the sidelink transmission A terminal comprising: (Item 4) The transmission unit transmits the resource allocation information to the base station of a second operator. The terminal according to Item 3. (Item 5) A receiving unit that receives, by uplink, resource allocation information for sidelink transmission in a first operator; A control unit that determines resources for sidelink transmission by a terminal of a second operator based on the resource allocation information of the resources; A transmission unit that transmits the resource allocation information determined by the control unit to the terminal of the second operator. A base station comprising: (Item 6) Receiving, from a base station of a first operator, resource allocation information for sidelink transmission in at least one of the first operator and the second operator; Determining whether to perform sidelink transmission using the resources allocated from the base station based on the resource allocation information of the resources; When it is determined that the sidelink transmission is to be performed, a step of executing the sidelink transmission A transmission method executed by a terminal, comprising:

[0239] According to any one of items 1 to 6, a technique is provided that enables avoiding collisions of sidelink transmissions between terminals of different operators. In particular, according to item 2, the receiving side of the sidelink can know the resource allocation information of other operators. According to item 4, the base station can know the resource allocation information of other operators.

[0240] <Example 5> (Item 1) A receiving unit that receives, from a base station of a first operator, first resource allocation information that is resource allocation information for sidelink transmission in the first operator, and receives, from a base station of a second operator, second resource allocation information that is resource allocation information for sidelink transmission in the second operator; A control unit that determines whether to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information; A transmission unit that, when it is determined that the sidelink transmission is to be performed, executes the sidelink transmission A terminal comprising: (Item 2) After PRACH transmission is performed on the base station of the second operator by the transmission unit, the receiving unit receives, from the base station of the second operator, setting information for receiving the second resource allocation information The terminal according to item 1. (Item 3) The receiving unit receives a signal transmitted to a plurality of terminals by the base station of the first operator, and acquires the first resource allocation information from the signal The terminal according to item 1 or item 2. (Item 4) The receiving unit is assumed to receive signals addressed to a plurality of terminals from the base stations of respective operators at each PDCCH monitoring opportunity. When signals addressed to a plurality of terminals are not received at a certain PDCCH monitoring opportunity, the transmitting unit does not perform sidelink transmission using resources corresponding to the certain PDCCH monitoring opportunity. The terminal according to any one of claims 1 to 3. (Claim 5) A transmitting unit that transmits to the terminal first resource allocation information that is resource allocation information for sidelink transmission in a first operator; In the terminal that has received second resource allocation information that is resource allocation information for sidelink transmission in a second operator from a base station of the second operator, when it is determined not to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information, a receiving unit that receives a NACK from the terminal A base station comprising: (Claim 6) A step of receiving first resource allocation information that is resource allocation information for sidelink transmission in a first operator from a base station of the first operator and receiving second resource allocation information that is resource allocation information for sidelink transmission in a second operator from a base station of the second operator; A step of determining whether to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information; A step of executing the sidelink transmission when it is determined to perform the sidelink transmission A transmission method executed by a terminal, comprising:

[0241] According to any one of claims 1 to 6, a technique is provided that enables avoidance of side link transmission collisions between terminals of different operators. In particular, according to claim 2, setting information can be received from a base station of another operator without establishing an RRC connection. According to claim 3, information addressed to itself can be acquired from signals transmitted to a plurality of terminals. According to claim 4, for example, SL transmission can be performed in a situation with good radio quality.

[0242] (Hardware Configuration) The block diagrams (FIGS. 34 and 35) used in the description of the above embodiment show blocks of functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0243] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication, forwarding, configuration, reconfiguration, allocation (allocating, mapping), assignment, etc. For example, a functional block (component) that functions as transmission is called a transmission unit or a transmitter. In any case, as described above, the realization method is not particularly limited.

[0244] For example, the base station 10, the terminal 20, etc. in one embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 36 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to one embodiment of the present disclosure. Physically, the above-described base station 10 and terminal 20 may be configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0245] In the following description, the term "device" 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 each device shown in the figure, or may be configured without including some devices.

[0246] Each function in the base station 10 and the terminal 20 is realized by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls communication by the communication device 1004, or controls at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0247] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, the above-described control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0248] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 34 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 35 may be stored in the storage device 1002 and realized by a control program that operates on the processor 1001. Although it has been described that the above various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0249] The storage device 1002 is a computer-readable recording medium, and may be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store a program (program code), software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0250] The auxiliary storage device 1003 is a computer-readable recording medium, and may be constituted by, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The auxiliary storage device 1003 may also be called an auxiliary storage. The above-described storage medium may be, for example, a database including at least one of the storage device 1002 and the auxiliary storage device 1003, a server, or other appropriate media.

[0251] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be implemented by the communication device 1004. The transmission / reception unit may be physically or logically separated into a transmission unit and a reception unit.

[0252] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0253] In addition, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0254] In addition, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0255] (Supplement to the Embodiment) The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating the understanding of the invention, unless otherwise specified, these numerical values are merely examples and any appropriate values may be used. The classification of items in the above description is not essential to the present invention, and the matters described in two or more items may be used in combination as needed, or the matters described in one item may be applied to the matters described in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or conversely, the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software that operates by the processor included in the base station 10 according to the embodiment of the present invention and the software that operates by the processor included in the terminal 20 according to the embodiment of the present invention may be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk drive (HDD), a removable disk, a CD-ROM, a database, a server, or any other appropriate storage medium, respectively.

[0256] Furthermore, the notification of information is not limited to the aspects / embodiments described in this disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0257] Each aspect / embodiment described in this disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based thereon. Also, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0258] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be reordered as long as there is no contradiction. For example, regarding the methods described in this disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0259] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0260] The information or signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0261] The input and output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0262] The determination in this disclosure may be made based on a value represented by 1 bit (0 or 1), or may be made based on a Boolean value (true or false), or may be made by comparing numerical values (for example, comparison with a predetermined value).

[0263] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0264] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cables, fiber optic cables, twisted pairs, digital subscriber line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0265] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0266] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0267] The terms "system" and "network" used in this disclosure are used interchangeably.

[0268] Also, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or using other corresponding information. For example, a radio resource may be indicated by an index.

[0269] The names used for the above-described parameters are not limiting names in any way. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUSCH, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0270] In the present disclosure, terms such as "base station (BS:Base Station)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be called by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0271] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

[0272] In this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0273] A mobile station may also be called 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, terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0274] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or unmanned). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0275] In addition, the base station in the present disclosure may be replaced by a terminal. For example, for a configuration in which communication between the base station and the terminal is replaced by communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be replaced with a side channel.

[0276] Similarly, the terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described terminal may be configured to be functions of the base station.

[0277] As used herein, the terms "determining" and "deciding" may encompass a wide variety of actions. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory), and the like. Additionally, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on performing some action. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", or the like.

[0278] The terms "connected" or "coupled," or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed." As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electric wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region, etc.

[0279] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0280] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on."

[0281] Any reference to an element using designations such as "first," "second," etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0282] In the configuration of each of the above devices, "means" may be replaced with "section," "circuit," "device," etc.

[0283] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0284] A wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be referred to as a subframe. A subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0285] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate, for example, at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0286] A slot may be composed of one or more symbols (such as 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 numerology.

[0287] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0288] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0289] For example, one sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0290] Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of the TTI is not limited to this.

[0291] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling or link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0292] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit of scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

[0293] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0294] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of a long TTI and not less than 1 ms.

[0295] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0296] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0297] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0298] Also, the resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource area of 1 sub-carrier and 1 symbol.

[0299] The bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0300] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within one carrier for the UE.

[0301] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0302] The structures such as the above-mentioned radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0303] In the present disclosure, for example, when an article is added by translation like a, an, and the in English, the present disclosure may include that the noun following these articles is in the plural form.

[0304] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". Note that the term may also mean "A and B are each different from C". Terms such as "separate", "coupled", etc. may also be interpreted in the same way as "different".

[0305] In the present disclosure, each aspect / embodiment described may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, without performing the notification of the predetermined information).

[0306] Note that in the present disclosure, the SS block or CSI-RS is an example of a synchronization signal or a reference signal.

[0307] As described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and changed 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 for illustrative purposes only and does not have any limiting meaning for the present disclosure.

Explanation of Signs

[0308] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A receiving unit that receives first resource allocation information, which is resource allocation information for sidelink transmission in the first operator, from a base station of the first operator, and receives second resource allocation information, which is resource allocation information for sidelink transmission in the second operator, from a base station of the second operator; A control unit that determines whether to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information; A terminal comprising a transmission unit that executes the sidelink transmission when it is determined to perform the sidelink transmission, wherein the receiving unit is assumed to receive signals addressed to a plurality of terminals from the base stations of each operator at each PDCCCH monitoring occasion, and when the signals addressed to the plurality of terminals are not received at a certain PDCCCH monitoring occasion, the transmission unit does not perform sidelink transmission using the resources corresponding to the certain PDCCCH monitoring occasion Terminal.

2. After a PRACH transmission is made to the base station of the second operator by the transmission unit, the receiving unit receives setting information for receiving the second resource allocation information from the base station of the second operator The terminal according to claim 1.

3. The receiving unit receives a signal transmitted to a plurality of terminals by the base station of the first operator, and acquires the first resource allocation information from the signal The terminal according to claim 1 or 2.

4. A transmission unit that transmits first resource allocation information, which is resource allocation information for sidelink transmission in the first operator, to a terminal; In the terminal that has received second resource allocation information, which is resource allocation information for sidelink transmission in the second operator, from a base station of the second operator, when it is determined not to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information, a receiving unit that receives a NACK from the terminal, a base station comprising The terminal is assumed to receive signals addressed to a plurality of terminals from the base stations of respective operators at each PDCCCH monitoring opportunity. When the terminal does not receive signals addressed to a plurality of terminals at a certain PDCCCH monitoring opportunity, the terminal does not perform sidelink transmission using the resources corresponding to the certain PDCCCH monitoring opportunity. Base station.

5. A receiving step of receiving first resource allocation information, which is resource allocation information for sidelink transmission in the first operator, from the base station of the first operator, and receiving second resource allocation information, which is resource allocation information for sidelink transmission in the second operator, from the base station of the second operator; A step of determining whether to perform sidelink transmission using the resources allocated by the first resource allocation information based on the second resource allocation information; A transmission method executed by a terminal, comprising a transmission step of executing the sidelink transmission when it is determined to perform the sidelink transmission. In the receiving step, the terminal is assumed to receive signals addressed to a plurality of terminals from the base stations of respective operators at each PDCCCH monitoring opportunity. When the terminal does not receive signals addressed to a plurality of terminals at a certain PDCCCH monitoring opportunity, in the transmission step, the terminal does not perform sidelink transmission using the resources corresponding to the certain PDCCCH monitoring opportunity. Transmission method.

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