Terminal, base station, and transmission method

Abstract

The terminal has a reception section that receives allocation information of resources for sidelink transmission by at least one of a first operator and a second operator from a base station of the first operator, a control section that determines whether to perform sidelink transmission using the resources allocated from the base station based on the allocation information of the resources, and a transmission section that performs the sidelink transmission in a case where it is determined to perform the sidelink transmission.

Description

Technical Field

[0001] This invention relates to terminals and base stations in wireless communication systems. Background Technology

[0002] In LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also known as 5G)), D2D technology, which enables direct communication between terminals without going through a base station, has been introduced.

[0003] D2D reduces the traffic load between terminals and base stations, enabling communication between terminals even when base stations cannot communicate, such as during disasters. Furthermore, in 3GPP (3rd Generation Partnership Project), D2D is referred to as a "sidelink," therefore, this specification will primarily use the term "sidelink."

[0004] Sidelink communication is broadly divided into discovery, used to find other terminals capable of communication, and communication, used for direct communication between terminals (also known as D2D direct communication, etc.). Hereinafter, without specifically distinguishing between communication and discovery, it will be referred to simply as sidelink. Various use cases related to V2X (Vehicle to Everything) services in NR are being investigated.

[0005] Existing technical documents

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 38.331V16.1.0 (2020-07)

[0008] Non-patent document 2: 3GPP TS 38.214V16.2.0 (2020-06)

[0009] Non-patent document 3: 3GPP TS 38.321V16.1.0 (2020-07) Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] It is conceivable that sidelink services are provided by multiple different operators (also known as communication operators) in the same area.

[0012] In a mode where resources for sidelink transmission are allocated from the base station to the terminal, in an environment with multiple operators as described above, sidelink transmissions may occur that are beyond the control of any single operator. Therefore, sidelink transmission conflicts may occur between terminals from different operators.

[0013] The present invention was made in view of the above-mentioned problems, and its object is to provide a technology that can avoid sidelink transmission conflicts between terminals of different operators.

[0014] Methods for solving problems

[0015] According to the disclosed technology, a terminal is provided, comprising: a receiving unit that receives from a base station of a first operator the allocation information of resources transmitted via a sidelink from at least one of a first operator and a second operator; a control unit that determines, based on the resource allocation information, whether sidelink transmission using resources allocated from the base station is performed; and a transmitting unit that performs the sidelink transmission when it is determined that sidelink transmission is to be performed.

[0016] Invention Effects

[0017] Based on publicly available technology, a technology is provided that can avoid sidelink transmission conflicts between terminals of different operators. Attached Figure Description

[0018] Figure 1 This is a diagram used to illustrate V2X.

[0019] Figure 2 This is a diagram used to illustrate the transmission mode of V2X (1).

[0020] Figure 3 This is a diagram used to illustrate the transmission mode of V2X (2).

[0021] Figure 4 This is a diagram used to illustrate the transmission mode of V2X (3).

[0022] Figure 5 This is a diagram used to illustrate the transmission mode of V2X (4).

[0023] Figure 6 This is a diagram used to illustrate the transmission mode of V2X (5).

[0024] Figure 7 This is a diagram illustrating example (1) of the communication types in V2X.

[0025] Figure 8 This is a diagram used to illustrate example (2) of the V2X communication type.

[0026] Figure 9This is a diagram used to illustrate the communication type of V2X (3).

[0027] Figure 10 This is a timing diagram showing the action example (1) of V2X.

[0028] Figure 11 This is a timing diagram showing the action example (2) of V2X.

[0029] Figure 12 This is a timing diagram showing the action example (3) of V2X.

[0030] Figure 13 This is a timing diagram showing the action example (4) of V2X.

[0031] Figure 14 This is a diagram illustrating an example of a monitored action.

[0032] Figure 15 This is a diagram showing an example of some monitored actions.

[0033] Figure 16 This is a flowchart illustrating an example of re-evaluation.

[0034] Figure 17 This is a diagram illustrating an example of re-evaluation.

[0035] Figure 18 This is a flowchart illustrating an example of preemption.

[0036] Figure 19 This is a diagram used to illustrate mode 1.

[0037] Figure 20 This is a diagram used to illustrate mode 1.

[0038] Figure 21 This is a diagram used to illustrate mode 1.

[0039] Figure 22 This is a diagram used to illustrate Example 1.

[0040] Figure 23 This is a diagram used to illustrate Example 1.

[0041] Figure 24 This is a diagram used to illustrate Example 1.

[0042] Figure 25 This is a diagram used to illustrate Example 2.

[0043] Figure 26 This is a diagram used to illustrate Example 4.

[0044] Figure 27 This is a diagram used to illustrate Example 4.

[0045] Figure 28 This is a diagram used to illustrate Example 4.

[0046] Figure 29 This is a diagram used to illustrate Example 4.

[0047] Figure 30 This is a diagram used to illustrate Example 5.

[0048] Figure 31 This is a diagram used to illustrate Example 5.

[0049] Figure 32 This is a diagram used to illustrate Example 5.

[0050] Figure 33 This is a diagram used to illustrate Example 5.

[0051] Figure 34 This is a diagram illustrating an example of the functional structure of base station 10 in an embodiment of the present invention.

[0052] Figure 35 This is a diagram illustrating an example of the functional structure of terminal 20 in an embodiment of the present invention.

[0053] Figure 36 This is a diagram illustrating an example of the hardware structure of a base station 10 or a terminal 20 in an embodiment of the present invention. Detailed Implementation

[0054] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, the embodiments described below are merely examples, and the application of the present invention is not limited to the embodiments described below.

[0055] When the wireless communication system according to the embodiments of the present invention is in operation, existing technology is appropriately used. However, this existing technology is, for example, existing NR (e.g., technology not disclosed in Patent Documents 1-3) or existing LTE, but is not limited to existing NR or existing LTE. Furthermore, unless otherwise stated, the term "LTE" as used in this specification has a broad meaning that includes LTE-Advanced and LTE-Advanced and beyond (e.g., NR) or wireless LAN (Local Area Network).

[0056] Furthermore, in embodiments of the present invention, the duplex mode can be TDD (Time Division Duplex), FDD (Frequency Division Duplex), or other modes (e.g., Flexible Duplex).

[0057] Furthermore, in the embodiments of the present invention, "resources" can be time resources, frequency resources, or time-frequency resources.

[0058] Furthermore, in embodiments of the present invention, the “configure” wireless parameters can be preset values ​​or wireless parameters notified from base station 10 or terminal 20.

[0059] Furthermore, the following description, as an example, illustrates the operations of higher layers (e.g., the MAC layer) and lower layers (e.g., the PHY layer) in the terminal. The functional distinction between higher and lower layers is merely an example; the operations described below may also be performed without distinguishing between higher and lower layers.

[0060] Figure 1 This diagram illustrates V2X. Within 3GPP, technologies for implementing V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality are being researched and standardized. Figure 1 As shown, V2X is a part of ITS (Intelligent Transport Systems). It is a collective term for V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure), V2N (Vehicle to Network), and V2P (Vehicle to Pedestrian), which are communication forms between vehicles, roadside units (RSUs) located beside the road.

[0061] Furthermore, 3GPP is researching V2X using LTE or NR cellular communication and inter-terminal communication. V2X using cellular communication is also referred to as cellular V2X. In NR V2X, research is underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0062] Regarding V2X in LTE or NR, it's conceivable that future research will extend beyond 3GPP specifications. For example, research could focus on ensuring interoperability, reducing costs incurred due to higher-level installations, methods for the concurrent use or switching of multiple RATs (Radio Access Technologies), regulatory support in various countries, and methods for data acquisition, distribution, database management, and usage on LTE or NR V2X platforms.

[0063] In embodiments of the present invention, the primary concept is that the communication device (also referred to as a terminal) is mounted on a vehicle; however, embodiments of the present invention are not limited to this method. For example, the communication device can be a terminal held by a person, a device mounted on a drone or aircraft, or a base station, RSU, relay station (Relay Node), terminal with scheduling capabilities, etc. Here, the vehicle carrying the communication device can also be referred to as a terminal.

[0064] Additionally, SL (Sidelink) can also be distinguished by UL (Uplink) or DL ​​(Downlink) and any one or a combination of 1)-4) below. Furthermore, SL can also be other names.

[0065] 1) Resource allocation in the time domain

[0066] 2) Frequency domain resource allocation

[0067] 3) Reference synchronization signals (including SLSS (Sidelink Synchronization Signal))

[0068] 4) Reference signal used in path loss measurement for transmission power control

[0069] In addition, for SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of the following can be used: CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), OFDM without transform precoding, or OFDM with transform precoding.

[0070] In LTE's SL (Send-On) architecture, two modes, Mode 3 and Mode 4, are specified for resource allocation to terminal 20. In Mode 3, transmission resources are dynamically allocated using DCI (Downlink Control Information) sent from base station 10 to terminal 20. Furthermore, SPS (Semi-Persistent Scheduling) is also possible in Mode 3. In Mode 4, terminal 20 autonomously selects transmission resources from the resource pool.

[0071] In the NR SL, regarding resource allocation for the SL to terminal 20, Mode 1 and Mode 2 are specified. In Mode 1, transmission resources are allocated using the DCI sent from base station 10 to terminal 20. In Mode 2, terminal 20 autonomously selects transmission resources from the resource pool.

[0072] In addition, the slot in the embodiments of the present invention can also be replaced by symbol, mini slot, subframe, radio frame, or TTI (Transmission Time Interval). Furthermore, the cell in the embodiments of the present invention can also be replaced by cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.

[0073] In embodiments of the present invention, terminal 20 is not limited to V2X terminals, but can be any type of terminal performing D2D communication. For example, terminal 20 can be a user-owned terminal such as a smartphone, or an IoT (Internet of Things) device such as a smart meter. Furthermore, the terminal can also be referred to as a "UE".

[0074] (Examples of the system's basic structure and basic operations)

[0075] The following explanation Figures 2 to 13 An example of the system structure in this embodiment is shown, and an example of the basic operations in the system of this embodiment is also shown.

[0076] like Figure 2 As shown, the wireless communication system of this embodiment includes terminal 20A, terminal 20B, and base station 10. However, in practice, multiple terminals may exist, but... Figure 2 Terminals 20A and 20B are shown as examples.

[0077] Unless otherwise specified, terminals 20A, 20B, etc., will be referred to as "Terminal 20" or "UE". Figure 2 As an example, this embodiment shows a scenario where both terminal 20A and terminal 20B are within the coverage area of ​​the cell. However, the operation in this embodiment can also be applied to a scenario where terminal 20 is outside the coverage area.

[0078] In addition, the terminal 20 does not need to be a housing device. For example, even if various sensors are distributed throughout the vehicle, the device including these various sensors can be the terminal 20.

[0079] Furthermore, the processing of data transmitted via the sidelink of terminal 20 is essentially the same as that of UL transmission in LTE or NR. For example, terminal 20 can scramble the codewords of the transmitted data, modulate them to generate complex-valued symbols, map these complex-valued symbols (transmitted signals) to layer 1 or layer 2, and pre-encode them. Then, they are mapped to resource elements to generate a transmitted signal (e.g., a complex-valued time-domain SC-FDMA signal) and transmitted from each antenna port.

[0080] Regarding base station 10, it has the function of cellular communication as a base station in LTE or NR, and the function of enabling terminal 20 in this embodiment to communicate (e.g., resource pool setting, resource allocation, etc.). Furthermore, base station 10 can also be an RSU (gNB type RSU). Base station 10 is a communication device that provides one or more cells and wirelessly communicates with terminal 20. The physical resources of the wireless signal are defined in the time domain and frequency domain. The time domain can be defined by the number of OFDM symbols, and the frequency domain can be defined by the number of subcarriers or the number of resource blocks. Furthermore, the TTI (Transmission Time Interval) in the time domain can be a time slot, a subframe, or a symbol.

[0081] Furthermore, in the wireless communication system of this embodiment, the signal waveform used by terminal 20 in SL or UL can be OFDMA, SC-FDMA, or other signal waveforms.

[0082] exist Figure 2 In the example shown, the transmitting terminal 20A can also be referred to as TX-UE, and the receiving terminal 20B can be referred to as RX-UE.

[0083] Figure 2 This is also a diagram illustrating the action example in example (1) used to explain the V2X transmission mode. In Figure 2In the sidelink communication transmission mode shown, in step 1, base station 10 sends sidelink scheduling information to terminal 20A. Then, terminal 20A, based on the received scheduling information, sends a PSCCH (Physical Sidelink Control Channel) and transmits data (or control information) to terminal 20B via a PSSCH (Physical Sidelink Shared Channel) (step 2). Alternatively, sending control information via PSCCH can be represented as "sending PSCCH," and sending data (or control information) via PSSCH can also be represented as "sending PSSCH."

[0084] You can also Figure 2 The sidelink communication transmission mode shown is called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 of LTE, sidelink scheduling is performed based on Uu. Uu refers to the radio interface between the UTRAN (Universal Terrestrial Radio Access Network) and the UE (User Equipment). Furthermore, it is also possible to... Figure 2 The sidelink communication transmission mode shown is called sidelink transmission mode 1 in NR.

[0085] Figure 3 This is a diagram illustrating the action example in example (2) of the V2X transmission mode. In Figure 3 In the side-link communication transmission mode shown, in step 1, terminal 20A uses autonomously selected resources to send PSCCH and PSSCH to terminal 20B. Alternatively... Figure 3 The sidelink communication transmission mode shown is called sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, terminal 20A performs resource selection itself. Figure 3 The sidelink communication transmission mode shown is called sidelink transmission mode 2 in NR. In sidelink transmission mode 2 in NR, terminal 20A performs resource selection itself.

[0086] Figure 4 This is a diagram illustrating the action example in example (3) of the V2X transmission mode. In Figure 4 In the side-link communication transmission mode shown, in step 1, terminal 20A uses autonomously selected resources to send PSCCH and PSSCH to terminal 20B. Similarly, terminal 20B uses autonomously selected resources to send PSCCH and PSSCH to terminal 20A (step 1). Alternatively... Figure 4The sidelink communication transmission mode shown is called sidelink transmission mode 2 or transmission mode 2a in NR. In sidelink transmission mode 2 in NR, terminal 20 performs resource selection itself.

[0087] Figure 5 This is a diagram illustrating the action example in example (4) used to explain the transmission mode of V2X. In Figure 5 In the sidelink communication transmission mode shown, in step 0, base station 10 sets and transmits the sidelink resource mode to terminal 20A via RRC (Radio Resource Control). Alternatively, the sidelink resource mode is preset for terminal 20A. Then, terminal device 20A sends PSSCH (step 1) to terminal 20B according to the received or preset resource mode. Alternatively... Figure 5 The sidelink communication transmission mode shown is called sidelink transmission mode 2c in NR.

[0088] Figure 6 This is a diagram illustrating the action example in example (5) used to explain the transmission mode of V2X. In Figure 6 In the sidelink communication transmission mode shown, in step 1, terminal 20A sends sidelink scheduling information to terminal 20B via PSCCH. Then, terminal 20B sends PSSCH to terminal 20A according to the received scheduling information (step 2). Alternatively... Figure 6 The sidelink communication transmission mode shown is called sidelink transmission mode 2d in NR.

[0089] Figure 7 This is a diagram illustrating the action example in example (1) of the V2X communication type. Figure 7 The communication type of the side link shown is unicast. Terminal 20A sends PSCCH and PSSCH to terminal 20. Figure 7 In the example shown, terminal 20A unicasts to terminal 20B and unicasts to terminal 20C.

[0090] Figure 8 This is a diagram illustrating the action example in example (2) of the V2X communication type. Figure 8 The sidelink communication type shown is multicast. Terminal 20A sends PSCCH and PSSCH to one or more groups to which terminal 20 belongs. Figure 8 In the example shown, the group includes terminal 20B and terminal 20C, and terminal 20A multicasts to the group.

[0091] Figure 9 This is a diagram illustrating the action example in example (3) of the V2X communication type. Figure 9The sidelink communication type shown is broadcast. Terminal 20A sends PSCCH and PSSCH to one or more terminals 20. Figure 9 In the example shown, terminal 20A broadcasts to terminals 20B, 20C, and 20D. Alternatively, it can also... Figures 7-9 The terminal 20A shown is called the header UE.

[0092] Furthermore, NR-V2X supports HARQ (Hybrid Automatic Repeat Request) in both unicast and multicast on sidelinks. Additionally, NR-V2X defines SFCI (Sidelink Feedback Control Information) that includes HARQ responses. SFCI is sent via PSFCH (Physical Sidelink Feedback Channel).

[0093] Furthermore, in the following description, it is assumed that PSFCH is used for HARQ-ACK transmission in the side link, but this is only one example. For example, PSCCH, PSSCH, and other channels can be used for HARQ-ACK transmission in the side link.

[0094] For ease of explanation, all information reported by terminal 20 in HARQ will be referred to as HARQ-ACK. This HARQ-ACK can also be called HARQ-ACK information. More specifically, the codebook used for the HARQ-ACK information reported from terminal 20 to base station 10, etc., is called the HARQ-ACK codebook. The HARQ-ACK codebook specifies the bit string of the HARQ-ACK information. In addition to ACK, NACK is also sent using "HARQ-ACK".

[0095] Figure 10 This is a timing diagram showing an example of an action (1) related to the HARQ-ACK of V2X.

[0096] In step S101, terminal 20A autonomously selects resources from the PSCCH and PSSCH from a resource selection window with a predetermined period. The resource selection window can also be set by base station 10 for terminal 20. Furthermore, the resource selection process includes resource identification processing to determine the set of candidate resources and resource selection processing to select resources from the set.

[0097] In steps S102 and S103, terminal 20A uses the resources autonomously selected in step S101 to send SCI (Sidelink Control Information) via PSCCH (or PSSCH) and SL data via PSSCH. For example, terminal 20A can send PSCCH using frequency resources adjacent to the frequency resources of PSSCH, using time resources that are at least a portion of the same as the time resources of PSSCH.

[0098] Terminal 20B receives SCI (PSCCH or PSSCH) and SL data (PSSCH) sent from terminal 20A. The received SCI may contain information about the resources used by terminal 20B to send a HARQ-ACK for the received data via PSFCH. Terminal 20A may include information about resources it has autonomously selected (resource reservation information) in the SCI and send it.

[0099] In step S104, terminal 20B uses the resources of PSFCH determined by the received SCI to send HARQ-ACK for the received data to terminal 20A.

[0100] If the HARQ-ACK received in step S104 indicates a request for retransmission (i.e., a NACK (negative acknowledgment), then in step S105, terminal 20A retransmits the PSCCH and PSSCH to terminal 20B. Terminal 20A may use resources it autonomously selects to retransmit the PSCCH and PSSCH.

[0101] Alternatively, steps S104 and S105 can be omitted if HARQ feedback control is not performed.

[0102] Figure 11 This is a timing diagram showing an example of actions (2) related to HARQ-ACK in V2X. Blind retransmission, independent of HARQ control, can also be performed to improve transmission success rate or arrival distance.

[0103] In step S201, terminal 20A autonomously selects resources used in PSCCH and PSSCH from a resource selection window with a predetermined period. The resource selection window can also be set by base station 10 for terminal 20.

[0104] In steps S202 and S203, terminal 20A uses the resources autonomously selected in step S201 to send SCI via PSCCH (or PSSCH) and SL data via PSSCH. For example, terminal 20A can send PSCCH using frequency resources adjacent to the frequency resources of PSSCH, using time resources that are at least a portion of the same as the time resources of PSSCH.

[0105] In step S204, terminal 20A uses the resources autonomously selected in step S201 to retransmit SCI data based on PSCCH or PSSCH and SL data based on PSSCH to terminal 20B. The retransmission in step S204 can be performed multiple times.

[0106] Alternatively, step S204 can be omitted if blind retransmission is not performed.

[0107] Figure 12 This is a timing diagram illustrating an example of action (3) related to HARQ-ACK in V2X. Base station 10 can also perform sidelink scheduling. That is, base station 10 can also determine the resources of the sidelink used by terminal 20 and send information indicating those resources to terminal 20. Furthermore, in the case of applying HARQ control, base station 10 can also send information indicating the resources of PSFCH to terminal 20.

[0108] In step S301, base station 10 sends DCI (Downlink Control Information) to terminal 20A via PDCCH to perform SL scheduling. For ease of explanation, the DCI used for SL scheduling is referred to as SL scheduling DCI.

[0109] Furthermore, in step S301, base station 10 can send a DCI for DL ​​scheduling (also known as DL allocation) to terminal 20A via PDCCH. For ease of explanation, the DCI for DL ​​scheduling is referred to as DL scheduling DCI. Terminal 20A, upon receiving the DL scheduling DCI, uses the resources specified by the DL scheduling DCI to receive DL data via PDSCH.

[0110] In steps S302 and S303, terminal 20A uses the resources specified by the SL scheduling DCI to send SCI (Sidelink Control Information) via PSCCH (or PSSCH) and also sends SL data via PSSCH. Alternatively, the SL scheduling DCI may specify only the resources for PSSCH. In this case, for example, terminal 20A may send PSCCH using frequency resources adjacent to the frequency resources of PSSCH, while using time resources that share at least a portion of the time resources of PSSCH.

[0111] Terminal 20B receives SCI and SL data (PSSCH) sent from terminal 20A. The SCI received using PSCCH or PSSCH contains information about the resources of PSFCH used by terminal 20B to send HARQ-ACK for the received data.

[0112] The information about this resource can also be included in the DL scheduling DCI or SL scheduling DCI sent from base station 10 in step S301. Terminal 20A can also obtain the information about this resource from the DL scheduling DCI or SL scheduling DCI and include it in the SCI. Alternatively, the DCI sent from base station 10 can be configured not to include the information about this resource, and terminal 20A can autonomously include the information about this resource in the SCI and send it.

[0113] In step S304, terminal 20B uses the resources of PSFCH determined by the received SCI to send HARQ-ACK for the received data to terminal 20A.

[0114] In step S305, terminal 20A, for example, at a time specified by DL scheduling DCI (or SL scheduling DCI) (e.g., time in time slots), uses the PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or the SL scheduling DCI) to send HARQ-ACK, and base station 10 receives the HARQ-ACK.

[0115] Alternatively, if HARQ feedback control is not performed, at least one of steps S304 and S305 may not be performed.

[0116] Figure 13This is a timing diagram illustrating an example of action (4) related to HARQ-ACK in V2X. As described above, in the NR side link, it is supported to send HARQ responses via PSFCH. In addition, the format of PSFCH can, for example, be the same as PUCCH (Physical Uplink Control Channel) format 0. That is, the format of PSFCH can be a sequence-based format with a PRB (Physical Resource Block) size of 1, and ACK and NACK identified based on timing or cyclic shift (or both). The format of PSFCH is not limited to this. The resources of PSFCH can be configured in the symbols at the end of the time slot or multiple symbols at the end. In addition, a period N is set for the PSFCH resources or predefined. The period N can be set or predefined in units of time slots.

[0117] exist Figure 13 In the diagram, the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH can be configured as a single symbol at the beginning of a time slot, or as multiple symbols starting from the beginning, or as multiple symbols starting from symbols other than the beginning. The PSFCH can be configured as a single symbol at the end of a time slot, or as multiple symbols at the end of a time slot. Furthermore, "time slot beginning" can refer to the symbol that is the first symbol among the multiple symbols constituting a time slot that can be used for sidelinks (designated as symbol X), or it can refer to the first symbol among the symbols other than the first symbol of symbol X. Similarly, "time slot end" can refer to the last symbol of symbol X, or it can refer to the last symbol among the symbols other than the last symbol of symbol X. Figure 13 In the example shown, three sub-channels are configured in the resource pool, and two PSFCHs are configured after the three time slots configured with PSSCHs. The arrows from PSSCH to PSFCHs indicate an example of a PSFCH associated with a PSSCH.

[0118] Figure 13 This example illustrates multicast option 2 in NR-V2X where the HARQ response is either an ACK or a NACK. Figure 13As shown, in step S401, terminal 20A, acting as the sending terminal 20, performs multicast to terminals 20B, 20C, and 20D, acting as the receiving terminals 20, via SL-SCH. In the following step S402, terminal 20B sends a HARQ response to terminal 20A using PSFCH#B, terminal 20C sends a HARQ response to terminal 20A using PSFCH#C, and terminal 20D sends a HARQ response to terminal 20A using PSFCH#D. Furthermore, in multicast option 1, only NACK is sent as a HARQ response, without sending ACK.

[0119] Figure 14 This diagram illustrates an example of a monitoring operation, which is a basic example of the system's operation in this embodiment. Here, as an example, an example of a monitoring operation in LTE is shown. In the case where partial sensing is not configured by higher layers in the LTE sidelink, such as... Figure 14 As shown, terminal 20 selects resources for transmission. Figure 14 As shown, terminal 20 performs monitoring within a monitoring window of the resource pool. Through monitoring, terminal 20 receives the resource reservation field contained in the SCI sent from other terminals 20, and identifies usable resource candidates within the resource selection window of the resource pool based on this field. Then, terminal 20 randomly selects a resource from the usable resource candidates. Monitoring all resources within the monitoring window can be referred to as full sensing.

[0120] In addition, such as Figure 14 As shown, the resource pool can be configured with a period. For example, the period could be a duration of 10240 milliseconds. Figure 14 It is subframe t0 SL To subframe t Tmax SL An example of something being set up as a resource pool. The area of ​​the resource pool within a period can be set, for example, using a bitmap.

[0121] In addition, such as Figure 14 As shown, assuming the transmission trigger in terminal 20 occurs in subframe n, the priority of this transmission is p. TX Terminal 20 is able to detect in subframe t n-10×Pstep SL To subframe t n-1 SL In the monitoring window, for example, other terminals 20 are performing priority p RXThe transmission is processed. If an SCI is detected within the monitoring window and the RSRP is greater than a threshold, the resources within the resource selection window corresponding to that SCI are excluded. Conversely, if an SCI is detected within the monitoring window and the RSRP is less than a threshold, the resources within the resource selection window corresponding to that SCI are not excluded. This threshold can, for example, be based on priority p. TX and priority p RX The threshold Th is set or defined according to each resource within the monitoring window. pTX,pRX .

[0122] In addition, such as Figure 14 The subframe t shown Z SL In this way, for example, in order to send, resources in the resource selection window corresponding to resources in the unmonitored monitoring window are excluded.

[0123] like Figure 14 As shown, in the resource selection window from subframe n+T1 to subframe n+T2, resources occupied by other UEs are identified, and the resources excluded from this selection become the set of available resource candidates. Let S be the set of available resource candidates. A At that time, in S A If the number of resources is less than 20% of the resource selection window, then the threshold Th set for each resource in the monitoring window is applied. pTX,pRX The resource identification is performed again after the value increases by 3dB.

[0124] That is, by making the threshold Th pTX,pRX The resource identification process is repeated to increase the number of resources that were not excluded due to RSRP being less than the threshold. Furthermore, S is measured. A The RSSI of each resource is calculated, and the resource with the smallest RSSI is added to set S. B Repeat the process of making S A The RSSI included is the minimum resource added to S. B The action continues until the set of resource candidates S is reached. B It accounts for more than 20% of the resource selection window.

[0125] The lower layer of terminal 20 will S B Report to higher management. The higher management of Terminal 20 reported to S. B The resources to be used are determined through random selection. Terminal 20 uses the determined resources to perform sidelink transmissions. Alternatively, after temporarily securing resources, terminal 20 may not transmit at a predetermined number of times (e.g., C). resel Resources are used periodically for monitoring (once).

[0126] Figure 15This diagram illustrates an example of partial monitoring actions. In the LTE sidelink, partial monitoring is configured by higher layers, such as... Figure 15 As shown, terminal 20 selects resources for transmission. Figure 15 As shown, terminal 20 performs partial monitoring on a portion of the monitoring window within the resource pool. Through partial monitoring, terminal 20 receives the resource reservation field contained in the SCI sent from other terminals 20, and identifies usable resource candidates within the resource selection window of the resource pool based on this field. Then, terminal 20 randomly selects a resource from the usable resource candidates.

[0127] In addition, such as Figure 15 As shown, the resource pool can be configured with a period. For example, the period could be a duration of 10240 milliseconds. Figure 15 It is subframe t0 SL To subframe t Tmax SL An example of something being set up as a resource pool. The area of ​​the resource pool within a period can be set, for example, using a bitmap.

[0128] like Figure 15 As shown, assuming the transmission trigger in terminal 20 occurs in subframe n, the priority of this transmission is p. TX .exist Figure 15 In the example, subframes n+T1 to n+T2, subframe t y SL To subframe t y+Y SL The Y-frame is set as the resource selection window. And, as... Figure 15 As shown, assuming the transmission trigger in terminal 20 occurs in subframe n, the priority of this transmission is p. TX .

[0129] Terminal 20 is able to detect in subframe t, which is the length of Y subframe y-k×Pstep SL To subframe t y+Y-k×Pstep SL In one or more monitoring windows, for example, other terminals 20 are performing priority p RX The transmission. k could be, for example, a 10-bit bitmap. In Figure 15 The example shown illustrates how the 3rd and 6th bits of bitmap k are set to "1" to indicate partial monitoring. That is, in... Figure 15 In the middle, subframe t y-6×Pstep SL To subframe t y+Y-6×Pstep SL and subframe t y-3×Pstep SL To subframe t y+Y-3×Pstep SLIt is set as the monitoring window. As mentioned above, the i-th bit of bitmap k corresponds to subframe t. y-i×Pstep SL To subframe t y+Y-i×Pstep SL The monitoring window.

[0130] If an SCI is detected within one or more of the aforementioned monitoring windows and the RSRP is greater than a threshold, the resource in the resource selection window corresponding to that SCI is excluded. Conversely, if an SCI is detected within a monitoring window and the RSRP is less than a threshold, the resource in the resource selection window corresponding to that SCI is not excluded. This threshold can, for example, be based on priority p. TX and priority p RX Thresholds Th set or defined for each resource within the monitoring window pTX,pRX .

[0131] In the resource selection window with a Y-subframe, terminal 20 identifies resources occupied by other UEs, and the resources excluded from this list become available resource candidates. Let S be the set of available resource candidates. A At that time, in S A If the number of resources is less than 20% of the resource selection window, then the threshold Th set for each resource in the monitoring window is applied. pTX,pRX Increase by 3dB and then perform resource identification again. That is, by increasing the threshold Th pTX,pRX The resource identification process is repeated to increase the number of resources that were not excluded due to RSRP being less than the threshold. Furthermore, S is measured. A The RSSI of each resource is calculated, and the resource with the smallest RSSI is added to set S. B Repeat the process of making S A The RSSI included is the minimum resource added to S. B The action continues until the set of resource candidates S is reached. B It accounts for more than 20% of the resource selection window.

[0132] The lower layer of terminal 20 will S B Report to higher management. Higher management at Terminal 20 can access S... B The resource to be used is determined through random selection. Terminal 20 can use the determined resource to perform sidelink transmission. Alternatively, after temporarily securing the resource, terminal 20 may not transmit at a predetermined number of times (e.g., C). resel Resources are used periodically for monitoring (once).

[0133] In the above Figure 14 and Figure 15The text describes the actions of the sending terminal 20, but the receiving terminal 20 detects data transmissions from other terminals 20 based on monitoring or partial monitoring results, and receives data from those other terminals 20.

[0134] The resource selection actions in NR (e.g., non-patent documents 2, 3) are essentially the same as those in LTE.

[0135] That is, TX-UE selects all resources from the resource pool and the resource selection window (let's call it M). total Originally M total =S A In the monitoring window, specific resources detected by monitoring will be transferred from S. A Excluded from the list. Specific resources refer to resources reserved by the SCI received by the TX-UE, resources with RSRP (Received Power Ratio) for that SCI exceeding a threshold, unmonitored resources, etc.

[0136] The amount of resources identified (S) A If the amount of resources is less than X% of the total amount of resources in the resource selection window of the resource pool, the threshold is increased by 3dB and the above process is repeated until the amount of resources becomes more than X%. X is, for example, 20. Additionally, a resource is, for example, a resource of "one time slot × (one or more sub-channels)". Furthermore, RSRP can be a value measured by DM-RS of the resource transmitted via PSCCH of SCI, or a value measured by DM-RS of the resource indicated (reserved) via PSSCH of SCI.

[0137] In TX-UE, the determined S A Reported to higher management, and within higher management, for example, randomly from S A Select the transmission resource. In NR, power saving can be implemented based on the monitoring described above.

[0138] On the other hand, in the side link of NR version 16, a pre-emption confirmation and re-evaluation function is adopted. In this embodiment, terminal 20 can perform pre-emption confirmation and re-evaluation. Pre-emption confirmation and re-evaluation are functions used to select resource allocation mode 2, which is the resource sent autonomously by terminal 20. However, in this embodiment, it can also be used in mode 1.

[0139] Figure 16 This is a flowchart used to illustrate an example of re-evaluation. Figure 17This diagram illustrates an example of re-evaluation. In step S501, terminal 20 performs monitoring within the monitoring window. Monitoring can be performed within a pre-defined timeframe when terminal 20 is in power-saving mode. Next, based on the monitoring results, terminal 20 identifies each resource within the resource selection window and determines the set S of candidate resources. A (S502). Next, terminal 20 selects from the resource candidate set S A Select the resource set (r_0, r_1, ...) (S503). This resource set can also be a pre-selected resource used for transmission from a higher level.

[0140] In step S504, terminal 20, for example, in Figure 17 The timing T(r_0)-T3 shown is used to re-identify each resource within the resource selection window based on the monitoring results, and determine the set S of candidate resources. A Next, in S A If resource r_i is not included in the resource set, terminal 20 will exclude r_i from the resource set (S505), update the resource set, and end the re-evaluation. At higher levels, resources are selected from the re-evaluated resource set.

[0141] exist Figure 17 In the example of re-evaluation shown, resource r_0 and resource r_1 are not included in S due to the results of the re-monitoring. A Therefore, it is excluded from the resource set. Thus, terminal 20 uses resource r_0 to perform the transmission.

[0142] Figure 18 This is a timing diagram illustrating an example of preemptive confirmation. Figure 17 In this process, "re-evaluation" is replaced with "preemption confirmation," and "r_0" and "r_1" are replaced with "r′_0" and "r′_1," indicating the action. In step S601, terminal 20 performs monitoring in the monitoring window. When terminal 20 is performing power-saving actions, monitoring can be performed within a pre-defined timeframe. Next, based on the monitoring results, terminal 20 identifies each resource in the resource selection window and determines the set S of candidate resources. A (S602). Next, terminal 20 selects from the resource candidate set S A Select the resource set (r′_0, r′_1, ...) (S603). This resource set can also be a pre-selected resource chosen at a higher level for transmission.

[0143] In step S604, terminal 20 in Figure 17 The timing T(r_0)-T3 shown is used to re-identify each resource within the resource selection window based on the monitoring results and priority, thereby determining the set S of resource candidates. A .For example, Figure 17The r′_1 shown is included in set S through further monitoring. A middle.

[0144] If the preemption confirmation is valid, and the value prio_RX, which indicates the priority of an SCI sent from another terminal 20, is lower than the value prio_TX, which indicates the priority of a transport block sent from this terminal, then terminal 20 can take control of the SCI. A Resource r′_1 is excluded. Furthermore, if the value representing priority is lower, the priority becomes higher. That is, if the value prio_RX, representing the priority of an SCI sent from another terminal 20, is higher than the value prio_TX, representing the priority of a transport block sent from this terminal, terminal 20 will not send an SCI from another terminal 20. A Exclude resource r′_1.

[0145] The following discussion of priorities assumes that "high" means high priority.

[0146] In step S605, in S A If resource r′_i is not included in the resource set, terminal 20 excludes r′_i from the resource set (S605) and updates the resource set S. A In this case, based on the higher-level parameters and prio_TX and prio_RX, it is determined that r′_i cannot be used, and the preemption confirmation ends. Terminal 20 starts from the updated S A Select the resource to send.

[0147] (Mode 1)

[0148] The technologies described in this embodiment are not limited to specific wireless methods and modes such as NR and LTE, but as an example, we envision NR mode 1 (resource allocation mode 1), and therefore, the outline of mode 1 will be described here.

[0149] For reference Figure 2 As explained, in Mode 1, transmission resources for SL are allocated from base station 10 to terminal 20. That is, as... Figure 19 As shown, the terminal 20 is allocated transmission resources (i.e., PSCCH) for SL by means of the PDCCH (specifically DCI) received from the base station 10, and the terminal 20 uses the resources to transmit SL.

[0150] More specifically, in the allocation of SL transmission from base station 10 to terminal 20, there are three types: Dynamic Grant (DG), Configured Grant (CG), and CG Type 1. In Mode 1, DCI format 3_0 is used for both DG and CG Type 2. Furthermore, the monitoring timing for DCI format 3_0 is set separately from the other formats.

[0151] Figure 20 This shows an example of a field in DCI format 3_0. For example... Figure 20 As shown, the information notified by DCI format 3_0 includes information about the scheduled resources, information related to initial transmission / retransmission, and information related to feedback. Regarding the information related to initial transmission / retransmission, the transmitting terminal 20A manages the relationship between the HPN (HARQ Process Number) specified by DCI format 3_0 and the HPN in the SCI.

[0152] In addition, regarding feedback, please refer to... Figure 12 As explained above. Figure 21 In, it is shown Figure 12 The resources described herein. For example... Figure 21 As shown, it can send HARQ-ACK to base station 10 via PUCCH and back to terminal 20A via PSFCH.

[0153] (Regarding the research topic)

[0154] It is conceivable that SL services are provided by multiple different telecommunications operators in the same region. Hereinafter, telecommunications operators will be referred to as "operators".

[0155] That is, it is conceivable that multiple terminals 20 belonging to different operators exist within the signal range of each other. In such an environment, when multiple terminals 20 perform SL communication, SL transmissions that are beyond the control of any one operator may occur. For example, an SL signal transmitted by terminal 20A belonging to operator A using resources scheduled from base station 10A may interfere with terminal 20B of operator B, which is receiving the signal.

[0156] Hereinafter, embodiments 1 to 5 will be described as specific technical examples for solving the above-mentioned problems. Embodiments 1 to 5 can be implemented in any combination. Furthermore, in embodiments 1 to 5, it is assumed that synchronization is achieved in communication systems among multiple operators.

[0157] (Example 1)

[0158] Basic Movements

[0159] First, let's describe Example 1. In Example 1, the terminal 20 scheduled to send SL determines whether it can perform the scheduled SL transmission or the available transmission resources based on signals received from other terminals 20.

[0160] That is, a terminal 20 of a certain operator that is scheduled to transmit SL avoids signal conflicts with other operators' terminals 20 based on information obtained using SL signals received from other operators' terminals 20. Basically, in Embodiment 1, the terminal 20 of a certain operator that is scheduled to transmit SL avoids conflicts by monitoring SL signals transmitted from other operators' terminals 20, similar to the monitoring in Mode 2 described above.

[0161] refer to Figure 22 Provide a specific example. For example... Figure 22 As shown, assume there is 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.

[0162] The SL transmission of terminal 20-1 is scheduled through scheduling #1 from base station 10-1, and the SL transmission of terminal 20-2 is scheduled through scheduling #2 from base station 10-2.

[0163] Terminal 20-2 sends an SL signal based on schedule #2, and terminal 20-1 receives the SL signal. Based on the SL signal received from terminal 20-2, terminal 20-1 determines whether the resources allocated through schedule #1 can be utilized.

[0164] For example, terminal 20-1 receives SCI as SL signal from terminal 20-2, and determines that it is reserved based on this SCI. Figure 23 In this context, A represents the resource. On the other hand, through scheduling #1, terminal 20-1 is allocated the resource represented by B as the SL transmission resource.

[0165] When terminal 20-1 detects a conflict between the reserved resources of terminal 20-2 and the resource B allocated to it, it determines that resource B is unusable, and for example, does not transmit SL signals using resource B. This avoids interference to more than one terminal 20 of operator 2.

[0166] In the example above, terminal 20-1 determines whether it can utilize the resources allocated to it based on the resource reservation information received from terminal 20-2, but this is only one example. Terminal 20-1 can also determine whether it can utilize the resources allocated to it based on either or both of the information indicated by the time resource assignment field and the resource reservation period field in the SCI received from terminal 20-2.

[0167] Furthermore, terminal 20-1 can also determine whether it can utilize the resources allocated from base station 10-1 based on the received power of the SL signal received from terminal 20-2. For example, if the received power of the SL signal for a certain resource received from terminal 20-2 is above a threshold and part or all of that resource overlaps with part or all of the resources allocated from base station 10-1, terminal 20-1 can determine that the resource cannot be utilized.

[0168] In addition, when determining whether the resources allocated from base station 10-1 can be used, terminal 20-1 can also treat the resources allocated from base station 10-1 as the resources it selected in mode 2 and perform the same actions as the above-mentioned re-evaluation or pre-emption.

[0169] <Using resources to select actions>

[0170] In the example above, terminal 20-1 determines whether it can utilize the resources allocated by base station 10-1 based on the SL signal received from other terminals 20. However, as a more detailed action, the resource utilization selection action described below can also be performed.

[0171] In the resource selection process, base station 10-1 allocates multiple resources to terminal 20-1 as resources available for SL transmission. Terminal 20-1 selects available resources from the multiple resources based on the SL signal received from terminal 20-2, and uses the selected resources to perform SL transmission.

[0172] For example, suppose four resources A, B, C, and D are allocated from base station 10-1 to terminal 20-1 as resources that can be used for SL transmission. When terminal 20-1 determines from the SL signal received from terminal 20-2 that terminal 20-2 is using (including reserved) resources A and B, it uses either or both of resources C and D to perform SL transmission.

[0173] The multiple resources allocated from base station 10-1 can be allocated through multiple DCIs or through a single DCI. A single allocation can also include four or more resources.

[0174] In addition, multiple resources can also be treated as a set, with base station 10-1 indicating a specific set from the multiple sets to terminal 20-1.

[0175] For example, if base station 10-1 specifies a set 1 containing four resources A, B, C, and D as a set of usable resources to terminal 20-1, terminal 20-1 selects the resource to be used from the resources A, B, C, and D contained in set 1.

[0176] Furthermore, in the resource selection operation of allocating multiple resources from base station 10-1 to terminal 20-1, such as in Figure 12 As explained, terminal 20-1 can provide feedback to base station 10-1. In this case, terminal 20-1 can also determine the resource for feedback (e.g., time resource, frequency resource, or time-frequency resource) based on a specific resource (e.g., "last in time" or "first in time") among the multiple resources. The resource for feedback may not be based on the resource actually used in SL transmission.

[0177] For example, suppose terminal 20-1 receives the allocation of resources A, B, C, and D as multiple resources and performs SL transmission using resource A. Furthermore, suppose that resource D is the last resource among resources A, B, C, and D in terms of time, for example, terminal 20-1 sends feedback related to the SL transmission using resource A to base station 10-1 through a time slot that is a predetermined number of time slots later than the time slot of resource D.

[0178] <Reporting action to the base station>

[0179] Terminal 20-1 may also send NACK to base station 10-1 based on the signal received from terminal 20-2 without performing SL transmission using resources allocated from base station 10-1.

[0180] In addition, during the resource selection process described above, terminal 20-1 may also report to base station 10-1 any unused resources from the multiple resources allocated by base station 10-1 during SL transmission.

[0181] <About the Resource Group>

[0182] In Example 1, the resource group (e.g., the transmission resource pool) that can be used in SL transmission can also be shared among operators. Furthermore, the resource group that can be used in SL transmission can also be the same as the resource group (e.g., the reception resource pool) that should receive SL signals (i.e., should monitor SL signals).

[0183] Figure 24 Examples are shown. Figure 24 In the example shown, the transmit resource pool and the receive resource pool are the same, and the transmit resource pool and the receive resource pool are the same for both operator 1 and operator 2.

[0184] <Effects of Example 1>

[0185] It is conceivable that terminal 20 performing the actions of mode 1 also supports the actions of mode 2. In embodiment 1, terminal 20 avoids signal conflicts with terminals 20 of other operators by performing the same actions as in mode 2, namely monitoring and re-evaluation or pre-emption confirmation. Therefore, there is an effect that can suppress the installation of additional terminals and avoid conflicts between terminals operating in mode 1.

[0186] (Example 2)

[0187] Example 2 is based on Example 1 described above. In Example 2, a portion of the resource group (e.g., the receive resource pool) that should receive the SL signal (i.e., the SL signal that should be monitored) can also be a resource group (e.g., the transmit resource pool) that can be used in the transmission of the SL signal.

[0188] Figure 25 This shows an example of a transmit resource pool (TX resource pool) and a receive resource pool (RX resource pool). Figure 25 The example shown is hypothetical as follows: Figure 22 As shown, there exists a situation where base station 10-1 and terminal 20-1 belong to operator 1, and base station 10-2 and terminal 20-2 belong to operator 2.

[0189] like Figure 25 As shown, in this example, the receive resource pool is shared between operator 1 and operator 2. On the other hand, a portion of the receive resource pool (in...) Figure 25 In the example, the upper part) is the transmit resource pool of operator 1, and the other part of the receive resource pool (in... Figure 25 In the example, the lower half represents the transmission resource pool of operator 2. That is, the transmission resource pool is divided among operators.

[0190] Regarding the resource pool settings mentioned above, they can be predetermined in the specifications, and each operator's terminal 20 and base station 10 can operate according to the specifications. Alternatively, each operator can configure the terminal 20 from the base station 10 via RRC signals, MAC CE, or DCI.

[0191] like Figure 25 As shown, resource pooling conflicts between terminal 20-1 and terminal 20-2 can be avoided by setting up resource pools that divide transmission resource pools among operators.

[0192] <Effects of Example 2>

[0193] As described above, in Embodiment 2, conflicts in SL transmissions between terminals 20 belonging to one operator and terminals 20 belonging to other operators can be avoided through pre-setting. Therefore, it is possible to prevent SL transmission conflicts between terminals controlled by different operators.

[0194] (Example 3)

[0195] Next, Embodiment 3 will be described. Embodiment 3 is based on Embodiments 1 and 2. However, Embodiment 3 may also be based solely on Embodiment 1. Alternatively, it may be combined with other embodiments.

[0196] In embodiment 3, the SCI sent by terminal 20 may include information indicating the operator to which the base station 10, which performed the corresponding scheduling, belongs. The operator information may also be the operator's PLMN (Public Land Mobile Network) number.

[0197] Alternatively, for example, the PLMN and SCI field values ​​can be associated between the base station 10 and the terminal 20 at a higher layer. When the terminal 20 sends the SCI, it instructs the PLMN, which in turn indicates one of the field values.

[0198] For example, a terminal 20 of a certain operator may also perform the conflict avoidance action described in Example 1 only when it receives an SL signal from another operator (i.e., an SL signal containing information identifying the other operator).

[0199] (Example 4)

[0200] Next, Example 4 will be described. Example 4 can be implemented without being based on Examples 1 to 3, or it can be implemented in combination with any one, any multiple, or all of Examples 1 to 3.

[0201] In embodiment 4, terminal 20 receives information A related to SL from base station 10 and sends information B based on information A to other terminals 20. Furthermore, these other terminals 20 can also send information C based on information B to the base station 10 of their own operator.

[0202] As mentioned above, Figure 26 This illustrates an example of information flow using information A, B, and C. Figure 26 In the example, there are base station 10-1 and terminal 20-1 belonging to operator 1, and base station 10-2 and terminal 20-2 belonging to operator 2. Terminal 20-1 receives information A from base station 10-2 and sends information B based on information A to terminal 20-2. Terminal 20-2 sends information C based on information B to base station 10-2.

[0203] In addition, it is not necessary for terminal 20-1 to send information B based on information A received from base station 10-1 to terminal 20-2, and for terminal 20-2 to send information C based on information B to base station 10-2. Either one or both of these actions can be omitted.

[0204] In Example 4, through the above actions, a terminal 20 belonging to a certain operator avoids conflicts in SL transmission with a terminal 20 belonging to another operator, based on information from the base station 10 of that operator or information from other terminals 20.

[0205] The following is based on Figure 26 Taking the situation shown as an example, for information A, information B, and information C, we will explain examples related to the actions involved in sending the information and the content of the information.

[0206] <About Information A>

[0207] exist Figure 26 In this context, the signal containing information A sent from base station 10-1 to terminal 20-1 can be UE-specific DCI, group-common DCI, or higher-layer signaling (e.g., MAC CE, RRC signals).

[0208] Information A sent from base station 10-1 to terminal 20-1 can also be information related to the resources sent by SL, which is the result of base station 10-1 scheduling one or more terminals under its control (e.g., all terminals under its control). That is, for example, if there are terminals 1, 2, and 3 under the control of base station 10-1, information A can include resource information sent by SL that is scheduled for terminal 1, resource information sent by SL that is scheduled for terminal 2, and resource information sent by SL that is scheduled for terminal 3.

[0209] Furthermore, information A can also be a base station of an operator other than operator 1 to which the base station 10-1 that sends information A belongs (in... Figure 26 In the example, base station 10-2) schedules information related to the resources sent by SL for one or more terminals under the control of the base station (e.g., all terminals under its control).

[0210] Furthermore, in any of the above situations, the information A sent from base station 10-1 to terminal 20-1 may include scheduling information sent by SL to terminal 20-1.

[0211] If a portion or all of the resources allocated to it by base station 10-1 for SL transmission overlaps with a portion or all of the resources represented by information A (e.g., SL transmission resources in other operators), terminal 20-1 may perform a predetermined action.

[0212] The predetermined action of terminal 20-1 is, for example, to stop the SL transmission that is using the resources allocated to it. In this case, terminal 20-1 may also send a NACK to base station 10-1.

[0213] Furthermore, the predetermined action of terminal 20-1 may also be to increase the transmission power and perform SL transmission utilizing the resources allocated to itself. Alternatively, the predetermined action of terminal 20-1 may be to perform SL transmission utilizing the resources allocated to itself as usual.

[0214] Which of the above actions (stop transmission, increase transmission power, normal transmission) to perform can be determined based on at least one of the following: the priority of the allocated resource, the order in which the resources are allocated, and whether the resource can be reserved. For example, assuming the priority of the allocated resource is high, medium, or low, if priority = high, then increase transmission power; if priority = medium, then normal transmission; and if priority = low, then stop transmission.

[0215] <About Information B>

[0216] Terminal 20-1 can either guarantee the transmission of information B upon receiving information A, or it can determine whether predetermined conditions are met and only transmit information B if the predetermined conditions are met. Predetermined conditions may include, for example, the expected transmission time (e.g., a time slot or time window).

[0217] As an example, if terminal 20-1 anticipates sending SL from the moment it receives information A (e.g., time slot k) until a time n time slots later (i.e., time slot k+n), it may send information B at a scheduled time during that SL transmission. "Anticipating SL transmission" means, for example, anticipating scheduling SL transmission for terminal 20-1 or sending SL transmission using resources autonomously selected by terminal 20-1.

[0218] Terminal 20-1 can send information B using dedicated resources or resources that are pre-configured as independent resources between operators. For example, suppose operator 1 has resource B1 configured for terminal 20-1 to send information B, and operator 2 has resource B2 configured for terminal 20-2 to send information B. In this case, terminal 20-1 uses resource B1 to send information B.

[0219] Terminal 20-1 can also unconditionally send information B after being allocated resources for sending information B. Furthermore, a predetermined (e.g., highest) priority can be allocated to the resources used for sending information B, and terminal 20-1 can send information B according to this priority.

[0220] The signal containing information B sent by terminal 20-1 can be sent through a data channel, a control channel, a feedback channel, or a dedicated channel other than these.

[0221] Furthermore, the signal containing information B sent by terminal 20-1 can also be an SCI. When using an SCI, the SCI format can be any format. Alternatively, a dedicated SCI format containing information B can also be used as the SCI format.

[0222] Furthermore, a signal containing information B sent by terminal 20-1 can be transmitted via higher-layer signaling (e.g., MAC CE, RRC signals). Additionally, a signal containing information B sent by terminal 20-1 can also be transmitted via any of the following methods: broadcast, groupcast, or unicast.

[0223] The information B sent by terminal 20-1 may be, for example, information about resources that a terminal 20 other than the operator 1 to which terminal 20-1 belongs cannot utilize in SL transmission. This information about resources that cannot be utilized in SL transmission may be information about predetermined resources that a terminal 20 other than terminal 20 can utilize, for the terminal 20 receiving information B.

[0224] For example, when base station 10-1 sends information about the resources used for SL transmission that have been scheduled by one or more terminals 20 under the control of operator 1 to terminal 20-1 as information A, terminal 20-1 may also send information A as information B (that is, information about resources that cannot be used in SL transmission for terminals 20 of other operators).

[0225] If a terminal 20-2 receiving information B has some or all of the resources allocated to it by base station 10-2 for SL transmission that are duplicated by some or all of the resources represented by information B (e.g., SL transmission resources in other operators), it may perform a predetermined action.

[0226] The predetermined action of terminal 20-2 is, for example, to stop the SL transmission that is utilizing the resources allocated to it. In this case, terminal 20-2 may also send a NACK to base station 10-2.

[0227] Furthermore, the predetermined action of terminal 20-2 may also be to increase the transmission power and perform SL transmission utilizing the resources allocated to itself. Alternatively, the predetermined action of terminal 20-2 may be to perform SL transmission utilizing the resources allocated to itself as usual.

[0228] Which of the above actions (stop transmission, increase transmission power, normal transmission) to perform can be determined based on at least one of the following: the priority of the allocated resource, the allocation order of the resources, and whether the resource can be reserved. For example, assuming the priority of the allocated resource is high, medium, or low, if priority = high, then increase transmission power; if priority = medium, then normal transmission; and if priority = low, then stop transmission. Alternatively, the above can also be performed based on at least one of the following: priority, allocation order, and whether the resource can be reserved.

[0229] <About Information C>

[0230] exist Figure 26 In this system, terminal 20-2 may send information C to base station 10-2 after receiving information B, or it may send information C to base station 10-2 only when predetermined conditions are met. The predetermined condition may be "receiving information B".

[0231] In addition, the pre-determined conditions could be, for example, that UL transmission is expected to take place at a predetermined time (e.g., a time slot or time window).

[0232] As an example, if terminal 20-2 is expected to perform UL transmission from the moment it receives information B (e.g., time slot k) to a time n time slots later (i.e., time slot k+n), for example, it may be to send information C at a scheduled time during the UL transmission. "Expected to perform UL transmission" could also mean that terminal 20-2 has scheduled UL transmission or expects to perform UL transmission using resources autonomously selected by terminal 20-2.

[0233] Terminal 20-2 can also send information C through periodic resources. In addition, non-periodic resources can be scheduled from base station 10-2 to terminal 20-2, and terminal 20-2 sends information C through these non-periodic resources.

[0234] The signal containing the information C sent by terminal 20-2 can be sent through a data channel, a control channel, a feedback channel, or a dedicated channel.

[0235] Furthermore, the signal containing information C transmitted by terminal 20-2 can also be UCI. When using UCI, the format of the UCI can be any format. Alternatively, a UCI-specific format containing information C can also be used as the UCI format.

[0236] In addition, signals containing information C sent by terminal 20-2 can be sent via higher-layer signaling (e.g., MAC CE, RRC signals).

[0237] The following are specific examples of actions related to the information A, B, and C mentioned above, with reference to the accompanying drawings, to illustrate Examples 4-1 to 4-3.

[0238] <Example 4-1>

[0239] Figure 27 This is a diagram used to illustrate embodiment 4-1. In S11, terminal 20-1 of operator 1 receives information A from base station 10-1 regarding resources allocated in operator 2 for transmission of SL to one or more terminals 20.

[0240] Furthermore, in S12, terminal 20-1 receives information about the resources used for SL transmission sent to itself. In S13, terminal 20-1 compares the information about the resources allocated by operator 2 shown in information A received in S11 with the information about the resources sent to itself received in S12, thereby performing transmission control such as determining whether SL transmission using the allocated resources in S12 can be implemented. Specifically, as described above, for example, transmission can be stopped, transmission can be increased with transmission power, or normal transmission can be performed.

[0241] <Example 4-2>

[0242] Figure 28 This is a diagram used to illustrate embodiment 4-2. In S22, terminal 20-1 of operator 1 receives information A from base station 10-1 regarding resources allocated in operator 1 to more than one terminal 20 for SL transmission.

[0243] In S22, terminal 20-1 sends the information received as information A to terminal 20-2 as information B.

[0244] Furthermore, in S23, terminal 20-2 receives information about the resources used for SL transmission sent to itself. In S24, terminal 20-2 compares the information about the resources allocated by operator 1 shown in information B received in S22 with the information about the resources sent to itself received in S23, thereby performing transmission control such as determining whether SL transmission using the allocated resources in S23 can be implemented. Specifically, as described above, for example, transmission stoppage, transmission with increased transmission power, or normal transmission may be performed.

[0245] <Example 4-3>

[0246] Figure 29 This is a diagram used to illustrate embodiments 4-3. In S31, terminal 20-1 of operator 1 receives information A from base station 10-1 regarding resources allocated in operator 1 to more than one terminal 20 for SL transmission.

[0247] In S32, terminal 20-1 sends the information received as information A to terminal 20-2 as information B. In S33, terminal 20-2 sends the information received as information B to base station 10-2 as information C.

[0248] In embodiment 4-3, in addition to terminal 20-2, terminal 21-2 is also shown as a terminal of operator 2. In S34, terminal 21-2 receives information from base station 10-2 about resources allocated in operator 1 for SL transmission to one or more terminals 20, as information A.

[0249] Furthermore, in S35, terminal 21-2 receives information about the resources used for SL transmission sent to itself. In S36, terminal 21-2 compares the information about the resources allocated by operator 1 shown in information A received in S34 with the information about the resources sent to itself received in S35, thereby performing transmission control such as determining whether SL transmission using the allocated resources in S35 can be implemented. Specifically, as described above, for example, transmission stoppage, transmission with increased transmission power, or normal transmission may be performed.

[0250] Furthermore, in the example above, base station 10-2 can implement the scheduling in S35 based on information C to avoid resource conflicts with operator 1. That is, base station 10-2 can also determine the allocation information of the resources used for SL transmission by terminal 21-2 based on information C, and send the allocation information of those resources to terminal 21-2 to avoid resource conflicts with operator 1.

[0251] <Effect of Example 4>

[0252] In Example 4, for example, each operator's base station 10 can learn about the SL allocation status of other operators. The method by which base station 10 learns about the SL allocation status of other operators can be based on reports from terminal 20, or it can be learned by sending and receiving information between base stations.

[0253] Therefore, base station 10 can schedule the terminals 20 under its control in a manner that avoids transmission conflicts with terminals 20 of other operators. Furthermore, according to embodiment 4, terminal 20 can learn about the SL allocation status of other operators and perform transmission conflict avoidance actions accordingly.

[0254] (Example 5)

[0255] Next, Example 5 will be described. Example 5 can be implemented without being based on Examples 1 to 4, or it can be implemented in combination with any one, any multiple, or all of Examples 1 to 4.

[0256] In embodiment 5, the terminal 20 that performs SL transmission is connected to 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 its own operator, but also to the base stations 10 of other operators. As a result, a terminal 20 of a certain operator can avoid SL transmission conflicts with terminals 20 of other operators by using information obtained from signals from each operator.

[0257] Furthermore, in Embodiment 5, "terminal 20 connects to base station 10" includes not only establishing a connection via RRC, but also "terminal 20 receives signals from base station 10 without establishing a connection via RRC, etc." Additionally, in Embodiment 5, the terminal 20 can be configured to use resource groups (e.g., resource pool, CC, serving cell) that are only accessible to terminals 20 connected to base stations 10 of multiple operators.

[0258] The following provides more specific examples based on the perspectives of connection methods with base stations of multiple operators, scheduling methods, methods for receiving scheduling information from multiple base stations, and transmission control.

[0259] <Examples of connection methods and transmission control with base stations of multiple operators>

[0260] Here, with Figure 22 , Figure 26 Similarly, consider a scenario where operator 1, from the perspective of terminal 20-1, can send its own scheduling information, and operator 2 only sends resource allocation information for terminal 20-2, which is another terminal 20. More specifically, base station 10-1 sends the scheduling information of operator 1, and base station 10-2 sends the scheduling information of operator 2.

[0261] refer to Figure 30 Here's an example of the connection method in this scenario. In S41, an RRC connection is established between terminal 20-1 and base station 10-1. On the other hand, no RRC connection is established between terminal 20-1 and base station 10-2. In S42, terminal 20-1 receives SSB and system information sent from base station 10-2. This SSB or system information may contain information about resources used to receive information (e.g., DCI) sent from base station 10-2 in S44, which will be described later.

[0262] In S43, terminal 20-1 receives information about scheduling-related resources (scheduling information from operator 1) destined for itself from base station 10-1. In S44, terminal 20-1 receives information about scheduling-related resources for SL transmission from operator 2 from base station 10-2 (e.g., scheduling information from operator 2 for SL transmission for more than one terminal 20).

[0263] In S45, terminal 20-1 performs transmission control. Specifically, if some or all of the resources allocated to it by base station 10-1 for SL transmission overlap with some or all of the resources received in S44 (e.g., SL transmission resources from other operators), terminal 20-1 may perform a predetermined action.

[0264] The predetermined action of terminal 20-1 is, for example, to stop the SL transmission that is using the resources allocated to it. In this case, terminal 20-1 may also send a NACK to base station 10-1.

[0265] Furthermore, the predetermined action of terminal 20-1 may also be to increase the transmission power and perform SL transmission utilizing the resources allocated to itself. Alternatively, the predetermined action of terminal 20-1 may be to perform SL transmission utilizing the resources allocated to itself as usual.

[0266] Which of the above actions (stop transmission, increase transmission power, normal transmission) to perform can be determined based on at least one of the following: the priority of the allocated resource, the order in which the resources are allocated, and whether the resource can be reserved. For example, the priority of the allocated resource can be categorized as high, medium, or low. If priority = high, then increase transmission power; if priority = medium, then perform normal transmission; and if priority = low, then stop transmission.

[0267] refer to Figure 31 To illustrate another example, in S51, an RRC connection is established between terminal 20-1 and base station 10-1.

[0268] On the other hand, terminal 20-1 receives SSB from base station 10-2 in S52 and performs PRACH transmission in S53. The PRACH resources (e.g., sequences) used in this PRACH transmission may also be different from the PRACH resources used in the PRACH transmission for RRC connection.

[0269] After the PRACH is transmitted, in S54, terminal 20-1 receives from base station 10-2 configuration information related to PDCCH reception used by operator 2 in 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 PDCCH reception.

[0270] In S55, terminal 20-1 receives information about scheduling-related resources (scheduling information from operator 1) destined for itself from base station 10-1. In S56, terminal 20-1 receives information about scheduling-related resources for SL transmission from operator 2 from base station 10-2 (e.g., scheduling information from operator 2 for SL transmission for more than one terminal 20).

[0271] In S57, terminal 20-1 performs transmission control. Here, as described above, for example, terminal 20-1 may also perform a predetermined action if part or all of the resources allocated to it by base station 10-1 for SL transmission overlap with part or all of the resources received in S56 (e.g., SL transmission resources from other operators). Examples of predetermined actions are described above.

[0272] <Scheduling Methods>

[0273] In embodiment 5, the scheduling of SL transmission resources (SL resources) from base station 10 to terminal 20 can be performed by sending a signal to a single terminal 20 (e.g., UE-specific signal) or by sending a signal to multiple terminals 20 (e.g., group-common signal).

[0274] The signals transmitted to the multiple terminals 20 may include information about the SL resources allocated to each terminal 20. Furthermore, the signals transmitted to the multiple terminals 20 may also include information related to feedback to the base station 10 (e.g., PUCCH slots, PUCCH resources, SAI, DAI, etc.). Additionally, the signals transmitted to the multiple terminals 20 may include both information about the SL resources allocated to each terminal 20 and information related to feedback to the base station 10.

[0275] As described above, when the signal sent to multiple terminals 20 contains scheduling information (such as information on SL resources) allocated to each terminal 20, the terminal 20 can determine the scheduling information sent to itself based on at least one of the following (1) to (3).

[0276] (1) The RNTI scrambled by the CRC of the DCI is used to determine the destination. For example, if the terminal 20 has already decoded the DCI using a specific RNTI, it will determine that the DCI is destined for itself.

[0277] (2) Terminal 20 determines the Xth scheduling information among the N (N≥0) scheduling information contained in the signal sent to multiple terminals 20 as the scheduling information sent to itself. Here, X can be specified to terminal 20 by base station 10, for example, through RRC signal or MAC CE and other higher-layer parameters.

[0278] (3) The UE-ID contained in the signal sent to multiple terminals 20 is used to determine the UE-ID. For example, if the signal sent to multiple terminals 20 contains its own UE-ID, the terminal 20 determines that the scheduling information of the signal is sent to itself.

[0279] In signals sent to multiple terminals 20, predetermined parameters can be shared among the multiple terminals 20. Here, predetermined parameters include, for example, MCS (Multi-Session Control), time-domain resources, etc.

[0280] <Method for receiving scheduling information from multiple base stations>

[0281] refer to Figure 32 , Figure 33 This example illustrates a scenario where terminal 20 receives scheduling information from multiple base stations 10. Similar to the previous example, base station 10-1 and terminal 20-1 belong to operator 1, while base station 10-2 and terminal 20-2 belong to operator 2.

[0282] exist Figure 32 In the example, terminal 20-1 receives scheduling information destined for itself from base station 10-1 via UE-specific DCI. Furthermore, terminal 20-1, for example, via... Figure 30 or Figure 31 The method described herein is used to receive scheduling information sent by SL in operator 2.

[0283] exist Figure 33 In the example, terminal 20-1 receives group-shared scheduling information from base station 10-1 via Group Common DCI. Furthermore, terminal 20-1, for example, via... Figure 30 or Figure 31 The method described herein receives scheduling information sent by the SL in operator 2. Here, an example is shown of scheduling information for terminal 20 under the control of operator 2 being sent from base station 10-2 of operator 2 via group common DCI.

[0284] exist Figure 32 , Figure 33 In any of the examples, for instance, if terminal 20-1 also performs the aforementioned predetermined action when some or all of the resources allocated to it by base station 10-1 for SL transmission overlap with some or all of the SL transmission resources in operator 2.

[0285] In addition, terminal 20 can also receive multiple DCIs related to different RNTIs from base stations 10 of various operators. At this time, terminal 20 can determine that all scheduling information except for the scheduling information sent to itself is scheduling information sent to another terminal 20 and cannot use the scheduling information.

[0286] This section provides an example illustrating the scenario where base station 10-1 and terminal 20-1 belong to operator 1, and base station 10-2 and terminal 20-2 belong to operator 2.

[0287] For example, in operator 1, base station 10-1 transmits multiple DCIs with multiple RNTI values ​​that should be received by multiple terminals 20 under the control of operator 1. For example, base station 10-1 transmits a DCI with RNTI-A that should be received by terminal 20-1 and a DCI with RNTI-B that should be received by terminal 21-1, which is another terminal. Furthermore, while an example using multiple RNTIs is shown here, a single RNTI can also be set, allowing the identification of scheduling information sent to itself in addition to the RNTI.

[0288] Similarly, in operator 2, base station 10-2 transmits multiple DCIs with multiple RNTI values ​​that should be received by multiple terminals 20 under the control of operator 2. In this case, terminal 20-1 of operator 1 determines that all DCIs received from base station 10-2 correspond to scheduling information sent to other terminals 20.

[0289] <Sample of Reception>

[0290] It can also be envisioned that terminal 20 receives signals destined for multiple terminals 20 from each operator during the PDCCH monitoring occasion. For example, in Figure 33 In the example, it can also be imagined that when terminal 20-1 is monitored by the PDCCH of each operator, it must receive the Group common DCI from base station 10-1 and base station 10-2 respectively as a signal to be sent to multiple terminals 20.

[0291] Terminal 20 may determine that it will not perform SL transmission through the SL resources corresponding to the corresponding time if it fails to receive a signal destined for multiple terminals 20 from at least one of the multiple operators anticipated to be received during the corresponding PDCCH monitoring time. Furthermore, if SL resources corresponding to the time are allocated, transmission in those SL resources may be stopped. This is because it is conceivable that the reception quality of the SL signal will deteriorate during that time.

[0292] Furthermore, this could mean that if a predetermined set of parameters is notified to the terminal 20 from base station 10 of any operator, no SL resource allocation will be performed on the terminal 20. Additionally, the terminal 20 can also receive SL scheduling messages destined for it from base stations 10 of multiple operators. Furthermore, the terminal 20-1 can also report the scheduling information received from base station 10-1 to base station 10-2.

[0293] <Effects of Example 5>

[0294] According to Embodiment 5, terminal 20 can perform actions to avoid transmission conflicts based on the scheduling status of each operator.

[0295] (Other examples)

[0296] For any one of Embodiments 1 to 5, the base station 10 can be replaced with a terminal 20 different from the terminal 20 controlled by the base station 10, and Embodiments 1 to 5 can be implemented. That is, for any one of Embodiments 1 to 5, the technology of the embodiments can also be applied to the action of setting (or allocating) transmission resources of another terminal 20 by a certain terminal 20.

[0297] For any one of Embodiments 1 to 5, Terminal 20 can be any terminal, a V2X terminal, or a terminal other than a V2X terminal that performs D2D.

[0298] Furthermore, for any of Embodiments 1 to 5, this action may also be performed only in a specific resource pool. For example, for any of Embodiments 1 to 5, this action may also be performed only in a resource pool that can be used by terminal 20 after Rel-17.

[0299] (Device Structure)

[0300] Next, an example of the functional structure of the base station 10 and the terminal 20 performing the processes and actions described above will be explained. The base station 10 and the terminal 20 include the functions of embodiments 1 to 5 described above. However, the base station 10 and the terminal 20 may each have only the functions of any one of embodiments 1 to 5.

[0301] <Base Station 10>

[0302] Figure 34 This is a diagram illustrating an example of the functional structure of base station 10. (As shown...) Figure 34 As shown, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130 and a control unit 140. Figure 34 The functional structure shown is only one example. The functional distinctions and names of the functional units can be arbitrary, as long as the actions involved in the embodiments of the present invention can be performed. The transmitting unit 110 and the receiving unit 120 can also be referred to as communication units.

[0303] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-level information from the received signals. In addition, the transmitting unit 110 has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20.

[0304] The setting unit 130 stores preset setting information and various setting information sent to the terminal 20 into a storage device, and reads it from the storage device as needed. The setting information is read from the setting unit 130 and sent to the terminal 20 by the sending unit 110.

[0305] The control unit 140 performs functions such as resource allocation and overall control of the base station 10. Alternatively, the signal transmission-related functions of the control unit 140 can be included in the transmitting unit 110, and the signal reception-related functions of the control unit 140 can be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 can be referred to as a transmitter and a receiver, respectively.

[0306] Terminal 20

[0307] Figure 35 This is a diagram illustrating an example of the functional structure of terminal 20. (As shown...) Figure 35 As shown, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. Figure 35 The functional structure shown is only one example. The functional distinctions and names of the functional units can be arbitrary, as long as the actions involved in the embodiments of the present invention can be performed. The transmitting unit 210 and the receiving unit 220 can also be referred to as communication units.

[0308] The transmitting unit 210 generates a transmission signal based on the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains higher-level signals from the received physical layer signals.

[0309] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 into a storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores pre-set setting information. The control unit 240 performs controls such as determining whether SL transmission using allocated resources is permissible.

[0310] Alternatively, the signal transmission-related functional units in the control unit 240 can be included in the transmitting unit 210, and the signal reception-related functional units in the control unit 240 can be included in the receiving unit 220. Furthermore, the transmitting unit 210 and the receiving unit 220 can be referred to as a transmitter and a receiver, respectively.

[0311] According to this embodiment, at least one terminal, base station, and transmission method as described in the following examples are provided. Hereinafter, each associated embodiment will be described.

[0312] <Examples 1-3>

[0313] (Item 1)

[0314] A terminal having:

[0315] The receiving unit receives resource allocation information transmitted from the side link of the base station of the first operator;

[0316] The control unit determines, based on the sidelink signal received from the terminal of the second operator, whether to perform sidelink transmission using the resources; and

[0317] When the sending unit determines that it is performing a sidelink transmission using the resource, the sending unit performs a sidelink transmission using the resource.

[0318] (Item 2)

[0319] According to the terminal described in item 1, wherein,

[0320] Allocate multiple resources for sidelink transmission to the terminal.

[0321] The control unit selects usable resources from the plurality of resources based on the side link signal.

[0322] (Item 3)

[0323] According to the terminal described in item 2, wherein,

[0324] The control unit determines the resource for sending feedback to the base station based on a specific resource among the plurality of resources.

[0325] (Item 4)

[0326] The terminal described according to any one of items 1 to 3, wherein,

[0327] Without performing a sidelink transmission that uses resources allocated from the base station, the transmitting unit sends a NACK to the base station.

[0328] (Item 5)

[0329] The terminal described in any one of items 1 to 4, wherein,

[0330] In both the first and second operators, a portion of the resource pool for sidelink reception is a resource pool for sidelink transmission.

[0331] (Item 6)

[0332] A sending method, executed by a terminal, has the following steps:

[0333] Resource allocation information sent from the side link of the base station of the first operator;

[0334] Based on the sidelink signal received from the terminal of the second operator, determine whether a sidelink transmission using the resources has been performed; and

[0335] If it is determined that a sidelink transmission using the resource is to be performed, then the sidelink transmission using the resource is executed.

[0336] According to any one of items 1 through 6, a technique is provided that can avoid sidelink transmission conflicts between terminals of different operators. In particular, according to item 2, since a resource can be selected from multiple resources, flexible control is possible. According to item 3, the resource used for feedback (e.g., timing) can be clearly defined. According to item 4, the base station can monitor the conflict status. According to item 5, for example, conflicts can be avoided by dividing the resource pools for sidelink transmission among operators.

[0337] <Example 4>

[0338] (Item 1)

[0339] A terminal having:

[0340] The receiving unit receives resource allocation information transmitted from the side link of at least one of the first operator and the second operator from the base station of the first operator.

[0341] The control unit, based on the resource allocation information, determines whether to perform sidelink transmission using resources allocated from the base station; and

[0342] When the transmitting unit determines that it is necessary to perform the side link transmission, the transmitting unit performs the side link transmission.

[0343] (Item 2)

[0344] According to the terminal described in item 1, wherein,

[0345] The transmitting unit transmits the resource allocation information received from the base station via a side link.

[0346] (Item 3)

[0347] A terminal having:

[0348] The receiving unit receives resource allocation information sent by the side link of the first operator via the side link;

[0349] The control unit, based on the resource allocation information, determines whether to perform sidelink transmission; and

[0350] When the transmitting unit determines that it is necessary to perform the side link transmission, the transmitting unit performs the side link transmission.

[0351] (Item 4)

[0352] According to the terminal described in item 3, wherein...

[0353] The transmitting unit sends the resource allocation information to the base station of the second operator.

[0354] (Item 5)

[0355] A base station having:

[0356] The receiving unit receives resource allocation information sent by the side link in the first operator via the uplink;

[0357] The control unit, based on the resource allocation information, determines the resources used for sidelink transmission by the second operator's terminal; and

[0358] The transmitting unit sends resource allocation information determined by the control unit to the terminal of the second operator.

[0359] (Item 6)

[0360] A sending method, executed by a terminal, has the following steps:

[0361] Receive resource allocation information from the base station of the first operator via the side link of at least one of the first operator and the second operator;

[0362] Based on the resource allocation information, determine whether sidelink transmission using resources allocated from the base station has been performed; and

[0363] If it is determined that the sidelink transmission is to be performed, then the sidelink transmission is executed.

[0364] According to any one of items 1 to 6, a technique is provided that can avoid sidelink transmission conflicts between terminals of different operators. Specifically, according to item 2, the receiving side of the sidelink can obtain resource allocation information of other operators. According to item 4, the base station can obtain resource allocation information of other operators.

[0365] <Example 5>

[0366] (Item 1)

[0367] A terminal having:

[0368] The receiving unit receives resource allocation information, i.e., first resource allocation information, from the base station of the first operator and from the base station of the second operator, i.e., second resource allocation information, from the side link of the second operator.

[0369] The control unit, based on the second resource allocation information, determines whether to perform sidelink transmission using resources allocated by the first resource allocation information; and

[0370] When the transmitting unit determines that it is necessary to perform the side link transmission, the transmitting unit performs the side link transmission.

[0371] (Item 2)

[0372] According to the terminal described in item 1, wherein,

[0373] After the transmitting unit sends a PRACH to the base station of the second operator, the receiving unit receives setting information from the base station of the second operator for receiving the second resource allocation information.

[0374] (Item 3)

[0375] According to the terminal described in item 1 or item 2, wherein,

[0376] The receiving unit receives signals sent by the base station of the first operator to multiple terminals, and obtains the first resource allocation information from the signals.

[0377] (Item 4)

[0378] The terminal described according to any one of items 1 to 3, wherein,

[0379] The receiving unit is designed to receive signals destined for multiple terminals from the base stations of each operator during each PDCCH monitoring period. If no signals destined for multiple terminals are received during a certain PDCCH monitoring period, the transmitting unit will not perform sidelink transmission through the resources corresponding to that PDCCH monitoring period.

[0380] (Item 5)

[0381] A base station having:

[0382] The transmitting unit sends to the terminal the resource allocation information transmitted via the sidelink of the first operator, namely the first resource allocation information; and

[0383] The receiving unit, in a terminal that receives resource allocation information (i.e., second resource allocation information) transmitted via a sidelink from a base station of a second operator, receives NACK from the terminal if it is determined, based on the second resource allocation information, that sidelink transmission using resources allocated by the first resource allocation information will not be performed.

[0384] (Item 6)

[0385] A sending method, executed by a terminal, has the following steps:

[0386] The resource allocation information is received from the base station of the first operator, which is the first resource allocation information sent by the side link of the first operator; and the resource allocation information is received from the base station of the second operator, which is the second resource allocation information sent by the side link of the second operator.

[0387] Based on the second resource allocation information, determine whether a sidelink transmission using resources allocated by the first resource allocation information has been performed; and

[0388] If it is determined that the sidelink transmission is to be performed, then the sidelink transmission is executed.

[0389] According to any one of items 1 to 6, a technique is provided that can avoid sidelink transmission conflicts between terminals of different operators. In particular, according to item 2, configuration information can be received from base stations of other operators without establishing an RRC connection. According to item 3, information destined for itself can be obtained from signals transmitted to multiple terminals. According to item 4, SL transmission can be performed, for example, under conditions of good wireless quality.

[0390] (Hardware Structure)

[0391] The block diagram used in the description of the above embodiments ( Figure 34 and Figure 35The diagram illustrates blocks organized by function. These functional blocks (structural units) are implemented through any combination of at least one of hardware and software. Furthermore, there are no particular limitations on the implementation method of each functional block. That is, each functional block can be implemented using a single device that is physically or logically combined, or by directly or indirectly (e.g., using wired, wireless, etc.) connecting two or more physically or logically separate devices. Functional blocks can also be implemented by combining software with one or more of the aforementioned devices.

[0392] Functionally, it includes functions such as judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, receiving, sending, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning, but is not limited to these. For example, the functional block (structural part) that enables transmission is called the transmitting unit or transmitter. In short, as mentioned above, there are no particular limitations on the implementation method.

[0393] For example, in one embodiment of this disclosure, the base station 10, terminal 20, etc., can also function as a computer for processing the wireless communication method of this disclosure. Figure 36 This is a diagram illustrating an example of the hardware structure of a base station 10 and a terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may also be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0394] Additionally, in the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of base station 10 and terminal 20 can be configured to include one or more of the devices shown in the figures, or it can be configured to not include any of them.

[0395] The functions of base station 10 and terminal 20 are implemented by reading predetermined software (program) into hardware such as processor 1001 and storage device 1002, so that processor 1001 performs calculations to control the communication of communication device 1004 or control at least one of reading and writing data in storage device 1002 and auxiliary storage device 1003.

[0396] The processor 1001 controls the computer as a whole, for example, by enabling the operating system to function. The processor 1001 may also be a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, the aforementioned control unit 140, control unit 240, etc., can also be implemented using the processor 1001.

[0397] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage devices 1003 and communication devices 1004, and performs various processes accordingly. As a program, a program is used that causes the computer to perform at least a portion of the actions described in the above embodiments. For example, Figure 34 The control unit 140 of the base station 10 shown can also be implemented by a control program stored in the storage device 1002 and operating in the processor 1001. Furthermore, for example, Figure 35 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and operating in the processor 1001. Regarding the various processes described above, although it has been stated that the various processes are executed by one processor 1001, the various processes can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed using more than one chip. Furthermore, the program can also be transmitted from a network via a telecommunications line.

[0398] Storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Storage device 1002 may also be referred to as a register, cache, main memory (main storage device), etc. Storage device 1002 is capable of storing programs (program code), software modules, etc., that are executable for implementing the communication method according to one embodiment of this disclosure.

[0399] Auxiliary storage device 1003 is a computer-readable recording medium, such as at least one of the following: CD-ROM (CompactDisc ROM), hard disk drive, floppy disk, magneto-optical disk (e.g., compact disk, digital multipurpose disk, Blu-ray disk), smart card, flash memory (e.g., card, stick, key drive), floppy disk, magnetic stripe, etc. Auxiliary storage device 1003 may also be referred to as an auxiliary storage device. The aforementioned storage medium may, for example, be a database, server, or other suitable media that includes at least one of storage device 1002 and auxiliary storage device 1003.

[0400] Communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network interface card (NIC), communication module, etc. Communication device 1004 may, for example, be configured to include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifiers, transceiver units, transmission path interfaces, etc., can also be implemented through communication device 1004. The transceiver unit may also be physically or logically separated into a transmitting unit and a receiving unit.

[0401] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0402] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be configured using a single bus or using different buses between the devices.

[0403] Furthermore, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or a FPGA (Field Programmable Gate Array), and can also implement some or all of the functional blocks through this hardware. For example, the processor 1001 can also be installed using at least one of these hardware components.

[0404] (Supplement to the implementation method)

[0405] The embodiments of the present invention have been described above, but the disclosed invention is not limited to these embodiments. Those skilled in the art should understand various modifications, alterations, substitutions, and replacements. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these values ​​are merely examples, and any appropriate values ​​may be used. The distinctions between items in the above description are not essential to the present invention; items described in two or more items may be combined as needed, and items described in one item may be applied to items 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. Physically, one component may perform the operation of multiple functional units, or multiple components may perform the operation of one functional unit. Regarding the processing described in the embodiments, the order of processing may be interchanged unless there is a contradiction. For ease of explanation, the base station 10 and terminal 20 have been described using functional block diagrams, but such a device may also be implemented in hardware, software, or a combination thereof. The software operating via the processor of the base station 10 according to an embodiment of the present invention and the software operating via the processor of the terminal 20 according to an embodiment of the present invention can also be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server and other suitable storage media, respectively.

[0406] Furthermore, the notification of information is not limited to the forms / implementations described in this disclosure, and other methods may also be used. For example, information notification may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Additionally, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0407] The various forms / implementations described in this disclosure can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), systems using other suitable systems, and next-generation systems extended therefrom. Furthermore, multiple systems can be combined (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) for application.

[0408] The processing procedures, timing, and flow of the various forms / implementations described in this specification may be rearranged in order, provided there is no contradiction. For example, the elements of various steps are indicated using an illustrative order for the methods described in this disclosure, but are not limited to the specific order indicated.

[0409] In this specification, certain actions purported to be performed by base station 10 may sometimes be performed through its upper node, depending on the circumstances. In a network consisting of one or more network nodes including base station 10, it is obvious that various actions performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes besides base station 10 (e.g., MME or S-GW, but not limited to these). The above example illustrates a case where there is only one other network node besides base station 10, but other network nodes can also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0410] It can output information or signals described in this disclosure from a higher (or lower) layer to a lower (or higher) layer. It can also be input or output via multiple network nodes.

[0411] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0412] The determination in this disclosure can be made by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value).

[0413] Software, whether called software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted as command, command set, code, code segment, program code, program, subroutine, software module, application, software application, software package, routine, subroutine, object, executable file, execution thread, procedure, function, etc.

[0414] Furthermore, software, commands, and information can be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technologies (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technologies (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0415] The information, signals, etc., described in this disclosure can also be represented using any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc., that may be involved in the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0416] Furthermore, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms that have the same or similar meanings. For example, at least one of the channel and symbol may also be a signal (signaling). Additionally, a signal may also be a message. Furthermore, a component carrier (CC) may also be referred to as a carrier frequency, cell, frequency carrier, etc.

[0417] The terms “system” and “network” as used in this disclosure are used interchangeably.

[0418] Furthermore, the information, parameters, etc., described in this disclosure may be represented using absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0419] The names used for the above parameters are not limiting names in any way. Furthermore, the formulas, etc., using these parameters sometimes differ from those explicitly disclosed in this disclosure. Since various channels (e.g., PUSCH, PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, the various names assigned to these various channels and information elements are not limiting names in any way.

[0420] In this disclosure, the terms "base station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" are used interchangeably. Sometimes, terms such as macro cell, small cell, femtocell, and picocell are also used to refer to base stations.

[0421] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, its coverage area can be divided into several smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small indoor cell tower (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base station and base station subsystem providing communication services within that coverage area.

[0422] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" can be used interchangeably.

[0423] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other appropriate terms.

[0424] At least one of the base station and the mobile station can be referred to as a transmitting device, a receiving device, a communication device, etc. Additionally, at least one of the base station and the mobile station can also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body can be a vehicle (e.g., a car, an airplane, etc.), a mobile body moving in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanized or unmanned). Furthermore, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0425] Furthermore, the base station in this disclosure can also be replaced by a terminal. For example, various forms / implementations of this disclosure can be applied to a structure that replaces the communication between the base station and the terminal with communication between multiple terminals 20 (e.g., also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminal 20 can also be configured to have the functions of the base station 10 described above. In addition, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "side"). For example, uplink channel, downlink channel, etc., can also be replaced with side channel.

[0426] Similarly, the terminal in this disclosure can be replaced by a base station. In this case, the base station can also be configured to have the functions of the terminal described above.

[0427] The terms "determining" and "determining" as used in this disclosure sometimes encompass a variety of actions. For example, "determining" and "determining" can include actions such as judging, calculating, computing, processing, deriving, investigating, searching (e.g., searching in a table, database, or other data structure), and ascertaining, which are considered as actions of "determining" and "determining." Furthermore, "determining" and "determining" can include actions such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in memory), which are considered as actions of "determining" and "determining." Additionally, "determining" and "determining" can include actions such as resolving, selecting, choosing, establishing, and comparing, which are considered as actions of "determining" and "determining." That is, "judgment" and "decision" can include matters that are considered to have been "judged" or "decided" to take certain actions. In addition, "judgment (decision)" can also be replaced by "assuming", "expecting", "considering", etc.

[0428] The terms “connected,” “coupled,” or any variations thereof are intended to indicate any direct or indirect connection or combination between two or more elements, including cases where there is one or more intermediate elements between the two elements that are “connected” or “coupled.” The combination or connection between elements can be physical, logical, or a combination of these. For example, “access” can be used instead of “connected.” In the context of this disclosure, it can be understood that two elements are “connected” or “coupled” to each other using at least one of one or more wires, cables, and printed electrical connections, and, as some non-limiting and non-inclusive examples, using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, and light (both visible and invisible) region to “connect” or “couple” to each other.

[0429] The reference signal can be simply referred to as RS (Reference Signal), or, depending on the standard applied, as a pilot.

[0430] As used in this disclosure, the word "based on" does not mean "based on only" unless otherwise expressly stated. In other words, the word "based on" means both "based on only" and "based on at least" both.

[0431] Any reference to elements using the designations "first," "second," etc., as used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not imply that only two elements can be taken or that in some form the first element must precede the second element.

[0432] Alternatively, the "unit" in the structure of the above devices can be replaced with "section", "circuit", "equipment", etc.

[0433] When the terms "include," "including," and their variations are used in this disclosure, these terms, like the term "comprising," imply inclusion. Furthermore, the term "or" as used in this disclosure implies non-exclusivity.

[0434] A radio frame can consist of one or more frames in the time domain. Each frame in the time domain can be called a subframe. A subframe can further consist of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) independent of the parameter set (numerology).

[0435] A parameter set can be communication parameters applied to at least one side of the transmission and reception of a signal or channel. For example, a parameter set can represent at least one of the following: Subcarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, and specific windowing processing performed by the transceiver in the time domain.

[0436] In the time domain, a time slot can be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A time slot can be a time unit based on a set of parameters.

[0437] A time slot can contain multiple mini-time slots. Each mini-time slot can consist of one or more symbols in the time domain. Furthermore, a mini-time slot can also be called a sub-time slot. A mini-time slot can consist of fewer symbols than a time slot. PDSCH (or PUSCH) transmitted in time units larger than mini-time slots can be called PDSCH (or PUSCH) mapping type (type) A. PDSCH (or PUSCH) transmitted using mini-time slots can be called PDSCH (or PUSCH) mapping type (type) B.

[0438] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols can also be referred to by other names corresponding to their respective components.

[0439] For example, a subframe can also be called a Transmission Time Interval (TTI), multiple consecutive subframes can also be called a TTI, a time slot or a mini-time slot can also be called a TTI. That is, at least one of a subframe and a TTI can be a subframe in existing LTE (1ms), a period shorter than 1ms (e.g., symbols 1-13), or a period longer than 1ms. In addition, the unit representing TTI may not be called a subframe, but rather a time slot, mini-time slot, etc.

[0440] Here, TTI is, for example, the smallest unit of time for scheduling in wireless communication. For instance, in an LTE system, the base station schedules the allocation of radio resources (bandwidth, transmit power, etc., available to each terminal 20) in units of TTI for each terminal 20. However, the definition of TTI is not limited to this.

[0441] The Time Interval (TTI) can be the transmission time unit for channel-coded data packets (transmission blocks), code blocks, codewords, etc., or it can be a processing unit for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the actual time interval (e.g., the number of symbols) in which the transmission block, code block, codeword, etc., are mapped can be shorter than that TTI.

[0442] Furthermore, when one time slot or one mini-time slot is referred to as a TTI, more than one TTI (i.e., more than one time slot or more than one mini-time slot) can constitute the minimum time unit for scheduling. Moreover, the number of time slots constituting this minimum time unit for scheduling (the number of mini-time slots) can be controlled.

[0443] A TTI with a duration of 1ms can also be referred to as a normal TTI (TTI in LTE Rel.8-12), a long TTI, a normal subframe, a long subframe, or a time slot. A TTI shorter than a normal TTI can also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub-time slot, or a time slot.

[0444] Additionally, for long TTIs (e.g., regular TTIs, subframes, etc.), they can be replaced with TTIs with a duration of more than 1ms. For short TTIs (e.g., shortened TTIs, etc.), they can be replaced with TTIs with a duration of less than long TTIs and a duration of more than 1ms.

[0445] A resource block (RB) is a unit of resource allocation in both the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set; for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0446] Furthermore, the time domain of an RB can contain one or more symbols, and can be 1 time slot, 1 mini-time slot, 1 subframe, or 1 TTI in length. 1 TTI, 1 subframe, etc., can each be composed of one or more resource blocks.

[0447] In addition, one or more RBs can be referred to as Physical Resource Block (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB Pair, RB Pair, etc.

[0448] Furthermore, a resource block can consist of one or more resource elements (REs). For example, 1 RE can be a radio resource area with 1 subcarrier and 1 symbol.

[0449] The Bandwidth Part (BWP) can represent a subset of contiguous common resource blocks (RBs) used for a certain parameter set in a given carrier. Here, common RBs can be determined by indexing RBs based on a common reference point of that carrier. PRBs can be defined and numbered within a BWP.

[0450] A BWP can include a UL BWP and a DL BWP. One or more BWPs can be set for a UE within one carrier.

[0451] At least one of the configured BWPs can be active, and it is not assumed that the UE will transmit or receive predetermined signals / channels outside of an active BWP. Furthermore, the terms "cell," "carrier," etc., used in this disclosure can be replaced with "BWP."

[0452] The structures of radio frames, subframes, time slots, mini-time slots, and symbols described above are merely illustrative. For example, the number of subframes contained in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots contained in a time slot, the number of symbols and RBs contained in a time slot or mini-time slot, the number of subcarriers contained in an RB, the number of symbols in a TTI, the symbol length, the length of the cyclic prefix (CP), etc., can be varied.

[0453] In this disclosure, for example, in cases where articles are added through translation, such as in English (e.g., a, an, and the), this disclosure may also include cases where the noun following these articles is in a plural form.

[0454] In this disclosure, the phrase "A is different from B" can also mean "A and B are not the same." Furthermore, this phrase can also mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0455] The various forms / implementations described in this disclosure can be used individually, in combination, or switched during execution. Furthermore, the notification of predetermined information is not limited to explicit notification (e.g., a "Yes X" notification) but can also be implicit notification (e.g., not notifying the predetermined information).

[0456] Additionally, in this disclosure, the SS block or CSI-RS is an example of a synchronization signal or reference signal.

[0457] The present disclosure has been described in detail above, but it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the present disclosure is for illustrative purposes only and is not intended to be limiting.

[0458] Label Explanation

[0459] 10: Base station;

[0460] 110: Dispatch Department;

[0461] 120: Receiving Unit;

[0462] 130: Setting Department;

[0463] 140: Control Department;

[0464] 20: Terminal;

[0465] 210: Sending Department;

[0466] 220: Receiving unit;

[0467] 230: Setting Department;

[0468] 240: Control Unit;

[0469] 1001: Processor;

[0470] 1002: Storage device;

[0471] 1003: Auxiliary storage device;

[0472] 1004: Communication devices;

[0473] 1005: Input device;

[0474] 1006: Output device.

Claims

1. A terminal having: The receiving unit receives resource allocation information transmitted from the side link of at least one of the first operator and the second operator from the base station of the first operator. The control unit, based on the resource allocation information, determines whether to perform sidelink transmission using resources allocated from the base station; and When the transmitting unit determines that it needs to perform the side-link transmission, it executes the side-link transmission. The receiving unit is designed to receive signals destined for multiple terminals from the base stations of each operator during each PDCCH monitoring period. If no signals destined for multiple terminals are received during a certain PDCCH monitoring period, the transmitting unit will not perform sidelink transmission through the resources corresponding to that PDCCH monitoring period.

2. The terminal according to claim 1, wherein, The transmitting unit transmits the resource allocation information received from the base station via a side link.

3. A terminal having: The receiving unit receives resource allocation information sent by the side link of the first operator via the side link; The control unit, based on the resource allocation information, determines whether to perform sidelink transmission; and When the transmitting unit determines that it needs to perform the side-link transmission, it executes the side-link transmission. The receiving unit is designed to receive signals destined for multiple terminals from the base stations of each operator during each PDCCH monitoring period. If no signals destined for multiple terminals are received during a certain PDCCH monitoring period, the transmitting unit will not perform sidelink transmission through the resources corresponding to that PDCCH monitoring period.

4. The terminal according to claim 3, wherein, The transmitting unit sends the resource allocation information to the base station of the second operator.

5. A base station, comprising: The receiving unit receives resource allocation information sent by the side link in the first operator via the uplink; The control unit, based on the resource allocation information, determines the resources used for sidelink transmission by the second operator's terminal; and The transmitting unit sends resource allocation information determined by the control unit to the terminal of the second operator. The terminal is designed to receive signals destined for multiple terminals from base stations of various operators during each PDCCH monitoring period. If no signals destined for multiple terminals are received during a certain PDCCH monitoring period, the terminal will not transmit via the sidelink through the resources corresponding to that PDCCH monitoring period.

6. A sending method, executed by a terminal, comprising the following steps: Receive resource allocation information from the base station of the first operator via the side link of at least one of the first operator and the second operator; Based on the resource allocation information, determine whether sidelink transmission using resources allocated from the base station has been performed; as well as If it is determined that the sidelink transmission needs to be performed, then the sidelink transmission is executed. The terminal is designed to receive signals destined for multiple terminals from base stations of various operators during each PDCCH monitoring period. If no signals destined for multiple terminals are received during a certain PDCCH monitoring period, the terminal will not transmit via the sidelink through the resources corresponding to that PDCCH monitoring period.

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