WO2023218879A1

WO2023218879A1 - Terminal and communication method

Info

Publication number: WO2023218879A1
Application number: PCT/JP2023/015580
Authority: WO
Inventors: 翔平吉岡; 尚哉芝池; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2022-05-11
Filing date: 2023-04-19
Publication date: 2023-11-16

Abstract

A terminal according to the present invention comprises: a communication unit that performs transmission and reception in a first radio access technology (RAT); and a control unit that controls communication in the first RAT, wherein the communication unit receives, from another terminal, information indicating that there is a conflict between a resource reservation in the first RAT and a resource reservation in a second RAT in at least a time domain, the control unit performs, on the basis of the information indicating that there is the conflict, at least one of an operation for determining a resource set usable in the first RAT in a physical layer and an operation for selecting a resource from the resource set in a medium access control (MAC) layer, and the communication unit uses the resource that has been selected by the resource selection operation to perform transmission to the another terminal.

Description

Terminal and communication method

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

In LTE (Long Term Evolution) and LTE successor systems (for example, LTE-A (LTE Advanced), NR (New Radio) (also referred to as 5G)), D2D is a system in which terminals communicate directly with each other without going through a base station. (Device to Device) technology is being considered (for example, Non-Patent Document 1).

D2D reduces traffic between terminals and base stations, and enables communication between terminals even if the base station becomes unable to communicate during a disaster or the like. Note that in 3GPP (registered trademark) (3rd Generation Partnership Project), D2D is referred to as "sidelink," but in this specification, the more general term D2D is used. However, in the description of the embodiments to be described later, side links will also be used as necessary.

D2D communication consists of D2D discovery (also called D2D discovery) for discovering other terminals that can communicate with each other, and D2D communication (D2D direct communication, direct communication between terminals) for direct communication between terminals. (also referred to as communications, etc.). Hereinafter, when D2D communication, D2D discovery, etc. are not particularly distinguished, they will simply be referred to as D2D. Further, a signal transmitted and received by D2D is called a D2D signal. Various use cases of services related to V2X (Vehicle to Everything) in NR are being considered (for example, Non-Patent Document 2).

For example, a side link in a certain RAT (Radio Access Technology) supports a transmission mode in which a terminal autonomously determines the resources to be used for transmission. Furthermore, a transmission mode in which a terminal autonomously determines resources to be used for transmission is also supported for side links in other RATs. In this transmission mode, terminals detect future resource usage by decoding each other's signals and operate to avoid collisions. However, the side link of one RAT and the side link of another RAT are defined as different signals, and it is not possible to detect each other and avoid collision. Therefore, it has been difficult for the sidelinks of one RAT and the sidelinks of another RAT to share resources.

The present invention has been made in view of the above points, and its purpose is to share resources between direct communications between terminals using different RATs (Radio Access Technologies).

According to the disclosed technology, a first RAT (Radio Access Technology) includes a communication unit that performs transmission and reception, and a control unit that controls communication in the first RAT, and the communication unit receiving information from another terminal indicating that a resource reservation in the first RAT and a resource reservation in the second RAT conflict at least in the time domain; The communication unit executes at least one of an operation of determining a possible resource set and an operation of selecting a resource from the resource set in a MAC (Medium Access Control) layer based on the information indicating the conflict, and the communication unit: A terminal is provided that performs transmission to another terminal using the resource selected by the resource selection operation.

According to the disclosed technology, resources can be shared between direct communications between terminals that use different RATs (Radio Access Technologies).

It is a diagram for explaining V2X. FIG. 2 is a diagram for explaining an example (1) of a V2X transmission mode. FIG. 7 is a diagram for explaining an example (2) of V2X transmission mode. FIG. 7 is a diagram for explaining an example (3) of V2X transmission mode. FIG. 7 is a diagram for explaining an example (4) of V2X transmission mode. FIG. 7 is a diagram for explaining an example (5) of V2X transmission mode. FIG. 2 is a diagram for explaining an example (1) of V2X communication type. FIG. 6 is a diagram for explaining an example (2) of V2X communication type. FIG. 7 is a diagram for explaining an example (3) of V2X communication type. It is a sequence diagram which shows the example (1) of V2X operation. It is a sequence diagram which shows the example (2) of V2X operation. It is a sequence diagram which shows the example (3) of V2X operation. It is a sequence diagram which shows the example (4) of V2X operation. FIG. 3 is a diagram showing an example of sensing operation. 3 is a flowchart for explaining an example of preemption operation. FIG. 3 is a diagram illustrating an example of preemption operation. FIG. 6 is a diagram illustrating an example of partial sensing operation. FIG. 3 is a diagram for explaining an example of periodic partial sensing. FIG. 3 is a diagram for explaining an example of continuous partial sensing. FIG. 3 is a diagram for explaining an example (1) of communication status. FIG. 7 is a diagram for explaining an example (2) of communication status. FIG. 7 is a diagram for explaining an example (3) of communication status. FIG. 7 is a diagram for explaining an example (4) of communication status. FIG. 7 is a diagram for explaining an example (5) of communication status. FIG. 3 is a sequence diagram for explaining an example of cooperation between UEs. FIG. 2 is a diagram for explaining an example of NR-SL and LTE-SL. It is an example of information sharing in an embodiment of the present invention. It is a figure which shows the example (1) of resource exclusion in embodiment of this invention. It is a figure which shows the example (2) of resource exclusion in embodiment of this invention. 1 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. It is a diagram showing an example of a functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 2 is a diagram showing an example of the hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. It is a figure showing an example of composition of vehicle 2001 in an embodiment of the present invention.

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

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

Further, in the embodiment of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or another method (for example, Flexible Duplex, etc.). This method may also be used.

Furthermore, in the embodiment of the present invention, "configure" the wireless parameters etc. may mean pre-configuring a predetermined value, or may mean that the base station 10 or Wireless parameters notified from the terminal 20 may also be set.

FIG. 1 is a diagram for explaining V2X. In 3GPP, the realization of V2X (Vehicle to Everything) or eV2X (enhanced V2X) by expanding D2D functions is being considered and specifications are being developed. As shown in Figure 1, V2X is a part of ITS (Intelligent Transport Systems), and refers to V2V (Vehicle to Vehicle), which is a form of communication between vehicles. V2I (Vehicle to Infrastructure), which refers to the form of communication between the vehicle and the ITS server (RSU: Road-Side Unit); V2N (Vehicle to Network), which refers to the form of communication between the vehicle and the ITS server; , is a general term for V2P (Vehicle to Pedestrian), which refers to a form of communication performed between a vehicle and a mobile terminal carried by a pedestrian.

Additionally, in 3GPP, V2X using LTE or NR cellular communication and terminal-to-terminal communication is being considered. V2X using cellular communication is also called cellular V2X. In NR's V2X, studies are underway to realize large capacity, low latency, high reliability, and QoS (Quality of Service) control.

It is expected that studies on LTE or NR V2X that are not limited to 3GPP specifications will proceed in the future. For example, ensuring interoperability, reducing costs by implementing upper layers, combining or switching multiple RATs (Radio Access Technology), compliance with regulations in each country, data acquisition and distribution of LTE or NR V2X platforms, database management, and It is assumed that the usage method will be considered.

In the embodiments of the present invention, a mode in which the communication device is mounted on a vehicle is mainly assumed, but the embodiments of the present invention are not limited to this mode. For example, the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or an aircraft, the communication device may be a base station, RSU, relay station (relay node), It may also be a terminal or the like that has scheduling capability.

Note that SL (Sidelink) may be distinguished from UL (Uplink) or DL (Downlink) based on any one or a combination of 1) to 4) below. Moreover, SL may have another name.
1) Time domain resource allocation 2) Frequency domain resource allocation 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))
4) Reference signal used for path loss measurement for transmission power control

Regarding OFDM (Orthogonal Frequency Division Multiplexing) of SL or UL, CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), OFDM without Transform precoding or Transform rm precoded Any of the following OFDM methods may be applied.

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

Note that the slot in the embodiment of the present invention may be read as a symbol, minislot, subframe, radio frame, or TTI (Transmission Time Interval). Furthermore, a cell in an embodiment of the present invention may be read as a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.

Note that in the embodiment of the present invention, the terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication. For example, the terminal 20 may be a terminal owned by a user such as a smartphone, or may be an IoT (Internet of Things) device such as a smart meter.

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

FIG. 3 is a diagram for explaining an example (2) of V2X transmission mode. In the sidelink communication transmission mode shown in FIG. 3, in step 1, the terminal 20A uses autonomously selected resources to transmit the PSCCH and PSSCH to the terminal 20B. The transmission mode of sidelink communication shown in FIG. 3 may be referred to as sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, the UE itself performs the resource selection.

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

FIG. 5 is a diagram for explaining an example (4) of V2X transmission mode. In the sidelink communication transmission mode shown in FIG. 5, in step 0, a sidelink resource pattern is transmitted from the base station 10 to the terminal 20A via RRC (Radio Resource Control) settings, or is set in advance. Subsequently, the terminal 20A transmits the PSSCH to the terminal 20B based on the resource pattern (step 1). The transmission mode of sidelink communication shown in FIG. 5 may be referred to as sidelink transmission mode 2c in NR.

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

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

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

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

Additionally, in NR-V2X, it is assumed that HARQ (Hybrid automatic repeat request) will be supported for sidelink unicast and group cast. Furthermore, SFCI (Sidelink Feedback Control Information) including HARQ responses is defined in NR-V2X. Furthermore, it is being considered that SFCI is transmitted via PSFCH (Physical Sidelink Feedback Channel).

Note that in the following description, PSFCH is used in transmitting HARQ-ACK on the side link, but this is just an example. For example, PSCCH may be used to transmit HARQ-ACK on the side link, PSSCH may be used to transmit HARQ-ACK on the side link, or other channels may be used to transmit HARQ-ACK on the side link. HARQ-ACK may be transmitted on the side link using the HARQ-ACK.

Hereinafter, for convenience, all information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK. This HARQ-ACK may be referred to as HARQ-ACK information. More specifically, a codebook applied to HARQ-ACK information reported from the terminal 20 to the base station 10 etc. is called a HARQ-ACK codebook. The HARQ-ACK codebook defines a bit string of HARQ-ACK information. Note that with "HARQ-ACK", in addition to ACK, NACK is also transmitted.

FIG. 10 is a sequence diagram showing an example of V2X operation (1). As shown in FIG. 10, the wireless communication system according to the embodiment of the present invention may include a terminal 20A and a terminal 20B. Although there are actually many user devices, FIG. 10 shows the terminal 20A and the terminal 20B as an example.

Hereinafter, unless the

terminals

20A, 20B, etc. are particularly distinguished, they will be simply referred to as "terminal 20" or "user device." Although FIG. 10 shows, as an example, a case where both the terminal 20A and the terminal 20B are within the coverage of the cell, the operation in the embodiment of the present invention can also be applied when the terminal 20B is outside the coverage.

As described above, in this embodiment, the terminal 20 is a device mounted on a vehicle such as a car, and has a cellular communication function as a UE in LTE or NR, and a side link function. There is. The terminal 20 may be a general mobile terminal (such as a smartphone). Further, the terminal 20 may be an RSU. The RSU may be a UE type RSU having UE functionality, or a gNB type RSU having base station device functionality.

Note that the terminal 20 does not need to be a device in one housing, and for example, even if various sensors are distributed and arranged within the vehicle, the terminal 20 may be a device including the various sensors.

Furthermore, the processing content of the side link transmission data of the terminal 20 is basically the same as the processing content of UL transmission in LTE or NR. For example, the terminal 20 scrambles and modulates the codeword of the transmission data to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to one or two layers, and performs precoding. The precoded complex-valued symbols are then mapped to resource elements to generate transmission signals (e.g., complex-valued time-domain SC-FDMA signals) and transmitted from each antenna port.

Note that the base station 10 has a cellular communication function as a base station in LTE or NR, and a function to enable communication of the terminal 20 in this embodiment (e.g., resource pool setting, resource allocation, etc.). have. Further, the base station 10 may be an RSU (gNB type RSU).

Further, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by the terminal 20 for SL or UL may be OFDMA, SC-FDMA, or other signal waveform. It may be.

In step S101, the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined period. A resource selection window may be set from the base station 10 to the terminal 20. Here, regarding the predetermined period of the resource selection window, the period may be defined by terminal implementation conditions such as processing time or maximum allowable packet delay time, or the period may be defined in advance by specifications, The predetermined period may be called an interval in the time domain.

In steps S102 and S103, the terminal 20A uses the resources autonomously selected in step S101 to transmit SCI (Sidelink Control Information) on the PSCCH and/or PSSCH, and transmits SL data on the PSSCH. For example, the terminal 20A may transmit the PSCCH using the same time resource as at least part of the time resource of the PSSCH, and using a frequency resource that is adjacent to or not adjacent to the frequency resource of the PSSCH.

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

In step S104, the terminal 20B uses the PSFCH resource determined from the received SCI to transmit HARQ-ACK for the received data to the terminal 20A.

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

Note that if HARQ control with HARQ feedback is not performed, step S104 and step S105 may not be performed.

FIG. 11 is a sequence diagram showing operation example (2) of V2X. Blind retransmission without HARQ control may be performed to improve transmission success rate or reach.

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

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

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

Note that if blind retransmission is not performed, step S204 may not be performed.

FIG. 12 is a sequence diagram showing an example (3) of V2X operation. The base station 10 may perform sidelink scheduling. That is, the base station 10 may determine the side link resource used by the terminal 20 and transmit information indicating the resource to the terminal 20. Furthermore, when HARQ control with HARQ feedback is applied, the base station 10 may transmit information indicating PSFCH resources to the terminal 20.

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

Furthermore, in step S301, it is assumed that the base station 10 also transmits DCI for DL scheduling (also referred to as DL allocation) to the terminal 20A via PDCCH. Hereinafter, for convenience, the DCI for DL scheduling will be referred to as DL scheduling DCI. The terminal 20A that has received the DL scheduling DCI receives DL data on the PDSCH using the resources specified by the DL scheduling DCI.

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

The terminal 20B receives the SCI (PSCCH and/or PSSCH) and SL data (PSSCH) transmitted from the terminal 20A. The SCI received on the PSCCH and/or PSSCH includes information on PSFCH resources for the terminal 20B to transmit HARQ-ACK in response to reception of the data.

Information on the resource is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the information on the resource from the DL scheduling DCI or SL scheduling DCI and uses the SCI. Include in. Alternatively, the DCI transmitted from the base station 10 may not include information on the resource, and the terminal 20A may autonomously include the information on the resource in the SCI and transmit it.

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

In step S305, the terminal 20A transmits, for example, the PUCCH ( The HARQ-ACK is transmitted using the physical uplink control channel) resource, and the base station 10 receives the HARQ-ACK. The HARQ-ACK codebook may include a HARQ-ACK generated based on the HARQ-ACK received from the terminal 20B or a PSFCH not received, and a HARQ-ACK for DL data. However, if DL data is not allocated, HARQ-ACK for DL data is not included. NR Rel. In No. 16, the HARQ-ACK codebook does not include HARQ-ACK for DL data.

Note that if HARQ control with HARQ feedback is not performed, step S304 and/or step S305 may not be performed.

FIG. 13 is a sequence diagram showing operation example (4) of V2X. As described above, in the NR sidelink, it is supported that the HARQ response is transmitted on the PSFCH. Note that a format similar to PUCCH (Physical Uplink Control Channel) format 0 can be used as the format of PSFCH, for example. That is, the format of the PSFCH may be a sequence-based format in which the PRB (Physical Resource Block) size is 1, and ACKs and NACKs are identified by differences in sequence and/or cyclic shift. The format of PSFCH is not limited to this. The PSFCH resource may be allocated to the last symbol or the last plural symbols of the slot. Furthermore, it is defined in advance whether a period N is set in the PSFCH resource. The period N may be set in units of slots or may be predefined.

In FIG. 13, the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH may be placed in one symbol at the beginning of the slot, in multiple symbols from the beginning, or in multiple symbols starting from a symbol other than the beginning. The PSFCH may be placed in one symbol at the end of the slot, or may be placed in multiple symbols at the end of the slot. Note that the above-mentioned "head of slot" and "end of slot" may omit consideration of symbols for AGC (Automatic Gain Control) and symbols for transmission/reception switching. That is, for example, when one slot is composed of 14 symbols, "the beginning of the slot" and "the end of the slot" mean the first and last symbols, respectively, among the 12 symbols excluding the first and last symbols. It's okay. In the example shown in FIG. 13, three subchannels are set in the resource pool, and two PSFCHs are arranged three slots after the slot in which the PSSCH is arranged. The arrow from PSSCH to PSFCH indicates an example of PSFCH associated with PSSCH.

If the HARQ response in NR-V2X group cast is group cast option 2, which transmits ACK or NACK, it is necessary to determine the resources to be used for transmitting and receiving the PSFCH. As shown in FIG. 13, in step S401, the terminal 20A, which is the transmitting terminal 20, performs a group cast to the receiving terminals 20, which are the

terminals

20B, 20C, and 20D, via the SL-SCH. In the following step S402, the terminal 20B uses PSFCH #B, the terminal 20C uses PSFCH #C, and the terminal 20D uses PSFCH #D to transmit the HARQ response to the terminal 20A. Here, as shown in the example of FIG. 13, if the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to decide how to allocate the PSFCH resources. . Note that the transmitting terminal 20 may know the number of receiving terminals 20 in the group cast. Note that in group cast option 1, only NACK is transmitted as the HARQ response, and ACK is not transmitted.

FIG. 14 is a diagram showing an example of sensing operation in NR. In resource allocation mode 2, the terminal 20 selects a resource and performs transmission. As shown in FIG. 14, the terminal 20 performs sensing using a sensing window within the resource pool. Through sensing, the terminal 20 receives a resource reservation field or a resource assignment field included in the SCI transmitted from another terminal 20, and selects a resource in the resource pool based on the field. Identify available resource candidates within a resource selection window. Subsequently, the terminal 20 randomly selects a resource from available resource candidates.

Furthermore, as shown in FIG. 14, the resource pool settings may have a periodicity. For example, the period may be a period of 10240 milliseconds. FIG. 14 is an example in which slot t ₀ ^SL to slot t _Tmax-1 ^SL are set as a resource pool. Areas of the resource pool within each period may be set using, for example, a bitmap.

Further, as shown in FIG. 14, it is assumed that the transmission trigger in the terminal 20 occurs in slot n, and the priority of the transmission is p _TX . The terminal 20 can detect, for example, that another terminal 20 is transmitting priority p _RX in the sensing window from slot nT ₀ to the slot immediately before slot nT _proc,0. . If an SCI is detected within the sensing window and RSRP (Reference Signal Received Power) exceeds a threshold, the resource within the resource selection window corresponding to the SCI is excluded. Further, if an SCI is detected within the sensing window and the RSRP is less than the threshold, the resource within the resource selection window corresponding to the SCI is not excluded. The thresholds may be, for example, thresholds Th _{pTX, pRX} _that are set or defined for each resource within the sensing window based on the priority p _TX and the priority p RX.

Further, like slot t _m ^SL shown in FIG. 14, resources within the resource selection window that are candidates for resource reservation information corresponding to resources within the sensing window that are not monitored, for example, for transmission, are excluded.

As shown in FIG. 14, in the resource selection window from slot n+T ₁ to slot n+T ₂ , resources occupied by other UEs are identified, and resources from which these resources are excluded become usable resource candidates. Assuming that the set of usable resource candidates is S _A , if S _A is less than 20% of the resource selection window, the thresholds Th _{pTX and pRX} set for each resource in the sensing window are increased by 3 dB and the resource selection is performed again. Identification may be performed. That is, by increasing the thresholds Th _{pTX and pRX} and performing resource identification again, the number of resources that are not excluded because their RSRPs are less than the thresholds is increased, and the set of resource candidates S _A becomes 20% or more of the resource selection window. You may do so. If S _A is less than 20% of the resource selection window, the operation of increasing the thresholds Th _{pTX and pRX} set for each resource in the sensing window by 3 dB and performing resource identification again may be repeated.

The lower layer of the terminal 20 may report _SA to the upper layer. The upper layer of the terminal 20 may perform random selection on the _SA to determine the resources to be used. The terminal 20 may perform sidelink transmission using the determined resources. For example, the upper layer may be a MAC layer, and the lower layer may be a PHY layer or a physical layer.

In FIG. 14 described above, the operation of the transmitting terminal 20 has been explained, but the receiving terminal 20 detects data transmission from another terminal 20 based on the result of sensing or partial sensing, and transmits data to the other terminal 20. Data may be received from 20.

FIG. 15 is a flowchart illustrating an example of preemption in NR. FIG. 16 is a diagram showing an example of preemption in NR. In step S501, the terminal 20 performs sensing using the sensing window. When the terminal 20 performs power saving operation, sensing may be performed in a predefined limited period. Next, the terminal 20 identifies each resource within the resource selection window based on the sensing results, determines a resource candidate set _SA , and selects a resource to be used for transmission (S502). Subsequently, the terminal 20 selects a resource set (r_0, r_1, . . . ) for determining preemption from the resource candidate set _SA (S503). The resource set may be notified from the upper layer to the PHY layer as a resource for determining whether or not it has been preempted.

In step S504, the terminal 20 re-identifies each resource within the resource selection window based on the sensing results and determines a resource candidate set S _A at timing T(r_0) _-T3 shown in FIG. , further determines whether to preempt the resource set (r_0, r_1, . . . ) based on the priority. For example, r_1 shown in FIG. 16 is not included in _SA because the SCI transmitted from another terminal 20 has been detected by re-sensing. When preemption is enabled, if the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is lower than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the terminal 20 uses the resource r_1. It is determined that it has been preempted. Note that the lower the value indicating the priority, the higher the priority. That is, if the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is higher than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, the terminal 20 does not exclude resource r_1 from _SA . . Alternatively, if preemption is valid only for a specific priority (for example, sl-PreemptionEnable is one of pl1, pl2, ..., pl8), this priority is set as prio_pre. At this time, if the value prio_RX indicating the priority of the SCI transmitted from the other terminal 20 is lower than prio_pre, and prio_RX is lower than the value prio_TX indicating the priority of the transport block transmitted from the own terminal, The terminal 20 determines that the resource r_1 has been preempted.

In step S505, if preemption is determined in step S504, the terminal 20 notifies the upper layer of the preemption, reselects resources in the upper layer, and ends the preemption check.

Note that when performing re-evaluation instead of checking preemption, in step S504 described above, after determining the set of resource candidates _SA , the resource set (r_0, r_1,...) is assigned to _SA . If the resource is not included, the resource is not used and the resource is reselected in the upper layer.

FIG. 17 is a diagram illustrating an example of partial sensing operation in LTE. When partial sensing is configured from an upper layer in the LTE sidelink, the terminal 20 selects a resource and performs transmission, as shown in FIG. 17. As shown in FIG. 17, the terminal 20 performs partial sensing for a portion of the sensing window in the resource pool, that is, the sensing target. Through partial sensing, the terminal 20 receives the resource reservation field included in the SCI transmitted from other terminals 20 and identifies available resource candidates within the resource selection window within the resource pool based on the field. . Subsequently, the terminal 20 randomly selects a resource from available resource candidates.

FIG. 17 is an example in which subframe t ₀ ^SL to subframe t _Tmax-1 ^SL is set as a resource pool. The target area of the resource pool may be set using, for example, a bitmap. As shown in FIG. 17, it is assumed that the transmission trigger in terminal 20 occurs in subframe n. As shown in FIG. 17, Y subframes from subframe t _y1 ^SL to subframe t _yY ^SL among subframe n+T ₁ to subframe n+T ₂ may be set as the resource selection window.

The terminal 20 is, for example, another terminal 20 transmitting at one or more sensing targets from subframe t _y1-k×Pstep ^SL to subframe t _yY-k×Pstep ^SL , which has a subframe length of Y. can be detected. k may be determined by a 10-bit bitmap, for example. FIG. 17 shows an example in which the third and sixth bits of the bitmap are set to "1" indicating that partial sensing is performed. That is, in FIG. 17, from subframe _ty1-6×Pstep ^SL to subframe _tyY-6×Pstep ^SL , and from subframe _ty1-3×Pstep ^SL to subframe _tyY-3×Pstep ^SL. Set as a sensing target. As mentioned above, the kth bit of the bitmap may correspond to a sensing window from subframe t _y1-k×Pstep ^SL to subframe t _yY-k×Pstep ^SL . Note that y _i corresponds to the index (1...Y) within the Y subframe.

Note that k may be set or predefined in a 10-bit bitmap, and P _step may be 100 ms. However, when performing SL communication using DL and UL carriers, P _step may be (U/(D+S+U))*100ms. U corresponds to the number of UL subframes, D corresponds to the number of DL subframes, and S corresponds to the number of special subframes.

If an SCI is detected in the above sensing target and the RSRP is above the threshold, the resources within the resource selection window corresponding to the resource reservation field of the SCI are excluded. Additionally, if an SCI is detected in the sensing target and the RSRP is less than the threshold, the resources within the resource selection window corresponding to the resource reservation field of the SCI are not excluded. The thresholds may be, for example, thresholds Th _{pTX, pRX} that are set or defined for each resource within the sensing target based on the transmitting side priority p _TX and the receiving side priority p _RX .

As shown in FIG. 17, in the resource selection window set in the Y subframe of the interval [n+T ₁ , n+T ₂ ], the terminal 20 identifies the resources occupied by other UEs, and identifies the resources excluding the resources. are available resource candidates. Note that the Y subframes do not have to be consecutive. Assuming that the set of available resource candidates is S _A , if S _A is less than 20% of the resources in the resource selection window, the thresholds Th _{pTX and pRX} set for each sensing target resource are increased by 3 dB and the process is performed again. Resource identification may also be performed.

That is, by increasing the thresholds Th _{pTX and pRX} and performing resource identification again, the number of resources that are not excluded because the RSRP is less than the threshold may be increased. Furthermore, the RSSI of each resource in _SA may be measured, and the resource with the minimum RSSI may be added to the set _SB . The operation of adding the resource with the smallest RSSI included in _SA to _SB may be repeated until the resource candidate set _SB becomes 20% or more of the resource selection window.

The lower layer of the terminal 20 may report the _SB to the upper layer. The upper layer of the terminal 20 may perform random selection on the _SB to determine the resources to be used. The terminal 20 may perform sidelink transmission using the determined resources. Note that, once the terminal 20 secures the resource, it may periodically use the resource without performing sensing for a predetermined number of times (for example, _Cresel times).

Here, in the NR Release 17 sidelink, power saving based on random resource selection and partial sensing is being considered. For example, random resource selection and partial sensing of sidelinks in LTE Release 14 may be applied to resource allocation mode 2 of NR Release 16 sidelinks for power saving. The terminal 20 to which partial sensing is applied performs reception and sensing only in specific slots within the sensing window.

Furthermore, in the NR Release 17 sidelink, operation is being considered with inter-UE coordination as a baseline. For example, terminal 20A may share information indicating the resource set with terminal 20B, and terminal 20B may consider this information in selecting resources for transmission.

For example, as a resource allocation method in the side link, the terminal 20 may perform full sensing as shown in FIG. 14. Furthermore, the terminal 20 may perform partial sensing in which resource identification is performed by sensing only limited resources compared to full sensing, and resource selection is performed from the identified resource set. Furthermore, the terminal 20 sets the resources in the resource selection window as an identified resource set, without excluding resources from the resources in the resource selection window, and performs random selection to select resources from the identified resource set. You may.

Note that a method of performing random selection at the time of resource selection and using sensing information at the time of re-evaluation or preemption check may be treated as partial sensing or random selection.

Note that 1) and 2) shown below may be applied as the sensing operation. Note that sensing and monitoring may be interchanged with each other, and the operation may include at least one of measurement of received RSRP, acquisition of reserved resource information, and acquisition of priority information.

1) Periodic-based partial sensing
In a system where only some slots are sensed, the operation of determining the sensing slot based on the reservation periodicity. Note that the reservation period is a value related to a resource reservation period field. Note that the period may be replaced with periodicity.

2) Contiguous partial sensing
An operation in which sensing slots are determined based on aperiodic reservation in a system where only some slots are sensed. Note that the aperiodic reservation is a value related to a time resource assignment field.

In Release 17, operations may be defined assuming three types of terminals 20. One is type A, and a type A terminal 20 does not have the ability to receive any sidelink signals and channels. However, receiving PSFCH and S-SSB may be an exception.

The other one is type B, and the type B terminal 20 does not have the ability to receive any sidelink signals and channels except for PSFCH and S-SSB reception.

The other one is type D, and the type D terminal 20 has the ability to receive all sidelink signals and channels defined in Release 16. However, this does not exclude receiving some sidelink signals and channels.

Note that UE types other than the above types A, B, and D may be assumed, and the UE type and the UE capability may or may not be associated with each other.

Additionally, in Release 17, multiple resource allocation methods can be set for a certain resource pool. Additionally, SL-DRX (Discontinuous reception) is supported as one of the power saving functions. That is, the reception operation is performed only in a predetermined time interval.

As mentioned above, partial sensing is supported as one of the power saving functions. In the resource pool in which partial sensing is configured, the terminal 20 may perform the periodic partial sensing described above. The terminal 20 may receive from the base station 10 information for configuring a resource pool in which partial sensing is configured and periodic reservation is enabled.

FIG. 18 is a diagram for explaining an example of periodic partial sensing. As shown in FIG. 18, Y candidate slots for resource selection are selected from the resource selection window [n+T ₁ , n+T ₂ ].

Sensing may be performed using t _y ^SL as one slot included in the Y candidate slots and t _{y−k×Preserve} ^SL as a target slot for periodic partial sensing.

P _reserve may correspond to all values included in the configured or predefined set sl-ResourceReservePeriodList. Alternatively, the value of P _reserve limited to a subset of sl-ResourceReservePeriodList may be set or predefined. P _reserve and sl-ResourceReservePeriodList may be set for each transmission resource pool in resource allocation mode 2. Furthermore, as a UE implementation, the periods included in the sl-ResourceReservePeriodList other than the limited subset may be monitored. For example, the terminal 20 may additionally monitor opportunities to support P_RSVP_Tx.

Regarding the k value, the terminal 20 may monitor the newest sensing opportunity in a certain reservation period before slot n of the resource selection trigger or before the first slot of Y candidate slots subject to processing time limitations. Additionally, the terminal 20 may additionally monitor periodic sensing opportunities corresponding to a set of one or more k values. For example, as the k value, a value corresponding to the newest sensing opportunity in a certain reservation cycle before slot n of the resource selection trigger or before the first slot of Y candidate slots subject to processing time restrictions, and a value corresponding to the latest sensing opportunity in a certain reservation cycle, and The value corresponding to the sensing opportunity immediately before the most recent sensing opportunity may be set.

As mentioned above, partial sensing is supported as one of the power saving functions. In the resource pool in which partial sensing is configured, the terminal 20 may perform the continuous partial sensing described above. The terminal 20 may receive from the base station 10 information for configuring a resource pool in which partial sensing is configured and aperiodic reservation is enabled.

FIG. 19 is a diagram for explaining an example of continuous partial sensing. As shown in FIG. 19, when the resource selection trigger is slot n, the terminal 20 selects Y candidate slots for resource selection from the resource selection window [n+T ₁ , n+T ₂ ]. FIG. 19 is an example when Y=7. As shown in FIG. 19, the beginning of the Y candidate slots is expressed as slot _ty1 , the next slot is expressed as _ty2 , . . . the end of the Y candidate slots is expressed as slot _tyY .

The terminal 20 performs sensing in the interval [n+T _A , n+T _B ], and executes resource selection in n+T _B or after n+T _B (referred to as n+T _C ). Note that the periodic partial sensing described above may be additionally performed. Note that T _A and T _B in the interval [n+T _A , n+T _B ] may have any value. Further, n may be replaced with the index of any slot among the Y candidate slots.

Further, the symbol [may be replaced with the symbol (and the symbol] may be replaced with the symbol). Note that, for example, the section [a, b] is a section from slot a to slot b, and includes slot a and slot b. For example, the section (a, b) is a section from slot a to slot b, and does not include slot a and slot b.

Note that the candidate resource that is the target of resource selection is described as Y candidate slot, but all slots in the interval [n+T ₁ , n+T ₂ ] may be candidate slots, or some slots may be candidate slots. There may be.

FIG. 20 is a diagram for explaining example (1) of communication status. As an example of the hidden terminal problem, as shown in FIG. 20, when a terminal 20B attempts to transmit to a terminal 20A, a terminal 20C that cannot be detected by the terminal 20A exists in a position that causes interference to the receiving terminal 20B. There is. For example, if the terminal 20C transmits using the time resource reserved by the terminal 20A, resource overlap will occur when the terminal 20B receives.

Furthermore, since the side link is half-duplex communication, there is a possibility that a resource conflict will occur if both terminals 20 transmit.

FIG. 21 is a diagram for explaining example (2) of communication status. As an example of the near-far problem, as shown in FIG. 21, when a terminal 20C attempts to transmit to a terminal 20A, the terminal 20B, which is detected with low power by the transmitting terminal 20C, causes large interference to the receiving terminal 20A. It may exist in the given position.

FIG. 22 is a diagram for explaining example (3) of communication status. As an example of a collision between transmission resources in the time domain, as shown in FIG. 22, the PSFCH transmission resource reserved from the terminal 20B or associated with the PSSCH, and the PSFCH transmission resource reserved from the terminal 20C or associated with the PSSCH. The transmission resources may overlap at the terminal 20A. If multiple transmissions overlap, drops or power reductions occur. For example, it is assumed that overlap between PSFCH and PSFCH shown in FIG. 20 or overlap between PSFCH and UL channel will occur.

FIG. 23 is a diagram for explaining example (4) of communication status. As an example of a collision between reception resources and transmission resources in the time domain, as shown in FIG. 23, PSSCH reception on resources reserved from terminal 20B and PSSCH transmission on resources reserved from terminal 20A are may overlap.

FIG. 24 is a diagram for explaining example (5) of communication status. As an example of collision between transmission resources and reception resources in the time domain, as shown in FIG. 24, the PSFCH associated with the PSSCH reserved from terminal 20B and the PSFCH associated with the PSSCH reserved from terminal 20A There may be overlap at 20A.

Inter-terminal cooperation is being considered as a method to improve reliability and delay performance. For example, terminal cooperation method 1 and terminal cooperation method 2 shown below are being considered. Hereinafter, the terminal 20 that transmits coordination information will be referred to as UE-A, and the terminal 20 that receives coordination information will be referred to as UE-B.

Inter-terminal cooperation method 1) For the transmission of UE-B, a preferred resource set and/or a non-preferred resource set is transmitted from UE-A to UE-B.

Inter-terminal coordination method 2) In the resource indicated by the SCI received from UE-B, the fact that collision with other transmission or reception is expected, there is a possibility of collision, or collision has been detected is notified to UE-B. A transmits to UE-B. Note that the "resource set" may be replaced with the relevant fact.

Furthermore, for example, methods related to 1) to 6) shown below may be determined regarding cooperation between terminals.

1) When and how does the terminal 20A determine the contents of the resource set? UL scheduling may also be considered.
2) When will the terminal 20A notify the resource set to the terminal 20B, and which terminal 20 will notify the resource set?
3) How to determine which terminal 20 should notify which terminal 20 of the resource set.
4) How does the terminal 20A notify the resource set? What method of notification will be used; whether to notify explicitly or implicitly.
5) When and how does terminal 20B receive or not receive the resource set? Also, when and how does the terminal 20B reflect or not reflect the received resource set in resource selection for transmission?
6) How to define or not define end-to-end cooperation support and signaling and association with cast types.

In the above inter-terminal cooperation method 1), the UE-B may perform the operations as shown in 1)-4) below.

1) UE-B's resources used for resource selection or resource reselection for transmission may be based on both UE-B's sensing results and coordination information received from UE-A. Note that this may be limited to the case where the sensing result of UE-B is available, and if the sensing result of UE-B is not available, it may be performed based only on the cooperation information received from UE-A. You can.
2) UE-B's resources used for resource selection or resource reselection for transmission may be based solely on coordination information received from UE-A.
3) UE-B's resources to be reselected may be determined based on coordination information received from UE-A.
4) UE-B's resources used for resource selection or resource reselection for transmission may be done based on coordination information received from UE-A.

In the above inter-terminal cooperation method 2), the UE-B may perform the operations as shown in 1)-2) below.

1) UE-B may determine the resources to be reselected based on cooperation information received from UE-A.
2) UE-B may decide whether retransmission is necessary based on the coordination information received from UE-A.

FIG. 25 is a sequence diagram for explaining an example of cooperation between UEs. In step S601, UE-A transmits cooperation information to UE-B. In subsequent step S602, UE-B performs a predetermined operation based on the cooperation information.

Here, the NR sidelink supports a transmission mode in which the terminal autonomously determines the resources to be used for transmission. Furthermore, a transmission mode in which a terminal autonomously determines resources to be used for transmission is also supported in LTE sidelink. In this transmission mode, terminals detect future resource usage by decoding each other's signals and operate to avoid collisions. However, the NR sidelink and the LTE sidelink are defined as different signals, and it is not possible to detect each other and avoid collision. Therefore, it has been difficult for the NR sidelink and the LTE sidelink to share resources.

FIG. 26 is a diagram for explaining an example of NR-SL and LTE-SL. As shown in FIG. 26, when resources are shared between NR-SL and LTE-SL, the NR-SL terminal 20 cannot detect the reservation signal of the LTE-SL terminal 20, It is assumed that transmissions collide using the same time and frequency resources. In order to avoid collisions, it was necessary for the network or regulator to appropriately set or predetermine settings so that LTE-SL and NR-SL use separate resources. For example, it is necessary to ensure that the resource pools of LTE and NR do not include the same time/frequency resources.

However, in decisions made by countries around the world, the resources available for cellular V2X are not abundant and only limited allocations are available. Therefore, the constraint that LTE-SL and NR-SL must use completely separate time/frequency resources is undesirable.

Therefore, a UE equipped with an NR-SL transmission/reception mechanism (hereinafter referred to as UE-B) acquires information based on the LTE-SL UE's resource reservation from another UE (hereinafter referred to as UE-A). Good too. Note that the resource reservation information of the LTE-SL UE may include the resources that the UE-A plans to transmit, and the resources may be limited to reserved resources, and the resources that are selected but not reserved. Implementation resources may also be included.

FIG. 27 is an example of information sharing in the embodiment of the present invention. In step S701, the UE-A transmits information based on the resource reservation of the LTE-SL UE to the UE-B. UE-B may receive the information from UE-A via the NR-SL signal.

The terminal 20 may perform a resource identification operation related to NR-SL resource selection based on the acquired information, as shown in A) to G) below. Note that the terminal 20 may perform a combination of A) to I). For example, the obtained information may be RSRP detected on one or more resources in LTE-SL. Note that LTE and NR may be replaced with other different RATs.

A) Immediately before or after executing resource exclusion based on resource reservation in NR-SL, the terminal 20 may execute resource exclusion based on the acquired information.

With the above operation, it is possible to perform LTE-SL resource exclusion in consideration of RSRP, similar to NR-SL resource reservation.

B) After resource exclusion based on resource reservation in NR-SL is executed, it is determined that there is a sufficient amount of candidate resources in the set of available resource candidates S _A , and the change of the RSRP threshold is completed, the obtained information is Based on this, the terminal 20 may perform resource exclusion.

Through the above operation, by determining the RSRP threshold used for resource exclusion based on the resource reservation in NR-SL, not based on the resource reservation in LTE-SL, an excessive increase in the RSRP threshold is avoided, and the resource reservation in NR-SL is Increased collisions can be avoided.

C) The value indicating the priority related to the LTE-SL reservation or PPP (ProSe Per-Packet Priority) may be treated as the same value as the value indicating the NR-SL priority, or may be treated as the same value as the value indicating the NR-SL priority. The association with the value indicating the priority may be defined, set, or set in advance.

With the above operations, it is possible to achieve simple terminal implementation or flexible settings.

D) The RSRP threshold related to resource exclusion based on LTE-SL resource reservation may be the same as the RSRP threshold related to NR-SL resource exclusion, or may be set to a different value or may be set in advance. good.

E) FIG. 28 is a diagram showing an example (1) of resource exclusion in the embodiment of this invention. As shown in FIG. 28, if at least some of the resources reserved in LTE-SL overlap with at least some of the candidate resources in NR-SL, a resource exclusion operation may be performed. It may also be applied when the SCS is different between LTE and NR. For example, when LTE-SL has SCS=15kHz and NR-SL has another SCS (for example, 30kHz), at least some symbols and /or If at least some PRBs overlap, the slot and subchannel in NR-SL may be excluded from the set _SA of usable resource candidates. Also, the times (e.g., slots) and/or frequencies (e.g., subchannels) that delimit NR-SL resources are not aligned with the times (e.g., slots) and/or frequencies (e.g., subchannels) that delimit LTE-SL resources. In case E) may be applied.

With the above operation, the resource exclusion operation can be performed even if the definition, setting, or pre-setting regarding time-frequency resources is different between LTE-SL and NR-SL.

F) FIG. 29 is a diagram showing an example (2) of resource exclusion in the embodiment of this invention. As shown in FIG. 29, when the resources reserved in LTE-SL at least partially overlap with the PSFCH resources in NR-SL, the PSCCH/PSSCH resources associated with the PSFCH are used as available resource candidates. It may be excluded from the set _SA . The priority of NR-SL may be the priority related to transmission data. That is, the priority may be determined in the same manner as the exclusion regarding overlap of PSCCH/PSSCH resources. Further, the priority of NR-SL may be set to a predetermined priority. The predetermined priority may be F) a defined, set or preset priority for operation. The NR-SL RSRP threshold may be the same value as the exclusion related to PSCCH/PSSCH resource overlap. Further, the RSRP threshold value of NR-SL may be set to a predetermined value. The predetermined value may be F) a value that is defined, set, or preset for operation.

With the above operation, it is possible to avoid a case where the corresponding PSFCH transmission/reception may fail due to LTE-SL.

G) The terminal 20 may use information acquired by a predetermined time period from the resource selection timing or the timing triggered from the upper layer. T ^SL _proc,0 (see Non-Patent Document 3), that is, a parameter related to the time from the end of the sensing window to the above timing may be applied. Further, T (see Non-Patent Document 4), that is, a parameter related to the time from acquisition of information related to simultaneous LTE-SL/NR-SL transmission to execution may be applied. Also, G) a parameter T' defined for operation may be applied.

The above operation allows the NR-SL terminal to perform resource selection without colliding with LTE-SL transmission.

Furthermore, the terminal 20 may perform operations related to NR-SL re-evaluation or preemption check based on the acquired information related to resource reservations of other terminals 20. The terminal 20 may perform any of the operations shown in A) to G) above.

With the above operation, if an LTE-SL reservation occurs after NR-SL resource selection, the NR-SL terminal can operate so as not to collide with LTE-SL transmission.

Furthermore, the terminal 20 may transmit predetermined information to the gNB 10 based on information related to resource reservations of other terminals 20. For example, the terminal 20 may perform the operations shown in a) to e) below. Note that the terminal 20 may perform a combination of a) to e). Note that the acquired information may be information based on the LTE-SL UE resource reservation received from UE-B.

a) When operating in NR resource allocation mode 1, that is, when performing SL transmission based on instructions from gNB 10, terminal 20 may transmit predetermined information to gNB 10 based on the acquired information.

b) When operating in LTE resource allocation mode 3 or 4, that is, when performing SL transmission based on instructions from the eNB 10 or when the terminal 20 autonomously determines SL transmission resources, the terminal 20 acquires Predetermined information may be transmitted to gNB 10 based on the information.

c) The terminal 20 may report the acquired information to the gNB 10. The terminal 20 may report the acquired information as CSI, upper layer information, or PUCCH or PUSCH.

d) The terminal 20 may transmit HARQ-ACK to the gNB 10 based on the acquired information. For example, the terminal 20 may perform a collision determination based on the acquired information, and transmit a NACK to the gNB 10 when determining that a collision has occurred. If the terminal 20 determines that the SL resource allocated to the gNB 10 cannot be used based on the acquired information, the terminal 20 may determine that a collision has occurred. Moreover, when the terminal 20 determines that the PSFCH resource for the resource allocated to the gNB 10 is not available based on the acquired information, the terminal 20 may determine that a collision has occurred. The above determination may be performed based on any of the operations A) to I) above. In the above determination, if the priority and/or RSRP related to the LTE-SL reservation for the SL resource allocated from the gNB 10 satisfies a predetermined condition, it may be determined that the SL resource is not available. When it is determined that there is a collision in the above determination, SL transmission using the SL resources allocated from the gNB 10 may not be performed.

e) The terminal 20 may transmit an SR (Scheduling request) to the gNB 10 based on the acquired information. For example, the terminal 20 may perform a collision determination based on the acquired information, and transmit an SR to the gNB 10 when determining that a collision has occurred. If the terminal 20 determines that the SL resource allocated to the gNB 10 cannot be used based on the acquired information, the terminal 20 may determine that a collision has occurred. Moreover, when the terminal 20 determines that the PSFCH resource for the resource allocated to the gNB 10 is not available based on the acquired information, the terminal 20 may determine that a collision has occurred. The above determination may be performed based on any of the operations A) to I) above. In the above determination, if the priority and/or RSRP related to the LTE-SL reservation for the SL resource allocated from the gNB 10 satisfies a predetermined condition, it may be determined that the SL resource is not available. When it is determined that there is a collision in the above determination, SL transmission using the SL resources allocated from the gNB 10 may not be performed. If there are no PUCCH resources for HARQ-ACK transmission in d) above, e) may be applied.

Through the above operations, network and/or UE operations can be expected to notify the network of LTE-SL reservation information and collision information between LTE-SL and NR-SL and avoid collisions.

Furthermore, the terminal 20 may perform resource selection or resource reselection in the MAC layer in NR-SL based on the acquired information regarding resource reservations of other terminals 20.

When performing resource selection or resource reselection from the _SA acquired from the PHY layer in the MAC layer, the terminal 20 may perform resource selection or resource reselection after excluding resources based on the acquired information.

For example, the _SA acquired from the PHY layer may be determined without using the acquired information, or the _SA may be determined using the same operation as in the case of only NR-SL. , the operations shown in A) to G) above may not be applied to the _SA .

For example, the S _A obtained from the PHY layer may be determined using the obtained information, or the operations shown in A) to G) above may be applied to the S _A.

"Resources based on information acquired from UE-A" may be any of the resources shown in 1)-3) below.

1) Resources that overlap with at least some of the resources reserved in LTE-SL as shown in G) above 2) At least one of the resources reserved in LTE-SL as shown in H) above 3) If the resource corresponding to the PSFCH overlaps with the PSFCH, the resource corresponding to the PSFCH is acquired by a predetermined period of time from the resource selection timing shown in G) above or the timing triggered from the upper layer. 4) If the information acquired from UE-A is a notification related to a collision in the above-mentioned inter-terminal cooperation method 2), resources related to the reservation corresponding to the notification related to the collision.

Whether the resource corresponds to the “resource based on information acquired from UE-A” (that is, whether the resource is excluded from selection targets) indicates the priority (or PPP) related to LTE-SL reservation. The determination may be based on the value and/or RSRP. Details of the priority may be defined in the same manner as in C) above.

For example, if the value indicating the priority related to LTE-SL reservation is smaller than the value indicating the priority of the data to be transmitted or the threshold value corresponding to the data to be transmitted (in other words, if the priority is high), the resource is selected. may be excluded from On the other hand, if the value indicating the priority related to LTE-SL reservation is larger than the value indicating the priority of the data to be transmitted or the threshold value corresponding to the data to be transmitted (in other words, the priority is low), the resource is selected. It does not have to be excluded from

For example, if the RSRP related to LTE-SL reservation is larger than the RSRP threshold corresponding to the value indicating the priority of data to be transmitted and/or the value indicating the priority related to LTE-SL reservation, the relevant resource may be excluded from selection. On the other hand, if the RSRP related to LTE-SL reservation is smaller than the RSRP threshold corresponding to the value indicating the priority of data to be transmitted and/or the value indicating the priority related to LTE-SL reservation, the resource does not have to be excluded from selection. Details of the RSRP threshold may be defined in the same manner as in D) above.

Additionally, when executing resource selection from S _A acquired from the PHY layer, the operation of executing resource selection after excluding resources based on the information acquired from UE-A is applied to the operation related to re-evaluation or preemption check. You may. If the already selected resource or already reserved resource, that is, the target resource for re-evaluation or preemption check, is the above-mentioned "resource based on information obtained from UE-A", request re-evaluation or preemption check to the PHY layer. Instead, it may be determined that re-evaluation or preemption is required, and resource reselection may be performed.

By operating as described above, the PHY operation can be the same as the conventional one, and the PHY configuration can be simplified. Further, the NR-SL terminal can perform resource selection so as not to collide with LTE-SL transmission.

Furthermore, when executing resource selection or resource reselection from the _SA acquired from the PHY layer, the terminal 20 may preferentially select resources other than the resources based on the information acquired from the UE-A.

For example, when executing resource selection from the S _A acquired from the PHY layer, if the terminal 20 preferentially selects a resource other than the resource based on the information acquired from the UE-A, the terminal 20 selects the resource from the S A acquired from the PHY layer as described above. When performing resource selection from the acquired _SA , the resource selection may be performed after excluding resources based on the information obtained from UE-A. Note that the operation of excluding a resource may be replaced with an operation of lowering the priority of the resource. By operating as described above, the PHY operation can be made the same as the conventional one, and the PHY configuration can be simplified.

For example, the PHY layer may report to the MAC layer both the S _A1 determined without using the information obtained from UE-A and the S _A2 determined using the information obtained from UE-A. . The MAC layer may preferentially select resources from S _A2 , and select resources from S _A1 when resources cannot be selected from S _A2 . By operating as described above, exception handling can be applied when it becomes difficult to execute NR-SL transmission using the information acquired from UE-A. NR-SL transmission can be prioritized when it would be difficult to perform NR-SL transmission using the information obtained from UE-A.

Furthermore, if a predetermined condition is met, the PHY layer may determine the S A using the information obtained from the UE-A and report it to the MAC layer, or if the predetermined condition is not met, the PHY layer may decide the S _A using the information obtained from the UE-A and report it to the MAC layer. _SA may be determined without using the information obtained from A and reported to the MAC layer. The MAC layer may select resources from the _SA reported from the PHY layer.

The predetermined condition may be that an RSRP threshold for resource exclusion in a resource allocation operation is less than or equal to a predetermined value. The RSRP threshold may be a threshold that is increased by 3 dB when the number of remaining resource candidates is less than a predetermined value in the procedure for determining _SA (see Non-Patent Document 3). That is, if the RSRP threshold is less than or equal to a predetermined value, resource identification may be performed using the information obtained from UE-A, or if the RSRP threshold exceeds a predetermined value, information obtained from UE-A may be used. Resource identification may be performed without using . Further, the RSRP threshold may be the RSRP threshold at the time when the _SA to be reported to the MAC layer is determined in the procedure for determining _{the SA} .

By operating as described above, exception handling can be applied when it becomes difficult to perform NR-SL transmission using the information acquired from UE-A. NR-SL transmission can be prioritized when it would be difficult to perform NR-SL transmission using the information obtained from UE-A.

By operating as described above, the NR-SL terminal can select resources so as not to collide with LTE-SL transmission.

Furthermore, the transmission and reception of information based on LTE-SL resource reservation may be performed based on the operation of the inter-terminal cooperation method 1) described above.

UE-B may transmit a signal requesting UE-A to transmit information based on the LTE-SL reservation. The signal may be based on the request signal in the inter-terminal cooperation method 1). In the request signal, it may be notified whether information based on LTE-SL reservation is requested.

UE-A may transmit LTE-SL reservation information to UE-B.

UE-A determines a preferred resource set and/or a non-preferred resource set based on the LTE-SL reservation information, and notifies UE-B of the resource set. You can.

In the resource determination operation of the inter-terminal cooperation method 1), the UE-A may exclude the resource corresponding to the LTE-SL reservation information from the recommended resources, or may include it among the non-recommended resources. In the resource determination operation of the inter-terminal cooperation method 1), whether or not the operation based on the LTE-SL reservation information is executed may be determined by configuration or pre-configuration, or may be determined by UE-A and/or UE-B. It may be determined based on the UE capabilities of the UE-B, it may be determined based on the request of the UE-B, or it may be determined based on the UE-A implementation.

The operation of transmitting and receiving notifications related to LTE-SL reservation information by the above-described inter-terminal cooperation method 1) may be applied to any of the embodiments described above.

Through the above-described operations, it is possible to reuse the existing mechanism and perform operations that take LTE-SL reservations into consideration. In other words, the UE configuration can be simplified.

Furthermore, the transmission and reception of information based on LTE-SL resource reservation may be performed based on the operation of the inter-terminal cooperation method 2) described above.

Based on the LTE-SL reservation, the UE-A may detect a resource collision regarding the reserved resources of the UE-B, and may transmit a notification regarding the collision to the UE-B.

UE-A received a resource reservation signal from a certain NR-UE and an LTE-SL signal for reserving a resource that overlaps in the time domain or in the time domain and frequency domain with the resource reserved by the resource reservation signal. In this case, the NR-UE may be determined as the UE-B that sends the notification regarding the collision. Regardless of the priority of the resource reservation signal and/or LTE-SL, the UE-A may determine the NR-UE to be the UE-B. If the NR-UE supports PSFCH reception in the terminal cooperation method 2), UE-A only supports becoming the UE-B in the terminal cooperation method 2). It may be determined to be UE-B.

When UE-A receives a resource reservation signal from UE-B and an LTE-SL signal that reserves a resource that overlaps in the time domain or in the time domain and frequency domain with the resource reserved by the resource reservation signal, , it may be determined that a resource conflict has been detected based on at least one of the RSRP of the resource reservation signal and the LTE-SL signal, the priority, and a set or preset threshold.

The conditions for resource collision detection are the overlap between NR-SL resource reservations (that is, intra-RAT) and the overlap between NR-SL resource reservations and LTE-SL resource reservations, even if they are the same. It's okay and it can be different. If they are the same, the UE configuration can be simplified. If the resource reservations are different, it is possible to flexibly set how much priority is given to LTE-SL reservations over NR-SL resource reservations.

The above-described or preset thresholds for detecting resource collisions between the NR-SL resource reservation signal and the LTE-SL resource reservation signal may be the same or different. If they are the same, the UE configuration can be simplified. If the resource reservations are different, it is possible to flexibly set how much priority is given to LTE-SL reservations over NR-SL resource reservations.

The PSFCH resources (e.g., PSFCH opportunities, PRBs, cyclic shifts) used for sending collision notifications are based on the overlap between NR-SL resource reservations (i.e., intra-RAT) and the overlap between NR-SL resource reservations and LTE. - The overlap between the resource reservations of the SLs, which may be the same or different. If they are the same, the UE configuration can be simplified. If the information is different, the UE-B can be notified whether the information is based on LTE-SL reservations or not.

In the operation of the inter-terminal cooperation method 2), whether or not the operation based on the LTE-SL reservation information is executed may be determined by the settings or advance settings, or may be determined by the settings of the UE-A and/or the UE-B. It may be determined based on the UE capabilities or may be determined by the UE-A implementation.

The operation of transmitting and receiving a notification regarding a collision based on LTE-SL reservation information by the above-described inter-terminal cooperation method 2) may be applied to any of the embodiments described above.

Through the above-described operations, it is possible to reuse the existing mechanism to perform operations that take LTE-SL reservations into consideration, and it is possible to simplify the UE configuration.

The above embodiments are not limited to the coexistence or cooperative operation of LTE-SL and NR-SL, but may be applied to the coexistence or cooperative operation of multiple RATs.

In the above-described embodiment, the operation in which the NR-SL side considers the reservation on the LTE-SL side is illustrated, but the operation in the opposite direction may be performed on the LTE-SL side in which the reservation on the NR-SL side is considered. However, operations may be performed to consider reservations in both directions. Furthermore, in the above-described embodiment, the UE-B may perform an operation by understanding whether the information received from the UE-A is information determined based on the LTE-SL reservation. The action may be performed without any action. UE-A may notify UE-B whether the information is determined based on the LTE-SL reservation.

The above embodiments are not limited to V2X terminals, but may be applied to terminals that perform D2D communication.

The operations according to the embodiments described above may be performed only in a specific resource pool. For example, it may be executed only in resource pools in which terminals 20 of release 17 or later can be used.

According to the above-described embodiment, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource identification in NR-SL, thereby improving the reliability of resource selection and improving the reliability of resource selection between LTE-SL and NR-SL. resources can be shared.

That is, resources can be shared between direct communication between terminals that use different RATs (Radio Access Technologies).

(Device configuration)
Next, an example of the functional configuration of the base station 10 and terminal 20 that execute the processes and operations described above will be described. Base station 10 and terminal 20 include functionality to implement the embodiments described above. However, the base station 10 and the terminal 20 may each have only some of the functions in the embodiment.

<Base station 10>
FIG. 30 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 30, base station 10 includes a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 30 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

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

The setting unit 130 stores preset setting information and various setting information to be sent to the terminal 20 in a storage device, and reads them from the storage device as necessary. The content of the setting information is, for example, information related to the setting of D2D communication.

As described in the embodiment, the control unit 140 performs processing related to settings for the terminal 20 to perform D2D communication. Further, the control unit 140 transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmitting unit 110. Further, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the reception unit 120. A functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and a functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

<Terminal 20>
FIG. 31 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 31, the terminal 20 includes a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 31 is only an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and functional parts may have any names.

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

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

As described in the embodiment, the control unit 240 controls D2D communication to establish an RRC connection with another terminal 20. Further, the control unit 240 performs processing related to power saving operation. Further, the control unit 240 performs processing related to HARQ for D2D communication and DL communication. Further, the control unit 240 transmits to the base station 10 information related to HARQ responses for D2D communication and DL communication scheduled from the base station 10 to other terminals 20. Further, the control unit 240 may schedule D2D communication for other terminals 20. Further, the control unit 240 may autonomously select a resource to be used for D2D communication from the resource selection window based on the sensing result, or may perform re-evaluation or preemption. Further, the control unit 240 performs processing related to power saving in transmission and reception of D2D communication. Further, the control unit 240 performs processing related to cooperation between terminals in D2D communication. A functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

(Hardware configuration)
The block diagrams (FIGS. 30 and 31) used to explain the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 32 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are 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. Good too.

Note that in the following description, the word "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured not to include some of the devices.

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

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be implemented by the processor 1001.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes in accordance with these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 30 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 31 may be realized by a control program stored in the storage device 1002 and operated on the processor 1001. Although the various processes described above have been described as being executed by one processor 1001, they may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The storage device 1002 is a computer-readable recording medium, such as at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may be called a register, cache, main memory, or the like. The storage device 1002 can store executable programs (program codes), software modules, and the like to implement a communication method according to an embodiment of the present disclosure.

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

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc., for example. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of. For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission line interface, etc. may be realized by the communication device 1004. The transmitting and receiving unit may be physically or logically separated into a transmitting unit and a receiving unit.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

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

FIG. 33 shows an example of the configuration of the vehicle 2001. As shown in FIG. 33, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, a front wheel 2007, a rear wheel 2008, an axle 2009, an electronic control unit 2010, and various sensors 2021 to 2029. , an information service section 2012 and a communication module 2013. Each aspect/embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, may be applied to communication module 2013.

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

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

Signals from various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the motor current, a front wheel and rear wheel rotation speed signal obtained by a rotation speed sensor 2022, and a front wheel rotation speed signal obtained by an air pressure sensor 2023. and rear wheel air pressure signals, vehicle speed signals acquired by vehicle speed sensor 2024, acceleration signals acquired by acceleration sensor 2025, accelerator pedal depression amount signals acquired by accelerator pedal sensor 2029, and brake pedal sensor 2026. These include a brake pedal depression amount signal, a shift lever operation signal acquired by the shift lever sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028, and the like.

The information service department 2012 controls various devices such as car navigation systems, audio systems, speakers, televisions, and radios that provide (output) various information such as driving information, traffic information, and entertainment information, and these devices. It is composed of one or more ECUs. The information service unit 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from an external device via the communication module 2013 and the like. The information service department 2012 may include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, etc.) that accepts input from the outside, and an output device that performs output to the outside (for example, display, speaker, LED lamp, touch panel, etc.).

The driving support system unit 2030 includes a millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioning locator (for example, GNSS, etc.), map information (for example, a high-definition (HD) map, an autonomous vehicle (AV) map, etc.) ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors that prevent accidents and reduce the driver's driving burden. The system is comprised of various devices that provide functions for the purpose and one or more ECUs that control these devices. Further, the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.

Communication module 2013 can communicate with microprocessor 2031 and components of vehicle 2001 via a communication port. For example, the communication module 2013 communicates with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, electronic Data is transmitted and received between the microprocessor 2031, memory (ROM, RAM) 2032, and sensors 2021 to 29 in the control unit 2010.

The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, various information is transmitted and received with an external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

The communication module 2013 receives signals from the various sensors 2021 to 2028 described above that are input to the electronic control unit 2010, information obtained based on the signals, and input from the outside (user) obtained via the information service unit 2012. At least one of the information based on the information may be transmitted to an external device via wireless communication. The electronic control unit 2010, various sensors 2021-2028, information service unit 2012, etc. may be called an input unit that receives input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 2012 provided in the vehicle 2001. The information service unit 2012 is an output unit that outputs information (for example, outputs information to devices such as a display and a speaker based on the PDSCH (or data/information decoded from the PDSCH) received by the communication module 2013). may be called. Communication module 2013 also stores various information received from external devices into memory 2032 that can be used by microprocessor 2031 . Based on the information stored in the memory 2032, the microprocessor 2031 controls the drive section 2002, steering section 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheel 2007, rear wheel 2008, and axle 2009 provided in the vehicle 2001. , sensors 2021 to 2029, etc. may be controlled.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, a first RAT (Radio Access Technology) includes a communication unit that executes transmission and reception, and a control unit that controls communication in the first RAT. The communication unit receives information from another terminal indicating that the resource reservation in the first RAT and the resource reservation in the second RAT conflict at least in the time domain, and the control unit At least one of the determination operation of the usable resource set in the first RAT layer and the resource selection operation from the resource set in the MAC (Medium Access Control) layer is performed based on the information indicating the conflict. A terminal is provided in which the communication unit performs transmission to another terminal using the resource selected by the resource selection operation.

With the above configuration, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource identification in NR-SL, thereby improving the reliability of resource selection and improving the reliability of resource selection between LTE-SL and NR-SL. Resources can be shared. That is, resources can be shared between direct communication between terminals using different RATs (Radio Access Technologies).

The control unit may exclude resources from the resource set based on the information indicating the collision in the MAC layer. With this configuration, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource exclusion in NR-SL, thereby improving the reliability of resource selection and reserving resources in LTE-SL and NR-SL. can be shared.

The communication unit may report information indicating the collision to the base station. With this configuration, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource exclusion in NR-SL, thereby improving the reliability of resource selection and reserving resources in LTE-SL and NR-SL. can be shared.

The communication unit may transmit a signal requesting information indicating the collision to the other terminal. With this configuration, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource exclusion in NR-SL, thereby improving the reliability of resource selection and reserving resources in LTE-SL and NR-SL. can be shared.

The control unit may assume that the resource that receives the information indicating the collision is different from the resource that receives the information related to the resource collision in the first RAT. With this configuration, the terminal 20 acquires resource reservation information in LTE-SL and applies it to resource exclusion in NR-SL, thereby improving the reliability of resource selection and reserving resources in LTE-SL and NR-SL. can be shared.

Further, according to an embodiment of the present invention, a communication procedure for performing transmission and reception in a first RAT (Radio Access Technology), a control procedure for controlling communication in the first RAT, and a A procedure for receiving information from another terminal indicating that a resource reservation and a resource reservation in a second RAT collide at least in the time domain; and determining a usable resource set in the first RAT in a physical layer. and a procedure for executing at least one of a resource selection operation from the resource set in a MAC (Medium Access Control) layer based on the information indicating the conflict, and a resource selected by the resource selection operation. A communication method is provided in which a terminal performs a procedure for performing transmission to another terminal using a method.

(Supplementary information on the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, modifications, alternatives, replacements, etc. Probably. Although the invention has been explained using specific numerical examples to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The classification of items in the above explanation is not essential to the present invention, and matters described in two or more items may be used in combination as necessary, and matters described in one item may be used in another item. may be applied to the matters described in (unless inconsistent). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional sections may be physically performed by one component, or the operations of one functional section may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of process description, such devices may be implemented in hardware, software, or a combination thereof. Software operated by the processor included in the base station 10 according to the embodiment of the present invention and software operated by the processor included in the terminal 20 according to the embodiment of the present invention are respectively random access memory (RAM), flash memory, and read-only memory. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

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

Each aspect/embodiment described in this disclosure is LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system). system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is an integer or decimal number, for example)), FRA (Future Radio Access), NR (new Radio), New radio access ( NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802 Systems that utilize .16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other appropriate systems, and that are extended, modified, created, and defined based on these. The present invention may be applied to at least one of the next generation systems. Furthermore, a combination of a plurality of systems may be applied (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

In this specification, specific operations performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes including a base station 10, various operations performed for communication with a terminal 20 are performed by the base station 10 and other network nodes other than the base station 10. It is clear that this can be done by at least one of the following: for example, MME or S-GW (possible, but not limited to). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of multiple other network nodes (for example, MME and S-GW). .

The information, signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

The input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information etc. to be input/output may be overwritten, updated, or additionally written. The output information etc. may be deleted. The input information etc. may be transmitted to other devices.

The determination in the present disclosure may be performed based on a value represented by 1 bit (0 or 1), a truth value (Boolean: true or false), or a comparison of numerical values (e.g. , comparison with a predetermined value).

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create a website, When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

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

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

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters mentioned above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements may be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

In this disclosure, "Base Station (BS)," "wireless base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," and "gNodeB ( gNB)”, “access point”, “transmission point”, “reception point”, “transmission/reception point”, “cell”, “sector”, Terms such as "cell group," "carrier," "component carrier," and the like may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells. If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (RRHs)). Communication services can also be provided by Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In the present disclosure, the base station transmitting information to the terminal may be read as the base station instructing the terminal to control/operate based on the information.

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

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

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body refers to a movable object, and the moving speed is arbitrary. Naturally, this also includes cases where the moving object is stopped. The mobile objects include, for example, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, carts, rickshaws, ships and other watercraft. , including, but not limited to, airplanes, rockets, artificial satellites, drones (registered trademarks), multicopters, quadcopters, balloons, and objects mounted thereon. Furthermore, the mobile object may be a mobile object that autonomously travels based on a travel command. It may be a vehicle (e.g. car, airplane, etc.), an unmanned moving object (e.g. drone, self-driving car, etc.), or a robot (manned or unmanned). good. Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Additionally, the base station in the present disclosure may be replaced by a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the terminal 20 may have the functions that the base station 10 described above has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station may have the functions that the user terminal described above has.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

The terms "connected", "coupled", or any variations thereof, refer to any connection or coupling, direct or indirect, between two or more elements and to each other. It may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements may include one or more wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges, and the like.

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

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

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed or that the first element must precede the second element in any way.

"Means" in the configurations of each of the above devices may be replaced with "unit", "circuit", "device", etc.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe. A subframe may also be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to the transmission and/or reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, and transmitter/receiver. It may also indicate at least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transceiver in the time domain, and the like.

A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a unit of time based on numerology.

A slot may include multiple mini-slots. Each minislot may be made up of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. It's okay. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit of scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI that is shorter than the normal TTI may be referred to as an abbreviated TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

Note that long TTI (for example, normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1 ms, and short TTI (for example, short TTI, etc.) It may also be read as a TTI having the above TTI length.

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

Additionally, the time domain of an RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs include physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc. May be called.

Additionally, a resource block may be configured by one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A bandwidth part (BWP) (which may also be called a partial bandwidth or the like) may represent a subset of consecutive common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

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

At least one of the configured BWPs may be active, and the terminal 20 does not need to assume that it transmits or receives a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

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

In this disclosure, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Although the present disclosure has been described in detail above, it is clear for those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

This international patent application claims priority based on Japanese Patent Application No. 2022-078446 filed on May 11, 2022, and the entire content of Japanese Patent Application No. 2022-078446 is incorporated into this application. I will use it.

10 Base station 110 Transmitting section 120 Receiving section 130 Setting section 140 Control section 20 Terminal 210 Transmitting section 220 Receiving section 230 Setting section 240 Control section 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Driving part 2003 Restoration Part 2004 Axel Pedal 2005 Brake Pedal 2006 Shift Lever 2007 Front wheels 2008 Bearing 2009 Axis 2010 Electronic Control Division 2012 Electronic Control Division 20133 Communication Modular 2021 Current sensor 2022 Round Sensor 2023 Air pressure sensor 2024 vehicle speed Sensen Sa 2025 acceleration sensor 2026 brake Pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 Communication port (IO port)

Claims

a communication unit that executes transmission and reception in a first RAT (Radio Access Technology);
a control unit that controls communication in the first RAT;
The communication unit receives information from another terminal indicating that a resource reservation in the first RAT and a resource reservation in the second RAT conflict at least in the time domain,
The control unit performs at least one of an operation for determining an available resource set in the first RAT in a physical layer and an operation for selecting resources from the resource set in a MAC (Medium Access Control) layer. perform based on information indicating that
The communication unit is a terminal that executes transmission to another terminal using the resource selected by the resource selection operation.
The terminal according to claim 1, wherein the control unit executes resource exclusion from the resource set based on the information indicating the collision in the MAC layer.
The terminal according to claim 1, wherein the communication unit reports information indicating the collision to a base station.
The terminal according to claim 1, wherein the communication unit transmits a signal requesting information indicating the collision to the other terminal.
The terminal according to claim 1, wherein the control unit assumes that the resource for receiving the information indicating the collision is different from the resource for receiving the information regarding the resource conflict in the first RAT.
A communication procedure for performing transmission and reception in a first RAT (Radio Access Technology);
a control procedure for controlling communication in the first RAT;
receiving information from another terminal indicating that the resource reservation in the first RAT and the resource reservation in the second RAT conflict at least in the time domain;
Information indicating that at least one of an operation for determining an available resource set in the first RAT in a physical layer and an operation for selecting resources from the resource set in a MAC (Medium Access Control) layer will conflict with each other. the steps to be taken based on;
A communication method in which a terminal executes a procedure of transmitting to another terminal using the resource selected by the resource selection operation.