Terminal and communication method

Abstract

A terminal has a reception section that receives information related to resource reservation in a monitoring window, a control section that excludes resources from a set of resource candidates based on a RSRP (Reference Signal Received Power) at the time of reception of the information related to resource reservation and a priority included in the information related to resource reservation, selects resources used in transmission from the set of resource candidates after the exclusion, and a transmission section that transmits to other terminals using the selected resources, the control section further excluding resources from the set of resource candidates or selecting resources used in transmission from the set of resource candidates after the exclusion based on information related to uplink transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal in a wireless communication system and a communication method. BACKGROUND

[0002] In LTE (Long Term Evolution) and a successor system of LTE (for example, LTE-A (LTE-Advanced), NR (New Radio) (also referred to as 5G)), a D2D (Device to Device) technology in which terminals directly communicate without going through a base station is being researched (for example, Non-Patent Literature 1).

[0003] D2D reduces traffic between terminals and a base station, and enables communication between terminals even in a case where the base station cannot communicate in a disaster or the like. In 3GPP (3rd Generation Partnership Project), D2D is referred to as “sidelink”, but in the present specification, the more general term, D2D, is used. However, in the description of the embodiments described later, sidelink is also used as needed.

[0004] D2D communication is roughly classified into D2D discovery (also referred to as D2D discovery) for discovering other terminals with which communication can be performed, and D2D communication (also referred to as D2D direct communication, D2D communication, inter-terminal direct communication, and the like) for directly communicating between terminals. Hereinafter, when D2D communication (D2D communication), D2D discovery (D2D discovery), and the like are not particularly distinguished, D2D is simply referred to. Furthermore, a signal that is transmitted and received by D2D is referred to as a D2D signal. Various use cases of services related to V2X (Vehicle to Everything) in NR are being researched (for example, Non-Patent Literature 2).

[0005] PRIOR ART DOCUMENTS

[0006] NON-PATENT LITERATURE

[0007] Non-Patent Literature 1: 3GPP TS 38.211 V16.2.0 (2020-06)

[0008] Non-Patent Literature 2: 3GPP TR 22.886 V15.1.0 (2017-03) SUMMARY

[0009] PROBLEMS TO BE SOLVED BY THE INVENTION

[0010] As an enhancement of NR sidelink, power saving is being studied. For example, in resource allocation mode 2 in which a terminal autonomously selects a resource, the terminal performs partial sensing for a limited resource within a monitoring window, and selects a resource candidate that can be used from a resource selection window according to the result.

[0011] Here, in resource allocation mode 2, in a case where a sidelink transmission and an uplink transmission overlap in the time domain, although processing related to dropping or even transmission power limitation is performed according to the priority of each transmission, the reliability or delay performance of the sidelink transmission can decrease.

[0012] The present application was made in view of the above, and aims to improve the reliability of communication at the time of autonomous resource selection in inter-terminal direct communication.

[0013] Means for solving the problem

[0014] According to the disclosed technology, a terminal is provided that has: a reception section that receives information related to resource reservation in a monitoring window; a control section that excludes a resource from a set of resource candidates according to a RSRP (Reference Signal Received Power) at the time of reception of the information related to resource reservation and a priority included in the information related to resource reservation, and selects a resource used in transmission from the set of resource candidates after the exclusion; and a transmission section that transmits to another terminal using the selected resource, the control section further excluding a resource from the set of resource candidates or selecting a resource used in transmission from the set of resource candidates after the exclusion according to information related to uplink transmission.

[0015] Effects of the Invention

[0016] According to the disclosed technology, in inter-terminal direct communication, the reliability of communication at the time of autonomous resource selection can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a diagram for explaining V2X.

[0018] Figure 2 is a diagram for explaining example (1) of a transmission mode of V2X.

[0019] Figure 3 is a diagram for explaining example (2) of a transmission mode of V2X.

[0020] Figure 4FIG. 5 is a diagram for explaining an example (3) of a transmission mode of V2X.

[0021] Figure 5 FIG. 6 is a diagram for explaining an example (4) of a transmission mode of V2X.

[0022] Figure 6 FIG. 7 is a diagram for explaining an example (5) of a transmission mode of V2X.

[0023] Figure 7 FIG. 8 is a diagram for explaining an example (1) of a communication type of V2X.

[0024] Figure 8 FIG. 9 is a diagram for explaining an example (2) of a communication type of V2X.

[0025] Figure 9 FIG. 10 is a diagram for explaining an example (3) of a communication type of V2X.

[0026] Figure 10 FIG. 11 is a timing chart showing an action example (1) of V2X.

[0027] Figure 11 FIG. 12 is a timing chart showing an action example (2) of V2X.

[0028] Figure 12 FIG. 13 is a timing chart showing an action example (3) of V2X.

[0029] Figure 13 FIG. 14 is a timing chart showing an action example (4) of V2X.

[0030] Figure 14 FIG. 15 is a diagram showing an example of a monitoring action.

[0031] Figure 15 FIG. 16 is a flowchart for explaining an example of a preemption action.

[0032] Figure 16 FIG. 17 is a diagram showing an example of a preemption action.

[0033] Figure 17 FIG. 18 is a diagram showing an example (1) of a communication situation in the embodiment of the present application.

[0034] Figure 18 FIG. 19 is a diagram showing an example (2) of a communication situation in the embodiment of the present application.

[0035] Figure 19 FIG. 20 is a diagram showing an example (3) of a communication situation in the embodiment of the present application.

[0036] Figure 20 FIG. 21 is a diagram showing an example of resource allocation in the embodiment of the present application.

[0037] Figure 21 is a flowchart for explaining Example (1) of resource selection in the embodiment of the present application.

[0038] Figure 22 is a flowchart for explaining Example (2) of resource selection in the embodiment of the present application.

[0039] Figure 23 is a flowchart for explaining Example (3) of resource selection in the embodiment of the present application.

[0040] Figure 24 is a flowchart for explaining Example (4) of resource selection in the embodiment of the present application.

[0041] Figure 25 is a diagram showing an example of a functional structure of the base station 10 in the embodiment of the present application.

[0042] Figure 26 is a diagram showing an example of a functional structure of the terminal 20 in the embodiment of the present application.

[0043] Figure 27 is a diagram showing an example of a hardware structure of the base station 10 or the terminal 20 in the embodiment of the present application. DETAILED DESCRIPTION

[0044] Hereinafter, an embodiment of the present application will be described with reference to the drawings. Note that the following embodiment is merely an example, and the embodiment of the present application is not limited to the following embodiment.

[0045] In the wireless communication system of the embodiment of the present application, a conventional technology is appropriately used. However, the conventional technology is, for example, the existing LTE, but is not limited to the existing LTE. Further, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and a mode after LTE-Advanced (for example, NR) or a wireless LAN (Local Area Network) in addition to the existing LTE.

[0046] Further, in the embodiment of the present application, a duplex mode can be a TDD (Time Division Duplex) mode, can be an FDD (Frequency Division Duplex) mode, or can be a mode other than these (for example, a flexible duplex, etc.).

[0047] Further, in the embodiment of the present application, the "Configure" wireless parameters and the like can be pre-configured with predetermined values, or can be configured with wireless parameters notified from the base station 10 or the terminal 20.

[0048] Figure 1 is a diagram for explaining V2X. In 3GPP, a technology for realizing V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending the D2D function is being studied, and standardization is being promoted. As shown in Figure 1 V2X is a part of ITS (Intelligent Transport Systems), and is a general term of V2V (Vehicle to Vehicle) indicating a form of communication between vehicles, V2I (Vehicle to Infrastructure) indicating a form of communication between a vehicle and a road-side device (RSU: Road-Side Unit) provided on the side of a road, V2N (Vehicle to Network) indicating a form of communication between a vehicle and an ITS server, and V2P (Vehicle to Pedestrian) indicating a form of communication between a vehicle and a mobile terminal held by a pedestrian.

[0049] Further, in 3GPP, V2X using cellular communication and inter-terminal communication of LTE or NR is being studied. V2X using cellular communication is also referred to as cellular V2X. In V2X of NR, research for realizing large capacity, low latency, high reliability, and QoS (Quality of Service) control is being promoted.

[0050] With respect to V2X of LTE or NR, it is envisaged that research not limited to 3GPP specifications will be promoted in the future. For example, it is envisaged that research for ensuring interoperability, reducing costs due to installation of higher layers, a method for using or switching multiple RATs (Radio Access Technologies), support of regulations of each country, data acquisition, distribution, database management, and usage methods of a V2X platform of LTE or NR will be conducted.

[0051] In the embodiment of the present application, a mode in which the communication device is mounted on a vehicle is mainly assumed, but the embodiment of the present application is not limited to this mode. For example, the communication device can be a terminal held by a person, the communication device can also be a device mounted on a drone or an aircraft, the communication device can also be a base station, an RSU, a relay node, a terminal having a scheduling capability, and the like.

[0052] In addition, SL (Sidelink) can also be distinguished according to UL (Uplink) or DL (Downlink) and any one or combination of 1) to 4) described below. In addition, SL can also be other names.

[0053] 1) Resource configuration in time domain

[0054] 2) Resource configuration in frequency domain

[0055] 3) Reference of synchronization signal (including SLSS (Sidelink Synchronization Signal))

[0056] 4) Reference signal used in path loss measurement for transmission power control

[0057] In addition, with respect to OFDM (Orthogonal Frequency Division Multiplexing) of SL or UL, any one of CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), OFDM without transform precoding, or OFDM with transform precoding can also be adopted.

[0058] In SL of LTE, with respect to resource allocation of SL to the terminal 20, Mode 3 and Mode 4 are specified. In Mode 3, transmission resources are dynamically allocated using DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20. In addition, in Mode 3, SPS (Semi-Persistent Scheduling) can also be performed. In Mode 4, the terminal 20 autonomously selects transmission resources from a resource pool.

[0059] In addition, the slot in the embodiment of the present application can be replaced with a symbol, a mini-slot, a subframe, a radio frame, a TTI (Transmission Time Interval), and the like. Furthermore, the cell in the embodiment of the present application can be replaced with a cell group, a carrier component, a BWP, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), and the like.

[0060] In addition, in the embodiment of the present application, the terminal 20 is not limited to a V2X terminal, and can be a terminal of all kinds that performs D2D communication. For example, the terminal 20 can be a terminal held by a user such as a smartphone, and can be an IoT (Internet of Things) device such as a smart meter.

[0061] Figure 2 is a diagram for explaining example (1) of a transmission mode of V2X. In Figure 2 The transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, Uu-based sidelink scheduling is performed. Uu refers to a radio interface between a UTRAN (Universal Terrestrial Radio Access Network) and a UE (User Equipment). In addition, the transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 1 in NR. Figure 2 The transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, Uu-based sidelink scheduling is performed. Uu refers to a radio interface between a UTRAN (Universal Terrestrial Radio Access Network) and a UE (User Equipment). In addition, the transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 1 in NR. Figure 2 The transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, Uu-based sidelink scheduling is performed. Uu refers to a radio interface between a UTRAN (Universal Terrestrial Radio Access Network) and a UE (User Equipment). In addition, the transmission mode of sidelink communication illustrated in FIG. 13 can be called sidelink transmission mode 1 in NR.

[0062] Figure 3 is a diagram for explaining example (2) of a transmission mode of V2X. In Figure 3 The transmission mode of sidelink communication illustrated in FIG. 14 can be called sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, a UE itself performs resource selection. Figure 3 The transmission mode of sidelink communication illustrated in FIG. 14 can be called sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, a UE itself performs resource selection.

[0063] Figure 4 is a diagram for explaining example (3) of a transmission mode of V2X. In Figure 4 the transmission mode of sidelink communication shown in FIG. 13, in step 1, the terminal 20A transmits PSCCH and PSSCH to the terminal 20B using a resource autonomously selected. Likewise, the terminal 20B transmits PSCCH and PSSCH to the terminal 20A using a resource autonomously selected (step 1). The transmission mode of sidelink communication shown in FIG. 13 can be referred to as sidelink transmission mode 2a in NR. Figure 4

[0064] Figure 5 is a diagram for explaining example (4) of a transmission mode of V2X. In Figure 5 the transmission mode of sidelink communication shown in FIG. 14, in step 0, a resource mode of sidelink is set to be transmitted to the terminal 20A from the base station 10 via RRC (Radio Resource Control), or is set in advance. Next, the terminal 20A transmits PSSCH to the terminal 20B according to the resource mode (step 1). The transmission mode of sidelink communication shown in FIG. 14 can be referred to as sidelink transmission mode 2c in NR. Figure 5

[0065] Figure 6 is a diagram for explaining example (5) of a transmission mode of V2X. In Figure 6 the transmission mode of sidelink communication shown in FIG. 15, in step 1, the terminal 20A transmits scheduling information of sidelink to the terminal 20B via PSCCH. Next, the terminal 20B transmits PSSCH to the terminal 20A according to the received scheduling information (step 2). The transmission mode of sidelink communication shown in FIG. 15 can be referred to as sidelink transmission mode 2d in NR. Figure 6

[0066] Figure 7 is a diagram for explaining example (1) of a communication type of V2X. Figure 7 The communication type of sidelink shown in FIG. 16 is unicast. The terminal 20A transmits PSCCH and PSSCH to the terminal 20. In Figure 7 the example shown in FIG. 16, the terminal 20A unicasts to the terminal 20B and unicasts to the terminal 20C.

[0067] Figure 8 is a diagram for explaining example (2) of a communication type of V2X. Figure 8 The communication type of sidelink shown in FIG. 17 is groupcast. The terminal 20A transmits PSCCH and PSSCH to a group to which one or a plurality of terminals 20 belong. In Figure 8 ​​​In the example shown, the group includes the terminal 20B and the terminal 20C, and the terminal 20A multicasts to the group.

[0068] Figure 9 is a diagram for explaining example (3) of the communication type of V2X. Figure 9 The communication type of the sidelink shown is broadcast. The terminal 20A transmits the PSCCH and the PSSCH to one or a plurality of terminals 20. In this case, the terminal 20A transmits the PSCCH and the PSSCH to the terminal 20B and the terminal 20C. Figure 9 In the example shown, the terminal 20A broadcasts to the terminal 20B, the terminal 20C, and the terminal 20D. In addition, the terminal 20A can also broadcast to the terminal 20B and the terminal 20C. Figures 7-9 The terminal 20A shown is referred to as a header-UE.

[0069] Further, in NR-V2X, it is assumed that HARQ (Hybrid automatic repeat request) is supported in unicast and groupcast of the sidelink. Also, in NR-V2X, SFCI (Sidelink Feedback Control Information) including HARQ-ACK is defined. Also, it is being studied that the SFCI is transmitted via PSFCH (Physical Sidelink Feedback Channel).

[0070] In addition, in the following description, it is assumed that the PSFCH is used in the transmission of HARQ-ACK in the sidelink, but this is only an example. For example, the transmission of HARQ-ACK in the sidelink can be performed using the PSCCH, the transmission of HARQ-ACK in the sidelink can be performed using the PSSCH, and the transmission of HARQ-ACK in the sidelink can be performed using another channel.

[0071] Hereinafter, for the convenience of explanation, all the information reported by the terminal 20 in HARQ will be referred to as HARQ-ACK. The HARQ-ACK can also be referred to as HARQ-ACK information. Further, more specifically, the codebook applied to the information of the HARQ-ACK reported from the terminal 20 to the base station 10 or the like will be referred to as a HARQ-ACK codebook. The HARQ-ACK codebook specifies a bit string of the HARQ-ACK information. In addition, with "HARQ-ACK", NACK is also transmitted in addition to ACK.

[0072] Figure 10 is a timing chart showing an action example (1) of V2X. As Figure 10As shown, the wireless communication system of the embodiment of the present application can have a terminal 20A and a terminal 20B. In addition, there are actually a plurality of user devices, but as an example, Figure 10 The terminal 20A and the terminal 20B are shown.

[0073] Hereinafter, without particularly distinguishing the terminal 20A, 20B, etc., only "terminal 20" or "user device" is written. In Figure 10 In the present embodiment, as an example, a case where both the terminal 20A and the terminal 20B are within the coverage of a cell is shown, but the operation in the present embodiment can also be applied to a case where the terminal 20B is outside the coverage.

[0074] As described above, in the present embodiment, the terminal 20 is, for example, a device mounted on a vehicle such as a car, and has a function of cellular communication as a UE in LTE or NR and a sidelink function. The terminal 20 can also be a general portable terminal (smartphone, etc.). In addition, the terminal 20 can also be an RSU. This RSU can be a UE type RSU (UE type RSU) having the function of a UE, or a gNB type RSU (gNB type RSU) having the function of a base station device.

[0075] In addition, the terminal 20 does not need to be a device of one housing, and for example, even in a case where various sensors are dispersedly arranged in a vehicle, a device including the various sensors can be the terminal 20.

[0076] In addition, the processing content of the transmission data of the sidelink of the terminal 20 is basically the same as that of the UL transmission in LTE or NR. For example, the terminal 20 scrambles the codeword of the transmission data, performs modulation to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to layer 1 or layer 2, and performs precoding. Then, the precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (for example, complex-valued time-domain SC-FDMA signal), and are transmitted from each antenna port.

[0077] In addition, with respect to the base station 10, it has a function of cellular communication as a base station in LTE or NR, and a function for enabling the terminal 20 in the present embodiment to communicate (for example, resource pool setting, resource allocation, etc.). In addition, the base station 10 can also be an RSU (gNB type RSU).

[0078] Further, in the wireless communication system of the embodiment of the present application, the signal waveform used by the terminal 20 in the SL or the UL can be OFDMA, can be SC-FDMA, or can be another signal waveform.

[0079] In step S101, the terminal 20A autonomously selects resources used in the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window can also be set to the terminal 20 by the base station 10. Here, the predetermined period of the resource selection window can be determined in accordance with a processing time or a packet maximum allowable delay time, which is a terminal installation condition, can be predetermined in accordance with a specification, or can be referred to as an interval in the time domain.

[0080] In steps S102 and S103, the terminal 20A transmits SCI (Sidelink Control Information) using the PSCCH and / or the PSSCH and transmits SL data using the PSSCH using the resources autonomously selected in step S101. For example, the terminal 20A can transmit the PSCCH using frequency resources adjacent to the frequency resources of the PSSCH in the same time resources as at least a part of the time resources of the PSSCH.

[0081] The terminal 20B receives the SCI (PSCCH and / or PSSCH) and the SL data (PSSCH) transmitted from the terminal 20A. In the received SCI, information of the resources of the PSFCH for the terminal 20B to transmit a HARQ-ACK for the reception of the data can be included. The terminal 20A can include information of the autonomously selected resources in the SCI and transmit the same.

[0082] In step S104, the terminal 20B transmits a HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH determined from the received SCI.

[0083] When the HARQ-ACK received in step S104 is a NACK (negative acknowledgement) indicating a case where retransmission is requested, the terminal 20A retransmits the PSCCH and the PSSCH to the terminal 20B in step S105. The terminal 20A can retransmit the PSCCH and the PSSCH using the autonomously selected resources.

[0084] In addition, steps S104 and S105 can not be performed in a case where HARQ control accompanied by HARQ feedback is not performed.

[0085] Figure 11is a timing chart illustrating an action example (2) of V2X. Blind retransmission that is not related to HARQ control for improving the success rate or the arrival distance of transmission can also be performed.

[0086] In step S201, the terminal 20A autonomously selects resources used in PSCCH and PSSCH from a resource selection window having a predetermined period. The resource selection window can also be set to the terminal 20 by the base station 10.

[0087] In steps S202 and S203, the terminal 20A transmits SCI using PSCCH and / or PSSCH and SL data using PSSCH using the resources autonomously selected in step S201. For example, the terminal 20A can transmit PSCCH using frequency resources adjacent to frequency resources of PSSCH in at least a part of the time resources of PSSCH.

[0088] In step S204, the terminal 20A retransmits SCI based on PSCCH and / or PSSCH and SL data based on PSSCH to the terminal 20B using the resources autonomously selected in step S201. The retransmission in step S204 can also be performed multiple times.

[0089] In addition, in a case where blind retransmission is not performed, step S204 can also not be performed.

[0090] Figure 12 is a timing chart illustrating an action example (3) of V2X. The base station 10 can perform scheduling of a sidelink. That is, the base station 10 can decide resources of a sidelink used by the terminal 20 and transmit information indicating the resources to the terminal 20. Also, in a case where HARQ control accompanied by HARQ feedback is applied, the base station 10 can transmit information indicating resources of a PSFCH to the terminal 20.

[0091] In step S301, the base station 10 transmits DCI (Downlink Control Information) to the terminal 20A using PDCCH, thereby performing SL scheduling. Hereinafter, for convenience of explanation, the DCI for SL scheduling will be referred to as SL scheduling DCI (SL scheduling DCI).

[0092] Further, a case is assumed in which the base station 10 further transmits a DCI for DL scheduling (may also be referred to as DL assignment) to the terminal 20A using the PDCCH in step S301. Hereinafter, for convenience of explanation, 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 using the PDSCH using the resource specified by the DL scheduling DCI.

[0093] In steps S302 and S303, the terminal 20A transmits SCI (Sidelink Control Information) using the PSCCH and / or the PSSCH and transmits SL data using the PSSCH using the resource specified by the SL scheduling DCI. In addition, in the SL scheduling DCI, only the resource of the PSSCH can be specified. In this case, for example, the terminal 20A can transmit the PSCCH using the frequency resource adjacent to the frequency resource of the PSSCH in the same time resource as at least a part of the time resource of the PSSCH.

[0094] The terminal 20B receives the SCI (PSCCH and / or PSSCH) and the SL data (PSSCH) transmitted from the terminal 20A. In the SCI received using the PSCCH and / or the PSSCH, information of the resource of the PSFCH for the terminal 20B to transmit HARQ-ACK for the reception of the data is included.

[0095] The information of the resource is included in the DL scheduling DCI or the SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A acquires the information of the resource from the DL scheduling DCI or the SL scheduling DCI and includes it in the SCI. Alternatively, assuming that the information of the resource is not included in the DCI transmitted from the base station 10, the terminal 20A autonomously includes the information of the resource in the SCI and transmits it.

[0096] In step S304, the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resource of the PSFCH determined from the received SCI.

[0097] In step S305, the terminal 20A transmits the HARQ-ACK using the PUCCH (Physical uplink control channel) resource designated by the DL scheduling DCI (or the SL scheduling DCI) at the timing (for example, timing in units of slots) designated by the DL scheduling DCI (or the SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The codebook of the HARQ-ACK can include the HARQ-ACK generated based on the HARQ-ACK received from the terminal 20B or the HARQ-ACK generated based on the non-received PSFCH, and the HARQ-ACK for the DL data. However, in the case where there is no allocation of the DL data, or the like, the HARQ-ACK for the DL data is not included. In Rel. 16 of NR, the HARQ-ACK for the DL data is not included in the codebook of the HARQ-ACK.

[0098] In addition, in a case where the HARQ control accompanied by the HARQ feedback is not performed, step S304 and / or step S305 can not be performed.

[0099] Figure 13 is a timing chart illustrating Action Example (4) of V2X. As described above, a case where the HARQ response is transmitted by the PSFCH is supported in the sidelink of NR. In addition, the format of the PSFCH can use the same format as the PUCCH (Physical Uplink Control Channel) format 0 (PUCCH format 0), for example. That is, regarding the format of the PSFCH, it can be a sequence-based format in which the PRB (Physical Resource Block) size is 1, and the ACK and the NACK are identified according to the difference in timing and / or cyclic shift. The format of the PSFCH is not limited thereto. The resource of the PSFCH can be configured in the symbol at the end of the slot or the plurality of symbols at the end. Furthermore, the period N is set or predetermined for the PSFCH resource. The period N can be set or predetermined in units of slots.

[0100] In Figure 13In the above, the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. The PSCCH can be configured in one symbol at the start of the slot, can be configured in a plurality of symbols from the start, and can be configured in a plurality of symbols from a symbol other than the start. The PSFCH can be configured in one symbol at the end of the slot, and can be configured in a plurality of symbols at the end of the slot. In addition, the above-described "start of the slot" and "end of the slot" can omit consideration of a symbol for AGC (Automatic Gain Control) and a symbol for transmission / reception switching. That is, for example, in a case where one slot is configured by 14 symbols, the "start of the slot" and the "end of the slot" can mean a symbol at the start and a symbol at the end, respectively, among 12 symbols other than the symbols at the start and the end. In Figure 13 In the example shown in the drawing, three sub-channels are set in the resource pool, and two PSFCHs are configured after three slots in which the PSSCH is configured. The arrow from the PSSCH to the PSFCH shows an example of the PSFCH associated with the PSSCH.

[0101] In the case of the multicast option 2 in which the HARQ response is to transmit ACK or NACK in the groupcast of the NR-V2X, it is necessary to decide the resource used in the transmission and reception of the PSFCH. As shown in the drawing, Figure 13 In step S401, the terminal 20A as the transmitting side terminal 20 performs groupcast to the terminal 20B, the terminal 20C, and the terminal 20D as the receiving side terminals 20 via the SL-SCH. In the next step S402, the terminal 20B transmits the HARQ response to the terminal 20A using the PSFCH #B, the terminal 20C transmits the HARQ response to the terminal 20A using the PSFCH #C, and the terminal 20D transmits the HARQ response to the terminal 20A using the PSFCH #D. Here, as shown in the example of the drawing, Figure 13 As shown in the example of the drawing, in a case where the number of the resources of the PSFCH that can be used is less than the number of the receiving side terminals 20 belonging to the group, it is necessary to decide how to allocate the resources of the PSFCH. In addition, the transmitting side terminal 20 can grasp the number of the receiving side terminals 20 in the groupcast. In addition, in the groupcast option 1, only NACK is transmitted as the HARQ response, and ACK is not transmitted.

[0102] Figure 14 is a drawing showing an example of the monitoring action in the NR. In the resource allocation mode 2, the terminal 20 selects a resource to transmit. As shown in the drawing, Figure 14As shown, terminal 20 monitors within a monitoring window within a resource pool. Through monitoring, terminal 20 receives the resource reservation field or resource assignment field contained in the SCI sent from other terminals 20. Based on this field, terminal 20 identifies available resource candidates within a resource selection window within the resource pool. Terminal 20 then randomly selects a resource from the available resource candidates.

[0103] In addition, if Figure 14 As shown, the resource pool may be configured with a period, for example, a period of 10240 milliseconds. Figure 14 is time slot t0 SL To time slot t Tmax SL The resource pool area in each cycle can be set by, for example, a bitmap.

[0104] In addition, if Figure 14 As shown, assuming that the transmission trigger in terminal 20 occurs in time slot n, the priority of the transmission is p TX The terminal 20 can detect the time from time slot n-T0 to time slot nT proc,0 In the monitoring window up to the immediately preceding time slot, for example, other terminals 20 are performing priority p RX When SCI is detected in the monitoring window and RSRP (Reference Signal Received Power) is greater than the threshold, the resources in the resource selection window corresponding to the SCI are excluded. In addition, when SCI is detected in the monitoring window and RSRP is less than the threshold, the resources in the resource selection window corresponding to the SCI are not excluded. The threshold can also be, for example, based on the priority p TX and priority p RX The threshold value Th is set or defined according to each resource in the monitoring window. pTX,pRX .

[0105] In addition, if Figure 14 The time slot t shown m SL In this way, for example, resources within the resource selection window for transmission corresponding to resources within the monitoring window that have not been monitored are excluded as candidates for resource reservation information.

[0106] like Figure 14As shown, in the resource selection window from time slot n+T1 to time slot n+T2, the resources occupied by other UEs are identified, and the resources after the resources are excluded become the available resource candidates. When the set of available resource candidates is set to S A When S A If the resource selection window is less than 20%, the threshold value Th set for each resource in the monitoring window can be set to pTX,pRX The resource identification is performed again by increasing the threshold Th by 3dB. pTX,pRX The resource identification is performed again to increase the number of resources that are not excluded because the RSRP is less than the threshold, so that the set of resource candidates S A Become more than 20% of the resource selection window. A If the resource selection window is less than 20%, the threshold value Th set for each resource in the monitoring window can be repeatedly adjusted. pTX,pRX The resource identification operation is performed again by increasing the value by 3dB.

[0107] The lower layer of terminal 20 can A Report to the upper layer. The upper layer of terminal 20 can report to S A The resource to be used is determined by performing random selection, and the terminal 20 can perform sidelink transmission using the determined resource.

[0108] In the above Figure 14 In the description, the operation of the transmitting terminal 20 is described, but the receiving terminal 20 may detect data transmission from another terminal 20 based on the result of monitoring or partial monitoring, and receive data from the other terminal 20.

[0109] Figure 15 is a flowchart showing an example of preemption in NR. Figure 16 is a diagram showing an example of preemption in NR. In step S501, the terminal 20 performs monitoring in the monitoring window. When the terminal 20 performs power saving operation, the monitoring can be performed during a predefined limited period. Then, the terminal 20 identifies each resource in the resource selection window based on the monitoring results and determines a set of resource candidates S. A , select the resource to be used in transmission (S502). Next, the terminal 20 selects the resource candidate set S A The resource set (r_0, r_1, ...) to be determined for preemption is selected (S503). The resource set can be notified from the higher layer to the PHY layer as a resource for determining whether to be preempted.

[0110] In step S504, the terminal 20 Figure 16 The timing of T(r_0)-T3 shown in the figure is used to identify the resources in the resource selection window again based on the monitoring results, and the set of resource candidates S is determined.A , and further, according to the priority, determines preemption for the resource set (r_0, r_1,...). For example, Figure 16 r_1 shown in FIG. 6 detects SCI transmitted from the other terminal 20 by monitoring again, and is not included in S A In a case where preemption is valid, in a case where a value prio_RX representing the priority of the SCI transmitted from the other terminal 20 is lower than a value prio_TX representing the priority of the transport block transmitted from the own terminal, the terminal 20 determines that the resource r_1 is preempted. In addition, the priority becomes higher as the value representing the priority is lower. That is, in a case where a value prio_RX representing the priority of the SCI transmitted from the other terminal 20 is higher than a value prio_TX representing the priority of the transport block transmitted from the own terminal, the terminal 20 does not exclude the resource r_1 from S A Alternatively, in a case where preemption is valid only in a specific priority (for example, sl-PreemptionEnable is any one of pl1, pl2,..., pl8), the priority is set to prio_pre. At this time, in a case where a value prio_RX representing the priority of the SCI transmitted from the other terminal 20 is lower than prio_pre and prio_RX is lower than a value prio_TX representing the priority of the transport block transmitted from the own terminal, the terminal 20 determines that the resource r_1 is preempted.

[0111] In step S505, in a case where the terminal 20 determines preemption in step S504, the terminal 20 notifies the higher layer of preemption, reselection of the resource is performed in the higher layer, and preemption ends.

[0112] In the sidelink of NR Release 17, power saving based on random resource selection and partial sensing is being studied. For example, in order to save power, random resource selection and partial sensing of the sidelink in LTE Release 14 can be applied to resource allocation mode 2 of the sidelink in NR Release 16. The terminal 20 to which partial sensing is applied performs reception and sensing only in specific slots within a monitoring window.

[0113] In addition, in the sidelink of NR Release 17, eURLLC (enhanced Ultra Reliable Low Latency Communication) is being studied as a baseline of inter-UE coordination. For example, the terminal 20A shares information representing a resource set with the terminal 20B, and the terminal 20B can consider the information in resource selection for transmission.

[0114] In the terminal 20, in a case where the SL transmission overlaps with the UL transmission at least in the time domain, the reliability and the delay performance of the SL transmission are affected. For example, the terminal 20 decides which of the SL transmission or the UL transmission to be overlapped is prioritized. Then, depending on the capability of the terminal, the action is decided. For example, in a case where the SL and the UL can be transmitted simultaneously, the power of the transmission which is not prioritized is reduced and the simultaneous transmission is performed so that the total transmission power does not exceed the maximum value. Further, for example, in a case where the SL and the UL cannot be transmitted simultaneously, the transmission which is not prioritized is discarded and the transmission which is prioritized is performed.

[0115] Further, in a case where the UL transmission overlaps with the SL reception, the reliability and the delay performance of the SL communication are affected. For example, the terminal 20 decides which of the UL transmission or the SL reception to be overlapped is prioritized. Then, for example, the communication which is not prioritized is discarded and the communication which is prioritized is performed.

[0116] As described above, in the related art, although the processing in a case where the UL transmission overlaps with the SL transmission or the reception is specified, the influence on the characteristics cannot be avoided at the timing where the overlap occurs.

[0117] Therefore, the SL transmission-side terminal 20A can perform the action related to the resource allocation based on at least one of the information indicated by a) to c) described below.

[0118] a) information related to the UL transmission of the terminal 20A received from the network or the base station 10

[0119] b) information related to the UL transmission of the terminal 20B received from the SL reception-side terminal 20B

[0120] c) information related to the UL transmission of the SL reception-side terminal 20B received from the network or the base station 10

[0121] Hereinafter, the definition and the acquisition method of the information indicated by a) to c) described above are described. Further, hereinafter, the details of the action related to the resource allocation are described.

[0122] As described above, by the SL transmission-side terminal 20 performing the resource allocation action based on the information described above, it is possible to avoid the occurrence of the overlap between the SL transmission and the UL transmission or the overlap between the SL reception and the UL transmission. Therefore, it is possible to prevent the degradation of the reliability and the delay performance of the sidelink communication due to the overlap.

[0123] Figure 17 is a diagram showing an example (1) of the communication situation in the embodiment of the present application. As shown in FIG. 8, in the example (1), the SL transmission and the UL transmission overlap in the time domain. In this case, the terminal 20A which is the SL transmission-side terminal decides which of the SL transmission or the UL transmission to be overlapped is prioritized. Then, the terminal 20A performs the action related to the resource allocation based on the information described above. Figure 17As shown, the terminal 20A performs SL transmission to the terminal 20B, and receives an UL grant from the base station 10, and performs UL transmission. The information a) described above, which is received from the network or the base station 10, and which is related to UL transmission by the terminal 20A, can be information related to a resource in which the terminal 20A is scheduled to perform UL transmission, and can be at least one of the information described in 1) to 5) below.

[0124] 1) Information indicating a dynamically scheduled PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in the time domain.

[0125] 2) Information indicating a configured or activated PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in the time domain, or a periodic resource. The information can be the periodicity.

[0126] 3) Information indicating a PRACH resource corresponding to a received SSB (SS / PBCH block).

[0127] 4) Information indicating a priority related to UL transmission. For example, the priority can be a PHY priority, i.e., a priority in Layer 1, or a MAC priority, i.e., a priority in Layer 2.

[0128] 5) Information indicating a channel type, a signal type, or an information type related to UL transmission. For example, the channel type can be a PUCCH, a PUSCH, a PRACH, or the like. For example, the signal type can be an SRS, or the like. For example, the information type can be an UL-SCH, a HARQ-ACK, an SR, or a CSI, or the like.

[0129] Figure 18 is a diagram showing an example (2) of a communication situation in an embodiment of the present application. As shown, the terminal 20A performs SL transmission to the terminal 20B, and receives an UL grant from the base station 10, and performs UL transmission. The information b) described above, which is received from the SL reception-side terminal 20B, and which is related to UL transmission by the terminal 20B, can be information related to a resource in which the terminal 20B is scheduled to perform UL transmission, and can be at least one of the information described in 1) to 5) below. Figure 18

[0130] 1) Information indicating a dynamically scheduled PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in the time domain.

[0131] ​2) Information indicating a configured or activated PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in a time domain, or a periodic resource. The information can be a periodicity.

[0132] 3) Information indicating a PRACH resource corresponding to a received SSB (SS / PBCH block).

[0133] 4) Information indicating a priority related to UL transmission. For example, the priority can be a PHY priority, i.e., a priority in Layer 1, or a MAC priority, i.e., a priority in Layer 2.

[0134] 5) Information indicating a channel type, a signal type, or an information type related to UL transmission. For example, the channel type can be PUCCH, PUSCH, PRACH, or the like. For example, the signal type can be SRS or the like. For example, the information type can be UL-SCH, HARQ-ACK, SR, or CSI, or the like.

[0135] The above information can be shared or transmitted from the terminal 20B to the terminal 20A via any one of PHY, MAC, and PC5-RRC signaling. Further, the terminal 20B can share with the terminal 20A at any one of 1) to 3) shown below as an opportunity.

[0136] 1) When information related to UL transmission is received from the base station 10.

[0137] 2) When requested by another terminal 20.

[0138] 3) When a priority related to UL transmission satisfies a predetermined condition (for example, when it is a higher priority than a certain priority or a lower priority than a certain priority).

[0139] Figure 19 is a diagram illustrating an example (3) of a communication situation in an embodiment of the present application. As shown in Figure 19 , the terminal 20A performs SL transmission to the terminal 20B, and receives a UL grant from the base station 10, and performs UL transmission. The information related to UL transmission of the SL reception-side terminal 20B received from the network or the base station 10 can be information related to a resource on which the terminal 20B is scheduled to perform UL transmission, and at least one of the information shown in 1) to 5) below.

[0140] 1) Information indicating a dynamically scheduled PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in a time domain.

[0141] 2) information indicating a configured or activated PUSCH, PUCCH, or SRS resource. For example, the resource can be a resource in a time domain, or a periodic resource. The information can be the periodicity.

[0142] 3) information indicating a PRACH resource corresponding to a received SSB (SS / PBCH block).

[0143] 4) information indicating a priority related to UL transmission. For example, the priority can be a PHY priority, i.e., a priority in Layer 1, or a MAC priority, i.e., a priority in Layer 2.

[0144] 5) information indicating a channel type, a signal type, or an information type related to UL transmission. For example, the channel type can be PUCCH, PUSCH, PRACH, or the like. For example, the signal type can also be SRS or the like. For example, the information type can also be UL-SCH, HARQ-ACK, SR, or CSI, or the like.

[0145] The above information can be transmitted from the base station 10 to the terminal 20A via any one of PHY, MAC, and PC5-RRC signaling.

[0146] Figure 20 is a diagram illustrating an example of resource allocation in an embodiment of the present application. The resource set S Figure 20 is set to all candidate resources included in a resource selection window before the resource exclusion operation is performed. The resource set S A may be determined based on at least one of the above information a), b), and c) according to at least one of the following conditions 1) to 5). B In addition, in Figure 20 , the resource surrounded by a solid line indicates S A , the resource surrounded by a dashed line indicates S B , and the resource surrounded by a single-dot chain line indicates S C . In addition, S B is a resource set used in a flowchart of an example of resource selection explained in Figures 21-24 . Sc is a resource set in S A that is not included in S B .

[0147] Condition 1) can include, in S B , a PSCCH and / or PSSCH resource in a time resource or a time slot in which the terminal 20A does not perform UL transmission and / or the terminal 20B does not perform UL transmission. In addition, it is also possible to exclude, from SB PSCCH and / or PSSCH resources in the time resources or slots in which the terminal 20A does not perform UL transmission and / or the terminal 20B does not perform UL transmission.

[0148] Condition 2) can include PSCCH and / or PSSCH resources in the time resources or slots corresponding to a certain PSFCH opportunity in the same time resources as the PSFCH opportunity, in a case where the terminal 20A does not perform UL transmission and / or the terminal 20B does not perform UL transmission. B

[0149] Condition 3) can exclude PSCCH and / or PSSCH resources in the time resources or slots corresponding to a certain PSFCH opportunity from S B in a case where the terminal 20A performs UL transmission and / or the terminal 20B performs UL transmission.

[0150] Condition 4) can include PSCCH and / or PSSCH resources in the time resources or slots that satisfy both Condition 1 and Condition 2 in S B . Furthermore, PSCCH and / or PSSCH resources in the time resources or slots that satisfy all of Condition 1, Condition 2, and Condition 3 can be included in S B . Figure 20 is an example of S B that satisfies all of Condition 1, Condition 2, and Condition 3.

[0151] Condition 5) can determine S B according to the priority of UL transmission and / or the priority of SL transmission. For example, in a case where the priority of UL transmission is lower than the priority of SL transmission in S Figure 20 , slots in which UL transmission is configured can be included in S B .

[0152] Figure 21 is a flowchart for explaining Example (1) of resource selection in the embodiment of the present application. In step S611, the terminal 20 sets a resource set S A to be identified. S A at the time of step S611 can be set as an initial resource set. Next, the terminal 20 performs monitoring (S612). In addition, step S611 and step S612 can also be executed in the reverse order. In the following step S613, the terminal 20 excludes resources from S A based on RSRP based on monitoring, and updates S A . This action of excluding resources can be the same as the example of monitoring explained using FIG. 14. Figure 14 ​​

[0153] In step S614, the terminal 20 determines whether or not the number of resources included in S A is K% or more. In the case of K% or more, the process proceeds to step S615, and in the case of less than K%, the process proceeds to step S616. K can be an arbitrary value, and for example, can be 20, 30, or 50.

[0154] In step S615, the terminal 20 reports S A to the higher layer. On the other hand, in step S616, the terminal 20 changes the threshold value for determining RSRP, and executes step S613 again. The terminal 20 can, for example, increase the threshold value by 3 dB.

[0155] In step S617, the terminal 20 can further select a resource to be used from the resources included in S A when performing resource selection in S B . For example, in the case where the resources included in S B are included in S A , a resource that must be used can be selected from the resources included in S B . Further, in the case where the resources included in S B are not included in S A , an arbitrary resource included in S A can be selected. Further, the probability of selecting a resource to be used from the resources included in S A in S B can be increased, and the probability of selecting a resource to be used from the resources not included in S A in S B can be decreased.

[0156] Figure 22 is a flowchart for explaining example (2) of resource selection in the embodiment of the present application. In step S621, the terminal 20 sets a resource set S A to be identified. S A at the timing of step S621 can be set as the initial resource set. Next, the terminal 20 performs monitoring (S622). Alternatively, step S621 and step S622 can be executed in the reverse order. In the following step S623, the terminal 20 excludes resources from S A based on RSRP based on the monitoring, and updates S A . This action of excluding resources can be the same as the example of monitoring explained using FIG. 21. Figure 14

[0157] In step S624, the terminal 20 determines whether or not the resources included in S A and S B are resources included in S​A If it is Z1% or more, go to step S625, if it is less than Z1%, go to step S626. Z1 can be any value, for example, it can be 20, 30, or 50. A and S B The resources included in S A and included in S B Resources in .

[0158] In addition, in step S624, the terminal 20 may determine whether S A and S B Is the resource contained in the S at the time of step S621? A That is, it is greater than Z2% of the initial resource set. If it is greater than Z2%, the process proceeds to step S625. If it is less than Z2%, the process proceeds to step S626. Z2 can be any value, such as 20, 30, or 50.

[0159] In step S625, the terminal 20 reports S to the upper layer. A and S B On the other hand, in step S626, the terminal 20 changes the threshold for determining RSRP and executes step S623 again. The terminal 20 may increase the threshold by 3 dB, for example.

[0160] In step S627, the terminal 20 receives the A and S B Perform resource selection among the resources contained in .

[0161] Figure 23 This is a flowchart for explaining example (3) of resource selection in the embodiment of the present invention. In step S631, the terminal 20 sets the resource set S to be identified. B The S at the moment of step S631 can be B Set as the initial resource set. Then, the terminal 20 performs monitoring (S632). In addition, steps S631 and S632 can also be performed in the reverse order. In the next step S633, the terminal 20 selects the resource set from S according to the monitored RSRP. B Exclude resources from S B Update. This action of excluding resources can be used with Figure 14 The monitoring examples described are the same.

[0162] In step S634, the terminal 20 determines whether BIs it greater than K% of the initial resource set? If so, proceed to step S635; if less than K%, proceed to step S636. K can be any value, such as 20, 30, or 50.

[0163] In step S635, the terminal 20 reports S to the upper layer. B On the other hand, in step S636, the terminal 20 changes the threshold for determining RSRP and executes step S633 again. For example, the terminal 20 may increase the threshold by 3 dB.

[0164] In step S637, the terminal 20 receives the B Resource selection is performed in .

[0165] Figure 24 This is a flowchart for explaining example (4) of resource selection in the embodiment of the present invention. In step S641, the terminal 20 sets the resource set S to be identified. A The S at the moment of step S641 can be A Set as the initial resource set. Then, the terminal 20 performs monitoring (S642). In addition, steps S641 and S642 can also be performed in the reverse order.

[0166] In the next step S643, the terminal 20 obtains the RSRP from S A Exclude resources from S A To update. Here, apply to "S A Included in S B The threshold of RSRP of resources in A Not included in S B The threshold used in the determination of the RSRP of the resources in the “S A Included in S B The RSRP of the resources in the "threshold ratio" is applied to the "S A Not included in S B The RSRP threshold of the resource in the 'rising' threshold is XdB. This action of excluding resources can be used with Figure 14 The monitoring examples described are the same.

[0167] In step S644, the terminal 20 determines whether A Is it greater than K% of the initial resource set? If so, proceed to step S645; if less than K%, proceed to step S646. K can be any value, such as 20, 30, or 50.

[0168] In step S645, the terminal 20 reports S to the upper layer.A On the other hand, in step S646, the terminal 20 changes the threshold of the determination of the RSRP, and executes step S643 again. The terminal 20 can, for example, raise the threshold by 3 dB.

[0169] In step S647, the terminal 20 performs resource selection from the S A resources.

[0170] For example, the reevaluation of the resources can be performed as a trigger of the acquisition of the information illustrated in a), b), or c) described above. The reevaluation of the resources can be performed in association with the determination of the preemption described in steps S631 to S634 and steps S641 to S644. Figure 15 Figure 16

[0171] In addition, the actions related to the resource selection described in steps S611 to S616 can be applied to the reevaluation of the resources and / or the preemption. Figures 21-24

[0172] In addition, which of the actions related to the resource selection described in steps S611 to S616 is applied can be set on a per-priority basis. Figures 21-24

[0173] In addition, each of the steps of the actions related to the resource selection described in steps S611 to S616 can be combined or permuted. For example, step S627 or step S647 can be changed to step S617. For example, step S614 or step S644 can be changed to step S624. For example, step S613 or step S623 can be changed to step S643. Figures 21-24 In addition, which of the actions related to the resource selection described in steps S611 to S616 is applied can be set according to whether or not the terminal 20 has the capability of simultaneously transmitting SL and UL.

[0174] Figures 21-24

[0175] In addition, the actions described above can be applied to the actions of the setting or the allocation of the transmission resources of other terminals 20 by a certain terminal 20. That is, the setting or the allocation of the resources can be performed so as to satisfy the embodiments described above.

[0176] The embodiments described above are not limited to V2X terminals, and can be applied to terminals that perform D2D communication.

[0177] The actions related to the embodiments described above can be performed only in a certain resource pool. For example, the actions can be performed only in a resource pool that can be used by a terminal 20 of Release 17 or later.

[0178] ​​​​​​The above-described embodiments can be applied between terminals 20 that have established a PC5-RRC connection. The above-described embodiments can also be applied to any one of broadcast, groupcast, and unicast. In the above-described embodiments, the "terminal 20" can correspond to a plurality of terminals 20.

[0179] According to the above-described embodiments, the terminal 20 can improve reliability related to sidelink transmission in monitoring-based resource identification and resource selection in the sidelink by taking into account resources of the time domain used in the uplink.

[0180] That is, in inter-terminal direct communication, it is possible to improve reliability of communication at the time of autonomous resource selection.

[0181] (Functional Configuration of Apparatus)

[0182] Next, a functional configuration example of the base station 10 and the terminal 20 that execute the above-described processing and actions will be described. The base station 10 and the terminal 20 include functions that implement the above-described embodiments. However, the base station 10 and the terminal 20 can each have only a part of the functions in the embodiments.

[0183] (Base Station 10)

[0184] Figure 25 is a diagram showing an example of a functional configuration of the base station 10. As shown in Figure 25 , the base station 10 has a transmission section 110, a reception section 120, a setting section 130, and a control section 140. Figure 25 The functional configuration shown in the drawing is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions related to the embodiments of the present application can be executed.

[0185] The transmission section 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal in a wireless manner. The reception section 120 includes a function of receiving various signals transmitted from the terminal 20 and extracting, for example, higher layer information from the received signals. Further, the transmission section 110 has a function of transmitting an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, a DL reference signal, and the like to the terminal 20.

[0186] The setting section 130 stores setting information set in advance and various setting information transmitted to the terminal 20 in a storage device and reads out from the storage device as necessary. The content of the setting information is, for example, information related to the setting of D2D communication and the like.

[0187] As explained in the embodiment, the control section 140 performs processing relating to the setting for the terminal 20 to perform D2D communication. Further, the control section 140 transmits scheduling information of D2D communication and DL communication to the terminal 20 via the transmission section 110. Further, the control section 140 receives information relating to HARQ responses of D2D communication and DL communication from the terminal 20 via the reception section 120. The functional section in the control section 140 relating to signal transmission can be included in the transmission section 110, and the functional section in the control section 140 relating to signal reception can be included in the reception section 120.

[0188] <terminal 20>

[0189] Figure 26 is a diagram showing an example of a functional structure of the terminal 20. As shown in Figure 26 , the terminal 20 has a transmission section 210, a reception section 220, a setting section 230, and a control section 240. Figure 26 The functional structure shown in the drawing is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions related to the embodiments of the present application can be performed.

[0190] The transmission section 210 generates a transmission signal from transmission data and transmits the transmission signal in a wireless manner. The reception section 220 receives various signals in a wireless manner and acquires signals of higher layers from the received physical layer signals. Further, the reception section 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, or reference signals, and the like, transmitted from the base station 10. Further, for example, as D2D communication, the transmission section 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), and the like, to other terminals 20, and the reception section 220 receives PSCCH, PSSCH, PSDCH, or PSBCH, and the like, from other terminals 20.

[0191] The setting section 230 stores various setting information received by the reception section 220 from the base station 10 or the terminal 20 in a storage device and reads out as necessary from the storage device. Further, the setting section 230 also stores setting information set in advance. The content of the setting information is, for example, information relating to the setting of D2D communication, and the like.

[0192] As explained in the embodiments, the control section 240 controls D2D communication that establishes an RRC connection with other terminal 20. Further, the control section 240 performs processing related to power saving operation. Further, the control section 240 performs processing related to HARQ of D2D communication and DL communication. Further, the control section 240 transmits information related to HARQ response of D2D communication and DL communication to other terminal 20, which is scheduled by the base station 10, to the base station 10. Further, the control section 240 can also perform scheduling of D2D communication to other terminal 20. Further, the control section 240 can autonomously select resources used in D2D communication from a resource selection window according to the result of monitoring, and can perform reevaluation or preemption. Further, the control section 240 performs processing related to power saving in transmission and reception of D2D communication. Further, the control section 240 performs processing related to inter-terminal coordination in D2D communication. The functional section in the control section 240 related to signal transmission can be included in the transmitting unit 210, and the functional section in the control section 240 related to signal reception can be included in the receiving unit 220.

[0193] (Hardware structure)

[0194] The block diagrams used in the description of the above embodiments Figure 25 and Figure 26 illustrate blocks in units of functions. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized using one device that is physically or logically integrated, or two or more devices that are physically or logically separated can be directly or indirectly (for example, using wired, wireless, or the like) connected and realized using the plurality of devices. Each functional block can also be realized by combining software with the above one device or the above plurality of devices.

[0195] have judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited thereto. For example, a functional block (structural unit) that causes transmission to function is referred to as a transmitting unit or a transmitter. In any case, as described above, the method of realization is not particularly limited.

[0196] For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure can also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 27 is a diagram illustrating an example of a hardware structure of the base station 10 and the terminal 20 of one embodiment of the present disclosure. The above-described base station 10 and terminal 20 can also be physically configured as a computer device including a processor 1001, a storage 1002, an auxiliary storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0197] In addition, in the following description, the expression "device" can be replaced with "circuitry", "equipment", "unit", and the like. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or a plurality of each of the illustrated devices, or can be configured not to include a part of the devices.

[0198] Each function in the base station 10 and the terminal 20 is realized by reading a predetermined software (program) into the hardware such as the processor 1001, the storage 1002, and the like, so that the processor 1001 performs an operation and controls at least one of communication of the communication device 1004 or reading and writing of data in the storage 1002 and the auxiliary storage 1003.

[0199] The processor 1001 controls the entire computer, for example, by causing an operating system to operate. The processor 1001 can also be configured by a central processing device (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the above-described control section 140, the control section 240, and the like can also be realized by the processor 1001.

[0200] Further, the processor 1001 reads a program (program code), a software module, or data, and the like from at least one of the auxiliary storage 1003 and the communication device 1004 to the storage 1002, and performs various processing based on this. As the program, a program that causes a computer to perform at least a part of the operations described in the above-described embodiments is used. For example, Figure 25 The control section 140 of the illustrated base station 10 can also be realized by a control program stored in the storage 1002 and operated in the processor 1001. Further, for example, Figure 26The control section 240 of the terminal 20 shown can also be implemented by a control program stored to the storage device 1002 and operated in the processor 1001. With respect to the various processes described above, while it is described that the various processes described above are executed by one processor 1001, the various processes described above can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be mounted by one or more chips. Further, the program can also be transmitted from a network via a telecommunication line.

[0201] The storage device 1002 is a computer-readable recording medium, and can be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and the like. The storage device 1002 can also be referred to as a register, a cache, a main memory (main storage device), and the like. The storage device 1002 is capable of holding a program (program code), a software module, and the like that can be executed in order to implement the communication method related to one embodiment of the present disclosure.

[0202] The auxiliary storage device 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, 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 (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like. The storage medium described above can be, for example, a database, a server, and other appropriate medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0203] The communication device 1004 is hardware (transmitting / receiving device) for communication between computers via at least one of a wired network and a wireless network, for example, also referred to as a network device, a network controller, a network card, a communication module, and the like. The communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmitting / receiving antenna, an amplifying section, a transmitting / receiving section, a transmission path interface, and the like can also be implemented by the communication device 1004. The transmitting / receiving section can also be installed physically or logically by a transmitting section and a receiving section.

[0204] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, and the like) that performs an output to the outside. In addition, the input device 1005 and the output device 1006 can also be integrally configured (for example, a touch panel).

[0205] Furthermore, the processor 1001 and each device such as the storage device 1002 are connected by a bus 1007 for communication of information. The bus 1007 can be configured by a single bus, or can be configured by different buses between the devices.

[0206] Furthermore, the base station 10 and the terminal 20 can be configured to include a microprocessor, a digital signal processor (DSP), an ASIC, a PLD, a FPGA, and the like, and a part or all of each functional block can also be implemented by the hardware. For example, the processor 1001 can also be implemented using at least one of these hardware.

[0207] (Summary of Embodiments)

[0208] As explained above, according to the embodiment of the present application, there is provided a terminal having: a reception section that receives information related to resource reservation in a monitoring window; a control section that excludes resources from a set of resource candidates according to a RSRP (Reference Signal Received Power) at the time of reception of the information related to resource reservation and a priority included in the information related to resource reservation, selects resources used in transmission from the set of resource candidates after the exclusion; and a transmission section that transmits to other terminals using the selected resources, the control section further excluding resources from the set of resource candidates or selecting resources used in transmission from the set of resource candidates after the exclusion according to information related to uplink transmission.

[0209] According to the above-described structure, the terminal 20 is able to improve reliability related to sidelink transmission in monitoring-based resource identification and resource selection in the sidelink by taking into account resources in the time domain used in the uplink. That is, in inter-terminal direct communication, it is possible to improve reliability of communication at the time of autonomous resource selection.

[0210] The information related to uplink transmission can also be information indicating resources used in uplink transmission scheduled by the terminal itself or the other terminal. According to this structure, the terminal 20 is able to improve reliability related to sidelink transmission in monitoring-based resource identification and resource selection in the sidelink by taking into account resources in the time domain used in the uplink.

[0211] The control section can also exclude resources in the time domain in which uplink transmission is performed from the set of resource candidates according to the information related to uplink transmission. According to this structure, the terminal 20 is able to improve reliability related to sidelink transmission in monitoring-based resource identification and resource selection in the sidelink by not using resources in the time domain used in the uplink.

[0212] The control section can also exclude, from the set of resource candidates, resources of a PSCCH (Physical Sidelink Control Channel) and a PSSCH (Physical Sidelink Shared Channel) corresponding to a PSFCH (Physical Sidelink Feedback Channel) opportunity in a time domain in which uplink transmission is performed, according to the information related to uplink transmission. According to this structure, the terminal 20 can improve reliability related to sidelink transmission in resource identification and resource selection based on monitoring in a sidelink, by not using resources corresponding to data of a PSFCH corresponding to a time domain used in uplink.

[0213] The control section can also select resources used in transmission from resources other than resources in a time domain in which uplink transmission is performed, in the set of resource candidates after exclusion. According to this structure, the terminal 20 can improve reliability related to sidelink transmission in resource identification and resource selection based on monitoring in a sidelink, by taking into account resources of a time domain used in uplink.

[0214] Further, according to an embodiment of the present application, there is provided a communication method in which the following steps are performed by a terminal: a reception step of receiving information related to resource reservation in a monitoring window; a control step of excluding resources from a set of resource candidates according to an RSRP (Reference Signal Received Power) at the time of reception of the information related to resource reservation and a priority included in the information related to resource reservation, and selecting resources used in transmission from the set of resource candidates after exclusion; a transmission step of transmitting to another terminal using the selected resources; and a step of further excluding resources from the set of resource candidates according to information related to uplink transmission or selecting resources used in transmission from the set of resource candidates after exclusion.

[0215] According to the above structure, the terminal 20 can improve reliability related to sidelink transmission in resource identification and resource selection based on monitoring in a sidelink, by taking into account resources of a time domain used in uplink. That is, in direct communication between terminals, it is possible to improve reliability of communication at the time of autonomous resource selection.

[0216] (Supplement to Embodiments)

[0217] The above describes the embodiments of the present application, but the disclosed application is not limited to such embodiments, and those skilled in the art will understand various modifications, changes, alternatives, substitutions, and the like. Specific numerical examples are used for facilitating understanding of the application, but as long as not particularly indicated, these values are only one example, and any appropriate value can be used. The division of items in the above description is not essential to the present application, and matters described in two or more items can be used in combination as needed, or matters described in one item can be applied to matters described in another item (as long as not contradictory). The boundary of a functional block or a processing block in a functional block diagram does not necessarily correspond to the boundary of a physical component. Physically, the operation of multiple functional blocks can be performed by one component, or the operation of one functional block can be performed by multiple components. As for the processing procedure described in the embodiments, the order of the processing can be changed without contradiction. For facilitating the description of the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices can also be implemented in hardware, in software, or in a combination thereof. Software that operates by a processor included in the base station 10 according to the embodiments of the present application and software that operates by a processor included in the terminal 20 according to the embodiments of the present application can each be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, and other appropriate arbitrary storage media.

[0218] Further, the notification of the information is not limited to the forms / embodiments described in the present disclosure, and other methods can be used. For example, the notification of the information can be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling can also be referred to as an RRC message, and for example, can be an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0219] The forms / embodiments described in this specification can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using another appropriate system, and a next-generation system extended therefrom. Furthermore, a plurality of systems (for example, at least one of LTE and LTE-A and 5G, and the like) can be combined and applied.

[0220] For the processes, sequences, flows, and the like of the forms / embodiments described in this specification, the order can be changed without contradiction. For example, for the methods described in this disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0221] In this specification, a specific action performed by the base station 10 is sometimes performed by an upper node thereof according to the situation. In a network constituted by one or a plurality of network nodes having the base station 10, various actions performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes (for example, consider MME or S-GW, or the like, but not limited to these) other than the base station 10, as is apparent. In the above, a case where the other network node than the base station 10 is one is exemplified, but the other network node can also be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0222] The information or signals described in this disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). Input or output can also be performed via a plurality of network nodes.

[0223] The inputted or outputted information and the like can be saved in a specific location (for example, a memory), or can be managed using a management table. The inputted or outputted information and the like can be rewritten, updated, or appended. The outputted information and the like can also be deleted. The inputted information and the like can also be transmitted to other apparatuses.

[0224] The determination in the present disclosure can be made by a value (0 or 1) represented by 1 bit, by a Boolean value (true or false), or by comparison of numerical values (for example, comparison with a predetermined value).

[0225] As for software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, it should be broadly interpreted as meaning commands, command sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and the like.

[0226] Furthermore, software, commands, information, and the like can be transmitted and received via a transmission medium. For example, in a case where software is transmitted from a website, a server, or other remote source using at least one of wired technology (coaxial cable, optical fiber cable, twisted pair cable, Digital Subscriber Line (DSL), and the like) and wireless technology (infrared rays, microwaves, and the like), at least one of these wired technology and wireless technology is included in the definition of the transmission medium.

[0227] The information, signals, and the like described in the present disclosure can also be represented using any of various different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, and the like that can be involved in the overall description of the present disclosure can be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination of these.

[0228] In addition, for the terms described in the present disclosure and terms necessary for understanding the present disclosure, terms having the same or similar meanings can be substituted. For example, at least one of a channel and a symbol can also be a signal (signaling). Furthermore, a signal can also be a message. Furthermore, a Component Carrier (CC) can also be referred to as a carrier frequency, a cell, a frequency carrier, and the like.

[0229] The terms "system" and "network" used in the present disclosure can be used interchangeably.

[0230] Furthermore, information, parameters, and the like described in the present disclosure can be expressed using absolute values, can be expressed using relative values from predetermined values, and can be expressed using corresponding other information. For example, a radio resource can also be indicated by an index.

[0231] The names used for the above-described parameters are non-limiting in any respect. Furthermore, the formulas and the like using these parameters are sometimes different from those explicitly disclosed in the present disclosure. Since various channels (for example, PUCCH, PDCCH, and the like) and information elements can be identified by all appropriate names, various names assigned to these various channels and information elements are non-limiting in any respect.

[0232] In the present disclosure, the terms "base station (BS)", "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", and the like can be used interchangeably. The base station is sometimes referred to by the terms macro cell, small cell, femto cell, pico cell, and the like.

[0233] A base station can accommodate one or a plurality of (for example, 3) cells. In the case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each of the smaller areas can also be provided with a communication service by a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). The terms "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides a communication service in the coverage range.

[0234] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0235] For a mobile station, the following terms are also used by those skilled in the art as an alternative terminology: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0236] At least one of the base station and the mobile station can be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. In addition, at least one of the base station and the mobile station can be a device mounted on a moving body, the moving body itself, or the like. The moving body can be a vehicle (for example, an automobile, an airplane, or the like), a moving body that moves in an unmanned manner (for example, a drone, an autonomous vehicle, or the like), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station includes an apparatus that does not necessarily move when performing communication. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0237] Furthermore, the base station in the present disclosure can be replaced with a user terminal. For example, with respect to a structure in which communication between a base station and a user terminal is replaced with communication between a plurality of terminals 20 (for example, also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), or the like), each form / embodiment of the present disclosure can be applied. In this case, the terminal 20 can be configured to have a function of the base station 10 described above. Furthermore, the expressions "uplink" and "downlink" and the like can be replaced with expressions corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, and the like can be replaced with a side channel.

[0238] Similarly, the user terminal in the present disclosure can be replaced with a base station. In this case, the base station can be configured to have a function of the user terminal described above.

[0239] The terms "determining" and "deciding" as used in the present disclosure also include a variety of actions. For example, "determining" or "deciding" can include "determining" or "deciding" that an item has been judged, calculated, computed, processed, derived, investigated, searched (e.g., searched in a table, a database, or other data structure), ascertained, or the like. In addition, "determining" or "deciding" can include "determining" or "deciding" that an item has been received (e.g., received information), transmitted (e.g., transmitted information), input, output, accessed (e.g., accessed data in a memory), or the like. Furthermore, "determining" or "deciding" can include "determining" or "deciding" that an item has been resolved, selected, chosen, established, compared, or the like. That is, "determining" or "deciding" can include "determining" or "deciding" that any action has been performed. In addition, "determining" or "deciding" can be replaced by "assuming", "expecting", "considering", or the like.

[0240] The terms "connected" and "coupled" or all modifications thereof are intended to mean all possible direct or indirect connections or couplings between two or more elements. Such a connection or coupling between two elements can include one or more intervening elements. The coupling or connection between elements can be physical or logical, or a combination thereof. For example, "connected" or "coupled" can be replaced with "accessed". In the present disclosure, it can be considered that two elements are "connected" or "coupled" to each other using at least one of a wire, a cable, and a printed circuit, and as some non-limiting and non-inclusive examples, electromagnetic energy having a wavelength in a radio frequency region, a microwave region, and an optical (both visible and invisible) region is used to "connect" or "couple" to each other.

[0241] The reference signal can be simply referred to as RS (Reference Signal), and can be referred to as a pilot according to the applied standard.

[0242] The expression "based on" as used in the present disclosure is not "only based on" unless explicitly noted otherwise. In other words, the expression "based on" means both "only based on" and "at least based on."

[0243] Any reference to elements using the expressions "1st", "2nd", and the like used in the present disclosure does not necessarily limit the number or order of the elements. These expressions can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a 1st element and a 2nd element does not mean that only two elements can be taken or that in any form the 1st element must precede the 2nd element.

[0244] The expression "unit" in the structure of each of the above-described apparatuses can be replaced with "part", "circuit", "device", or the like.

[0245] When the expressions "include", "including", and variations thereof are used in the present disclosure, these expressions mean the same as the expression "comprising". Also, the expression "or" used in the present disclosure means not only exclusive or but also inclusive or.

[0246] A radio frame can be composed of one or more slots in the time domain. In the time domain, one or more slots can be referred to as a subframe. A subframe can be further composed of one or more slots in the time domain. A subframe can also be a fixed length of time (e.g., 1 ms) independent of numerology.

[0247] A numerology can be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The numerology can indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like.

[0248] A slot can be constituted by one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, and the like) in the time domain. A slot can be a time unit based on a numerology.

[0249] A slot can include a plurality of mini-slots. Each mini-slot can be constituted by one or a plurality of symbols in the time domain. Further, a mini-slot can also be referred to as a sub-slot. A mini-slot can be constituted by a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can be referred to as PDSCH (or PUSCH) mapping type B.

[0250] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit in transmission of a signal. A radio frame, a subframe, a slot, a mini-slot, and a symbol can each be referred to by other names.

[0251] For example, one subframe can also be referred to as a transmission time interval (TTI), a plurality of consecutive subframes can also be referred to as a TTI, one slot or one mini-slot can also be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (for example, 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit representing a TTI can not be referred to as a subframe, but can be referred to as a slot, a mini-slot, or the like.

[0252] Here, a TTI, for example, refers to a minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling in which a radio resource (a frequency bandwidth, a transmission power, and the like, which can be used in each terminal 20) is allocated to each terminal 20 in units of a TTI. In addition, the definition of a TTI is not limited thereto.

[0253] A TTI can be a transmission time unit of a data packet (a transport block) after channel coding, a code block, a codeword, and the like, or can be a processing unit of scheduling, link adaptation, and the like. In addition, when a TTI is given, a time interval (for example, a number of symbols) in which a transport block, a code block, a codeword, and the like are actually mapped can be shorter than the TTI.

[0254] In addition, in a case where 1 slot or 1 mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) can constitute a minimum time unit of scheduling. Further, the number of slots (the number of mini-slots) constituting the minimum time unit of scheduling can be controlled.

[0255] A TTI having a time length of 1 ms can also be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0256] In addition, for a long TTI (e.g., a normal TTI, a subframe, etc.), a TTI having a time length longer than 1 ms can be replaced, and for a short TTI (e.g., a shortened TTI, etc.), a TTI having a TTI length shorter than the long TTI (long TTI) and having a TTI length of 1 ms or more can be replaced.

[0257] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, can include one or more contiguous subcarriers. The number of subcarriers included in the RB can be the same regardless of the numerology, for example, can be 12. The number of subcarriers included in the RB can also be determined according to the numerology.

[0258] In addition, the time domain of the RB can include one or more symbols, and can be the length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. can each be constituted by one or more resource blocks.

[0259] In addition, one or more RBs can be referred to as a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0260] In addition, a resource block can be constituted by one or more resource elements (REs). For example, 1 RE can be a wireless resource area of 1 subcarrier and 1 symbol.

[0261] A bandwidth part (BWP: Bandwidth Part) (may be referred to as a bandwidth part or the like) can mean a subset of contiguous common RBs (resource blocks) for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs from a common reference point of the carrier. The PRB can be defined in a certain BWP and numbered within the BWP.

[0262] A BWP can include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs can be configured for the terminal 20 within one carrier.

[0263] At least one of the configured BWPs can be active, and a case in which the terminal 20 transmits / receives a predetermined signal / channel outside the active BWP can not be assumed. In addition, "cell", "carrier", and the like in the present disclosure can be replaced with "BWP".

[0264] The structures of the radio frame, the subframe, the slot, the mini-slot, and the symbol described above are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in the slot, the number of symbols included in the slot or the mini-slot, the number of RBs, the number of subcarriers included in the RB, and the number of symbols, the symbol length, the cyclic prefix (CP) length, and the like within the TTI can be variously changed.

[0265] In the present disclosure, for example, in a case where an article is added by translation like a, an, and the in English, the present disclosure can also include a case where the article following the article is plural.

[0266] In the present disclosure, the expression "A is different from B" can also mean "A and B are mutually different". In addition, the expression can also mean "A and B are each different from C". The expressions "separate", "combine", and the like can also be interpreted as "different" as well.

[0267] Each form / implementation described in the present disclosure can be used alone, in combination, and can also be switched in use according to execution. In addition, the notification of the predetermined information is not limited to being performed explicitly (for example, notification of "X is") and can also be performed implicitly (for example, without performing the notification of the predetermined information).

[0268] In addition, in the present disclosure, S A is an example of a set of resource candidates.

[0269] The present disclosure has been described in detail above, but it should be understood that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in various modified and changed forms without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the purpose of the present disclosure is to illustrate, and the present disclosure is not intended to have any limiting meaning.

[0270] Label Explanation

[0271] 10: base station;

[0272] 110: transmission unit;

[0273] 120: reception unit;

[0274] 130: setting unit;

[0275] 140: control unit;

[0276] 20: terminal;

[0277] 210: transmission unit;

[0278] 220: reception unit;

[0279] 230: setting unit;

[0280] 240: control unit;

[0281] 1001: processor;

[0282] 1002: storage;

[0283] 1003: auxiliary storage;

[0284] 1004: communication device;

[0285] 1005: input device;

[0286] 1006: output device.

Claims

1. A terminal having: a reception section that receives first information indicating resources used in scheduled uplink transmission; a control section that decides, from a set of candidate resources, first resources not used in uplink transmission and second resources used in uplink transmission, in accordance with the first information; and a transmission section that transmits second information about the first resources or the second resources to another terminal, the other terminal selecting resources from among resources in a set of resources excluding the second resources from a set of its own candidate resources, in accordance with the second information, to perform inter-terminal direct communication with the terminal, or the other terminal selecting resources from among the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources includes the first resources, or the other terminal selecting resources other than the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources does not include the first resources.

2. The terminal according to claim 1, wherein the control section includes resources in which sidelink communication is not performed in the first resources or the second resources.

3. A communication method performed by a terminal, having the steps of: receiving first information indicating resources used in scheduled uplink transmission; deciding, from a set of candidate resources, first resources not used in uplink transmission and second resources used in uplink transmission, in accordance with the first information; and transmitting second information about the first resources or the second resources to another terminal, the other terminal selecting resources from among resources in a set of resources excluding the second resources from a set of its own candidate resources, in accordance with the second information, to perform inter-terminal direct communication with the terminal, or the other terminal selecting resources from among the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources includes the first resources, or the other terminal selecting resources other than the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources does not include the first resources.

4. A communication system including a terminal and a base station, wherein the terminal has: a reception section that receives first information indicating resources used in scheduled uplink transmission; a control section that decides, from a set of candidate resources, first resources not used in uplink transmission and second resources used in uplink transmission, in accordance with the first information; and a transmission section that transmits second information about the first resources or the second resources to another terminal, the other terminal selecting resources from among resources in a set of resources excluding the second resources from a set of its own candidate resources, in accordance with the second information, to perform inter-terminal direct communication with the terminal, or the other terminal selecting resources from among the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources includes the first resources, or the other terminal selecting resources other than the first resources to perform the inter-terminal direct communication with the terminal in a case where the set of its own candidate resources does not include the first resources. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ In a case where the other terminal does not include the first resource in the set of the own candidate resources, the other terminal selects a resource other than the first resource to perform the inter-terminal direct communication with the terminal, The base station has a transmission unit that transmits the first information to the terminal.

Images