Terminal and communication method

Abstract

A terminal is provided with: a reception unit that receives a broadcast signal from another terminal; and a transmission unit that transmits a signal requesting to be subordinate to the other terminal on the basis of the broadcast signal, and the reception unit receives a notification to be subordinate from the other terminal.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal and a communication method in a wireless communication system. 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 with each other without going through a base station is being studied (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 (registered trademark) (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, the 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 is possible, and D2D communication (also referred to as D2D direct communication, D2D communication, terminal-to-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, it is simply referred to as D2D. Further, 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 studied (for example, Non-Patent Literature 2).

[0005] Further, in NR Release 17 (for example, Non-Patent Literature 3), the use of a higher frequency band than the past releases is being studied. For example, applicable numerologies including subcarrier spacing, channel bandwidth, and the like, design of a physical layer, obstacles assumed in actual wireless communication, and the like in a frequency band of 52.6 GHz to 71 GHz are being studied.

[0006] In a newly used frequency band in which a higher frequency than ever before is used, an unlicensed band is defined. In the unlicensed band, various rules are defined, for example, LBT (Listen before talk) is performed at the time of channel access (for example, Non-Patent Literature 4). In the case where D2D communication is performed in the high frequency band, an action that conforms to the rules in the unlicensed band is required.

[0007] Prior Art Documents

[0008] Non-Patent Literature

[0009] Non-Patent Literature 1: 3GPP TS 38.211 V17.4.0 (2022-12)

[0010] Non-Patent Literature 2: 3GPP TR 22.886 V16.2.0 (2018-12)

[0011] Non-Patent Literature 3: 3GPP TS 38.306 V17.3.0 (2022-12)

[0012] Non-Patent Literature 4: 3GPP TS 37.213 V17.4.0 (2022-12) SUMMARY

[0013] Problems to be Solved by the Invention

[0014] In NR sidelink, as a resource decision method, mode 1 in which a base station schedules resource allocation to a terminal and mode 2 in which a terminal autonomously selects a resource are defined. In the future, in order to realize sidelink communication for various UE types for use cases for various qualities, it is envisaged that network-based efficient control will be introduced.

[0015] The present invention was made in view of the above-described aspect, and aims to realize efficient sidelink communication based on network-based control.

[0016] Means for Solving the Problems

[0017] According to the disclosed technology, a terminal is provided with a reception unit that receives a broadcast signal from another terminal, and a transmission unit that transmits a signal requesting to become a subordinate to the other terminal based on the broadcast signal, the reception unit receiving a notification of becoming a subordinate from the other terminal.

[0018] Effects of the Invention

[0019] According to the disclosed technology, efficient sidelink communication can be realized based on network-based control. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a diagram for explaining V2X.

[0021] Figure 2 is a timing chart illustrating an action example (1) of V2X.

[0022] Figure 3 is a timing chart illustrating an action example (2) of V2X.

[0023] Figure 4 is a timing chart illustrating an action example (3) of V2X.

[0024] Figure 5 is a timing chart illustrating an action example (4) of V2X.

[0025] Figure 6 is a diagram illustrating an example of a sensing action.

[0026] Figure 7 is a flowchart for explaining an example of a preemption action.

[0027] Figure 8 is a diagram illustrating an example of a preemption action.

[0028] Figure 9 is a diagram illustrating an example of a partial sensing action.

[0029] Figure 10 is a diagram for explaining an example of periodic partial sensing.

[0030] Figure 11 is a diagram for explaining an example of continuous partial sensing.

[0031] Figure 12 is a diagram illustrating an example of a frequency range in an embodiment of the present application.

[0032] Figure 13 is a diagram for explaining an example (1) of LBT.

[0033] Figure 14 is a diagram for explaining an example (2) of LBT.

[0034] Figure 15 is a diagram for explaining an example (3) of LBT.

[0035] Figure 16 is a diagram for explaining an example (1) of wideband domain operation.

[0036] Figure 17 is a diagram for explaining an example (2) of wideband domain operation.

[0037] Figure 18 is a diagram for explaining an example (3) of wideband domain operation.

[0038] Figure 19is a diagram for explaining an example (4) of a wideband domain application.

[0039] Figure 20 is a diagram for explaining an example of a communication situation in the embodiment of the present application.

[0040] Figure 21 is a flowchart for explaining an example (1) of communication in the embodiment of the present application.

[0041] Figure 22 is a flowchart for explaining an example (2) of communication in the embodiment of the present application.

[0042] Figure 23 is a diagram showing an example of a functional structure of the base station 10 in the embodiment of the present application.

[0043] Figure 24 is a diagram showing an example of a functional structure of the terminal 20 in the embodiment of the present application.

[0044] Figure 25 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.

[0045] Figure 26 is a diagram showing an example of a structure of the vehicle 2001 in the embodiment of the present application. DETAILED DESCRIPTION

[0046] Hereinafter, an embodiment of the present application will be described with reference to the drawings. Note that the embodiment described below is merely an example, and the embodiment to which the present application is applied is not limited to the embodiment described below.

[0047] In the operation of the wireless communication system in the embodiment of the present application, a related art is appropriately used. The related art is, for example, the existing LTE, but is not limited to the existing LTE. Further, unless otherwise specified, the term "LTE" used in the present specification is assumed to have 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.

[0048] Further, in the embodiment of the present application, the duplex mode can be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or a mode other than these (for example, a flexible duplex mode, etc.).

[0049] 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.

[0050] Figure 1 is a diagram for explaining V2X. In 3GPP, a technology for realizing V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending a 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 communication form between vehicles, V2I (Vehicle to Infrastructure) indicating a communication form between a vehicle and a road-side unit (RSU: Road-Side Unit) provided on the side of a road, V2N (Vehicle to Network) indicating a communication form between a vehicle and an ITS server, and V2P (Vehicle to Pedestrian) indicating a communication form between a vehicle and a mobile terminal held by a pedestrian.

[0051] 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.

[0052] With respect to V2X of LTE or NR, it is assumed that research not limited to 3GPP specifications will be promoted in the future. For example, it is assumed that research for ensuring interoperability, reduction of costs based on high-level implementation, a method for using or switching a plurality of RATs (Radio Access Technology), support of regulations of each country, data acquisition, distribution, database management, and a method for using a V2X platform of LTE or NR will be performed.

[0053] In the embodiment of the present application, a form 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 form. 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.

[0054] In addition, SL (Sidelink) can also be distinguished according to any one or a combination of UL (Uplink) or DL (Downlink) and the following 1) to 4). In addition, SL can also be other names.

[0055] 1) Resource configuration in time domain

[0056] 2) Resource configuration in frequency domain

[0057] 3) Synchronization signal to be referred to (including SLSS (Sidelink Synchronization Signal))

[0058] 4) Reference signal used for path loss measurement for transmission power control

[0059] 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, and OFDM with transform precoding can also be applied.

[0060] 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.

[0061] 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.

[0062] 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 categories 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.

[0063] Furthermore, in NR-SL, it is assumed that HARQ (Hybrid automatic repeat request) is supported in unicast and groupcast of sidelink. Also, in NR-V2X, SFCI (Sidelink Feedback Control Information) including HARQ-ACK is defined. Also, it is under study that SFCI is transmitted via PSFCH (Physical Sidelink Feedback Channel).

[0064] In addition, in the following description, it is assumed that PSFCH is used in transmission of HARQ-ACK based on sidelink, but this is only an example. For example, transmission of HARQ-ACK in sidelink can be performed using PSCCH, transmission of HARQ-ACK in sidelink can be performed using PSSCH, and transmission of HARQ-ACK in sidelink can be performed using another channel.

[0065] Hereinafter, for convenience of explanation, all 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. Furthermore, more specifically, a codebook applied to 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.

[0066] Figure 2 is a timing chart showing an example (1) of the operation of V2X. As shown inFigure 2 The wireless communication system of the embodiment of the present application can have a terminal 20A and a terminal 20B, as shown. In addition, there are actually a plurality of user devices, but Figure 2 The terminal 20A and the terminal 20B are shown as examples.

[0067] Hereinafter, without particularly distinguishing the terminal 20A, 20B, and the like, only "terminal 20" or "user device" is written. In Figure 2 In the present embodiment, as an example, a case where both the terminal 20A and the terminal 20B are in the coverage of a cell is shown, but the operation in the embodiment of the present application can also be applied to a case where the terminal 20B is out of coverage.

[0068] 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 or the like). In addition, the terminal 20 can also be an RSU. The 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.

[0069] 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.

[0070] 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 and modulates a codeword of the transmission data 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, a complex-valued time-domain SC-FDMA signal), and are transmitted from each antenna port.

[0071] 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, and the like). In addition, the base station 10 can also be an RSU (gNB type RSU).

[0072] 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.

[0073] As a synchronization signal in the SL, the terminal 20 transmits a Sidelink Synchronization Signal Block (S-SSB). The S-SSB can include a Sidelink Primary Synchronization Signal (S-PSS), a Sidelink Secondary Synchronization Signal (S-SSS), and a Physical Sidelink Broadcast Channel (PSBCH). Note that the names of the S-SSB, the S-PSS, the S-SSS, and the like are examples, and names other than the S-SSB, the S-PSS, the S-SSS, and the like can be used.

[0074] The terminal 20 transmits the S-SSB to another terminal 20 on the basis of a signal received from the base station device 10, a GNSS (Global Navigation Satellite System) signal, or a signal received from another terminal 20. Further, in a case where the terminal 20 cannot transmit the S-SSB on the basis of any of the signals of the base station device 10, the GNSS, and another terminal 20, the terminal 20 can also transmit the S-SSB autonomously decided to another terminal 20. The resource available for the S-SSB can be a periodic slot, and can also be referred to as an S-SSB occasion.

[0075] In step S101, the terminal 20A autonomously selects resources used for the PSCCH and the PSSCH from a resource selection window having a predetermined period. The resource selection window can also be set by the base station 10 to the terminal 20. Here, the predetermined period of the resource selection window can be determined in accordance with a processing time or a packet maximum allowed delay time, which is a condition of implementation of the terminal, or can be determined in accordance with a specification, and the predetermined period can also be referred to as an interval in the time domain.

[0076] In step S102 and step S103, the terminal 20A transmits SCI (Sidelink Control Information) using the PSCCH and / or PSSCH, and transmits SL data using the PSSCH, using the resource autonomously selected in step S101. For example, the terminal 20A can transmit the PSCCH using the frequency resource adjacent to or not 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.

[0077] The terminal 20B receives the SCI (PSCCH and / or PSSCH) and the SL data (PSSCH) transmitted from the terminal 20A. In the received SCI, resource information of the PSFCH for the terminal 20B to transmit HARQ-ACK for the data reception can be included. The terminal 20A can transmit the resource information autonomously selected in the SCI. In addition, the resource available for the PSFCH can be a symbol at the end in a periodic slot (except for the final symbol), and can also be referred to as a PSFCH occasion.

[0078] In step S104, 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.

[0079] In a case where the HARQ-ACK received in step S104 indicates a case where retransmission is requested, that is, a case where it is NACK (negative acknowledgement), 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 resource autonomously selected.

[0080] In addition, in a case where HARQ control accompanying HARQ feedback is not performed, step S104 and step S105 can also not be performed.

[0081] Figure 3 is a timing chart showing an example (2) of the operation of V2X. Blind retransmission that is not related to HARQ control for improving the success rate of transmission or the distance of arrival can also be performed.

[0082] In step S201, the terminal 20A autonomously selects a resource used for 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.

[0083] In step S202 and step S203, the terminal 20A transmits the SCI using the PSCCH and / or the PSSCH, and transmits the SL data using the PSSCH, using the resource autonomously selected in step S201. 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.

[0084] In step S204, the terminal 20A retransmits the SCI based on the PSCCH and / or the PSSCH and the SL data based on the PSSCH to the terminal 20B using the resource autonomously selected in step S201. The retransmission in step S204 can also be performed multiple times.

[0085] In addition, step S204 can also not be performed without performing the blind retransmission.

[0086] Figure 4 is a timing chart illustrating Action Example (3) of V2X. The base station 10 can perform scheduling of sidelink. That is, the base station 10 can decide a resource of sidelink used by the terminal 20, and transmit information indicating the resource 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 a resource of PSFCH to the terminal 20.

[0087] In step S301, the base station 10 transmits DCI (Downlink Control Information) to the terminal 20A using the 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).

[0088] Further, a case is assumed in which, in step S301, the base station 10 also transmits DCI for DL scheduling (may also be referred to as DL assignment) to the terminal 20A using the PDCCH. Hereinafter, for convenience of explanation, the DCI for DL scheduling will be referred to as DL scheduling DCI (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.

[0089] In step S302 and step S303, the terminal 20A transmits SCI (Sidelink Control Information) using PSCCH and / or PSSCH, and transmits SL data using PSSCH, using the resources specified by the SL scheduling DCI. In addition, in the SL scheduling DCI, only the resources of the PSSCH can be specified. In this case, for example, the terminal 20A can transmit the PSCCH using the 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.

[0090] 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 PSFCH resources for the terminal 20B to transmit the HARQ-ACK for the data reception is included.

[0091] The resource information 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 resource information from the DL scheduling DCI or the SL scheduling DCI and includes it in the SCI. Alternatively, assuming that the resource information is not included in the DCI transmitted from the base station 10, the terminal 20A can autonomously include the resource information in the SCI and transmit it.

[0092] In step S304, the terminal 20B transmits the HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH determined from the received SCI.

[0093] In step S305, the terminal 20A transmits the HARQ-ACK using the PUCCH (Physical uplink control channel) resources specified by the DL scheduling DCI (or the SL scheduling DCI) at a timing (for example, a timing in units of slots) specified by the DL scheduling DCI (or the SL scheduling DCI), for example, and the base station 10 receives the HARQ-ACK. In the codebook of the HARQ-ACK, the HARQ-ACK received from the terminal 20B or the HARQ-ACK generated from the PSFCH that is not received, and the HARQ-ACK for the DL data can be included. 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 Release 16 of NR, the HARQ-ACK for the DL data is not included in the codebook of the HARQ-ACK.

[0094] In addition, in a case where HARQ control accompanied by HARQ feedback is not performed, step S304 and / or step S305 can also not be performed.

[0095] Figure 5 is a timing chart illustrating an action example (4) of V2X. As described above, in sidelink of NR, HARQ acknowledgement is supported to be transmitted through PSFCH. In addition, a format of PSFCH can use, for example, a format same as PUCCH (Physical Uplink Control Channel) format 0. That is, regarding the format of PSFCH, it can be a sequence-based format in which PRB (Physical Resource Block) size is 1, and ACK and NACK are identified according to a difference in sequence and / or cyclic shift. The format of PSFCH is not limited thereto. A resource of PSFCH can be configured in a symbol at the end of a slot or a plurality of symbols at the end. Further, it is previously specified whether or not to set a period N to the PSFCH resource. For the period N, it can be previously specified whether or not to set in units of a slot.

[0096] In Figure 5 , the vertical axis corresponds to the frequency domain, and the horizontal axis corresponds to the time domain. PSCCH can be configured in 1 symbol at the start of a 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. PSFCH can be configured in 1 symbol at the end of a slot, or can be configured in a plurality of symbols at the end of a slot. In addition, the above-described "start of a slot" and "end of a 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 1 slot is configured by 14 symbols, the "start of a slot" and the "end of a slot" can also refer to symbols at the start and the end, respectively, among 12 symbols other than the symbols at the start and the end. In Figure 5 , 3 sub-channels are set in a resource pool, and 2 PSFCHs are configured after 3 slots in which PSSCH is configured. An arrow from PSSCH to PSFCH indicates an example of PSFCH associated with PSSCH.

[0097] In a case where HARQ acknowledgement in groupcast of NR-V2X is groupcast option 2 in which ACK or NACK is transmitted, it is necessary to decide a resource used in transmission and reception of PSFCH. As Figure 5As shown, in step S401, terminal 20A, acting as the transmitting terminal 20, performs multicast to terminals 20B, 20C, and 20D, acting as the receiving terminal 20, via SL-SCH (Sidelink Shared Channel). In the following step S402, terminal 20B sends a HARQ response to terminal 20A using PSFCH#B, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D. Here, as... Figure 5 As shown in the example, when the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to decide how to allocate the PSFCH resources. Additionally, the sending terminal 20 can also know the number of receiving terminals 20 in the multicast. Furthermore, in multicast option 1, only NACK is sent as a HARQ response, without sending ACK.

[0098] Figure 6 This diagram illustrates an example of monitoring actions in NR. In resource allocation mode 2, terminal 20 selects resources for transmission. For example... Figure 6 As shown, terminal 20 performs monitoring within a monitoring window of the resource pool. Through monitoring, terminal 20 receives the resource reservation or resource assignment fields contained in the SCI sent from other terminals 20, and identifies available resource candidates within the resource selection window of the resource pool based on these fields. Then, terminal 20 randomly selects a resource from the available resource candidates.

[0099] In addition, such as Figure 6 As shown, the resource pool can be configured with a period. For example, the period could be a duration of 10240 milliseconds. Figure 6 It is time slot t0 SL to time slot t Tmax-1 SL An example of something being set up as a resource pool. The regions of the resource pool within each period can be defined, for example, using a bitmap.

[0100] In addition, such as Figure 6 As shown, assume that the transmission trigger in terminal 20 occurs in time slot n, and the priority of this transmission is p. TX From time slot n-T0 to time slot nT proc，0 Within the monitoring window up to the immediately preceding time slot, terminal 20 can detect, for example, other terminals 20 performing priority p. RXThe transmission is processed. If an SCI is detected within the monitoring window and the RSRP (Reference Signal Received Power) exceeds a threshold, resources within the resource selection window corresponding to that SCI are excluded. Conversely, if an SCI is detected within the monitoring window and the RSRP is less than a threshold, resources within the resource selection window corresponding to that SCI are not excluded. This threshold may be, for example, based on priority p. TX and priority p RX Thresholds Th set or defined for each resource within the monitoring window pTX，pRX .

[0101] In addition, such as Figure 6 The time slot t shown m SL In this way, for example, resources in the resource selection window that are candidates for resource reservation information corresponding to resources in the monitoring window used for sending but not monitoring are excluded.

[0102] like Figure 6 As shown, in the resource selection window from time slot n+T1 to time slot n+T2, resources occupied by other UEs are identified, and resources that have been excluded become available resource candidates. Let S be the set of available resource candidates. A Then in S A Even if the resource selection window is less than 20%, the threshold Th set for each resource in the monitoring window can still be applied. pTX，pRX Increase by 3dB and then perform resource identification again. That is, it is also possible to do so by setting the threshold Th... pTX，pRX The resource identification process is repeated, increasing the number of resources not excluded due to RSRP being less than a threshold, thus expanding the resource candidate set S. A It accounts for more than 20% of the resource selection window. In S A If the resource selection window is less than 20%, the threshold Th set for each resource in the monitoring window can be repeatedly applied. pTX，pRX The resource identification action is performed again after the value increases by 3dB.

[0103] The lower layer of terminal 20 can S A Report to higher management. Higher management at Terminal 20 can access S... A A random selection process is performed to determine the resources to be used. Terminal 20 can then use the determined resources to perform sidelink transmissions. For example, the higher layer could be the MAC layer, and the lower layer could be the PHY layer or the physical layer.

[0104] In the above Figure 6In the above, the operation of the transmission-side terminal 20 is explained, but the reception-side terminal 20 can also detect data transmission from other terminals 20 according to the result of monitoring or partial monitoring, and receive data from the other terminals 20.

[0105] Figure 7 is a flowchart illustrating an example of preemption in NR. Figure 8 is a diagram illustrating an example of preemption in NR. In step S501, the terminal 20 performs monitoring in the monitoring window. In the case where the terminal 20 is performing a power saving operation, the monitoring can be performed for a limited period of time specified in advance. Next, the terminal 20 identifies each resource within the resource selection window according to the monitoring result, decides a set S A of resource candidates, and selects a resource to be used in transmission (S502). Next, the terminal 20 selects a resource set (r_0, r_1,...) to be judged for preemption from the set S A of resource candidates (S503). The resource set can be notified from a higher layer to a PHY layer as a judgment of whether the resource is preempted or not.

[0106] In step S504, the terminal 20 re-identifies each resource within the resource selection window according to the monitoring result at the timing of T(r_0)-T3 shown in Figure 8 , decides a set S A of resource candidates, and further judges preemption for the resource set (r_0, r_1,...) according to the priority. For example, through the re-monitoring, Figure 8 , r_1 is detected as SCI transmitted from another terminal 20, and is not included in S A . In the case where preemption is valid, when a value prio_RX representing the priority of the SCI transmitted from another terminal 20 is lower than a value prio_TX representing the priority of the transport block transmitted from the own terminal, the terminal 20 judges that the resource r_1 is preempted. Note that the lower the value representing the priority, the higher the priority. That is, in the case where a value prio_RX representing the priority of the SCI transmitted from another 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 the 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 the case where a value prio_RX representing the priority of the SCI transmitted from another 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 judges that the resource r_1 is preempted.

[0107] In step S505, the terminal 20, in a case where it is determined that preemption in step S504, notifies the preemption to a higher layer, reselection of resources is performed in the higher layer, and the check of preemption ends.

[0108] In addition, in a case where re-evaluation is performed instead of the check of preemption, the set S of resource candidates is decided in the above step S504 A After that, in a case where the resources do not include the resource set (r_0, r_1,...) in S A , the resources are not used, and reselection of resources is performed in the higher layer.

[0109] Figure 9 is a diagram illustrating an example of partial monitoring action in LTE. In a case where partial monitoring is set from a higher layer in LTE sidelink, as illustrated in Figure 9 , the terminal 20 selects and transmits resources. As illustrated in Figure 9 , the terminal 20 performs partial monitoring on a part of a monitoring window in a resource pool, that is, a monitoring target. Through the partial monitoring, the terminal 20 receives a resource reservation field included in SCI transmitted from other terminals 20, and identifies usable resource candidates in a resource selection window in the resource pool from the field. Next, the terminal 20 randomly selects a resource from the usable resource candidates.

[0110] Figure 9 is an example in which a resource pool is set from a subframe t0 SL to a subframe t Tmax-1 SL . An object region of the resource pool can be set, for example, by a bitmap. As illustrated in Figure 9 , it is assumed that a transmission trigger in the terminal 20 occurs in a subframe n. As illustrated in Figure 9 , Y subframes from a subframe t y1 SL to a subframe t yY SL in a subframe n+T1 to a subframe n+T2 can be set as a resource selection window.

[0111] The terminal 20 can detect that, for example, other terminals 20 are transmitting in one or a plurality of monitoring targets that are subframes t y1-k×Pstep SL to a subframe t yY-k×Pstep SL . k can be decided by a 10-bit bitmap, for example. In Figure 9 , an example in which the 3rd and 6th bits of the bitmap are set to "1" indicating that partial monitoring is performed is illustrated. That is, in Figure 9 , Y subframes from a subframe t y1-6×Pstep SL to a subframe tyY-6×Pstep SL and from subframe t y1-3×Pstep SL To subframe t yY-3×Pstep SL It is set as a monitoring target. As mentioned above, the k-th bit of the bitmap can correspond to the subframe t. y1-k×Pstep SL To subframe t yY-k×Pstep SL The monitoring window. In addition, y i Corresponding to the index (1...Y) within the Y subframe.

[0112] In addition, k is set or predefined through a 10-bit bitmap, and P step It can be 100ms. However, when using DL and UL carriers for SL communication, P step It can be set to (U / (D+S+U))*100ms. U corresponds to the number of UL subframes, D corresponds to the number of DL subframes, and S corresponds to the number of special subframes.

[0113] If an SCI is detected at the aforementioned monitoring target and the RSRP exceeds a threshold, resources within the resource selection window corresponding to the resource reservation field of that SCI are excluded. Conversely, if an SCI is detected at the monitoring target and the RSRP is less than a threshold, resources within the resource selection window corresponding to the resource reservation field of that SCI are not excluded. This threshold could, for example, be based on the sending-side priority p. TX and receiving side priority p RX Thresholds Th set or defined for each resource within the monitoring target pTX，pRX .

[0114] like Figure 10 As shown, within the resource selection window designated as Y subframes in the interval [n+T1, n+T2], terminal 20 identifies resources occupied by other UEs, and resources excluding those resources become available resource candidates. Furthermore, Y subframes can be discontinuous. If the set of available resource candidates is set as S... A Then in S A Even if the resources are less than 20% of the resources in the resource selection window, the threshold Th set for each resource according to the monitoring target can still be applied. pTX，pRX The resource identification process is repeated after a 3dB increase.

[0115] That is, it can also be achieved by setting the threshold Th pTX，pRX The resource identification process is repeated upon raising the threshold, thereby increasing the number of resources that were not excluded due to RSRP being less than the threshold. Furthermore, S can also be measured. A The RSSI of each resource is calculated, and the resource with the smallest RSSI is added to set S. BS A The RSSI-minimum resource included in S B is added to S B until the set S B of resource candidates becomes 20% or more of the resource selection window.

[0116] The lower layer of the terminal 20 can report S B to the upper layer. The upper layer of the terminal 20 can perform random selection to decide the resource to be used. The terminal 20 can perform sidelink transmission using the decided resource. In addition, the terminal 20 can periodically use the resource without monitoring in a predetermined number of times (e.g., C resel times) once the resource is secured.

[0117] In NR sidelink, power saving based on random resource selection and partial sensing is standardized. The terminal 20 to which partial sensing is applied performs reception and monitoring only in specific slots within the monitoring window. That is, the terminal 20 can also perform identification of resources by monitoring only a limited number of resources compared to full monitoring, and perform partial sensing of resource selection from the identified resource set. In addition, the terminal 20 can not exclude resources from the resources within the resource selection window, but perform random selection of resource selection from the identified resource set as the identified resource set within the resource selection window.

[0118] In addition, at the time of resource selection, random selection is performed, and the method of using monitoring information at the time of reevaluation or preemption check can be handled as partial sensing or as random selection.

[0119] In addition, as an action in monitoring, 1) and 2) shown below can also be applied. In addition, monitoring (sensing) and monitoring (monitoring) can be replaced with each other, and at least one of reception of RSRP measurement, acquisition of reservation resource information, and acquisition of priority information can be included in the action.

[0120] 1) Periodic-based partial sensing

[0121] In the mechanism of monitoring only a part of the slots, the action of deciding the monitoring slots based on the reservation periodicity. In addition, the reservation periodicity is a value associated with the resource reservation period field. In addition, the period can also be periodically replaced.

[0122] 2) Contiguous partial sensing

[0123] In the mechanism of monitoring only a part of the slots, an action of monitoring a slot is decided based on aperiodic reservation. In addition, the aperiodic reservation is a value associated with a time resource assignment field.

[0124] Further, a plurality of resource allocation methods can be set for a certain resource pool. Further, as one of the power saving functions, SL-DRX (Discontinuous reception) is supported. That is, a reception action is performed only in a predetermined time interval.

[0125] As described above, partial sensing is supported as one of the power saving functions. In a resource pool in which partial sensing is set, the terminal 20 can perform the above-described periodic partial sensing. The terminal 20 can receive information for setting a resource pool from the base station 10, the resource pool being set with partial sensing and a periodic reservation being set as valid.

[0126] Figure 10 is a diagram for explaining an example of periodic partial sensing (sensing). As shown in Figure 11 Y candidate slots for resource selection are selected from a resource selection window [n+T1, n+T2].

[0127] t y SL may be set as one slot included in the Y candidate slots, t y-k×Preserve SL monitoring is performed as a periodic partial sensing target slot.

[0128] P reserve may correspond to all values included in a set sl-ResouceReservePeriodList set or predefined. Alternatively, a value of P reserve may be set or predefined to be limited to a subset of sl-ResouceReservePeriodList. P reserve and sl-ResouceReservePeriodList can be set for each transmission resource pool of resource allocation mode 2. Further, as a UE implementation, a period included in sl-ResouceReservePeriodList other than the limited subset can also be monitored. For example, the terminal 20 can also monitor the timing corresponding to P_RSVP_Tx additionally.

[0129] Regarding the value of k, terminal 20 can monitor the latest monitoring opportunity in a reserved period prior to the resource selection trigger time slot n, or prior to the start time slot of the Y candidate time slots subject to processing time constraints. Furthermore, terminal 20 can also additionally monitor periodic monitoring opportunities corresponding to a set of more than one k value. For example, as the k value, a value corresponding to the latest monitoring opportunity in a reserved period prior to the resource selection trigger time slot n, or prior to the start time slot of the Y candidate time slots subject to processing time constraints, and a value corresponding to the monitoring opportunity immediately preceding the latest monitoring opportunity in that reserved period can be set.

[0130] As described above, partial monitoring is supported as one of the power-saving functions. In a resource pool with partial monitoring configured, terminal 20 can perform the aforementioned continuous partial monitoring. Terminal 20 can receive information from base station 10 for configuring a resource pool, wherein partial monitoring is configured and non-periodic reservation is enabled.

[0131] Figure 11 This is a diagram used to illustrate an example of continuous monitoring. For example... Figure 11 As shown, when the resource selection trigger is set to time slot n, terminal 20 selects Y candidate time slots for resource selection from the resource selection window [n+T1, n+T2]. Figure 11 This is an example of the case where Y=7. For example... Figure 12 As shown, the start of the Y candidate time slots is denoted as time slot t. y1 Let the next time slot be t. y2 ..., denote the last of the Y candidate time slots as time slot t. yY .

[0132] Terminal 20 in the interval [n+T A n+T B Monitoring will be conducted at n+T B or n+T B Later (let's call it n+T) C ) Perform resource selection. Additionally, the aforementioned periodic monitoring can also be performed. Furthermore, the interval [n+T] A n+T B ] of T A and T B It can be any value. Furthermore, n can also be replaced with the index of any of the Y candidate time slots.

[0133] Additionally, the symbol [ can be replaced with the symbol (, and the symbol ] can be replaced with the symbol . Furthermore, for example, the interval [a, b] is the interval from time slot a to time slot b, including time slot a and time slot b. For example, the interval (a, b) is the interval from time slot a to time slot b, excluding time slot a and time slot b.

[0134] In addition, the candidate resources that are the objects of resource selection are described as Y candidate slots, but all of the slots in the interval [n+T1, n+T2] can be candidate slots, or a part of the slots can be candidate slots.

[0135] Furthermore, as a method of improving reliability and delay performance, inter-terminal coordination is standardized. For example, Inter-Terminal Coordination Method 1 and Inter-Terminal Coordination Method 2 shown below are standardized. Hereinafter, the terminal 20 that transmits coordination information is described as UE-A, and the terminal 20 that receives coordination information is described as UE-B.

[0136] Inter-Terminal Coordination Method 1) From UE-A to UE-B, a set of preferred resources and / or a set of non-preferred resources for transmission by UE-B are transmitted. Hereinafter, Inter-Terminal Coordination Method 1 is also described as IUC Scheme 1 (Inter-UE coordination scheme 1).

[0137] Inter-Terminal Coordination Method 2) UE-A transmits to UE-B information indicating resources in which a collision with other transmission or reception is expected and / or resources in which a collision is detected, in resources indicated by SCI received from UE-B. This information can be transmitted via PSFCH. Hereinafter, Inter-Terminal Coordination Method 2 is also described as IUC Scheme 2 (Inter-UE coordination scheme 2).

[0138] 3GPP Release 16 or Release 17 sidelink has 1) and 2) shown below as objects.

[0139] 1) An environment in which only 3GPP terminals exist in the ITS (Intelligent Transport Systems: Intelligent Transport Systems) band

[0140] 2) An environment in which it is possible to use UL resources for SL in the licensed band of FR1 (Frequency range 1: Frequency range 1) and FR2 defined by NR

[0141] As a sidelink after 3GPP Release 18, it is being studied to newly take unlicensed bands as objects. For example, unlicensed bands such as the 5 GHz-7 GHz band, the 60 GHz band, and the like.

[0142] Figure 12 is an example of a diagram showing a frequency band used in a wireless communication system. In the NR specification of 3GPP Release 15 and Release 16, it is studied to use, for example, a frequency band of 52.6 GHz or more. In addition, as shown inFigure 12 As shown, it is stipulated that the FR (Frequency range) 1 of the present status of use is a frequency band from 410 MHz to 7.125 GHz, the SCS (Sub carrier spacing) is 15, 30, or 60 kHz, and the bandwidth is from 5 MHz to 100 MHz.

[0143] The FR2-1 is a frequency band from 24.25 GHz to 52.6 GHz, the SCS uses 60, 120, or 240 kHz, and the bandwidth is from 50 MHz to 400 MHz. As shown, the FR2-2 can also be envisaged as 52.6 GHz to 71 GHz. Also, it can be envisaged that a frequency band exceeding 71 GHz is supported. Figure 13

[0144] In the case of using a frequency band exceeding 52.6 GHz, it is possible to apply a Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM: Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / Discrete Fourier Transform-Spread OFDM (DFT-S-OFDM: Discrete Fourier Transform-Spread OFDM) with a larger Sub-Carrier Spacing (SCS).

[0145] In addition, in a high frequency band such as the FR2-2, an increase in phase noise between carriers becomes a problem. Therefore, it can be necessary to apply a larger (wider) SCS or a single carrier waveform.

[0146] For example, as an example of an unlicensed band in the 5 GHz-7 GHz band, 5.15 GHz to 5.35 GHz, 5.47 GHz to 5.725 GHz, 5.925 GHz or more, and the like are envisaged.

[0147] For example, as an example of an unlicensed band in the 60 GHz band, 59 GHz to 66 GHz, 57 GHz to 64 GHz or 66 GHz, 59.4 GHz to 62.9 GHz, and the like are envisaged.

[0148] In the unlicensed band, in order not to cause an impact on other systems or other devices, various rules are stipulated.

[0149] ​For example, in the 5GHz-7GHz band, LBT (Listen before talk) is performed at channel access. The base station 10 or the terminal 20 performs power detection for a predetermined period before transmission, and in a case where the power exceeds a certain value, that is, in a case where transmission of another device is detected, transmission is suspended (also referred to as LBT failure). In addition, the maximum channel occupancy time (MCOT) is specified. The MCOT is the maximum time interval that is allowed to continue transmission in a case where transmission is started after LBT, and for example, 4 ms in Japan.

[0150] In addition, as an occupied channel bandwidth (OCB) requirement, in a case where transmission is performed using a certain carrier bandwidth, it is necessary to use X% or more of the band. For example, in Europe, 80% to 100% of the NCB (Nominal channel bandwidth) is required to be used. The purpose of the OCB requirement is to correctly perform power detection for channel access.

[0151] In addition, with respect to the maximum transmission power, the maximum power spectral density, in order to avoid excessive interference, it is specified to perform transmission below a predetermined transmission power. For example, in Europe, 23 dBm becomes the maximum transmission power in the 5150MHz-5350MHz band. In addition, for example, in Europe, 10 dBm / MHz becomes the maximum power spectral density in the 5150MHz-5350MHz band.

[0152] For example, in the 60GHz band, LBT is performed at channel access. The base station 10 or the terminal 20 performs power detection for a predetermined period before transmission, and in a case where the power exceeds a certain value, that is, in a case where transmission of another device is detected, transmission is suspended. In addition, with respect to the maximum transmission power, the maximum power spectral density, it is specified to perform transmission below a predetermined transmission power. In addition, it is specified to have a capability that satisfies the OCB requirement.

[0153] In NR, based on the difference in the time direction behavior (period of monitoring) of LBT, four types of channel access procedures shown below are specified. In addition, this monitoring is a different action from the above-described sidelink monitoring, and is described as LBT monitoring in order to distinguish.

[0154] Type 1) LBT monitoring of a variable time is performed before transmission. Also referred to as Category 4 LBT.

[0155] Type 2A) LBT monitoring of 25 μs is performed before transmission. Also called Category 2 LBT.

[0156] Type 2B) LBT monitoring of 16 μs is performed before transmission. Also called Category 2 LBT.

[0157] Type 2C) Transmission is started without LBT. Same as transmission of licensed band.

[0158] Figure 13 is a diagram for explaining Example (1) of LBT. Figure 13 is an example of channel access procedure of Type 1. Type 1 is further classified into 4 levels indicating Channel access priority class (CAPC) based on the difference of LBT monitoring length. LBT monitoring is performed in the following two periods.

[0159] The 1st period is Prioritization Period or defer duration, having a length of 16 + 9 x m p [μs]. m p A fixed value is prescribed for each channel access priority class.

[0160] The 2nd period is backoff procedure, having a length of 9 x N [μs]. The value of N is randomly decided from a certain range (refer to CWS adjustment procedure of Non-patent Literature 4). N is the initial value of backoff counter, and the value of backoff counter is decreased by 1 each time when there is no detection of the power of signal of other device in the period of 9 [μs].

[0161] In the above, the LBT monitoring period of 9 μs can also be called LBT monitoring slot period.

[0162] In the example of Figure 13 , m p = 3, and the defer duration is 43 μs. As shown in Figure 13 , the backoff counter is fixed when the channel is busy. Further, as shown in Figure 14 , in the case where error is detected due to the transmission collision of NR-U gNB and wireless LAN node #2, in the NR-U gNB, the Contention Window Size (CWS) is expanded from 3 to 13.

[0163] Figure 14 is a diagram for explaining Example (2) of LBT. Figure 15is an example of a channel access procedure of Type 2A or Type 2B without random backoff. Type 2A sets a gap of 25 μs for performing power detection before transmission, and Type 2B sets a gap of 16 μs for performing power detection before transmission.

[0164] Figure 15 is a diagram for explaining Example (3) of LBT. Figure 15 is an example of a channel access procedure of Type 2C. As shown in Figure 16 , power detection is not performed before transmission, and transmission is performed immediately after a gap of not more than 16 μs. The maximum transmission duration can be 584 μs.

[0165] As described above, a plurality of LBT types are supported in NR-U. In the above Type 1, the initial value N of the backoff counter is set to a random number from 0 to a value decided based on the channel access priority class p in the range of CW p . Table 1 shows an example of m p , the minimum value of CW p , the maximum value of CW p，min , and CW p prescribed for each channel access priority class p in UL. p，max

[0166] [Table 1]

[0167]

[0168] As shown in Table 1, m p , CW p，min , and CW p，max are decided according to the channel access priority class p. In the case where p is 1, if the LBT duration is calculated according to Table 1, the minimum is 34 μs and the maximum is 88 μs. In the case where p is 2, if the LBT duration is calculated according to Table 1, the minimum is 34 μs and the maximum is 160 μs. In the case where p is 3, if the LBT duration is calculated according to Table 1, the minimum is 43 μs and the maximum is 9286 μs. In the case where p is 4, if the LBT duration is calculated according to Table 1, the minimum is 79 μs and the maximum is 9286 μs. In addition, Table 1 is a table for UL.

[0169] The LBT type and the channel access priority class can also be decided based on a notification from the base station 10, the channel type, and the like. The gap of 25 μs or 16 μs can also be set by the scheduling of the base station 10 taking into account the TA (Timing Advance) and the CP extension.

[0170] ​LBT applied to channel access is performed per predetermined bandwidth (e.g., 20 MHz). Transmission can be performed in a case where no power is detected in the LBT channel including each transmission. On the other hand, each CC in Uu can be defined by a bandwidth wider than the LBT channel. That is, wideband operation is supported. In addition, Uu is a radio interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment).

[0171] Figure 17 is a diagram for explaining Example (1) of wideband operation. Figure 16 is a diagram for explaining Example (2) of wideband operation. In a case of wideband operation in an unlicensed band, as shown in Figure 17 or Figure 16 , LBT in the gNB can be permitted in the LBT channel in which LBT is successful when LBT in a part or all of the LBT channels is successful. The gNB can perform continuous transmission of a single block as shown in Figure 17 , or the gNB can perform transmission of a plurality of discontinuous blocks as shown in Figure 18 .

[0172] With respect to DL in an unlicensed band, DL Type A in which LBT is performed per channel and DL Type B in which LBT Type 1 is performed in a randomly selected channel and LBT Type 2A is performed in the remaining channels are specified.

[0173] DL Type A is further classified into Type A1 and Type A2. In Type A1, a contention window CWp is decided per channel. In Type A2, the largest CWp among CWps decided for each channel is used with respect to CWp.

[0174] DL Type B is further classified into Type B1 and Type B2. In Type B1, a single CWp is applied to all channels. In Type B2, the largest CWp among CWps decided for each channel is used.

[0175] In a case where LBT in a part or all of the LBT channels in the gNB is successful, PDSCH transmission in the LBT channel in which LBT is successful is permitted. The gNB can perform transmission of a single block that is continuous in the frequency direction, or the gNB can perform transmission of a plurality of blocks that are discontinuous in the frequency direction.

[0176] Figure 19 is a diagram for explaining Example (3) of wideband operation. Figure 18 is a diagram for explaining Example (4) of wideband operation. As shown inFigure 19 Or Figure 19 As shown in FIG. 6, when LBT in the UE succeeds in all LBT channels in the scheduled band, transmission can be permitted. As shown in FIG. 7, in the case where LBT fails in some of the LBT channels, transmission can not be permitted. Figure 20

[0177] For UL in the unlicensed band, the LBT type is decided according to the indication from the gNB. In the case where the LBT type 1 is indicated, the LBT type 2 is applied in the case where the same LBT as the DL type B is performed in the UL immediately before transmission, or the LBT type 1 is applied. In the case where LBT fails in any LBT channel for transmission, UL is not transmitted in all LBT channels. In addition, the LBT channel can also be referred to as a RB set. Also, the LBT channel and the RB set can be replaced with each other.

[0178] Here, in 5G-NR, the following two types are defined as the resource decision method for sidelink communication.

[0179] Mode 1: Resource allocation according to scheduling by the gNB.

[0180] A certain degree of communication quality can be obtained. However, it is difficult for the gNB to grasp all channel states, and thus it is not expected that the communication quality is the same as that of Uu, and there is a constraint that it must be in the coverage.

[0181] Mode 2: UE autonomously selects resources.

[0182] Communication can be performed in the same method regardless of the location in the coverage or out of the coverage. However, the communication quality is low, and the power consumption is large.

[0183] As described above, since there are disadvantages in sidelink communication, the development of products has not progressed. On the other hand, it is assumed that in the future, for various quality for various use cases, sidelink communication for various UE types is required. Therefore, it is considered that the resource allocation method is updated. In addition, it is assumed that the Uu coverage is significantly expanded by effective use of NTN (Non-Terrestrial Network).

[0184] Figure 20 is a diagram for explaining an example of a communication situation in an embodiment of the present application. As shown in FIG. 6, when LBT in the UE succeeds in all LBT channels in the scheduled band, transmission can be permitted. As shown in FIG. 7, in the case where LBT fails in some of the LBT channels, transmission can not be permitted. Figure 21 ​As shown, a certain UE (hereinafter referred to as "UE-X") can report information about its own device and other UEs (hereinafter referred to as "UE-Y (UE-Y1, UE-Y2,...)") to a base station 10 (hereinafter also referred to as "BS (Base station)"), and inform the UE-Y of information about sidelink communication with the UE-Y based on settings and instructions from the base station 10.

[0185] The UE-X is permitted by the BS to "act on the UE-Y", and the UE-Y can become a subordinate of the UE-X. The number N of the UE-Y can be 1 or more and N max The following. N max It can be decided based on the capability of the UE-X, or it can be decided based on the notification from the BS. In addition, the UE-Y becoming a subordinate of the UE-X can mean that the communication of the UE-Y is controlled by the UE-X, or it can mean that the UE-Y performs communication based on information received from the UE-X, or it can mean that the communication of the UE-Y is controlled by the BS via the UE-X, or it can mean that the UE-X and the UE-Y become a connected state in which the UE-X is permitted to act on the UE-Y in connection with the BS.

[0186] Regarding the sidelink communication, all information is also collected at the network operator side to control, but it can also include devices that do not perform 3GPP Uu communication, such as devices that do not have a SIM (Subscriber identity module). For example, the UE-Y can be a device that does not perform 3GPP Uu communication, a device that does not have a SIM. The sidelink communication can be performed by a combination of mode 1 resource allocation of 5G-NR and a function of scheduling other UEs by a certain UE.

[0187] The UE type of the UE-X and the UE-Y can be arbitrary. For example, the UE-X can be a smartphone, and the UE-Y can be a wearable device or a RedCap UE.

[0188] A Base Station (BS) can be a terrestrial base station or a non-terrestrial base station, such as a satellite or a High Altitude Platform Station (HAPS). Additionally, a BS can be replaced with core network functions or application layer functions. Core network functions can be, for example, policy control functions (PCF) or newly defined sidelink control functions, but are not limited to these. Application layer functions can be, for example, a V2X application server. When a BS is replaced with a core network function or an application layer function, the signaling between the UE and the BS, as described later, can be replaced with NAS (Nonaccess stratum) signaling. Furthermore, UE-X can be replaced with core network functions or application layer functions.

[0189] Through the above actions, various UE types, communication qualities, and use cases can be implemented in the side link. For example, it can realize IoT-UE, URLLC (Ultra-Reliable and Low Latency Communications), etc.

[0190] Figure 22 This is a flowchart illustrating an example (1) of communication in an embodiment of the present invention. In step S601, based on the communication between UE-X and BS, BS authorizes UE-X to perform "actions related to UE-Y". In the next step S602, based on the communication between UE-X and UE-Y, UE-Y is determined to be a subordinate of UE-X. UE-X, UE-Y, and / or BS can execute this decision. In the next step S603, based on the communication between UE-X and BS, sidelink communication is performed between UE-X and UE-Y or between multiple UE-Ys.

[0191] Figure 21 This is a flowchart illustrating example (2) of communication in an embodiment of the present invention. In step S701, based on the communication between UE-X and UE-Y, UE-Y is determined to be a subordinate of UE-X. UE-X, UE-Y, and / or BS can execute this determination. In the next step S702, based on the communication between UE-X and BS, BS authorizes UE-X to perform "actions related to UE-Y". In the next step S703, based on the communication between UE-X and BS, sidelink communication is performed between UE-X and UE-Y or between multiple UE-Ys.

[0192] The following explains the conditions for action 1) UE-X.

[0193] The condition under which a certain UE can become UE-X, i.e., the condition under which the UE can communicate with the BS and perform the "action related to UE-Y" based on the setting and indication from the BS with respect to the "action related to UE-Y" can be one or more of the following A) to F) or all of the following A) to F).

[0194] A) The UE can communicate with the BS. It can also be that the UE can communicate with the BS through a specific FR, cell, or carrier. With respect to the connection state with the BS, it can also be limited to the case where the UE can communicate with the BS with respect to the "action related to UE-Y" in a state other than RRC_CONNECTED.

[0195] B) The UE reports to the BS the execution capability of the "action related to UE-Y". The "action related to UE-Y" can be to control the transmission and / or reception of sidelink signals from UE-Y to UE-X and / or other UE-Y, or can be to receive an indication from the BS related to the transmission and / or reception of sidelink signals from UE-Y to UE-X and / or other UE-Y, and share the indication with one or more UE-Y.

[0196] C) In the UE, the identification of UE-Y that can be controlled by the own device has been completed.

[0197] D) The UE has a positioning function. It can also be limited to the case where it has a sidelink positioning function. It can also be limited to the case where it can measure the position information of UE-Y or the case where it can report the information for the position measurement of UE-Y.

[0198] E) The UE can measure and report information related to signals with respect to other UE-X or UE-Y subordinate to other UE-X (e.g., interference power).

[0199] F) The UE receives a notification related to the function (function of communicating with the BS and performing the "action related to UE-Y" based on the setting / indication from the BS with respect to the "action related to UE-Y") in the SIB. That is, it can also be that, in the case where the notification is not received, the UE cannot transmit a signal (e.g., an execution request) related to the function to the BS.

[0200] The above is a description of Action 1).

[0201] The following describes Action 2) a method in which UE-X is permitted by the BS to perform the "action related to UE-Y".

[0202] The UE-X can report at least one of the following A) to H) to the BS.

[0203] A) Information measured based on a signal received from a BS. For example, the information can be RSRP (Reference signal received power), RSRQ (reference signal received quality), RSSI (Received signal strength indicator), CQI (Channel quality indicator), CSI (Channel state information), etc.

[0204] B) Information measured based on a signal received from other UE. For example, the information can be RSRP, RSRQ, RSSI, CQI, CSI, etc.

[0205] C) Information measured based on a signal received from other UE-X. For example, the information can be RSRP, RSRQ, RSSI, CQI, CSI, etc.

[0206] D) Information related to a communication requirement between UE-X and subordinate UE-Y, or between subordinate UE-Ys. For example, the information can be priority, QoS indicator, etc.

[0207] E) Parameter required for a communication between UE-X and subordinate UE-Y, or between subordinate UE-Ys. For example, the parameter can be time and / or frequency resource, transmission power, resource period, etc.

[0208] F) Information related to UE-Y. For example, the information can be capability, UE type, number of UEs, etc.

[0209] G) Position information of UE-X and / or UE-Y, or information for position measurement of UE-X and / or UE-Y. For example, the information can be RX-TX time difference, RSRP, information associated with angle, etc.

[0210] H) Request for execution of "an action related to UE-Y".

[0211] The reporting of UE-X to a BS can be performed through at least one of the following signaling. RRC signaling, MAC signaling (e.g., MAC-CE), PHY signaling (e.g., UCI).

[0212] The priority of the reporting action can be determined by any one of the following A) - C).

[0213] A) It can be decided based on the priority in the communication between UE-X and subordinate UE-Y or between subordinate UE-Ys.

[0214] B) It can also use the priority determined based on the specification. For example, it can be a priority lower than CCCH (Common control channel), or a priority lower than MAC-CE of Uu communication.

[0215] C) It can use the priority set to the BS.

[0216] UE-X can receive information on permission or non-permission of "action related to UE-Y" from the BS, or can be performed by at least one of the following signaling. RRC signaling, MAC signaling (for example, MAC-CE), PHY signaling (for example, DCI).

[0217] UE-X can assume non-permission in a case where it attempts to receive permission information of "action related to UE-Y" from the BS but cannot receive it. UE-X can assume non-permission in a case where it does not receive permission information from the time of transmission of the execution request of "action related to UE-Y" to the time T elapses. Time T can apply a timer function defined in the RRC layer. UE-X can perform the execution request of "action related to UE-Y" again. The maximum number of execution of the execution request of "action related to UE-Y" can be defined, and in a case where the number of execution requests reaches the maximum number, the request can not be executed at least for a predetermined period.

[0218] UE-X can also receive at least one of the following information from the BS in addition to or instead of the information on permission or non-permission of "action related to UE-Y" from the BS. Available resources (time, frequency, and / or code), signal sequence, cell ID, maximum transmission power, priority that can be used for communication with UE-Y, achievable communication quality, information related to beam, area and / or position where "action related to UE-Y" can be performed, type that can be subordinate UE-Y, capability that can be subordinate UE-Y (for example, satisfy any of the conditions of UE-Y described later), area and / or position that can be subordinate UE-Y, action information of the BS and / or UE-X related to sidelink communication control of UE-Y.

[0219] The above is a description of Action 2).

[0220] The following describes Action 3) Conditions of UE-Y.

[0221] The conditions under which a certain UE can become UE-Y, i.e., based on a signal from UE-X (a signal of UE-X based on "an action related to UE-Y") and conditions under which UE-X and / or other UEs-Y perform sidelink communication can be at least one of A) - E) shown below.

[0222] A) has decided to become or can become a subordinate of UE-X through communication with UE-X. It can also be a condition under which a PC-5 RRC connection has been established between UE-X.

[0223] B) can perform communication (e.g., direct communication) with a BS. The BS can be the BS to which the UE-X of A) is connected, or can be a different BS from the BS to which the UE-X of A) is connected. It can also be a condition under which communication with the BS is possible through a specific FR, cell, or carrier. It can also be limited to the case where the BS permits the action of UE-Y.

[0224] C) cannot perform or does not perform communication (e.g., direct communication) with a BS. For example, it can also be a condition for a UE that does not have a SIM.

[0225] D) is not in a connected state with the BS. Reception of broadcast information from the BS can also be performed.

[0226] E) is a specific UE type. For example, it can also be an IoT-UE.

[0227] The above is a description of Action 3).

[0228] The following describes Action 4) the conditions under which UE-Y becomes a subordinate of UE-X.

[0229] In Action 4) of the above Figure 22 In Step S602, the action of UE-Y becoming a subordinate of UE-X can be performed by the following Steps 11) - 13).

[0230] Step 11) UE-X transmits a sidelink broadcast signal based on the information (e.g., sidelink resources that can be used) of "an action related to UE-Y" notified from the BS. The sidelink broadcast signal can include the information of "an action related to UE-Y" notified from the BS.

[0231] Step 12) UE-Y monitors and receives the sidelink broadcast signal from UE-X, and transmits a request to enter the subordinate of UE-X to UE-X based on the received information. The signal of the request can be, for example, a sequence signal, can be a PRACH for sidelink, or can be transmitted through a control channel and / or a shared channel. The information related to UE-Y shown in A) - E) below can also be transmitted to UE-X together with the signal of the request or in addition thereto.

[0232] A) information measured based on a signal received from UE-X. For example, the information can be RSRP, RSRQ, RSSI, etc.

[0233] B) information related to a requirement of communication between UE-X and the own device, or between other UE-Y and the own device. For example, the information can be priority, QoS indicator, etc.

[0234] C) parameters required for communication between UE-X and the own device, or between other UE-Y and the own device. For example, the parameters can be time and / or frequency resources, transmission power, resource period, etc.

[0235] D) capability, UE type, which BS or which PLMN (Public Land Mobile Network) to connect to, and / or whether to connect or not.

[0236] E) UE-Y location information, a signal for location measurement (e.g., reference signal), or information for location measurement (e.g., RX-TX time difference, RSRP, angle-related information, etc.).

[0237] Step 13) UE-X monitors and receives a request signal from UE-Y. UE-X sends a notification to UE-Y that UE-Y is subordinate to UE-Y based on the received information. UE-Y receives the notification.

[0238] In Figure 21 Step S701, the action of UE-Y becoming subordinate to UE-X can be performed by the following steps 21) to 23).

[0239] Step 21) UE-X transmits a sidelink broadcast signal using an initial communication resource before deciding that UE-Y is subordinate. The initial communication resource can be a resource determined by (pre-) configuration, a resource set by a BS to UE-X and / or UE-Y, or a sidelink exceptional resource pool.

[0240] Step 22) UE-Y monitors and receives the sidelink broadcast signal from UE-X, and based on the received information, transmits a request to enter under UE-X to UE-X using the initial communication resource. The signal of the request can be a sequence signal, a PRACH for sidelink, or a control channel and / or a shared channel. Information about UE-Y such as A) to E) shown below can be transmitted to UE-X together with the signal of the request or in addition.

[0241] A) information measured based on the signal received from UE-X. For example, the information can be RSRP, RSRQ, RSSI, or the like.

[0242] B) information related to the requirement of communication between UE-X and its own device, or between other UE-Y and its own device. For example, the information can be priority, QoS indicator, or the like.

[0243] C) parameters required for communication between UE-X and its own device, or between other UE-Y and its own device. For example, the parameters can be time and / or frequency resources, transmission power, resource period, or the like.

[0244] D) capability, UE type, connection to which BS or PLMN, and / or whether or not to be connected.

[0245] E) UE-Y position information, a signal for position measurement (for example, a reference signal), or information for position measurement (for example, RX-TX time difference, RSRP, angle-related information, or the like).

[0246] Step 23) UE-X monitors and receives the signal of the request from UE-Y using the initial communication resource. UE-X transmits a notification to enter under UE-Y to UE-Y using the initial communication resource based on the received information. UE-Y receives the notification using the initial communication resource.

[0247] The above is a description of Action 4).

[0248] The following describes Action 5) information transmitted by UE-X to the base station.

[0249] The UE-X can report at least one of the information reported to the BS by the UE-X in the above-mentioned action 2) to the BS after the above-mentioned step 11) and the above-mentioned step 12) are completed. Further, the UE-X can report at least one of the information reported to the BS by the UE-X in the above-mentioned action 2) to the BS after the above-mentioned step 21) and the above-mentioned step 22) are completed. The information related to the reporting (for example, the reporting content, the time-frequency resource for reporting, and the like) can be set and / or indicated by the BS, and the reporting content can be different from the information actually reported in the above-mentioned action 2). The signaling and / or priority applied to the reporting of the UE-X to the BS can be the same as or different from the signaling and / or priority actually applied in the above-mentioned action 2).

[0250] The UE-X can report at least one of the information reported to the BS by the UE-X in the above-mentioned action 2) and / or the communication request or the scheduling request of the UE-Y to the BS during the execution of the above-mentioned step 13) or the above-mentioned step 23). The information related to the reporting (for example, the reporting content, the time-frequency resource for reporting, the period of reporting, and the like) can be set and / or indicated by the BS, and the reporting content can be different from the information actually reported in the above-mentioned action 2). The signaling and / or priority applied to the reporting of the UE-X to the BS can be the same as or different from the signaling and / or priority actually applied in the above-mentioned action 2). It is also possible to report the changed information to the BS only in the case where there is a change from the past reporting content.

[0251] The terminal information (for example, the SIM information) of the UE-Y can or can not be transmitted from the UE-X to the BS.

[0252] The above is a description of the action 5).

[0253] The following describes the information received by the UE-X from the base station in the action 6).

[0254] After completing steps 11) and 12) above, UE-X can receive at least one of the information notified to UE-X by the BS in action 2) above. Furthermore, after completing steps 21) and 22) above, UE-X can also receive at least one of the information notified to UE-X by the BS in action 2) above. Information related to the notification (e.g., time and frequency resources used for notification) can be set and / or indicated by the BS, and the received content may differ from the information actually received in action 2). The signaling and / or priority applied to the notification from the BS to UE-X may be the same as or different from the signaling and / or priority actually applied in action 2). If the notification is not received by UE-X, UE-X can either execute action 5) again or terminate the action.

[0255] During the execution of step 13) or step 23) above, UE-X may receive at least one of the information notified to UE-X by the BS in action 2) above. Information related to the notification (e.g., time-frequency resources used for notification, notification period, etc.) may be set and / or indicated by the BS, and the received content may differ from the information actually received in action 2). The signaling and / or priority applied to the notification from the BS to UE-X may be the same as that in action 2), or it may differ from the signaling and / or priority actually applied in action 2). If UE-X does not receive the notification, UE-X may continue operation based on the most recent notification from the BS, or continue operation for a predetermined period based on the most recent notification from the BS, and terminate operation if the predetermined period is exceeded.

[0256] The above is an explanation of action 6).

[0257] The following describes action 7) the connection status between the UE and the base station when the UE performs the UE-X action.

[0258] exist Figure 22 Step S601 or Figure 21 In step S702, when the BS authorizes "actions related to UE-Y" to UE-X based on the communication between UE-X and BS, the connection state between UE-X and BS can be RRC_CONNECTED, RRC_INACTIVE, or RRC_SIDELINK.

[0259] The RRC_SIDELINK state can be newly defined based on the purpose of receiving information from the BS related to sidelink communication control with UE-Y and / or transmitting information to the BS related to sidelink communication control with UE-Y. Upon migration to the RRC_SIDELINK state, all or part of the actions of UE-X's own data transmission and / or data reception can not be performed. For example, the UE in the RRC_SIDELINK state can perform the same actions as in the RRC_INACTIVE state, and actions related to receiving information from the BS related to sidelink communication control with UE-Y and / or transmitting information to the BS related to sidelink communication control with UE-Y.

[0260] In Figure 22 the step S603 of the method 600 or Figure 21 In the step S703 of the method 700, the connection state between UE-X and the BS when "performing sidelink communication between UE-X and UE-Y or between a plurality of UE-Y based on the communication between UE-X and the BS" can be the RRC_CONNECTED state, the RRC_INACTIVE state, or the RRC_SIDELINK state.

[0261] Figure 22 the step S601 of the method 600 or Figure 21 the RRC state when {the BS grants "an action related to UE-Y" to UE-X based on the communication between UE-X and the BS} in the step S702 of the method 700, and Figure 22 the step S603 of the method 600 or Figure 23 the RRC state when "performing sidelink communication between UE-X and UE-Y or between a plurality of UE-Y based on the communication between UE-X and the BS" in the step S703 of the method 700 can be different.

[0262] The above is a description of Action 7).

[0263] The following describes Action 8) UE-X's notification to UE-Y.

[0264] In the above step S603 or the above step S703, UE-X can transmit to UE-Y by any of the methods A) to C) shown below, and UE-Y performs the transmission and reception of signals between UE-X or other UE-Y based on the received information.

[0265] A) UE-X transmits the scheduling information of UE-Y received from the BS to UE-Y directly after transmitting the communication request of UE-Y to the BS. That is, the BS performs scheduling.

[0266] B) After UE-X transmits the communication request of UE-Y to the BS, UE-X transmits one of the scheduling candidates of UE-Y received from the BS to UE-Y. That is, after receiving a plurality of scheduling candidates from the BS, UE-X decides one of the candidates.

[0267] C) UE-X transmits the scheduling information to UE-Y after receiving the communication request from UE-Y according to the setting of the BS.

[0268] In addition, in the case of communication between UE-Y1 and UE-Y2, UE-X can perform any one of the above A) to C) on both UE-Y1 and UE-Y2, or can perform any one of the above A) to C) only on the transmitting side UE and perform blind decoding on the receiving side UE.

[0269] In addition, the scheduling information can be, for example, the resources of the time domain, the frequency domain, the code domain, and / or the space domain used, the MCS, the beam, the power, the period, the priority, and the like.

[0270] The above is a description of Action 8).

[0271] The following describes Action 9) in the case where UE-X is outside the service area.

[0272] UE-X can perform communication with UE-Y using the resources used when outside the service area. The resources used when outside the service area can be initial communication resources or a sidelink exceptional resource pool. In the case where UE-X is still outside the service area after a predetermined period, UE-X can stop the actions as UE-X.

[0273] UE-X can also continue communication with UE-Y based on information set and / or instructed by the BS. In the case where UE-X is still outside the service area after a predetermined period, UE-X can stop the actions as UE-X.

[0274] UE-X can notify subordinate UE-Y of the situation of being outside the service area and / or the situation of ending the actions as UE-X. UE-Y can determine that the UE-X is outside the service area and / or the actions as UE-X have ended and detach from the UE-X in the case where the UE-Y cannot receive a signal from UE-X for a certain period and / or in the case where the above notification is received.

[0275] The above is a description of Action 9).

[0276] Moreover, in the above-described embodiments, the structure of the conventional SL channel and SL signal is used, but it is not limited thereto. For example, in a case where an interlaced channel is applied as a structure for satisfying the OCB requirement, the present embodiment can also be applied.

[0277] Moreover, the above-described embodiments can also be limited to be applied in a case where a predetermined condition is satisfied. For example, it can be applied in association with a predetermined SL channel or SL signal. For example, the present embodiment can be applied to any one of PSCCH / PSSCH, PSFCH, S-SSB, and SL positioning RS. For example, it can be applied based on a predetermined setting or a prior setting. For example, in a resource pool, in a case where it is given by a setting or a prior setting that the present embodiment is "activated", the present embodiment can also be applied. For example, in a case where the LBT method related to the second SL transmission is not Type 1 or becomes a type other than Type 1, the present embodiment can also not be applied.

[0278] In addition, in order to apply LBT Type 2A, 2B, or 2C, an additional transmission (additional TX) such as CP extension or the like can be performed immediately before the transmission of P.

[0279] In addition, the possibility of application of the present embodiment and the UE capability involved in the action can be defined, and it can be reported to the base station 10 and / or the terminal 20, or it can not be reported.

[0280] In addition, the SL transmission of the UE can be any one of PSCCH, PSSCH, PSFCH, S-SSB, and SL-PRS, and a different channel or signal can be applied in each action of the present embodiment.

[0281] In addition, at least one of the SL transmissions of the UE can be an UL transmission.

[0282] The present embodiment can be applied to any one of resource selection, resource reselection, reevaluation, and preemption check.

[0283] Moreover, the method in the present embodiment of the application is not limited to the above-described case of inter-terminal direct communication, and can also be applied to other similar cases.

[0284] The above-described embodiments are not limited to application to V2X terminals, and can also be applied to terminals that perform D2D communication.

[0285] According to the above-described embodiments, by network control, a certain UE can flexibly allocate sidelink resources to other UEs.

[0286] That is, efficient sidelink communication can be achieved based on network control.

[0287] (Structure of device)

[0288] Next, an example of a functional configuration of the base station 10 and the terminal 20 that execute the above-described processing and operation will be described. The base station 10 and the terminal 20 include the functions of the above-described embodiments. However, the base station 10 and the terminal 20 can each have only a part of the functions of the embodiments.

[0289] <Base station 10>

[0290] Figure 23 is a diagram showing an example of a functional configuration of the base station 10. As shown in Figure 23 , the base station 10 has a transmission section 110, a reception section 120, a setting section 130, and a control section 140. Figure 24 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 operation related to the embodiments of the present application can be executed.

[0291] 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 acquiring, 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.

[0292] 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 the setting information 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.

[0293] As described in the embodiments, the control section 140 performs processing related to the setting for the terminal 20 to perform D2D communication. Further, the control section 140 transmits scheduling of D2D communication and DL communication to the terminal 20 via the transmission section 110. Further, the control section 140 receives information related 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 related to signal transmission can be included in the transmission section 110, and the functional section in the control section 140 related to signal reception can be included in the reception section 120.

[0294] <Terminal 20>

[0295] Figure 24 is a diagram showing an example of a functional configuration of the terminal 20. As shown in Figure 24 , the terminal 20 has a transmission section 210, a reception section 220, a setting section 230, and a control section 240. Figure 23The illustrated functional configuration is merely an example. The functional division and the names of the functional sections can be arbitrary as long as the actions involved in the embodiments of the present application can be executed.

[0296] The transmission section 210 generates a transmission signal in accordance with transmission data and transmits the transmission signal in a wireless manner. The reception section 220 receives various signals in a wireless manner and acquires higher layer signals from the received physical layer signals. Further, the reception section 220 has a function of receiving an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL / SL control signal, or a reference signal, and the like, which are transmitted from the base station 10. Also, for example, as D2D communication, the transmission section 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to other terminals 20, and the reception section 220 receives a PSCCH, a PSSCH, a PSDCH, or a PSBCH, and the like from other terminals 20.

[0297] 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 from the storage device as necessary. Further, the setting section 230 also stores setting information set in advance. The content of the setting information is, for example, information related to the setting of D2D communication or the like.

[0298] 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 relating to power saving operation. Further, the control section 240 performs processing relating to HARQ of D2D communication and DL communication. Further, the control section 240 transmits information relating to HARQ response of D2D communication and DL communication scheduled from the base station 10 to other terminal 20 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 a resource used in D2D communication from a resource selection window according to a result of sidelink monitoring, and can perform reevaluation or preemption. Further, the control section 240 performs processing relating to power saving in transmission and reception of D2D communication. Further, the control section 240 performs processing relating to inter-terminal coordination in D2D communication. Further, the control section 240 performs processing relating to LBT in D2D communication. The functional section relating to signal transmission in the control section 240 can be included in the transmission section 210, and the functional section relating to signal reception in the control section 240 can be included in the reception section 220.

[0299] (Hardware structure)

[0300] The block diagrams used in the explanation of the above-described embodiments Figure 24 and Figure 25 show blocks in units of functions. These functional blocks (structural sections) 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 wire, wireless, or the like) connected and realized using the plurality of devices. The functional blocks can also be realized in combination with software in the above-described one device or the above-described plurality of devices.

[0301] The functions include judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited to these. For example, a functional block (structural unit) that functions to transmit is referred to as a transmitting unit or a transmitter. In any case, as described above, the implementation method is not particularly limited.

[0302] 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 processing of the wireless communication method of the present disclosure. Figure 23 is a diagram that shows an example of a hardware structure of the base station 10 and the terminal 20 in one embodiment of the present disclosure. The base station 10 and the terminal 20 can also be configured as a computer device that physically includes the processor 1001, the storage 1002, the auxiliary storage 1003, the communication device 1004, the input device 1005, the output device 1006, the bus 1007, and the like.

[0303] In addition, in the following description, the term "device" can be replaced with "circuit," "apparatus," "unit," or the like. The hardware structure of the base station 10 and the terminal 20 can be configured to include one or more of the illustrated devices, or can be configured not to include a part of the devices.

[0304] Each function in the base station 10 and the terminal 20 is implemented by reading predetermined software (program) into the hardware such as the processor 1001, the storage 1002, and causing the processor 1001 to perform arithmetic operation and control at least one of communication of the communication device 1004 or readout and write of data in the storage 1002 and the auxiliary storage 1003.

[0305] 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) that includes an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, the control unit 140, the control unit 240, and the like can also be implemented by the processor 1001.

[0306] Further, the processor 1001 reads out programs (program codes), software modules, or data, etc., from the storage device 1003 and the communication device 1004 at least one of them to the storage device 1002, and executes various processes according to the programs. As the program, a program that causes the computer to execute at least a part of the operations described in the above-described embodiments is used. For example, Figure 24 The control section 140 of the base station 10 illustrated can also be realized by a control program stored in the storage device 1002 and operated in the processor 1001. Also, for example, Figure 26 The control section 240 of the terminal 20 illustrated can also be realized by a control program stored in the storage device 1002 and operated in the processor 1001. Although it is described that the above-described various processes are executed by one processor 1001, the above-described various processes can also be executed by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be realized by one or more chips. In addition, the program can also be transmitted from a network via a telecommunication line.

[0307] 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 can hold programs (program codes), software modules, and the like that can be executed in order to implement the communication method related to one embodiment of the present disclosure.

[0308] 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 above-described storage medium 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.

[0309] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network. It may also be referred to as a network device, network controller, network interface card (NIC), communication module, etc. The communication device 1004 may, for example, be configured to include a high-frequency switch, duplexer, filter, frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, transceiver antennas, amplifiers, transceiver units, transmission path interfaces, etc., can also be implemented using the communication device 1004. The transceiver unit may also be physically or logically separated into a transmitting unit and a receiving unit.

[0310] Input device 1005 is an input device that accepts input from external sources (e.g., keyboard, mouse, microphone, switch, button, sensor, etc.). Output device 1006 is an output device that performs output to external sources (e.g., display, speaker, LED, etc.). Alternatively, input device 1005 and output device 1006 can also be integrated (e.g., a touch panel).

[0311] Furthermore, the processor 1001 and storage device 1002, among other devices, are connected via a bus 1007 for communicating information. The bus 1007 can be configured as a single bus or as different buses used between the devices.

[0312] Furthermore, the base station 10 and the terminal 20 can be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or a FPGA (Field Programmable Gate Array), and can also use this hardware to implement part or all of the functional blocks. For example, the processor 1001 can also be implemented using at least one of these hardware components.

[0313] Figure 26 An example of the structure of vehicle 2001 is shown. For example... ​As shown, the vehicle 2001 has a drive section 2002, a steering section 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, an electronic control section 2010, various sensors 2021 to 2029, an information service section 2012, and a communication module 2013. The forms / embodiments explained in the present disclosure can also be applied to the communication device mounted on the vehicle 2001, for example, to the communication module 2013.

[0314] The drive section 2002 is constituted by, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering section 2003 at least includes a steering wheel (also called a steering handle), and is configured to steer at least one of the front wheels and the rear wheels based on an operation of the steering wheel operated by a user.

[0315] The electronic control section 2010 is constituted by a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (I / O port) 2033. Signals from the various sensors 2021 to 2029 possessed by the vehicle 2001 are input to the electronic control section 2010. The electronic control section 2010 can also be called an ECU (Electronic Control Unit).

[0316] As the signals from the various sensors 2021 to 2029, there are a current signal from a current sensor 2021 that senses a current of a motor, a rotational speed signal of the front wheels and the rear wheels acquired by a rotational speed sensor 2022, an air pressure signal of the front wheels and the rear wheels acquired by an air pressure sensor 2023, a vehicle speed signal acquired by a vehicle speed sensor 2024, an acceleration signal acquired by an acceleration sensor 2025, a depression amount signal of the accelerator pedal acquired by an accelerator pedal sensor 2029, a depression amount signal of the brake pedal acquired by a brake pedal sensor 2026, an operation signal of the shift lever acquired by a shift lever sensor 2027, a detection signal for detecting an obstacle, a vehicle, a pedestrian, or the like acquired by an object detection sensor 2028, and the like.

[0317] The information service section 2012 is constituted by various devices for providing (outputting) various information such as driving information, traffic information, entertainment information, and the like, and one or more ECUs that control these devices, such as a car navigation system, an audio system, a speaker, a television, a radio, and the like. The information service section 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 2001 using information acquired from external devices via the communication module 2013 or the like. The information service section 2012 can include an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, a touch panel, or the like) that receives input from the outside, and can also include an output device (for example, a display, a speaker, an LED lamp, a touch panel, or the like) that performs output to the outside.

[0318] The drive assist system section 2030 is constituted by one or more ECUs for providing various devices and controlling these devices for functions to prevent accidents or to reduce the driving load on the driver, such as millimeter wave radar, LiDAR (Light Detection and Ranging), a camera, a positioner for positioning (e.g., GNSS, etc.), map information (e.g., a high-definition (HD) map, an autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, an AI processor. In addition, the drive assist system section 2030 transmits and receives various information via the communication module 2013 to implement a drive assist function or an autonomous driving function.

[0319] The communication module 2013 is capable of communicating with the microprocessor 2031 and the constituent elements of the vehicle 2001 via a communication port. For example, the communication module 2013 transmits and receives data between the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the microprocessor 2031, and the memory (ROM, RAM) 2032 in the electronic control section 2010, and the sensors 2021 to 2029 possessed by the vehicle 2001 via the communication port 2033.

[0320] The communication module 2013 is capable of being controlled by the microprocessor 2031 of the electronic control section 2010 and is a communication device capable of communicating with an external device. For example, various information is transmitted and received between the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control section 2010. The external device can also be a base station, a mobile station, or the like, for example.

[0321] The communication module 2013 can also transmit at least one of the signals input to the electronic control section 2010 from the various sensors 2021 to 2028 described above, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service section 2012 to the external device via wireless communication. The electronic control section 2010, the various sensors 2021 to 2028, the information service section 2012, and the like can also be referred to as input sections that accept input. For example, the PUSCH transmitted by the communication module 2013 can contain information based on the above input.

[0322] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device, and displays it on the information service section 2012 possessed by the vehicle 2001. The information service section 2012 can also be referred to as an output section that outputs information (for example, outputs information to a display, a speaker, or the like based on PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). Furthermore, the communication module 2013 stores various information received from an external device in the memory 2032 that is available to the microprocessor 2031. The microprocessor 2031 can also perform control of the drive section 2002, the steering section 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the front wheels 2007, the rear wheels 2008, the axles 2009, the sensors 2021 to 2029, and the like possessed by the vehicle 2001, based on information stored in the memory 2032.

[0323] (SUMMARY OF EMBODIMENTS)

[0324] As described above, according to the embodiment of the present application, there is provided a terminal having a reception section that receives a broadcast signal from another terminal, and a transmission section that transmits a signal requesting to become a subordinate to the other terminal based on the broadcast signal, the reception section receiving a notification of becoming a subordinate from the other terminal.

[0325] With the above structure, through network-based control, a certain UE is able to perform flexible sidelink resource allocation to other UEs. That is, efficient sidelink communication can be achieved based on network-based control.

[0326] Also, the transmission section can transmit a communication request to at least any one of the other terminal, a base station, and a function of a core network, and the reception section can receive scheduling information from at least any one of the other terminal, the base station, and the function of the core network. With this structure, through network-based control, a certain UE is able to perform sidelink resource allocation to other UEs.

[0327] The reception section and the transmission section can also not perform direct communication with a base station. With this structure, through network-based control, a certain UE is able to perform sidelink resource allocation to a UE that does not communicate with a base station.

[0328] Also, the transmission section can transmit information related to a communication requirement with the other terminal to at least any one of the other terminal, a base station, and a function of a core network. With this structure, through network-based control, a certain UE is able to perform sidelink resource allocation to other UEs.

[0329] It can also be that the receiving section detaches from the subordinate of the other terminal in a case where the receiving section cannot receive a signal from the other terminal for a certain period. With this structure, a certain UE can detach from a subordinate that allocates sidelink resources to other UEs.

[0330] In addition, according to an embodiment of the present application, there is provided a communication method executed by a terminal, including the steps of: receiving a broadcast signal from another terminal; transmitting a signal requesting to become a subordinate to the other terminal based on the broadcast signal; and receiving a notification of becoming a subordinate from the other terminal.

[0331] With the above structure, a certain UE can flexibly allocate sidelink resources to other UEs based on network control. That is, efficient sidelink communication can be achieved based on network control.

[0332] (Supplement to Embodiments)

[0333] The above describes 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 these numerical examples are only examples, and any appropriate value can be used unless specifically indicated. The item divisions in the above description are not essential to the present application, and two or more items described in one item can be combined as needed, or an item described in one item can be applied to an item described in another item (as long as there is no contradiction). The boundaries of functional blocks or processing blocks in the functional block diagram do not necessarily correspond to the boundaries of physical components. The actions of multiple functional blocks can be performed by one physical component, or the actions of one functional block can be performed by multiple physical components. The order of the processes described in the embodiments can be changed as long as there is no contradiction. The base station 10 and the terminal 20 are described using a functional block diagram for facilitating description of the processes, but such devices can also be implemented by hardware, software, or a combination thereof. Software that acts according to the embodiments of the present application by a processor included in the base station 10 and software that acts according to the embodiments of the present application by a processor included in the terminal 20 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 any other appropriate arbitrary storage medium.

[0334] Further, the notification of the information is not limited to the forms / embodiments explained in the present disclosure, and can be performed using other methods. For example, the notification of the information can be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. Further, the RRC signaling can be referred to as an RRC message, for example, can be an RRC Connection Setup message, an RRC Connection Reconfiguration message, and the like.

[0335] The forms / embodiments described in the present disclosure can also be applied to at least one of systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6G (6th generation mobile communication system), xG (xth generation mobile communication system) (xG (x is an integer, a fraction) ), FRA (Future Radio Access), NR (new Radio), NX (New radio access), FX (Future generation radio access), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and a next-generation system created, modified, created, and specified based on these systems. In addition, a plurality of systems (for example, at least one of LTE and LTE-A and 5G, etc.) can be combined and applied.

[0336] For the processes, timing, flow, and the like of the forms / embodiments described in the present specification, the order can be changed without contradiction. For example, for the methods described in the present disclosure, the elements of various steps are prompted using the order of the examples, but are not limited to the specific order prompted.

[0337] In the present specification, specific actions performed by the base station 10 are sometimes also performed by an upper node thereof, as appropriate. In a network constituted by one or a plurality of network nodes having the base station 10, it is obvious that 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 an MME or an S-GW or the like, but not limited to these) other than the base station 10. In the above, a case where the other network node other 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, an MME and an S-GW).

[0338] Information or a signal and the like explained in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be input or output via a plurality of network nodes.

[0339] Information and the like input or output can be saved in a specific location (for example, a memory), and can be managed using a management table. Information and the like input or output can be rewritten, updated, or appended. Information and the like output can also be deleted. Information and the like input can also be transmitted to other apparatuses.

[0340] Determination in the present disclosure can be performed 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).

[0341] As for software, regardless of being called software, firmware, middleware, microcode, hardware description language, or by another name, it should be broadly interpreted as meaning a command, a command set, code, a code segment, program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a sub routine, an object, an executable file, an execution thread, a procedure, a function, and the like.

[0342] In addition, software, commands, information, and the like can also be transmitted and received via a transmission medium. For example, in a case where software is transmitted from a web page, a server, or another 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.

[0343] The information, signals, and / or the like described in the present disclosure can be represented using various different technologies and / or techniques. For example, data, commands, instructions, information, signals, bits, symbols, chips, and / or the like that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0344] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure can be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol can also be a signal (signaling). Also, a signal can be a message. Also, a component carrier (CC) can be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0345] The terms "system" and "network" used in the present disclosure can be used interchangeably.

[0346] Also, the information, parameters, and / or the like described in the present disclosure can be represented using absolute values, relative values with respect to predetermined values, or corresponding other information. For example, a radio resource can be indicated using an index.

[0347] The names used for the above-described parameters are non-limiting names in any respect. Further, the formulas and / or the like using the parameters are sometimes different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, and / or the like) and information elements can be identified by all appropriate names, and thus various names assigned to the various channels and information elements are non-limiting names in any respect.

[0348] 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 / or the like can be used interchangeably. The base station is sometimes referred to as a macro cell, a small cell, a femto cell, a pico cell, and / or the like.

[0349] A base station can accommodate one or plural (for example, 3) cells. In a case where a base station accommodates plural cells, the coverage area of the base station as a whole can be divided into plural 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-sized base station RRH: Remote Radio Head for indoor use). The term "cell" or "sector" refers 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.

[0350] In the present disclosure, the base station transmitting information to the terminal can also be replaced with the base station instructing the terminal of a control・action based on the information.

[0351] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0352] For a mobile station, the person skilled in the art also sometimes refers to the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate term.

[0353] At least one of the base station and the mobile station can also be referred to as a transmission device, a reception device, a communication device, or the like. In addition, at least one of the base station and the mobile station can also be a device mounted on a moving body, the moving body itself, or the like. The moving body refers to an object that can move, and the moving speed is arbitrary. In addition, of course, a case where the moving body is stopped is also included. The moving body includes, for example, a vehicle, a transport vehicle, an automobile, a motorcycle, a bicycle, a connected car, a shovel, a bulldozer, a wheel loader, a dump truck, a forklift, a train, a bus, a two-wheeled trailer, a rickshaw, a ship and other watercraft, an airplane, a rocket, an artificial satellite, a Drone (registered trademark), a multicopter, a quadcopter, a balloon, and an object mounted thereon, and is not limited thereto. In addition, the moving body can also be a moving body that autonomously travels based on a travel instruction. It can be a vehicle (for example, an automobile, an airplane, or the like), a moving body that moves in a unmanned manner (for example, a drone, a self-driving car, or the like), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station is also included in a device that does not necessarily move at the time of 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.

[0354] In addition, the base station in the present disclosure can also be replaced with a user terminal. For example, a structure in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (for example, can also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), or the like) can also apply the forms / embodiments of the present disclosure. In this case, it can also be configured so that the terminal 20 has the functions of the base station 10 described above. In addition, the expressions such as "uplink" and "downlink" can also be replaced with expressions corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can also be replaced with a side channel.

[0355] Likewise, the user terminal in the present disclosure can also be replaced with a base station. In this case, it can also be configured so that the base station has the functions of the user terminal described above.

[0356] The terms "determining" and "deciding" as used in the present disclosure also include a variety of actions. For example, "determining" and "deciding" can include actions such as "judging", "calculating", "computing", "processing", "deriving", "investigating", "looking up" (searching, inquiring), for example, in tables, databases or other data structures, "ascertaining" that an action has been performed, and the like. Also, "determining" and "deciding" can include actions that can be considered as "determining" and "deciding" as receiving (for example, receiving information), transmitting (for example, transmitting information), inputting, outputting, accessing (for example, accessing data in a memory), and the like. Further, "determining" and "deciding" can include actions that can be considered as "determining" and "deciding" as resolving, selecting, choosing, establishing, comparing, and the like. That is, "determining" and "deciding" can include actions that can be considered as "determining" and "deciding" as certain actions. Also, "determining" and "deciding" can be replaced by "assuming", "expecting", "considering", and the like.

[0357] 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 the elements can include one or more intervening elements. The connection or coupling between the elements can be physical or logical, or a combination thereof. For example, "connected" can be replaced by "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 (including both visible and invisible) region is used to "connect" or "couple" to each other.

[0358] The reference signal can be simply referred to as RS (Reference Signal), and can be referred to as a pilot (Pilot) depending on the applied standard.

[0359] The expression "based on" as used in the present disclosure is not intended to mean "only based on" unless specifically stated otherwise. In other words, the expression "based on" means both "only based on" and "at least based on".

[0360] 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. Accordingly, a reference to a 1st element and a 2nd element does not mean that only two elements are possible or that in any way the 1st element must precede the 2nd element in any way.

[0361] The expression "unit" in the structure of each of the above-described apparatuses can be replaced with the expression "part", "circuit", "device", or the like.

[0362] 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 does not mean the exclusive or.

[0363] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be referred to as a subframe. A subframe can be 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.

[0364] 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.

[0365] 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.

[0366] 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.

[0367] A radio frame, a subframe, a slot, a mini-slot, and a symbol each represent a time unit in which a transmission signal is transmitted. A radio frame, a subframe, a slot, a mini-slot, and a symbol can each be referred to by another corresponding term.

[0368] For example, 1 subframe can be referred to as a transmission time interval (TTI), a plurality of consecutive subframes can also be referred to as a TTI, 1 slot or 1 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 to 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.

[0369] 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.

[0370] A TTI can be a transmission time unit of a data packet (a transport block) after channel coding, a code block, a codeword, or the like, or can be a processing unit of scheduling, link adaptation, or 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, or the like is actually mapped can be shorter than the TTI.

[0371] 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 be a minimum time unit of scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of scheduling can be controlled.

[0372] A TTI having a time length of 1 ms is also referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI (normal TTI), a long TTI (long TTI), a normal subframe, a normal subframe (normal subframe), a long (long) subframe, a slot, and the like. A TTI shorter than the normal TTI can also be referred to as a shortened TTI, a short TTI (short TTI), a partial TTI (partial or fractional TTI), a shortened subframe, a short (short) subframe, a mini-slot, a sub-slot, a slot, and the like.

[0373] In addition, for a long TTI (long TTI) (e.g., a normal TTI, a subframe, and the like), it can be understood as a TTI having a time length exceeding 1 ms, and for a short TTI (short TTI) (e.g., a shortened TTI, and the like), it can be understood as a TTI having a TTI length less than that of the long TTI (long TTI) and a TTI length of 1 ms or more.

[0374] 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, and for example, can be 12. The number of subcarriers included in the RB can also be determined according to the numerology.

[0375] 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. One TTI, one subframe, and the like can each be constituted by one or more resource blocks.

[0376] In addition, one or more RBs can also be referred to as a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0377] 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.

[0378] A bandwidth part (BWP: Bandwidth Part) (may also be referred to as a partial bandwidth, etc.) can also indicate 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 with reference to a common reference point of the carrier. The PRB can be defined in a certain BWP and numbered within the BWP.

[0379] The BWP can include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWP can be configured for the terminal 20 within one carrier.

[0380] At least one of the configured BWP 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", etc. in the present disclosure can be replaced with "BWP".

[0381] The structures of the radio frame, the subframe, the slot, the mini-slot, the symbol, etc. 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 and RBs included in the slot or mini-slot, the number of subcarriers included in the RB, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

[0382] In the present disclosure, for example, in a case where an article is added by a translation of a, an, and the in English, the present disclosure also includes a case where the article after the addition is plural.

[0383] In the present disclosure, the expression "A and B are different" can 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.

[0384] 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"), and can also be performed implicitly (for example, without performing the notification of the predetermined information).

[0385] The present disclosure has been described in detail above, but it should be clear to a person skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the present disclosure 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.

[0386] Explanation of reference numerals

[0387] 10: base station

[0388] 110: transmission section

[0389] 120: reception section

[0390] 130: setting section

[0391] 140: control section

[0392] 20: terminal

[0393] 210: transmission section

[0394] 220: reception section

[0395] 230: setting section

[0396] 240: control section

[0397] 1001: processor

[0398] 1002: storage device

[0399] 1003: auxiliary storage device

[0400] 1004: communication device

[0401] 1005: input device

[0402] 1006: output device

[0403] 2001: vehicle

[0404] 2002: drive section

[0405] 2003: steering section

[0406] 2004: accelerator pedal

[0407] 2005: brake pedal

[0408] 2006: gear lever

[0409] 2007: front wheel

[0410] 2008: rear wheel

[0411] 2009: axle

[0412] 2010: Electronic control unit

[0413] 2012: Information service unit

[0414] 2013: Communication module

[0415] 2021: Current sensor

[0416] 2022: Rotation speed sensor

[0417] 2023: Air pressure sensor

[0418] 2024: Vehicle speed sensor

[0419] 2025: Acceleration sensor

[0420] 2026: Brake pedal sensor

[0421] 2027: Gear lever sensor

[0422] 2028: Object detection sensor

[0423] 2029: Accelerator pedal sensor

[0424] 2030: Driving assistance system unit

[0425] 2031: Microprocessor

[0426] 2032: Memory (ROM, RAM)

[0427] 2033: Communication port (I / O port)

Claims

1. A terminal having: a reception section that receives a broadcast signal from another terminal; and a transmission section that transmits a signal requesting to become a subordinate to the other terminal based on the broadcast signal, the reception section receives a notification of becoming a subordinate from the other terminal.

2. The terminal according to claim 1, wherein the transmission section transmits a communication request to at least any one of the other terminal, a base station, and a function of a core network, and the reception section receives scheduling information from at least any one of the other terminal, the base station, and the function of the core network.

3. The terminal according to claim 1, wherein the reception section and the transmission section do not perform direct communication with a base station.

4. The terminal according to claim 1, wherein the transmission section transmits information about a communication requirement with the other terminal to at least any one of the other terminal, a base station, and a function of a core network.

5. The terminal according to claim 1, wherein the reception section detaches from a subordinate of the other terminal in a case where a signal from the other terminal cannot be received for a certain period.

6. A communication method executed by a terminal, comprising: receiving a broadcast signal from another terminal; transmitting a signal requesting to become a subordinate to the other terminal based on the broadcast signal; and receiving a notification of becoming a subordinate from the other terminal. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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