Terminals and communication methods

Abstract

This terminal comprises: a receiving unit that receives signals from another terminal, in any subchannel included in a resource pool composed of non-consecutive frequency resources; and a transmitting unit that transmits a signal to the other terminal, in any subchannel included in the resource pool; and a control unit that determines whether the subchannels that configure the resource pool are included in any of actual component carriers, wherein the transmitting unit transmits a feedback signal corresponding to the signal received by the receiving unit to the resource pool.

Description

Technical Field

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

Background Art

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

[0003] D2D reduces traffic between a terminal and a base station and enables communication between terminals even when the base station becomes incommunicable during a disaster or the like. Note that in 3GPP (3rd Generation Partnership Project), D2D is referred to as "sidelink", but in this specification, the more general term D2D is used. However, sidelink is also used as necessary in the description of the embodiments described later.

[0004] D2D communication is roughly classified into D2D discovery (also referred to as D2D discovery) for discovering other communicable terminals and D2D communication (also referred to as D2D direct communication, D2D communication, direct communication between terminals, etc.) for directly communicating between terminals. Hereinafter, when not particularly distinguishing between D2D communication, D2D discovery, etc., it is simply referred to as D2D. Also, a signal 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 have been studied (for example, Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

[0006] Even in direct terminal-to-terminal communication, features that use broadband to secure data resources, such as carrier aggregation, are supported. When using carrier aggregation, it is necessary to schedule data resources for each carrier, so more flexible and efficient resource allocation methods are being considered. However, in broadband, which is discontinuous in the frequency domain, a method for transmitting feedback signals that are suitable for the resource pool used in direct terminal-to-terminal communication has not been established.

[0007] This invention has been made in view of the above points, and aims to use wideband resources that are discontinuous in the frequency domain in direct communication between terminals. [Means for solving the problem]

[0008] According to the disclosed technology, a terminal is provided having a receiving unit that receives signals from other terminals in any subchannel included in a resource pool composed of discontinuous frequency resources, a transmitting unit that transmits signals to other terminals in any subchannel included in the resource pool, and a control unit that determines which of the actual component carriers the subchannels constituting the resource pool belong to, wherein the transmitting unit transmits a feedback signal in the resource pool corresponding to the signal received by the receiving unit. [Effects of the Invention]

[0009] According to the disclosed technology, direct terminal-to-terminal communication can utilize wideband resources that are discontinuous in the frequency domain. [Brief explanation of the drawing]

[0010] [Figure 1] This figure illustrates a wireless communication system according to an embodiment of the present invention. [Figure 2] This figure shows an example (1) of the configuration of a virtual CC according to an embodiment of the present invention. [Figure 3] This figure shows an example (2) of the configuration of a virtual CC according to an embodiment of the present invention. [Figure 4] This figure illustrates an example of communication in D2D according to an embodiment of the present invention. [Figure 5] This is a diagram illustrating an example (1) of a resource pool according to an embodiment of the present invention. [Figure 6] This figure illustrates an example (2) of a resource pool according to an embodiment of the present invention. [Figure 7] This is a diagram illustrating an example of a control signal (1) according to an embodiment of the present invention. [Figure 8] This figure illustrates an example of a control signal according to an embodiment of the present invention (2). [Figure 9] This figure illustrates an example (1) of a data signal according to an embodiment of the present invention. [Figure 10] This figure illustrates an example (2) of a data signal according to an embodiment of the present invention. [Figure 11] This is a diagram illustrating an example (1) of resource reservation according to an embodiment of the present invention. [Figure 12] This figure illustrates an example (2) of resource reservation according to an embodiment of the present invention. [Figure 13] This figure illustrates an example (1) of HARQ feedback according to an embodiment of the present invention. [Figure 14] This figure illustrates an example (2) of HARQ feedback according to an embodiment of the present invention. [Figure 15] This is a diagram for explaining an example (3) of HARQ feedback according to an embodiment of the present invention. [Figure 16] This is a diagram for explaining an example (1) of S-SSB according to an embodiment of the present invention. [Figure 17] This is a diagram for explaining an example (2) of S-SSB according to an embodiment of the present invention. [Figure 18] This is a diagram showing an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 19] This is a diagram showing an example of the functional configuration of the terminal 20 in an embodiment of the present invention. [Figure 20] This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 in an embodiment of the present invention. [Figure 21] This is a diagram showing an example of the configuration of the vehicle 2001 in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are appropriately used. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced, and systems after LTE-Advanced (e.g., NR), or wireless LAN (Local Area Network) unless otherwise specified.

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0014] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from the base station 10 or terminal 20 are configured.

[0015] Figure 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. The wireless communication system according to an embodiment of the present invention includes a base station 10 and a terminal 20, as shown in Figure 1. Although Figure 1 shows one base station 10 and one terminal 20, this is an example, and there may be multiple base stations 10 and terminals 20.

[0016] Base station 10 is a communication device that provides one or more cells and performs wireless communication with terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. In addition, the TTI (Transmission Time Interval) in the time domain may be a slot, or the TTI may be a subframe.

[0017] The base station 10 transmits synchronization signals and system information to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, via NR-PBCH and is also called broadcast information. The synchronization signals and system information may also be called SSB (SS / PBCH block). As shown in Figure 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals using beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via secondary cells (SCell) and primary cells (PCell) using CA (Carrier Aggregation). Furthermore, terminal 20 may communicate via the primary cell of base station 10 and the primary secondary cell group cell (PSCell: Primary SCG Cell) of other base stations 10 using DC (Dual Connectivity).

[0018] Terminal 20 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. As shown in Figure 1, Terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. Terminal 20 also receives various reference signals transmitted from the base station 10 and performs propagation path quality measurements based on the reception results of these reference signals. Terminal 20 may also be referred to as UE and base station 10 as gNB.

[0019] Furthermore, LTE and NR support carrier aggregation, a feature that uses broadband to secure data resources. Carrier aggregation allows for the securing of broadband data resources by bundling multiple component carriers. For example, by bundling multiple 20MHz bandwidths, a 100MHz bandwidth can be used.

[0020] Traditional carrier aggregation functions require scheduling data resources for each of the bundled component carriers, resulting in significant resource allocation overhead.

[0021] Therefore, this document describes a method for allocating resources using scheduling units with a different granularity than component carriers, and a terminal that performs resource allocation using scheduling units with a different granularity than component carriers.

[0022] A framework that performs scheduling or aggregation at a different granularity than component carriers is defined as frequency fragmentation. Here, "component carrier" may refer to a set of frequency resources corresponding to conventional scheduling units (i.e., the actual CC described later), and the set of frequency resources in frequency fragmentation (i.e., the virtual CC described later) may also be called a "component carrier."

[0023] Furthermore, in carrier aggregation, we define discontinuous carrier aggregation as performing aggregation (aggregation) at a different granularity than that of component carriers.

[0024] Furthermore, in carrier aggregation (discontinuous carrier aggregation), discontinuous scheduling is defined as scheduling at a different granularity than that of the component carriers.

[0025] The granularity different from the component carriers mentioned above may be in units of virtual CC (virtual Component Carrier), BWP (Bandwidth Part), PRB (Physical Resource Block), or PRB set.

[0026] Here, a virtual CC is a carrier set that bundles all or part of the frequency resources contained in each of several component carriers.

[0027] For example, a virtual CC can be assumed to be composed of multiple BWPs.

[0028] Figure 2 shows an example (2) of the configuration of a virtual CC according to an embodiment of the present invention. The virtual CC#i shown in Figure 2 is a carrier set formed by bundling BWP#a and BWP#b included in each component carrier from among a plurality of component carriers (CC#0 and CC#1).

[0029] Furthermore, it may be assumed that the virtual CC consists of multiple PRBs or sets of PRBs.

[0030] Figure 3 shows an example (2) of the configuration of a virtual CC according to an embodiment of the present invention. The virtual CC#i shown in Figure 3 is a carrier set that bundles multiple PRBs contained in each component carrier from among multiple component carriers (CC#0 and CC#1). Note that these multiple PRBs or PRB sets may be contained in one or more BWPs.

[0031] Terminal 20 may transmit terminal capability information indicating the configuration of the virtual CC to base station 10. The terminal capability information indicating the configuration of the virtual CC may, for example, be information indicating that the virtual CC is composed of multiple BWPs, or information indicating that the virtual CC is composed of multiple PRBs.

[0032] Furthermore, terminal capability information indicating the configuration of a virtual CC may also be information indicating support for a virtual CC composed of multiple BWPs and a virtual CC composed of multiple PRBs.

[0033] Furthermore, terminal 20 may assume that an index for identifying each virtual CC is set by base station 10 in RRC. Also, terminal 20 may assume that the index for identifying each virtual CC is the minimum value (e.g., i=0 in Figure 2 or Figure 3) or maximum value (e.g., i=1 in Figure 2 or Figure 3) of the component carrier index.

[0034] Terminal 20 may assume that the scheduling unit in discontinuous scheduling is notified by (i) a virtual CC index, (ii) an index of multiple component carriers + an index of multiple BWPs, (iii) an index of multiple component carriers + an index of multiple PRBs or PRB sets, (iv) an index of multiple component carriers + an index of multiple BWPs + an index of multiple PRBs or PRB sets, etc.

[0035] Furthermore, terminal 20 may assume that the resource unit of carrier aggregation is a virtual CC, BWP, PRB, or PRB set.

[0036] The operation described above makes it possible to achieve resource allocation at a scheduling unit with a different granularity than the component carrier.

[0037] Figure 4 is a diagram illustrating an example of communication in D2D according to an embodiment of the present invention. 3GPP is considering and working on specifications to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending the D2D function. V2X is a part of ITS (Intelligent Transport Systems) and is a general term encompassing V2V (Vehicle to Vehicle), which refers to communication between vehicles; V2I (Vehicle to Infrastructure), which refers to communication between vehicles and roadside units (RSUs) installed on the roadside; V2N (Vehicle to Network), which refers to communication between vehicles and ITS servers; and V2P (Vehicle to Pedestrian), which refers to communication between vehicles and mobile terminals carried by pedestrians.

[0038] Furthermore, 3GPP is considering V2X using LTE or NR cellular communication and terminal-to-terminal communication. V2X using cellular communication is also called cellular V2X. For NR V2X, research is underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0039] Regarding LTE or NR V2X, it is anticipated that future considerations will extend beyond 3GPP specifications. For example, it is expected that considerations will be given to ensuring interoperability, reducing costs through the implementation of higher layers, methods for using or switching between multiple RATs (Radio Access Technologies), compliance with regulations in various countries, and methods for data acquisition, distribution, database management, and utilization of LTE or NR V2X platforms.

[0040] In embodiments of the present invention, the communication device is not limited to any particular form. For example, the communication device may be mounted on a vehicle, the communication device may be a terminal held by a person, the communication device may be a device mounted on a drone or aircraft, or the communication device may be a base station, RSU, relay station (relay node), terminal with scheduling capabilities, etc.

[0041] Furthermore, SL (Sidelink) may be distinguished from UL (Uplink) or DL ​​(Downlink) based on any one or a combination of the following 1)-4). Also, SL may have other names. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Reference synchronization signals (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmit power control

[0042] Furthermore, with respect to SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of the following may be applied: CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform - Spread - OFDM), OFDM without transform precoding, or OFDM with transform precoding.

[0043] In a Single Link (SL), transmission resources may be dynamically allocated by DCI (Downlink Control Information) transmitted from the base station 10 to the terminal 20, or Semi-Persistent Scheduling (SPS) may be possible. Alternatively, the terminal 20 may autonomously select transmission resources from the resource pool.

[0044] In the embodiments of the present invention, the term "slot" may be interpreted as a symbol, mini-slot, subframe, wireless frame, TTI (Transmission Time Interval), or time resource of a predetermined width. Furthermore, in the embodiments of the present invention, the term "cell" may be interpreted as a cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.

[0045] In the embodiments of the present invention, terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication. For example, terminal 20 may be a user-owned terminal such as a smartphone, or it may be an IoT (Internet of Things) device such as a smart meter.

[0046] As shown in Figure 4, we assume an environment where multiple UEs, such as UE#A, UE#B, UE#C, and UE#D, communicate with each other. The resource pool used by each UE for sending and receiving is a set of resources in the time domain and frequency domain. The resource pool may be configured or pre-configured by the system or service provider. For example, in the resource pool, several time resources based on periodicity may be available for periodic traffic. Also, for example, in the resource pool, some frequency resources may be unavailable to reduce interference to the Uu interface (the wireless interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment)).

[0047] In the resource pool shown in Figure 4, subchannels are units of frequency domain scheduling. For example, {10,12,15,20,25,50,75,100}PRB may be set as one subchannel or pre-configured.

[0048] In the resource pool shown in Figure 4, slots represent the unit of time-domain scheduling. Symbol-based scheduling may be too complex if the UE (User Environment) autonomously selects resources. However, scheduling does not necessarily have to be slot-based.

[0049] As shown in Figure 4, the beginning of a slot transmitted from UE#A to UE#B is a transition period from the perspective of the transmitting UE. The transition period is the time required to adjust the transmitted power. On the other hand, the beginning of a slot transmitted from UE#A to UE#B is used for AGC (Auto Gain Control) from the perspective of the receiving UE. Received power differs significantly between links, and a predetermined period is required to adjust the power range. By scheduling on a slot-by-slot basis, an increase in AGC opportunities can be prevented.

[0050] As shown in Figure 4, the end of the slot transmitted from UE#A to UE#B is used for the transmit / receive switching period. A UE may transmit in slot n and then receive in slot n+1. The transmit / receive switching period is defined for each slot.

[0051] As shown in Figure 4, if the transmission from UE#C to UE#A and the transmission from UE#D to UE#C overlap in the same slot, UE#C cannot perform transmission and reception simultaneously, and therefore must drop one of them. In other words, D2D communication becomes half-double overlapping transmission.

[0052] Note that the default settings for locations outside the base station's coverage area may be pre-configured. The RRC connection / configuration between UEs performing unicast is referred to as the PC5-RRC connection / configuration.

[0053] Here, the scheduling using the virtual CC described above may also be applicable to sidelinks. Furthermore, the operation of the resource pool, not just the carrier, needs to be considered. Also, the concept of a carrier may not be applicable in some cases.

[0054] Hereafter, the terms carrier, actual CC, and virtual CC will be used, but the terminology is not limited to these. For example, an actual CC may mean a set of consecutive frequency resources. For example, a virtual CC may mean a bundle of actual CC frequency resources. For example, a virtual CC may be treated as 1 CC, and the actual CC may not be defined.

[0055] Note that the actual CC may be a CC within the same band or a CC from a different band. Also, "configuration" may be replaced with "pre-configuration".

[0056] The subchannel may be any one or a combination of the following 1)-3).

[0057] 1) PSCCH (Physical Sidelink Control Channel) - Unit of frequency domain for transmission resources 2) PSSCH (Physical Sidelink Shared Channel) is a unit in the frequency domain for transmission resources. 3) PSFCH (Physical Sidelink Feedback Channel) - Unit of frequency domain for transmission resources

[0058] Note that "sending" and "receiving" may be interchangeable.

[0059] Proposal 1) The SL resource pool may consist of discontinuous frequency resources. Hereinafter, "SL resource pool" may mean "a resource pool for inter-terminal communication (e.g., for side-link communication)."

[0060] Proposal 1-1) Figure 5 is a diagram illustrating an example (1) of a resource pool according to an embodiment of the present invention. As shown in Figure 5, when multiple actual CCs are set to a virtual CC, each subchannel is set to one of the actual CCs, and the collection of such subchannels may be a resource pool. For example, each subchannel in a resource pool exists confined to one of the actual CCs, and it is not assumed that each subchannel is set across multiple actual CCs. Figure 5 shows an example where subchannels #0 and #1 are set to actual CC #0, and subchannels #2 and #3 are set to actual CC #1.

[0061] Each subchannel in the resource pool may be limited to contiguous frequency resources within the configured actual CC, or it may consist of discontinuous frequency resources. The resource pool may be limited to cases where the numerology, i.e., SCS (Subcarrier Spacing), is the same between the actual CCs. Alternatively, the numerology, i.e., SCS, may differ between the actual CCs in the resource pool.

[0062] The above proposal 1-1) enables flexible and highly efficient resource allocation. Furthermore, it helps to avoid complicating the configuration within subchannels.

[0063] Proposal 1-2) Figure 6 is a diagram illustrating an example (2) of a resource pool according to an embodiment of the present invention. As shown in Figure 6, when multiple actual CCs are set to a virtual CC, some or all of the subchannels are set to one or more actual CCs, and the collection of such subchannels may be a resource pool. For example, a subchannel in a resource pool may be set across multiple actual CCs. Figure 6 shows an example where subchannels #0 and #1 are set to actual CC #0, subchannel #2 is set across actual CC #0 and actual CC #1, and subchannel #3 is set to actual CC #1.

[0064] Each subchannel in the resource pool may be limited to contiguous frequency resources within the configured actual CC, or it may consist of discontinuous frequency resources. The resource pool may be limited to cases where the numerology, i.e., SCS, is the same between the actual CCs. Alternatively, the numerology, i.e., SCS, may differ between the actual CCs in the resource pool.

[0065] When a subchannel is configured across multiple actual CCs, the CC boundaries may be at any frequency position and may be subject to certain constraints. For example, if the number of PRBs in a subchannel is N, then the number of PRBs for each actual CC included in that subchannel may be N. i Therefore, N = Σ i N i It can be expressed as follows. In this case, N i It may be stipulated that there must be at least a certain number of PRBs. That is, for each subchannel, each actual CC must contain at least a certain number of PRBs.

[0066] The above proposals 1-2) enable flexible and highly efficient resource allocation.

[0067] Proposal 2) Control signals (e.g., PSCCH, SCI) may be transmitted in an SL resource pool composed of discontinuous frequency resources.

[0068] Proposal 2-1) Figure 7 is a diagram illustrating an example (1) of a control signal according to an embodiment of the present invention. In the resource pool shown in Proposal 1-1), as shown in Figure 7, PSCCH#1, PSCCH#2, or PSCCH#3, the PSCCH or SCI may be transmitted confined to one of the actual CCs and may not be transmitted across multiple actual CCs.

[0069] For example, PSCCH or SCI may be assumed to always be transmitted using a single subchannel, such as PSCCH#2 or PSCCH#3, or it may be transmitted using multiple subchannels, such as PSCCH#1. PSCCH or SCI transmissions may be limited to contiguous frequency resources within the actual CC, or they may be performed using discontinuous frequency resources.

[0070] The above proposal 2-1) makes it possible to simplify the transmission and reception of control signals.

[0071] Proposal 2-2) In the resource pool shown in Proposal 1-1), a PSCCH or SCI may be transmitted across multiple actual CCs, as shown in PSCCH#4 in Figure 7. For example, a PSCCH or SCI may be transmitted using multiple subchannels. This operation may be limited to cases where the numerology, i.e., SCS, is the same across the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different across the actual CCs. PSCCH transmission or SCI transmission may be limited to contiguous frequency resources within the actual CCs, or it may be performed on discontinuous frequency resources.

[0072] As proposed in 2-2) above, the resources for transmitting and receiving control signals can be flexibly determined.

[0073] Proposal 2-3) Figure 8 is a diagram illustrating an example (2) of a control signal according to an embodiment of the present invention. As shown in Figure 8, PSCCH#1, in the resource pool shown in Proposal 1-2), PSCCH or SCI may be transmitted confined to one of the actual CCs and not necessarily transmitted across multiple actual CCs. For example, if the subchannel spans multiple actual CCs, PSCCH or SCI may be transmitted on a portion of the frequency resources of the subchannel so as to be transmitted on only one of the actual CCs. PSCCH transmission or SCI transmission may be limited to contiguous frequency resources within the actual CC, or it may be performed on discontinuous frequency resources.

[0074] The above-mentioned proposals 2-3) can simplify the process of sending and receiving control signals.

[0075] Proposal 2-4) In the resource pool shown in Proposal 1-2), PSCCH or SCI may be transmitted across multiple actual CCs, as shown in PSCCH#4 in Figure 8. This operation may be limited to cases where the numerology, i.e., SCS, is the same across the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different across the actual CCs. PSCCH transmission or SCI transmission may be limited to contiguous frequency resources within the actual CCs, or it may be performed on discontinuous frequency resources.

[0076] As proposed in 2-4) above, the resources for transmitting and receiving control signals can be flexibly determined.

[0077] Proposal 3) Data signals (PSSCH, SL-SCH) may be transmitted in a resource pool composed of discontinuous frequency resources. Proposal 3-1) Figure 9 is a diagram illustrating an example (1) of a data signal according to an embodiment of the present invention. In the resource pool shown in Proposal 1-1), as shown in Figure 9, PSSCH#1, PSSCH#2, or PSSCH#3, the PSSCH or SL-SCH may be transmitted confined to one of the actual CCs and may not be transmitted across multiple actual CCs.

[0078] For example, PSSCH or SL-SCH may be assumed to always be transmitted using a single subchannel, such as PSSCH#2 or PSSCH#3, or it may be transmitted using multiple subchannels, such as PSSCH#1. Transmission using multiple subchannels, such as PSSCH#1, may be limited to and performable within the actual CC. PSSCH transmission or SL-SCH transmission may be limited to contiguous frequency resources within the actual CC, or it may be performed using discontinuous frequency resources. Proposal 3-1) may be combined with either Proposal 2-1) or Proposal 2-2).

[0079] The above proposal 3-1) makes it possible to simplify the data signal transmission and reception process.

[0080] Proposal 3-2) As shown in Figure 9, PSSCH#4, in the resource pool shown in Proposal 1-1), PSSCH or SL-SCH may be transmitted across multiple actual CCs. For example, PSSCH or SL-SCH may be transmitted using multiple subchannels. This operation may be limited to cases where the numerology, i.e., SCS, is the same among the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different among the actual CCs. Proposal 3-2) may be combined with either Proposal 2-1) or Proposal 2-2).

[0081] As proposed in 3-2) above, the resources for transmitting and receiving data signals can be flexibly determined.

[0082] Proposal 3-3) Figure 10 is a diagram illustrating an example (2) of a data signal according to an embodiment of the present invention. As shown in Figure 10, PSSCH#1, in the resource pool shown in Proposal 1-2), PSSCH or SL-SCH may be transmitted confined to one of the actual CCs and not necessarily transmitted across multiple actual CCs. For example, transmission using multiple subchannels may be limited to an actual CC. PSSCH transmission or SL-SCH transmission may be limited to a continuous frequency resource within an actual CC, or it may be performed on a discontinuous frequency resource.

[0083] The above proposal 3-3) can simplify the data signal transmission and reception process.

[0084] Proposal 3-4) As shown in Figure 10, PSSCH or SL-SCH may be transmitted across multiple actual CCs in the resource pool shown in Proposal 1-2). This operation may be limited to cases where the numerology, i.e., SCS, is the same among the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different among the actual CCs.

[0085] As proposed in 3-4) above, the resources for transmitting and receiving data signals can be flexibly determined.

[0086] Proposal 4) Resource reservations may be performed in a resource pool composed of discontinuous frequency resources. Proposal 4) may be combined with any of Proposals 1), 2), and 3).

[0087] Proposal 4-1) Figure 11 is a diagram illustrating an example (1) of resource reservation according to an embodiment of the present invention. A PSCCH / PSSCH resource confined to one of the actual CCs may be specified, as shown in the reservation from PSCCH#2 and PSSCH#2 in Figure 11, or a PSCCH / PSSCH resource spanning multiple actual CCs may not be specified. Note that the term "PSCCH / PSSCH" may mean "PSCCH and / or PSSCH".

[0088] The above proposal 4-1) can simplify the processing related to resource reservations.

[0089] Proposal 4-2) PSCCH / PSSCH resources may be directed across multiple actual CCs, as shown in Figure 11, for reservations from PSCCH#1 and PSSCH#1. This operation may be limited to cases where the numerology, i.e., SCS, is the same across the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different across the actual CCs.

[0090] The above proposal 4-2) allows for flexible resource reservations.

[0091] Proposal 4-3) Figure 12 is a diagram illustrating an example (2) of resource reservation according to an embodiment of the present invention. As shown in Figure 12, the signals for resource reservation from PSCCH#1 and PSSCH#1 may be transmitted from the same actual CC as the resource being reserved, or they may not be transmitted from different actual CCs. For example, all of the resources to be reserved may reside in the same actual CC, or some of the resources to be reserved may reside in the same actual CC.

[0092] The above proposal 4-3) can simplify the processing related to resource reservations.

[0093] Proposal 4-4) As shown in Figure 12, the signal for resource reservation may be transmitted from a different actual CC than the resource being reserved. This operation may be limited to cases where the numerology, i.e., SCS, is the same between the actual CCs. Alternatively, this operation may be performed when the numerology, i.e., SCS, is different between the actual CCs.

[0094] The above proposal 4-4) allows for flexible resource reservations.

[0095] Proposal 4-5) If the numerology, i.e., SCS, differs between actual CCs, the time specification for resource reservation may be any of the following 1)-3).

[0096] 1) It may be specified based on the numerology, i.e., SCS, of the actual CC that sends the signal to reserve a resource. 2) The resource to be reserved may be specified based on the actual CC numerology, i.e., SCS. 3) The actual CC that sends the signal to reserve a resource may be specified based on the smaller or larger numerology, i.e., SCS, of the actual CC of the resource being reserved.

[0097] The above proposals 4-5) clarify the behavior when the numerology, i.e., SCS, differs between the signal that reserves a resource and the actual CC of the reserved resource.

[0098] Proposal 4-6) Different methods from Proposals 4-1), 4-2), 4-3), 4-4), and 4-5) may be applied to periodic resource reservations and non-periodic resource reservations.

[0099] As proposed above (4-6), appropriate methods can be applied to both the reservation of periodic and non-periodic resources, thereby maximizing the effectiveness of an SL resource pool composed of non-continuous frequency resources.

[0100] Proposal 5) A feedback signal (PSFCH) may be transmitted in an SL resource pool composed of discontinuous frequency resources. Proposal 5) may be combined with any of Proposals 1), 2), 3), and 4).

[0101] Furthermore, the PSFCH may be in any format. The PSFCH resource may be sent and received at the end of a slot excluding gap symbols, or it may be sent and received at any time resource. For example, the PSFCH may be sent and received at all or some symbols in a slot. For example, the PSFCH may be used for HARQ feedback, for collision notification in inter-UE coordination, or for other information transmission.

[0102] Proposal 5-1) The PSFCH transmission resource for PSCCH / PSSCH reception may be determined by any of the following methods 1)-3).

[0103] 1) May be set or determined in association with the PSCCH / PSSCH resource. 2) The PSFCH transmission resource corresponding to PSCCH / PSSCH reception may be determined or specified by the PSCCH / PSSCH transmission UE. 3) The PSFCH transmission resource corresponding to PSCCH / PSSCH reception may be determined or specified by the PSFCH transmission UE.

[0104] As described in 1) above, it becomes easier to obtain a common understanding of PSFCH resources among UEs. Furthermore, as described in 2) and 3) above, PSFCH resources can be determined flexibly.

[0105] Proposal 5-2) Figure 13 is a diagram illustrating an example (1) of HARQ feedback according to an embodiment of the present invention. Any of the following rules 1)-6) may be applied to the PSCCH / PSSCH receiving resource and the PSFCH transmitting resource.

[0106] 1) As shown in Figure 13, the PSCCH / PSSCH receiving resource and the PSFCH transmitting resource may be located in the same actual CC.

[0107] 2) As shown in Figure 13, the PSCCH / PSSCH receiving resource and the PSFCH transmitting resource may be located in different actual CCs, such as the PSCCH#1 / PSSCH#1 and corresponding PSFCH.

[0108] 3) If the PSCCH / PSSCH reception is a groupcast or broadcast, and multiple PSCCH / PSSCH receiving UEs use different PSFCH transmission resources, each PSFCH transmission resource may be placed in the same actual CC.

[0109] 4) If the PSCCH / PSSCH reception is a groupcast or broadcast, and multiple PSCCH / PSSCH receiving UEs use different PSFCH transmission resources, each PSFCH transmission resource may be placed in a different actual CC.

[0110] 5) Paragraphs 2) and 4) above may be applied only when the numerology, i.e., the SCS, is the same between the actual CCs.

[0111] 6) The above 2) and 4) may apply when the numerology, i.e., SCS, differs between actual CCs.

[0112] As described in 1), 3), and 5) above, UE operation can be simplified. As described in 2), 4), and 6) above, PSFCH resources can be configured flexibly.

[0113] Proposal 5-3) Figure 14 is a diagram illustrating an example (2) of HARQ feedback according to an embodiment of the present invention. As shown in Figure 14, the PSFCH opportunity may be the same time resource between actual CCs.

[0114] The above proposal 5-3) can simplify the process of determining PSFCH opportunities.

[0115] Proposal 5-4) Figure 15 is a diagram illustrating an example (3) of HARQ feedback according to an embodiment of the present invention. As shown in Figure 15, the PSFCH opportunity may be a different time resource between actual CCs. In the example in Figure 15, a PSFCH opportunity is set every 2 slots in actual CC#1, and a PSFCH opportunity is set every 4 slots in actual CC#0.

[0116] The above proposal 5-4) allows for flexible configuration of the PSFCH, enabling a favorable balance between low latency and overhead.

[0117] Proposal 5-5) When the numerology, i.e., SCS, differs between actual CCs, the number of PSFCH symbols may be determined based on the numerology, i.e., SCS. For example, the minimum numerology, i.e., SCSμ, excluding the copy symbols for AGC. minThe number of PSFCH symbols in is set to 1, and the number of PSFCH symbols in numerology, i.e., SCSμ, is set to 2. μ-μmin That is also acceptable.

[0118] Furthermore, the minimum time gap between PSCCH / PSSCH reception and PSFCH transmission may be determined based on numerology, i.e., SCS. For example, this minimum time gap may be determined based on numerology, i.e., SCS, in the actual CC of PSCCH / PSSCH reception. For example, this minimum time gap may be determined based on numerology, i.e., SCS, in the actual CC of PSFCH transmission.

[0119] The above proposal 5-5) clarifies the feedback behavior when the numerology, i.e., SCS, differs between actual CCs.

[0120] Proposal 5-6) UE capabilities and UE operations related to simultaneous PSFCH transmission and / or simultaneous reception may be defined or executed for each actual CC, or for the entire resource pool or for multiple actual CCs.

[0121] Proposal 6) In an SL resource pool composed of discontinuous frequency resources, the availability and method of use of the resource pool may be determined based on UE capabilities.

[0122] Proposal 6-1) Only UEs that can use all of the actual CCs included in the SL resource pool may be allowed to use the SL resource pool. For example, UEs that can use some of the actual CCs included in the SL resource pool may not be permitted to use the SL resource pool.

[0123] The above proposal 6-1) makes it possible to maintain high communication quality in an SL resource pool composed of discontinuous frequency resources. It also makes it possible to avoid cases where there are UEs whose reservations are not detected due to UE capabilities.

[0124] Proposal 6-2) UEs that can use at least some of the actual CCs included in the SL resource pool may also use the SL resource pool. For example, Proposal 6-2) may apply in cases where the transmission and reception of various signals and resource reservations are performed confined within the actual CCs, i.e., in Proposal 1-1), Proposal 2-1), Proposal 3-1), Proposal 4-1), Proposal 4-3), and Proposal 5-2) 1).

[0125] As proposed in 6-2) above, UEs that support only a limited frequency band (e.g., low-cost UEs, power-saving UEs, etc.) can also use SL resource pools composed of discontinuous frequency resources.

[0126] Whether Proposal 6-3), Proposal 6-1), or Proposal 6-2) applies may be determined based on the settings related to the SL resource pool in question.

[0127] As proposed in 6-3) above, the usage method can be determined based on the service or quality to be achieved with an SL resource pool composed of discontinuous frequency resources.

[0128] Proposal 7) In an SL resource pool composed of discontinuous frequency resources, S-SSB (Sidelink SS / PBCH Block) transmission may be performed. The operation related to S-SSB is described below, but different operations may be applied to S-PSS (Sidelink Primary Synchronization Signal), S-SSS (Sidelink Secondary Synchronization Signal), and PSBCH (Physical Sidelink Broadcast Channel). Note that Proposal 7) may be combined with any of Proposals 1), 2), 3), 4), 5), and 6).

[0129] Proposal 7-1) S-SSB may be transmitted in a predetermined actual CC. For example, an actual CC that performs S-SSB transmission may be set up.

[0130] The above proposal 7-1) clarifies the CCs on which S-SSB transmissions are performed, allowing for a common understanding among UEs.

[0131] Proposal 7-2) Figure 16 is a diagram illustrating an example (1) of an S-SSB according to an embodiment of the present invention. As shown in S-SSB #1 in Figure 16, the S-SSB may be transmitted to one actual CC and may not be transmitted across multiple actual CCs. For example, the information transmitted in the S-SSB (e.g., TDD settings, slot index) may be information relating to the actual CC to which the S-SSB is transmitted, or information relating to any of the actual CCs in the resource pool.

[0132] The above proposal 7-2) allows for a simplification of the S-SSB configuration.

[0133] Proposal 7-3) As shown in Figure 16, S-SSB may be transmitted across multiple actual CCs, such as S-SSB#2. For example, this may be limited to cases where the numerology, i.e., SCS, is the same across the actual CCs, or the numerology, i.e., SCS, may be different across the actual CCs. For example, the information transmitted in the S-SSB (e.g., TDD settings, slot index) may relate to at least one of the actual CCs to which the S-SSB is transmitted, or it may relate to any of the actual CCs in the resource pool.

[0134] As proposed in 7-3) above, resources for S-SSB can be configured flexibly.

[0135] Proposal 7-4) Figure 17 is a diagram illustrating an example (2) of S-SSB according to an embodiment of the present invention. As shown in Figure 17, in an actual CC where S-SSB is not transmitted, it may be possible to transmit and receive PSCCH, PSSCH, or PSFCH in the slot where S-SSB is transmitted. In existing technology, the slot where S-SSB is transmitted is not included in the resource pool and could not be used for transmitting and receiving PSCCH, PSSCH, or PSFCH.

[0136] For example, the slots to which S-SSB is transmitted may also be included in the resource pool, and the number of slot offsets for resource reservations or PSFCH opportunities may be counted. For example, if a periodic resource reservation indicates an S-SSB resource, the resource reservation may not be executed, and it may be assumed that a resource reservation for the next available slot has been instructed.

[0137] For example, simultaneous transmission or reception of S-SSB with PSCCH, PSSCH, or PSFCH may be possible. Priority-related processing may be performed with S-SSB having the highest priority (smallest priority value). Operation may be determined based on UE capabilities. Also, as in the actual CC#1 shown in Figure 17, for example, the resource of the actual CC to which S-SSB is transmitted may or may not be included in the resource pool, or it may be treated as if it were included.

[0138] As proposed above (7-4), resources can be used efficiently without waste.

[0139] The above-described embodiment may be applied to D2D of NR, or to D2D of other RATs. Furthermore, the above-described embodiment may be applied to FR2, or to other frequency bands.

[0140] The above-described embodiment is not limited to V2X terminals, but may also be applied to terminals that perform D2D communication.

[0141] The operation described in the above embodiment may be performed only in a specific resource pool. For example, it may be performed only in resource pools where terminal 20 with 3GPP release 17 or 3GPP release 18 or later is available.

[0142] In the embodiment described above, terminal 20 can communicate using a resource pool composed of discontinuous frequency resources.

[0143] In other words, in direct communication between terminals, it is possible to use wideband resources that are discontinuous in the frequency domain.

[0144] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to implement the embodiments described above. However, the base station 10 and terminal 20 may each have only some of the functions in the embodiments.

[0145] <Base station 10> Figure 18 shows an example of the functional configuration of a base station 10. As shown in Figure 18, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 18 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0146] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information from a higher layer. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, etc. to the terminal 20.

[0147] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads it from the storage device as needed. The contents of the setting information include, for example, information related to D2D communication settings.

[0148] As described in the embodiment, the control unit 140 performs processing related to the settings for the terminal 20 to perform D2D communication. The control unit 140 also transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110. The control unit 140 also receives information related to the HARQ response of D2D communication and DL communication from the terminal 20 via the reception unit 120. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120.

[0149] <Terminal 20> Figure 19 is a diagram showing an example of the functional configuration of terminal 20. As shown in Figure 19, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 19 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0150] The LTE-SL transmission / reception mechanism (module) and the NR-SL transmission / reception mechanism (module) described above may each separately have a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240.

[0151] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 220 also has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals transmitted from the base station 10. For example, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20 as D2D communication, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0152] The setting unit 230 stores various setting information received from the base station 10 or terminal 20 by the receiving unit 220 in its storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-configured setting information. The content of the setting information is, for example, information related to D2D communication settings.

[0153] As described in the embodiment, the control unit 240 controls D2D communication to establish an RRC connection with other terminals 20. The control unit 240 also performs power-saving operations. The control unit 240 also performs HARQ processing for D2D and DL communication. The control unit 240 transmits information related to the HARQ response for D2D and DL communication scheduled from the base station 10 to the base station 10. The control unit 240 may also schedule D2D communication with other terminals 20. The control unit 240 may also autonomously select resources to be used for D2D communication from a resource selection window based on sensing results, or it may perform re-evaluation or preemption. The control unit 240 also performs power-saving processing for D2D communication transmission and reception. The control unit 240 also performs processing related to inter-terminal coordination in D2D communication. The signal transmission function unit of the control unit 240 may be included in the transmission unit 210, and the signal reception function unit of the control unit 240 may be included in the reception unit 220.

[0154] (Hardware configuration) The block diagrams (Figures 18 and 19) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the one or more devices with software.

[0155] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0156] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 20 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0157] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0158] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0159] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0160] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 18 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 19 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0161] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0162] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0163] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include high-frequency switches, duplexers, filters, frequency synthesizers, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0164] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0165] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0166] Furthermore, the base station 10 and terminal 20 may 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), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0167] Figure 21 shows an example of the configuration of vehicle 2001. As shown in Figure 21, vehicle 2001 comprises a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0168] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0169] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0170] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0171] The Information Services Unit 2012 consists of various devices for providing various types of information, such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0172] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0173] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0174] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0175] The communication module 2013 transmits current signals from current sensors input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits, via wireless communication, other signals input to the electronic control unit 2010, including front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0176] The communication module 2013 receives various information (traffic information, signal information, distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 installed in the vehicle 2001. The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., installed in the vehicle 2001.

[0177] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a terminal is provided which includes a receiving unit that receives a signal from another terminal in any subchannel included in a resource pool composed of discontinuous frequency resources, a transmitting unit that transmits a signal to another terminal in any subchannel included in the resource pool, and a control unit that determines which of the actual component carriers the subchannels constituting the resource pool are included in, wherein the transmitting unit transmits a feedback signal in the resource pool corresponding to the signal received by the receiving unit.

[0178] With the above configuration, terminal 20 can communicate using a resource pool composed of discontinuous frequency resources. In other words, in direct communication between terminals, it can use broadband resources that are discontinuous in the frequency domain.

[0179] The transmitting unit may transmit the feedback signal using the resource associated with the signal received by the receiving unit. With this configuration, the terminal 20 can communicate using a resource pool composed of discontinuous frequency resources.

[0180] The transmitting unit may transmit the feedback signal on the actual component carrier where the receiving unit has received the signal. With this configuration, the terminal 20 can communicate using a resource pool composed of discontinuous frequency resources.

[0181] The transmitting unit may transmit the feedback signal on an actual component carrier different from the actual component carrier on which the receiving unit received the signal. With this configuration, the terminal 20 can communicate using a resource pool composed of discontinuous frequency resources.

[0182] The control unit may assume that the opportunity to transmit the feedback signal may be set to different time resources among the actual component carriers. This configuration allows terminal 20 to communicate using a resource pool composed of discontinuous frequency resources.

[0183] Furthermore, according to embodiments of the present invention, a communication method is provided in which a terminal performs a receiving procedure to receive a signal from another terminal in any subchannel included in a resource pool composed of discontinuous frequency resources; a transmitting procedure to transmit a signal to another terminal in any subchannel included in the resource pool; a control procedure to determine which of the actual component carriers the subchannel constituting the resource pool is included in; and a procedure to transmit a feedback signal in the resource pool corresponding to the received signal.

[0184] With the above configuration, terminal 20 can communicate using a resource pool composed of discontinuous frequency resources. In other words, in direct communication between terminals, it can use broadband resources that are discontinuous in the frequency domain.

[0185] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0186] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0187] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0188] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0189] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0190] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0191] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0192] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0193] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0194] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0195] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0196] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0197] The terms “system” and “network” as used in this disclosure are interchangeable.

[0198] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or corresponding other information. For example, wireless resources may be indicated by an index.

[0199] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0200] In this disclosure, terms such as "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", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0201] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0202] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0203] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0204] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0205] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0206] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0207] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0208] The terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0209] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0210] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0211] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0212] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0213] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0214] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0215] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0216] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a numerology-based time unit.

[0217] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0218] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0219] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0220] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0221] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0222] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0223] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0224] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0225] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers in an RB may be determined based on numerology.

[0226] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0227] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0228] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0229] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given numerology within a carrier. These common RBs may be identified by an index of the RBs relative to the carrier's common reference point. A Bandwidth Part (PRB) may be defined and numbered within a BWP.

[0230] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0231] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0232] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0233] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0234] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0235] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0236] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of Symbols]

[0237] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Front Wheel 2008 Rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. A receiving unit that receives signals from other terminals in any subchannel included in a resource pool composed of discontinuous frequency resources, In any of the subchannels included in the resource pool, a transmitting unit that transmits signals to other terminals, The system includes a control unit that determines which of the actual component carriers a subchannel constituting the resource pool is included in, The transmitting unit is a terminal that transmits a feedback signal corresponding to the signal received by the receiving unit in the resource pool.

2. The terminal according to claim 1, wherein the transmitting unit transmits the feedback signal using a resource associated with the signal received by the receiving unit.

3. The terminal according to claim 1, wherein the transmitting unit transmits the feedback signal in the actual component carrier where the receiving unit has received the signal.

4. The terminal according to claim 1, wherein the transmitting unit transmits the feedback signal on an actual component carrier that is different from the actual component carrier on which the receiving unit received the signal.

5. The terminal according to claim 1, wherein the control unit assumes that the opportunity to transmit the feedback signal may be set to different time resources among the actual component carriers.

6. A receiving procedure for receiving signals from other terminals on any subchannel included in a resource pool composed of discontinuous frequency resources, A transmission procedure for transmitting a signal to another terminal in any of the subchannels included in the resource pool, A control procedure for determining which of the actual component carriers constitutes the resource pool, A communication method in which a terminal performs the procedure of transmitting a feedback signal corresponding to the received signal in the resource pool.

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