Communication device, control device, and communication system

Abstract

A communication device is provided, including: a communication unit that performs wireless communication; and a control unit that controls an operation of sensing resources used in a communication method for performing inter-device communication with other devices, wherein the control unit controls to sense the resources in a predetermined minimum unit on a time axis.

Description

Technical Field

[0001] The present disclosure relates to a communication device, a control device, and a communication system. Background Art

[0002] In order to achieve future autonomous driving, expectations for vehicle-to-everything (V2X) communication have been increasing in recent years. V2X communication is an abbreviation for vehicle-to-X communication, which is a system for communication between a vehicle and "something". Examples of "something" here include vehicles, infrastructure, networks, and pedestrians (also referred to as V2V, V2I, V2N, and V2P, respectively). For example, Patent Document 1 discloses an example of a technique related to V2X communication.

[0003] Regarding radio communication for vehicles, the development of dedicated short-range communication (DSRC) based on 802.11p has been mainly promoted. However, in recent years, the standardization of LTE-based vehicle communication (i.e., "LTE-based V2X") has been promoted. LTE-based V2X communication supports the exchange of basic safety messages and the like.

[0004] Citation List

[0005] Patent Document

[0006] Patent Document 1: JP 2017-208796 A Summary of the Invention

[0007] Technical Problem

[0008] At the same time, a communication method using New Radio (NR) (i.e., NR V2X communication) employs a different mechanism from LTE-based V2X communication. This results in the possibility that it is difficult to perform resource sensing in the same manner as used in LTE-based V2X communication.

[0009] In view of this situation, the present disclosure proposes novel and improved communication devices, control devices, and communication systems capable of efficiently sensing resources in NR V2X communication.

[0010] Solution to the Problem

[0011] According to the present disclosure, there is provided a communication device including: a communication unit that performs radio communication; and a control unit that controls an operation of sensing resources to be used in a communication method for device-to-device communication with other devices, wherein the control unit controls to sense resources in a predetermined minimum unit on a time axis.

[0012] Furthermore, according to the present disclosure, there is provided a control device including: a communication unit that performs radio communication with a terminal device; and a control unit that controls to notify information for controlling an operation of a sensing resource from the communication unit, and uses the resource in a communication mode for performing device-to-device communication between the terminal device and other devices, wherein the control unit causes the communication unit to notify the terminal device of information for controlling to sense the resource in a predetermined minimum unit on the time axis.

[0013] Moreover, according to the present disclosure, there is provided a communication system including at least two communication devices according to claim 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an explanatory diagram showing an example of a schematic configuration of a system according to an embodiment of the present disclosure.

[0015] Figure 2 It is a block diagram showing an example of a configuration of a base station according to the same embodiment.

[0016] Figure 3 It is a block diagram showing an example of a configuration of a terminal device according to the same embodiment.

[0017] Figure 4 It is a diagram showing an outline of V2X communication.

[0018] Figure 5 It is an explanatory diagram showing an example of an overall concept of V2X communication.

[0019] Figure 6 It is a diagram showing an example of a use case of V2X communication.

[0020] Figure 7 It is an explanatory diagram showing an example of a V2X operation scenario.

[0021] Figure 8 It is an explanatory diagram showing an example of a V2X operation scenario.

[0022] Figure 9 It is an explanatory diagram showing an example of a V2X operation scenario.

[0023] Figure 10 It is an explanatory diagram showing an example of a V2X operation scenario.

[0024] Figure 11 It is an explanatory diagram showing an example of a V2X operation scenario.

[0025] Figure 12 It is an explanatory diagram showing an example of a V2X operation scenario.

[0026] Figure 13It is a diagram showing a configuration example of resources allocated for sidelink communication.

[0027] Figure 14 It is an explanatory diagram showing an example of the operation timeline when a terminal device transmits a packet based on mode 4 resource allocation.

[0028] Figure 15 It is an explanatory diagram showing the sensing operation in LTE V2X.

[0029] Figure 16 It is an explanatory diagram showing the sensing operation in LTE V2X in more detail.

[0030] Figure 17 It is a flowchart showing an example of the operation of a terminal device.

[0031] Figure 18 It is an explanatory diagram showing an example of the NR frame structure.

[0032] Figure 19 It is an explanatory diagram showing an example of a resource grid.

[0033] Figure 20 It is an explanatory diagram showing an example of a slot format.

[0034] Figure 21 It is an explanatory diagram showing an example of a slot format.

[0035] Figure 22 It is an explanatory diagram showing an example of the sensing of a resource pool in which different parameter sets (numerologies) coexist.

[0036] Figure 23 It is an explanatory diagram showing an example of a terminal device selecting resources in units of PRBs.

[0037] Figure 24 It is an explanatory diagram showing an example of a terminal device selecting resources in units of the transmission resource block size as the minimum unit.

[0038] Figure 25A It is an explanatory diagram showing an example of the configuration of a resource pool when different parameter sets coexist.

[0039] Figure 25B It is an explanatory diagram showing an example of the configuration of a resource pool when different parameter sets coexist.

[0040] Figure 25C It is an explanatory diagram showing an example of the configuration of a resource pool when different parameter sets coexist.

[0041] Figure 26 It is an explanatory diagram showing an example of the NR slot format of the NR sidelink.

[0042] Figure 27 It is an explanatory diagram showing sensing at the symbol level.

[0043] Figure 28 It is an explanatory diagram showing an example of hybrid sensing according to the present embodiment.

[0044] Figure 29 It is a flowchart showing an example of the operation of an NR UE according to the present embodiment.

[0045] Figure 30 It is an explanatory diagram showing an example indicating relevant NR data in both NR SA and LTE SA.

[0046] Figure 31 It is an explanatory diagram showing a scenario in which an NR UE notifies an LTE UE of transmission resources and reservation information for NR data.

[0047] Figure 32 It is an explanatory diagram showing a scenario in which a base station notifies an LTE UE of the resource usage status and reservation information of a mode 3 NR UE.

[0048] Figure 33 It is an explanatory diagram showing an example in which a base station notifies an LTE UE of the resource usage status and reservation information of a mode 4 NR UE.

[0049] Figure 34 It is a flowchart showing an example of the operation of an NR UE according to the present embodiment.

[0050] Figure 35 It is a block diagram showing a first example of the schematic configuration of an eNB.

[0051] Figure 36 It is a block diagram showing a second example of the schematic configuration of an eNB.

[0052] Figure 37 It is a block diagram showing an example of the schematic configuration of a smart phone.

[0053] Figure 38 It is a block diagram showing an example of the schematic configuration of a car navigator. Detailed Description of the Embodiment

[0054] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. Note that redundant descriptions will be omitted from the present specification and the drawings by assigning the same reference numerals to components having substantially the same functional configurations.

[0055] Note that the description will be provided in the following order.

[0056] 1. Configuration Example

[0057] 1.1. Example of System Configuration

[0058] 1.2. Example of Base Station Configuration

[0059] 1.3. Example of Terminal Device Configuration

[0060] 2. V2X Communication

[0061] 3. Method for Allocating Resources to Sidelink

[0062] 4. NR Frame Structure

[0063] 5. Resource Grid

[0064] 6. Time Slot Format

[0065] 7. Changing the Unit for Sensing Each of the Parameter Sets and Frame Structures

[0066] 8. Coexistence of LTE V2X and NR V2X

[0067] 9. Application Examples

[0068] 9.1. Application Examples Related to Base Stations

[0069] 9.2. Application Examples Related to Terminal Devices

[0070] 10. Summary

[0071] "1. Configuration Examples"

[0072] "<1.1. Example of System Configuration>"

[0073] First, reference will be made to Figure 1 describe an example of the schematic configuration of System 1 according to an embodiment of the present disclosure. Figure 1 is an explanatory diagram illustrating an example of the schematic configuration of System 1 according to an embodiment of the present disclosure. As Figure 1 shown, System 1 includes a radio communication device 100 and a terminal device 200. Herein, the terminal device 200 is also referred to as a user. The user may also be referred to as a UE. The radio communication device 100C is also referred to as a UE repeater. The UE herein may be a UE defined in LTE or LTE-A, and the UE repeater may be a Prose UEtoNetworkRelay (Plain UE to Network Repeater) discussed in 3GPP, or may more generally represent a communication device.

[0074] (1) Radio Communication Device 100

[0075] The radio communication device 100 is a device that provides radio communication services to devices under the control of the device. For example, the radio communication device 100A is a base station of a cellular system (or a mobile communication system). The base station 100A performs radio communication with devices (e.g., the terminal device 200A) located within the cell 10A of the base station 100A. For example, the base station 100A transmits a downlink signal to the terminal device 200A and receives an uplink signal from the terminal device 200A.

[0076] The base station 100A is logically connected to another base station via, for example, the X2 interface and can transmit and receive control information and the like. In addition, the base station 100A is logically connected to a core network (not shown) via, for example, the S1 interface and can transmit and receive control information and the like. The communication between these devices can be physically relayed by various devices.

[0077] Here, Figure 1 The radio communication device 100A shown in is a macro cell base station, and the cell 10A is a macro cell. In contrast, the radio communication devices 100B and 100C are master devices that operate the small cells 10B and 10C, respectively. As an example, the master device 100B is a fixedly installed small cell base station. The small cell base station 100B establishes a wireless backhaul link with the macro cell base station 100A while establishing an access link with one or more terminal devices (e.g., the terminal device 200B) within the small cell 10B. The radio communication device 100B can be a relay node defined by 3GPP. The master device 100C is a dynamic access point (AP). The dynamic AP 100C is a mobile device that dynamically operates the small cell 10C. The dynamic AP 100C establishes a wireless backhaul link with the macro cell base station 100A while establishing an access link with one or more terminal devices (e.g., the terminal device 200C) within the small cell 10C. The dynamic AP 100C can be, for example, a terminal device equipped with hardware or software capable of operating as a base station or a wireless access point. In this case, the small cell 10C is a dynamically formed local network / virtual cell.

[0078] The cell 10A can operate according to any type of radio communication method (such as LTE, LTE-Advanced (LTE-A), LTE-ADVANCED PRO, GSM (registered trademark), UMTS, W-CDMA, CDMA2000, WiMAX, WiMAX2, or IEEE802.16).

[0079] Note that a small cell is a concept that can include various types of cells smaller than a macro cell (e.g., femto cell, nano cell, pico cell, or micro cell) arranged to overlap or not overlap with the macro cell. In one example, the small cell is operated by a dedicated base station. In another example, the small cell is operated by a terminal that is a main device temporarily operating as a small cell base station. A node called a relay node can also be defined as an aspect of the small cell base station. The radio communication device of the main station serving as the relay node is also referred to as the donor base station. The donor base station can represent the DeNB in LTE, or more generally the main station of the relay node.

[0080] (2) Terminal device 200

[0081] The terminal device 200 can perform communication in a cellular system (or mobile communication system). The terminal device 200 performs radio communication with the radio communication device of the cellular system (e.g., base station 100A, main device 100B, or 100C). For example, the terminal device 200A receives a downlink signal from the base station 100A and transmits an uplink signal to the base station 100A.

[0082] In addition, the terminal device 200 is not limited to a terminal called a UE, and can be used as, for example, a low-cost terminal (low-cost UE), such as an MTC terminal, an enhanced MTC (eMTC) terminal, and an NB-IoT terminal. In addition, infrastructure terminals such as roadside units (RSUs) or terminals such as customer premise equipment (CPE) are allowed.

[0083] (3) Supplementary description

[0084] Although the schematic configuration of system 1 has been illustrated above, the present technology is not limited to Figure 1 the examples shown. For example, system 1 can have a configuration such as not including a main device, or a configuration such as small cell enhancement (SCE), heterogeneous network (HetNet), MTC network, etc. In addition, as another example of the configuration of system 1, the main device can be connected to a small cell and the cell can be constructed under the small cell.

[0085] <1.2. Configuration example of the base station>

[0086] Next, the configuration of the base station 100 according to an embodiment of the present disclosure will be described with reference to Figure 2 is a block diagram illustrating an example of the configuration of the base station 100 according to an embodiment of the present disclosure. Referring to Figure 2 Figure 2 Figure 2 , the base station 100 includes an antenna unit 110, a radio communication unit 120, a network communication unit 130, a storage unit 140, and a control unit 150.

[0087] (1) Antenna unit 110

[0088] The antenna unit 110 radiates the signal output by the radio communication unit 120 into space as radio waves. In addition, the antenna unit 110 converts the radio waves in space into a signal and outputs the signal to the radio communication unit 120.

[0089] (2) Radio communication unit 120

[0090] The radio communication unit 120 transmits and receives signals. For example, the radio communication unit 120 transmits a downlink signal to the terminal device and receives an uplink signal from the terminal device.

[0091] (3) Network communication unit 130

[0092] The network communication unit 130 transmits and receives information. For example, the network communication unit 130 transmits information to another node and receives information from another node. For example, other nodes include other base stations and core network nodes.

[0093] As described above, in the system 1 according to the present embodiment, in some cases, the terminal device can operate as a relay terminal and relay the communication between the remote terminal and the base station. In this case, for example, the radio communication device 100C corresponding to the relay terminal does not have to include the network communication unit 130.

[0094] (4) Storage unit 140

[0095] The storage unit 140 temporarily or permanently stores programs and various types of data for the operation of the base station 100.

[0096] (5) Control unit 150

[0097] The control unit 150 provides various functions of the base station 100. The control unit 150 includes a communication control unit 151, an information acquisition unit 153, and a notification unit 155. The control unit 150 may also include other components in addition to these components. That is, the control unit 150 may perform operations other than the operations of these components.

[0098] The communication control unit 151 performs various processes related to the control of radio communication with the terminal device 200 via the radio communication unit 120. In addition, the communication control unit 151 performs various processes related to the control of communication with other nodes (such as other base stations, core network nodes, etc.) via the network communication unit 130.

[0099] The information acquisition unit 153 acquires various types of information from the terminal device 200 and other nodes. The acquired information can be used, for example, to control radio communication with the terminal device, control cooperation with other nodes, etc.

[0100] The notification unit 155 notifies various types of information to the terminal device 200 and other nodes. As a specific example, the notification unit 155 can notify the terminal device of various types of information required for the terminal device in the cell to perform radio communication with the base station. In addition, as another example, the notification unit 155 can notify another node (e.g., another base station) of the information acquired from the terminal device in the cell.

[0101] <1.3. Configuration Example of Terminal Device>

[0102] Next, a configuration example of the terminal device 200 according to an embodiment of the present disclosure will be described with reference to Figure 3 FIG. illustrates a configuration example of the terminal device 200 according to an embodiment of the present disclosure. Figure 3 is a block diagram showing an example of the configuration of the terminal device 200 according to an embodiment of the present disclosure. As shown in Figure 3 FIG., the terminal device 200 includes an antenna unit 210, a radio communication unit 220, a storage unit 230, and a control unit 240.

[0103] (1) Antenna Unit 210

[0104] The antenna unit 210 radiates the signal output by the radio communication unit 220 into space as radio waves. In addition, the antenna unit 210 converts the radio waves in space into a signal and outputs the signal to the radio communication unit 220.

[0105] (2) Radio Communication Unit 220

[0106] The radio communication unit 220 transmits and receives signals. For example, the radio communication unit 220 receives a downlink signal from the base station and transmits an uplink signal to the base station.

[0107] In addition, in the system 1 according to the present embodiment, in some cases, the terminal device 200 directly communicates with another terminal device 200 without the intervention of the base station 100. In this case, the radio communication unit 220 can transmit and receive sidelink signals to and from another terminal device 200.

[0108] (3) Storage Unit 230

[0109] The storage unit 230 temporarily or permanently stores programs and various data for the operation of the terminal device 200.

[0110] (4) Control Unit 240

[0111] The control unit 240 provides various functions of the terminal device 200. For example, the control unit 240 includes a communication control unit 241, an information acquisition unit 243, and a notification unit 247. The control unit 240 may also include other components in addition to these components. That is, the control unit 240 can perform operations other than the operations of these components.

[0112] The communication control unit 241 performs various processes related to the control of radio communication with the base station 100 and another terminal device 200 via the radio communication unit 220. For example, the communication control unit 241 can reserve resources to be used for the transmission of packets. In addition, the communication control unit 241 can select a part of the reserved resources and control to use the selected resources to transmit packets.

[0113] In addition, the communication control unit 241 can make a predetermined determination based on the information acquired from the base station 100 or another terminal device 200. As a more specific example, the communication control unit 241 can determine whether a packet can be transmitted to another terminal device 200. In addition, at this time, the communication control unit 241 can determine whether to discard the packet planned to be transmitted to another terminal device 200.

[0114] The information acquisition unit 243 acquires various types of information from the base station 100 and other terminal devices 200. As a specific example, the information acquisition unit 243 can acquire information related to another terminal device 200 (for example, reception ability, etc.) from another terminal device 200. In addition, the information acquisition unit 243 can acquire various types of information for selecting resources to be used for communication with another terminal device 200 from the base station 100 or another terminal device 200. As a more specific example, the information acquisition unit 243 can acquire information related to the resources reserved by another terminal device 200 from another terminal device 200.

[0115] The notification unit 247 notifies various types of information to the base station 100 and other terminal devices 200. As a specific example, the notification unit 247 can notify another terminal device 200 (for example, the terminal device 200 that transmits data or packets to it) of information related to the data or packets planned to be transmitted. In addition, the notification unit 247 can notify another terminal device 200 of information related to the resources reserved for the transmission of packets.

[0116] 《2. V2X Communication》

[0117] Next, an overview of V2X communication will be described. V2X communication is an abbreviation for vehicle-to-X communication, which is a system for communication between a vehicle and "something". For example, Figure 4 is a diagram showing an overview of V2X communication. For example, asFigure 4 As shown, examples of "something" here include vehicles, infrastructure, networks, and pedestrians (also known as V2V, V2I, V2N, and V2P respectively).

[0118] (The overall concept of V2X communication)

[0119] Figure 5 is an explanatory diagram showing examples of the overall concept of V2X communication. In Figure 5 the example shown, the V2X application server (APP server) is maintained as a cloud server, and this application server controls V2X communication on the core network side. The base station performs Uu link communication with the terminal device while performing communication control for direct communication (such as V2V communication and V2P communication). In addition to the base station, roadside units (RSUs) are also deployed as roadside infrastructure. There are two possible types of RSUs, namely, base station type RSUs and UE type RSUs. A V2X application (V2X APP) will be provided, and support (such as data relay) will be provided for the RSUs.

[0120] (Use cases of V2X communication)

[0121] Regarding radio communication for automobiles, the development of dedicated short-range communication (DSRC) based on 802.11p has been mainly promoted. However, in recent years, the standardization of LTE-based vehicle communication (i.e., "LTE-based V2X communication (or simply referred to as LTE-based V2X)") has been promoted. LTE-based V2X communication supports the exchange of basic safety messages and so on. On the other hand, for the purpose of further enhancing V2X communication, NR V2X communication using 5G technology (New Radio (NR)) has been discussed in recent years. For example, Figure 6 is a diagram showing examples of use cases of V2X communication.

[0122] NR V2X communication supports new use cases that require high reliability, low latency, high-speed communication, and high capacity, which were previously difficult to support with LTE-based V2X. In Figure 6 the specific examples of use cases among the examples shown include providing dynamic maps, remote driving, etc. In addition to this, there are other use cases, such as sensor data sharing where sensor data is exchanged as vehicle-to-vehicle communication or road-to-vehicle communication, and a platooning use case for platooning. The use cases and requirements for such NR V2X communication are specified in 3GPP TR 22.886. For reference, the outline of examples of use cases will be described below.

[0123] (1) Vehicle platooning

[0124] This is a use case for vehicle platooning, in which multiple vehicles form a platoon and travel in the same direction. In this use case, information for controlling the platoon is exchanged between the vehicle leading the platoon and other vehicles. Through this information exchange, for example, it is possible to further reduce the distance between the vehicles in the platoon.

[0125] (2) Extended sensors

[0126] This is a use case in which sensor-related information (raw data before data processing and processed data) can be exchanged on a vehicle-to-vehicle basis. Sensor information is collected through local sensors, live video images (e.g., live video images between the vehicle itself and surrounding vehicles, RSU, or pedestrians), V2X application servers, etc. The exchange of this information enables the vehicle to obtain information that cannot be obtained from its own sensor information, thus making it possible to sense / recognize a wider environment. Note that this use case requires the exchange of a large amount of information, so a high data rate for communication is needed.

[0127] (3) Advanced driving

[0128] This is a use case that enables partial autonomous driving and full autonomous driving. In this use case, the RSU shares the sensed / recognized information obtained from its own sensors, etc., with surrounding vehicles, enabling each vehicle to adjust its trajectory and operation synchronously with other vehicles. In addition, each vehicle can share its driving intentions and plans with adjacent vehicles.

[0129] (4) Remote driving

[0130] This is a use case that allows a remote control operator or V2X application to perform remote control. Remote control is used when another person drives on behalf of a person with driving difficulties or when operating a vehicle in a dangerous area. For example, cloud-based maneuvers are applicable to public transportation where the route and road are fixed to some extent. In this use case, the communication requires high reliability and low transmission latency.

[0131] (Physical layer enhancement)

[0132] To meet the above requirements, the physical layer in LTE V2X needs to be further enhanced. The target links include the Uu link and the PC5 link (sidelink). The Uu link is the link between infrastructure such as a base station or roadside unit (RSU) and a terminal device. The PC5 link (sidelink) is the link between terminal devices. The key points of the enhancement are described below.

[0133] Examples of enhancements include:

[0134] · Channel format

[0135] · Sidelink feedback communication

[0136] · Sidelink resource allocation method

[0137] · Vehicle position information estimation technology

[0138] · Relay communication between terminals

[0139] · Support for unicast and multicast communications

[0140] · Multi-carrier communication, carrier aggregation

[0141] · MIMO / Beamforming

[0142] · Frequency support for high frequencies (example: 6 GHz or higher)

[0143] In addition, examples of channel formats include a flexible parameter set, short transmission time intervals (TTIs), multi-antenna support, and waveforms. In addition, examples of sidelink feedback communication include HARQ and channel state information (CSI).

[0144] (V2X operation scenario)

[0145] Examples of V2X communication operation scenarios are described below. V2N communication has a simple configuration because it only has DL / UL communication between the base station and the terminal device. In contrast, V2V communication is considered to have various communication paths. Each scenario will be described below by mainly focusing on examples of V2V communication. However, similar communication operations can also be applied to V2P and V2I. Note that the communication destinations in V2P and V2I are pedestrians or RSU respectively.

[0146] For example, Figures 7 to 12 is a view showing examples of V2X operation scenarios. Specifically, Figure 7 shows a scenario in which vehicles communicate directly with each other without the intervention of a base station (E-UTRAN). Figure 8 shows a scenario in which vehicles communicate with each other via a base station. Figure 9 and 10 shows a scenario in which vehicles communicate with each other via a terminal device (UE, here an RSU) and a base station. Figure 11 and 12 shows a scenario in which vehicles communicate with each other via a terminal device (UE, here an RSU, or another vehicle).

[0147] In addition, in Figures 7 to 12 the "sidelink" corresponds to the communication link between terminal devices and is also called PC5. Specific examples of sidelinks include V2V, V2P, and V2I communication links. The "Uu interface" corresponds to the radio interface between the terminal device and the base station. A specific example of the Uu interface is the V2N communication link. The "PC5 interface" corresponds to the radio interface between terminal devices.

[0148] "Method for Allocating Resources to Sidelink"

[0149] This embodiment focuses on the resource allocation method for the V2V communication link in NR V2X communication. The LTE sidelink control channel (Physical Sidelink Control Channel (PSCCH)) and data channel (Physical Sidelink Shared Channel (PSSCH)) use the LTE radio frame. In some cases, NR V2X supports different types of services, such as enhanced mobile broadband (eMBB) for individual vehicles and ultra-reliable and low-latency communication (URLLC). In particular, using the LTE frame structure in URLLC communication may not be sufficient to meet the requirements of ultra-low latency. Therefore, it is considered preferable to use the parameter set and frame structure of NR. In other words, in NR V2X, it is desirable to use the parameter set and frame structure of NR for the sidelink of NR in order to meet the requirements of different services.

[0150] On the other hand, applying the parameter set or frame structure of NR to the sidelink will result in the following problems: decoding failure by the LTE V2X sensing method, or the sensing result being affected when the frame structure is different from the LTE frame structure. When traffic with different frame structures coexists, it will be impossible to use the existing method for simultaneous sensing. In addition, in the case of coexistence of LTE and NR vehicles, since NR does not have backward compatibility, vehicles using LTE communication cannot read the packets transmitted from vehicles using NR communication, which will affect the sensing results of vehicles using LTE communication.

[0151] Therefore, in this embodiment, NR V2X sensing that can support the NR parameter set and frame structure will be described.

[0152] First, an overview of the resource selection method for the sidelink in the LTE sensing result will be described.

[0153] For example, Figure 13 is a diagram showing a configuration example of resources (resource pool) allocated to sidelink communication, showing an example of the case where frequency division multiplexing (FDM) is applied. As Figure 13 shown, the resource pool is divided into a scheduling assignment (SA) area and a data area, and the PSCCH (Physical Sidelink Control Channel) and PSSCH (Physical Sidelink Shared Channel) are transmitted by each area. Hereinafter, the description will focus on the exemplary case of applying FDM as Figure 13 shown. However, the application target of the technology according to the present disclosure is not necessarily limited to this example. As a specific example, even when time division multiplexing (TDM) is applied, it is possible to apply the technology of the present disclosure described below. When TDM is applied, the SA area and the data area are orthogonal on the time axis.

[0154] The method for resource allocation to the sidelink includes the "mode 3 resource allocation" method in which the base station allocates the resources of the sidelink and the "mode 4 resource allocation" method in which the terminal device performs sensing and selects the resources of the sidelink. In the case where the terminal device selects the resources by itself, the terminal device randomly selects the resources or senses the past resource usage status and then selects the resources based on the sensing result.

[0155] · Mode 4 resource allocation

[0156] Refer to Figure 14 An overview of mode 4 resource allocation will be given. Figure 14 is an explanatory diagram showing an example of the operation timeline when the terminal device transmits a packet based on mode 4 resource allocation. As Figure 14 shown, the terminal device that transmits the packet first performs sensing to discover the resources for transmitting the packet from the resource pool. Next, the terminal device selects the resources from the resource pool based on the sensing result. Subsequently, the terminal device uses the selected resources to transmit the packet. In addition, at this time, the terminal device reserves the resources to be used for subsequent packet transmissions as needed.

[0157] In LTE V2X, as sensing, two sensing methods are supported, namely, SA decoding and energy measurement. The terminal device simultaneously performs these sensing methods and performs resource selection.

[0158] SA decoding is a sensing method for decoding the control channel transmitted from the terminal device. This makes it possible to judge whether future resources are reserved in the SA information. However, the disadvantage of this method is that the occurrence of SA signal decoding failure results in a state where the resource occupancy status of the data area cannot be grasped. Even when it is found that the terminal device is occupied by the SA signal, when the positions of the transmitting terminal device and the receiving terminal device are sufficiently far apart, the power level in the data area may actually be lower than the allowable level. Since it is impossible to measure the power level up to the data area only by SA decoding, there is a concern that the resources that can actually be used may be excluded as resources that cannot be used for transmission.

[0159] To solve the above problems, it has been agreed that LTE V2X will use energy measurement in combination with SA decoding. Energy measurement can supplement SA decoding because it can measure the actual resource usage status at the power level.

[0160] Figure 15 is an explanatory diagram showing the sensing operation in LTE V2X. Figure 15 An example of the sensing operation for selecting resources from the resource pool is shown.

[0161] Specifically, the terminal device selects resources in the resource selection window and reserves future resources based on the power measurement results in the sensing window and the resource reservation status in the sensing window. As a specific example, in Figure 15 In the example shown, when a packet to be transmitted appears, the terminal device predicts the future resource usage status based on the sensing results. For example, resources for the transmission of another packet in the future. By using the predicted results, the terminal device can select and reserve resources that can be used for transmitting the packet, that is, resources predicted not to be used for transmitting another packet.

[0162] Figure 16 FIG. is an explanatory diagram that more detailedly illustrates the sensing operation in LTE V2X. First, regarding the sensing range in the case of LTE V2X, the mode 4 terminal device continuously performs background sensing. However, for resource selection, the terminal device uses the sensing results during a subframe period before the transmission resource selection timing. Next, regarding the unit of sensing, in the case of LTE V2X, the terminal device performs sensing on each subframe on the time axis and on each of the L subchannels on the frequency axis. L is the number of subchannels required for each subframe transmission. For example, as Figure 16 As shown in the left diagram of, when two subchannels are required in one subframe (i.e., L = 2), the terminal device performs sensing in units of one subframe × 2 subchannels. In addition, as Figure 16 As shown in the right diagram of, when six subchannels are required in one subframe (i.e., L = 6), the terminal device performs sensing in units of one subframe × 6 subchannels.

[0163] Figure 17 FIG. is a flowchart illustrating an operation example of the terminal device, specifically illustrating the operation when resources are selected through sensing.

[0164] The terminal device first senses the resource pool (step S101). When a packet is generated (step S102), the terminal device sets resource candidates (set A) that meet the delay requirements (step S103). This resource candidate corresponds to Figure 15 the resource selection window in. Subsequently, the terminal device performs resource exclusion (step S104). Specifically, in the case where the terminal device skips the sensing of one subframe of m - 100*k (k = 1, 2... 10) in the sensing window, the terminal device excludes the mth resource in the resource candidates from the above resource candidates. Through this operation, for example, the Figure 15The resources indicated by "2". In addition, when the terminal device decodes the resources in the reserved resource candidates through SA and the reference signal received power (RSRP) is higher than the specified threshold (Th), the terminal device will exclude the reserved resources in the resource candidates from the above-mentioned resource candidates. Through this operation, for example, the resources indicated by "1" will be excluded. Figure 15 The resources indicated by "1".

[0165] Subsequently, the terminal device newly sets a resource candidate (set B) with the resources excluded in step S104 from the resource candidates (set A) set in step S103 (step S105). Then, the terminal device determines whether set B contains 20% or more of the resources in set A (step S106). When set B contains less than 20% of the resources in set A (step S106, no), the terminal device increases the threshold (Th) by 3 dB (step S107) and re-executes the process of step S104. When set B contains 20% or more of the resources in set A (step S106, yes), the terminal device randomly selects a resource from the resource candidates in set B (step S108) and transmits a packet.

[0166] 《4. NR Frame Structure》

[0167] Next, the frame structure of NR will be described. Figure 18 It is an explanatory diagram showing an example of the frame structure of NR. Each radio frame formed by 10 ms includes two half-frames. The time interval of the half-frame is 5 milliseconds. Each half-frame is formed by five sub-frames. The time interval of the sub-frame is 1 ms. One sub-frame is formed by one or more time slots. The time interval of one time slot depends on the parameter set (OFDM parameter set). The parameter set is defined by the combination of the subcarrier spacing (SCS) and the cyclic prefix (CP). The subcarrier spacing supported in this embodiment is defined by a power factor of 2 relative to 15 kHz. Specifically, examples of the supported subcarrier spacings include 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz. For a subcarrier spacing of 15 kHz, the time slot time interval is 1 ms, for 30 kHz it is 0.5 ms, for 60 kHz it is 0.25 ms, for 120 kHz it is 0.125 ms, and for 240 kHz it is 0.0625 ms. One time slot includes 14 symbols for normal CP and 12 symbols for extended CP. Table 1 is a table showing the subcarrier spacing settings.

[0168] Table 1

[0169]

[0170] (Table 1: Subcarrier Spacing Settings)

[0171] 《5. Resource Grid》

[0172] In this embodiment, a physical signal or a physical channel transmitted with a separate parameter set and a carrier is represented by a resource grid. Figure 19 It is an explanatory diagram of an example of the illustrated resource grid. The resource grid is defined by a plurality of resource elements. A resource element in a predetermined antenna port is represented by a subcarrier and a symbol. The index of the resource element at the predetermined antenna port can be represented by a combination of a subcarrier index and a symbol index.

[0173] In addition, in this embodiment, a resource block, which is a unit on the frequency axis, is defined. One resource block ((RB), also referred to as a physical resource block (PRB)) is formed by 12 consecutive subcarriers on the frequency axis. Examples of resource blocks include a common resource block (CRB), a physical resource block (PRB), and a virtual resource block (VRB). A common resource block is a resource block defined by a predetermined bandwidth and a predetermined parameter set. In all parameter sets, the common resource block starts at point A. The frequency specified at point A is the center of subcarrier #0 of common resource block #0 in all parameter sets. A physical resource block is a resource block defined within a predetermined bandwidth portion. Within the predetermined bandwidth portion, the physical resource block index is numbered starting from 0. A virtual resource block is a logical resource block and is used when signals from precoding processing of a physical downlink shared channel (PDSCH) or a physical uplink shared channel (PUSCH) are mapped to physical resource blocks.

[0174] 《6. Time Slot Format》

[0175] In a TDD cell (unpaired spectrum), each of the 14 symbols in a time slot can be classified into a downlink (DL, D), uplink (UL, U), or flexible (F) symbol state. A downlink symbol can be used for reception on a terminal device. An uplink symbol can be used for transmission on a terminal device. A flexible symbol can be used for transmission or reception on a terminal device. In addition, a flexible symbol can be used as a switching section (switching period) or a protection section (protection period) between the downlink and the uplink.

[0176] The states of these symbols are specified by TDD setting information (TDD-UL-DL-ConfigCommon) shared by terminal devices, TDD setting information (TDD-UL-DL-ConfigDedicated) of each terminal device, and / or a time slot format index carried by DCI.

[0177] The TDD configuration information shared by the terminal devices includes information on the number of downlink time slots and downlink symbols, the number of uplink time slots and uplink symbols, and the uplink / downlink switching period. The TDD configuration information shared by the terminal devices includes, for each symbol, information on all downlinks (all DL), all uplinks (all UL), or the number of downlink and uplink symbols. The time slot format index is a time slot format index representing a combination of 14 symbol states and is specified on a time slot basis. The format indicating the time slot format is also referred to as the Time Slot Format Indicator (SFI).

[0178] The above TDD configuration or time slot format makes it possible to flexibly switch between the uplink and the downlink on a symbol basis. Figure 20 and 21 are views showing examples of the time slot formats. In Figure 20 , the first to twelfth symbols represent downlink symbols, the thirteenth symbol represents a flexible symbol, and the fourteenth symbol represents an uplink symbol. The SFI of this time slot sequentially represents "DDDDDDDDDDDDFU" starting from the first symbol of the time slot. With this configuration, it is possible to transmit and receive PDSCH and the corresponding HARQ-ACK in the same time slot. In Figure 21 , the first symbol represents a downlink symbol, the second symbol represents a flexible symbol, and the third to fourteenth symbols represent uplink symbols. The SFI of this time slot sequentially represents "DFUUUUUUUUUUUU" starting from the symbol of the time slot. With this configuration, it is possible to transmit and receive UL grants and the corresponding PUSCH in the same time slot.

[0179] 《7. Change the unit of sensing for each of the parameter sets and frame structures》

[0180] In conventional sensing, resources have been sensed in the same unit as the resource blocks required for transmission. Specifically, as described above, sensing is performed in units of 1 subframe × L subchannels (i.e., 1 subframe × M PRBs (L is the number of subchannels required for transmission, M = L × sizeSubchannel, where sizeSubchannel is the number of PRBs included in one subchannel)).

[0181] In NR V2X, in a resource pool, terminal devices on the transmission side can perform transmission using different parameter sets. In this case, when a transmitting terminal device selects resources through existing LTE V2X sensing, the result of the energy measurement may not reflect the resource usage status.

[0182] Figure 22 is an explanatory diagram showing an example of sensing of a resource pool in which different parameter sets coexist. AsFigure 22 As shown, there are hypothetical examples where, for instance, different subcarrier spacings (such as 15 kHz and 60 kHz) coexist in one resource pool. For example, assume that there are two terminal devices, UE1 and UE2, using the resources in this resource pool for transmission and having mutually different parameter sets. In the parameter set of UE1, the subcarrier spacing is 15 kHz. When UE1 performs transmission, the minimum unit of the transmission resource is 1 millisecond × 180 kHz. In contrast, in the parameter set of UE2, the subcarrier spacing is 60 kHz. When UE2 performs transmission, the minimum unit of the transmission resource is 1 millisecond × 720 kHz.

[0183] For example, UE2, which requires 720 kHz (corresponding to LTE 4PRB) resources for transmission, performs sensing in units of 1 millisecond × 720 kHz. Here, assume that UE1 is closer to the transmitting terminal device, so the received power of each resource block is large, while UE2 is farther from the transmitting terminal device, so the received power of each resource block is small. However, since UE1 only uses 180 kHz (corresponding to LTE 1PRB) resources, in some cases, the received power of sensing block 1 will be less than that of sensing block 2.

[0184] Even when the LTE V2X sensing mechanism greatly interferes with the resources used by UE1, the transmitting terminal device may judge that the resources in sensing block 1 have weak interference and may select resources where the impact of interference is extremely high.

[0185] In view of this possibility, the terminal device changes the sensing area and performs sensing. Specifically, the terminal device performs sensing on each resource block in the smallest unit that can be transmitted. When performing sensing, the terminal device knows the size (MinSensingBlockSize) of the smallest unit of the transmission resource block used in the sensing window.

[0186] Thus, the base station can transmit the minimum unit transmission resource block size (MinSensingBlockSize) to the terminal device. The base station can regularly notify the terminal devices in the cell of the size information of the minimum unit of the transmission resource block, can notify the terminal device when the terminal device connects to the base station, or can notify the terminal device in response to a request sent by the terminal device. The base station can perform the notification of the size information of the minimum unit of the transmission resource block by using one of the physical broadcast channel (PBCH), radio resource control (RRC), system information block (SIB), PDCCH, or PDSCH.

[0187] Since the base station does not know the MinSensingBlockSize of the mode 4 terminal device in the cell, the mode 4 terminal device reports its own MinSensingBlockSize to the base station. After the terminal device selects the resources for the first transmission when performing transmission through the periodic traffic model, the terminal device reports the MinSensingBlockSize to the base station via the physical uplink control channel (PUCCH) or PUSCH. In contrast, in the case where the mode 4 terminal device performs transmission through the aperiodic traffic model, the set of parameters for transmission may be different for each transmission. In this case, the mode 4 terminal device may report the MinSensingBlockSize to the base station each time it selects resources, or may report the PRB smaller than the previously reported MinSensingBlockSize to the base station only when a smaller MinSensingBlockSize is used after selecting resources.

[0188] The terminal devices can master the MinSensingBlockSize of other terminal devices by sharing the MinSensingBlockSize information of their own devices with each other. When the mode 4 terminal device has selected resources, or when the mode 3 terminal device has received resource scheduling from the base station, it is allowed to notify the surrounding terminals of the MinSensingBlockSize. In addition, the terminal device can include the MinSensingBlockSize information in the SA or data during transmission. When notifying the MinSensingBlockSize information of its own device, the terminal device can use the PSCCH or PSSCH to perform the notification, or can share the information using the PSDCH when performing sidelink discovery.

[0189] The base station can pre-configure the MinSensingBlockSize information to the terminal device. That is, the base station can initially set the available MinSensingBlockSize to the terminal device.

[0190] A resource selection method for performing fine sensing in this way will be described. Figure 23 It is an explanatory diagram showing an example in which the terminal device selects resources in units of PRB. In Figure 23 the example, two MinSensingBlockSizes correspond to one PRB. In Figure 23 the example, as a result of sensing, it is known that some resources in PRB1 are being used, so PRB2 is selected.

[0191] Figure 24This is an explanatory diagram showing an example where a terminal device selects resources in units of the transmission resource block size, which is the smallest unit. In Figure 24 's example, two MinSensingBlockSizes correspond to one PRB. In Figure 24 's example, as a result of sensing, it is known that some resources in PRB1 and some resources in RPB2 are being used, so the unused resources in PRB1 and PRB2 are selected.

[0192] The base station can set orthogonal resource pools for different parameter sets and can notify the terminal devices in the cell of the resource pool settings. Pre-configuration of the resource pool to the terminal devices can be performed for terminal devices outside the coverage area. Different parameter sets can be configured to be orthogonal in FDM, orthogonal in TDM, or orthogonal in both FDM and TDM. Figures 25A to 25C This is an explanatory diagram showing an example of the resource pool configuration when different parameter sets coexist. Figure 25A This is an example of a resource pool where different parameter sets are orthogonal in FDM. Figure 25B This is an example of a resource pool where different parameter sets are orthogonal in TDM. Figure 25C This is an example of a resource pool where different parameter sets are orthogonal in both FDM and TDM.

[0193] In the slot format of the NR Uu link, one subframe can be used for both transmission and reception simultaneously. When applying the NR slot format to the NR sidelink, the LTE V2X sensing mechanism may not be available in some cases.

[0194] The NR Uu link supports slot formats including "DL", "UL", and "unknown". It is expected that the NR sidelink supports the slot formats configured in "SL". On the other hand, since NR meets more stringent requirements than LTE, it is possible to use the slot format of the NR Uu link in the NR sidelink for per-symbol transmission and reception. The symbols used for SL transmission and reception can be: only UL symbols (U symbols); only "unknown" symbols (X symbols); both U symbols and X symbols; or any symbol ("UL", "DL", or "unknown").

[0195] Figure 26 This is an explanatory diagram showing an example of the NR slot format of the NR sidelink. In the sensing in LTE V2X, sensing is always performed in units of subframes. As shown in Figure 26 , when only some symbols are used for transmission in the NR sidelink, as a measurement result in units of subframes, the terminal device may judge that the power level is lower than the threshold, which may affect resource selection.

[0196] In view of this possibility, the terminal device performs sensing at the symbol level. To support sensing at the symbol level, the base station notifies the terminal device of the slot format. The content notified by the base station is the content of the symbols for sidelink transmission within a subframe. This content can be notified in the form of a bitmap, or can be notified in the form of the positions of the start symbol and end symbol for sidelink transmission. The base station notifies the terminal device of the slot format through SIB, RRC, PBCH, PDCCH, PDSCH, etc. The base station can notify the slot format periodically, can notify at the timing when the terminal device connects to the cell, or can notify at the timing when the terminal device requests slot format information.

[0197] In addition, terminal devices can share the slot format of their own devices with each other. When a mode 4 terminal device has selected resources, or when a mode 3 terminal has received resource scheduling from the base station, it is allowed to notify the slot format to other surrounding terminal devices. In addition, the terminal device can include slot format information in SA or data during transmission. When notifying the slot format information of its own device, the terminal device can use PSCCH or PSSCH to perform the notification, or can share the information using PSDCH when performing sidelink discovery.

[0198] Figure 27 is an explanatory diagram showing symbol-level sensing. In Figure 27 the shown figure, T represents sidelink transmission, and R represents sidelink reception. For example, when the transmission symbols continue as shown in the upper figure of Figure 27 , the base station notifies the terminal device performing sensing of the start symbol "0" and end symbol "9" of the sidelink transmission of another terminal device. Alternatively, the terminal device shares the information of the start symbol "0" and end symbol "9" of the sidelink transmission for its own device with other terminal devices.

[0199] The base station can also notify the resources for sidelink transmission in the form of a bitmap. Alternatively, the terminal device shares the symbol information for the sidelink transmission of its own device with other terminal devices in the form of a bitmap. In the example of Figure 27 , in the case of the upper figure, the base station notifies or the terminal device shares the information [11111111110000], and in the case of the lower figure, the base station notifies or the terminal device shares the information [10111011111000].

[0200] When the NR slot format is used for sidelink, it is possible to further have the coexistence of multiple parameter sets. Therefore, a hybrid sensing method will be required. That is, the terminal device on the transmission side performs sensing in the sensing area in units of MinSensingBlockSize on the frequency axis and performs sensing at the symbol level on the time axis. Figure 28It is an explanatory diagram showing an example of hybrid sensing according to this embodiment. The terminal device on the transmission side can perform sensing in units of MinSensingBlockSize at the first, second, third, fourth, and eighth symbols in a subframe.

[0201] "8. Coexistence of LTE V2X and NR V2X"

[0202] Next, the measures to be taken when LTE V2X and NR V2X coexist will be described. When a terminal device that only supports LTE (LTE UE) and a terminal device that supports both NR and LTE (NR UE) coexist, the LTE UE that performs LTE V2X communication cannot decode the control signal (SA) of NR V2X. Therefore, in some cases, the LTE UE may select resources reserved by the NR UE.

[0203] Therefore, in this embodiment, when reserving future resources, the NR UE broadcasts the SA through the sidelink control information (SCI) of LTE. Figure 29 It is a flowchart showing an operation example of the NR UE according to this embodiment, specifically showing an operation example when the LTE UE and the NR UE coexist.

[0204] When a packet occurs in the NR UE (step S111), the NR UE selects resources for NR SA and data transmission (step S112). Then, the NR UE uses the selected resources to transmit the SA and data (step S113).

[0205] Then, the NR UE determines whether future resource reservation has been performed when selecting resources for SA and data transmission (step S114). In the case where reservation has been performed (step S114, yes), the NR UE selects resources for LTE SA (step S115) and broadcasts the LTE SA (step S116). Figure 30 It is an explanatory diagram showing an example of indicating relevant NR data in both NR SA and LTE SA. In the case where reservation has not been performed (step S114, no), the NR UE skips the processing of steps S115 and S116.

[0206] When broadcasting the LTE SA, the NR UE can at least include: time and frequency resources for the transmission and retransmission of NR data; reservation information (reserved resource information); and an indicator indicating that the transmitted data is NR data. The indicator can be an explicit indicator. For example, the NR UE can use a 1-bit indicator to indicate whether the transmitted data is NR data. Alternatively, the indicator can be an implicit indicator. For example, the NR UE can use the reserved bit of SCI format 1 to indicate whether the transmitted data is NR data.

[0207] Figure 31 It is an explanatory diagram showing a scenario where the NR UE notifies the LTE UE of the transmission resources and reservation information for NR data. As Figure 31 shown, it is expected that in the case where the NR UE is at least "out of coverage", the NR UE broadcasts the SA to the LTE UE by using the LTE SCI.

[0208] In addition, in this embodiment, the base station may notify the LTE UE within "coverage" that the NR UE within "coverage" has reserved future resources. In the case where the NR UE is in mode 3, the base station has allocated resources to the NR UE. Thus, the base station has the resource usage status and reservation information. The base station notifies the LTE UE within "coverage" of the resource usage status and reservation information. Figure 32 It is an explanatory diagram showing a scenario where the base station notifies the LTE UE of the resource usage status and reservation information of the mode 3 NR UE.

[0209] The base station notifies the LTE UE of the resource usage status and reservation information by using, for example, the PBCH or PDCCH. As the resource usage status and reservation information, the base station may at least include: the time and frequency resources for the transmission and retransmission of NR data; the reservation information (reserved resource information); and an indicator indicating that the transmitted data is NR data.

[0210] In contrast, in the case where the NR UE is in mode 4, the base station cannot grasp the resource usage status of the NR UE. Therefore, in the case where the NR UE is in mode 4, the NR UE reports the resource usage status to the base station. Figure 33 It is an explanatory diagram showing an example where the base station notifies the LTE UE of the resource usage status and reservation information of the mode 4 NR UE. The mode 4 NR UE uses the PUCCH, PUSCH, etc. to report the resource usage status and reservation information to the base station. As the resource usage status and reservation information, the mode 4 NR UE may at least include: the time and frequency resources for the transmission and retransmission of NR data; the reservation information (reserved resource information); and an indicator indicating that the transmitted data is NR data. In the case of performing the reservation of future resources and the selection of transmission resources, the mode 4 NR UE selects the transmission resources and then reports the resource usage status and reservation information to the base station. After receiving the report from the NR UE, the base station notifies the LTE UE within "coverage" of this information.

[0211] Even when the LTE UE is "within coverage", the base station may not be able to notify the LTE UE of the resource reservation information regarding the NR UE. For example, there is a hypothetical scenario where the NR UE is at the cell edge and there is an LTE UE "out of coverage" among the neighbors. Since the base station cannot notify the LTE UE "out of coverage" of the resource reservation information regarding the NR UE, the NR UE needs to notify the LTE UE of its own resource reservation information. Therefore, when there is a possibility that there is an LTE UE "out of coverage" nearby, the NR UE will broadcast the resource reservation information.

[0212] Figure 34 FIG. is a flowchart illustrating an operation example of the NR UE according to the present embodiment, specifically illustrating an operation example when the LTE UE and the NR UE coexist. Figure 34 FIG. illustrates an example of the operation when the NR UE is "within coverage".

[0213] When a packet occurs in the NR UE (step S121), the NR UE selects resources for NR SA and data transmission (step S122). Then, the NR UE uses the selected resources to transmit SA and data (step S123).

[0214] Then, the NR UE determines whether future resource reservation has been made when selecting resources for SA and data transmission (step S124). In the case where future resource reservation has been made (step S124, YES), the NR UE reports the transmission resources and reservation information to the base station (step S125).

[0215] Then, the NR UE determines whether it is necessary to broadcast the LTE SA on the sidelink (step S126). The criterion for this determination is, for example, when it is determined that the NR UE is at the cell edge. For example, the NR UE can determine whether the NR UE is at the cell edge based on the power received from the base station. Another criterion is, for example, when it is determined that the NR UE is at the cell edge and can perform transmission to an LTE UE "out of coverage". For example, the NR UE makes a determination based on its own transmission power (whether the NR UE has the transmission ability) and the traffic model (whether the NR UE can afford to perform the transmission). When it is necessary to broadcast the LTE SA on the sidelink (step S126, YES), the NR UE selects resources for the LTE SA and broadcasts the LTE SA (step S127).

[0216] In the case where future resource reservation is not performed (step S124, No), the NR UE skips the processing of steps S125 to S127. When broadcasting LTE SA is not required (step S126, No), the NR UE skips the processing of step S127.

[0217] Through these operations, the NR UE can notify the LTE UE of its own resource reservation information, and the LTE UE can select resources so as not to interfere with the NR UE.

[0218] 《9. Application Examples》

[0219] <9.1. Application Examples Related to Base Stations>

[0220] (First Application Example)

[0221] Figure 35 FIG. is a block diagram showing a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 800 has one or more antennas 810 and a base station device 820. Each of the antennas 810 and the base station device 820 can be connected to each other via an RF cable.

[0222] Each antenna 810 has a single or multiple antenna elements (for example, multiple antenna elements constituting a MIMO antenna), and is used by the base station device 820 for transmission and reception of radio signals. The eNB 800 has multiple antennas 810 as shown in Figure 35 FIG., and for example, the multiple antennas 810 can correspond to multiple frequency bands used by the eNB 800 respectively. Although Figure 35 FIG. shows an example in which the eNB 800 has multiple antennas 810, the eNB 800 can have a single antenna 810.

[0223] The base station device 820 includes a controller 821, a memory 822, a network interface 823, and a radio communication interface 825.

[0224] The controller 821 can be, for example, a CPU or a DSP, and controls the operations of various functions of the upper layer of the base station device 820. For example, the controller 821 generates data packets based on the data in the signals processed by the radio communication interface 825, and transmits the generated packets via the network interface 823. The controller 821 can generate bundled packets by bundling data from multiple baseband processors, and transmit the generated bundled packets. In addition, the controller 821 can include logical functions for performing controls such as radio resource control, radio bearer control, mobility management, admission control, or scheduling. In addition, the control can be performed in cooperation with surrounding eNBs or core network nodes. The memory 822 includes RAM and ROM, and stores programs executed by the controller 821 and various types of control data (e.g., terminal lists, transmission power data, and scheduling data).

[0225] The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. The controller 821 can communicate with core network nodes or other eNBs via the network interface 823. In that case, the eNB 800 can be connected to the core network nodes or other eNBs through logical interfaces (e.g., S1 interface or X2 interface). The network interface 823 can be a radio communication interface or a wired communication interface for radio backhaul. When the network interface 823 is a radio communication interface, the network interface 823 can use a frequency band higher than the frequency band used by the radio communication interface 825 for radio communication.

[0226] The radio communication interface 825 supports cellular communication modes such as Long Term Evolution (LTE) or LTE-Advanced, and provides a radio connection to terminals located in the cell of the eNB 800 via the antenna 810. The radio communication interface 825 generally can include a baseband (BB) processor 826, an RF circuit 827, etc. The BB processor 826 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and perform various types of signal processing in each layer (e.g., L1, Media Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP)). The BB processor 826 can include some or all of the above logical functions instead of the controller 821. The BB processor 826 can be a module including: a memory for storing communication control programs; a processor for executing the programs; and related circuits. The functions of the BB processor 826 can be modified by updating the above programs. In addition, the module can be a card or blade inserted into the card slot of the base station device 820, or can be a chip mounted on the card or blade. The RF circuit 827 can include mixers, filters, amplifiers, etc., and transmits and receives radio signals via the antenna 810.

[0227] The radio communication interface 825 may include a plurality of BB processors 826 as shown in Figure 35 , and for example, the plurality of BB processors 826 may correspond to a plurality of frequency bands used by the eNB 800 respectively. In addition, the radio communication interface 825 may include a plurality of RF circuits 827 as shown in Figure 35 , and for example, the plurality of RF circuits 827 may correspond to a plurality of antenna elements respectively. Although Figure 35 illustrates an example in which the radio communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827, the radio communication interface 825 may include a single BB processor 826 or a single RF circuit 827.

[0228] In Figure 35 the eNB 800 shown, one or more components included in the base station 100 described with reference to Figure 2 (for example, at least one of the communication control unit 151, the information acquisition unit 153, and the notification unit 155) may be implemented in the radio communication interface 825. Alternatively, at least some of these components may be implemented in the controller 821. As an example, the eNB800 is equipped with a module including a part or all of the radio communication interface 825 (for example, the BB processor 826) and / or the controller 821, and the module may be equipped with one or more of the above components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to execute the operations of one or more components) and may execute the program. As another example, a program for causing the processor to function as one or more of the above components may be installed in the eNB 800, and the radio communication interface 825 (for example, the BB processor 826) and / or the controller 821 may execute the program. As described above, the eNB 800, the base station device 820, or the above module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium on which the above program is recorded may be provided.

[0229] In addition, in Figure 35 the eNB 800 shown, the radio communication unit 120 described with reference to Figure 2 may be implemented in the radio communication interface 825 (for example, the RF circuit 827). In addition, the antenna unit 110 may be implemented in the antenna 810. In addition, the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. In addition, the storage unit 140 may be implemented in the memory 822.

[0230] (Second application example)

[0231] Figure 36 FIG. is a block diagram showing a second example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 830 has one or more antennas 840, a base station device 850, and an RRH 860. Each of the antennas 840 and the RRH 860 can be connected to each other via an RF cable. In addition, the base station device 850 and the RRH 860 can be connected to each other through a high-speed line such as an optical fiber cable.

[0232] Each antenna 840 has a single or multiple antenna elements (e.g., multiple antenna elements constituting a MIMO antenna), and is used by the RRH 860 for transmission and reception of radio signals. The eNB 830 has multiple antennas 840 as shown in Figure 36 FIG., and for example, the multiple antennas 840 can correspond to multiple frequency bands used by the eNB 830 respectively. Although Figure 36 FIG. shows an example in which the eNB 830 has multiple antennas 840, the eNB 830 can have a single antenna 840.

[0233] The base station device 850 includes a controller 851, a memory 852, a network interface 853, a radio communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are respectively similar to the controller 821, the memory 822, and the network interface 823 described with reference to Figure 35 FIG.

[0234] The radio communication interface 855 supports a cellular communication mode such as LTE or LTE-Advanced, and provides a radio connection to a terminal located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The radio communication interface 855 generally can include a BB processor 856, etc. Except for the connection to the RF circuit 864 of the RRH 860 via the connection interface 857, the BB processor 856 is similar to the BB processor 826 described with reference to Figure 35 FIG. The radio communication interface 855 includes multiple BB processors 856 as shown in Figure 36 FIG., and for example, the multiple BB processors 856 can correspond to multiple frequency bands used by the eNB 830 respectively. Although Figure 36 FIG. shows an example in which the radio communication interface 855 includes multiple BB processors 856, the radio communication interface 855 can include a single BB processor 856.

[0235] The connection interface 857 is an interface for connecting the base station device 850 (radio communication interface 855) to the RRH 860. The connection interface 857 can be a communication module for communication on a high-speed line connecting the base station device 850 (radio communication interface 855) and the RRH 860.

[0236] The RRH 860 also includes a connection interface 861 and a radio communication interface 863.

[0237] The connection interface 861 is an interface for connecting the RRH 860 (radio communication interface 863) to the base station device 850. The connection interface 861 can be a communication module for communication on a high-speed line.

[0238] The radio communication interface 863 transmits and receives radio signals via the antenna 840. The radio communication interface 863 generally may include an RF circuit 864, etc. The RF circuit 864 can include a mixer, a filter, an amplifier, etc., and transmits and receives radio signals via the antenna 840. The radio communication interface 863 includes Figure 36 as shown, a plurality of RF circuits 864, and for example, the plurality of RF circuits 864 can respectively correspond to a plurality of antenna elements. Although Figure 36 illustrates an example in which the radio communication interface 863 includes a plurality of RF circuits 864, the radio communication interface 863 can include a single RF circuit 864.

[0239] In Figure 36 the eNB 830 shown in Figure 2One or more components included in the described base station 100 (e.g., at least one of the communication control unit 151, the information acquisition unit 153, and the notification unit 155) may be implemented in the radio communication interface 855 and / or the radio communication interface 863. Alternatively, at least some of these components may be implemented in the controller 851. As an example, the eNB 830 may be equipped with a module including a part or all of the radio communication interface 855 (e.g., the BB processor 856) and / or the controller 851, and the module may be equipped with one or more of the above components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to execute the operations of one or more components) and may execute the program. As another example, a program for causing the processor to function as one or more of the above components may be installed in the eNB 830, and the radio communication interface 855 (e.g., the BB processor 856) and / or the controller 851 may execute the program. As described above, the eNB 830, the base station device 850, or the above module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium on which the above program is recorded may be provided.

[0240] In addition, in Figure 36 the eNB 830 shown, for example, referring to Figure 2 the radio communication unit 120 described may be implemented in the radio communication interface 863 (e.g., the RF circuit 864). In addition, the antenna unit 110 may be implemented in the antenna 840. In addition, the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. In addition, the storage unit 140 may be implemented in the memory 852.

[0241] <9.2. Application Examples Related to Terminal Devices>

[0242] (First Application Example)

[0243] Figure 37 is a block diagram showing an example of a schematic configuration of a smart phone 900 to which the technology according to the present disclosure can be applied. The smart phone 900 includes a processor 901, a memory 902, a storage device 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a radio communication interface 912, one or more antenna switches 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.

[0244] The processor 901 can be, for example, a CPU or a system on chip (SoC), and controls the functions of the application layer and other layers of the smart phone 900. The memory 902 includes RAM and ROM, and stores programs and data to be executed by the processor 901. The storage device 903 can include a storage medium such as a semiconductor memory or a hard disk. The external connection interface 904 is an interface for connecting external devices such as a memory card or a universal serial bus (USB) device to the smart phone 900.

[0245] The camera 906 includes an imaging element such as a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS), and generates a captured image. Examples of the sensor 907 can include a set of sensors such as a positioning sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone 908 converts the voice input to the smart phone 900 into a voice signal. The input device 909 includes a touch sensor that detects touches on the screen of the display device 910, a keypad, a keyboard, buttons, or switches, and receives input of operations or information from the user. The display device 910 has a screen such as a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display, and displays the output image of the smart phone 900. The speaker 911 converts the voice signal output from the smart phone 900 into a voice.

[0246] The radio communication interface 912 supports cellular communication modes such as LTE or LTE-Advanced, and performs radio communication. The radio communication interface 912 generally can include a BB processor 913, an RF circuit 914, etc. The BB processor 913 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for radio communication. The RF circuit 914 can include mixers, filters, amplifiers, etc., and transmits and receives radio signals via the antenna 916. The radio communication interface 912 can be a single-chip module integrating the BB processor 913 and the RF circuit 914. As Figure 37 shown, the radio communication interface 912 can include multiple BB processors 913 and multiple RF circuits 914. Although Figure 37 an example in which the radio communication interface 912 includes multiple BB processors 913 and multiple RF circuits 914 is illustrated, the radio communication interface 912 can include a single BB processor 913 or a single RF circuit 914.

[0247] In addition to the cellular communication method, the radio communication interface 912 can also support other types of radio communication methods, such as short-range radio communication methods, near-field radio communication methods, or wireless local area network (LAN) methods. In that case, the radio communication interface 912 can include a BB processor 913 and an RF circuit 914 for each radio communication method.

[0248] Each antenna switch 915 switches the connection destination of the antenna 916 among a plurality of circuits (e.g., circuits for different radio communication methods) included in the radio communication interface 912.

[0249] Each antenna 916 has a single or multiple antenna elements (e.g., multiple antenna elements constituting a MIMO antenna), and is used to transmit and receive radio signals through the radio communication interface 912. As Figure 37 shown, the smart phone 900 can have multiple antennas 916. Although Figure 37 an example in which the smart phone 900 has multiple antennas 916 is illustrated, the smart phone 900 can have a single antenna 916.

[0250] In addition, the smart phone 900 can be equipped with an antenna 916 for each radio communication method. In that case, the antenna switch 915 can be omitted from the configuration of the smart phone 900.

[0251] The bus 917 provides interconnection among the processor 901, the memory 902, the storage device 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the radio communication interface 912, and the auxiliary controller 919. The battery 918 supplies power to each block of the smart phone 900 shown in the figure via a power line partially shown by a broken line. The auxiliary controller 919 controls the operation of the minimum necessary functions of the smart phone 900, for example, during the sleep mode. Figure 37 In the smart phone 900 shown, refer to

[0252] In Figure 37 shown smart phone 900, refer to Figure 3One or more components included in the described terminal device 200 (e.g., at least one of the communication control unit 241, the information acquisition unit 243, and the notification unit 247) may be implemented in the radio communication interface 912. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, the smart phone 900 may be equipped with a module including a part (e.g., the BB processor 913) or all of the radio communication interface 912, the processor 901, and / or the auxiliary controller 919, and may be equipped with one or more of the above components in the module. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to execute the operations of one or more components) and may execute the program. As another example, a program for causing the processor to function as one or more of the above components may be installed in the smart phone 900, and the radio communication interface 912 (e.g., the BB processor 913), the processor 901, and / or the auxiliary controller 919 may execute the program. As described above, the smart phone 900 or the above module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium on which the above program is recorded may be provided.

[0253] In addition, for example, in Figure 37 the smart phone 900 shown, referring to Figure 3 the radio communication unit 220 described can be implemented in the radio communication interface 912 (e.g., the RF circuit 914). In addition, the antenna unit 210 can be implemented in the antenna 916. In addition, the storage unit 230 can be implemented in the memory 902.

[0254] (Second application example)

[0255] Figure 38 is a block diagram showing an example of a schematic configuration of a car navigator 920 to which the technology according to the present disclosure can be applied. The car navigator 920 includes a processor 921, a memory 922, a global positioning system (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, a radio communication interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

[0256] The processor 921 may be, for example, a CPU or an SoC, and controls the navigation function and other functions of the car navigator 920. The memory 922 includes a RAM and a ROM, and stores programs and data to be executed by the processor 921.

[0257] The GPS module 924 uses GPS signals received from GPS satellites to measure the position (including latitude, longitude, and altitude) of the car navigator 920. The sensor 925 can include, for example, a set of sensors such as a gyro sensor, a geomagnetic sensor, and a barometric pressure sensor. The data interface 926 is connected to the in-vehicle network 941 via a terminal (not shown), for example, and acquires data generated on the vehicle side (such as vehicle speed data).

[0258] The content player 927 plays content stored on a storage medium (such as a CD or DVD) inserted into the storage medium interface 928. The input device 929 includes a touch sensor, buttons, or switches that detect touches on the screen of the display device 930, and receives input of operations or information from the user. The display device 930 includes a screen such as an LCD or OLED display, and displays images of the navigation function or content to be played. The speaker 931 outputs sounds of the navigation function or content to be played.

[0259] The radio communication interface 933 supports cellular communication modes such as LTE or LTE-Advanced and performs radio communication. The radio communication interface 933 generally may include a BB processor 934, an RF circuit 935, etc. The BB processor 934 can perform, for example, encoding / decoding, modulation / demodulation, and multiplexing / demultiplexing, and performs various signal processing for radio communication. The RF circuit 935 can include mixers, filters, amplifiers, etc., and transmits and receives radio signals via the antenna 937. The radio communication interface 933 can be a single-chip module integrating the BB processor 934 and the RF circuit 935. The radio communication interface 933 can include multiple BB processors 934 and multiple RF circuits 935, as Figure 38 shown. Although Figure 38 an example in which the radio communication interface 933 includes multiple BB processors 934 and multiple RF circuits 935 is shown, the radio communication interface 933 can include a single BB processor 934 or a single RF circuit 935.

[0260] In addition, in addition to cellular communication modes, the radio communication interface 933 can also support other types of radio communication modes, such as short-range radio communication modes, near-field radio communication modes, or wireless LAN modes. In that case, the radio communication interface 933 can include a BB processor 934 and an RF circuit 935 for each radio communication mode.

[0261] Each antenna switch 936 switches the connection destination of the antenna 937 among multiple circuits (such as circuits for different radio communication modes) included in the radio communication interface 933.

[0262] Each antenna 937 has a single or multiple antenna elements (e.g., multiple antenna elements constituting a MIMO antenna) and is used to transmit and receive radio signals via the radio communication interface 933. The in-vehicle navigator 920 may have multiple antennas 937, as Figure 38 shown. Although Figure 38 the figure illustrates an example in which the car navigator 920 has multiple antennas 937, the car navigator 920 may have a single antenna 937.

[0263] In addition, the car navigator 920 may include an antenna 937 for each radio communication mode. In that case, the antenna switch 936 may be omitted from the configuration of the car navigator 920.

[0264] The battery 938 supplies power to each block of the car navigator 920 shown in Figure 38 the figure via a power line partially shown by a broken line in the figure. In addition, the battery 938 stores the power supplied from the vehicle side.

[0265] In Figure 38 the car navigator 920 shown, one or more components (e.g., at least one of the communication control unit 241, the information acquisition unit 243, and the notification unit 247) included in the terminal device 200 described in the reference Figure 3 description may be implemented in the radio communication interface 933. Alternatively, at least some of these components may be implemented in the processor 921. As an example, the car navigator 920 may be equipped with a module including a part (e.g., the BB processor 934) or all of the radio communication interface 933 and / or the processor 921, and the module may be equipped with one or more of the above components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to execute the operations of one or more components) and may execute the program. As another example, a program for causing the processor to function as one or more of the above components may be installed in the car navigator 920, and the radio communication interface 933 (e.g., the BB processor 934) and / or the processor 921 may execute the program. As described above, the car navigator 920 or the above module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium on which the above program is recorded may be provided.

[0266] In addition, in Figure 38 the car navigator 920 shown, for example, in the reference Figure 3The described radio communication unit 220 may be implemented in a radio communication interface 933 (e.g., RF circuit 935). In addition, the antenna unit 210 may be implemented in an antenna 937. In addition, the storage unit 230 may be implemented in a memory 922.

[0267] In addition, the technology according to the present disclosure may be implemented as a vehicle system (or vehicle) 940, which includes one or more blocks of the above-described automotive navigator 920, a vehicle network 941, and a vehicle-side module 942. The vehicle-side module 942 generates vehicle-side data such as vehicle speed, engine speed, or fault information, and outputs the generated data to the vehicle network 941.

[0268] 《10. Summary》

[0269] As described above, according to an embodiment of the present disclosure, there is provided a terminal device capable of efficiently sensing resources in NR V2X communication and a base station device that performs radio communication with the terminal device.

[0270] Although embodiments of the present disclosure have been mainly described for V2X communication, the present disclosure is not limited to such examples. Since this technology is an extension of the sidelink, it will naturally also be applicable to use cases other than V2X communication. For example, the technology shown in the embodiments of the present disclosure can be applied to D2D communication, MTC communication, mobile cells, relay communication, etc. The embodiments of the present disclosure can also be applied to multi-carrier communication in which multiple carriers are used to perform sidelink communication.

[0271] Figure 2 The base station 100 shown in can be used as an example of the control device of the present disclosure. Moreover, in Figure 2 In the configuration of the base station 100 shown, the radio communication unit 120 can be used as the communication unit of the control device of the present disclosure, and the control unit 150 can be used as the control unit of the control device of the present disclosure.

[0272] Figure 3 The terminal device 200 shown in can be used as an example of the communication device of the present disclosure. Moreover, in Figure 3 In the configuration of the terminal device 200 shown, the radio communication unit 220 can be used as the communication unit of the communication device of the present disclosure, and the control unit 240 can be used as the control unit of the communication device of the present disclosure. In addition, the terminal device 200 may also be a device provided in a moving body. The moving body may be a vehicle.

[0273] Each step in the processing performed by each device in this specification does not necessarily have to be processed in the order described in the sequence diagram or flowchart. For example, each step in the processing performed by each device can be processed in an order different from that described in the flowchart, or can be processed in parallel.

[0274] In addition, it is possible to create a computer program for causing hardware such as a CPU, a ROM, and a RAM incorporated in respective devices to exhibit the same functions as the configurations of the respective devices described above. A storage medium storing the computer program may also be provided. Further, by forming the configurations of the respective functional blocks shown in the functional block diagram by hardware, it is also possible to implement a series of processes by hardware.

[0275] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the technical scope of the present disclosure is not limited to such examples. It will be apparent to those skilled in the art of the present disclosure that various modifications and changes can be conceived within the scope of the technical concept described in the claims, and naturally fall within the technical scope of the present disclosure.

[0276] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the technical scope of the present disclosure is not limited to such examples. It will be apparent to those skilled in the art of the present disclosure that various modifications and changes can be conceived within the scope of the technical concept described in the claims, and naturally fall within the technical scope of the present disclosure.

[0277] In addition, the effects described in this specification are merely illustrative or exemplary and are not limiting. That is, in addition to or instead of the above effects, other effects apparent to those skilled in the art according to the description of this specification can also be exhibited by the technology of the present disclosure.

[0278] Note that the following configurations also fall within the technical scope of the present disclosure.

[0279] (1) A communication device, comprising:

[0280] a communication unit that performs radio communication;

[0281] a control unit that controls an operation of sensing resources to be used in a communication mode for device-to-device communication with other devices,

[0282] wherein the control unit controls to sense resources in a predetermined minimum unit on the time axis.

[0283] (2) The communication device according to (1), wherein the control unit controls to sense resources in units of symbols.

[0284] (3) The communication device according to (2), wherein the control unit controls to sense resources in units of symbols based on a time slot format received by the communication unit.

[0285] (4) The communication device according to (3), wherein the time slot format is notified from a base station.

[0286] (5) The communication device according to (4), wherein the time slot format is periodically notified from the base station.

[0287] (6) The communication device according to (4), wherein the time slot format is notified from the base station at the time point of connecting to the cell.

[0288] (7) The communication device according to (4), wherein the time slot format is notified from the base station in response to a request to the base station.

[0289] (8) The communication device according to (4), wherein the time slot format is shared with other devices.

[0290] (9) The communication device according to any one of (1) to (8), wherein the control unit further controls to sense resources in a predetermined minimum unit on the frequency axis capable of transmission.

[0291] (10) The communication device according to (9), wherein the control unit controls to perform sensing based on the information of the minimum unit.

[0292] (11) The communication device according to (10), wherein the information of the minimum unit is notified from the base station.

[0293] (12) The communication device according to (11), wherein the information of the minimum unit is periodically notified from the base station.

[0294] (13) The communication device according to (11), wherein the information of the minimum unit is notified from the base station at the time point of connecting to the cell.

[0295] (14) The communication device according to (11), wherein the information of the minimum unit is notified from the base station in response to a request to the base station.

[0296] (15) The communication device according to (11), wherein the information of the minimum unit is shared with other devices.

[0297] (16) The communication device according to any one of (1) to (15), wherein resources with different parameter sets are orthogonally arranged.

[0298] (17) The communication device according to any one of (1) to (16), wherein the control unit controls to notify the communication unit of information about the resources that have been reserved.

[0299] (18) The communication device according to (17), wherein the control unit controls to broadcast from the communication unit information about the resources that have been reserved.

[0300] (19) The communication device according to (17), wherein the control unit controls to notify a base station, which is a communication partner, of information about the resources that have been reserved.

[0301] (20) The communication device according to any one of (1) to (19), wherein the device is a device equipped in a moving body.

[0302] (21) The communication device according to (20), wherein the moving body is a vehicle.

[0303] (22) A control device, comprising:

[0304] A communication unit that performs radio communication with a terminal device;

[0305] A control unit that controls to notify, from the communication unit, information for controlling an operation of sensing resources, and the resources are used in a communication mode for performing inter-device communication between the terminal device and other devices,

[0306] wherein the control unit causes the communication unit to notify the terminal device of information for controlling to sense resources in a predetermined minimum unit on the time axis.

[0307] (23) A communication system, comprising at least two communication devices according to any one of (1) to (21).

[0308] List of reference numerals

[0309] 1 System

[0310] 100 Base station

[0311] 110 Antenna unit

[0312] 120 Radio communication unit

[0313] 130 Network communication unit

[0314] 140 Storage unit

[0315] 150 Control unit

[0316] 151 Communication control unit

[0317] 153 Information acquisition unit

[0318] 155 Notification unit

[0319] 200 Terminal device

[0320] 210 Antenna unit

[0321] 220 Radio communication unit

[0322] 230 storage units

[0323] 240 control unit

[0324] 241 communication control unit

[0325] 243 information acquisition unit

[0326] 247 notification unit

Claims

1. A communication device serving as an NR communication device, comprising: a communication unit that performs radio communication; a control unit that controls to sense resources in units of symbols on the time axis and in units of the minimum transmission resource block on the frequency axis based on a time slot format received by the communication unit, and selects first time-frequency resources for device-to-device communication with a first other device from within a resource selection window after a sensing window based on a power measurement result performed in the sensing window, and wherein the control unit controls to notify an LTE communication device from the communication unit of information about resources that have been reserved, such that the LTE communication device selects second time-frequency resources for device-to-device communication with a second other device from within the resource selection window based on the information.

2. The communication device according to claim 1, wherein the time slot format is notified from a base station.

3. The communication device according to claim 2, wherein the time slot format is notified from the base station periodically.

4. The communication device according to claim 2, wherein the time slot format is notified from the base station at a time point when connecting to a cell.

5. The communication device according to claim 2, wherein the time slot format is notified from the base station in response to a request to the base station.

6. The communication device according to claim 2, wherein the time slot format is shared with other devices.

7. The communication device according to claim 1, wherein information about the minimum unit is notified from the base station.

8. The communication device according to claim 7, wherein the information about the minimum unit is notified from the base station periodically.

9. The communication device according to claim 7, wherein the information about the minimum unit is notified from the base station at a time point when connecting to a cell.

10. The communication device according to claim 7, wherein the information about the minimum unit is notified from the base station in response to a request to the base station.

11. The communication device according to claim 7, wherein the information about the minimum unit is shared with other devices.

12. The communication device according to claim 1, wherein resources with different parameter sets are orthogonally arranged.

13. The communication device according to claim 1, wherein the control unit controls to broadcast information about resources that have been reserved from the communication unit.

14. The communication device according to claim 1, wherein the control unit controls to notify a base station serving as a communication partner of information about resources that have been reserved.

15. The communication device according to claim 1, wherein the device is a device equipped in a moving body.

16. The communication device according to claim 15, wherein the moving body is a vehicle.

17. A control device, comprising: a communication unit that performs radio communication with an NR terminal device and an LTE terminal device; A control unit that controls to notify, from a communication unit, information for controlling operations of sensing and selecting resources, and uses the resources in a communication mode for performing device - to - device communication between the NR terminal device and a first other device and for performing device - to - device communication between the LTE terminal device and a second other device. The communication unit sends a time slot format to the NR terminal device, such that the NR terminal device senses resources based on the time slot format in units of symbols on the time axis and in units of the minimum unit of transmission resource blocks on the frequency axis, and selects, from within a resource selection window after a sensing window, a first time - frequency resource for device - to - device communication with the first other device based on a power measurement result performed in the sensing window. The communication unit sends information on resources that have been reserved to the LTE terminal device, such that the LTE communication device selects, from within the resource selection window, a second time - frequency resource for device - to - device communication with the second other device based on the information.

18. A communication system comprising at least two communication devices according to claim 1.

Images