Terminal device, base station, and communication system

Abstract

A terminal device capable of communicating with a first terminal device capable of performing communication based on a first sidelink communication scheme. The terminal device includes: an acquisition unit that acquires first control information on a signal transmitted based on a first sidelink communication scheme; and a notification unit that notifies a second terminal device of second control information on the first control information. The second terminal device performs communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

Description

Technical Field

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

[0002] In recent years, sidelink communication has attracted attention. For example, device-to-device (D2D) communication for performing direct communication between terminal devices has attracted attention as a form of sidelink communication.

[0003] Citation List

[0004] Non-Patent Literature

[0005] Non-Patent Literature 1: TS22.186 V16.2.0, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Enhancement of 3GPP support for V2X scenarios; Stage 1 (Release 16) Summary of the Invention

[0006] Technical Problem

[0007] The demand for sidelink communication is increasing. To meet this requirement, it is assumed that in the future, there will be multiple communication schemes for sidelink communication as needed. When multiple communication schemes are mixed in an environment, it is possible that the adjustment between terminal devices with different communication schemes is unsuccessful, and sidelink communication with high communication performance (for example, stable communication quality, high communication quality, low latency, high reliability, or high throughput) cannot be achieved.

[0008] Therefore, the present disclosure proposes a terminal device, a base station, and a communication system capable of achieving sidelink communication with high communication performance.

[0009] Note that the above problems or objectives are only one of the multiple problems or objectives that can be solved or achieved by the multiple embodiments disclosed in this specification.

[0010] Solution to the Problem

[0011] To solve the above problems, a terminal device according to an embodiment of the present disclosure can communicate with a first terminal device capable of communicating based on a first sidelink communication scheme. The terminal device includes: an acquisition unit that acquires first control information about a signal transmitted based on the first sidelink communication scheme; and a notification unit that notifies a second terminal device of second control information about the first control information, where the second terminal device communicates based on a second sidelink communication scheme different from the first sidelink communication scheme. Description of the Drawings

[0012] Figure 1 is a diagram showing an example of a conventional sidelink frame configuration.

[0013] Figure 2 is a diagram showing an example of a conventional sidelink frame configuration.

[0014] Figure 3 is a diagram showing an example of a sidelink frame configuration assumed to be adopted in the future.

[0015] Figure 4 is a diagram showing a configuration example of a communication system according to an embodiment of the present disclosure.

[0016] Figure 5 is a diagram showing a configuration example of a management device according to an embodiment of the present disclosure.

[0017] Figure 6 is a diagram showing a configuration example of a base station according to an embodiment of the present disclosure.

[0018] Figure 7 is a diagram showing a configuration example of a terminal device according to an embodiment of the present disclosure.

[0019] Figure 8 is a diagram showing a configuration example of a terminal device according to an embodiment of the present disclosure.

[0020] Figure 9 is a diagram showing an overview of sidelink communication.

[0021] Figure 10 is a diagram showing a sidelink resource pool.

[0022] Figure 11 is a diagram showing resource allocation pattern 2(d).

[0023] Figure 12 is a diagram showing an example of a communication environment assumed in this embodiment.

[0024] Figure 13 is a sequence diagram when the transmitting station of the URLLC terminal transmits second control information.

[0025] Figure 14 It is a sequence diagram when the transmitting station of a representative URLLC terminal sends the second control information.

[0026] Figure 15 It is a sequence diagram when the receiving station of a URLLC terminal sends the second control information.

[0027] Figure 16 It is a sequence diagram when the base station sends the second control information.

[0028] Figure 17 It is a sequence diagram when a non-URLLC terminal capable of receiving the control information of a URLLC terminal sends the second control information.

[0029] Figure 18 It is a diagram showing a state where the second control information is arranged at a position different from that of the conventional control signal.

[0030] Figure 19 It is a diagram showing a state where the second control information is arranged at the position of the conventional control signal. Detailed implementation

[0031] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same reference numerals are assigned to the same parts, and repeated descriptions are omitted.

[0032] In addition, in this specification and the drawings, a plurality of components having substantially the same functional configuration may be distinguished by adding different numbers after the same reference numeral. For example, as needed, a plurality of configurations having substantially the same functional configuration are distinguished as terminal devices 401, 402, and 403. However, when it is not particularly necessary to distinguish each of a plurality of components having substantially the same functional configuration, only the same reference numeral is given. For example, when it is not necessary to particularly distinguish the terminal devices 401, 402, and 403, they are simply referred to as the terminal device 40.

[0033] In the following description, one or more embodiments (including examples and modifications) can be implemented independently. On the other hand, at least some of the following-described embodiments can be appropriately combined with at least some of the other embodiments. The plurality of embodiments can include novel features different from each other. Therefore, the plurality of embodiments can contribute to solving different purposes or problems and can present different effects.

[0034] The present disclosure will be described in the following item order.

[0035] 1. Overview

[0036] 2. System configuration

[0037] 2-1. Configuration example of the communication system

[0038] 2-2. Configuration Example of Management Device

[0039] 2-3. Configuration Example of Base Station

[0040] 2-4. Configuration of First Terminal Device

[0041] 2-5. Configuration of Second Terminal Device

[0042] 3. Sidelink Communication

[0043] 3-1. Overview of Sidelink Communication

[0044] 3-2. Details of Sidelink Communication

[0045] 3-3. Sidelink Resource Pool

[0046] 3-4. Sidelink Resource Allocation Method

[0047] 3-5. Sensing in Sidelink Communication

[0048] 3-6. Sidelink Communication of This Embodiment

[0049] 4. Operation of Communication System

[0050] 4-1. Overview of Operation of Communication System

[0051] 4-2. First Form

[0052] 4-3. Second Form

[0053] 4-4. Third Form

[0054] 4-5. Fourth Form

[0055] 4-6. Fifth Form

[0056] 4-7. Transmission of Second Control Information

[0057] 4-8. Summary of Control Information Transmission

[0058] 5. Modification

[0059] 6. Conclusion

[0060] <<1. Overview>>

[0061] In recent years, sidelink communication has attracted attention. In 3GPP (registered trademark), device-to-device (D2D) communication for direct communication between terminal devices is standardized as sidelink communication.

[0062] In sidelink communication, vehicle-to-everything (V2X) communication is one of the main use cases. As V2X communication, vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), and vehicle-to-network (V2N) are assumed. In particular, platooning, advanced driving, extended sensors, and remote driving have been studied as specific use cases of V2X communication in 5G NR. To achieve the above, V2X communication requires ultra-reliable and low-latency communication (URLLC). For URLLC, standards have been developed to achieve a latency of 10 milliseconds or less and a reliability of 99.999%.

[0063] So far, vehicle-to-vehicle communication has been considered V2X communication. However, in the future, in-vehicle communication can also be extended as a technology for sidelink communication. Here, considering autonomous driving, the control device basically controls the vehicle based on data from sensors or cameras in the vehicle. Therefore, the control device uses information obtained through vehicle-to-vehicle communication (i.e., traditional V2X communication) as auxiliary information. Therefore, in-vehicle communication is required to have a lower latency and higher reliability than vehicle-to-vehicle communication.

[0064] In addition, sidelink communication can be used not only for V2X communication but also for various use cases. For example, factory automation is one of the use cases where sidelink communication can be utilized. In the factory, a large number of devices such as sensors and cameras are installed for direct communication with each other. In particular, when the production line is frequently changed according to the product to be manufactured, the demand for URLLC for sidelink communication is high.

[0065] With the increasing demand for sidelink communication, in future sidelink communication, it is assumed that there will be multiple communication schemes according to the demand. For example, in order to support URLLC in the future, it is assumed that there will be a sidelink communication scheme using a frame configuration different from the traditional frame configuration.

[0066] Figure 1 and 2 are diagrams each showing an example of a conventional sidelink frame configuration. Figure 1 Shows the sidelink frame configuration when the physical sidelink control channel (PSCCH) has a two-symbol configuration, the demodulation reference signal (DMRS) has a two-symbol allocation, and there is no physical sidelink feedback channel (PSFCH). In addition, Figure 2 Shows the sidelink frame configuration when the PSCCH has a three-symbol configuration, the DMRS has a three-symbol allocation, and there is a PSFCH. Currently, in the sidelink communication defined in 3GPP, based on Figure 1 and Figure 2Control is performed according to the frame configuration shown. The frame has a configuration in which time slots are the smallest unit. Here, when the subcarrier spacing is 15 kHz, the time length of one time slot is one millisecond. As described above, traditional sidelink communication mainly assumes the usage scenario of V2X, and its requirement for latency is 10 milliseconds. Therefore, there is no problem even when one time slot is the smallest unit, but in the future, it will be impossible to support usage scenarios that require ultra-low latency of less than 1 millisecond.

[0067] Therefore, in future sidelink communication, an operation that assumes starting signal transmission without depending on the time slot boundary is introduced as a method to adapt to URLLC services. Figure 3 is a diagram showing an example of a sidelink frame configuration assumed to be adopted in the future. Figure 3 The non-URLLC signals in are traditional signals that conform to the time slot boundary, while Figure 3 the URLLC signals in are signals that are assumed not to depend on the time slot boundary in the future. In such a frame configuration assumed in the future, the terminal device transmits a signal with a specific OFDM symbol length from the OFDM symbol position that does not depend on the time slot boundary ( Figure 3 the URLLC signal shown in). At this time, the length of the symbol length is set to not exceed the length of the time slot boundary, and the signal does not cross the time slot boundary.

[0068] As described above, in sidelink communication, according to future requirements, it is assumed that there will be multiple communication schemes. When multiple sidelink communication schemes are mixed in one environment, the adjustment between terminal devices with different communication schemes may not succeed, and it may not be possible to achieve sidelink communication with high communication performance (for example, stable communication quality, high communication quality, low latency, high reliability, or high throughput).

[0069] This will be described more specifically.

[0070] This embodiment assumes an environment in which sidelink terminals (hereinafter referred to as URLLC terminals) that transmit services that require low latency and high reliability (hereinafter referred to as URLLC services) and sidelink terminals (hereinafter referred to as non-URLLC terminals) that transmit services that do not require low latency and high reliability are mixed.

[0071] Here, a URLLC terminal is a terminal device capable of performing communication based on a sidelink communication scheme that allows signals from multiple terminal devices to exist in one radio resource of one time slot. Here, "signals from multiple terminal devices exist in one radio resource of one time slot" means that signals transmitted by multiple terminal devices exist within the radio resource unit for transmitting signals. Here, one radio resource can be, for example, a resource block. Note that this one radio resource does not include other resources for user multiplexing. For example, this one radio resource does not include resources of different frequency bands frequency-division multiplexed in the same time slot. This also applies to spatial resources for spatial multiplexing and non-orthogonal resources for non-orthogonal multiplexing.

[0072] In addition, a non-URLLC terminal is a terminal device capable of performing communication based on a sidelink communication scheme in which a signal from one terminal device exists in one radio resource of one time slot. Here, "a signal from one terminal device exists in one radio resource of one time slot" means that a signal transmitted by one terminal device exists within the radio resource unit for transmitting data signals. Here, one radio resource can be, for example, a resource block. Note that this one radio resource does not include other resources for user multiplexing. For example, this one radio resource does not include resources of different frequency bands frequency-division multiplexed in the same time slot. This also applies to spatial resources for spatial multiplexing and non-orthogonal resources for non-orthogonal multiplexing.

[0073] Note that in this embodiment, when transmission is performed by time-division multiplexing, a time slot is a fixed time interval. Multiple time slots can be configured with a larger time interval or a smaller time interval. For example, multiple time slots can be configured as subframes. In addition, multiple subframes can form a radio frame. Similarly, multiple sub-time slots can be configured as a time slot.

[0074] As described above, in future sidelink communication, an operation of starting signal transmission without relying on time slot boundaries is introduced as a method to adapt to URLLC services. When this operation is introduced, it is assumed that URLLC terminals also transmit control information including scheduling information at a timing independent of time slot boundaries. On the other hand, non-URLLC terminals transmit signals at a timing that conforms to time slot boundaries. Therefore, non-URLLC terminals transmit control information related to signal transmission at a predetermined position (PSCCH) indicated in the frame configuration.

[0075] URLLC terminals and non-URLLC terminals monitor the locations where PSCCH is transmitted and obtain control information of another terminal device. At this time, since non-URLLC terminals only obtain control information transmitted at predetermined positions in a time slot, non-URLLC terminals cannot obtain the control information of URLLC terminals that transmit control information independent of time slots. In this case, sidelink communication cannot be properly adjusted between URLLC terminals and non-URLLC terminals.

[0076] Therefore, in this embodiment, the above problems are solved by the following method.

[0077] The communication system of this exemplary embodiment includes a first terminal device (e.g., a URLLC terminal) capable of performing communication based on a first sidelink communication scheme, and a second terminal device (e.g., a non-URLLC terminal) capable of performing communication based on a second sidelink communication scheme different from the first sidelink communication scheme. Here, the first sidelink communication scheme is, for example, a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource of a time slot. Additionally, the second sidelink communication scheme is, for example, a sidelink communication scheme in which a signal from one terminal device exists in one radio resource of a time slot.

[0078] The first terminal device (e.g., a URLLC terminal) obtains first control information regarding a signal transmitted based on the first sidelink communication scheme. For example, the first terminal device may obtain first control information transmitted by another first terminal device, or may obtain first control information scheduled to be transmitted (or transmitted) by the first terminal device from its own storage unit. Then, the first terminal device notifies the second terminal device (e.g., a non-URLLC terminal) of second control information regarding the first control information. At this time, the first terminal device may notify the second control information through a channel that can be received by the second terminal device based on the second sidelink communication scheme. The content of the second control information may be the content of the first control information itself, or may be obtained by integrating multiple pieces of first control information collected from multiple first terminal devices into one piece of information.

[0079] Therefore, the second terminal device (e.g., a non-URLLC terminal) can identify the control information of the first terminal device (e.g., a URLLC terminal) in order to successfully perform adjustment of sidelink communication (e.g., adjustment of the use of radio resources) between the first terminal device and the second terminal device. Thus, the communication system can achieve sidelink communication with high communication performance.

[0080] The overview of this embodiment has been described above, and the communication system according to this embodiment will be described in detail below.

[0081] <<2. System Configuration>>

[0082] First, the configuration of the communication system 1 will be specifically described with reference to the accompanying drawings.

[0083] <2-1. Configuration Example of Communication System>

[0084] Figure 4 FIG. is a diagram showing a configuration example of the communication system 1 according to an embodiment of the present disclosure. The communication system 1 includes a management device 10, a base station 20, a terminal device 30, and a terminal device 40. Here, the terminal device 30 is a first terminal device (e.g., a URLLC terminal) capable of performing communication based on a first sidelink communication scheme. In addition, the terminal device 40 is a second terminal device (e.g., a non-URLLC terminal) that performs communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

[0085] Here, the first sidelink communication scheme is, for example, a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource of one time slot. Additionally, the second sidelink communication scheme is, for example, a sidelink communication scheme in which a signal from one terminal device exists in one radio resource of one time slot. However, the first sidelink communication scheme and the second sidelink communication scheme are not limited to this example. Any sidelink communication scheme can be adopted as the first sidelink communication scheme and the second sidelink communication scheme as long as they are different sidelink communication schemes.

[0086] The communication system 1 provides a wireless network capable of performing mobile communication to users through the coordinated operation of the wireless communication devices constituting the communication system 1. The wireless network of the present embodiment includes, for example, a radio access network and a core network. Additionally, in the present embodiment, the wireless communication device is a device having a wireless communication function, corresponding to Figure 4 the base station 20, the terminal device 30, and the terminal device 40 in the example of. In the following description, the wireless communication device may be simply referred to as a communication device.

[0087] The communication system 1 may include multiple management devices 10, multiple base stations 20, multiple terminal devices 30, and multiple terminal devices 40. In Figure 1 the example of, the communication system 1 includes management devices 101 and 102 as the management device 10, and includes base stations 201, 202, 203, etc. as the base station 20. In addition, the communication system 1 includes terminal devices 301, 302, 303, etc. as the terminal device 30, and includes terminal devices 401, 402, 403, etc. as the terminal device 40.

[0088] Note that the devices in the drawings can be considered as devices in a logical sense. In other words, a part of the devices in the drawings can be implemented by virtual machines (VMs), containers, adapters, etc., and they can be implemented on physically identical hardware.

[0089] Note that the terminal device 30 may support radio access technologies (RATs), such as Long Term Evolution (LTE), New Radio (NR), Wi-Fi (registered trademark), or Bluetooth (registered trademark). In this case, the terminal device 30 can be configured to be capable of using different radio access technologies (wireless communication systems). For example, the terminal device 30 can be configured to be capable of using NR and Wi-Fi.

[0090] In addition, the terminal device 30 can be configured to be capable of using different cellular communication technologies (such as LTE and NR). LTE and NR are types of cellular communication technologies, and mobile communication of the terminal device is enabled by arranging a plurality of cellular areas covered by a base station. Note that the radio access method used by the communication system 1 is not limited to LTE and NR, and can be another radio access method such as Wideband Code Division Multiple Access (W-CDMA) or Code Division Multiple Access 2000 (CDMA2000).

[0091] Note that in the following description, "LTE" includes LTE-Advanced (LTE-A), LTE-A Pro, and Evolved Universal Terrestrial Radio Access (EUTRA). In addition, NR includes New Radio Access Technology (NRAT) and Further EUTRA (FEUTRA). Note that a single base station can manage multiple cells. In the following description, the cell corresponding to LTE is called an LTE cell, and the cell corresponding to NR is called an NR cell.

[0092] NR is the next-generation (fifth-generation) radio access technology of LTE (fourth-generation communication including LTE-Advanced and LTE-A Pro). NR is a radio access technology that can support various use cases, including enhanced mobile broadband (eMBB), massive machine type communication (mMTC), and ultra-reliable and low-latency communication (URLLC). NR is studied for a technical framework corresponding to usage scenarios, requirements, deployment scenarios, etc. in these use cases.

[0093] Note that the terminal device 30 can connect to the network using radio access technologies (wireless communication systems) other than LTE, NR, Wi-Fi, and Bluetooth. For example, the terminal device 30 can connect to the network by using low-power wide-area (LPWA) communication. In addition, the terminal device 30 can connect to the network using a unique standard wireless communication.

[0094] Here, LPWA communication is a wireless communication capable of implementing low-power wide-area communication. For example, LPWA radio is an Internet of Things (IoT) wireless communication using a specified low-power radio (e.g., 920 MHz band) or an Industrial, Scientific, and Medical (ISM) band. Note that the LPWA communication used by the terminal device 30 may conform to an LPWA standard. Examples of LPWA standards include ELTRES, ZETA, SIGFOX, LoRaWAN, and NB-Iot. Obviously, the LPWA standard is not limited to this and can be other LPWA standards.

[0095] Note that one or more communication paths may include a virtual network. For example, the multiple communication paths to which the terminal device 30 can connect may include a virtual network such as a Virtual Local Area Network (VLAN) and a physical network such as an IP communication path. In this case, the terminal device 30 may perform routing control based on a routing control protocol such as Open Shortest Path First (OSPF) or Border Gateway Protocol (BGP).

[0096] In addition, the multiple communication paths may include one or more overlay networks or one or more network slices.

[0097] The base station or relay station constituting the communication system 1 may be a ground station or a non-ground station. The non-ground station may be a satellite station or an aircraft station. When the non-ground station is a satellite station, the communication system 1 may be a bent pipe (transparent) type mobile satellite communication system.

[0098] In this embodiment, a ground station (also referred to as a ground base station) refers to a base station (including a relay station) installed on the ground. Here, "ground" is the ground in a broad sense that includes not only land but also underground, above water, and underwater. Note that in the following description, "ground station" may be replaced by "gateway".

[0099] Note that an LTE base station may be referred to as an evolved Node B (eNodeB) or eNB. In addition, an NR base station may be referred to as a gNodeB or gNB. In LTE and NR, a terminal device (also referred to as a mobile station or terminal) may be called a User Equipment (UE). Note that a terminal device is a communication device and is also referred to as a mobile station or terminal.

[0100] In this embodiment, the concept of a communication device includes not only portable mobile devices (terminal devices) such as mobile terminals but also devices installed in a structure or a moving body. The structure or the moving body itself may be considered a communication device. In addition, the concept of a communication device includes base stations and relay stations in addition to terminal devices. A communication device is a type of processor and information processor. In addition, a communication device may be paraphrased as a transmitting device or a receiving device.

[0101] Hereinafter, the configurations of each device constituting the communication system 1 will be specifically described. Note that the configurations of each device described below are merely examples. The configuration of each device may be different from the following configurations.

[0102] <2-2. Configuration of the management device>

[0103] Next, a configuration example of the management device 10 will be described.

[0104] The management device 10 is an information processor (computer) that manages a wireless network. For example, the management device 10 is an information processor that manages the communication of the base station 20. The management device 10 may be, for example, a device having the function of a mobility management entity (MME). The management device 10 may be a device having the function of an access and mobility management function (AMF) and / or a session management function (SMF). Of course, the functions of the management device 10 are not limited to MME, AMF, and SMF. The management device 10 may be a device having the function of a network slice selection function (NSSF), an authentication server function (AUSF), a policy control function (PCF), or a unified data management (UDM). In addition, the management device 10 may be a device having the function of a home subscriber server (HSS).

[0105] Note that the management device 10 may have the function of a gateway. For example, the management device 10 may have the function of a serving gateway (S-GW) or a packet data network gateway (P-GW). In addition, the management device 10 may have the function of a user plane function (UPF). In this case, the management device 10 may have multiple UPFs. In addition, the management device 10 may have the function of a local service control function (LSCF). LSCF is a control function newly added in this embodiment for providing local services.

[0106] The core network includes multiple network functions, and each network function may be aggregated into one physical device or distributed to multiple physical devices. In other words, the management device 10 may be dispersedly arranged in multiple devices. In addition, the distributed arrangement can be controlled to be dynamically executed. The base station 20 and the management device 10 constitute a network and provide a wireless communication service to the terminal device 30. The management device 10 is connected to the Internet, and the terminal device 30 can use various services provided via the Internet through the base station 20.

[0107] Note that the management device 10 does not have to be a device that configures the core network. For example, assume that the core network is a wideband code division multiple access (W-CDMA) or code division multiple access 2000 (CDMA2000) core network. In this case, the management device 10 may be a device used as a radio network controller (RNC).

[0108] Figure 5 This is a diagram showing a configuration example of the management device 10 according to an embodiment of the present disclosure. The management device 10 includes a communication unit 11, a storage unit 12, and a control unit 13. Note that Figure 5 the configuration shown in

[0109] is a functional configuration, and the hardware configuration may be different from the functional configuration. In addition, the functions of the management device 10 may be implemented in a statistically or dynamically distributed manner in a plurality of physically separated structures. For example, the management device 10 may include a plurality of server devices.

[0110] The communication unit 11 is a communication interface for communicating with other devices. The communication unit 11 may be a network interface or a device connection interface. For example, the communication unit 11 may be a local area network (LAN) interface, such as a network interface card (NIC), or may be a universal serial bus (USB) interface including a USB host controller and a USB port. In addition, the communication unit 11 may be a wired interface or a wireless interface. The communication unit 11 functions as a communication device of the management device 10. The communication unit 11 communicates with the base station 20, etc. under the control of the control unit 13.

[0111] The control unit 13 is a controller that controls each part of the management device 10. The control unit 13 is implemented by a processor such as a CPU (Central Processing Unit), MPU (Micro Processing Unit), GPU (Graphics Processing Unit), etc. For example, the control unit 13 is implemented by a processor that uses a random access memory (RAM), etc. as a working area to execute various programs stored in a storage device inside the management device 10. Note that the control unit 13 may be implemented by an integrated circuit such as an application specific integrated circuit (ASIC) or a field programmable gate array (FPGA). Any one of the CPU, MPU, GPU, ASIC, and FPGA may be regarded as a controller.

[0112] <2-3. Configuration Example of Base Station>

[0113] Next, a configuration example of the base station 20 will be described. The base station 20 may be paraphrased as BS 20.

[0114] The base station 20 is a wireless communication device that wirelessly communicates with the terminal device 30. The base station 20 can be configured to wirelessly communicate with the terminal device 30 via a relay station, or can be configured to directly wirelessly communicate with the terminal device 30.

[0115] The base station 20 is a type of communication device. The base station 20 is, for example, a device corresponding to a radio base station (e.g., a base station, Node B, eNB, and gNB) or a radio access point. The base station 20 can be a wireless relay station. In addition, the base station 20 can be an optical extension device called a remote radio head (RRH) or a radio unit (RU). In addition, the base station 20 can be a receiving station such as a field pickup unit (FPU). In addition, the base station 20 can be an integrated access and backhaul (IAB) donor node or an IAB relay node that provides a radio access line and a radio backhaul line through time-division multiplexing, frequency-division multiplexing, or space-division multiplexing.

[0116] Note that the radio access technology used by the base station 20 can be a cellular communication technology or a wireless LAN technology. Obviously, the radio access technology used by the base station 20 is not limited to this, but can be other radio access technologies. For example, the radio access technology used by the base station 20 can be a low-power wide-area (LPWA) communication technology. In addition, the wireless communication used by the base station 20 can be wireless communication using millimeter waves. In addition, the wireless communication used by the base station 20 can be wireless communication using radio waves or wireless communication using infrared rays or visible light (light). The base station 20 is capable of non-orthogonal multiple access (NOMA) communication with the terminal device 30. Here, NOMA communication is communication (transmission, reception, or both) using non-orthogonal resources. Note that the base station 20 is capable of performing NOMA communication with another base station 20.

[0117] Note that the base stations 20 are capable of communicating with each other via a base station-core network interface (e.g., the NG interface and the S1 interface). This interface can be wired or wireless. In addition, the base stations can be capable of communicating with each other via an inter-base station interface (e.g., the Xn interface, the X2 interface, the S1 interface, and the F1 interface). This interface can be wired or wireless.

[0118] Note that the concept of a base station includes not only a donor base station but also a relay base station (also called a relay station). For example, the relay base station can be any one of an RF repeater, an intelligent repeater, and an intelligent surface. In addition, the concept of a base station includes not only a structure having the function of a base station but also the devices installed in the structure.

[0119] For example, the structure is a building such as a high-rise building, a house, a steel tower, a station facility, an airport facility, a port facility, an office building, a school building, a hospital, a factory, a commercial facility, or a stadium. Note that the concept of a structure includes not only buildings but also non-building structures such as tunnels, bridges, dams, walls, or iron pillars, and equipment such as cranes, gates, or windmills. Additionally, the concept of a structure includes not only land (narrowly on the ground) or underground structures but also water structures such as platforms or large floating bodies, and underwater structures such as ocean observation facilities. The base station can be paraphrased as an information processor.

[0120] The base station 20 can be a donor station or a relay station. Additionally, the base station 20 can be a fixed station or a mobile station. A mobile station is a wireless communication device (e.g., a base station) configured to be movable. In this case, the base station 20 can be a device installed in a moving body or can be the moving body itself. For example, a relay station with mobility can be considered as the base station 20 as a mobile station. Additionally, devices such as vehicles, unmanned aerial vehicles (UAVs) represented by drones, or smartphones, which are originally devices with mobility and having the function of a base station (at least a part of the function of a base station), also correspond to the base station 20 as a mobile station.

[0121] Here, the moving body can be a mobile terminal such as a smartphone or a mobile phone. Additionally, the moving body can be a moving body traveling on land (narrowly the ground) (e.g., vehicles including cars, bicycles, buses, trucks, motorcycles, trains, and linear motor vehicles) or a moving body traveling underground (e.g., in a tunnel) (e.g., a subway). Additionally, the moving body can be a moving body traveling on water (e.g., a ship such as a passenger ship, a cargo ship, or an air-cushion ship) or a moving body moving underwater (e.g., a submarine such as a diving ship, a submarine, and an unmanned submarine). Note that the moving body can be a moving body moving in the atmosphere (e.g., an aircraft such as an airplane, a spacecraft, or a drone).

[0122] Additionally, the base station 20 can be a ground base station device (ground station) installed on the ground. For example, the base station 20 can be a base station installed in a structure on the ground or can be a base station installed in a moving body moving on the ground. More specifically, the base station 20 can be an antenna installed in a structure such as a building and signal processing equipment connected to the antenna. Obviously, the base station 20 can be the structure or the moving body itself. "Ground" in a broad sense includes not only land (narrowly the ground) but also underground, water, and underwater. Note that the base station 20 is not limited to a ground base station. For example, when the communication system 1 is a satellite communication system, the base station 20 can be an aircraft station. From the perspective of a satellite station, an aircraft station located on the earth is a ground station.

[0123] Note that the base station 20 is not limited to a ground station. The base station 20 can be a non-ground base station (non-ground station) capable of floating in the air or in space. For example, the base station 20 can be an aircraft station or a satellite station.

[0124] A satellite station is a satellite station capable of floating outside the atmosphere. A satellite station can be a device installed on a space moving body such as an artificial satellite, or can be the space moving body itself. A space moving body is a moving body that moves outside the atmosphere. As a space moving body, for example, artificial bodies such as artificial satellites, spacecraft, space stations, and probes can be cited. The satellite used as a satellite station can be any one of a low Earth orbit (LEO) satellite, a medium Earth orbit (MEO) satellite, a geostationary Earth orbit (GEO) satellite, and a highly elliptical orbit (HEO) satellite. Obviously, the satellite station can be a device installed on an LEO satellite, an MEO satellite, a GEO satellite, or an HEO satellite.

[0125] An aircraft station is a wireless communication device capable of floating in the atmosphere, such as an aircraft. An aircraft station can be a device installed on an aircraft or the like, or can be the aircraft itself. Note that the concept of an aircraft not only includes heavy aircraft such as airplanes and gliders, but also includes light aircraft such as balloons and airships. In addition, the concept of an aircraft not only includes heavy and light aircraft, but also includes rotary-wing aircraft such as helicopters and autogyros. Note that the aircraft station (or the aircraft on which the aircraft station is installed) can be an unmanned aircraft such as a drone.

[0126] Note that the concept of an unmanned aircraft also includes an unmanned aircraft system (UAS) and a tethered UAS. The concept of an unmanned aircraft also includes a lighter-than-air (LTA) UAS and a heavier-than-air (HTA) UAS. In addition, the concept of an unmanned aircraft also includes a high-altitude UAS platform (HAP).

[0127] The coverage area of the base station 20 can be large, such as a macro cell, to small, such as a pico cell. Obviously, the size of the coverage area of the base station 20 can be extremely small, such as a femto cell. In addition, the base station 20 can have beamforming capabilities. In this case, the base station 20 can form a cell or a service area for each beam.

[0128] Figure 6 is a diagram showing a configuration example of the base station 20 according to an embodiment of the present disclosure. The base station 20 includes a wireless communication unit 21, a storage unit 22, and a control unit 23. Note that Figure 6 the configuration shown in is a functional configuration, and the hardware configuration can be different from the functional configuration. In addition, the functions of the base station 20 can be implemented in a distributed manner in a plurality of physically separated configurations.

[0129] The wireless communication unit 21 is a signal processing unit for performing wireless communication with other wireless communication devices (e.g., the terminal device 30, the terminal device 40, and another base station 20). The wireless communication unit 21 operates under the control of the control unit 23.

[0130] The wireless communication unit 21 corresponds to one or more radio access methods. For example, the wireless communication unit 21 supports both NR and LTE. In addition to NR or LTE, the wireless communication unit 21 may be compatible with W-CDMA or CDMA2000. Furthermore, the wireless communication unit 21 may support an automatic retransmission technique such as hybrid automatic repeat request (HARQ).

[0131] The wireless communication unit 21 includes a transmission processing unit 211, a reception processing unit 212, and an antenna 213. The wireless communication unit 21 may include a plurality of transmission processing units 211, a plurality of reception processing units 212, and a plurality of antennas 213. When the wireless communication unit 21 supports multiple radio access methods, each part of the wireless communication unit 21 may be configured separately for each radio access method. For example, the transmission processing unit 211 and the reception processing unit 212 may be configured separately for LTE and NR. In addition, the antenna 213 may include a plurality of antenna elements (e.g., a plurality of patch antennas). In this case, the wireless communication unit 21 may be configured to be beamformable. The wireless communication unit 21 may be configured to be capable of performing polarization beamforming using vertical polarization waves (V polarization waves) and horizontal polarization waves (H polarization waves).

[0132] The transmission processing unit 211 performs transmission processing of downlink control information and downlink data. The transmission processing unit 211 encodes the downlink control information and downlink data input from the control unit 23 using an encoding method such as block coding, convolutional coding, or Turbo coding. Here, the encoding may be performed by polar code encoding or low-density parity-check code (LDPC code) encoding. Then, the transmission processing unit 211 modulates the encoded bits using a predetermined modulation scheme such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. In this case, the signal points on the constellation do not have to be equidistant. The constellation may be a non-uniform constellation (NUC). The transmission processing unit 211 multiplexes the modulation symbols of each channel and the downlink reference signal, and configures the multiplexing result in a predetermined resource element. Then, the transmission processing unit 211 performs various types of signal processing on the multiplexed signal. For example, the transmission processing unit 211 performs processing such as conversion to the frequency domain by fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, quadrature modulation, upconversion, removal of additional frequency components, and power amplification. The signal generated by the transmission processing unit 211 is transmitted from the antenna 213.

[0133] The receiving processing unit 212 processes the uplink signal received via the antenna 213. The receiving processing unit 212 performs downconversion on the uplink signal, removes unnecessary frequency components, controls the amplification level, performs quadrature demodulation, converts it into a digital signal, removes the guard interval (cyclic prefix), extracts the frequency-domain signal through fast Fourier transform, and so on. In this case, the receiving processing unit 212 separates uplink channels such as the physical uplink shared channel PUSCH and the physical uplink control channel PUCCH, as well as uplink reference signals, from the signal that has undergone the above processing. The receiving processing unit 212 demodulates the received signal with respect to the modulation symbols of the uplink channel using a modulation scheme such as binary phase shift keying (BPSK) or quadrature phase shift keying (QPSK). The modulation scheme for demodulation can be 16-quadrature amplitude modulation (16QAM), 64QAM, or 256QAM. In this case, the signal points on the constellation do not have to be equidistant. The constellation can be a non-uniform constellation (NUC). The receiving processing unit 212 decodes the encoded bits of the demodulated uplink channel. The decoded uplink data and uplink control information are output to the control unit 23.

[0134] The antenna 213 is an antenna device (antenna unit) that converts current and radio waves into each other. The antenna 213 may include one antenna element (e.g., one patch antenna) or may include multiple antenna elements (e.g., multiple patch antennas). When the antenna 213 includes multiple antenna elements, the wireless communication unit 21 may be configured to be beamformable. For example, the wireless communication unit 21 may be configured to generate a directional beam by controlling the directivity of the radio signal using multiple antenna elements. Note that the antenna 213 may be a dual-polarized antenna. When the antenna 213 is a dual-polarized antenna, the wireless communication unit 21 may use vertical polarization waves (V polarization waves) and horizontal polarization waves (H polarization waves) to transmit radio signals. Then, the wireless communication unit 21 may control the directivity of the radio signals transmitted using vertical polarization waves and horizontal polarization waves. In addition, the wireless communication unit 21 may transmit and receive spatially multiplexed signals via multiple layers including multiple antenna elements.

[0135] The storage unit 22 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, or a hard disk. The storage unit 22 serves as the storage device of the base station 20.

[0136] The control unit 23 is a controller that controls each unit of the base station 20. The control unit 23 is implemented by a processor such as a CPU or an MPU, for example. For example, the control unit 23 is implemented by a processor that uses a RAM or the like as a working area to execute various programs stored in a storage device inside the base station 20. Note that the control unit 23 can be implemented by an integrated circuit such as an ASIC or an FPGA. Any one of the CPU, MPU, ASIC, and FPGA can be regarded as a controller. In addition, in addition to or instead of the CPU, the control unit 23 can be implemented by a GPU.

[0137] As Figure 6 shown, the control unit 23 includes an acquisition unit 231 and a notification unit 232. Each module (acquisition unit 231 to notification unit 232) constituting the control unit 23 is a functional module representing the functions of the control unit 23. These functional modules can be software modules or hardware modules. For example, each of the above functional modules can be either a software module implemented by software (including microprogram) or a circuit module on a semiconductor chip (die). Obviously, each functional module can be a processor or an integrated circuit. Note that the control unit 23 can be composed of functional units different from the above functional modules. The configuration method of the functional modules is arbitrary. The operation of each module of the control unit 23 can be the same as the operation of each module of the control unit 33 of the terminal device 30. In addition, the operation of each module of the control unit 23 can be the same as the operation of each module of the control unit 43 of the terminal device 40.

[0138] In this embodiment, a base station can be configured by a collection of multiple physical or logical devices. For example, in this embodiment, a base station can be differentiated into multiple devices, such as a baseband unit (BBU) and a radio unit (RU). Then, the base station can be interpreted as an assembly of multiple devices. Additionally, the base station can be either one or both of the BBU and the RU. The BBU and the RU can be connected through a predetermined interface (e.g., enhanced common public radio interface (eCPRI)). The RU can be paraphrased as a remote radio unit (RRU) or a radio DoT (RD). Furthermore, the RU can correspond to the gNB distributed unit (gNB-DU) described later. Additionally, the BBU can correspond to the gNB central unit (gNB-CU) described later. Alternatively, the RU can be a wireless device connected to the gNB-DU described later. The gNB-CU, gNB-DU, and the RU connected to the gNB-DU can be configured to conform to the Open Radio Access Network (O-RAN). Additionally, the RU can be a device integrally formed with an antenna. The antenna included in the base station (e.g., the antenna integrally formed with the RU) can adopt an advanced antenna system and support MIMO (e.g., full-dimension (FD)-MIMO) or beamforming. Additionally, the antenna included in the base station can include, for example, 64 transmit antenna ports and 64 receive antenna ports.

[0139] Additionally, the antenna installed on the RU can be an antenna panel including one or more antenna elements, and the RU can be installed with one or more antenna panels. For example, the RU can be installed with two antenna panels, a horizontally polarized antenna panel and a vertically polarized antenna panel, or two antenna panels, a clockwise circularly polarized antenna panel and a counterclockwise circularly polarized antenna panel. Additionally, the RU can form and control independent beams for each antenna panel.

[0140] Note that multiple base stations can be connected to each other. One or more base stations can be included in a radio access network (RAN). In this case, the base station can be abbreviated as RAN, RAN node, access network (AN), or AN node. Note that the RAN in LTE is sometimes referred to as the evolved universal terrestrial RAN (EUTRAN). Additionally, the RAN in NR can be called NGRAN. Furthermore, the RAN in W-CDMA (UMTS) is sometimes referred to as UTRAN.

[0141] Note that an LTE base station can be referred to as an evolved Node B (eNodeB) or eNB. In this case, the EUTRAN includes one or more eNodeBs (eNBs). In addition, an NR base station can be referred to as a gNodeB or gNB. In this case, the NGRAN includes one or more gNBs. The EUTRAN can include a gNB (en-gNB) connected to the core network (EPC) in the LTE communication system (EPS). Similarly, the NGRAN can include an ng-eNB connected to the core network 5GC in the 5G communication system (5GS).

[0142] When the base station is an eNB, gNB, etc., the base station can be referred to as 3GPP access. In addition, when the base station is a radio access point, the base station can be referred to as non-3GPP access. In addition, the base station can be an optical extension device called a remote radio head (RRH) or radio unit (RU). In addition, in the case where the base station is a gNB, the base station can be a combination of the above gNB-CU and gNB-DU, or either the gNB-CU or gNB-DU.

[0143] Here, the gNB-CU hosts multiple higher layers in the access stratum (e.g., Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), and Packet Data Convergence Protocol (PDCP)) for communication with the UE. On the other hand, the gNB-DU hosts multiple lower layers in the access stratum (e.g., Radio Link Control (RLC), Medium Access Control (MAC), and Physical Layer (PHY)). In other words, in the messages / information described later, the RRC signaling (semi-static notification) can be generated by the gNB-CU, while the MAC CE and DCI (dynamic notification) can be generated by the gNB-DU. Alternatively, in the RRC configuration (semi-static notification), for example, some configurations such as IE: cellGroupConfig can be generated by the gNB-DU, while the remaining configurations can be generated by the gNB-CU. These configurations can be sent and received via the F1 interface described later.

[0144] Note that the base station can be configured to be able to communicate with another base station. For example, when multiple base stations are eNBs or a combination of eNBs and en-gNBs, the base stations can be connected via the X2 interface. In addition, in the case where multiple base stations are gNBs or a combination of ng-eNBs and gNBs, the devices can be connected via the Xn interface. In addition, in the case where multiple base stations are a combination of gNB-CU and gNB-DU, the devices can be connected via the above F1 interface. Messages / information described later (e.g., RRC signaling, MAC control element (MAC CE), or DCI) can be sent between multiple base stations via, for example, the X2 interface, Xn interface, or F1 interface.

[0145] A cell provided by a base station is referred to as, for example, a serving cell. A serving cell may include a primary cell (PCell) and a secondary cell (SCell). When dual connectivity is configured for a UE (e.g., the terminal device 30), the PCell provided by the master node (MN) and zero or one or more SCell(s) may be referred to as a primary cell group. Examples of dual connectivity include EUTRA-EUTRA dual connectivity, EUTRA-NR dual connectivity (ENDC), EUTRA-NR dual connectivity with 5GC, NR-EUTRA dual connectivity (NEDC), and NR-NR dual connectivity.

[0146] In addition, a serving cell may include a primary secondary cell (PSCell) or a primary SCG cell. In other words, when dual connectivity is set up for a UE, the PSCell provided by the secondary node (SN) and zero or one or more SCell(s) are referred to as a secondary cell group (SCG). Unless specifically configured (e.g., PUCCH on SCell), the physical uplink control channel (PUCCH) is transmitted in the PCell and the PSCell, but not in the SCell. In addition, radio link failures are also detected in the PCell and the PSCell, but not in the SCell (may not be detected). As described above, since the PCell and the PSCell have special roles in the serving cell, they are also referred to as special cells (SpCell).

[0147] In a cell, a downlink component carrier and an uplink component carrier may be associated. In addition, the system bandwidth corresponding to a cell may be divided into multiple bandwidth parts (BWPs). In this case, one or more BWPs may be set for the UE, and the UE may use one BWP as the active BWP. Additionally, the radio resources (e.g., frequency bandwidth, parameter set (subcarrier spacing), and time slot configuration) that the terminal device 30 can use may be different for each cell, each component carrier, or each BWP.

[0148] <2-4. Configuration of the First Terminal Device>

[0149] Next, the configuration of the terminal device 30 (the first terminal device) will be described. The terminal device 30 may be paraphrased as the user equipment (UE) 30.

[0150] As described above, the terminal device 30 is a first terminal device capable of performing communication based on a first sidelink communication scheme. For example, the terminal device 30 is a URLLC terminal. Here, the URLLC terminal is a terminal device capable of performing communication based on a sidelink communication scheme that allows signals from multiple terminal devices to exist in one radio resource of one time slot. Note that the terminal device 30 may use a second sidelink communication scheme in addition to the first sidelink communication scheme.

[0151] Any form of computer can be used as the terminal device 30. The terminal device 30 may be a mobile terminal, such as a mobile phone, a smart device (smartphone or tablet), a personal digital assistant (PDA), or a notebook PC. In addition, the terminal device 30 may be an imaging device with communication capabilities (e.g., a camera). In addition, the terminal device 30 may be a motorcycle, a mobile relay vehicle, etc., on which a communication device such as an FPU is installed. In addition, the terminal device 30 may be a machine-to-machine (M2M) device or an Internet of Things (IoT) device. In addition, the terminal device 30 may be a wearable device such as a smartwatch.

[0152] In addition, the terminal device 30 may be an xR device, such as an augmented reality (AR) device, a virtual reality (VR) device, and a mixed reality (MR) device. At this time, the xR device may be an eye-worn device such as AR glasses and MR glasses, or may be a head-mounted device such as a VR head-mounted display. When the terminal device 30 is an xR device, the terminal device 30 may be a standalone device including only a user-worn part (e.g., an eye-worn part). In addition, the terminal device 30 may be a terminal interlocking device including a user-worn part (e.g., an eye-worn part) and a terminal part (e.g., a smart device) interlocked with the user-worn part.

[0153] Note that the terminal device 30 may be configured to be connectable to multiple communication paths. For example, the terminal device 30 may be configured to be connectable to two communication paths, Wi-Fi (registered trademark) and a cellular network. The terminal device 30 may be connected to multiple cellular networks. At this time, the multiple cellular networks may be associated with different subscriber identity modules (SIMs).

[0154] Note that the terminal device 30 may be configured to be able to switch and use multiple SIM cards. For example, the terminal device 30 may be dual-SIM or triple-SIM compatible. Obviously, the terminal device 30 may be configured to be able to insert more than three SIM cards. In addition, the terminal device 30 may be a remote SIM provisioning (RSP). For example, the terminal device 30 may be eSIM-compatible. The RSP-compatible terminal device can rewrite information about wireless communication (hereinafter referred to as a profile) without replacing the SIM card.

[0155] In addition, the terminal device 30 can perform NOMA communication with the base station 20. Moreover, when the terminal device 30 communicates with the base station 20, an automatic retransmission technique such as HARQ can be used. In addition, the terminal device 30 can perform sidelink communication with another terminal device 30. When performing sidelink communication, the terminal device 30 can also use an automatic retransmission technique such as HARQ. Note that the terminal device 30 can also be capable of performing NOMA communication for communication (sidelink) with other terminal devices 30. In addition, the terminal device 30 can be capable of performing LPWA communication with other communication devices (e.g., the base station 20 and other terminal devices 30). In addition, the wireless communication used by the terminal device 30 can be wireless communication using millimeter waves. Note that the wireless communication (including sidelink communication) used by the terminal device 30 can be wireless communication using radio waves or wireless communication using infrared rays or visible light (light).

[0156] In addition, the terminal device 30 can be a mobile device. A mobile device is a mobile wireless communication device. In this case, the terminal device 30 can be a wireless communication device installed in a moving body or can be the moving body itself. For example, the terminal device 30 can be a vehicle moving on a road, such as a car, a bus, a truck, or a motorcycle, or a wireless communication device installed on the vehicle. Note that the moving body can be a mobile terminal or can be a moving body traveling on land (narrowly on the ground), underground, on water, or underwater. In addition, the moving body can be a moving body traveling in the atmosphere, such as a drone or a helicopter, or can be a moving body traveling outside the atmosphere, such as an artificial satellite.

[0157] The terminal device 30 can be connected to multiple base stations or multiple cells simultaneously to perform communication. For example, when one base station supports a communication area via multiple cells (e.g., pCell and sCell), the multiple cells can be bundled, and communication can be performed between the base station 20 and the terminal device 30 through carrier aggregation (CA) technology, dual connectivity (DC) technology, or multi-connectivity (MC) technology. Alternatively, the terminal device 30 and multiple base stations 20 can communicate with each other through coordinated multi-point transmission and reception (CoMP) technology via cells of different base stations 20.

[0158] Figure 7 is a diagram showing a configuration example of the terminal device 30 according to an embodiment of the present disclosure. The terminal device 30 includes a wireless communication unit 31, a storage unit 32, and a control unit 33. Note that Figure 7 the configuration shown in is a functional configuration, and the hardware configuration can be different from the functional configuration. In addition, the functions of the terminal device 30 can be implemented in a distributed manner in multiple physically separated structures.

[0159] The wireless communication unit 31 is a signal processing unit for performing wireless communication with other wireless communication devices (e.g., the base station 20, the terminal device 40, and other terminal devices 30). The wireless communication unit 31 operates under the control of the control unit 33. The wireless communication unit 31 includes a transmission processing unit 311, a reception processing unit 312, and an antenna 313. The configurations of the wireless communication unit 31, the transmission processing unit 311, the reception processing unit 312, and the antenna 313 may be similar to those of the wireless communication unit 21, the transmission processing unit 211, the reception processing unit 212, and the antenna 213 of the base station 20. In addition, the wireless communication unit 31 may be configured to be beam-formable similarly to the wireless communication unit 21. Further, similar to the wireless communication unit 21, the wireless communication unit 31 may be configured to be capable of transmitting and receiving spatially multiplexed signals.

[0160] The storage unit 32 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, or a hard disk. The storage unit 32 serves as the storage device of the terminal device 30.

[0161] The control unit 33 is a controller that controls each part of the terminal device 30. The control unit 33 is implemented by a processor such as a CPU or an MPU, for example. For example, the control unit 33 is implemented by a processor that uses a RAM or the like as a working area to execute various programs stored in the storage device inside the terminal device 30. Note that the control unit 33 may be implemented by an integrated circuit such as an ASIC or an FPGA. Any one of the CPU, MPU, ASIC, and FPGA may be regarded as a controller. Further, in addition to or instead of the CPU, the control unit 33 may be implemented by a GPU.

[0162] As Figure 7 shown, the control unit 33 includes an acquisition unit 331 and a notification unit 332. Each module (acquisition unit 331 to notification unit 332) constituting the control unit 33 is a functional module representing the functions of the control unit 33. These functional modules may be software modules or hardware modules. For example, each of the above functional modules may be a software module implemented by software (including microprogram) or a circuit module on a semiconductor chip (die). Obviously, each functional module may be a processor or an integrated circuit. The control unit 33 may be configured by functional units different from the above functional modules. The configuration method of the functional modules is arbitrary. The operation of each module of the control unit 33 may be the same as that of each module of the control unit 23 of the base station 20. In addition, the operation of each module of the control unit 33 may be the same as that of each module of the control unit 43 of the terminal device 40.

[0163] <2-5. Configuration of the Second Terminal Device>

[0164] Next, the configuration of the terminal device 40 (second terminal device) will be described. The terminal device 40 can be paraphrased as a user equipment (UE) 40.

[0165] As described above, the terminal device 40 is a second terminal device that communicates based on a second sidelink communication scheme different from the first sidelink communication scheme. For example, the terminal device 40 is a URLLC terminal. Here, a non-URLLC terminal is a terminal device capable of communicating based on a sidelink communication scheme in which a signal from one terminal device exists in one radio resource of one time slot. Other configurations of the terminal device 40 are similar to those of the terminal device 30. For example, as the terminal device 40, any form of computer such as a mobile terminal, an imaging device, an M2M device, an IoT device, a wearable device, or an xR device can be adopted similar to the terminal device 30.

[0166] Figure 8 is a diagram showing a configuration example of the terminal device 40 according to an embodiment of the present disclosure. The terminal device 40 includes a wireless communication unit 41, a storage unit 42, and a control unit 43. Note that Figure 8 the configuration shown in is a functional configuration, and the hardware configuration may be different from the functional configuration. In addition, the functions of the terminal device 40 can be implemented in a distributed manner in a plurality of physically separated configurations.

[0167] The wireless communication unit 41 is a signal processing unit for performing wireless communication with other wireless communication devices (for example, the base station 20, the terminal device 30, and other terminal devices 40). The wireless communication unit 41 operates under the control of the control unit 43. The wireless communication unit 41 includes a transmission processing unit 411, a reception processing unit 412, and an antenna 413. These configurations may be similar to the wireless communication unit 31, the transmission processing unit 311, the reception processing unit 312, and the antenna 313 of the terminal device 30.

[0168] The storage unit 42 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, or a hard disk. The storage unit 42 serves as a storage device of the terminal device 40.

[0169] The control unit 43 is a controller that controls each part of the terminal device 40. The configuration of the control unit 43 is similar to that of the control unit 33 of the terminal device 30. As Figure 8As shown, the control unit 43 includes an acquisition unit 431 and a notification unit 432. Each module (acquisition unit 431 to notification unit 432) constituting the control unit 43 is a functional module representing the functions of the control unit 43. These functional modules can be software modules or hardware modules. For example, each of the above functional modules can be a software module implemented by software (including microprograms), or a circuit module on a semiconductor chip (die). Obviously, each functional module can be a processor or an integrated circuit. Note that the control unit 43 can be composed of functional units different from the above functional modules. The configuration method of the functional modules is arbitrary.

[0170] The operation of each module of the control unit 43 can be the same as the operation of each module of the control unit 23 of the base station 20. In addition, the operation of each module of the control unit 43 can be the same as the operation of each module of the control unit 33 of the terminal device 30. Other configurations of the terminal device 40 can be the same as those of the terminal device 30.

[0171] <<3. Sidelink Communication>>

[0172] Above, the configuration of the communication system 1 has been described. Before describing the operation of the communication system 1, sidelink communication will be described. In the following description, the UE can be the terminal device 30 or the terminal device 40. In addition, the BS can be the base station 20.

[0173] <3-1. Overview of Sidelink Communication>

[0174] Figure 9 is a diagram showing an outline of sidelink communication. The usage scenarios of sidelink communication are roughly divided into two types. The first is the case where two or more UEs exist inside the cell C configured by the BS. The second case is where at least one of two or more UEs exists inside the cell C and the other UEs exist outside the cell C. At this time, the UE existing inside the cell C can communicate with the BS in addition to sidelink communication. As a result, the UE existing inside the cell C serves as a relay station that relays between the BS and the UEs existing outside the cell C.

[0175] When the UE is inside cell C, it can be said that the UE is in a state where the quality of the downlink signal received from the BS is equal to or higher than a predetermined standard. In other words, when the UE is outside cell C, it can be said that the UE is in a state where the quality of the downlink signal received from the BS is equal to or lower than the predetermined standard. Additionally, when the UE is inside cell C, it can be said that the UE is in a state where a predetermined downlink channel received from the BS can be decoded with a predetermined probability or a greater probability. In other words, when the UE is outside cell C, it can be said that the UE is in a state where the predetermined downlink channel received from the BS cannot be decoded with a predetermined probability or a greater probability.

[0176] In the following description, a UE that receives information on sidelink communication from a base station and transmits a sidelink control channel may be referred to as a transmitting device, and other UEs may be referred to as receiving devices.

[0177] <3-2. Details of Sidelink Communication>

[0178] Sidelink communication is direct communication between a UE and a UE different from the UE. In sidelink communication, a resource pool is set in the UE. The resource pool is candidate time and frequency resources for sidelink transmission and reception. The UE selects resources for sidelink transmission and reception from the resource pool and performs sidelink communication. Since sidelink communication is performed using uplink resources (uplink subframes and uplink component carriers), the resource pool is also set in the uplink subframe or uplink component carrier.

[0179] The sidelink physical channels include a Physical Sidelink Control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), and a Physical Sidelink Feedback Channel (PSFCH).

[0180] As described above, the frame configurations used in conventional sidelink communication schemes are, for example, Figure 1 and Figure 2 the configurations shown in. Figure 1 Shows the sidelink frame configuration when the PSCCH has a two-symbol configuration, the DMRS has a two-symbol allocation, and there is no PSFCH. Additionally, Figure 2 shows the sidelink frame configuration when the PSCCH has a three-symbol configuration, the DMRS has a three-symbol allocation, and there is a PSFCH.

[0181] The PSCCH is used to transmit sidelink control information (SCI). The PSCCH includes two symbols or three symbols. The mapping of the information bits of the sidelink control information is defined as the SCI format. The sidelink control information includes sidelink authorization. The sidelink authorization is used to schedule the PSSCH.

[0182] The PSSCH is used to transmit sidelink data (sidelink shared channel (SL-SCH)). The PSSCH can also be used to transmit upper layer control information.

[0183] The PSFCH is used to feedback the HARQ response (HARQ-ACK or ACK / NACK) of the decoding result of the PSSCH to the transmitting device. The PSFCH is arranged in the 13th symbol. The resources of the PSFCH may not be allocated to all time slots. In this case, the resources can be used as the PSSCH.

[0184] The sidelink frame configuration includes AGC symbols. The AGC symbols can be used for automatic gain control (AGC) of the receiving terminal device. The AGC symbols are located in the first symbol transmitted. Specifically, when transmitting the PSSCH, the AGC symbols are arranged in the first symbol, and when transmitting the PSFCH, the AGC symbols are arranged in the 12th symbol. The AGC symbols are generated by copying the second symbol transmitted. In other words, in sidelink transmission, the first symbol and the second symbol transmitted are the same. The sidelink frame configuration includes guard symbols. The sidelink, transmission and reception are switched by the guard symbols (guard time). The guard symbols are arranged in the 14th symbol. In addition, in the time slot where the PSFCH is transmitted, the guard symbols are also arranged in the 11th symbol.

[0185] The resource pool is set from the BS to the UE through SIB or dedicated RRC messages. Alternatively, the resource pool is set through information about the resource pool preset in the UE. The time resource pool is indicated by period information, offset information, and subframe bitmap information. The frequency resource pool is indicated by the start position of the resource block, the end position of the resource block, and the number of consecutive resource blocks.

[0186] <3-3. Sidelink Resource Pool>

[0187] Figure 10 It is a diagram showing the sidelink resource pool. In the sidelink, the resource pool (sidelink resource pool) is set as the resource for the transmission and reception of the PSSCH. On the frequency axis, the resource pool is configured with one or more consecutive subchannels. A subchannel includes one or more consecutive physical resource blocks (PRBs). The number and size of the subchannels are set by upper layer parameters.

[0188] The subchannel is used as the resource allocation unit of the frequency axis in the sidelink. The subchannel allocation of the sidelink transmission is determined by the frequency resource allocation included in the SCI. The subchannels are indexed in ascending order of frequency.

[0189] The time slots set as the resource pool are indicated by a bitmap. Each bit of the bitmap corresponds to a time slot that can be set as a sidelink resource pool. For example, when the bit value is 1, the corresponding time slot is set as the resource pool. When the bit value is 0, the corresponding time slot is not set as the resource pool. The length of the bitmap is set by the upper layer.

[0190] Time slots including sidelink synchronization signal (S-SS) / physical sidelink broadcast channel (PSBCH) blocks are not set as resource pools. In addition, time slots that do not semi-statically include a predetermined number of uplink symbols are not set as resource pools. Additionally, reserved time slots are not set as resource pools.

[0191] Note that the device for setting the resource pool can be a device other than the BS. Examples of devices other than the BS include a representative UE (primary terminal device or master terminal device).

[0192] <3-4. Sidelink Resource Allocation Method>

[0193] As sidelink resource allocation methods, there are sidelink resource allocation mode 1 and sidelink resource allocation mode 2. Resource allocation mode 1 is a method in which the BS allocates resources for the UE to send data on the sidelink physical channel (PSCCH or PSSCH). Resource allocation mode 2 is a method in which the UE itself performs sensing and selects resources for the UE to send data on the sidelink physical channel. These resource allocation modes will be described in detail below.

[0194] (1) Resource Allocation Mode 1

[0195] In resource allocation mode 1, when a transmission packet appears in the UE, the BS selects and allocates resources from the resource pool that will be used for the transmission of the packet.

[0196] In resource allocation mode 1, the resources for sidelink transmission are specified by dynamic authorization or RRC signaling sent from the BS. Specifically, in resource allocation mode 1, for PSSCH transmission and PSCCH transmission, dynamic authorization, configured grant type 1, and configured grant type 2 are supported. In sidelink dynamic authorization, PSSCH transmission is scheduled by DCI format 3_0. In sidelink configured grant type 1, resources for PSSCH transmission are allocated by RRC signaling. In sidelink configured grant type 2, the configured grant is activated by DCI format 3_0. Then, PSSCH transmission is performed using the resources specified by RRC signaling.

[0197] In resource allocation mode 1, since resources are allocated by the BS each time a transmission packet appears, the frequency of conflicts between sidelink communications can be reduced. On the other hand, a large signaling overhead is required between the BS and the UE.

[0198] (2) Resource Allocation Mode 2

[0199] In Resource Allocation Mode 2, the resource pool is pre - allocated to the UE. Alternatively, in Resource Allocation Mode 2, the resource pool is allocated by the BS / network.

[0200] In Resource Allocation Mode 2, the UE can select sidelink resources in the resource selection window or reserve future sidelink resources based on the measurement results of the interference pattern in the sensing window and the sidelink resource reservation status in the sensing window. By using the prediction results, the UE can select or reserve sidelink resources available for the transmission of packets, i.e., sidelink resources predicted not to be used for the transmission of another packet.

[0201] In Resource Allocation Mode 2, a small signaling overhead is required between the BS and the UE, but packet collisions may occur.

[0202] In Resource Allocation Mode 2, the resource allocation mode is classified into the following four types.

[0203] · Resource Allocation Mode 2(a)

[0204] · Resource Allocation Mode 2(b)

[0205] · Resource Allocation Mode 2(c)

[0206] · Resource Allocation Mode 2(d)

[0207] Resource Allocation Mode 2(a) is a mode in which the UE autonomously selects sidelink resources for transmission. Resource Allocation Mode 2(b) is a mode in which the UE assists another transmitting terminal in sidelink resource selection. Resource Allocation Mode 2(c) is a mode in which sidelink transmission is performed through the configured grant. Resource Allocation Mode 2(d) is a mode in which the terminal device schedules sidelink transmissions to another UE.

[0208] In the following, the above - mentioned four types of resource allocation modes will be described in detail.

[0209] · Resource Allocation Mode 2(a)

[0210] In resource allocation mode 2(a), when a packet appears in a UE, the UE autonomously selects sidelink resources from the resource pool to be used for transmitting the packet. The UE that transmits the packet first performs sensing to find sidelink resources from the resource pool to be used for transmitting the packet. Next, the UE selects sidelink resources from the resource pool based on the result of the sensing. Then, the UE uses the selected sidelink resources to transmit the packet. In addition, at this time, the UE reserves sidelink resources as needed for subsequent packet transmissions. Resource allocation mode 2(a) can be applied to semi-persistent methods and dynamic methods. In the semi-persistent method, resources are selected for multiple sidelink transmissions with different transport blocks. In the dynamic method, resources are selected for each transmitted sidelink transmission each time.

[0211] · Resource allocation mode 2(b)

[0212] In resource allocation mode 2(b), the UE assists in selecting sidelink resources of other transmitting terminals.

[0213] · Resource allocation mode 2(c)

[0214] In resource allocation mode 2(c), a sidelink transmission mode is set in the UE. The UE selects sidelink resources to be used for transmission according to the sidelink transmission mode set. The sidelink transmission mode is defined by time, frequency resource size and location, and the number of resources. Multiple sidelink transmission modes can be set. When only one sidelink transmission mode is set, the UE does not perform sensing. On the other hand, when multiple sidelink transmission modes are set, the UE performs sensing and selects a sidelink transmission mode based on the sensing result. In out-of-coverage operations, one or more sidelink transmission modes defined in each sidelink resource pool are preset. In addition, in in-coverage operations, one or more sidelink transmission modes defined in each sidelink resource pool are set from the BS.

[0215] · Resource allocation mode 2(d)

[0216] Resource allocation mode 2(d) is applied to group-based sidelink communication including three or more UEs. Figure 11This is a diagram showing resource allocation mode 2(d). In this group, a representative UE (master terminal device or main terminal device) is defined. The representative UE reports information about other UEs (slave terminal devices, auxiliary terminal devices, or member terminal devices) in the group to the BS. The BS provides resource pool settings and resource settings for each UE in the group via the representative UE. In resource allocation mode 2(d), since member UEs do not need a direct connection to the BS, the signaling overhead of the Uu link (communication link between the BS and the UE) can be reduced. The UE that can be the representative UE and the functions that can be provided depend on the capabilities of the UE. The representative UE can provide predetermined auxiliary information to the member UEs. Examples of the auxiliary information include resource pool settings, conflict information, COT sharing information, CSI, and information about the congestion level.

[0217] <3-5. Sensing in sidelink communication>

[0218] In resource allocation mode 2, a sensing process is supported. Decoding of SCI from other UEs and / or measurement of sidelink resources are used as sensing in sidelink communication.

[0219] In sensing by SCI decoding, the UE obtains information about the sidelink resources to be used, which is included in the SCI sent from other UEs. Based on the information from the SCI, the UE determines the sidelink resources to be used for transmission while avoiding the resources scheduled to be used by other UEs.

[0220] In sensing based on measurement of sidelink resources, the UE measures the layer 1 (L1) sidelink reference signal received power (RSRP) based on the sidelink demodulation reference signal (DMRS). When the measured RSRP is higher than a predetermined threshold, the UE identifies that the measured sidelink resources are used for transmission by another UE and determines the sidelink resources to be used for transmission while avoiding using the measured sidelink resources.

[0221] In this way, the UE selects or reselects sidelink resources based on the results of the above sensing process.

[0222] <3-6. Sidelink communication in this embodiment>

[0223] Sidelink communication as a conventional operation in this embodiment can be based on the radio access methods of LTE V2X and NR V2X. Here, in this embodiment, a sidelink transmission is understood as a set of sidelink channels and / or signals sent from a certain transmitting terminal (Tx UE) to a predetermined receiving terminal (Rx UE) by unicast, multicast, or broadcast. In other words, in Figure 1In the example, the AGC, PSCCH, PSSCH, DMRS, and GUARD transmitted in all symbols within a time slot are a sidelink transmission in conventional operations. In Figure 2 In the example, the AGC, PSCCH, PSSCH, DMRS, and GUARD transmitted in the first to 11th symbols of a time slot are a sidelink transmission, while the AGC, PSFCH, and GUARD transmitted in the 12th to 14th symbols of a time slot are a sidelink transmission. Note that the same transmitting terminal (Tx UE) can continuously perform multiple sidelink transmissions. In this case, these transmissions are different sidelink transmissions.

[0224] <<4. Operation of the communication system>>

[0225] The sidelink communication has been described above. Next, the operation of communication system 1 will be described.

[0226] <4-1. Overview of the operation of the communication system>

[0227] Figure 12 is a diagram showing an example of the communication environment assumed in this embodiment. In this embodiment, as an example, it is assumed that the first terminal device (terminal device 30) is a URLLC terminal, and the second terminal device (terminal device 40) is a non-URLLC terminal. Then, in this embodiment, it is assumed that the transmitting station and the receiving station of each of the URLLC terminal and the non-URLLC terminal exist in one environment.

[0228] Each sidelink terminal performs sidelink communication when receiving assistance such as synchronization from the base station 20. The transmitting station and the receiving station of the URLLC terminal perform sidelink communication based on a sidelink communication scheme (for example, a communication scheme that does not depend on the time slot boundary), in which signals from multiple terminal devices can exist in one radio resource of a time slot. In addition, the transmitting station and the receiving station of the non-URLLC terminal perform sidelink communication based on a sidelink communication scheme (for example, a communication scheme according to the time slot boundary), in which signals from one terminal device exist in one radio resource of a time slot. Note that the transmitting station and the receiving station are communication devices that perform transmission or reception at this timing. The transmitting station and the receiving station can be switched according to the observed timing.

[0229] Note that in the following description, the sidelink communication scheme used by the transmitting station and the receiving station of the URLLC terminal (where the signals from multiple terminal devices can exist in one radio resource of one time slot) can be referred to as the first sidelink communication scheme, but the first sidelink communication scheme is not limited to this example. In addition, the sidelink communication scheme used by the transmitting station and the receiving station of the non-URLLC terminal (the sidelink communication scheme where the signals from multiple terminal devices exist in one radio resource of one time slot) can be referred to as the second sidelink communication scheme, but the second sidelink communication scheme is not limited to this example.

[0230] First, the URLLC terminal obtains control information (hereinafter also referred to as the first control information) about the signal transmitted based on the first sidelink communication scheme. For example, the URLLC terminal performs a sensing operation for the URLLC control information (the first control information). The URLLC terminal performs the sensing operation when it is not performing transmission. Note that the URLLC terminal can be configured to also perform the sensing operation when performing transmission. Here, the sensing operation refers to the operation in which the terminal device receives the control signal transmitted by another terminal device and obtains the control information therein. Through this operation, the terminal device can know the usage status of the radio resources of another terminal device.

[0231] When traffic appears, the transmitting station of the URLLC terminal selects the radio resources to be used for sidelink transmission based on the scheduling information of another URLLC terminal sensed so far. Thereafter, the transmitting station of the URLLC terminal generates the first control information based on the information of the selected resources, and arranges and transmits the generated first control information at a predetermined radio resource position. At this time, the transmitting station of the URLLC terminal can transmit the first control information in a form included in the radio resources used for transmitting URLLC traffic. In addition, the transmitting station of the URLLC terminal can transmit the first control information by using radio resources different from the radio resources used for transmitting URLLC traffic.

[0232] In this embodiment, the transmitting station of the URLLC terminal generates second control information regarding the first control information. The second control information may include, for example, information about the resources selected by the transmitting station of the URLLC terminal for sidelink transmission of the URLLC signal (information about the first control information). In addition, the second control information may include information about the transmission timing of the signal transmitted by the URLLC terminal based on the first sidelink communication scheme. In addition, the second control information may include information about the time slots used by the URLLC terminal in communication based on the first sidelink communication scheme. In addition, the second control information may include information obtained by converting the signal transmission performed by the URLLC terminal based on the first sidelink communication scheme into the interference amount per time slot. In addition, the second control information may include information about the resources reserved by the URLLC terminal for communication based on the first sidelink communication scheme (e.g., URLLC service transmission).

[0233] Note that the first control information is, for example, control information collected from another URLLC terminal and / or generated control information to be transmitted to another URLLC terminal. The transmitting station of the URLLC terminal may use the first control information itself as the second control information, or may integrate multiple pieces of the first control information collected from multiple URLLC terminals into one piece of information as the second control information.

[0234] Then, the transmitting station of the URLLC terminal transmits the second control information to the non-URLLC terminal. At this time, the transmitting station of the URLLC terminal notifies the second control information through a channel that can be received by the non-URLLC terminal based on the second sidelink communication scheme. The channel that can be received by the second terminal device may be a Physical Sidelink Control Channel (PSCCH) or a Physical Sidelink Shared Channel (PSSCH).

[0235] Note that the communication device that transmits the second control information is not limited to the URLLC terminal, and may be, for example, a base station or a non-URLLC terminal.

[0236] According to which communication device transmits the second control information, the transmission form of the second control information is classified into the following five forms (A1) to (A5).

[0237] (A1) Transmission by the transmitting station of the URLLC terminal

[0238] (A2) Transmission by the transmitting station of the representative URLLC terminal

[0239] (A3) Transmission by the receiving station of the URLLC terminal

[0240] (A4) Transmission by the base station 20

[0241] (A5)Transmission by a non-URLLC terminal capable of receiving control information from a URLLC terminal

[0242] Each of the above five forms will be described below.

[0243] <4-2. First form>

[0244] First, the case where the transmitting station of a URLLC terminal sends second control information to a non-URLLC terminal (the case of (A1) above) will be described.

[0245] In the first form, the terminal device that sends the second control information is a URLLC terminal (first terminal device) capable of communicating with another URLL terminal (first terminal device) based on a first sidelink communication scheme. More specifically, the terminal device that sends the second control information is the transmitting station of a URLLC terminal that obtains first control information from other URLLC terminals. The transmitting station of the URLLC terminal obtains first control information regarding a signal transmitted by itself to another URLLC terminal based on the first sidelink communication scheme. Then, the transmitting station of the URLLC terminal notifies a non-URLLC terminal (second terminal device) of second control information regarding the first control information.

[0246] Figure 13 is a sequence diagram when the transmitting station of the URLLC terminal sends the second control information. Hereinafter, reference will be made to Figure 13 the sequence diagram in to describe in detail the operation of the communication system 1 of the first form.

[0247] When traffic appears in the transmitting station of the URLLC terminal, the transmitting station of the URLLC terminal selects resources for sidelink transmission of the URLLC signal. The transmitting station of the URLLC terminal that has selected the resources sends control information (second control information) related to the URLLC signal to the non-URLLC terminal. The second control information may include, for example, information regarding the resources selected by the transmitting station of the URLLC terminal for sidelink transmission of the URLLC signal (information regarding the first control information). The second control information may also be the first control information as it is. The transmitting station of the URLLC terminal sends the second control information through a communication scheme that conforms to the second sidelink communication scheme. For example, the transmitting station of the URLLC terminal sends the second control information at a position that conforms to the time slot boundary so that the second control information can also be obtained by the non-URLLC terminal.

[0248] <4-3. Second form>

[0249] Next, the case where the transmitting station of a representative URLLC terminal sends second control information to a non-URLLC terminal (the case of (A2) above) will be described.

[0250] In the second form, the terminal device that sends the second control information is one of multiple URLLC terminals (first terminal devices). For example, the terminal device that sends the second control information is a representative terminal selected from multiple URLLC terminals. The representative terminal acquires the first control information of each of the multiple URLLC terminals. For example, the representative terminal acquires its own first control information from its own storage unit and acquires the first control information of another URLLC terminal. The representative terminal notifies the non-URLLC terminal (second terminal device) of the second control information generated based on the first control information of each of the multiple URLLC terminals.

[0251] Figure 14 is a sequence diagram when the sending station of the representative URLLC terminal sends the second control information. Hereinafter, the operation of the communication system 1 in the second form will be described in detail with reference to the sequence diagram in Figure 14 The operation of the communication system 1 in the second form will be described in detail with reference to the sequence diagram in

[0252] A specific terminal among the URLLC terminals is selected as the representative terminal (for example, the master terminal device or the main terminal device). The base station can determine the representative terminal, or multiple URLLC terminals can autonomously determine the representative terminal.

[0253] The operation of the communication system 1 when the base station 20 determines the representative terminal is as follows, for example. For example, the base station 20 selects the representative terminal based on the location information of each of the multiple URLLC terminals. Then, the base station 20 sends a signal for notifying the selected terminal that it has been selected as the representative terminal.

[0254] In addition, the operation of the communication system 1 when the URLLC terminal is autonomously determined is as follows, for example. For example, the URLLC terminal sends a signal to surrounding terminals to confirm whether there is a determined representative terminal. When there is already a representative terminal, the representative terminal that receives the signal sends a signal notifying the existence of the representative terminal. When there is no representative terminal, the URLLC terminal itself becomes the representative terminal.

[0255] The URLLC terminal determined as the representative terminal senses the first control information sent by another peripheral URLLC terminal (for example, the slave terminal device, the auxiliary terminal device, or the member terminal device). Thereafter, the representative terminal sends the second control information generated based on the collected first control information to the non-URLLC terminal. The second control information can be obtained by integrating multiple pieces of first control information into one piece of information. The second control information can also be the first control information as it is. In this case, when there are multiple pieces of first control information, there can be multiple pieces of second control information.

[0256] The sending station of the URLLC terminal sends one or more pieces of second control information through a communication scheme that complies with the second sidelink communication scheme. For example, the sending station of the URLLC terminal sends the second control information at a position that conforms to the slot boundary so that the second control information can also be obtained by non-URLLC terminals.

[0257] <4-4. Third form>

[0258] Next, the case where the receiving station of the URLLC terminal sends the second control information to the non-URLLC terminal (the case of (A3) above) will be described.

[0259] In the third form, the terminal device that sends the second control information is a URLLC terminal (the first terminal device) capable of communicating with another URLLC terminal. More specifically, the terminal device that sends the second control information is the receiving station of the URLLC terminal, which obtains the first control information from the sending station of another URLLC terminal. The receiving station of the URLLC terminal obtains the first control information about the signal sent by another URLLC terminal to the receiving station of the URLLC terminal based on the first sidelink communication scheme. The receiving station of the URLLC terminal notifies the non-URLLC terminal (the second terminal device) of the second control information about the first control information.

[0260] Figure 15 is a sequence diagram when the receiving station of the URLLC terminal sends the second control information. Hereinafter, the operation of the communication system 1 in the third form will be described in detail with reference to the Figure 15 sequence diagram in.

[0261] When traffic appears in the sending station of the URLLC terminal, the sending station of the URLLC terminal selects resources for the sidelink transmission of the URLLC signal. The sending station of the URLLC terminal that has selected the resources sends control information (the first control information) about the URLLC signal to the receiving station of the URLLC terminal.

[0262] Upon receiving the first control information, the receiving station of the URLLC terminal generates the second control information based on the received first control information. The second control information may include, for example, information about the resources selected by the sending station of the URLLC terminal for the sidelink transmission of the URLLC signal (information about the first control information). The second control information may also be the first control information as it is.

[0263] Then, the receiving station of the URLLC terminal sends the second control information to the non-URLLC terminal. The sending station of the URLLC terminal sends the second control information through a communication scheme that conforms to the second sidelink communication scheme. For example, the sending station of the URLLC terminal sends the second control information at a position that conforms to the time slot boundary so that the second control information can also be obtained by the non-URLLC terminal.

[0264] <4-5. Fourth form>

[0265] Next, the case where the base station 20 sends the second control information to the non-URLLC terminal (the case of (A2) above) will be described.

[0266] In the fourth form, the base station 20, instead of the URLLC terminal, sends the second control information to the non-URLLC terminal. The base station 20 performs processing related to the sidelink communication of the URLLC terminal. The base station 20 obtains the first control information of one or more URLL terminals (second terminal devices). The representative terminal notifies the non-URLLC terminal (second terminal device) of the second control information generated based on the first control information of the URLL terminal.

[0267] Figure 16 is the sequence diagram when the base station 20 sends the second control information. Hereinafter, the operation of the communication system 1 in the fourth form will be described in detail with reference to the Figure 16 sequence diagram in.

[0268] When traffic appears in the sending station of the URLLC terminal, the sending station of the URLLC terminal selects resources for the sidelink transmission of the URLLC signal. The sending station of the URLLC terminal that has selected the resources sends control information (first control information) about the URLLC signal to the base station 20.

[0269] When receiving the first control information, the base station 20 generates the second control information based on the received first control information. The second control information may include, for example, information about the resources selected by the sending station of the URLLC terminal for the sidelink transmission of the URLLC signal (information about the first control information). The second control information may also be the first control information as it is.

[0270] Then, the base station 20 sends the second control information to the non-URLLC terminal. The sending station of the URLLC terminal sends the second control information through a communication scheme that conforms to the second sidelink communication scheme. For example, the sending station of the URLLC terminal sends the second control information at a position that conforms to the time slot boundary so that the second control information can also be obtained by the non-URLLC terminal.

[0271] When the first control information is transmitted from the transmitting stations of multiple URLLC terminals, the base station 20 generates second control information based on the first control information collected from the multiple URLLC terminals. Then, the base station 20 transmits the generated second control information to non-URLLC terminals. The second control information can be obtained by integrating multiple pieces of first control information into one piece of information. The second control information can also be the first control information as it is. In this case, when there are multiple pieces of first control information, there can be multiple pieces of second control information. Note that, as described in the above <4-4. Third form>, the representative terminal can be configured to transmit the first control information (or second control information) of multiple URLLC terminals. In this case, the base station 20 can transmit the second control information generated based on the first control information (or second control information) received from the representative terminal to non-URLLC terminals.

[0272] Note that the base station 20 can pre-have the first control information (control information regarding URLLC signals) of multiple URLLC terminals. In this case, the base station transmits the second control information to non-URLLC terminals without obtaining the first control information from the transmitting stations of URLLC terminals. When the base station 20 performs this operation, the services of URLLC terminals are preferably periodic services. Then, the base station 20 can periodically collect the URLLC service information of URLLC terminals.

[0273] <4-6. Fifth form>

[0274] Next, the case where a non-URLLC terminal capable of receiving the control information of a URLLC terminal transmits the second control information to another non-URLLC terminal (the case of (A5) above) will be described.

[0275] In the fifth form, the terminal device that transmits the second control information is a non-URLLC terminal (second terminal device) that can receive the first control information transmitted by a URLLC terminal (first terminal device) based on the first sidelink communication scheme. The non-URLLC terminal obtains the first control information from the URLLC terminal. Then, the non-URLLC terminal notifies another non-URLLC terminal of the second control information regarding the first control information.

[0276] Figure 17 is a sequence diagram when a non-URLLC terminal capable of receiving the control information of a URLLC terminal transmits the second control information. Hereinafter, the operation of the communication system 1 in the fifth form will be described in detail with reference to the Figure 17 sequence diagram in.

[0277] When traffic appears at the transmitting station of a URLLC terminal, the transmitting station of the URLLC terminal selects resources for sidelink transmission of the URLLC signal. The transmitting station of the URLLC terminal that has selected the resources sends control information (first control information) about the URLLC signal to the receiving station of the URLLC terminal.

[0278] A non-URLLC terminal receives the first control information sent by the transmitting station of the URLLC terminal. When the first control information is received, the non-URLLC terminal generates second control information based on the received first control information. The second control information may include, for example, information about the resources selected by the transmitting station of the URLLC terminal for sidelink transmission of the URLLC signal (information about the first control information). The second control information may also be the first control information as it is.

[0279] Then, the non-URLLC terminal sends the second control information to another non-URLLC terminal. The non-URLLC terminal sends the second control information through a communication scheme that conforms to the second sidelink communication scheme. For example, the non-URLLC terminal sends the second control information at a position that conforms to the time slot boundary so that the second control information can also be acquired by another non-URLLC terminal.

[0280] <4-7. Transmission of Second Control Information>

[0281] Next, the transmission of the second control information to the non-URLLC terminal will be described.

[0282] First, the arrangement of the second control information in the resources will be described. As described in the first to fifth forms, the communication device (URLLC terminal, base station 20, or non-URLLC terminal) that has obtained the first control information sends the second control information through a communication scheme that conforms to the second sidelink communication scheme. At this time, the communication device may send the second control information by using an OFDM symbol different from the position of the conventional control signal defined in the standard. Figure 18 is a diagram showing a state in which the second control information is arranged at a position different from the position of the conventional control signal. At this time, the communication device may send the second control information by using an OFDM symbol that is the same as the position of the conventional control signal defined in the standard. Figure 19 is a diagram showing a state in which the second control information is arranged at the position of the conventional control signal.

[0283] The non-URLLC terminal acquires interference information about the URLLC terminal based on the second control information sent through the above operations. As a result, the non-URLLC terminal can obtain control information about the URLLC terminal, and thus can perform more efficient sidelink communication.

[0284] Next, the transmission timing of the second control information to the non-URLLC terminal will be described. The transmission of the second control information to the non-URLLC terminal can be performed before the transmission of the URLLC service is executed, or simultaneously with the transmission of the URLLC service. For example, the communication device can transmit the second control information at a timing when the information can be transmitted to the non-URLLC terminal immediately after determining the radio resources for transmitting the URLLC service. In addition, the communication device can repeatedly transmit the second control information to the non-URLLC terminal. In this case, the communication device can transmit the second control information at a constant period and at a timing when the information can be transmitted to the non-URLLC terminal. For example, assume that the transmitting station or base station of the representative URLLC terminal is the communication device that transmits the second control information. In this case, the communication device collects the first control information from the transmitting stations of the surrounding URLLC terminals at regular intervals. Then, the communication device transmits the second control information generated based on the first control information collected at regular intervals to the non-URLLC terminal.

[0285] In addition, the transmission of the second control information to the non-URLLC terminal can be performed during the transmission of the URLLC service. For example, when using multiple resources to transmit the URLLC service or when repeatedly transmitting the URLLC service, the communication device can transmit the second control information to the non-URLLC terminal after transmitting some URLLC services.

[0286] <4-8. Summary of the transmission of control information>

[0287] Hereinafter, the transmission of the control information according to the present embodiment will be summarized.

[0288] <4-8-1. Transmission of the first control information>

[0289] When the URLLC service appears, the transmitting station of the URLLC terminal transmits the control information for transmitting the URLLC service to another URLLC terminal to another communication device by using a predetermined symbol. In this symbol, for example, the PSCCH (first control information) for the URLLC terminal is stored. Note that the destination (another communication device) of the first control information can be a peripheral URLLC terminal or a terminal such as a base station that can receive URLLC control information. As long as the first control information can be received, the destination (another communication device) of the first control information can also be a non-URLLC terminal.

[0290] The first control information transmitted by the transmitting station of the URLLC terminal can include at least one of the following information (B1) to (B3).

[0291] (B1) Information about the transmission timing of the URLLC service storing the signal

[0292] (B2) Information on the number of symbols used in the transmission of URLLC services

[0293] (B3) Reservation information for the transmission of URLLC services

[0294] Here, the information (B1) is information on the time slots and symbols for transmitting the signals storing URLLC services. In this information, the time slot and OFDM index information are stored.

[0295] The information (B2) is information on the number of OFDM symbols for URLLC services in a time slot.

[0296] The information (B3) is information on the radio resources used when URLLC services are transmitted in the resources of the same time slot as the URLLC service or in the resources of a subsequent time slot, or after that. In this information, the repetition times of the radio resources to be used at equal intervals can be stored. In addition, when different OFDM symbol positions and subchannels are used in transmitting URLLC, this information can also be stored.

[0297] <4-8-2. Transmission of the second control information>

[0298] Non-URLLC terminals cannot receive the PSCCH of URLLC services that can be transmitted from the middle of a time slot. In other words, non-URLLC terminals cannot perform sidelink sensing (SL sensing) on URLLC services. Therefore, even in this case, a communication device (e.g., a URLLC terminal, a base station 20, or a non-URLLC terminal) capable of transmitting or receiving the first information notifies the non-URLLC terminal of the second control information regarding the first control information through a channel (e.g., PSCCH and / or PSSCH) that can be received by the non-URLLC terminal, so that the non-URLLC terminal can perform SL sensing (i.e., identification of the resource reservation state).

[0299] (1) Channels for transmitting the second control information

[0300] As the channels for transmitting the second control information, the following (C1) and (C2) are assumed.

[0301] (C1) PSCCH

[0302] In other words, the communication device transmits the second control information as control information of the physical layer through a channel in the physical layer. When the number of resources to be notified is less than a predetermined number, the communication device notifies the second control information through the PSCCH.

[0303] (C2) PSSCH

[0304] In other words, the communication device transmits control information as control information in the MAC or RRC layer through a channel in the MAC or RRC layer. When the number of resources to be notified is a predetermined number or more, the communication device notifies the second control information through the PSSCH.

[0305] (2) Resources for transmitting the second control information

[0306] The communication device may transmit the second control information at the transmission timing of the control information conforming to the next time slot. In addition, the communication device may transmit the second control information at a predetermined time and frequency resource after the next time slot. At this time, the resources for transmitting the second control information may be set by RRC signaling. At this time, the resources (e.g., sub-channel numbers) of the PSCCH that can be transmitted may be set in the communication device.

[0307] (3) Terminal device for transmitting the second control information

[0308] The communication device that transmits the second control information may be a URLLC terminal or a base station 20. In addition, the communication device that transmits the second control information may be a non-URLLC terminal capable of receiving the first information. When the terminal device transmits the second control information, the following (D1) and (D2) are assumed as the communication device that transmits the second control information.

[0309] (D1) Predetermined URLLC terminal explicitly set by RRC signaling

[0310] (D2) Predetermined terminal device implicitly determined based on predetermined conditions

[0311] Note that, as the terminal device (D2), for example, a URLLC terminal that uses a predetermined sub-channel in the previous time slot is assumed. In addition, as the terminal device (D2), for example, all URLLC terminals transmitted in the previous time slot are assumed.

[0312] (4) Content of the second control information

[0313] The second control information transmitted by the communication device may include at least one of the following information (E1) to (E5).

[0314] (E1) Information about the transmission timing of the signal storing the URLLC service

[0315] (E2) Information about the number of symbols used in the URLLC service transmission

[0316] (E3) Reservation information for the URLLC service transmission

[0317] (E4) Information about the interference amount of the time slot for transmitting the signal storing the URLLC service

[0318] (E5)Integrate information of signals storing URLLC services

[0319] Here, the information (E1) to (E3) is similar to the above-mentioned information (B1) to (B3). Note that the information (E3) can be reservation information for URLLC service transmission of resources in a time slot before the time slot to which the second control information is sent.

[0320] The information (E4) is information obtained by converting the interference of signals storing URLLC services into an interference amount per time slot. For example, the information (E4) is information about the interference amount per time slot calculated according to the number of symbols used for transmitting URLLC services.

[0321] The information (E5) is, for example, information integrating multiple signals transmitted from a single terminal device. In addition, the information (E5) is, for example, information integrating multiple signals transmitted from multiple terminal devices. The communication device can send the information (E5) to a non-URLLC terminal as one signal. The communication device sending the information (E5) can be a base station or a terminal device selected from multiple terminal devices.

[0322] (5. Modification)

[0323] The above embodiments are examples, and various modifications and applications are possible.

[0324] For example, the technology of this embodiment can be applied not only to sidelink communication using licensed frequency bands, but also to sidelink communication using unlicensed frequency bands.

[0325] In addition, the technology of this embodiment can be applied not only to sidelink communication, but also to other cellular communications such as uplink communication and downlink communication. In this case, the description of "sidelink communication" in the above embodiments can be replaced by "cellular communication". In this case, one of the first terminal device and the second terminal device can be the base station 20 (or relay station). Both the first terminal device and the second terminal device can be the base station 20 (and / or relay station).

[0326] In the above embodiments, the first sidelink communication scheme is a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource in one time slot. In the above embodiments, the second sidelink communication scheme is a sidelink communication scheme in which signals from multiple terminal devices exist in one radio resource in one time slot. However, the second sidelink communication scheme is not limited to this example.

[0327] For example, the first sidelink communication scheme may be a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource (resource block) defined by a first criterion. Additionally, the second sidelink communication scheme may be a sidelink communication scheme in which signals from the multiple terminal devices exist in one radio resource (resource block) defined by a second criterion different from the first criterion. The first criterion and the second criterion may be different cellular communication standards. For example, the first criterion and the second criterion may be criteria defined in the LTE standard, may be standards defined in the 5G standard, or may be other standards (e.g., standards defined in cellular communication standards for 5G and later).

[0328] Additionally, the sidelink communication scheme may include sidelink communication schemes other than the first sidelink communication scheme and the second sidelink communication scheme (e.g., a third sidelink communication scheme, a fourth sidelink communication scheme, etc.). In this case, the technology of this embodiment can also be applied.

[0329] In the above embodiment, the communication device obtains first control information sent by the first terminal device (or the communication device itself) based on the first sidelink communication scheme, and sends second control information based on the first control information to the second terminal device. The information to be obtained / sent by the communication device is not limited to control information. For example, the communication device may obtain first information sent by the first terminal device (or the communication device itself) based on the first sidelink communication scheme, and send second information based on the first information to the second terminal device. At this time, the first information and the second information may be information other than control information. For example, the first information and the second information may be user data.

[0330] The control device that controls the management device 10, the base station 20, the terminal device 30, and the terminal device 40 of this embodiment can be implemented by a dedicated computer system or a general computer system.

[0331] For example, a communication program for performing the above operations is stored and distributed on a computer-readable recording medium such as an optical disc, a semiconductor memory, a magnetic tape, or a floppy disk. Then, for example, the program is installed on a computer, and the above processing is executed to configure the control device. Here, the control device may be a device external to the management device 10, the base station 20, the terminal device 30, and the terminal device 40 (e.g., a personal computer). Additionally, the control device may be a device internal to the management device 10, the base station 20, the terminal device 30, and the terminal device 40 (e.g., the control unit 13, the control unit 23, the control unit 33, and the control unit 43).

[0332] In addition, the above communication program can be stored in a disk device included in a server device on a network such as the Internet so that the communication program can be downloaded to a computer. In addition, the above functions can be achieved through the cooperation of an operating system (OS) and application software. In this case, the part other than the OS can be stored in a medium and distributed, or the part other than the OS can be stored in a server device and downloaded to a computer.

[0333] In the processes described in the above embodiments, all or part of the processes described as being automatically performed can be performed manually, or all or part of the processes described as being manually performed can be automatically performed by a known method. In addition, unless otherwise specified, the processing procedures, specific names, and information including various data and parameters shown in the above documents and drawings can be arbitrarily changed. For example, the various types of information shown in each drawing are not limited to the information shown.

[0334] In addition, each component of each device shown in the drawings is a functional concept, and is not necessarily physically configured as shown in the drawings. That is, the specific form of the distribution and integration of each device is not limited to the form shown, and all or part of it can be functionally or physically distributed and integrated in any unit according to various loads, usage conditions, etc. Note that such a configuration by distribution and integration can be dynamically executed.

[0335] In addition, the above embodiments can be appropriately combined in areas where the processing contents do not conflict with each other. In addition, the order of each step shown in the flowcharts of the above embodiments can be appropriately changed.

[0336] In addition, for example, the present embodiment can be implemented in any configuration constituting a device or a system, such as a processor such as a system large scale integration (LSI), a module using multiple processors, a unit using multiple modules, a collection obtained by further adding other functions to the unit, etc. (that is, a configuration of a part of a device).

[0337] Note that in the present embodiment, a system means a group of multiple components (devices, modules (parts), etc.), and it does not matter whether all components are in the same housing. Therefore, both multiple devices housed in separate housings and connected via a network and one device in which multiple modules are housed in one housing are systems.

[0338] In addition, for example, the present embodiment can adopt a cloud computing configuration in which a function is collaboratively shared and processed by multiple devices via a network.

[0339] <<6. Conclusion>>

[0340] As described above, according to an embodiment of the present disclosure, the communication system 1 includes a terminal device 30 (e.g., a URLLC terminal) capable of communicating based on a first sidelink communication scheme and a terminal device 40 (e.g., a non-URLLC terminal) capable of communicating based on a second sidelink communication scheme different from the first sidelink communication scheme. The terminal device 30 obtains first control information regarding a signal transmitted based on the first sidelink communication scheme. Then, the terminal device 30 notifies the terminal device 40 of second control information regarding the first control information. For example, the terminal device 30 notifies the second control information based on the second sidelink communication scheme through a channel receivable by the terminal device 40.

[0341] Thereby, the terminal device 40 can recognize the control information of the terminal device 30. Thus, between the terminal device 30 and the terminal device 40, adjustment of sidelink communication (e.g., adjustment of radio resource utilization) is successfully performed. As a result, the communication system 1 can achieve sidelink communication with high communication performance.

[0342] Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present disclosure. In addition, components of different embodiments and modifications can be appropriately combined.

[0343] Note that the effects of each embodiment described in this specification are merely examples and are not limited thereto, and other effects can be provided.

[0344] The present technology may also have the following configurations.

[0345] (1) A terminal device capable of communicating with a first terminal device, the first terminal device being capable of communicating based on a first sidelink communication scheme, the terminal device including:

[0346] An acquisition unit that acquires first control information regarding a signal transmitted based on the first sidelink communication scheme; and

[0347] A notification unit that notifies a second terminal device of second control information regarding the first control information, the second terminal device communicating based on a second sidelink communication scheme different from the first sidelink communication scheme.

[0348] (2) The terminal device according to (1), wherein

[0349] The first sidelink communication scheme is a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource of one time slot, and

[0350] The second sidelink communication scheme is a sidelink communication scheme in which a signal from one terminal device exists in a radio resource of a time slot.

[0351] (3) The terminal device according to (2), wherein

[0352] The notification unit notifies the second control information based on the second sidelink communication scheme through a channel that can be received by the second terminal device.

[0353] (4) The terminal device according to (3), wherein

[0354] The channel that can be received by the second terminal device includes a Physical Sidelink Control Channel (PSCCH).

[0355] (5) The terminal device according to (3) or (4), wherein

[0356] The channel that can be received by the second terminal device includes a Physical Sidelink Shared Channel (PSSCH).

[0357] (6) The terminal device according to any one of (2) to (5), wherein

[0358] The first control information includes information about the transmission timing of the signal transmitted by the first terminal device based on the first sidelink communication scheme.

[0359] (7) The terminal device according to any one of (2) to (6), wherein

[0360] The first control information includes information about the number of symbols used by the first terminal device for communication based on the first sidelink communication scheme.

[0361] (8) The terminal device according to any one of (2) to (7), wherein

[0362] The second control information includes information about the resources used by the first terminal device for communication based on the first sidelink communication scheme.

[0363] (9) The terminal device according to any one of (2) to (8), wherein

[0364] The second control information includes information about the transmission timing of the signal transmitted by the first terminal device based on the first sidelink communication scheme.

[0365] (10) The terminal device according to any one of (2) to (9), wherein

[0366] The second control information includes information about the time slot used by the first terminal device for communication based on the first sidelink communication scheme.

[0367] (11) The terminal device according to any one of (2) to (10), wherein

[0368] The second control information includes information obtained by converting the transmission of a signal performed by the first terminal device based on the first sidelink communication mode into the interference amount per time slot.

[0369] (12) The terminal device according to any one of (2) to (11), wherein

[0370] The second control information includes information obtained by integrating a plurality of pieces of first control information.

[0371] (13) The terminal device according to any one of (2) to (12), wherein

[0372] The second control information includes information about resources reserved for the communication of the first terminal device based on the first sidelink communication scheme.

[0373] (14) The terminal device according to any one of (1) to (13), wherein

[0374] The terminal device is a first terminal device capable of communicating with other first terminal devices. The acquisition unit acquires first control information about a signal transmitted from the terminal device to the other first terminal devices based on the first sidelink communication scheme, and the notification unit notifies the second terminal device of second control information about the first control information.

[0375] (15) The terminal device according to any one of (1) to (13), wherein

[0376] The terminal device is one of a plurality of first terminal devices,

[0377] The acquisition unit acquires the first control information of each of the plurality of first terminal devices, and the notification unit notifies the second terminal device of second control information generated based on the first control information of each of the plurality of first terminal devices.

[0378] (16) The terminal device according to (15), wherein

[0379] The second control information includes information obtained by integrating the first control information of each of the plurality of first terminal devices.

[0380] (17) The terminal device according to any one of (1) to (13), wherein

[0381] The terminal device is a first terminal device capable of communicating with other first terminal devices. The acquisition unit acquires first control information regarding a signal transmitted from the other first terminal devices to the terminal device based on a first sidelink communication scheme, and the notification unit notifies a second terminal device of second control information regarding the first control information.

[0382] (18) The terminal device according to any one of (1) to (13), wherein

[0383] The terminal device is a second terminal device capable of receiving first control information based on a first sidelink communication scheme,

[0384] The acquisition unit acquires first control information from a first terminal device, and the notification unit notifies other second terminal devices of second control information regarding the first control information.

[0385] (19) A base station that performs processing related to sidelink communication with a first terminal device, where the first terminal device is capable of performing communication based on a first sidelink communication scheme. The base station includes:

[0386] An acquisition unit that acquires first control information regarding a signal transmitted based on a first sidelink communication scheme; and

[0387] A notification unit that notifies a second terminal device of second control information regarding the first control information, where the second terminal device performs communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

[0388] (20) A communication system includes: a terminal device capable of communicating with a first terminal device, where the first terminal device is capable of performing communication based on a first sidelink communication scheme; and a base station that performs processing related to sidelink communication with the first terminal device, wherein one of the terminal device and the base station includes

[0389] An acquisition unit that acquires first control information regarding a signal transmitted based on a first sidelink communication scheme, and

[0390] A notification unit that notifies a second terminal device of second control information regarding the first control information, where the second terminal device performs communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

[0391] List of reference numerals

[0392] 1 Communication system

[0393] 10 Management device

[0394] 20 Base station

[0395] 30, 40 Terminal devices

[0396] 11 Communication Unit

[0397] 21, 31, 41 Wireless Communication Units

[0398] 12, 22, 32, 42 Storage Units

[0399] 13, 23, 33, 43 Control Units

[0400] 211, 311, 411 Transmission Processing Units

[0401] 212, 312, 412 Reception Processing Units

[0402] 213, 313, 413 Antennas

[0403] 231, 331, 431 Acquisition Units

[0404] 232, 332, 432 Notification Units

Claims

1. A terminal device capable of communicating with a first terminal device, the first terminal device being capable of performing communication based on a first sidelink communication scheme, the terminal device comprising: An acquisition unit that acquires first control information regarding a signal transmitted based on the first sidelink communication scheme; And A notification unit that notifies a second terminal device of second control information regarding the first control information, the second terminal device performing communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

2. The terminal device according to claim 1, wherein The first sidelink communication scheme is a sidelink communication scheme in which signals from multiple terminal devices can exist in one radio resource of one time slot, and The second sidelink communication scheme is a sidelink communication scheme in which a signal from one terminal device exists in one radio resource of one time slot.

3. The terminal device according to claim 2, wherein The notification unit notifies the second control information based on the second sidelink communication scheme through a channel that can be received by the second terminal device.

4. The terminal device according to claim 3, wherein The channel that can be received by the second terminal device includes a Physical Sidelink Control Channel (PSCCH).

5. The terminal device according to claim 3, wherein The channel that can be received by the second terminal device includes a Physical Sidelink Shared Channel (PSSCH).

6. The terminal device according to claim 2, wherein The first control information includes information regarding the transmission timing of a signal transmitted by the first terminal device based on the first sidelink communication scheme.

7. The terminal device according to claim 2, wherein The first control information includes information regarding the number of symbols used by the first terminal device for communication based on the first sidelink communication scheme.

8. The terminal device according to claim 2, wherein The second control information includes information regarding the resources used by the first terminal device for communication based on the first sidelink communication scheme.

9. The terminal device according to claim 2, wherein The second control information includes information regarding the transmission timing of a signal transmitted by the first terminal device based on the first sidelink communication scheme.

10. The terminal device according to claim 2, wherein The second control information includes information regarding the time slot used by the first terminal device for communication based on the first sidelink communication scheme.

11. The terminal device according to claim 2, wherein The second control information includes information obtained by converting the transmission of a signal performed by the first terminal device based on the first sidelink communication method into the interference amount per time slot.

12. The terminal device according to claim 2, wherein The second control information includes information obtained by integrating multiple pieces of first control information.

13. The terminal device according to claim 2, wherein The second control information includes information regarding the resources reserved for the communication of the first terminal device based on the first sidelink communication scheme.

14. The terminal device according to claim 1, wherein The terminal device is a first terminal device capable of communicating with other first terminal devices, An obtaining unit obtains first control information regarding a signal transmitted from a terminal device to the other first terminal device based on a first sidelink communication scheme, and a notification unit notifies a second terminal device of second control information regarding the first control information.

15. The terminal device according to claim 1, wherein the terminal device is one of a plurality of first terminal devices, the obtaining unit obtains first control information of each of the plurality of first terminal devices, and the notification unit notifies the second terminal device of second control information generated based on the first control information of each of the plurality of first terminal devices.

16. The terminal device according to claim 15, wherein the second control information includes information obtained by integrating the first control information of each of the plurality of first terminal devices.

17. The terminal device according to claim 1, wherein the terminal device is a first terminal device capable of communicating with other first terminal devices, the obtaining unit obtains first control information regarding a signal transmitted from the other first terminal device to the terminal device based on the first sidelink communication scheme, and the notification unit notifies the second terminal device of second control information regarding the first control information.

18. The terminal device according to claim 1, wherein the terminal device is a second terminal device capable of receiving the first control information based on the first sidelink communication scheme, the obtaining unit obtains the first control information from the first terminal device, and the notification unit notifies other second terminal devices of second control information regarding the first control information.

19. A base station that performs processing related to sidelink communication with a first terminal device, the first terminal device being capable of performing communication based on a first sidelink communication scheme, the base station includes: an obtaining unit that obtains first control information regarding a signal transmitted based on the first sidelink communication scheme; and a notification unit that notifies a second terminal device of second control information regarding the first control information, the second terminal device performing communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

20. A communication system, comprising: A terminal device capable of communicating with the first terminal device, the first terminal device being capable of performing communication based on the first sidelink communication scheme; and a base station that performs processing related to sidelink communication with the first terminal device, wherein one of the terminal device and the base station includes an obtaining unit that obtains first control information regarding a signal transmitted based on the first sidelink communication scheme, and a notification unit that notifies a second terminal device of second control information regarding the first control information, the second terminal device performing communication based on a second sidelink communication scheme different from the first sidelink communication scheme.

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