Base station device, base station device control method, terminal device, and terminal device control method

Abstract

A base station device (20, 30) is provided with a communication unit (21, 31) and a control unit (24, 34). The communication unit (21, 31) communicates with the terminal device (40, 50). The control unit (24, 34), when at least one symbol included in a slot format set in the terminal device (40, 50) is a symbol for performing communication other than side link communication, transmits to the terminal device (40, 50) information enabling the terminal device (40, 50) to use the at least one symbol as a symbol for performing side link communication.

Description

[Technical field]

[0001] The present disclosure relates to a base station device, a control method for a base station device, a terminal device, and a control method for a terminal device. [Background technology]

[0002] In recent years, mobile communication systems that support communication for moving objects have been proposed. In addition, mobile communication systems are required to support Vehicle-to-Everything (V2X) communication for automobiles. Until now, V2X communication has been developed based on LTE. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-208796 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, there are various use cases for V2X communication, and in order to support those use cases, various requirements (e.g., communication reliability, delay, etc.) must be met. However, conventional LTE-based V2X communication cannot fully meet these requirements, and there is a risk of communication performance deteriorating.

[0005] Therefore, the present disclosure proposes a base station apparatus, a base station apparatus control method, a terminal apparatus, and a terminal apparatus control method that contribute to realizing high communication performance. [Means for solving the problem]

[0006] In order to solve the above problem, a base station device according to an embodiment of the present disclosure includes a communication unit and a control unit. The communication unit communicates with a terminal device. When at least one symbol included in a slot format set for the terminal device is a symbol for performing communication other than sidelink communication, the control unit transmits, to the terminal device, information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram for explaining V2X communication. [Diagram 2] FIG. 1 is a diagram showing an example of an overall view of V2X communication. [Diagram 3] FIG. 1 is a diagram illustrating an example of a use case of V2X communication. [Figure 4] FIG. 1 is a diagram illustrating an example of V2V communication according to scenario 1. [Diagram 5] FIG. 13 is a diagram illustrating an example of V2V communication according to scenario 2. [Figure 6] FIG. 11 is a diagram illustrating an example of V2V communication according to scenario 3. [Figure 7] FIG. 11 is a diagram showing an example of V2V communication according to scenario 4. [Figure 8] FIG. 11 is a diagram showing an example of V2V communication according to scenario 5. [Figure 9] FIG. 11 is a diagram showing an example of V2V communication according to scenario 6. [Figure 10] FIG. 1 is a diagram illustrating the frame structure of NR. [Figure 11] FIG. 13 is a diagram illustrating an example of subcarrier spacing setting. [Figure 12] FIG. 2 illustrates an example of a resource grid. [Figure 13] FIG. 2 is a diagram showing a slot format. [Figure 14] FIG. 2 is a diagram showing a slot format. [Figure 15] FIG. 1 is a diagram illustrating a configuration example of an information processing system according to an embodiment of the present disclosure. [Figure 16] FIG. 1 is a diagram illustrating a specific configuration example of an information processing system. [Figure 17] FIG. 2 is a diagram illustrating a configuration example of a management device according to an embodiment of the present disclosure. [Figure 18A] FIG. 2 is a diagram illustrating a configuration example of a base station device according to an embodiment of the present disclosure. [Figure 18B] FIG. 2 is a diagram illustrating a configuration example of a base station device according to an embodiment of the present disclosure. [Figure 19] FIG. 2 is a diagram illustrating a configuration example of a base station device according to an embodiment of the present disclosure. [Figure 20] FIG. 2 is a diagram illustrating a configuration example of a terminal device according to an embodiment of the present disclosure. [Figure 21] FIG. 1 is a diagram illustrating an example of a configuration of a mobile device according to an embodiment of the present disclosure. [Figure 22] FIG. 1 illustrates an example of a slot format including symbols for implementing sidelink communication. [Figure 23] FIG. 1 illustrates an example of a slot format including symbols for implementing sidelink communication. [Figure 24] FIG. 1 illustrates an example of a slot format including symbols for implementing sidelink communication. [Diagram 25] FIG. 1 illustrates an example of a slot format including symbols for implementing sidelink communication. [Figure 26] FIG. 1 illustrates an example of a slot format including symbols for implementing sidelink communication. [Figure 27] FIG. 13 is a diagram illustrating an example of a notification of a configuration. [Figure 28] FIG. 13 is a diagram showing an example of symbol rewriting. [Figure 29] FIG. 13 is a diagram showing a symbol rewrite pattern in a slot format. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the following embodiments, the same components are designated by the same reference numerals, and duplicated descriptions will be omitted.

[0009] In addition, in this specification and drawings, multiple components having substantially the same functional configuration may be distinguished by adding different numbers after the same reference symbol. For example, multiple components having substantially the same functional configuration may be distinguished as necessary, such as base station devices 201 and 202. However, if there is no need to particularly distinguish between multiple components having substantially the same functional configuration, only the same reference symbol is used. For example, if there is no need to particularly distinguish between base station devices 201 and 202, they will simply be referred to as base station device 20.

[0010] The present disclosure will be described in the following order. 1. Introduction 1-1.Overview of V2X communication 1-2.V2X Use Cases 1-3. Physical layer enhancement 1-4.V2X Operation Scenarios 1-5. Overview of this embodiment 2. Information Processing System Configuration 2-1. Overall configuration of information processing system 2-2. Management device configuration 2-3. Base Station Equipment (Network) Configuration 2-4. Base Station Equipment (Infrastructure) Configuration 2-5. Terminal device configuration 2-6. Configuration of mobile device 3. Operation of the information processing system 3-1. New design of slot format 3-2.How to set the slot format 3-3.How to change the slot format 4. Variations 5. Conclusion

[0011] <<1. Introduction>> Traditionally, mobile communication systems have provided communication functions for mobile terminals such as mobile phones and smartphones. However, in recent years, it has become important for mobile communication systems to also support communications for other types of moving objects, such as automobiles, drones, and robots, that are different from mobile terminals.

[0012] For example, in recent years, mobile communication systems are required to support vehicle-to-everything (V2X) communication for automobiles. Examples of automobile communication include road-to-vehicle communication realized by an intelligent transportation system (ITS) and vehicle-to-vehicle communication realized by side link communication. These communication technologies have the potential to become important technologies for realizing autonomous driving in the future.

[0013] Here, V2X communication is communication between a vehicle and "something". FIG. 1 is a diagram for explaining V2X communication. Here, examples of "something" include a vehicle, an infrastructure, a network, and a pedestrian. Communication between vehicles is called V2V (Vehicle-to-Vehicle) communication. Communication between a vehicle and an infrastructure is called V2I (Vehicle-to-Infrastructure) communication. Communication between a vehicle and a network is called V2N (Vehicle-to-Network) communication. Communication between a vehicle and a pedestrian is called V2P (Vehicle-to-Pedestrian) communication. In this embodiment, a vehicle, an infrastructure, a network, and a pedestrian in V2X may communicate with each other as a UE (User Equipment), or may communicate with each other as a base station (Radio Access Network).

[0014] <1-1.Overview of V2X communication> FIG. 2 is a diagram showing an example of an overall picture of V2X communication. In the example of FIG. 2, a cloud server has a V2X APP server (Application Server) function. The cloud server is connected to a core network via a network such as the Internet. The core network is composed of devices having a control function for V2X communication. A plurality of base stations are connected to the core network. The base station (RAN) has a function of wireless communication with a terminal device (an example of a UE, a vehicle in the example of FIG. 2) (e.g., a Uu link connection function using a Uu interface). The base station also has a function of supporting direct communication (e.g., side link communication) such as V2V communication and V2P communication. In addition, RSUs (Road Side Units) are placed on the road as infrastructure. There are two possible types of RSUs: a base station type RSU and a UE type RSU. The RSU has, for example, a V2X APP provision function, a data relay function, and the like.

[0015] <1-2. V2X Use Cases> Until now, development of wireless communication for automobiles has mainly been focused on 802.11p-based DSRC (Dedicated Short Range Communication). However, in recent years, LTE-based V2X, which is an in-vehicle communication based on LTE (Long Term Evolution), has been standardized. LTE-based V2X communication supports the exchange of basic safety messages. In recent years, NR V2X communication using 5G technology (NR: New Radio) has been considered with the aim of further improving V2X communication.

[0016] FIG. 3 is a diagram showing examples of use cases of V2X communication. Use cases of V2V communication include forward approach warning, intersection collision prevention, emergency vehicle warning, platooning, overtaking stop warning, road construction warning, etc. Use cases of V2I communication include notification of road safety information, traffic signal cooperation, parking assistance, charging, etc. Use cases of V2P communication include warning of vulnerable road users, etc. Use cases of V2N communication include dynamic link sharing, remote driving, and in-company entertainment.

[0017] NR V2X communication supports new use cases that require high reliability, low latency, high-speed communication, and high capacity, which could not be supported by LTE-based V2X until now. In the example of Figure 3, examples include providing dynamic maps and remote driving. Other use cases include sensor data sharing, which exchanges sensor data between vehicles and between roads and vehicles, and platooning for platooning. These use cases and requirements for NR V2X communication are described in 3GPP TR22.886, etc. The following (1) to (4) are brief explanations of some of the use cases.

[0018] (1) Vehicles Platooning One use case for NR V2X communication is platooning. Platooning refers to multiple vehicles traveling in the same direction in a platoon. Information to control the platooning is exchanged between the vehicle leading the platooning and the other vehicles. NR V2X communication is used for this information exchange. By exchanging information using NR V2X communication, it is possible to further shorten the distance between vehicles in a platoon.

[0019] (2)Extended Sensors A use case for NR V2X communication is the exchange of sensor-related information (raw data before data processing and processed data). Sensor information is collected through local sensors, live video images between surrounding vehicles, RSUs, and pedestrians, V2X application servers, etc. Through this information exchange, vehicles can obtain information that cannot be obtained from their own sensor information, enabling them to perceive / recognize a wider range of the environment. In this use case, a large amount of information needs to be exchanged, so a high data rate is required for communication.

[0020] (3) Advanced Driving Use cases for NR V2X communication include semi-autonomous driving and fully autonomous driving. RSUs share the recognition / recognition information obtained from their own sensors with surrounding vehicles. This allows each vehicle to adjust its trajectory and operation in a synchronized and coordinated manner. Using NR V2X communication, each vehicle can also share its driving intentions and intent with surrounding vehicles.

[0021] (4) Remote Driving Use cases for NR V2X communication include remote control by a remote pilot or V2X applications. Remote control is used, for example, for people who cannot drive or in dangerous areas. Cloud computing-based control can also be used for public transport where the route and road are somewhat fixed. This use case requires high reliability and low transmission latency for communication.

[0022] Note that the above-described use cases are merely examples, and the use cases of the V2X communication of the present embodiment may be other use cases.

[0023] <1-3. Physical Layer Enhancement> To achieve the above requirements, further enhancements to the physical layer will be required from LTE V2X. The links in question include Uu links, which are links between infrastructure such as base stations and RSUs and terminals, and PC5 links (side links), which are links between terminals. The following (1) to (9) are examples of the main enhancements.

[0024] (1) Channel Format (2) Sidelink Feedback Communication (3) Sidelink resource allocation method (4) Vehicle position information estimation technology (5) End-to-end relay communication (6) Support for unicast and multicast communication (7) Multi-carrier communication, carrier aggregation (8) MIMO / Beamforming (9) Supports high frequency (e.g. 6GHz or higher)

[0025] Examples of channel format enhancements in (1) include flexible numerology, short TTI (Transmission Time Interval), multi-antenna support, waveform, etc. Examples of sidelink feedback communication enhancements in (2) include HARQ, CSI (Channel Status Information), etc.

[0026] <1-4. V2X Operation Scenarios> Next, we will describe an example of a V2X communication operation scenario. In V2N communication, communication between a base station and a terminal is simple, using only DL / UL communication, but in V2V communication, various communication paths are possible. In the following explanation, each scenario is explained using an example of V2V communication, but similar communication operations can also be applied to V2P and V2I. In that case, the communication destination is not a vehicle, but a pedestrian, a base station, or an RSU.

[0027] (1) Scenario 1 FIG. 4 is an example of V2V communication according to scenario 1. In scenario 1, a car (an example of a UE) communicates directly with another car (an example of a UE) using sidelink communication. A sidelink is a communication link between terminals such as a PC5. In addition to a PC5, a sidelink may also be called a V2V communication link, a V2P communication link, a V2I communication link, and the like. In the example of FIG. 4, a car communicates directly with another car using sidelink communication without going through a radio access network. Note that, in the example of FIG. 4, an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is shown as the radio access network, but the radio access network is not limited to E-UTRAN. For example, the radio access network may be an NG-RAN.

[0028] (2) Scenario 2 FIG. 5 is an example of V2V communication according to scenario 2. In scenario 2, a car (an example of a UE) and a car communicate with each other via a radio access network. In the example of FIG. 5, data is transmitted from one car to multiple cars. In FIG. 5, Uu indicates a Uu interface. The Uu interface is a radio interface between a terminal and a base station. UL indicates an uplink, and DL indicates a downlink. In the example of FIG. 5, E-UTRAN is also shown as the radio access network, but the radio access network is not limited to E-UTRAN. For example, the radio access network may be NG-RAN.

[0029] (3) Scenario 3 FIG. 6 is an example of V2V communication according to scenario 3. In scenario 3, vehicles communicate with each other via an RSU and a radio access network. In the example of FIG. 6, data is also transmitted from one vehicle to multiple vehicles. In the example of FIG. 6, one vehicle and an RSU are connected by sidelink communication. In the example of FIG. 6, E-UTRAN is also shown as a radio access network, but the radio access network is not limited to E-UTRAN. For example, the radio access network may be NG-RAN. In addition, in FIG. 6, the RSU is shown as a device operating as a UE, but is not limited to this. For example, the RSU may operate as a RAN or as a part (e.g. gNB-DU, RRH, RRU) of the RAN (E-UTRAN or NG-RAN) in FIG. 6.

[0030] (4) Scenario 4 FIG. 7 is an example of V2V communication according to scenario 4. In scenario 4, vehicles communicate with each other via an RSU and a radio access network. In the example of FIG. 7, multiple vehicles and RSUs are connected by sidelink communication. In the example of FIG. 7, E-UTRAN is also shown as a radio access network, but the radio access network is not limited to E-UTRAN. For example, the radio access network may be NG-RAN. Also, in FIG. 6, the RSU is shown as a device operating as a UE, but is not limited to this. For example, the RSU may operate as a RAN or as a part (e.g. gNB-DU, RRH, RRU) of the RAN (E-UTRAN or NG-RAN) in FIG. 6.

[0031] (5) Scenario 5 FIG. 8 is an example of V2V communication according to scenario 5. In scenario 5, vehicles communicate with each other via an RSU, not via a radio access network. The RSU shown in FIG. 8 is a fixed-station type RSU. For example, the radio access network may be an NG-RAN. Also, in FIG. 6, the RSU is shown as a device operating as a UE, but is not limited to this. For example, the RSU may operate as a RAN, or may operate as a part (e.g., gNB-DU, RRH, RRU) of the RAN (E-UTRAN or NG-RAN) in FIG. 6.

[0032] (6) Scenario 6 Fig. 9 is an example of V2V communication according to scenario 6. In scenario 6, vehicles communicate with each other via an RSU, not via a radio access network. The RSU shown in Fig. 9 is a mobile station type RSU.

[0033] <1-5. Overview of this embodiment> Previous V2X communications (e.g., V2X communications in 3GPP Rel. 12 or later) used LTE radio frames. For example, in previous V2X communications, sidelink communications such as the sidelink control channel (PSCCH: Physical Sidelink Control Channel) and the sidelink data channel (PSSCH: Physical Sidelink Shared Channel) were performed using LTE radio frames.

[0034] On the other hand, when LTE radio frames are used in NR V2X communication, for example, the requirements in the above-mentioned scenarios 1 to 6 may not be satisfied. In other words, in NR V2X communication, it is required to support the requirements of different service types, such as when performing high-speed, large-capacity communication (eMBB) or when performing low-latency, highly reliable (URLLC) communication for one vehicle (an example of a UE). However, in the LTE frame configuration, for example, when performing URLLC communication, there is a possibility that the ultra-latency requirement cannot be satisfied. For this reason, in NR V2X communication, for example, when performing URLLC communication, it is desirable to use NR numerology and frame configuration rather than LTE frame configuration. In other words, in NR V2X communication, in order to satisfy the requirements of different services, it is desirable to use NR numerology and frame configuration for NR sidelink communication.

[0035] [NR frame structure] Here, the frame configuration of NR will be described with reference to FIG. 10. FIG. 10 is a diagram showing the frame configuration of NR. As shown in FIG. 10, one radio frame is composed of 10 ms. One radio frame is composed of two half frames. The time interval of one half frame is 5 ms. Furthermore, one half frame is composed of five subframes. The time interval of one subframe is 1 ms. Furthermore, one subframe is composed of one or more slots. FIG. 10 shows an example in which one subframe is composed of four slots. Furthermore, the time interval of each slot differs depending on the numerology (OFDM numerology). Furthermore, the numerology is defined by a combination of a subcarrier spacing (SCS: Subcarrier Spacing) and a cyclic prefix (CP: Cyclic Prefix).

[0036] FIG. 11 is a diagram showing an example of subcarrier interval setting. As shown in FIG. 11, the subcarrier interval is defined as a power of 2 with 15 kHz as a reference. Specifically, the subcarrier interval is set to 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz. When the subcarrier interval is 15 kHz, the number of slots per subframe is one. That is, when the subcarrier interval is 15 kHz, the time interval of the slot is 1 ms, when the subcarrier interval is 30 kHz, it is 0.5 ms, when the subcarrier interval is 60 kHz, it is 0.25 ms, when the subcarrier interval is 120 kHz, it is 0.125 ms, and when the subcarrier interval is 240 kHz, it is 0.0625 ms. Also, as shown in FIG. 11, the number of symbols in one slot is 14 in the case of a normal CP (cyclic prefix) and 12 in the case of an extended CP.

[0037] [Resource Grid] Next, the resource grid will be described with reference to FIG. 12. FIG. 12 is a diagram showing an example of a resource grid. In this embodiment, a transmitted physical signal or a physical channel is represented by a resource grid in each numerology and subcarrier. The resource grid is defined by a plurality of resource elements. One resource element in a given antenna port is represented by one subcarrier and one symbol. That is, the index of a resource element in a given antenna port can be represented by a combination of a subcarrier index and a symbol index.

[0038] In this embodiment, a resource block (RB) is defined as a unit in the frequency axis direction. One resource block is composed of 12 subcarriers that are continuous in the frequency axis direction. The resource blocks include a common resource block (CRB), a physical resource block (PRB), and a virtual resource block (VRB). The common resource block is a resource block defined by a predetermined frequency bandwidth and a predetermined numerology. The common resource block starts from Point A in all numerologies. The frequency specified at Point A is the center of subcarrier #0 of the common resource block #0 in all numerologies. The physical resource block is a resource block defined within a predetermined frequency bandwidth part. Furthermore, the physical resource block index is numbered from 0 within the predetermined frequency bandwidth part. The virtual resource block is a logical resource block. The virtual resource block is used, for example, when mapping a precoded signal of a Physical Downlink Shared Channel (PDSCH) or a Physical Uplink Shared Channel (PUSCH) to a physical resource block.

[0039] [Slot format] Next, a slot format indicating the state of symbols included in a slot will be described. Figures 13 and 14 are diagrams showing slot formats. In a TDD (Time Division Duplex) cell (unpaired spectrum), each symbol included in a slot can be classified into a downlink (DL), uplink (UP), or flexible state. In Figures 13 and 14, downlink is written as "D", uplink is written as "U", and flexible is written as "F". In the following, downlink may be written as "downlink" and uplink as "uplink".

[0040] For example, when receiving information from a base station, the terminal device receives the information by using downlink symbols in the slot format. When transmitting information to a base station, the terminal device uses uplink symbols in the slot format. The terminal device can use flexible symbols in the slot format for either transmitting or receiving information to or from a base station. Alternatively, the flexible symbols may be used as a switching period or a guard period for downlink and uplink.

[0041] The state of each symbol in the slot format is set by information transmitted from the base station. Specifically, the state of each symbol is specified in terminal device common (e.g., cell specific) TDD configuration information (e.g., TDD-UL-DL-ConfigurationCommon) and terminal device specific (UE) TDD configuration information (TDD-UL-DL-ConfigDedicated) included in RRC (Radio Resource Control) messages (e.g., System Information Block Type 1 (SIB1), RRC Setup message, RRC Reconfiguration message) transmitted from the base station. For example, the TDD setting information common to all terminal devices includes the following information (1) to (5). (1) Number of downlink slots (e.g., nrofDownlinkSlots) and number of downlink symbols (e.g., nrofDownlinkSymbols) (2) Number of uplink slots (e.g., nrofUplinkSlots) and number of uplink symbols (e.g., nrofUplinkSymbols) (3) Uplink / downlink switching periodicity information (e.g. DL-UL-TransmissionPeriodicity) (4) The index of the target slot (e.g. slotIndex) (5) Information on each symbol in the target slot. For example, all downlink (all DL), all uplink (all UL), the number of downlink symbols (e.g. nrofDownlinkSymbols), and the number of uplink symbols (e.g. nrofUplinkSymbols).

[0042] Additionally or alternatively, the state of each symbol may be specified by a slot format index transmitted by DCI (e.g., DCI format 2_0). Specifically, the slot format index is an index of a slot format indicating a combination of the states of 14 symbols. The slot format index is specified on a slot-by-slot basis. The format specifying the slot format is also called a slot format indicator (SFI). The terminal device can set or change the uplink, downlink, and flexible symbol on a symbol-by-symbol basis, or recognize (Consider) the symbol to be used, using the above-mentioned TDD setting information or the slot format index specified by DCI.

[0043] Additionally or alternatively, the state of each symbol may be determined by a slot format specified by a combination of RRC signaling and DCI (e.g., DCI format 2_0). Specifically, one or more slot formats may be set in advance by RRC signaling, and one or more slot formats to be used by the UE may be determined by SFI_Index(s) included in DCI format 2_0. The one or more slot formats may be included in one or more slot format combinations included in RRC signaling. In this way, the terminal device can set or change uplink, downlink, and flexible symbols on a symbol-by-symbol basis according to a combination of RRC signaling and DCI (e.g., DCI format 2_0), and recognize (Consider) the symbols to be used.

[0044] The slot format set in the terminal device may be a kind of slot configuration set in the terminal device. That is, in the present invention, the slot format may be called a slot configuration. The slot configuration here includes setting information on one or more symbols in one or more slots. The setting information on one or more symbols includes information on the symbols described above or below (RRC and DCI parameters).

[0045] 13 and 14 show slot formats representing the states of 14 symbols. For example, the slot format shown in FIG. 13 shows that the 1st to 12th symbols are downlink symbols (D), the 13th symbol is a flexible symbol (F), and the 14th symbol is an uplink symbol (U). The SFIs for specifying the slot format shown in FIG. 13 are "DDDDDDDDDDDDFU" in order from the first symbol of the slot. This allows, for example, PDSCH and corresponding HARQ-ACK to be transmitted and received in the same slot.

[0046] Also, for example, the slot format shown in Fig. 14 indicates that the first symbol is a downlink symbol (D), the second symbol is a flexible symbol (F), and the third to fourteenth symbols are uplink symbols (U). The SFIs for specifying the slot format shown in Fig. 14 are "DFUUUUUUUUUUU" in order from the first symbol of the slot. This allows, for example, transmission and reception of a UL grant and a corresponding PUSCH in the same slot.

[0047] In conventional LTE V2X communication, subframes for uplink communication may be used for sidelink communication in the LTE frame configuration. In other words, conventional LTE V2X communication is set on a subframe basis, whereas NR V2X communication has the advantage that it can be set on a symbol basis.

[0048] However, when performing NR V2X communication, as described above, the current NR slot format only has definitions for uplink, downlink, and flexible symbols. In other words, the current NR slot format does not define symbols for sidelink communication or operations for performing sidelink communication. For this reason, when performing NR V2X communication, it is difficult to use the current NR slot format, which cannot set symbols for sidelink communication, as it is. Therefore, when performing NR V2X communication, it is necessary to define a new slot format (symbol) capable of sidelink communication or to specify a new operation for performing sidelink communication.

[0049] Therefore, in this embodiment, when at least one symbol included in a slot format (Slot configuration) set in a terminal device is a symbol for performing communication other than sidelink communication, the base station transmits information to the terminal device for the terminal device to use at least one symbol as a symbol for performing sidelink communication.

[0050] As a result, in this embodiment, the terminal device can perform sidelink communication using the NR slot format. That is, by using the NR slot format, it is possible to satisfy the requirements of various services in NR V2X communication, thereby achieving high communication performance.

[0051] The above-mentioned "symbols for performing communication other than sidelink communication" are, for example, symbols for performing uplink communication (uplink symbols) and flexible symbols capable of performing uplink communication or downlink communication (flexible symbols), and details of these symbols will be described later.

[0052] The above-mentioned “information for use by the terminal device as a symbol for performing sidelink communication” refers to, for example, information on a slot format in which a symbol for performing sidelink communication is set, or information for using an existing symbol for sidelink communication, the details of which will be described later.

[0053] This embodiment will be described in detail below. <<2. Information Processing System Configuration>> First, an information processing system 1 according to an embodiment of the present disclosure will be described with reference to Fig. 15. Fig. 15 is a diagram illustrating a configuration example of the information processing system 1 according to an embodiment of the present disclosure. The information processing system 1 illustrated in Fig. 15 is a mobile communication system including a plurality of communication devices (mobile devices, terminal devices) capable of sidelink communication.

[0054] The information processing system 1 is, for example, a wireless communication system using a radio access technology (RAT: Radio Access Technology) of New Radio (NR). This wireless communication system is also called 5GS (5th Generation System). In this case, the information processing system 1 is not limited to a mobile phone communication system, and may be, for example, an intelligent transport system (ITS: Intelligent Transport Systems). Note that the information processing system 1 is not limited to a cellular communication system, and may be, for example, another wireless communication system such as a wireless LAN (Local Area Network) system, an aviation wireless system, or a space wireless communication system.

[0055] The information processing system 1 may provide a function for executing application processing (e.g., an edge function) to a mobile device via a wireless network using NR wireless access technology. NR is a type of cellular communication technology, and enables mobile communication of a mobile device by arranging multiple areas covered by base station devices in the form of cells.

[0056] In the following description, NR includes New Radio Access Technology (NRAT) and Further EUTRA (FEUTRA). A single base station may manage multiple cells. A cell that supports NR may be referred to as an NR cell.

[0057] NR is the next generation (5th generation) radio access technology (RAT) after LTE (4th generation communication including LTE-Advanced and LTE-Advanced Pro). NR is a radio access technology that can support various use cases including eMBB (Enhanced Mobile Broadband), mMTC (Massive Machine Type Communications) and URLLC (Ultra-Reliable and Low Latency Communications). NR is being studied with the aim of creating a technical framework that can support the usage scenarios, requirements, and deployment scenarios of these use cases.

[0058] In addition, the NR base station may be referred to as an NGRAN (Next Generation RAN) node. NGRAN refers to a RAN (RAN having a reference point with 5GC) when the core network is 5GC (5G Core). That is, NGRAN may include a gNodeB (gNB) and a ng-eNodeB (ng-eNB). In addition, in NR, a mobile device may be referred to as a UE (User Equipment).

[0059] <2-1. Overall configuration of information processing system> As shown in Fig. 15, the information processing system 1 includes a management device 10, a base station device 20, a base station device 30, a terminal device 40, and a mobile device 50. Fig. 16 is a diagram showing a specific configuration example of the information processing system 1. In addition to the above configuration, the information processing system 1 may include a cloud server device CS, but this need not be a required component.

[0060] A network N1 is configured by these multiple devices that configure the information processing system 1. The network N1 is, for example, a wireless network. For example, the network N1 is a mobile communication network configured using a wireless access technology such as NR. The network N1 is configured by a wireless access network RAN ​​and a core network CN.

[0061] The devices in the figure may be considered as logical nodes, that is, some of the devices in the figure may be realized as virtual machines (VMs), containers, Dockers, etc., and may be implemented on the same physical hardware.

[0062] [Cloud server device] The cloud server device CS is a processing device (e.g., a server device) connected to the network N2. For example, the cloud server device CS is a server host computer that processes requests from a client computer (e.g., a mobile device 50). The cloud server device CS may be a PC server, a midrange server, or a mainframe server. Here, the network N2 is a communication network connected to the network N1 via a gateway device (e.g., UPF, S-GW, or P-GW). That is, the network N2 is a Data Network (DN). In addition, for example, the network N2 is a communication network such as the Internet, a regional IP (Internet Protocol) network, or a telephone network (e.g., a fixed telephone network, a mobile phone network). The cloud server device can be referred to as a server device, a processing device, or an information processing device.

[0063] [Management device] The management device 10 is a device that manages a wireless network. For example, the management device 10 is a device that functions as an AMF (Access and Mobility Management Function). The management device 10, together with a gateway device, constitutes a part of a core network CN. The core network CN is a network owned by a predetermined entity (subject) such as a mobile communication operator. For example, the core network CN is a 5G Core network (5GC). Note that the predetermined entity may be the same as or different from the entity that uses, operates, and / or manages the base station devices 20 and 30.

[0064] In addition, the management device 10 may have a gateway function. For example, if the core network is 5GC, the management device 10 has a function as a UPF (User Plane Function). In addition, the management device 10 may be an SMF, a PCF, a UDM, or the like. Alternatively, the core network CN may include an SMF, a PCF, a UDM, or the like.

[0065] The management device 10 is connected to each of a plurality of base station devices 20 and a plurality of base station devices 30. For example, in the case of 5GS, an N2 reference point exists between the AMF (10) and the NG-RAN (20, 30), and the AMF (10) and the NG-RAN (20, 30) are logically connected to each other via an NG interface. The management device 10 may manage the communication between the base station device 20 and the base station device 30. For example, the management device 10 manages the location of the mobile device 50 in the network N1 for each mobile device 50 in an area unit (e.g., Tracking Area, RAN Notification Area) consisting of a plurality of cells. The management device 10 may grasp and manage for each mobile device 50 which base station device (or which cell) the mobile device 50 is connected to, which base station device (or which cell) the mobile device 50 is present in the communication area of, etc. A cell provided by a base station is called a serving cell. The serving cell includes a PCell (Primary Cell) and a SCell (Secondary Cell). When Dual Connectivity (e.g. EUTRA-EUTRA Dual Connectivity, EUTRA-NR Dual Connectivity (ENDC), EUTRA-NR Dual Connectivity with 5GC, NR-EUTRA Dual Connectivity (NEDC), NR-NR Dual Connectivity) is provided to a UE (e.g. terminal device 40, mobile device 50), the PCell and SCell(s) provided by the MN (Master Node) are referred to as a Master Cell Group. Furthermore, the serving cell may include a PSCell (Primary Secondary Cell or Primary SCG Cell). In other words, when Dual Connectivity is provided to a UE, the PSCell and SCell(s) provided by the SN (Secondary Node) are referred to as a Secondary Cell Group (SCG).One cell may be associated with one Downlink Component Carrier and one Uplink Component Carrier. Furthermore, the system bandwidth corresponding to one cell may be divided into a plurality of Bandwidth Parts. In this case, one or a plurality of Bandwidth Parts may be configured for a UE, and one Bandwidth Part may be used by the UE as an Active BWP. Furthermore, radio resources (e.g., frequency band, numerology (subcarrier spacing), slot format (Slot configuration)) that the mobile device 50 can use may differ for each cell, each component carrier, or each BWP.

[0066] [Base station equipment] The base station device 20 is a wireless communication device that wirelessly communicates with the terminal device 40 and the mobile device 50. The base station device 20 is a device that constitutes a network in V2N communication. The base station device 20 is a type of communication device. As described above, the base station device 20 may be a device equivalent to a wireless base station (Base Station, Node B, eNB, gNB, etc.) or a wireless access point (Access Point). Furthermore or instead, when the base station device is an eNB, gNB, etc., it may be referred to as 3GPP Access. Furthermore or instead, when the base station device is a wireless access point (Access Point), it may be referred to as Non-3GPP Access. Furthermore or instead, the base station device 20 may be a wireless relay station (Relay Node). Furthermore or instead, the base station device 20 may be a radio extension device called RRH (Remote Radio Head). Furthermore or instead, when the base station device is a gNB, the base station device may be referred to as a combination of a gNB CU (Central Unit) and a gNB DU (Distributed Unit) or any of them. The gNB CU (Central Unit) hosts multiple upper layers (e.g. RRC, SDAP, PDCP) of the Access Stratum for communication with the UE. On the other hand, the gNB-DU hosts multiple lower layers (e.g. RLC, MAC, PHY) of the Access Stratum. That is, among the message information described later, RRC signaling may be generated by the gNB CU, while DCI may be generated by the gNB-DU. In this embodiment, the base station of the wireless communication system may be referred to as a base station device. The base station device 20 may be configured to be capable of wireless communication with other base station devices 20 and base station device 30. For example, when the multiple base station devices 20 and 30 are eNBs or a combination of an eNB and a gNB, the devices may be connected to each other via an X2 interface. Additionally or alternatively, when the multiple base station devices 20 and 30 are gNBs or a combination of an eNB and a gNB, the devices may be connected to each other via an Xn interface.Additionally or alternatively, when the multiple base station devices 20, 30 are a combination of a gNB CU (Central Unit) and a gNB DU (Distributed Unit), the devices may be connected to each other via an F1 interface. Message information (RRC signaling or DCI information) described later may be communicated between the multiple base station devices 20, 30 (for example, via an X2, Xn, or F1 interface). The radio access technology used by the base station device 20 may be a cellular communication technology or a wireless LAN technology. Of course, the radio access technology used by the base station device 20 is not limited to these and may be another radio access technology. In addition, the wireless communication used by the base station device 20 may be wireless communication using radio waves or wireless communication using infrared rays or visible light (optical wireless).

[0067] The base station device 30 is a wireless communication device that wirelessly communicates with the terminal device 40 and the mobile device 50. It is a device that constitutes an infrastructure in V2I communication. The base station device 30 is a type of communication device, similar to the base station device 20. The base station device 30 is, for example, a device equivalent to a wireless base station (Base Station, Node B, eNB, gNB, etc.) or a wireless access point. The base station device 30 may be a wireless relay station. The base station device 30 may be a road base station device such as an RSU (Road Side Unit). The base station device 20 may also be a radio extension device called an RRH (Remote Radio Head). The base station device 30 may be configured to be able to wirelessly communicate with other base station devices 30 and the base station device 20. The wireless access technology used by the base station device 30 may be a cellular communication technology or a wireless LAN technology. Of course, the wireless access technology used by the base station device 20 is not limited to these, and may be other wireless access technologies. Moreover, the wireless communication used by the base station device 30 may be wireless communication using radio waves, or may be wireless communication using infrared rays or visible light (optical wireless).

[0068] The base station devices 20 and 30 may be able to communicate with each other via a base station device-core network interface (e.g., NG Interface, S1 Interface, etc.). This interface may be either wired or wireless. The base station devices may be able to communicate with each other via a base station device-to-base station device interface (e.g., Xn Interface, X2 Interface, etc.). This interface may be either wired or wireless.

[0069] The base station devices 20 and 30 may be used, operated, and / or managed by various entities. For example, the entities may be a mobile network operator (MNO), a mobile virtual network operator (MVNO), a mobile virtual network enabler (MVNE), a neutral host network (NHN) operator, an enterprise, an educational institution (a school corporation, a board of education of each local government, etc.), a real estate (building, condominium, etc.) manager, an individual, and the like. Of course, the entities that use, operate, and / or manage the base station devices 20 and 30 are not limited to these. The base station devices 20 and 30 may be installed and / or operated by one business operator, or may be installed and / or operated by one individual. Of course, the entities that install and operate the base station device 20 are not limited to these. For example, the base station devices 20 and 30 may be installed and / or operated jointly by multiple business operators or multiple individuals. Furthermore, the base station devices 20 and 30 may be shared facilities used by multiple businesses or multiple individuals. In this case, the installation and / or operation of the facilities may be performed by a third party other than the users.

[0070] The concept of a base station device (also called a base station) includes not only a donor base station but also a relay base station (also called a relay station or a relay station device). The concept of a base station includes not only a structure having the function of a base station but also a device installed in the structure. The structure is, for example, a high-rise building, a house, a steel tower, a station facility, an airport facility, a port facility, a stadium, and other buildings. The concept of a structure includes not only a building but also a non-building structure such as a tunnel, a bridge, a dam, a fence, and an iron pillar, and equipment such as a crane, a gate, and a windmill. The concept of a structure includes not only a land (ground in the narrow sense) or underground structure but also a water structure such as a pier or a megafloat, and an underwater structure such as an ocean observation facility. The base station device can be rephrased as a processing device or an information processing device.

[0071] The base station devices 20 and 30 may be fixed stations or mobile base station devices (mobile stations). For example, the base station devices 20 and 30 may be devices installed in a mobile body, or may be the mobile body itself. For example, a relay station device having mobility can be regarded as the base station devices 20 and 30 as mobile stations. In addition, devices that are inherently mobile and have the functions of a base station device (at least a part of the functions of a base station device), such as vehicles, drones (Aerial Vehicles), and smartphones, also fall under the category of the base station devices 20 and 30 as mobile stations.

[0072] Here, the moving body may be a mobile terminal such as a smartphone or a mobile phone. The moving body may be a moving body moving on land (ground in the narrow sense) (for example, vehicles such as automobiles, bicycles, buses, trucks, motorcycles, trains, and linear motor cars), or a moving body moving underground (for example, in a tunnel) (for example, a subway). The moving body may be a moving body moving on water (for example, ships such as passenger ships, cargo ships, and hovercraft), or a moving body moving underwater (for example, submersible vessels such as submarines, submarines, and unmanned submersible vehicles). The moving body may be a moving body moving within the atmosphere (for example, aircraft (aerial vehicles) such as airplanes, airships, and drones), or a moving body moving outside the atmosphere (for example, artificial celestial bodies such as artificial satellites, spaceships, space stations, and probes).

[0073] The base station devices 20 and 30 may be terrestrial base station devices (terrestrial station devices) installed on the ground. For example, the base station devices 20 and 30 may be base station devices arranged on a structure on the ground, or may be base station devices installed on a mobile body moving on the ground. More specifically, the base station devices 20 and 30 may be an antenna installed on a structure such as a building and a signal processing device connected to the antenna. Of course, the base station devices 20 and 30 may be the structure or the mobile body itself. The term "terrestrial" refers not only to land (terrestrial in the narrow sense) but also to ground, on water, and underwater in a broad sense. The base station devices 20 and 30 are not limited to terrestrial base station devices. The base station devices 20 and 30 may be non-terrestrial base station devices (non-terrestrial station devices) that can float in the air or space. For example, the base station devices 20 and 30 may be aircraft station devices or satellite station devices.

[0074] The aircraft station device is a wireless communication device capable of floating in the atmosphere (including the stratosphere), such as an aircraft. The aircraft station device may be a device mounted on an aircraft, or may be the aircraft itself. The concept of an aircraft includes not only heavier aircraft such as airplanes and gliders, but also lighter aircraft such as balloons and airships. The concept of an aircraft includes not only heavier aircraft and lighter aircraft, but also rotorcraft such as helicopters and autogyros. The aircraft station device (or the aircraft on which the aircraft station device is mounted) may be an unmanned aircraft such as a drone. The concept of an unmanned aircraft also includes unmanned aerial systems (UAS) and tethered unmanned aerial systems (tethered UAS). The concept of an unmanned aircraft also includes lighter than air UAS (LTA) and heavier than air UAS (HTA). The concept of an unmanned aircraft also includes high altitude unmanned aerial system platforms (HAPs).

[0075] The satellite station device is a wireless communication device capable of floating outside the atmosphere. The satellite station device may be a device mounted on a space vehicle such as an artificial satellite, or may be the space vehicle itself. A satellite serving as the satellite station device may be any 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. Of course, the satellite station device may be a device mounted on a low earth orbit satellite, a medium earth orbit satellite, a geostationary satellite, or a highly elliptical orbit satellite.

[0076] The size of the coverage of the base station devices 20 and 30 may be as large as a macrocell or as small as a picocell. Of course, the size of the coverage of the base station devices 20 and 30 may be extremely small, such as a femtocell. The base station devices 20 and 30 may also have a beamforming capability. In this case, the base station devices 20 and 30 may form a cell or a service area for each beam.

[0077] [Terminal devices and mobile devices] The terminal device 40 is a wireless communication device that wirelessly communicates with the base station device 20 or the base station device 30. The terminal device 40 is, for example, a mobile phone, a smart device (smartphone or tablet), a PDA (Personal Digital Assistant), or a personal computer. The mobile device 50 may be a M2M (Machine to Machine) device or an IoT (Internet of Things) device (for example, it may be called an MTC UE, an NB-IoT UE, or a Cat. M UE). The terminal device 40 is capable of sidelink communication with the mobile device 50 and other terminal devices 40. Note that the wireless communication (including sidelink communication) used by the terminal device 40 may be wireless communication using radio waves, or may be wireless communication using infrared rays or visible light (optical wireless).

[0078] The mobile device 50 is a base station device 20 or a mobile wireless communication device that wirelessly communicates with the base station device 20. The mobile device 50 may be a wireless communication device installed in a mobile device, or may be the mobile device itself. For example, the mobile device 50 may be a vehicle that moves on a road, such as an automobile, a bus, a truck, or a motorcycle, or a wireless communication device mounted on the vehicle. The mobile device 50 is capable of sidelink communication with the terminal device 40 and other mobile devices 50. The mobile device 50 can use an automatic repeat technique such as HARQ when performing sidelink communication. Note that the wireless communication (including sidelink communication) used by the mobile device 50 may be wireless communication using radio waves, or wireless communication using infrared rays or visible light (optical wireless).

[0079] The "mobile device" is a type of communication device, and is also called a mobile station, a mobile station device, a terminal device, or a terminal. The concept of the "mobile device" includes not only a communication device configured to be movable, but also a mobile device in which a communication device is installed. In this case, the mobile device may be a mobile terminal, or a mobile device that moves on land (ground in the narrow sense), underground, on water, or underwater. The mobile device may be a mobile device that moves within the atmosphere, such as a drone (aerial UE) or a helicopter, or a mobile device that moves outside the atmosphere, such as an artificial satellite.

[0080] 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 structures and mobile bodies. The structures and mobile bodies themselves may be considered as communication devices. Furthermore, the concept of a communication device includes not only mobile devices (terminal devices, automobiles, etc.) but also base station devices (donor base stations, relay base stations, etc.). A communication device is a type of processing device and information processing device.

[0081] The mobile device 50 and the terminal device 40 are connected to the base station devices 20 and 30 by wireless communication (e.g., radio waves or optical wireless). When the mobile device 50 moves from the communication area (or cell) of one base station device to the communication area (or cell) of another base station device, a handover (or handoff) or cell selection (reselection) is performed.

[0082] The mobile device 50 and the terminal device 40 may simultaneously connect to a plurality of base station devices or a plurality of cells to perform communication. For example, when one base station device can provide a plurality of cells, the mobile device 50 or the terminal device 40 can perform carrier aggregation by using a certain cell as a PCell and another cell as a SCell. In addition, or instead of this, when a plurality of base station devices can provide one or more cells, the mobile device 50 or the terminal device 40 can perform DC by using one or more cells managed by one base station device (MN (e.g. MeNB or MgNB)) as a PCell or a PCell and an SCell(s) and using one or more cells managed by the other base station device (SN (e.g. SeNB or SgNB)) as a PSCell or a PSCell and an SCell(s). DC may be referred to as MC (Multi Connectivity). Alternatively, it is also possible for the mobile device 50 and the terminal device 40 to communicate with the multiple base station devices using coordinated multi-point transmission and reception (CoMP) technology via cells of different base station devices (multiple cells having different cell identifiers or the same cell identifier).

[0083] The mobile device 50 and the terminal device 40 do not necessarily have to be devices that are directly used by people. The mobile device 50 and the terminal device 400 may be sensors installed on factory machines, such as so-called MTC (Machine Type Communication). The mobile device 50 may be an M2M (Machine to Machine) device or an IoT (Internet of Things) device. The mobile device 50 and the terminal device 40 may be devices equipped with a relay communication function, such as D2D (Device to Device) and V2X (Vehicle to everything). The mobile device 50 and the terminal device 40 may be devices called CPE (Client Premises Equipment) used in wireless backhaul, etc.

[0084] The configuration of each device constituting the information processing system 1 according to this embodiment will be specifically described below.

[0085] <2-2. Management device configuration> The management device 10 is a device that manages a wireless network. For example, the management device 10 is a device that manages communication between the base station devices 20 and 30. If the core network CN is 5GC, the management device 10 may be a device having a function such as an AMF, an SMF, or a UPF. The management device 10 may have an execution function (for example, an edge function) of application processing and function as a server device such as an application server. More specifically, when a UPF is placed in a local area network (i.e., when the UPF is a Local UPF), a device for edge computing may be placed in a DN having an N6 reference point between the UPF and the DN. The device for edge computing may be included in the management device 10. The device for edge computing may operate as (for example, a Multi access Edge Computing (MEC) Platform, an MEC host, or an MEC application.

[0086] Fig. 17 is a diagram showing a configuration example of a management device 10 according to an embodiment of the present disclosure. The management device 10 includes a network communication unit 11, a storage unit 12, and a control unit 13. Note that the configuration shown in Fig. 17 is a functional configuration, and the hardware configuration may be different from this. In addition, the functions of the management device 10 may be distributed and implemented in multiple physically separated configurations. For example, the management device 10 may be configured by multiple server devices.

[0087] The network communication unit 11 is a communication interface for communicating with other devices. The network communication unit 11 may be a network interface or a device connection interface. The network communication unit 11 has a function of directly or indirectly connecting to the network N1. For example, the network communication unit 11 may have a LAN (Local Area Network) interface such as a NIC (Network Interface Card), or a USB (Universal Serial Bus) interface configured by a USB host controller, a USB port, etc. In addition, the network communication unit 11 may be a wired interface or a wireless interface. The network communication unit 11 functions as a communication means of the management device 10. The network communication unit 11 communicates with the base station devices 20 and 30 according to the control of the control unit 13.

[0088] The storage unit 12 is a data readable / writable storage device such as a dynamic random access memory (DRAM), a static random access memory (SRAM), a flash memory, or a hard disk. The storage unit 12 functions as a storage means of the management device 10. The storage unit 12 stores, for example, the connection state of the mobile device 50. For example, the storage unit 12 stores the state of the radio resource control (RRC) and the state of the EPS connection management (ECM) of the mobile device 50. The storage unit 12 may function as a home memory that stores location information of the mobile device 50.

[0089] The control unit 13 is a controller that controls each part of the management device 10. The control unit 13 is realized by a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). For example, the control unit 13 is realized by the processor executing various programs stored in a storage device inside the management device 10 using a RAM (Random Access Memory) or the like as a working area. The control unit 13 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The CPU, MPU, ASIC, and FPGA can all be considered as controllers.

[0090] <2-3. Base Station Equipment (Network) Configuration> Next, the configuration of the base station device 20 will be described. The base station device 20 is a wireless communication device that wirelessly communicates with the mobile device 50. The base station device 20 is a device that functions as, for example, a wireless base station, a wireless relay station, a wireless access point, or the like. In this case, the base station device 20 may be a radio extension device such as an RRH. As described above, the base station device 20 is a device that constitutes a network in V2N communication.

[0091] 18A and 18B are diagrams showing a configuration example of a base station device 20 according to an embodiment of the present disclosure. As shown in FIG. 18A, the base station device 20 includes a wireless communication unit 21, a storage unit 22, a network communication unit 23, and a control unit 24. Note that the configuration shown in FIG. 18A is a functional configuration, and the hardware configuration may be different from this. In addition, the functions of the base station device 20 may be distributed and implemented in multiple physically separated components. A detailed configuration of the base station device 20 shown in FIG. 18A is shown in FIG. 18B.

[0092] The wireless communication unit 21 is a wireless communication interface that wirelessly communicates with other wireless communication devices (e.g., a mobile device 50, a base station device 30, another base station device 20). The wireless communication unit 21 operates under the control of the control unit 24. The wireless communication unit 21 may be compatible with a plurality of wireless access methods. For example, the wireless communication unit 21 may be compatible with both NR and LTE. The wireless communication unit 21 may be compatible with W-CDMA and cdma2000 in addition to LTE. Of course, the wireless communication unit 21 may be compatible with wireless access methods other than NR, LTE, W-CDMA, and cdma2000.

[0093] The wireless communication unit 21 includes a reception processing unit 211, a transmission processing unit 212, and an antenna 213. The wireless communication unit 21 may include a plurality of reception processing units 211, a transmission processing unit 212, and an antenna 213. When the wireless communication unit 21 supports a plurality of wireless access methods, each unit of the wireless communication unit 21 may be configured separately for each wireless access method. For example, the reception processing unit 211 and the transmission processing unit 212 may be configured separately for LTE and NR.

[0094] The reception processing unit 211 processes an uplink signal received via the antenna 213. The reception processing unit 211 includes a radio reception unit 211a, a demultiplexing unit 211b, a demodulation unit 211c, and a decoding unit 211d.

[0095] The radio receiving unit 211a performs down-conversion, removal of unnecessary frequency components, control of amplification level, orthogonal demodulation, conversion to digital signal, removal of guard interval, extraction of frequency domain signal by fast Fourier transform, etc., on the uplink signal. The demultiplexing unit 211b separates uplink channels such as PUSCH (Physical Uplink Shared Channel) and PUCCH (Physical Uplink Control Channel) and uplink reference signals from the signal output from the radio receiving unit 211a. The demodulating unit 211c demodulates the received signal using a modulation method such as BPSK (Binary Phase Shift Keying) and QPSK (Quadrature Phase Shift Keying) for the modulation symbols of the uplink channel. The modulation method used by the demodulating unit 211c may be 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM. The decoding unit 211d performs decoding processing on the coded bits of the demodulated uplink channel. The decoded uplink data and uplink control information are output to the control unit 24.

[0096] The transmission processing unit 212 performs a transmission process of the downlink control information and the downlink data, and includes an encoding unit 212a, a modulation unit 212b, a multiplexing unit 212c, and a radio transmission unit 212d.

[0097] The coding unit 212a codes the downlink control information and downlink data input from the control unit 24 using a coding method such as block coding, convolution coding, turbo coding, etc. In the case of NR, the coding unit 212a may code using polar coding or low density parity check (LDPC) coding. The modulation unit 212b modulates the coded bits output from the coding unit 212a using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. The multiplexing unit 212c multiplexes the modulation symbols of each channel and the downlink reference signal, and places the multiplexed symbols in a predetermined resource element. The wireless transmission unit 212d performs various signal processing on the signal from the multiplexing unit 212c. For example, the wireless transmission unit 212d performs processing such as conversion to the time domain by fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, quadrature modulation, up-conversion, removal of unnecessary frequency components, and power amplification. The signal generated by the transmission processing unit 212 is transmitted from an antenna 213 .

[0098] The storage unit 22 is a data readable / writable storage device such as a DRAM, an SRAM, a flash memory, a hard disk, etc. The storage unit 22 functions as a storage unit of the base station device 20.

[0099] The network communication unit 23 is a communication interface for communicating with other devices (e.g., the management device 10, other base station devices 20, base station device 30, cloud server device CS, etc.). The network communication unit 23 has a function of directly or indirectly connecting to the network N1. For example, the network communication unit 23 has a LAN interface such as a NIC. Furthermore, the network communication unit 23 may be a wired interface or a wireless interface. The network communication unit 23 functions as a network communication means of the base station device 20. The network communication unit 23 communicates with other devices (e.g., the management device 10, cloud server device CS, etc.) according to the control of the control unit 24. The configuration of the network communication unit 23 may be the same as that of the network communication unit 11 of the management device 10.

[0100] The control unit 24 is a controller that controls each unit of the base station device 20. The control unit 24 is realized by a processor (hardware processor) such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). For example, the control unit 24 is realized by the processor executing various programs stored in a storage device inside the base station device 20 using a RAM (Random Access Memory) or the like as a working area. The control unit 24 may be realized by an integrated circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). Any of the CPU, MPU, ASIC, and FPGA can be considered as a controller.

[0101] The control unit 24 may be configured by dividing it into a plurality of functional blocks each representing a function of the control unit 24. The functional blocks of the control unit 24 may be software blocks or hardware blocks. For example, each of the above-mentioned functional blocks may be a single software module realized by software (including a microprogram), or may be a single circuit block on a semiconductor chip (die). Of course, each functional block may be a single processor or a single integrated circuit. The functional blocks may be configured in any manner. The operation of the control unit 24 will be described in detail later.

[0102] <2-4. Base Station Equipment (Infrastructure) Configuration> Next, the configuration of the base station device 30 will be described. The base station device 30 is a wireless communication device that wirelessly communicates with the mobile device 50. The base station device 30 is a device that functions as, for example, a wireless base station, a wireless relay station, a wireless access point, or the like. In this case, the base station device 30 may be a road base station device such as an RSU, or a radio extension device such as an RRH. As described above, the base station device 30 is a device that constitutes the infrastructure in V2I communication.

[0103] Fig. 19 is a diagram showing a configuration example of a base station device 30 according to an embodiment of the present disclosure. The base station device 30 includes a wireless communication unit 31, a storage unit 32, a network communication unit 33, and a control unit 34. Note that the configuration shown in Fig. 19 is a functional configuration, and the hardware configuration may be different from this. In addition, the functions of the base station device 30 may be distributed and implemented in multiple physically separated configurations.

[0104] The wireless communication unit 31 is a wireless communication interface that wirelessly communicates with other wireless communication devices (e.g., a mobile device 50, a base station device 20, another base station device 30). The wireless communication unit 31 operates under the control of the control unit 34. The wireless communication unit 31 includes a reception processing unit 311, a transmission processing unit 312, and an antenna 313. The configuration of the wireless communication unit 31 (the reception processing unit 311, the transmission processing unit 312, and the antenna 313) is similar to that of the wireless communication unit 21 of the base station device 20 (the reception processing unit 211, the transmission processing unit 212, and the antenna 213).

[0105] The storage unit 32 is a data readable / writable storage device such as a DRAM, an SRAM, a flash memory, a hard disk, etc. The storage unit 32 functions as a storage means of the base station device 30. The configuration of the storage unit 32 is similar to that of the storage unit 22 of the base station device 20.

[0106] The network communication unit 33 is a communication interface for communicating with other devices (e.g., the management device 10, the base station device 20, other base station devices 30, the cloud server device CS, etc.). The network communication unit 33 has a function of directly or indirectly connecting to the network N1. For example, the network communication unit 33 has a LAN interface such as a NIC. The network communication unit 33 may be a wired interface or a wireless interface. The network communication unit 33 functions as a network communication means of the base station device 30. The configuration of the network communication unit 33 is similar to that of the network communication unit 23 of the base station device 20.

[0107] The control unit 34 is a controller that controls each unit of the base station device 30. The control unit 34 is realized by a processor such as a CPU or an MPU. For example, the control unit 34 is realized by a processor executing various programs stored in a storage device inside the base station device 30 using a RAM or the like as a working area. The control unit 34 may be realized by an integrated circuit such as an ASIC or an FPGA. The CPU, the MPU, the ASIC, and the FPGA can all be considered as controllers.

[0108] The control unit 34 may be configured by dividing it into a plurality of functional blocks each representing a function of the control unit 34. The functional blocks of the control unit 34 may be software blocks or hardware blocks. For example, each of the above-mentioned functional blocks may be a single software module realized by software (including a microprogram), or may be a single circuit block on a semiconductor chip (die). Of course, each functional block may be a single processor or a single integrated circuit. The functional blocks may be configured in any manner. The operation of the control unit 34 will be described in detail later. The operation of the control unit 34 may be the same as that of the above-mentioned control unit 24.

[0109] <2-5. Terminal device configuration> Next, the configuration of the terminal device 40 will be described. The terminal device 40 is a mobile wireless communication device. For example, the terminal device 40 may be a user terminal (UE: User Equipment) such as a mobile phone or a smart device. The terminal device 40 is capable of wireless communication with the base station device 20 and the base station device 30. The terminal device 40 is also capable of side link communication with a mobile device 50 and other terminal devices 40.

[0110] FIG. 20 is a diagram showing a configuration example of a 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, a network communication unit 43, an input / output unit 44, and a control unit 45. Note that the configuration shown in FIG. 20 is a functional configuration, and the hardware configuration may be different from this. In addition, the functions of the terminal device 40 may be distributed and implemented in multiple physically separated configurations. Furthermore, in the configuration of the terminal device 40, the network communication unit 53 and the input / output unit 44 may not be essential components.

[0111] The wireless communication unit 41 is a wireless communication interface that wirelessly communicates with other wireless communication devices (e.g., base station device 20 and base station device 30). The wireless communication unit 41 operates under the control of the control unit 45. The wireless communication unit 41 supports one or more wireless access methods. For example, the wireless communication unit 41 supports both NR and LTE. The wireless communication unit 41 may support W-CDMA and cdma2000 in addition to NR and LTE. The wireless communication unit 21 may also support communication using NOMA.

[0112] The wireless communication unit 41 includes a reception processing unit 411, a transmission processing unit 412, and an antenna 413. The wireless communication unit 41 may include a plurality of reception processing units 411, a transmission processing unit 412, and an antenna 413. When the wireless communication unit 41 supports a plurality of wireless access methods, each unit of the wireless communication unit 41 may be configured separately for each wireless access method. For example, the reception processing unit 411 and the transmission processing unit 412 may be configured separately for LTE and NR.

[0113] The reception processing unit 411 processes a downlink signal received via the antenna 413. The reception processing unit 411 includes a radio reception unit 411a, a demultiplexing unit 411b, a demodulation unit 411c, and a decoding unit 411d.

[0114] The wireless receiver 411a performs down-conversion, removal of unnecessary frequency components, control of amplification level, orthogonal demodulation, conversion to digital signal, removal of guard interval, extraction of frequency domain signal by fast Fourier transform, etc., on the downlink signal. The demultiplexer 411b separates the downlink channel, the downlink synchronization signal, and the downlink reference signal from the signal output from the wireless receiver 411a. The downlink channel is, for example, a channel such as PBCH (Physical Broadcast Channel), PDSCH (Physical Downlink Shared Channel), or PDCCH (Physical Downlink Control Channel). The demodulator 211c demodulates the received signal using a modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM for the modulation symbols of the downlink channel. The decoder 411d performs decoding processing on the coded bits of the demodulated downlink channel. The decoded downlink data and downlink control information are output to the controller 45. The downlink synchronization signal may include an SSB (SS / PBCH Block). The downlink reference signal may include a CSI-RS and a DMRS.

[0115] The transmission processing unit 412 performs a transmission process of the uplink control information and the uplink data. The transmission processing unit 412 includes an encoding unit 412a, a modulation unit 412b, a multiplexing unit 412c, and a radio transmission unit 412d.

[0116] The coding unit 412a codes the uplink control information and uplink data input from the control unit 45 using a coding method such as block coding, convolution coding, turbo coding, etc. In the case of NR, the coding unit 412a may code using polar coding or low density parity check (LDPC) coding. The modulation unit 412b modulates the coded bits output from the coding unit 412a using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. The multiplexing unit 412c multiplexes the modulation symbols of each channel and the uplink reference signal, and places the multiplexed symbols in a predetermined resource element. The wireless transmission unit 412d performs various signal processing on the signal from the multiplexing unit 412c. For example, the wireless transmission unit 412d performs processing such as conversion to the time domain by inverse fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, quadrature modulation, up-conversion, removal of unnecessary frequency components, and power amplification. The signal generated by the transmission processing unit 412 is transmitted from an antenna 413 .

[0117] The storage unit 42 is a data readable / writable storage device such as a DRAM, an SRAM, a flash memory, a hard disk, etc. The storage unit 42 functions as a storage unit of the terminal device 40.

[0118] The network communication unit 43 is a communication interface for communicating with other devices. For example, the network communication unit 43 is a LAN interface such as a NIC. The network communication unit 43 has a function of directly or indirectly connecting to the network N1. The network communication unit 43 may be a wired interface or a wireless interface. The network communication unit 43 functions as a network communication means of the terminal device 40. The network communication unit 43 communicates with other devices according to the control of the control unit 45.

[0119] The input / output unit 44 is a user interface for exchanging information with the user. For example, the input / output unit 44 is an operation device such as a keyboard, a mouse, an operation key, or a touch panel that allows the user to perform various operations. Alternatively, the input / output unit 44 is a display device such as a liquid crystal display (LCD) or an organic electroluminescence display (OLED). The input / output unit 44 may be an audio device such as a speaker or a buzzer. The input / output unit 44 may also be a lighting device such as an LED (Light Emitting Diode) lamp. The input / output unit 44 functions as an input / output means (input means, output means, operation means, or notification means) of the terminal device 40.

[0120] The control unit 45 is a controller that controls each unit of the terminal device 40. The control unit 45 is realized by a processor such as a CPU or an MPU. For example, the control unit 45 is realized by the processor executing various programs stored in a storage device inside the terminal device 40 using a RAM or the like as a working area. The control unit 45 may be realized by an integrated circuit such as an ASIC or an FPGA. The CPU, the MPU, the ASIC, and the FPGA can all be considered as controllers.

[0121] The control unit 45 may be configured by dividing it into a plurality of functional blocks each representing a function of the control unit 45. The functional blocks of the control unit 45 may be software blocks or hardware blocks. For example, each of the above-mentioned functional blocks may be a single software module realized by software (including a microprogram), or may be a single circuit block on a semiconductor chip (die). Of course, each functional block may be a single processor or a single integrated circuit. The functional blocks may be configured in any manner. The operation of the control unit 45 will be described in detail later.

[0122] <2-6. Configuration of mobile device> Next, the configuration of the mobile device 50 will be described. The mobile device 50 is a mobile wireless communication device. For example, the mobile device 50 is a vehicle such as an automobile, or a wireless communication device mounted on the vehicle. The mobile device 50 may be a mobile terminal device such as a mobile phone or a smart device. The mobile device 50 is capable of wireless communication with the base station device 20 and the base station device 30. The mobile device 50 is also capable of side link communication with the terminal device 40 and other mobile devices 50.

[0123] Fig. 21 is a diagram showing a configuration example of a mobile device 50 according to an embodiment of the present disclosure. The mobile device 50 includes a wireless communication unit 51, a storage unit 52, a network communication unit 53, an input / output unit 54, and a control unit 55. Note that the configuration shown in Fig. 21 is a functional configuration, and the hardware configuration may be different from this. Furthermore, the functions of the mobile device 50 may be distributed and implemented in multiple physically separated components.

[0124] The wireless communication unit 51 is a wireless communication interface that wirelessly communicates with other wireless communication devices (e.g., base station device 20 and base station device 30). The wireless communication unit 51 operates under the control of the control unit 55. The wireless communication unit 51 supports one or more wireless access methods. For example, the wireless communication unit 51 supports both NR and LTE. The wireless communication unit 51 may support W-CDMA and cdma2000 in addition to LTE. The wireless communication unit 21 also supports communication using NOMA.

[0125] The wireless communication unit 51 includes a reception processing unit 511, a transmission processing unit 512, and an antenna 513. The wireless communication unit 51 may include a plurality of reception processing units 511, a transmission processing unit 512, and an antenna 513. When the wireless communication unit 51 supports a plurality of wireless access methods, each unit of the wireless communication unit 51 may be configured separately for each wireless access method. For example, the reception processing unit 511 and the transmission processing unit 512 may be configured separately for LTE and NR.

[0126] The reception processing unit 511 processes a downlink signal received via the antenna 513. The reception processing unit 511 includes a radio reception unit 511a, a demultiplexing unit 511b, a demodulation unit 511c, and a decoding unit 511d.

[0127] The wireless receiver 511a performs down-conversion, removal of unnecessary frequency components, control of amplification level, orthogonal demodulation, conversion to digital signal, removal of guard interval, extraction of frequency domain signal by fast Fourier transform, etc., on the downlink signal. The demultiplexer 511b separates the downlink channel, the downlink synchronization signal, and the downlink reference signal from the signal output from the wireless receiver 511a. The downlink channel is, for example, a channel such as PBCH, PDSCH, or PDCCH. The demodulator 211c demodulates the received signal using a modulation method such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM for the modulation symbols of the downlink channel. The decoder 511d performs decoding processing on the coded bits of the demodulated downlink channel. The decoded downlink data and downlink control information are output to the controller 55.

[0128] The transmission processing unit 512 performs a transmission process of the uplink control information and the uplink data. The transmission processing unit 512 includes an encoding unit 512a, a modulation unit 512b, a multiplexing unit 512c, and a radio transmission unit 512d.

[0129] The coding unit 512a codes the uplink control information and uplink data input from the control unit 55 using a coding method such as block coding, convolution coding, turbo coding, etc. The modulation unit 512b modulates the coded bits output from the coding unit 512a using a predetermined modulation method such as BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. The multiplexing unit 512c multiplexes the modulation symbols of each channel and the uplink reference signal, and places them in a predetermined resource element. The wireless transmission unit 512d performs various signal processing on the signal from the multiplexing unit 512c. For example, the wireless transmission unit 512d performs processing such as conversion to the time domain by inverse fast Fourier transform, addition of a guard interval, generation of a baseband digital signal, conversion to an analog signal, quadrature modulation, up-conversion, removal of unnecessary frequency components, and power amplification. The signal generated by the transmission processing unit 512 is transmitted from the antenna 513.

[0130] The storage unit 52 is a data readable / writable storage device such as a DRAM, an SRAM, a flash memory, a hard disk, etc. The storage unit 52 functions as a storage means of the mobile device 50.

[0131] The network communication unit 53 is a communication interface for communicating with other devices. For example, the network communication unit 53 is a LAN interface such as a NIC. The network communication unit 53 has a function of directly or indirectly connecting to the network N1. The network communication unit 53 may be a wired interface or a wireless interface. The network communication unit 53 functions as a network communication means of the mobile device 50. The network communication unit 53 communicates with other devices according to the control of the control unit 55. Note that the network communication unit 53 may not be a required component in the configuration of the terminal device 40.

[0132] The input / output unit 54 is a user interface for exchanging information with the user. For example, the input / output unit 54 is an operation device such as a keyboard, a mouse, an operation key, or a touch panel that allows the user to perform various operations. Alternatively, the input / output unit 54 is a display device such as a liquid crystal display or an organic EL display. The input / output unit 54 may be an audio device such as a speaker or a buzzer. The input / output unit 54 may also be a lighting device such as an LED lamp. The input / output unit 54 functions as an input / output means (input means, output means, operation means, or notification means) of the mobile device 50. Note that the input / output unit 54 may not be an essential component in the configuration of the terminal device 40.

[0133] The control unit 55 is a controller that controls each unit of the mobile device 50. The control unit 55 is realized by a processor (hardware processor) such as a CPU or an MPU. For example, the control unit 55 is realized by the processor executing various programs stored in a storage device inside the mobile device 50 using a RAM or the like as a working area. The control unit 55 may be realized by an integrated circuit such as an ASIC or an FPGA. The CPU, MPU, ASIC, and FPGA can all be considered as controllers.

[0134] The control unit 55 may be configured by dividing it into a plurality of functional blocks each representing a function of the control unit 24. The functional blocks of the control unit 55 may be software blocks or hardware blocks. For example, each of the above-mentioned functional blocks may be a single software module realized by software (including a microprogram), or may be a single circuit block on a semiconductor chip (die). Of course, each functional block may be a single processor or a single integrated circuit. The functional blocks may be configured in any manner. The operation of the control unit 55 will be described in detail later.

[0135] The mobile device 50 may have a moving function. For example, the mobile device 50 may have a power unit such as an engine and be capable of moving by its own power. The mobile device 50 does not necessarily have to have a moving function. In this case, the mobile device 50 may be a device that is retrofitted to a device with a moving function (for example, a vehicle such as an automobile). For example, the mobile device 50 may be a navigation system device that is retrofitted to an automobile.

[0136] <<3. Operation of the information processing system>> Next, an example of the operation of the information processing system according to this embodiment will be described. Note that the "base station" shown below is a base station equipped with the above-mentioned base station device 20 or base station device 30. Also, the "terminal device" shown below is the above-mentioned terminal device 40 or mobile device 50. That is, the operation of the base station shown below is the operation of the control unit 24 included in the base station device 20 or the operation of the control unit 34 included in the base station device 30. Also, the operation of the terminal device shown below is the operation of the control unit 45 included in the terminal device 40 or the operation of the control unit 55 included in the mobile device 50.

[0137] In this embodiment, the following (1) to (3) are newly established so that a terminal device performs sidelink communication using the NR slot format. The details of these (1) to (3) will be described in order. (1) New slot format design (2) How to set the slot format (3) How to change the slot format (rewrite symbols)

[0138] <3-1.(1) New design of slot format> In this embodiment, in NR V2X communication, the base station newly designs a slot format for performing sidelink communication. Specifically, the base station newly designs the slot format according to the methods shown in (1A) and (1B) below. (1A) How to define new symbols for sidelink communication (1B) Method of using existing symbols for sidelink communication

[0139] [1A: How to define new symbols for sidelink communication] By defining a new symbol for sidelink communication, the base station can set four states for each symbol in the slot format: a symbol for uplink communication (uplink symbol), a symbol for downlink communication (downlink symbol), a symbol for flexible use (flexible symbol), and a symbol for sidelink communication (sidelink symbol). Note that when setting a new symbol for sidelink communication, it can be set in the following three ways. (1A-1) Symbols that can only carry out sidelink communication (1A-2) Symbol for selectively implementing sidelink communication or uplink communication (1A-3) Symbol capable of simultaneously carrying out sidelink and uplink communications

[0140] [1A-1: Symbol for sidelink communication only] First, a method of newly defining a symbol that can only perform sidelink communication will be described. FIG. 22 is a diagram showing an example of a slot format including a symbol for performing sidelink communication. In the slot format shown in FIG. 22, the first to fourth symbols are downlink symbols (D) and the fifth to seventh symbols are sidelink symbols (S). When the slot format shown in FIG. 22 is used, the terminal device performs downlink communication in the first to fourth symbols in the slot and performs sidelink communication in the fifth to seventh symbols. That is, in the case of the slot format shown in FIG. 22, only sidelink communication can be performed in the fifth to seventh symbols, and downlink communication and uplink communication cannot be performed.

[0141] [1A-2: Symbol for selectively implementing sidelink or uplink communication] Secondly, a method of defining symbols that can selectively perform sidelink communication or uplink communication will be described. FIG. 23 is a diagram showing an example of a slot format including symbols for performing sidelink communication. In the slot format shown in FIG. 23, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols (U) or sidelink symbols (S). When the slot format shown in FIG. 23 is used, the terminal device performs downlink communication with the first to fourth symbols in the slot, and performs uplink communication or sidelink communication with the fifth to seventh symbols. That is, in the case of the slot format shown in FIG. 23, it is possible to select whether to use the fifth to seventh symbols for uplink communication or sidelink communication for each symbol. The selection of whether to use the symbols for uplink communication or sidelink communication may be specified by the base station, or may be determined and selected by the terminal device. The fifth to seventh symbols shown in FIG. 23 cannot be used for downlink communication.

[0142] [1A-3: Symbol for simultaneous sidelink and uplink communication] Thirdly, a method of defining symbols that can simultaneously perform sidelink communication and uplink communication will be described. FIG. 24 is a diagram showing an example of a slot format including symbols for performing sidelink communication. In the slot format shown in FIG. 24, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols (U) and sidelink symbols (S). When the slot format shown in FIG. 24 is used, the terminal device performs downlink communication in the first to fourth symbols in the slot, and simultaneously performs uplink communication and sidelink communication in the fifth to seventh symbols. Note that, in the fifth to seventh symbols, the uplink communication and the sidelink communication may be set to different resource elements (i.e., different subcarriers) or may be set to the same resource element. When the uplink communication and the sidelink communication are set to the same resource element, for example, code multiplexing (CDMA: Code Division Multiple Access, IDMA: “Interleave Division Multiple Access”) or spatial multiplexing may be performed. Note that the fifth to seventh symbols shown in FIG. 24 cannot be used for downlink communication.

[0143] The slot formats described in (1A-1) to (1A-3) are merely examples. For example, a slot format may include all the symbols newly defined in (1A-1) to (1A-3). In other words, the same slot may include a symbol (S) dedicated to sidelink communication, a symbol (U / S) for selecting uplink communication or sidelink communication, and a symbol (U and S) for simultaneously performing uplink communication and sidelink communication.

[0144] [1B: How to use existing symbols for sidelink communication] Next, a method of using an existing symbol for sidelink communication will be described. That is, in the above (1A), a new symbol for sidelink communication is defined, but in (1B), a new symbol for sidelink communication is not defined. There are two methods for using an existing symbol for sidelink communication: (1B-1) Using symbols for uplink communication for sidelink communication (1B-2) Use of flexible symbols for sidelink communications

[0145] [1B-1: Use symbols for uplink communication for sidelink communication] First, a case where symbols for uplink communication are used for sidelink communication will be described. FIG. 25 is a diagram showing an example of a slot format including symbols for implementing sidelink communication. In the slot format shown in FIG. 25, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols ("(U)") capable of sidelink communication. When the slot format shown in FIG. 25 is used, the terminal device performs downlink communication using the first to fourth symbols in the slot, and performs any one of the following communications (a) to (c) using the fifth to seventh symbols. (a) Sidelink communication (b) Uplink communication (c) Simultaneous sidelink and uplink communication

[0146] The base station notifies the terminal device which of the above communication methods (a) to (c) the terminal device will perform, and a specific example of this notification will be described later.

[0147] [1B-2: Use of flexible symbols for sidelink communications] Secondly, a case where flexible symbols are used for sidelink communication will be described. FIG. 26 is a diagram showing an example of a slot format including symbols for implementing sidelink communication. In the slot format shown in FIG. 26, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are flexible symbols ("(F)") capable of sidelink communication. When the slot format shown in FIG. 26 is used, the terminal device performs downlink communication using the first to fourth symbols in the slot, and performs any one of the following communications (a) to (d) using the fifth to seventh symbols. (a) Sidelink communication (b) Uplink communication (c) Downlink communication (d) Simultaneous sidelink and uplink communications

[0148] The base station notifies the terminal device which of the above communication methods (a) to (d) will be performed, and a specific example of this notification will be described later.

[0149] <3-2.(2) Slot format setting method (Slot configuration)> [How to set the slot format] Next, a method for setting the slot format will be described. The slot format is set from the base station to the terminal device. There are two methods for setting the slot format: (2A) How to set per cell (from the base station perspective) (2B) How to set up for each device

[0150] [2A: How to set for each cell] First, a method of setting for each cell (from the viewpoint of the base station) will be described. In this case, the base station sets the same slot format for all terminal devices existing in the same cell. Specifically, the base station can set the slot format for each cell by one of the following three methods. (2A-1) Setting with RRC signaling (2A-2) Setting in Group Common PDCCH (2A-3) Setting in combination with RRC signaling and PDCCH (including group common) (DCI: Downlink Control Information)

[0151] [2B: How to set it for each device] Secondly, a method of setting for each terminal will be described. In this case, the base station sets the slot format individually for each terminal device present in the cell. Specifically, the base station can set the slot format for each terminal by one of the following three methods. (2B-1) Set in UE specific RRC signaling (Dedicated signaling) (2B-2) Setting by PDCCH (DCI) (2B-3) Setting in combination with RRC signaling and PDCCH (DCI: Downlink Control Information) When the slot format is set for each terminal, the setting method may be further divided into the following two methods. (2B-A) When there are multiple cells set for the same UE, (2B-B) If multiple BWPs are set in at least one cell,

[0152] [Notifications sent to device] When the base station notifies the terminal device of the slot format setting, the notification contents differ in the following two patterns. The notification contents in each pattern will be specifically described below. (Pattern 1) When a new symbol for sidelink communication is defined (Pattern 2) When using existing symbols for sidelink communication

[0153] [Pattern 1: When a new symbol for sidelink communication is defined] The notification contents when a new symbol for sidelink communication is defined will be described. In this case, first, the base station generates a new slot format including a symbol for sidelink communication according to the definition shown in (1A) above. Alternatively, a slot format including a symbol for sidelink communication is newly defined in 3GPP or the like, and the base station uses an index corresponding to each slot format as slot format information. For example, when the number of symbols in one slot is 14, the newly generated slot format information is information indicating the state pattern of the 14 symbols. Specifically, the base station stores a list of symbol patterns in the slot format as table information, and adds the newly generated slot format information to this table information. More specifically, a reserved information area exists in this table information, and the newly generated slot format is added to this reserved information area. More specifically, when the table information is configured with 0-255 (256 formats), the range of 56-254 is the reserved information area (format), and the newly generated slot format is written into any of 56-254. In other words, any one of slot formats 56-254 is assigned to a newly generated slot format.

[0154] Then, when the base station sets the generated new slot format (or slot format information) for each cell, the base station notifies (sets) it to all terminal devices present in the cell by any of the methods (2A-1) to (2A-3) described above, i.e., RRC signaling, PDCCH (DCI), or a combination of RRC signaling and PDCCH (DCI).

[0155] At this time, the base station may notify the terminal device of the state of each symbol in the newly generated slot format as it is. Specifically, when the base station newly generates the slot format shown in FIG. 22, the base station notifies the terminal device of information indicating the slot format "DDDDSSS". In other words, the base station notifies the terminal device of information that arranges the states of symbols in the slot format. In addition or instead of this, the base station may notify the terminal device of the corresponding Format number (eg, in the range of 56-254) in order to notify the terminal device of the newly generated slot format.

[0156] The base station may notify the assigned Slot Format Combination ID together with the information on the symbol states in an array. That is, when multiple Slot Formats are set in advance by RRC signaling, the base station generates one or multiple Slot Format Combinations including one or multiple Slot Formats, and sets an ID for each Slot Format Combination. The ID (Slot Format Combination ID) may be notified to the terminal device.

[0157] Additionally or alternatively, the base station may include the generated new slot format (or slot format information) in the above-mentioned TDD configuration information (TDD-UL-DL-ConfigurationCommon) and notify the terminal device of the generated new slot format. Additionally or alternatively, the above-mentioned TDD configuration information may be extended to notify the terminal device of the generated new slot format. For example, TDD-UL-DL-ConfigurationCommon may be named TDD-UL-DL-SL-ConfigurationCommon.

[0158] Furthermore, when the base station sets the generated new slot format for each terminal, the base station notifies (sets) each terminal device individually by any of the above-mentioned (2B-1) to (2B-3), that is, UE specific RRC signaling (Dedicated signaling), PDCCH (DCI), or a combination of RRC signaling and PDCCH (DCI). In this case, the base station may notify the terminal device of the state of each symbol in the newly generated slot format as it is, or may notify the terminal device of the corresponding format number (range of 56-254) in order to notify the terminal device of the newly generated slot format. Furthermore, the base station may notify the assigned Slot Format Combination ID together with information on the symbol state in an array. That is, when multiple Slot Formats are set in advance by RRC signaling, the base station generates one or more Slot Format Combinations including one or more Slot Formats, and sets an ID for each Slot Format Combination. The ID (Slot Format Combination ID) may be notified to the terminal device.

[0159] Alternatively, the base station may include the generated new slot format (or information on the slot format) in the above-mentioned TDD configuration information (TDD-UL-DL-ConfigDedicated) and notify the terminal device of the generated new slot format. Additionally or alternatively, the above-mentioned TDD configuration information may be extended to notify the terminal device of the generated new slot format. For example, TDD-UL-DL-ConfigDedicated may be named TDD-UL-DL-SL-ConfigDedicated.

[0160] [Pattern 2: When using an existing symbol for sidelink communication] Next, the notification contents when using an existing symbol for sidelink communication will be described. When using an existing symbol for sidelink communication, the base station may need to notify the terminal device of the following two points. (A) Notification of which existing symbols to use for sidelink communications (B) Notification of the type of communication that can be used for sidelink communications (also)

[0161] As the notification (setting) method for the above (A) and (B), notification (setting) can be performed by one of the following two methods or a combination thereof. -How to define and notify a new RRC configuration - How to define and notify a new DCI for sidelink communication

[0162] [A: Notification of which existing symbol to use for sidelink communication] The base station needs to notify (set) to the terminal device which existing symbol (which uplink symbol or flexible symbol) is to be used for sidelink communication among the slot format set for the terminal device. When performing this notification (setting), the base station can notify by, for example, a bitmap.

[0163] Specifically, for example, assume that the current slot format is "FFFFUUUUUFFFUU". When the base station indicates that the first to fourth flexible symbols can be used for sidelink communication, for example, the base station notifies the terminal device of the configuration bitmap of "111100000000000". By receiving this notification, the terminal device can use the first to fourth flexible symbols of the slot format "FFFFUUUUUFFFUU" for sidelink communication. Note that the base station may notify (set) the above bitmap "11110000000000" in association with a slot format number or a slot format combination ID. This allows the terminal device to know that the bitmap of "11110000000000" corresponds to the slot format "FFFFUUUUUFFFUU".

[0164] [B: Notification of the type of communication for which the symbol to be used (also) for sidelink communication is to be used] When using an existing symbol for sidelink communication, as described in (1B) above, the base station needs to notify (set) the terminal device which communication to perform: sidelink communication only, uplink communication only, or simultaneous sidelink and uplink communication. In other words, the base station needs to indicate whether a symbol that can be used for (also) sidelink communication is to be used for sidelink communication only, or for both sidelink and uplink communication.

[0165] When making this notification, the base station can notify, for example, by a bitmap. Specifically, when the first and second symbols of the slot format "FFFFUUUUUFFFUU" are used only for sidelink communication and the third and fourth symbols are used both for sidelink communication and uplink communication, the base station notifies the terminal device of a bitmap of "1100xxxxxxxxxxx." Note that "x" in the above bitmap indicates that any value of 0 or 1 may be used. This allows the terminal device to use the first and second symbols of the slot format "FFFFUUUUUFFFUU" only for sidelink communication and the third and fourth symbols for simultaneous sidelink communication and uplink communication.

[0166] In this case, a slot format number or a slot format combination ID may be associated with the bitmap "1100xxxxxxxxxxx." This allows the terminal device to know that "1100xxxxxxxxxxx" corresponds to the slot format "FFFFUUUUUFFFUU."

[0167] In the above, the notification method using a bitmap is shown as an example. As an alternative to the notification method using the bitmap, for example, a symbol number (nbr_symbol) and a communication type (type_symbol) available for the symbol may be associated with each other for each symbol in the slot format and notified to the terminal device. For example, when indicating that the fifth symbol is to be used for sidelink communication, information associating nbr_symbol "0101" with type_symbol "1" (assuming that the bit value indicating use for sidelink communication is "1") is notified to the terminal device. By receiving this notification, the terminal device can use the fifth symbol in the slot format for sidelink communication.

[0168] Next, a more detailed example of the configuration notification will be described using the TDD configuration information (TDD-UL-DL-ConfigurationCommon, TDD-UL-DL-ConfigDedicated) as an example. The TDD configuration information may include, for example, the following information (6) and (7) related to sidelink communication in addition to the above information (1) to (5). (6) Position and number of sidelink symbols (7) All sidelinks for each symbol

[0169] The above (6) may be notified as sequence information of sidelink symbols or sequence information of bitmaps. More specifically, it may be a message configuration (ASN.1) as shown in FIG. 27. FIG. 27 is a diagram showing an example of a notification of a configuration. In FIG. 27, the bold underlined part indicates an information element (Information Element) that is assumed to be newly defined in order to notify the terminal device of information related to sidelink communication. For example, "pattern3" (TDD-SL Pattern) may be newly defined in TDD-UL-DL-ConfigurationCommon. The "TDD-SL Pattern" IE may be selectable (CHOICE) between "symbols" and "bitmaps" as the pattern type. When "bitmaps" is selected, "oneSlot" or "twoSlot" may be set by "symbolBitmapsForSlotFormat". The "symbolBitmapsForSlotFormat" may indicate the above-mentioned bitmap by "oneSlot" or "twoSlot". On the other hand, when "symbols" is selected as the pattern type, "nrofSidelinkSymbols" may be set. Here, "nrofSidelinkSymbols" corresponds to the "number of sidelink symbols" in the above-mentioned (6) Positions and number of sidelink symbols.

[0170] Furthermore, "allSidelink" may be newly defined in "symbols" in TDD-UL-DL-ConfigDedicated. Furthermore, "nrofSidelinkSymbols" may be newly defined in "explicit" in the same "symbols".

[0171] Here, "nrofSidelinkSymbols" may be defined as follows: "nrofSidelinkSymbols" denotes the number of consecutive sidelink symbols starting from the symbol following the last downlink symbol specified by nrofDownlinkSymbols, where the consecutive sidelink symbols may or may not overlap with some of the consecutive uplink symbols depending on the configuration and UE capabilities.

[0172] Furthermore, the above-mentioned "symbolBitmapsForSlotFormat" may be defined as follows: "symbolBitmapsForSlotFormat" indicates a bitmap symbol pattern for defining one or more sidelink symbols in one or two slots. This bitmap symbol pattern is mapped to an uplink or downlink TDD configuration (e.g. the above-mentioned slot format) configured in the UE.

[0173] <3-3.(3) How to change the slot format> The above (1) shows the case where a new slot format including symbols for sidelink communication is designed. Also, (2) shows the case where existing symbols are used for sidelink communication. (3) explains the case where symbols in a slot format are changed. Note that changing symbols is sometimes called reconfiguring or overriding symbols.

[0174] First, an example of the operation of the base station and the terminal device when changing the symbol in the slot format will be described. Specifically, the following two examples of the operation of the base station and the terminal device when changing the symbol in the slot format are considered. (3A) The base station decides to change the symbol and instructs the terminal device to change it. (3B) The terminal device decides to change the symbol and changes the symbol

[0175] [3A: The base station decides to change the symbol and instructs the terminal device to change it] First, the base station decides to change the symbol and instructs the terminal device to change the symbol. In this case, the following four examples of the operation of the base station are considered. The operation of the base station and the terminal device in each case will be specifically explained. (3A-1) Changing the slot format set by RRC signaling using DCI (reconfiguring / rewriting) (3A-2) Changing the slot format set by DCI by RRC (reconfiguring / rewriting) (3A-3) Changing the slot format set by Cell Specific RRC in UE Specific RRC (reconfiguring / rewriting) (3A-4) Changing the slot format set in Group Common PDCCH by UE Specific DCI (reconfiguring / rewriting)

[0176] The base station notifies the terminal device of the slot format setting by the methods shown in (3A-1) to (3A-4), and then instructs the terminal device to rewrite symbols in the set slot format by the methods shown in (3A-1) to (3A-4) when predetermined information transmitted from the terminal device satisfies a predetermined rewrite condition. Note that the rewrite condition is a condition for rewriting the state of the symbols, and the details of the condition will be described later. In addition, the predetermined information transmitted from the terminal device is, for example, information such as the channel congestion status (CBR: Channel Busy Ratio), the traffic model of the terminal device, the service type of the sidelink communication, communication priority information (Priority information), the interference level, and the resource usage status.

[0177] The operations of the base station and the terminal device in (3A-1) to (3A-4) will be specifically described below.

[0178] [3A-1: Change the slot format set by RRC Signaling using DCI] (Base station operation) In this case, the base station changes the slot format set by RRC signaling, for example, by DCI for sidelink communication. Specifically, first, the base station sets a slot format in the terminal device by RRC signaling. Note that the slot format set by RRC signaling may be one or more symbols in one or more slots set by TDD configuration information (TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated). Also, the slot format set by RRC signaling may be one or more slot formats included in one or more SlotFormat Combination IDs.

[0179] Next, when the rewrite condition described later is satisfied, the base station decides to rewrite the symbol, and notifies the terminal device of the symbol change using DCI for sidelink communication. For example, the base station notifies the terminal device of the symbol number of the symbol to be changed and the state of the symbol after the change. The rewrite condition will be described in detail later.

[0180] (Terminal device operation) In the case of (3A-1), the terminal device first sets the slot format notified by the base station through RRC signaling. Then, when the terminal device is notified of a symbol change by the DCI for sidelink communication from the base station, the terminal device rewrites the state of the symbols in the slot format according to the notification content.

[0181] [3A-2: RRC changes the slot format set by DCI] (Base station operation) In this case, the base station first notifies the terminal device of one or more slot formats by DCI format 2_0 including an SFI that specifies one or more slot formats (e.g., SlotFormatCombination). Next, the base station decides to rewrite the symbol when a rewrite condition described later is satisfied, and notifies the symbol change by, for example, a predetermined RRC configuration (various setting information described above (e.g., TDD setting information)). For example, the base station notifies the terminal device of the symbol number of the symbol to be changed, the slot including the symbol to be changed, and the state of the symbol after the change.

[0182] (Terminal device operation) In the case of (3A-2), the terminal device sets one or more slot formats (e.g., SlotFormatCombination) specified by the SFI in DCI format 2_0 transmitted from the base station. Next, the terminal device rewrites the symbol state according to the RRC configuration from the base station. That is, the terminal device rewrites a specific symbol in a slot indicated by the RRC configuration so that the symbol state after the change indicated by the RRC configuration is set.

[0183] [3A-3: Changing the slot format set in Cell Specific RRC in UE Specific RRC] (Base station operation) In this case, the base station notifies the terminal device in the cell of the slot format to be set by Cell Specific RRC (for example, TDD-UL-DL-ConfigurationCommon). Next, the base station decides to rewrite the symbols when a rewrite condition described later is satisfied, and notifies the terminal device to which the symbols should be rewritten of the symbol change individually by UE Specific RRC (for example, TDD-UL-DL-ConfigDedicated). For example, when the base station uses TDD-UL-DL-ConfigDedicated, the base station may set the symbols to include a symbol for sidelink communication among the multiple symbols to be set. In addition, after transmitting TDD-UL-DL-ConfigurationCommon, the base station may transmit TDD-UL-DL-ConfigDedicated, the configuration of which includes a symbol for sidelink communication, to the terminal device. When the UE receives the TDD-UL-DL-ConfigDedicated, if TDD-UL-DL-ConfigurationCommon has already been set, the UE may reconfigure / override its own configuration by TDD-UL-DL-ConfigDedicated.

[0184] (Terminal device operation) In the case of (3A-3), the terminal device first sets the slot format specified by TDD-UL-DL-ConfigurationCommon received from the base station. Next, the terminal device decides to rewrite symbols when a rewrite condition described later is satisfied, and when TDD-UL-DL-ConfigDedicated is received from the base station, rewrites the symbols in the slots specified by TDD-UL-DL-ConfigDedicated so that they are in the state of the symbols specified by the TDD-UL-DL-ConfigDedicated.

[0185] [3A-4: Changing the slot format set in Group Commnon PDCCH by UE Specific DCI] (Base station operation) In this case, the base station first notifies the terminal device of the slot format to be set by the Group Common PDCCH. The slot format specified by the Group Common PDCCH may be one or more slot formats indicated by SlotFormatCombination identified by SlotFormat Combination ID corresponding to the SFI specified by DCI format 2_0. Next, the base station notifies the change of the symbol by UE Specific DCI. For example, the UE Specific DCI may be DCI for sidelink communication. That is, the symbol in one or more slot formats indicated by SlotFormatCombination identified by SlotFormat Combination ID corresponding to the SFI specified by DCI format 2_0 is reconstructed by DCI for sidelink communication. Note that the DCI for sidelink communication here may include information indicating the symbol to be changed (rewritten), the slot including the symbol, and the state of the symbol after the change.

[0186] (Terminal device operation) In the case of (3A-4), the terminal device sets one or more slot formats indicated by a SlotFormatCombination identified by a SlotFormat Combination ID corresponding to an SFI specified in DCI format 2_0 received from the base station. Next, the terminal device rewrites symbols in the slot format based on the DCI for sidelink communication received from the base station. Note that the DCI for sidelink communication here may include information indicating the symbol to be changed (rewritten), the slot including the symbol, and the state of the symbol after the change.

[0187] [3B: The terminal device decides to change the symbol and changes the symbol] The second case is when the terminal device decides to change the symbol and changes the symbol. In other words, the terminal device itself decides to change the symbol, rather than receiving instructions from the base station. In this case, the operations of the base station and the terminal device are as follows. First, an example of the operation of the base station is as follows.

[0188] (Base station operation) The base station sets a rewrite condition, which will be described later, and notifies the terminal device. The base station notifies the terminal device of the rewrite condition, for example, by RRC or DCI. The base station may notify all terminal devices in the cell of the set rewrite condition, may notify a specific group unit including a plurality of terminal devices in the cell, or may notify each terminal device individually. When notifying the terminal device individually, for example, a dedicated channel may be used.

[0189] (Terminal device operation) When the information on the communication in the terminal device satisfies the rewrite condition set by the base station, the terminal device rewrites the symbol in the slot format. Then, when the terminal device rewrites the symbol, the terminal device notifies the base station and other terminal devices that the symbol has been rewritten.

[0190] The terminal device notifies the base station that the symbols have been rewritten, for example, by PUCCH or PUSCH. Also, the terminal device transmits PUCCH or PUSCH using uplink symbols or flexible symbols that have not been rewritten among the symbols in the slot format.

[0191] In addition, the terminal device notifies other terminal devices that the symbols have been rewritten, for example, by the PSCCH, the PSSCH, or the PSFCH. The terminal device transmits the PSCCH, the PSSCH, or the PSFCH using an uplink symbol, a flexible symbol, or a sidelink symbol that has not been rewritten among the symbols in the slot format.

[0192] In addition, the other terminal device that receives this notification may or may not rewrite the symbol of its own slot format in order to perform sidelink communication with the terminal device. For example, when the other terminal device is outside the cell of the base station, the other terminal device rewrites the current slot format to the new slot format notified by the terminal device and performs communication using the new slot format. This allows sidelink communication with the terminal device when the other terminal device cannot communicate with the base station.

[0193] In addition, when another terminal device is in the cell of the base station, the other terminal device does not rewrite the current slot format and communicates using the current slot format. In other words, when the other terminal device can communicate with the base station, the other terminal device does not rewrite the symbols to those for sidelink communication in order to prioritize communication with the base station.

[0194] (Rewrite conditions) Next, a specific example of the above-mentioned rewrite condition will be described. For example, the following conditions are considered as the rewrite condition. Note that the rewrite condition may be set by the base station as described above, or may be specified in advance in a standard specification. ·CBR(Channel Busy Ratio) Traffic model (e.g. packet size and periodicity) QoS (Quality of Service) requirements Priority Information

[0195] [CBR] For example, the base station decides to rewrite symbols when the CBR reported from the terminal device satisfies a preset rewrite condition. For example, when the base station determines that the communication channel for sidelink communication is congested based on the CBR, it rewrites the uplink symbols or flexible symbols in the current slot format to sidelink symbols or uplink / sidelink symbols. This increases the resources available for sidelink communication, thereby improving the communication congestion. Note that when the terminal device decides to rewrite symbols by itself, the terminal device decides to rewrite symbols based on the CBR acquired by itself and rewrites the symbols.

[0196] [Traffic Model] For example, the base station decides to rewrite symbols when the traffic model reported from the terminal device satisfies a preset rewrite condition. Specifically, the base station predicts the transmission timing of the terminal device and the amount of resources required for transmission based on the traffic model, and rewrites symbols to obtain an appropriate slot format that matches the prediction result. For example, when the packet size of the sidelink communication of the terminal device is large, the base station (or the terminal device) rewrites uplink symbols and flexible symbols to sidelink symbols or uplink / sidelink symbols. This increases the amount of resources for sidelink communication, so that appropriate communication can be performed even when the packet size is large. In addition, when the transmission period of the terminal device is long, for example, the base station (or the terminal device) may reduce the total number of sidelink symbols when transmitting multiple times in a predetermined slot format. In other words, when the transmission period of the terminal device is long, the sidelink symbols in the slot format for multiple times may be relatively reduced. Note that when the terminal device itself determines symbol rewrite, the terminal device decides to rewrite symbols based on the traffic model acquired by itself and rewrites the symbols.

[0197] [QoS] For example, the base station determines the rewriting of symbols based on the QoS request of the terminal device. This point will be described with reference to FIG. 28. FIG. 28 is a diagram showing an example of symbol rewriting. When symbols are used in the order shown in FIG. 28 (from left to right on the page), the base station rewrites an arbitrary uplink symbol shown in FIG. 27 (the 14th symbol in FIG. 27) to a symbol capable of sidelink communication (which may be only sidelink communication or both sidelink communication and uplink communication) in order to satisfy the maximum delay request from packet generation of the first symbol. As a result, in the slot format after the rewriting, sidelink communication can be performed in the 14th symbol, so that the maximum delay request in sidelink communication can be satisfied. Note that when the terminal device itself determines the symbol rewriting, the terminal device determines the symbol rewriting based on the QoS request and rewrites the symbol.

[0198] [Priority Information] For example, the base station decides to rewrite the symbol based on priority information indicating the priority of the communication. For example, it is assumed that the base station sets a symbol for simultaneous sidelink and uplink communication in the current slot format to the terminal device. In such a case, the base station rewrites the symbol of the communication type to be prioritized (communication type with higher priority) among the sidelink symbol and the uplink symbol based on the priority information of the terminal device. This makes it possible to avoid simultaneous sidelink communication and uplink communication, and to give priority to the communication to be prioritized among the sidelink communication and the uplink communication.

[0199] [Example of symbol rewriting] When rewriting symbols in a slot format, the rewrite pattern is as shown in Fig. 29. Fig. 29 is a diagram showing a symbol rewrite pattern in a slot format. In Fig. 29, a sidelink symbol is indicated by "S", a downlink symbol is indicated by "D", an uplink symbol is indicated by "U", and a flexible symbol is indicated by "F". According to Fig. 28, the combinations that can be rewritten ("Y" in Fig. 29) are as follows: - Change F symbol to S symbol - Change F symbol to U / S symbol - Change U symbol to S symbol - Changed U symbol to U / S symbol Changed S symbol to U symbol - Change S symbol to F symbol or U / S symbol - Change U / S symbol to U symbol or S symbol

[0200] Each of the above rewrites will be specifically described below.

[0201] [Change F symbol to S symbol] This is a case where a flexible symbol included in an existing slot format is rewritten to a symbol for sidelink communication. This allows a terminal device to perform sidelink communication using the flexible symbol in the slot format. That is, sidelink communication can be performed without interfering with communication by uplink symbols and downlink symbols set in the existing slot format.

[0202] [Change F symbol to U / S symbol] This is a case where a flexible symbol included in an existing slot format is rewritten to a symbol capable of implementing uplink communication and sidelink communication, whereby a terminal device can use the flexible symbol to perform either sidelink communication or uplink communication (sidelink or uplink), or simultaneous sidelink communication and uplink communication (sidelink and uplink).

[0203] For example, in a use case where a symbol for sidelink communication or uplink communication (sidelink or uplink) is set, the terminal device basically performs uplink communication using the rewritten symbol, and performs sidelink communication using the rewritten symbol when, for example, other sidelink symbols in the same slot format cannot be used. This makes it possible to support use cases such as URLLC communication and resource preemption.

[0204] As a use case in which a symbol for simultaneous communication of sidelink communication and uplink communication (sidelink and uplink) is set, the terminal device transmits information to a base station by uplink communication and at the same time transmits information to other terminals, etc. by sidelink communication. This makes it possible to support use cases in which HARQ Feedback is transmitted to a base station and other terminals at the same time.

[0205] [Change U symbol to S symbol] This is the case where symbols for uplink communication included in an existing slot format are rewritten to symbols for sidelink communication. This rewriting is performed, for example, when there is no flexible symbol in the slot format, or when a flexible symbol is present but cannot be rewritten. Alternatively, this rewriting is performed when the number of required sidelink symbols is insufficient in the current slot format. For example, when consecutive sidelink symbols are required in the time axis direction, the terminal device rewrites the existing symbols so that the sidelink symbols are consecutive.

[0206] Specifically, if there is a slot format of "DDDDDDDDDDSSUSS", the 13th uplink symbol is rewritten to a sidelink symbol. This allows the 11th to 15th consecutive symbols to be used for sidelink communication. Alternatively, if flexible symbols can be used for sidelink communication, the 13th uplink symbol in the slot format of "DDDDDDDDDDFFUFF" can be rewritten to a sidelink symbol (or flexible symbol) to allow the 11th to 15th consecutive symbols to be used for sidelink communication.

[0207] [Change U symbol to U / S symbol] This is a case where a symbol for uplink communication included in an existing slot format is rewritten to a symbol capable of implementing both uplink communication and sidelink communication. Specifically, the symbol is rewritten to either sidelink communication or uplink communication (sidelink or uplink), or simultaneous sidelink communication and uplink communication (sidelink and uplink). As a result, the terminal device is still capable of uplink communication even after the rewriting, so that the terminal device can perform sidelink communication while minimizing the impact on uplink communication due to the rewriting of the uplink symbol.

[0208] Furthermore, for example, the terminal device can determine whether to perform uplink communication or sidelink communication based on the above-mentioned priority information. As a specific use case, a use case is assumed in which the terminal device transmits HARQ Feedback 4 ms after receiving PDSCH from the base station. In this case, by rewriting the symbol 4 ms later to a U / S symbol, when HARQ Feedback is prioritized based on the priority information, uplink communication is performed with the base station, and when a safety message is prioritized based on the priority information, sidelink communication is performed with another terminal device. Alternatively, when the priorities of uplink communication and sidelink communication are the same, the terminal device performs uplink communication and sidelink communication simultaneously. In this way, by rewriting the uplink symbol to a symbol that can perform uplink communication and sidelink communication, it is possible to flexibly respond to communication according to the priority of information.

[0209] [Change S symbol to U symbol] This is a case where the sidelink symbols included in the slot format newly generated by (1A) above are rewritten to uplink symbols. As such a use case, it is assumed that the amount of transmission data of information to be uplink communicated is large, and the number of uplink symbols is insufficient with the existing slot format. Specifically, when a large amount of data is uplink communicated from a terminal device, the base station rewrites the sidelink symbols to uplink symbols if the number of uplink symbols in the existing slot format is insufficient. This makes it possible to transmit a large amount of data to the base station by uplink communication, for example, even if there is no room for the number of flexible symbols.

[0210] [Change S symbol to F symbol or U / S symbol] This is a case where the sidelink symbol included in the slot format newly generated by the above (1A) is rewritten to a flexible symbol or a symbol capable of sidelink communication and uplink communication (sidelink or uplink symbol, or sidelink and uplink symbol). As a use case of this, a case where a traffic model of the sidelink communication is changed is assumed. For example, when a terminal device changes from transmitting periodic traffic to transmitting non-periodic traffic, when a sidelink symbol that was scheduled to be used from now becomes unused due to this change, the sidelink symbol resource is wasted. Therefore, by rewriting the existing sidelink symbol to a flexible symbol or a symbol capable of performing sidelink communication and uplink communication according to the traffic change, the terminal device can perform uplink communication or downlink communication even when the terminal device no longer performs sidelink communication, and therefore the waste of resources can be minimized.

[0211] [Change U / S symbol to U symbol or S symbol] This is the case where a symbol capable of carrying out sidelink communication and uplink communication (sidelink or uplink symbol, or sidelink and uplink symbol) included in the slot format newly generated by the above (1A) is rewritten to an uplink symbol or a sidelink symbol. As such a use case, there is a case where a receiving terminal needs to determine whether a transmitting terminal is transmitting uplink communication or sidelink communication.

[0212] Specifically, the receiving terminal needs to perform blind decoding to determine whether the transmission from the transmitting terminal is uplink communication or sidelink communication, which may result in increased complexity of the decoding. For example, by rewriting a symbol (sidelink or uplink) that can implement sidelink communication or uplink communication to an uplink symbol or sidelink symbol, the receiving terminal does not need to perform decoding to make the determination.

[0213] In addition, the receiving terminal can avoid a situation where the result of Energy Evaluation is inappropriate when performing Sidelink Measurement by rewriting symbols that can perform both sidelink communication and uplink communication (sidelink and uplink symbols) to uplink symbols or sidelink symbols.

[0214] Furthermore, on the transmitting terminal side, even if power sharing cannot be performed well when performing uplink communication or sidelink communication (sidelink or uplink), or if inter subcarrier interference occurs between uplink communication and sidelink communication (sidelink and uplink), the transmitting terminal can solve the problems that arise in such cases by rewriting the symbol to an uplink symbol or a sidelink symbol.

[0215] <<4. Modifications>> The above-described embodiment is merely an example, and various modifications and applications are possible in addition to or in place of the above-described embodiment. At least some of the following modifications may be applied to some or all of the above-described embodiment.

[0216] For example, the above-mentioned TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated may be configured so that the slot configuration configured in the UE (terminal device) includes one or more downlink symbols, uplink symbols, flexible symbols, and sidelink symbols. Also, the above-mentioned DCI format 2_0 may indicate directly, or indirectly via the SFI, that the slot format configured in the terminal device includes one or more downlink symbols, uplink symbols, flexible symbols, and sidelink symbols. Note that the SFI may be one-to-one associated with the SlotFormat Combination ID. The SlotFormat Combination ID may correspond to one or more slot formats.

[0217] Additionally or alternatively, if the following conditions (a) to (d) are met, the terminal device may use a flexible symbol (or a set thereof) to perform SL (sidelink) transmission or SL reception on a Physical Sidelink Channel. (a) the Slot Configuration set in the terminal device by TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated includes one or more flexible symbols, or TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated are not provided to the terminal device, (b) a terminal device detects (receives) DCI format 2_0 including an SFI for providing a slot format, and the DCI format 2_0 indicates a plurality of symbols (or a set thereof) as flexible symbols; (c) The terminal device does not detect a DCI format (e.g., DCI format 1_0, DCI format 1_1, or DCI format 0_1) for receiving a PDSCH and a CSI-RS, or the terminal device does not detect a DCI format (e.g., DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, DCI format 2_3) for transmitting a PUSCH, a PUCCH, a PRACH, or an SRS, or an RAR UL grant; and (d) Receive DCI format X_Y indicating SL transmission or SL reception by the terminal device on the Physical Sidelink Channel.

[0218] In this case, the terminal device may rewrite or reconfigure the flexible symbol (or its set) to a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel, and transmit or receive the Physical Sidelink Channel. In other words, in this case, the terminal device may recognize (consider) the flexible symbol (or its set) as a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel, or may perform SL transmission or SL reception on the Physical Sidelink Channel by assuming that the flexible symbol (or its set) is a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel. Note that the conditions (a) to (d) in this case may be further used as conditions (rewrite conditions) for determining whether to perform (or instruct) symbol rewrite by the method shown in (3A-1) to (3A-4) above.

[0219] Additionally or alternatively, when the following conditions (a) to (c) are satisfied, the terminal device may perform SL transmission or SL reception on the Physical Sidelink Channel using a flexible symbol (or a set thereof). (a) the Slot configuration set in the terminal device by TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated includes one or more flexible symbols, or TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated are not provided to the terminal device; (b) The terminal device does not receive DCI format 2_0 including SFI to provide the slot format, and (c) Receive DCI format X_Y indicating SL transmission or SL reception by the terminal device on the Physical Sidelink Channel.

[0220] In this case, the terminal device may rewrite or reconfigure the flexible symbol (or its set) to a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel, and perform SL transmission or SL reception on the Physical Sidelink Channel. In other words, in this case, the terminal device may recognize (consider) the flexible symbol (or its set) as a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel, or may perform SL transmission or SL reception on the Physical Sidelink Channel after assuming that the flexible symbol (or its set) is a symbol (or its set) for SL transmission or SL reception on the Physical Sidelink Channel. In this case, the conditions (a) to (c) may be further used as conditions (rewrite conditions) for determining whether to perform (or instruct) symbol rewrite by the method shown in (3A-1) to (3A-4) above.

[0221] The above-mentioned Physical Sidelink Channel may be any one of the following (a) to (d), or may include any one of (a) to (d). (a)PSBCH (Physical Sidelink Broadcast Channel) (b) PSCCH (Physical Sidelink Control Channel) (c)PSDCH (Physical Sidelink Discovery Channel) (d)PSSCH (Physical Sidelink Shared Channel)

[0222] Furthermore, the DCI format X_Y for the terminal device to perform SL transmission or SL reception of the Physical Sidelink Channel may be defined as a new DCI format. For example, the DCI format X_Y may be DCI format 3_0 or DCI format 5_0.

[0223] Furthermore, the above-mentioned DCI format X_Y may include the following information (a) to (c). (a) Resource for PSCCH-6 bits (b)TPC command for PSCCH and PSSCH-1bit (c) SCI format 0 fields

[0224] In addition, the above-mentioned (c) SCI format 0 fields may include the following information (c1) to (c3). (c1) Frequency hopping flag (c2)Resource block assignment and hopping resource allocation (c3) Time resource pattern

[0225] In addition, the application of this embodiment is not limited to V2X communication. This embodiment can be applied to use cases other than V2X communication using sidelink communication. For example, application examples of this embodiment include D2D communication and MTC communication. This embodiment can also be applied to moving cell and relay communication. That is, V2X communication may not be a required component of this embodiment.

[0226] Furthermore, although the present embodiment has been described as a method for Mode 3 resource allocation, it is also applicable to Mode 4.

[0227] Furthermore, although this embodiment has been described as a method for an FDM type resource pool, it is also applicable to a TDM type resource pool.

[0228] This embodiment is also applicable to multi-carrier communication in which sidelink communication is performed using multiple carriers.

[0229] In addition, the control device that controls the management device 10, base station device 20, base station device 30, terminal device 40, or mobile device 50 in this embodiment may be realized by a dedicated computer system or a general-purpose computer system.

[0230] For example, a program for executing the above-mentioned operations is stored in a computer-readable recording medium such as an optical disk, a semiconductor memory, a magnetic tape, or a flexible disk and distributed. Then, for example, the program is installed in a computer and the above-mentioned process is executed to configure a control device. In this case, the control device may be a device (e.g., a personal computer) external to the management device 10, the base station device 20, the base station device 30, the terminal device 40, or the mobile device 50. Also, the control device may be a device (e.g., the control unit 13, the control unit 24, the control unit 34, the control unit 45, or the control unit 55) internal to the management device 10, the base station device 20, the base station device 30, the terminal device 40, or the mobile device 50.

[0231] The communication program may be stored in a disk device provided in a server device on a network such as the Internet, and may be downloaded to a computer. The above-mentioned functions may be realized by cooperation between an OS (Operating System) and application software. In this case, the parts other than the OS may be stored on a medium and distributed, or the parts other than the OS may be stored in a server device and may be downloaded to a computer.

[0232] Furthermore, among the processes described in the above embodiments, all or part of the processes described as being performed automatically can be performed manually, or all or part of the processes described as being performed manually can be performed automatically by a known method. In addition, the information including the processing procedures, specific names, various data and parameters shown in the above documents and drawings can be changed arbitrarily unless otherwise specified. For example, the various information shown in each drawing is not limited to the illustrated information.

[0233] In addition, each component of each device shown in the figure is a functional concept, and does not necessarily have to be physically configured as shown in the figure. In other words, the specific form of distribution and integration of each device is not limited to that shown in the figure, and all or part of them can be functionally or physically distributed and integrated in any unit according to various loads, usage conditions, etc.

[0234] Moreover, the above-described embodiments can be appropriately combined in an area where the processing contents are not contradictory.

[0235] <<5. Conclusion>> As described above, according to an embodiment of the present disclosure, a base station device (for example, base station device 20, base station device 30) includes a communication unit (wireless communication unit 21, 31) and a control unit 24, 34. The communication unit (wireless communication unit 21, 31) communicates with a terminal device (terminal device 40, mobile device 50). When at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, the control unit 24, 34 transmits, to the terminal device, information for the terminal device to use at least one symbol as a symbol for performing sidelink communication. This allows the terminal device to perform sidelink communication using the NR slot format, thereby satisfying various service requirements in NR V2X communication, thereby achieving high communication performance.

[0236] Although the embodiments of the present disclosure have been described above, the technical scope of the present disclosure is not limited to the above-described embodiments as they are, and various modifications are possible without departing from the gist of the present disclosure. In addition, components of different embodiments and modifications may be appropriately combined.

[0237] Furthermore, the effects of each embodiment described in this specification are merely examples and are not limiting, and other effects may also be provided.

[0238] The present technology can also be configured as follows. (1) A communication unit that communicates with a terminal device; a control unit that transmits, when at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication; A base station device comprising: (2) The control unit is generating a slot format including a symbol for performing the sidelink communication, and transmitting the generated slot format to the terminal device; The base station device according to (1). (3) The control unit is Transmitting information for changing a symbol for performing communication other than the side link communication, which is included in a slot format set in the terminal device, to a symbol for performing the side link communication, to the terminal device. A base station device as described in (1) or (2). (4) The control unit is When the information reported from the terminal device satisfies a predetermined rewrite condition, the change of the symbol is decided, and information for changing the symbol to a symbol for performing the sidelink communication is transmitted to the terminal device. The base station device according to (3). (5) The information reported from the terminal device is Information about channel congestion The base station device according to (4). (6) The information reported from the terminal device is Information regarding a traffic model of the terminal device. The base station device according to (4). (7) The information reported from the terminal device is Information regarding the QoS requirements of the terminal device. The base station device according to (4). (8) The information reported from the terminal device is Information regarding the priority of communication of the terminal device. The base station device according to (4). (9) The control unit is Transmitting information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to all terminal devices belonging to a cell managed by the base station. The base station device according to any one of (1) to (8). (10) The control unit is The base station transmits information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to each of the terminal devices belonging to a cell managed by the base station. The base station device according to any one of (1) to (9). (11) The information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication is bitmap information. The base station device according to any one of (1) to (10). (12) The symbol for performing the sidelink communication is A symbol for performing only the sidelink communication. The base station device according to any one of (1) to (11). (13) The symbol for performing the sidelink communication is A symbol for performing sidelink or uplink communication. The base station device according to any one of (1) to (12). (14) The symbol for performing the sidelink communication is This symbol indicates simultaneous sidelink and uplink communication. The base station device according to any one of (1) to (13). (15) communicating with a terminal device; and when at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, control is performed to transmit, to the terminal device, information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication. A method for controlling a base station device comprising: (16) A terminal device, A communication unit that communicates with a base station device; a control unit that receives, when at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication from the base station device; A terminal device comprising: (17) A method for controlling a terminal device, comprising: communicating with a base station device; receiving, from the base station device, information for the terminal device to use at least one symbol included in a slot format set in the terminal device as a symbol for performing sidelink communication when the at least one symbol is a symbol for performing communication other than sidelink communication; A method for controlling a terminal device comprising: [Explanation of symbols]

[0239] 1. Information Processing Systems 10 Management device 20, 30 Base station equipment 40 Terminal Equipment 50 Mobile equipment 11, 23, 33, 43, 53 Network Communication Section 12, 22, 32, 42, 52 storage section 13, 24, 34, 45, 55 Control section 21, 31, 41, 51 Wireless communication section 44, 54 Input / output section 211, 311, 411, 511 Receiving processing unit 212, 312, 412, 512 Transmission processing unit 213, 313, 413, 513 Antennas

Claims

1. A communication unit that communicates with a terminal device; a control unit that, when at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, transmits to the terminal device information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication, and, when information reported from the terminal device satisfies a predetermined rewrite condition, determines a change of the symbol for performing communication other than the sidelink communication and transmits to the terminal device information for changing the symbol to the symbol for performing the sidelink communication; A base station device comprising:

2. The control unit is generating a slot format including a symbol for performing the sidelink communication, and transmitting the generated slot format to the terminal device; The base station device according to claim 1 .

3. The information reported from the terminal device is Information about channel congestion The base station device according to claim 1 .

4. The information reported from the terminal device is Information regarding a traffic model of the terminal device. The base station device according to claim 1 .

5. The information reported from the terminal device is Information regarding the QoS requirements of the terminal device. The base station device according to claim 1 .

6. The information reported from the terminal device is Information regarding the priority of communication of the terminal device. The base station device according to claim 1 .

7. The control unit is Transmitting information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to all terminal devices belonging to a cell managed by the base station. The base station device according to claim 1 .

8. The control unit is The base station transmits information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to each of the terminal devices belonging to a cell managed by the base station. The base station device according to claim 1 .

9. The information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication is bitmap information. The base station device according to claim 1 .

10. The symbol for performing the sidelink communication is A symbol for performing only the sidelink communication. The base station device according to claim 1 .

11. The symbol for performing the sidelink communication is A symbol for performing sidelink or uplink communication. The base station device according to claim 1 .

12. The symbol for performing the sidelink communication is This symbol indicates simultaneous sidelink and uplink communication. The base station device according to claim 1 .

13. communicating with a terminal device; When at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, transmitting information to the terminal device for allowing the terminal device to use the at least one symbol as a symbol for performing sidelink communication, and when information reported from the terminal device satisfies a predetermined rewrite condition, determining a change of the symbol for performing communication other than the sidelink communication and transmitting information for changing the symbol to the symbol for performing the sidelink communication to the terminal device. A method for controlling a base station device comprising:

14. A terminal device, A communication unit that communicates with a base station device; a control unit that, when at least one symbol included in a slot format set in the terminal device is a symbol for performing communication other than sidelink communication, receives from the base station device information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication, and, when information reported from the terminal device satisfies a predetermined rewrite condition, determines a change of the symbol for performing communication other than the sidelink communication and receives from the base station device information for changing the symbol to the symbol for performing the sidelink communication; A terminal device comprising:

15. A method for controlling a terminal device, comprising: communicating with a base station device; receiving, from the base station device, information for the terminal device to use at least one symbol included in a slot format set in the terminal device as a symbol for performing sidelink communication, when the at least one symbol included in the slot format set in the terminal device is a symbol for performing communication other than sidelink communication, and, when information reported from the terminal device satisfies a predetermined rewrite condition, determining a change of the symbol for performing communication other than the sidelink communication and receiving, from the base station device, information for changing the symbol to the symbol for performing the sidelink communication; A method for controlling a terminal device comprising:

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