Base station device, method of controlling base station device, terminal device, and method of controlling terminal device

Abstract

The base station device (20, 30) has a communication unit (21, 31) and a control unit (24, 34). The communication unit (21, 31) communicates with the terminal device (40, 50). When at least one symbol included in a time slot format set in the terminal device (40, 50) is a symbol for performing communication other than sidelink communication, the control unit (24, 34) transmits, to the terminal device (40, 50), information that enables the terminal device (40, 50) to use the at least one symbol as a symbol for performing sidelink communication.

Description

Technical Field

[0001] This disclosure relates to base station equipment, methods for controlling base station equipment, terminal equipment, and methods for controlling terminal equipment. Background Technology

[0002] In recent years, mobile communication systems supporting communication with mobile entities have been proposed. Furthermore, these systems need to support vehicle-to-everything (V2X) communication for use in automobiles. In the past, V2X communication was developed based on LTE.

[0003] Citation List

[0004] Patent documents

[0005] Patent Document 1: JP 2017-208796 A Summary of the Invention

[0006] Technical issues

[0007] However, various use cases exist in V2X communication, and various requirements (such as communication reliability, latency, etc.) must be met to support these use cases. However, traditional LTE-based V2X communication cannot adequately meet these requirements, which may result in poor communication performance.

[0008] Therefore, this disclosure provides base station equipment, methods for controlling base station equipment, terminal equipment, and methods for controlling terminal equipment that help achieve high communication performance.

[0009] Solution to the problem

[0010] The base station equipment includes a communication unit and a control unit. The communication unit communicates with the terminal equipment. When at least one symbol included in the time slot format configured in the terminal equipment is a symbol used for communication other than sidelink communication, the control unit sends information to the terminal equipment for use by the terminal equipment as a symbol for sidelink communication using at least one symbol. Attached Figure Description

[0011] Figure 1 This is a diagram used to describe V2X communication.

[0012] Figure 2 This is an example diagram showing an overall picture of V2X communication.

[0013] Figure 3 This is a diagram illustrating an example of a use case for V2X communication.

[0014] Figure 4 This is a diagram illustrating an example of V2V communication according to scenario 1.

[0015] Figure 5This is a diagram illustrating an example of V2V communication according to scenario 2.

[0016] Figure 6 This is a diagram illustrating an example of V2V communication according to scenario 3.

[0017] Figure 7 This is a diagram illustrating an example of V2V communication according to scenario 4.

[0018] Figure 8 This is a diagram illustrating an example of V2V communication according to scenario 5.

[0019] Figure 9 This is a diagram illustrating an example of V2V communication according to scenario 6.

[0020] Figure 10 This is a diagram showing the frame configuration of NR.

[0021] Figure 11 This is a diagram illustrating an example of subcarrier spacing settings.

[0022] Figure 12 This is a diagram showing an example of a resource grid.

[0023] Figure 13 This is a diagram showing the time slot format.

[0024] Figure 14 This is a diagram showing the time slot format.

[0025] Figure 15 This is a diagram illustrating a configuration example of an information processing system according to an embodiment of the present disclosure.

[0026] Figure 16 This is a diagram illustrating a specific configuration example of an information processing system.

[0027] Figure 17 This is a diagram illustrating an example configuration of a management device according to an embodiment of the present disclosure.

[0028] Figure 18A This is a diagram illustrating an example configuration of a base station device according to an embodiment of the present disclosure.

[0029] Figure 18B This is a diagram illustrating an example configuration of a base station device according to an embodiment of the present disclosure.

[0030] Figure 19 This is a diagram illustrating an example configuration of a base station device according to an embodiment of the present disclosure.

[0031] Figure 20 This is a diagram illustrating a configuration example of a terminal device according to an embodiment of the present disclosure.

[0032] Figure 21This is a diagram illustrating an example configuration of a mobile device according to an embodiment of the present disclosure.

[0033] Figure 22 This is a diagram illustrating an example of a time slot format that includes symbols used to perform side link communication.

[0034] Figure 23 This is a diagram illustrating an example of a time slot format that includes symbols used to perform side link communication.

[0035] Figure 24 This is a diagram illustrating an example of a time slot format that includes symbols used to perform side link communication.

[0036] Figure 25 This is a diagram illustrating an example of a time slot format that includes symbols used to perform side link communication.

[0037] Figure 26 This is a diagram illustrating an example of a time slot format that includes symbols used to perform side link communication.

[0038] Figure 27 This is a diagram showing an example of a configuration notification.

[0039] Figure 28 This is a diagram illustrating an example of symbol overriding.

[0040] Figure 29 This is a diagram illustrating the symbol rewriting patterns in the time slot format. Detailed Implementation

[0041] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that in each of the following embodiments, the same parts are designated by the same reference numerals, and therefore, repeated descriptions thereof will be omitted.

[0042] Furthermore, in this specification and accompanying drawings, multiple components having substantially the same functional configuration can be distinguished from each other by adding different letters after the same reference numerals. For example, if necessary, multiple configurations having substantially the same functional configuration, such as base station device 201 and base station device 202, can be distinguished. However, when it is not necessary to specifically distinguish each of the multiple components having substantially the same functional configuration, the multiple components are simply represented by the same reference numerals. For example, when it is not necessary to distinguish between base station devices 201 and 202, it is simply referred to as base station device 20.

[0043] Furthermore, this disclosure will be described in the order of the items shown below.

[0044] 1. Introduction

[0045] 1-1. Overview of V2X Communication

[0046] 1-2. V2X Use Cases

[0047] 1-3. Physical layer enhancement

[0048] 1-4. V2X Operation Scenarios

[0049] 1-5. Summary of this embodiment

[0050] 2. Information Processing System Configuration

[0051] 2-1. Overall Configuration of Information Processing System

[0052] 2-2. Configuration of Management Equipment

[0053] 2-3. Base station equipment (network) configuration

[0054] 2-4. Base station equipment (infrastructure) configuration

[0055] 2-5. Terminal Equipment Configuration

[0056] 2-6. Mobile Device Configuration

[0057] 3. Operation of the information processing system

[0058] 3-1. New Design of Time Slot Format

[0059] 3-2. Methods for configuring time slot formats

[0060] 3-3. Methods for changing the time slot format

[0061] 4. Modification

[0062] 5. Conclusion

[0063] <<1. Introduction>>

[0064] Traditionally, mobile communication systems have provided communication capabilities for mobile terminals such as mobile phones and smartphones. However, in recent years, it has become important for mobile communication systems to support communication for mobile devices that are different from mobile terminal types, such as cars, drones, and robots.

[0065] For example, in recent years, mobile communication systems have needed to support vehicle-to-everything (V2X) communication as a means of communication for automobiles. Examples of communication for automobiles include road-to-vehicle communication implemented by Intelligent Transportation Systems (ITS) and vehicle-to-vehicle communication implemented by lateral link communication. These communication technologies may become important technologies for realizing autonomous driving in the future.

[0066] Here, V2X communication is communication between a vehicle and "something". Figure 1This is a diagram used to describe V2X communication. Examples of "something" here include vehicles, infrastructure, networks, pedestrians, etc. Communication between vehicles is called vehicle-to-vehicle (V2V) communication. Furthermore, communication between a vehicle and infrastructure is called vehicle-to-infrastructure (V2I) communication. Furthermore, communication between a vehicle and a network is called vehicle-to-network (V2N) communication. Furthermore, communication between a vehicle and a pedestrian is called vehicle-to-pedestrian (V2P) communication. In this embodiment, vehicles, infrastructure, networks, and pedestrians in V2X can each communicate with the other as user equipment (UE) or as base stations (radio access networks).

[0067] <1-1. Overview of V2X Communication>

[0068] Figure 2 This is an example diagram showing an overall picture of V2X communication. Figure 2 In the example shown, the cloud server has V2X application server (APP server) functionality. The cloud server connects to the core network via a network such as the Internet. The core network consists of devices with V2X communication control capabilities. Multiple base stations connect to the core network. The base stations (RAN) have communication capabilities with terminal devices (…). Figure 2 The example UE (vehicle example) has wireless communication capabilities (e.g., Uu link connectivity using the Uu interface). Furthermore, the base station has the capability to support direct communication such as V2V and V2P communication (e.g., sidelink communication). Note that the Roadside Unit (RSU) is installed on the road as infrastructure. There are two possible RSU types: base station type RSU and UE type RSU. For example, an RSU may have V2X data relay capabilities and APP provisioning capabilities.

[0069] <1-2. V2X Use Cases>

[0070] As for automotive radio communication, the development of Dedicated Short Range Communication (DSRC) based on 802.11p has been primarily driven. However, in recent years, standardization of "LTE-based V2X" as a vehicle-to-vehicle communication based on Long Term Evolution (LTE) has been implemented. In LTE-based V2X communication, the exchange of basic security messages, etc., is supported. In recent years, research has been conducted on NR V2X communication using 5G technology (New Radio (NR)) to further improve V2X communication.

[0071] Figure 3This diagram illustrates examples of V2X communication use cases. V2V communication use cases include forward approach warning, intersection collision prevention, emergency vehicle warning, queuing, overtaking abort warning, and road construction warning. V2I communication use cases include road safety information notification, traffic light coordination, parking assistance, and billing. V2P communication use cases include pedestrian warning. V2N communication use cases include dynamic link sharing, remote driving, and in-car entertainment.

[0072] NR V2X communication supports new use cases requiring high reliability, low latency, high-speed communication, and high capacity, which LTE-based V2X currently cannot support. Figure 3 Examples of these use cases include, for instance, the provision of dynamic maps, remote driving, etc. Other examples include sensor data sharing, where sensor data is exchanged between vehicles and road vehicles, and platooning use cases for platooning. These NR V2X communication use cases and requirements are described in 3GPP TR22.886, etc. The following (1) through (4) are brief descriptions of some of these use cases.

[0073] (1) Vehicle platooning

[0074] As a use case for NR V2X communication, platooning may occur. Placing refers to multiple vehicles forming a convoy and traveling in the same direction. Information used to control platooning is exchanged between the vehicle leading the platoon and other vehicles. NR V2X communication is used to exchange this information. By exchanging information using NR V2X communication, the inter-vehicle distance in platooning can be further reduced.

[0075] (2) Extended Sensors

[0076] An example of a use case for NR V2X communication is the exchange of sensor-related information (raw data before processing and processed data). Sensor information is collected through local sensors, real-time video images between surrounding vehicles, RSUs or pedestrians, V2X application servers, etc. By exchanging this information, vehicles can obtain information that they cannot obtain through their own sensors and can identify / recognize a wider range of environments. In this use case, a large amount of information needs to be exchanged, therefore, the communication requires a high data rate.

[0077] (3) Advanced driving

[0078] Use cases for NR V2X communication can include semi-autonomous driving and fully autonomous driving. The RSU shares cognitive / identification information obtained from its own sensors, etc., with surrounding vehicles. Therefore, each vehicle can synchronously and coordinately adjust its trajectory or operation. Through the use of NR V2X communication, each vehicle can also share its driving intentions or purposes with surrounding vehicles.

[0079] (4) Remote driving

[0080] Use cases for NR V2X communication can include remote control via pilot or V2X applications. For example, remote control can be used by people who cannot drive or are in dangerous areas. Cloud-based mobility can also be used for public transportation, where routes and roads are fixed to some extent. In this use case, communication requires high reliability and low transmission latency.

[0081] Please note that the use cases shown above are merely examples. The V2X communication use cases in this embodiment can be other than these.

[0082] <1-3. Physical Layer Enhancement>

[0083] To achieve the above requirements, further enhancements to the physical layer from LTE V2X are needed. Target links may include: Uu links, which are links between infrastructure such as base stations or RSUs and terminals; and PC5 links (sidelinks), which are links between terminals. Examples of the main enhancements are shown below (1) through (9).

[0084] (1) Channel format

[0085] (2) Side link feedback communication

[0086] (3) Sidelink resource allocation method

[0087] (4) Vehicle location information estimation technology

[0088] (5) Inter-terminal relay communication

[0089] (6) Support for unicast and multicast communication

[0090] (7) Multi-carrier communication, carrier aggregation

[0091] (8) MIMO / beamforming

[0092] (9) High frequency support (example: 6GHz or higher)

[0093] Note that (1) examples of channel format enhancements include flexible parameter sets (numerology), short transmission time intervals (TTI), multiple antenna support, waveforms, etc. Furthermore, (2) examples of enhancements to sidelink feedback communication may include HARQ, channel state information (CSI), etc.

[0094] <1-4. V2X Operation Scenarios>

[0095] Next, examples of V2X communication operation scenarios will be described. In V2N communication, communication between the base station and the terminal is simple, involving only DL / UL communication. However, in V2V communication, various communication paths can be considered. In the following description, examples of V2V communication will be used to describe each scenario, but the same communication operations can be applied to V2P and V2I. In this case, the communication destination is not a vehicle, but a pedestrian, base station, or RSU.

[0096] (1) Scene 1

[0097] Figure 4 An example of V2V communication according to Scenario 1 is shown. In Scenario 1, vehicles (example UEs) communicate directly using sidelink communication. A sidelink is a communication link between terminals such as PC5. Besides PC5, sidelinks are sometimes referred to as V2V communication links, V2P communication links, V2I communication links, etc. Figure 4 In the example, vehicles communicate directly with each other using lateral link communication without going through a radio access network. Figure 4 In the example, the Evolved Universal Terrestrial Radio Access Network (E-UTRAN) is shown as a radio access network, but a radio access network is not limited to E-UTRAN. For example, a radio access network could be NG-RAN.

[0098] (2) Scene 2

[0099] Figure 5 An example of V2V communication according to Scenario 2 is shown. In Scenario 2, vehicles (example UEs) communicate with each other via a radio access network. Figure 5 In the example, data is sent from one vehicle to multiple vehicles. Note that in... Figure 5 In this context, Uu represents the Uu interface. The Uu interface is the wireless interface between the terminal and the base station. UL represents the uplink, and DL represents the downlink. Even in Figure 5 In the example, E-UTRAN is shown as a radio access network, but radio access networks are not limited to E-UTRAN. For example, a radio access network could be NG-RAN.

[0100] (3) Scene 3

[0101] Figure 6 An example of V2V communication according to Scenario 3 is shown. In Scenario 3, vehicles communicate with each other via RSU and radio access network. Even in Figure 6 In the example, data is also sent from one vehicle to multiple vehicles. Figure 6 In the example, a vehicle and an RSU are connected to each other via a lateral link. Even in Figure 6In the example, E-UTRAN is shown as a radio access network, but radio access networks are not limited to E-UTRAN. For example, a radio access network could be NG-RAN. Additionally, in Figure 6 In this context, the RSU is shown as a device operating as a UE, but is not limited to this. For example, in Figure 6 In this context, the RSU can operate as part of the RAN (E-UTRAN or NG-RAN) (e.g., gNB-DU, RRH, and RRU).

[0102] (4) Scene 4

[0103] Figure 7 An example of V2V communication according to Scenario 4 is shown. In Scenario 4, vehicles communicate with each other via RSU and radio access network. Figure 7 In the example, multiple vehicles and RSUs are connected to each other via lateral links. Even in Figure 7 In the example, E-UTRAN is shown as a radio access network, but radio access networks are not limited to E-UTRAN. For example, a radio access network could be NG-RAN. Additionally, in Figure 6 In this context, the RSU is shown as a device operating as a UE, but is not limited to this. For example, in Figure 6 In this context, the RSU can operate as part of the RAN (E-UTRAN or NG-RAN) (e.g., gNB DU, RRH, and RRU).

[0104] (5) Scene 5

[0105] Figure 8 An example of V2V communication according to Scenario 5 is shown. In Scenario 5, vehicles communicate with each other via RSUs without going through the radio access network. Figure 8 The RSU shown is a fixed-site RSU. For example, the radio access network could be NG-RAN. Additionally, in Figure 6 In this context, the RSU is shown as a device operating as a UE, but is not limited to this. For example, in Figure 6 In this context, the RSU can operate as part of the RAN (E-UTRAN or NG-RAN) (e.g., gNB DU, RRH, and RRU).

[0106] (6) Scene 6

[0107] Figure 9 An example of V2V communication according to Scenario 6 is shown. In Scenario 6, vehicles communicate with each other via RSUs without going through the radio access network. Figure 9 The RSU shown is a mobile station type RSU.

[0108] <1-5. Summary of this embodiment>

[0109] In past V2X communications (such as 3GPP Rel.12 or later V2X communications), LTE radio frames were used. For example, in conventional V2X communications, LTE radio frames have been used to perform sidelink communications such as the sidelink control channel (Physical Sidelink Control Channel (PSCCH)) and the sidelink data channel (Physical Sidelink Shared Channel (PSSCH)).

[0110] On the other hand, for example, when using LTE radio frames in NR V2X communication, the requirements in scenarios 1 to 6 above may not be met. In other words, in NR V2X communication, for example, when performing high-speed mass-capacity communication (eMBB) or low-latency high-reliability communication (URLLC) on a vehicle (e.g., the UE example), it is necessary to support requests for different service types. However, in LTE frame configurations, for example, when performing URLLC communication, there is a possibility that ultra-latency requirements cannot be met. Therefore, in NR V2X communication, for example, when performing URLLC communication, it is preferable to use the NR parameter set and frame configuration instead of the LTE frame configuration. In other words, in NR V2X communication, to meet the requests for different services, it is preferable to use the NR parameter set and frame configuration of NR-side downlink communication.

[0111] [NR Frame Configuration]

[0112] Here, we will refer to Figure 10 Describes the frame configuration of NR. Figure 10 This is a diagram illustrating the frame configuration of NR. (For example...) Figure 10 As shown, a radio frame consists of 10 ms. A radio frame consists of two half-frames. The time interval between a half-frame is 5 ms. In addition, a half-frame consists of five subframes. The time interval between a subframe is 1 ms. Furthermore, a subframe consists of one or more time slots. Figure 10 An example is shown where one subframe consists of four time slots. Furthermore, the time interval between each time slot varies depending on the parameter set (OFDM parameter set). Additionally, the parameter set is defined by a combination of subcarrier spacing (SCS) and cyclic prefix (CP).

[0113] Figure 11 This is a diagram illustrating an example of subcarrier spacing settings. (Example:) Figure 11As shown, the subcarrier spacing is defined by powers of 2 relative to 15kHz. Specifically, the subcarrier spacing is set to 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz. When the subcarrier spacing is 15kHz, the number of time slots per subframe is 1. That is, when the subcarrier spacing is 15kHz, the time slot interval is 1ms; when the subcarrier spacing is 30kHz, the time slot interval is 0.5ms; when the subcarrier spacing is 60kHz, the time slot interval is 0.25ms; when the subcarrier spacing is 120kHz, the time slot interval is 0.125ms; and when the subcarrier spacing is 240kHz, the time slot interval is 0.0625ms. Furthermore, as... Figure 11 As shown, in the case of normal CP (cyclic prefix), the number of symbols in a time slot is 14, and in the case of extended CP, the number of symbols in a time slot is 12.

[0114] [Resource Grid]

[0115] Next, we will refer to Figure 12 To describe the resource grid. Figure 12 This is a diagram illustrating an example of a resource grid. In this embodiment, the transmitted physical signal or physical channel is represented by a resource grid in its corresponding parameter set and subcarriers. A resource grid is defined by multiple resource elements. A resource element at a given antenna port is represented by a subcarrier and a symbol. That is, the index of a resource element at a predetermined antenna port can be represented by a combination of a subcarrier index and a symbol index.

[0116] Furthermore, in this embodiment, a resource block (RB) is defined as a unit along the frequency axis. A resource block consists of 12 consecutive subcarriers along the frequency axis. Additionally, there are common resource blocks (CRBs), physical resource blocks (PRBs), and virtual resource blocks (VRBs). A common resource block is a resource block defined by a predetermined frequency bandwidth and a predetermined parameter set. A common resource block begins at point A in all parameter sets. The frequency specified at point A is the center of subcarrier #0 of common resource block #0 in all parameter sets. A physical resource block is a resource block defined within a predetermined frequency bandwidth portion. Furthermore, the physical resource block index is numbered starting from 0 within its predetermined frequency bandwidth portion. A virtual resource block is a logical resource block. For example, a virtual resource block is used when mapping precoded signals of the Physical Downlink Shared Channel (PDSCH) or Physical Uplink Shared Channel (PUSCH) to physical resource blocks.

[0117] [Time Slot Format]

[0118] Next, the time slot format, which indicates the status of symbols included in the time slot, will be described. Figure 13 and 14This is a diagram illustrating the time slot format. In a Time Division Duplex (TDD) cell (unpaired spectrum), each symbol included in a time slot can be classified as downlink (DL), uplink (UP), or flexible. Figure 13 and 14 In this context, the downlink is referred to as "D", the uplink as "U", and the flexible link as "F". Note that in the following text, the downlink may be referred to as "downlink" and the uplink as "uplink".

[0119] For example, when receiving information from a base station, the terminal device uses downlink symbols in time-slot format to receive the information. Conversely, when sending information to the base station, the terminal device uses uplink symbols in time-slot format. Furthermore, flexible symbols in time-slot format can be used by the terminal device to send or receive information from the base station. Alternatively, flexible symbols can be used for downlink and uplink handover periods or protection periods.

[0120] The state of each symbol in the time slot format is configured by information sent from the base station. Specifically, the state of each symbol is specified in the TDD configuration information (TDD-UL-DL-ConfigurationCommon) that is common to the terminal device (e.g., cell-specific) and included in the Radio Resource Control (RRC) messages (e.g., SystemInformationBlockType1 (SIB1), RRCSetup message, RRCReconfiguration message) sent from the base station, or in the TDD configuration information (TDD-UL-DL-ConfigDedicated) that is specific to the individual terminal device (UE).

[0121] For example, the common TDD configuration information for terminal devices includes the following information (1) to (5).

[0122] (1) The number of downlink slots (e.g., nrofDownlinkSlots) and the number of downlink symbols (e.g., nrofDownlinkSymbols).

[0123] (2) The number of uplink slots (e.g., nrofUplinkSlots) and the number of uplink symbols (e.g., nrofUplinkSymbols).

[0124] (3) Information regarding the uplink / downlink switching periodicity (e.g., DL-UL-TransmissionPeriodicity)

[0125] (4) Index of the target time slot (e.g., slotIndex)

[0126] (5) Information about each symbol in the target time slot. For example, all downlinks (all DL), all uplinks (all UL), the number of downlink symbols (e.g., nrofDownlinkSymbols), and the number of uplink symbols (e.g., nrofUplinkSymbols).

[0127] Furthermore, or conversely, the state of each symbol can be specified by a slot format index (e.g., DCI format 2_0) transmitted via the DCI. Specifically, the slot format index is a combination of 14 symbol states. Moreover, the slot format index is specified slot-by-slot. Note that the format specifying the slot format is also called the Slot Format Indicator (SFI). The terminal device can configure or change uplink, downlink, and flexible symbols symbol-by-symbol, and identify (consider) the symbols to be used based on the aforementioned TDD configuration information or the slot format index specified by the DCI.

[0128] Furthermore, or alternatively, the state of each symbol can 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 SlotFormats can be preset via RRC signaling, and the SFI_Index included in DCI format 2_0 can determine one or more SlotFormats that the UE will use. One or more SlotFormats can be included in one or more SlotFormatCombinations included in the RRC signaling. In this way, the terminal device can configure or change uplink, downlink, and flexible symbols symbol by symbol by symbol by combining RRC signaling and DCI (e.g., DCI format 2_0), and identify (consider) the symbols to be used.

[0129] Note that the time slot format configured in the terminal device can be a time slot configuration configured in the terminal device. That is, in this invention, the time slot format can be referred to as a time slot configuration. Here, the time slot configuration includes configuration information about one or more symbols in one or more time slots. The configuration information about one or more symbols includes information about the symbols described above or later (RRC and DCI parameters).

[0130] Figure 13 and 14 This shows the slot format representing the state of 14 symbols. For example, in Figure 13 The time slot format shown indicates that symbols 1 through 12 are downlink symbols (D), symbol 13 is a flexible symbol (F), and symbol 14 is an uplink symbol (U). These are used to specify... Figure 13The SFI format shown is sequentially "DDDDDDDDDDDDFU" starting from the first symbol of the time slot. This allows, for example, the transmission and reception of HARQ-ACKs corresponding to PDSCHs within the same time slot.

[0131] In addition, for example, in Figure 14 The time slot format shown indicates that the first symbol is the downlink symbol (D), the second symbol is the flexible symbol (F), and the third through fourteenth symbols are the uplink symbols (U). These are used to specify... Figure 14 The SFI format shown in the time slot is sequentially "DFUUUUUUUUUUUU" starting from the first symbol of the time slot. This allows, for example, the transmission and reception of PUSCH corresponding to UL licenses within the same time slot.

[0132] Note that in conventional LTE V2X communication, subframes used for uplink communication can be used for sidelink communication within the LTE frame configuration. In other words, while traditional LTE V2X communication is configured at the subframe unit level, NR V2X communication has the advantage of being configurable at the symbol unit level.

[0133] However, as mentioned above, when performing NR V2X communication, the current NR timeslot format only defines uplink, downlink, and flexible symbols. In other words, the current NR timeslot format does not define symbols for sidelink communication or operations for performing sidelink communication. Therefore, when performing NR V2X communication, it is difficult to use the current NR timeslot format, where symbols for sidelink communication cannot be configured without modification. Therefore, when performing NR V2X communication, a new timeslot format (symbols) capable of enabling sidelink communication must be defined, or new operations for performing sidelink communication must be specified.

[0134] Therefore, in this embodiment, when at least one symbol included in the time slot format (time slot configuration) configured in the terminal device is a symbol for communication other than side link communication, the base station sends information to the terminal device for use by the terminal device as a symbol for side link communication using at least one symbol.

[0135] Therefore, in this embodiment, the terminal device can use the NR timeslot format to perform sidelink communication. In other words, by using the NR timeslot format, the requirements of various services in NR V2X communication can be met, thereby achieving high communication performance.

[0136] Note that the above "symbols for performing communications other than sidelink communications" are, for example, symbols for performing uplink communications (uplink symbols) or flexible symbols capable of performing either uplink or downlink communications, but details of these symbols will be described later.

[0137] In addition, the aforementioned "information used by the terminal device as symbols for side link communication" may be, for example, the time slot format information configured for symbols for side link communication, or information on existing symbols used for side link communication, but the details will be described later.

[0138] This embodiment will be described in detail below.

[0139] <<2. Configuration of Information Processing System>>

[0140] First, refer to Figure 15 Information processing system 1, which describes an embodiment of the present disclosure. Figure 15 This is a diagram illustrating a configuration example of an information processing system 1 according to an embodiment of the present disclosure. Figure 15 The information processing system 1 shown is a mobile communication system that includes multiple communication devices (mobile devices and terminal devices) capable of sidelink communication.

[0141] For example, information processing system 1 is a radio communication system using Radio Access Technology (RAT) of New Radio (NR). This radio communication system is also known as a fifth-generation system (5GS). In this case, information processing system 1 is not limited to mobile phone communication systems, but can be, for example, an Intelligent Transportation System (ITS). Note that information processing system 1 is not limited to cellular communication systems, but can be, for example, other radio communication systems, such as wireless local area network (LAN) systems, aviation radio systems, or space radio communication systems.

[0142] Information processing system 1 can use NR radio access technology to provide application processing execution functions (e.g., edge functions) to mobile devices via a wireless network. NR is a cellular communication technology that enables mobile communication of mobile devices by arranging multiple areas covered by base station equipment in a cellular pattern.

[0143] In the following description, NR includes New Radio Access Technology (NRAT) and the further EUTRA (FEUTRA). Note that a single base station can manage multiple cells. Cells corresponding to NR are sometimes referred to as NR cells.

[0144] NR is the next-generation (fifth-generation) radio access technology (RAT) after LTE (including LTE-Advanced and LTE-Advanced Pro, which are fourth-generation communications). NR is a radio access technology that can be applied to various use cases, including enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC). NR is being researched to create a technology framework that supports the use cases, requirements, and deployment scenarios for these use cases.

[0145] In NR, base stations can be referred to as Next Generation RAN (NGRAN) nodes. When the core network is a 5G core (5GC), NGRAN refers to the RAN (RAN with a reference point of the 5GC). That is, NGRAN can include gNodeB (gNB) and ng-eNodeB (ng-eNB). Additionally, in NR, mobile devices are sometimes referred to as User Equipment (UE).

[0146] <2-1. Overall Configuration of the Information Processing System>

[0147] like Figure 15 As shown, 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. Furthermore, Figure 16 This diagram illustrates a specific configuration example of the information processing system 1. In addition to the configuration described above, the information processing system 1 may also have a cloud server device CS, but this may not be an essential component.

[0148] Network N1 consists of multiple devices configured in information processing system 1. Network N1 is, for example, a wireless network. For instance, network N1 is a mobile communication network configured using radio access technology such as NR. Network N1 consists of a radio access network (RAN) and a core network (CN).

[0149] Note that the devices in the diagram can be considered as logical devices (logical nodes). In other words, some devices in the diagram are implemented by virtual machines (VMs), containers, Docker containers, etc., and can be implemented on the same physical hardware.

[0150] [Cloud Server Equipment]

[0151] A cloud server device CS is a processing device (e.g., a server device) connected to network N2. For example, a cloud server device CS is a server host computer that processes requests from client computers (e.g., mobile device 50). The cloud server device CS can be a PC server, a mid-range server, or a mainframe server. Here, network N2 is a communication network connected to network N1 via a gateway device (e.g., UPF, S-GW, or P-GW). That is, network N2 is a data network (DN). Furthermore, network N2 can be, for example, a communication network such as the Internet, a local Internet Protocol (IP) network, and a telephone network (e.g., a fixed-line telephone network and a mobile phone network). Note that a cloud server device can be restated as a server device, a processing device, or an information processing device.

[0152] [Management Equipment]

[0153] Management device 10 is a device that manages the wireless network. For example, management device 10 is a device used for Access and Mobility Management Functions (AMF). Management device 10, together with gateway devices, is configured as part of the core network CN. The core network CN is a network owned by a predetermined entity (entity) 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 base station devices 20 and 30.

[0154] Note that management device 10 may have gateway functionality. For example, when the core network is 5GC, management device 10 may function as a User Plane Function (UPF). Furthermore, management device 10 may be an SMF, PCF, UDM, etc. Alternatively, the core network CN may include an SMF, PCF, UDM, etc.

[0155] Management device 10 is connected to multiple base station devices 20 and 30, respectively. For example, in the case of 5GS, there is an N2 reference point between AMF 10 and NG RAN 20 and 30, and AMF 10 and NG RAN 20 and 30 are logically connected to each other via NG interfaces. Management device 10 can manage the communication of base station devices 20 and 30. For example, for each mobile device 50, management device 10 manages the location of mobile device 50 in a regional unit (e.g., tracking area and RAN notification area) composed of multiple cells within network N1. Note that, for example, on a cell-by-cell basis for each mobile device, management device 10 can know and manage which base station device (or cell) mobile device 50 is connected to, which base station device (or cell) mobile device 50 is present in within the communication area, and so on. The cell provided by the base station is called the serving cell. Serving cells include primary cells (PCells) and secondary cells (SCells). When providing dual connectivity to a UE (e.g., terminal device 40 and mobile device 50) (e.g., EUTRA-EUTRA dual connectivity, EUTRA-NR dual connectivity (ENDC), EUTRA-NR dual connectivity with 5GC, NR-EUTRA dual connectivity (NEDC), and NR-NR dual connectivity), the PCell and SCell provided by the primary node (MN) are called the primary cell group. Furthermore, the serving cell may include primary and secondary cells or primary SCG cells (PSCell). That is, when providing dual connectivity to a UE, the PSCell and SCell provided by the secondary node (SN) are called the secondary cell group (SCG). A downlink component carrier and an uplink component carrier can be associated with a cell. Additionally, the system bandwidth corresponding to a cell can be divided into multiple bandwidth portions. In this case, one or more bandwidth portions can be set in the UE, and the UE can use one bandwidth portion as the active BWP. Furthermore, the radio resources (e.g., frequency band, parameter set (subcarrier spacing), time slot format (time slot configuration)) available to the mobile device 50 can be different for each cell, each component carrier, or each BWP.

[0156] [Base station equipment]

[0157] Base station equipment 20 is a radio communication device that wirelessly communicates with terminal equipment 40 and mobile device 50. Base station equipment 20 is a device constituting a V2N communication network. Base station equipment 20 is a communication device. As described above, base station equipment 20 can be a device corresponding to a radio base station (base station, node B, eNB, gNB, etc.) or a radio access point. Further or alternatively, when the base station equipment is an eNB, gNB, etc., the base station may be referred to as a 3GPP access. Further or alternatively, when the base station equipment is a radio access point, the base station may be referred to as a non-3GPP access. Further or alternatively, base station equipment 20 can be a radio relay station (relay node). Further or alternatively, base station equipment 20 can be an optical overhanging device called a remote radio head (RRH). Further or alternatively, when the base station equipment is a gNB, the base station equipment may be referred to as a combination of a gNB central unit (gNB CU) and a gNB distributed unit (gNB DU), or any of these units. The gNB Central Unit (gNB CU) carries multiple upper layers of the access layer (e.g., RRC, SDAP, PDCP) for communication with the UE. Conversely, the gNB-DU carries multiple lower layers of the access layer (e.g., RLC, MAC, PHY). That is, in the messages and information described later, RRC signaling can be generated by the gNB CU, while DCI can be generated by the gNB-DU. In this embodiment, the base station of the radio communication system can be referred to as a base station device. Base station device 20 can be configured to enable radio communication with other base station devices 20 and 30. For example, when multiple base station devices 20 and 30 are eNBs or a combination of eNBs and gNBs, these devices can be connected via the X2 interface. Further or alternatively, when multiple base station devices 20 and 30 are gNBs or a combination of eNBs and gNBs, these devices can be connected via the Xn interface. Further or alternatively, when multiple base station devices 20 and 30 are a combination of a gNB Central Unit (CU) and a gNB Distributed Unit (DU), these devices can be connected via the F1 interface. The message information (RRC signaling or DCI information) described later can be communicated between multiple base station devices 20 and 30 (e.g., via X2, Xn, and F1 interfaces). Note that the wireless access technology used by base station device 20 can be cellular communication technology or wireless LAN technology. Of course, the wireless access technology used by base station device 20 is not limited to these and can be other wireless access technologies. In addition, the radio communication used by base station device 20 can be radio communication using radio waves, or radio communication using infrared or visible light (optical radio).

[0158] Base station equipment 30 is a radio communication device that wirelessly communicates with terminal equipment 40 and mobile device 50. A base station is a device that constitutes the infrastructure in V2I communication. Base station equipment 30 is a type of communication device similar to base station equipment 20. For example, base station equipment 30 is a device corresponding to a radio base station (base station, node B, eNB, gNB, etc.) or radio access point. Base station equipment 30 can be a radio relay station. Base station equipment 30 can be a roadside base station device, such as a roadside unit (RSU). Furthermore, base station equipment 20 can be an optical suspension device called a remote radio head (RRH). Base station equipment 30 can be configured to enable radio communication with other base station equipment 30 and base station equipment 20. Note that the radio access technology used by base station equipment 30 can be cellular communication technology or wireless LAN technology. Of course, the wireless access technology used by base station equipment 20 is not limited to these and can be other wireless access technologies. Furthermore, the radio communication used by base station equipment 30 can be radio communication using radio waves, or radio communication using infrared or visible light (optical radio).

[0159] Note that base station devices 20 and 30 can communicate with each other via a base station device-core network interface (e.g., NG interface, S1 interface, etc.). This interface can be wired or wireless. Additionally, the base station devices can communicate with each other via an inter-base station interface (e.g., Xn interface, X2 interface, etc.). This interface can be wired or wireless.

[0160] Base station equipment 20 and 30 can be used, operated, and / or managed by various entities. For example, entities may include mobile network operators (MNOs), mobile virtual network operators (MVNOs), mobile virtual network enablers (MVNEs), neutral managed network (NHN) operators, enterprises, educational institutions (school companies, local government education committees, etc.), real estate (buildings, apartments, etc.) managers, individuals, etc. Of course, the entities using, operating, and / or managing base station equipment 20 and 30 are not limited to these. Base station equipment 20 and 30 can be installed and / or operated by an operator, or by an individual. Of course, the entities installing / operating base station equipment 20 are not limited to these. For example, base station equipment 20 and 30 can be jointly installed and operated by multiple enterprises or individuals. Furthermore, base station equipment 20 and 30 can be shared facilities used by multiple enterprises or individuals. In this case, the installation and / or operation of the equipment can be performed by a third party different from the user.

[0161] The concept of base station equipment (also known as a base station) includes not only donor base stations but also relay base stations (also known as relay stations or relay station equipment). Furthermore, the concept of a base station includes not only the structure with base station functions but also the equipment installed within that structure. For example, structures include high-rise buildings, houses, steel towers, station facilities, airport facilities, port facilities, stadiums, and other buildings. Note that the concept of a structure includes not only buildings but also non-building structures such as tunnels, bridges, dams, walls, iron pillars, and equipment such as cranes, doors, and wind turbines. Moreover, the concept of a structure includes not only structures on land (in a narrow sense) or underground but also structures on water, such as bridge piers and giant floating structures, as well as underwater structures such as marine observation facilities. Base station equipment can be restated as processing equipment or information processing equipment.

[0162] Base station equipment 20 and 30 can be fixed stations or mobile base station equipment (mobile stations). For example, base station equipment 20 and 30 can be equipment mounted on a mobile body, or the mobile body itself. For example, a relay station equipment with mobility can be considered as base station equipment 20, and base station equipment 30 can be considered as a mobile station. In addition, equipment equipped with the functions of base station equipment (at least some of the functions of base station equipment) (which are devices with initial mobility, such as vehicles, drones (aircraft), and smartphones) also correspond to base station equipment 20 and 30.

[0163] Here, a mobile body can be a mobile terminal such as a smartphone or mobile phone. Furthermore, a mobile body can be a body that moves on land (in a narrow sense, the ground) (e.g., vehicles such as cars, bicycles, buses, trucks, motorcycles, trains, linear locomotives, etc.) or a body that moves underground (e.g., in tunnels) (e.g., subways). Additionally, a mobile body can be a body that moves on water (e.g., ships such as passenger ships, cargo ships, or hovercraft) or a body that moves underwater (e.g., submersibles such as submersibles, submarines, and unmanned submersibles). Furthermore, a mobile body can be a body that moves in the atmosphere (e.g., aircraft such as airplanes, airships, and drones (air vehicles)) or a body that moves outside the atmosphere (e.g., artificial celestial bodies such as satellites, spacecraft, space stations, and space probes).

[0164] Furthermore, base station equipment 20 and 30 can be ground-based base station equipment (ground station equipment) installed on the ground. For example, base station equipment 20 and 30 can be base station equipment installed on a structure on the ground, or base station equipment installed on a mobile body moving on the ground. More specifically, base station equipment 20 and 30 can be antennas installed in a structure such as a building and signal processing equipment connected to the antennas. Of course, base station equipment 20 and 30 can be the structure or the mobile body itself. "Ground" refers not only to land (in the narrow sense) but also to the ground in a broad sense, including underground, water, and underwater. Note that base station equipment 20 and 30 are not limited to ground-based base station equipment. Base station equipment 20 and 30 can also be non-ground-based base station equipment (non-ground station equipment) that can float in the air or space. For example, base station equipment 20 and 30 can be aircraft station equipment or satellite station equipment.

[0165] Aircraft station equipment refers to radio communication equipment that can float in the atmosphere (including the stratosphere), such as aircraft. Aircraft station equipment can be equipment mounted on aircraft or the aircraft itself. Note that the concept of aircraft includes not only heavy aircraft such as airplanes and gliders, but also light aircraft such as balloons and airships. Furthermore, the concept of aircraft includes not only heavy and light aircraft, but also rotary-wing aircraft such as helicopters and autogyros. Note that aircraft station equipment (or aircraft equipped with aircraft station equipment) can be unmanned aerial vehicles (UAVs) such as drones. Note that the concept of UAVs also includes unmanned aerial vehicle systems (UAS) and tethered UASs. Furthermore, the concept of UAVs includes lighter-than-air UASs (LTA) and heavier-than-air UASs (HTA). Additionally, the concept of UAVs also includes high-altitude UAS platforms (HAPs).

[0166] Satellite station equipment is radio communication equipment that can float outside the atmosphere. Satellite station equipment can be mounted on a spacecraft such as a satellite, or it can be the spacecraft itself. The satellite used as satellite station equipment can be any of the following: low Earth orbit (LEO), medium Earth orbit (MEO), geostationary orbit (GEO), and highly elliptical orbit (HEO). Of course, satellite station equipment can be mounted on low Earth orbit, medium Earth orbit, geostationary orbit, and highly elliptical orbit satellites.

[0167] The coverage area of ​​base station devices 20 and 30 can be as large as a macro cell or as small as a pico cell. Of course, the coverage area of ​​base station devices 20 and 30 can also be very small, such as a femto cell. Additionally, base station devices 20 and 30 can have beamforming capabilities. In this case, base station devices 20 and 30 can have a service area or cell for each beamform.

[0168] [Terminal devices and mobile devices]

[0169] Terminal device 40 is a radio communication device that wirelessly communicates with base station device 20 or base station device 30. Terminal device 40 may be, for example, a mobile phone, a smart device (smartphone or tablet), a personal digital assistant (PDA), or a personal computer. Mobile device 50 may be a machine-to-machine (M2M) device or an Internet of Things (IoT) device (e.g., it may be referred to as an MTC UE, NB-IoT UE, and Cat.M UE). Terminal device 40 is capable of sidelink communication with mobile device 50 and other terminal devices 40. Note that the radio communication (including sidelink communication) used by terminal device 40 may be radio communication using radio waves or radio communication using infrared or visible light (optical radio).

[0170] Mobile device 50 is a mobile radio communication device that wirelessly communicates with base station device 20. Mobile device 50 can be a radio communication device installed in a mobile body, or it can be the mobile body itself. For example, mobile device 50 can be a vehicle moving on a road, such as a car, bus, truck, or motorcycle, or a radio communication device installed on a vehicle. Mobile device 50 is capable of sidelink communication with terminal device 40 and other mobile devices 50. Mobile device 50 can use automatic retransmission techniques such as HARQ when performing sidelink communication. Note that the radio communication (including sidelink communication) used by mobile device 50 can be radio communication using radio waves or radio communication using infrared or visible light (optical radio).

[0171] Note that a "mobile device" is a communication device, also known as a mobile station, mobile station equipment, terminal equipment, or terminal. The concept of "mobile device" includes not only mobile communication devices configured for movement but also mobile bodies equipped with communication devices. In this case, the mobile body can be a mobile terminal, or a mobile body moving on land (in a narrow sense), underground, on water, or underwater. Furthermore, the mobile body can be a mobile body moving in the atmosphere, such as a drone (airborne UE) or a helicopter, or a mobile body moving outside the atmosphere, such as a satellite.

[0172] In this embodiment, the concept of a communication device includes not only portable mobile devices (terminal devices) such as mobile terminals, but also devices installed in a structure or mobile body. The structure or mobile body itself can be considered a communication device. Furthermore, the concept of a communication device includes not only mobile devices (terminal devices, automobiles, etc.), but also base station equipment (donor base stations, relay base stations, etc.). A communication device is a processing device and an information processing device.

[0173] Mobile device 50, terminal device 40, and base station devices 20 and 30 are connected to each other via radio communication (e.g., radio waves or optical radio). When 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 switchover) or cell selection (reselection) is performed.

[0174] Mobile device 50 and terminal device 40 can simultaneously connect to multiple base station devices or multiple cells to perform communication. For example, when one base station device can provide multiple cells, mobile device 50 or terminal device 40 can perform carrier aggregation by using one cell as a PCell and another cell as an SCell. Alternatively, when multiple base station devices can each provide one or more cells, mobile device 50 or 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 PCell and SCell, and using one or more cells managed by another base station device (SN (e.g., SeNB or SgNB)) as a PSCell or PSCell and SCell. Note that DC can also be referred to as multi-connectivity (MC). Alternatively, through Coordinated Multipoint Transmission and Reception (CoMP) technology, mobile device 50 and terminal device 40 can also communicate with multiple base station devices through cells of different base station devices (multiple cells with different cell identifiers or the same cell identifier).

[0175] Note that mobile device 50 and terminal device 40 do not necessarily have to be devices directly used by humans. Mobile device 50 and terminal device 40 can also be sensors installed in factory machines, such as those used for machine-type communication (MTC). Furthermore, mobile device 50 can be a machine-to-machine (M2M) device or an Internet of Things (IoT) device. Additionally, mobile device 50 and terminal device 40 can be devices with relay communication capabilities, such as those represented by device-to-device (D2D) and vehicle-to-everything (V2X). Furthermore, mobile device 50 and terminal device 40 can be devices used in wireless backhaul, such as those called customer premises equipment (CPE).

[0176] The configuration of each device constituting the information processing system 1 according to this embodiment will be described in detail below.

[0177] <2-2. Configuration of Management Equipment>

[0178] Management device 10 is a device that manages the wireless network. For example, management device 10 manages the communication of base station devices 20 and 30. When the core network CN is 5GC, management device 10 can be a device that functions as, for example, AMF, SMF, UPF, etc. Management device 10 has application processing execution functions (e.g., edge functions) and can be used as a server device such as an application server. More specifically, when the UPF is located on a local area network (i.e., when the UPF is a local UPF), then the device for edge computing can be arranged in a DN that has an N6 reference point between the DN and the UPF. Then, the device for edge computing can be included in management device 10. The device for edge computing can operate, for example, as a multi-access edge computing (MEC) platform, an MEC host, or an MEC application.

[0179] Figure 17 This is a diagram illustrating 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... Figure 17 The configuration shown is a functional configuration, and the hardware configuration may differ. Furthermore, the functionality of management device 10 can be distributed and installed in multiple physically separate configurations. For example, management device 10 may consist of multiple server devices.

[0180] The network communication unit 11 is a communication interface used for communicating with other devices. The network communication unit 11 can be a network interface or a device connection interface. The network communication unit 11 has the function of directly or indirectly connecting to the network N1. For example, the network communication unit 11 may include a local area network (LAN) interface such as a network interface card (NIC), or it may include a universal serial bus (USB) interface consisting of a USB host controller, USB port, etc. Furthermore, the network communication unit 11 can be a wired interface or a wireless interface. The network communication unit 11 serves as a communication device for managing the device 10. The network communication unit 11 communicates with the base station devices 20 and 30 under the control of the control unit 13.

[0181] Storage unit 12 is a data readable / writable storage device, such as dynamic random access memory (DRAM), static random access memory (SRAM), flash memory, and hard disk. Storage unit 12 serves as a storage device for managing device 10. Storage unit 12 stores, for example, the connection status of mobile device 50. For example, storage unit 12 stores the EPS connection management (ECM) status or radio resource control (RRC) status of mobile device 50. Storage unit 12 can also be used as main memory to store the location information of mobile device 50.

[0182] Control unit 13 is the controller for each unit of management device 10. Control unit 13 is implemented by a processor such as a central processing unit (CPU) or a microprocessor unit (MPU). For example, control unit 13 can be implemented via random access memory (RAM) or the like, allowing the processor to execute various programs stored in storage devices within management device 10, which serves as the workspace. Note that control unit 13 can also be implemented by integrated circuits such as application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs). CPUs, MPUs, ASICs, and FPGAs can all be considered controllers.

[0183] <2-3. Configuration of Base Station Equipment (Network)>

[0184] Next, the configuration of base station device 20 will be described. Base station device 20 is a radio communication device that wirelessly communicates with mobile device 50. Base station device 20 functions as, for example, a radio base station, a radio relay station, or a radio access point. In this case, base station device 20 can be an optical suspension device such as an RRH (Radio Relay Header). As described above, base station device 20 is a device that constitutes a network in V2N communication.

[0185] Figure 18A and 18B This is a diagram illustrating an example configuration of a base station device 20 according to an embodiment of the present disclosure. Figure 18A As shown, the base station equipment 20 includes a radio communication unit 21, a storage unit 22, a network communication unit 23, and a control unit 24. Note that... Figure 18A The configuration shown is a functional configuration, and the hardware configuration may differ. Furthermore, the functionality of base station equipment 20 can be distributed and installed in multiple physically separate configurations. Figure 18B It shows Figure 18A The detailed configuration of the base station equipment 20 shown is as follows.

[0186] The radio communication unit 21 is a radio communication interface for wireless communication with other radio communication devices (e.g., mobile device 50, base station device 30, other base station devices 20). The radio communication unit 21 operates under the control of the control unit 24. Note that the radio communication unit 21 can support multiple radio access methods. For example, the radio communication unit 21 can support both NR and LTE. In addition to LTE, the radio communication unit 21 can also support W-CDMA and cdma2000. Of course, the radio communication unit 21 can support radio access methods other than NR, LTE, W-CDMA, or cdma2000.

[0187] The radio communication unit 21 includes a receiving processing unit 211, a transmitting processing unit 212, and an antenna 213. The radio communication unit 21 may include multiple receiving processing units 211, transmitting processing units 212, and antennas 213. When the radio communication unit 21 corresponds to multiple radio access methods, each part of the radio communication unit 21 can be configured separately for each radio access method. For example, the receiving processing unit 211 and the transmitting processing unit 212 can be configured using LTE and NR, respectively.

[0188] The receiving processing unit 211 processes the uplink signal received via the antenna 213. The receiving processing unit 211 includes a radio receiving unit 211a, a multiplexing and demultiplexing unit 211b, a demodulation unit 211c, and a decoding unit 211d.

[0189] Radio receiver 211a performs down-conversion, removal of unwanted frequency components, control of amplification level, quadrature demodulation, conversion to digital signal, removal of guard interval, and extraction of frequency domain signal via Fast Fourier Transform on the uplink signal. Multiplexing / demultiplexing unit 211b separates the uplink channels, such as the Physical Uplink Shared Channel (PUSCH) and Physical Uplink Control Channel (PUCCH), as well as the uplink reference signal, from the signal output from radio receiver 211a. Demodulation unit 211c uses modulation methods such as Binary Phase Shift Keying (BPSK) or Quadrature Phase Shift Keying (QPSK) to demodulate the received signal of the uplink channel modulation symbols. The modulation method used by demodulation unit 211c can be 16-QAM, 64QAM, or 256QAM. 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 control unit 24.

[0190] The transmission processing unit 212 performs downlink control information and downlink data transmission processing. The transmission processing unit 212 includes an encoding unit 212a, a modulation unit 212b, a multiplexing unit 212c, and a radio transmission unit 212d.

[0191] Encoding unit 212a encodes the downlink control information and downlink data input from control unit 24 using encoding methods such as block coding, convolutional coding, or turbo coding. In the case of NR, encoding unit 212a can encode using polarity coding or low-density parity-check (LDPC) coding. Modulation unit 212b modulates the coded bits output from encoding unit 212a using predetermined modulation methods such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. Multiplexing unit 212c multiplexes the modulation symbols and downlink reference signals for each channel and arranges the multiplexed modulation symbols and downlink reference signals in predetermined resource elements. Radio transmission unit 212d performs various signal processing on the signals from multiplexing unit 212c. For example, radio transmission unit 212d performs processing such as converting to the time domain via fast Fourier transform, adding guard intervals, generating baseband digital signals, converting to analog signals, quadrature modulation, up-conversion, removal of extra frequency components, and power amplification. The signal generated by the transmission processing unit 212 is transmitted from the antenna 213.

[0192] Storage unit 22 is a storage device such as DRAM, SRAM, flash memory, and hard disk that is capable of reading and writing data. Storage unit 22 serves as a storage device for base station equipment 20.

[0193] Network communication unit 23 is a communication interface for communicating with other devices (e.g., management device 10, other base station devices 20, base station devices 30, cloud server devices CS, etc.). Network communication unit 23 has the function of directly or indirectly connecting to network N1. For example, network communication unit 23 includes a LAN interface such as a NIC. Furthermore, network communication unit 23 can be a wired interface or a wireless interface. Network communication unit 23 serves as a network communication device for base station device 20. Network communication unit 23 communicates with other devices (e.g., management device 10, cloud server devices CS, etc.) under the control of control unit 24. The configuration of network communication unit 23 can be the same as the configuration of network communication unit 11 of management device 10.

[0194] Control unit 24 is a controller that controls each unit of base station equipment 20. Control unit 24 is implemented by a processor (hardware processor) such as a central processing unit (CPU) or a microprocessor unit (MPU). For example, control unit 24 can be implemented using random access memory (RAM) or the like by allowing the processor to execute various programs stored in storage devices within base station equipment 20, which serve as the working area. Note that control unit 24 can also be implemented by integrated circuits such as application-specific integrated circuits (ASICs) or field-programmable gate arrays (FPGAs). CPUs, MPUs, ASICs, and FPGAs can all be considered as controllers.

[0195] Control unit 24 can be configured by dividing it into multiple functional blocks, each representing a function of control unit 24. These functional blocks can be software or hardware blocks. For example, each of these functional blocks can be a software module implemented by software (including microprograms) or a circuit block on a semiconductor chip (die). Of course, each functional block can be a processor or an integrated circuit. The method of configuring the functional blocks is arbitrary. Note that the operation of control unit 24 will be described in detail later.

[0196] <2-4. Configuration of Base Station Equipment (Infrastructure)>

[0197] Next, the configuration of base station device 30 will be described. Base station device 30 is a wireless communication device that communicates wirelessly with mobile device 50. Base station device 30 functions as, for example, a radio base station, radio relay station, or radio access point. In this case, base station device 30 can be a road-based base station device such as an RSU, or an optical suspension device such as an RRH. As described above, base station device 30 is a device that constitutes the infrastructure in V2I communication.

[0198] Figure 19 This is a diagram illustrating a configuration example of a base station device 30 according to an embodiment of the present disclosure. The base station device 30 includes a radio communication unit 31, a storage unit 32, a network communication unit 33, and a control unit 34. Note that... Figure 19 The configuration shown is a functional configuration, and the hardware configuration may differ. Furthermore, the functions of base station equipment 30 can be distributed and installed in multiple physically separate configurations.

[0199] The radio communication unit 31 is a radio communication interface for wireless communication with other radio communication devices (e.g., mobile device 50, base station device 20, other base station devices 30). The radio communication unit 31 operates under the control of the control unit 34. The radio communication unit 31 includes a receiving processing unit 311, a transmitting processing unit 312, and an antenna 313. The configuration of the radio communication unit 31 (receiving processing unit 311, transmitting processing unit 312, and antenna 313) is the same as that of the radio communication unit 21 (receiving processing unit 211, transmitting processing unit 212, and antenna 213) of the base station device 20.

[0200] Storage unit 32 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, and hard disk. Storage unit 32 serves as a storage device for base station equipment 30. The configuration of storage unit 32 is the same as that of storage unit 22 in base station equipment 20.

[0201] The network communication unit 33 is a communication interface used to communicate with other devices (e.g., management device 10, other base station devices 20, base station device 30, cloud server device CS, etc.). The network communication unit 33 has the function of directly or indirectly connecting to network N1. For example, the network communication unit 33 includes a LAN interface such as a NIC. Furthermore, the network communication unit 33 can be a wired interface or a wireless interface. The network communication unit 33 serves as a network communication device for base station device 30. The configuration of the network communication unit 33 is the same as that of the network communication unit 23 of base station device 20.

[0202] Control unit 34 is a controller that controls each unit of base station equipment 30. Control unit 34 is implemented using a processor such as a CPU or MPU. For example, control unit 34 can be implemented using RAM, etc., by allowing the processor to execute various programs stored in storage devices within the base station equipment 30, which serves as the working area. Note that control unit 34 can also be implemented using integrated circuits such as ASICs or FPGAs. CPUs, MPUs, ASICs, and FPGAs can all be considered as controllers.

[0203] Control unit 34 can be configured by dividing it into multiple functional blocks, each representing a function of control unit 34. These functional blocks can be software or hardware blocks. For example, each of these functional blocks can be a software module implemented by software (including microprograms) or a circuit block on a semiconductor chip (die). Of course, each functional block can be a processor or an integrated circuit. The method of configuring the functional blocks is arbitrary. Note that the operation of control unit 34 will be described in detail later. Furthermore, the operation of control unit 34 can be the same as that of control unit 24 described above.

[0204] <2-5. Terminal Equipment Configuration>

[0205] Next, the configuration of terminal device 40 will be described. Terminal device 40 is a mobile radio communication device. For example, terminal device 40 may be a user terminal (UE: user equipment) such as a mobile phone or a smart device. Terminal device 40 can wirelessly communicate with base station device 20 or base station device 30. In addition, terminal device 40 is capable of sidelink communication with mobile device 50 and other terminal devices 40.

[0206] Figure 20 This is a diagram illustrating a configuration example of a terminal device 40 according to an embodiment of the present disclosure. The terminal device 40 includes a radio communication unit 41, a storage unit 42, a network communication unit 43, an input / output unit 44, and a control unit 45. Note that... Figure 20The configuration shown is a functional configuration, and the hardware configuration may differ. Furthermore, the functions of terminal device 40 can be distributed and installed in multiple physically separate configurations. Additionally, in the configuration of terminal device 40, network communication unit 53 and input / output unit 44 are not necessarily essential components.

[0207] Radio communication unit 41 is a radio communication interface for wireless communication with other radio communication devices (e.g., base station device 20 and base station device 30). Radio communication unit 41 operates under the control of control unit 45. Radio communication unit 41 corresponds to one or more radio access methods. For example, radio communication unit 41 supports both NR and LTE. In addition to NR and LTE, radio communication unit 41 may also support W-CDMA or cdma2000. Furthermore, radio communication unit 41 may support communication using NOMA.

[0208] The radio communication unit 41 includes a receiving processing unit 411, a transmitting processing unit 412, and an antenna 413. The radio communication unit 41 may include multiple receiving processing units 411, transmitting processing units 412, and antennas 413. When the radio communication unit 41 corresponds to multiple radio access methods, each part of the radio communication unit 41 can be configured separately for each radio access method. For example, the receiving processing unit 411 and the transmitting processing unit 412 can be configured using LTE and NR, respectively.

[0209] The receiving processing unit 411 processes the downlink signal received via the antenna 413. The receiving processing unit 411 includes a radio receiving unit 411a, a multiplexing and demultiplexing unit 411b, a demodulation unit 411c, and a decoding unit 411d.

[0210] Radio receiving unit 411a performs down-conversion, removal of unnecessary frequency components, control of amplification level, quadrature demodulation, conversion to digital signal, removal of guard interval, and extraction of frequency domain signal through fast Fourier transform on the downlink signal. Multiplexing and demultiplexing unit 411b separates the downlink channel, downlink synchronization signal, and downlink reference signal from the signal output from radio receiving unit 411a. The downlink channel is, for example, a channel such as Physical Broadcast Channel (PBCH), Physical Downlink Shared Channel (PDSCH), and Physical Downlink Control Channel (PDCCH). Demodulation unit 211c uses modulation methods such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM to demodulate the received signal of the downlink channel modulation symbols. Decoding unit 411d performs decoding processing on the coded bits of the demodulated downlink channel. The decoded downlink data and downlink control information are output to control unit 45. The downlink synchronization signal may include an SSB (SS / PBCH block). The downlink reference signal may include CSI-RS and DMRS.

[0211] The transmission processing unit 412 performs uplink control information and uplink data transmission processing. The transmission processing unit 412 includes an encoding unit 412a, a modulation unit 412b, a multiplexing unit 412c, and a radio transmission unit 412d.

[0212] Encoding unit 412a encodes the uplink control information and uplink data input from control unit 45 using encoding methods such as block coding, convolutional coding, or turbo coding. Note that in the case of NR, encoding unit 412a can encode using polarity coding or low-density parity-check (LDPC) coding. Modulation unit 412b modulates the coded bits output from encoding unit 412a using predetermined modulation methods such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. Multiplexing unit 412c multiplexes the modulation symbols and uplink reference signals of each channel and arranges the multiplexed modulation symbols and downlink reference signals in predetermined resource elements. Radio transmission unit 412d performs various signal processing on the signals from multiplexing unit 412c. For example, radio transmission unit 412d performs processes such as converting to the time domain via inverse fast Fourier transform, adding guard intervals, generating baseband digital signals, converting to analog signals, quadrature modulation, up-conversion, removal of extra frequency components, and power amplification. The signal generated by the transmission processing unit 412 is transmitted from the antenna 413.

[0213] Storage unit 42 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, and hard disk. Storage unit 42 serves as a storage device for terminal device 40.

[0214] Network communication unit 43 is a communication interface used for communicating with other devices. For example, network communication unit 43 is a LAN interface such as a NIC. Network communication unit 43 has the function of directly or indirectly connecting to network N1. Network communication unit 43 can be a wired interface or a wireless interface. Network communication unit 43 serves as a network communication device for terminal device 40. Network communication unit 43 communicates with other devices under the control of control unit 45.

[0215] Input / output unit 44 is a user interface for exchanging information with a user. For example, input / output unit 44 may be an operating device for the user to perform various operations, such as a keyboard, mouse, operation keys, and touch panel. Alternatively, input / output unit 44 may be a display device such as a liquid crystal display (LCD) or an organic electroluminescent display (OLED). Input / output unit 44 may be an audio device such as a speaker or buzzer. Furthermore, input / output unit 44 may be a lighting device such as a light-emitting diode (LED) lamp. Input / output unit 44 serves as an input / output device (input device, output device, operating device, or notification device) for terminal device 40.

[0216] Control unit 45 is a controller that controls each unit of terminal device 40. Control unit 45 is implemented by a processor such as a CPU or MPU. For example, control unit 45 can be implemented using RAM, etc., by allowing the processor to execute various programs stored in a storage device inside terminal device 40, which serves as the working area. Note that control unit 45 can also be implemented by an integrated circuit such as an ASIC or FPGA. CPU, MPU, ASIC, and FPGA can all be considered as controllers.

[0217] The control unit 45 can be configured by dividing it into multiple functional blocks, each representing a function of the control unit 45. These functional blocks can be software or hardware blocks. For example, each of the aforementioned functional blocks can be a software module implemented by software (including microprograms) or a circuit block on a semiconductor chip (die). Of course, each functional block can be a processor or an integrated circuit. The method of configuring the functional blocks is arbitrary. Note that the operation of the control unit 45 will be described in detail later.

[0218] <2-6. Mobile Device Configuration>

[0219] Next, the configuration of mobile device 50 will be described. Mobile device 50 is a mobile radio communication device. For example, mobile device 50 is a vehicle such as a car or a radio communication device installed in a vehicle. Mobile device 50 can be a mobile terminal device such as a mobile phone or a smart device. Mobile device 50 can wirelessly communicate with base station device 20 or base station device 30. In addition, mobile device 50 is capable of sidelink communication with terminal device 40 and other mobile devices 50.

[0220] Figure 21 This is a diagram illustrating an example configuration of a mobile device 50 according to an embodiment of the present disclosure. The mobile device 50 includes a radio communication unit 51, a storage unit 52, a network communication unit 53, an input / output unit 54, and a control unit 55. Note that... Figure 21 The configuration shown is a functional configuration, and the hardware configuration may differ. Furthermore, the functionality of the mobile device 50 may be distributed and installed in multiple physically separate configurations.

[0221] Radio communication unit 51 is a radio communication interface for wireless communication with other radio communication devices (e.g., base station device 20 and base station device 30). Radio communication unit 51 operates under the control of control unit 55. Radio communication unit 51 corresponds to one or more radio access methods. For example, radio communication unit 51 may support both NR and LTE. In addition to LTE, radio communication unit 51 may also support W-CDMA or cdma2000. Furthermore, radio communication unit 51 supports communication using NOMA.

[0222] The radio communication unit 51 includes a receiving processing unit 511, a transmitting processing unit 512, and an antenna 513. The radio communication unit 51 may include multiple receiving processing units 511, transmitting processing units 512, and antennas 513. When the radio communication unit 51 corresponds to multiple radio access methods, each part of the radio communication unit 51 can be configured separately for each radio access method. For example, the receiving processing unit 511 and the transmitting processing unit 512 may be configured as LTE and NR, respectively.

[0223] The receiving processing unit 511 processes the downlink signal received via the antenna 513. The receiving processing unit 511 includes a radio receiving unit 511a, a multiplexing and demultiplexing unit 511b, a demodulation unit 511c, and a decoding unit 511d.

[0224] Radio receiving unit 511a performs down-conversion, removal of unnecessary frequency components, control of amplification level, quadrature demodulation, conversion to digital signal, removal of guard interval, and extraction of frequency domain signal through fast Fourier transform on the downlink signal. Multiplexing and demultiplexing unit 511b separates the downlink channel, downlink synchronization signal, and downlink reference signal from the signal output from radio receiving unit 511a. The downlink channel is, for example, a channel such as PBCH, PDSCH, or PDCCH. Demodulation unit 211c uses modulation methods such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM to demodulate the received signal of the downlink channel modulation symbols. Decoding unit 511d performs decoding processing on the coded bits of the demodulated downlink channel. The decoded downlink data and downlink control information are output to control unit 55.

[0225] The transmission processing unit 512 performs uplink control information and uplink data transmission processing. The transmission processing unit 512 includes an encoding unit 512a, a modulation unit 512b, a multiplexing unit 512c, and a radio transmission unit 512d.

[0226] Encoding unit 512a encodes the uplink control information and uplink data input from control unit 55 using encoding methods such as block coding, convolutional coding, or turbo coding. Modulation unit 512b modulates the coded bits output from encoding unit 512a using predetermined modulation methods such as BPSK, QPSK, 16QAM, 64QAM, or 256QAM. Multiplexing unit 512c multiplexes the modulation symbols and uplink reference signals for each channel and arranges the multiplexed modulation symbols and downlink reference signals in predetermined resource elements. Radio transmission unit 512d performs various signal processing on the signals from multiplexing unit 512c. For example, radio transmission unit 512d performs processes such as converting to the time domain via inverse fast Fourier transform, adding guard intervals, generating baseband digital signals, converting to analog signals, quadrature modulation, up-conversion, removal of extra frequency components, and power amplification. The signal generated by transmission processing unit 512 is transmitted from antenna 513.

[0227] Storage unit 52 is a storage device capable of reading and writing data, such as DRAM, SRAM, flash memory, and hard disk. Storage unit 52 is used as a storage device for mobile device 50.

[0228] The network communication unit 53 is a communication interface used 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 the function of directly or indirectly connecting to network N1. The network communication unit 53 can be a wired interface or a wireless interface. The network communication unit 53 serves as a network communication device for the mobile device 50. The network communication unit 53 communicates with other devices under the control of the control unit 55. In the configuration of the terminal device 40, the network communication unit 53 is not necessarily an essential component.

[0229] The input / output unit 54 is a user interface for exchanging information with the user. For example, the input / output unit 54 may be an operating device for the user to perform various operations, such as a keyboard, mouse, operation keys, and touch panel. Alternatively, the input / output unit 54 may be a display device such as a liquid crystal display (LCD) or an organic EL display. The input / output unit 54 may be an audio device such as a speaker or buzzer. Furthermore, the input / output unit 54 may be a lighting device such as an LED light. The input / output unit 54 serves as an input / output device (input device, output device, operating device, or notification device) for the mobile device 50. Note that the input / output unit 54 is not necessarily an essential component in the configuration of the terminal device 40.

[0230] Control unit 55 is a controller that controls each unit of mobile device 50. Control unit 55 is implemented by a processor (hardware processor) such as a CPU or MPU. For example, control unit 55 can be implemented using RAM, etc., by allowing the processor to execute various programs stored in a storage device within mobile device 50, which serves as the workspace. Note that control unit 55 can also be implemented by an integrated circuit such as an ASIC or FPGA. CPU, MPU, ASIC, and FPGA can all be considered as controllers.

[0231] Control unit 55 can be configured by dividing it into multiple functional blocks, which represent each function of control unit 24. The functional blocks of control unit 55 can be software blocks or hardware blocks. For example, each of the aforementioned functional blocks can be a software module implemented by software (including microprograms) or a circuit block on a semiconductor chip (die). Of course, each functional block can be a processor or an integrated circuit. The method of configuring the functional blocks is arbitrary. Note that the operation of control unit 55 will be described in detail later.

[0232] Note that mobile device 50 may have mobility functionality. For example, mobile device 50 may have a power unit such as an engine and can move by its own power. Note that mobile device 50 does not necessarily have mobility functionality. In this case, mobile device 50 may be a device additionally attached to a device with mobility functionality (e.g., a vehicle such as a car). For example, mobile device 50 may be a navigation system device additionally attached to a car.

[0233] <<3. Operation of Information Processing Systems>>

[0234] Next, an operational example of the information processing system according to the embodiment will be described. Note that "base station" as shown below refers to a base station including the base station device 20 or base station device 30 described above. Additionally, "terminal device" as shown below refers to the terminal device 40 or mobile device 50 described above. 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. Furthermore, 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.

[0235] In this embodiment, (1) to (3) are newly constructed so that the terminal device can perform side link communication using the NR timeslot format. The details of these (1) to (3) will be described in turn.

[0236] (1) New design of time slot format

[0237] (2) Method for configuring time slot format

[0238] (3) Methods for changing the time slot format (rewriting symbols)

[0239] <3-1.(1) New Design of Time Slot Format>

[0240] In this embodiment, in NR V2X communication, the base station redesigns the time slot format for performing sidelink communication. Specifically, the base station redesigns the time slot format according to the methods shown in (1A) and (1B) below.

[0241] (1A) Method for defining new symbols for sidelink communication

[0242] (1B) Method using existing symbols for side link communication

[0243] [1A: A method for defining new symbols for sidelink communication]

[0244] Base stations can configure four states—uplink communication symbol, downlink communication symbol, flexible symbol, and sidelink communication symbol—as the state of each symbol in the time slot format by defining new symbols for sidelink communication. When configuring a new symbol for sidelink communication, it can be configured using the following three methods.

[0245] (1A-1) is a symbol that can only be used for side link communication.

[0246] (1A-2) A symbol capable of selectively performing sidelink or uplink communication; (1A-3) A symbol capable of performing both sidelink and uplink communication simultaneously.

[0247] [1A-1: Symbol that can only be used for side link communication]

[0248] First, we will describe the method for defining symbols that can only be used for side link communication. Figure 22 This is a diagram illustrating an example of a timeslot format including symbols used for performing sidelink communication. Figure 22 In the slot format shown, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are sidelink symbols (S). When using Figure 22 In the timeslot format shown, the terminal device uses the first to fourth symbols in the timeslot for downlink communication and the fifth to seventh symbols for sidelink communication. That is, in Figure 22 In the case of the time slot format shown, only side link communication can be performed in symbols 5 to 7, and neither downlink nor uplink communication can be performed.

[0249] [1A-2: Symbol for selectively performing either sidelink or uplink communication]

[0250] Second, a method will be described to define symbols capable of selectively performing sidelink or uplink communication. Figure 23 This is a diagram illustrating an example of a timeslot format including symbols used for performing sidelink communication. Figure 23 In the slot format shown, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols (U) or sidelink symbols (S). When using... Figure 23 In the timeslot format shown, the terminal device uses the first to fourth symbols in the timeslot for downlink communication and the fifth to seventh symbols for uplink or sidelink communication. That is, in Figure 23In the time slot format shown, for symbols 5 through 7, each symbol can be selected for either uplink or sidelink communication. Note that the choice between uplink and sidelink communication can be specified by the base station or determined by the terminal device. Figure 23 The fifth to seventh symbols shown cannot be used for downlink communication.

[0251] [1A-3: Symbol that can perform both sidelink and uplink communication simultaneously]

[0252] Third, a method for defining symbols capable of performing both sidelink and uplink communication simultaneously will be described. Figure 24 This is a diagram illustrating an example of a timeslot format including symbols used for performing sidelink communication. Figure 24 In the slot format shown, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols (U) and sidelink symbols (S). When using... Figure 24 In the timeslot format shown, the terminal device uses symbols one through four of the timeslot for downlink communication and symbols five through seven to simultaneously perform uplink or sidelink communication. In symbols five through seven, uplink and sidelink communication can be configured to different resource elements (i.e., different subcarriers) or the same resource element. When uplink and sidelink communication are configured in the same resource element, for example, code multiplexing (Code Division Multiple Access (CDMA) and Interleaved Multiple Access (IDMA)) or spatial multiplexing can be performed. Note that... Figure 24 The fifth to seventh symbols shown cannot be used for downlink communication.

[0253] Note that the time slot formats described in (1A-1) through (1A-3) are examples. For instance, a time slot format could exist that includes all the symbols newly defined in (1A-1) through (1A-3). That is, within the same time slot, all symbols (S) dedicated to lateral link communication, symbols (U / S) capable of selecting uplink or lateral link communication, and symbols (U and S) capable of performing both uplink and lateral link communication simultaneously could be included.

[0254] [1B: Method using existing symbols for sidelink communication]

[0255] Next, we will describe a method for using existing symbols for sidelink communication. In other words, in (1A) above, the symbols for sidelink communication are newly defined, but in (1B), the symbols for sidelink communication are not newly defined. There are two methods for using existing symbols for sidelink communication.

[0256] (1B-1) The symbol for uplink communication is used for sidelink communication.

[0257] (1B-2) Flexible symbols are used for sidelink communication.

[0258] [1B-1: Using symbols for uplink communication as symbols for sidelink communication]

[0259] First, we will describe the case where the symbols for uplink communication are used for sidelink communication. Figure 25 This is a diagram illustrating an example of a timeslot format including symbols used for performing sidelink communication. Figure 25 In the timeslot format shown, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are uplink symbols ("(U)") capable of enabling side-link communication. When using... Figure 25 When the time slot format is shown, the terminal device performs downlink communication using the first to fourth symbols in the time slot, and performs any of the following (a) to (c) communications using the fifth to seventh symbols.

[0260] (a) Side link communication

[0261] (b) Uplink communication

[0262] (c) Performing both sidelink and uplink communication simultaneously

[0263] Note that the base station notifies the terminal device which of the communications described in (a) to (c) above will be performed by the terminal device, and a specific example of such notification will be described later.

[0264] [(1B-2): Using flexible symbols for side link communication]

[0265] Secondly, the use of flexible symbols for side link communication will be described. Figure 26 This is a diagram illustrating an example of a timeslot format including symbols used for performing sidelink communication. Figure 26 In the timeslot format shown, the first to fourth symbols are downlink symbols (D), and the fifth to seventh symbols are flexible symbols ("(F)") enabling side-link communication. When using... Figure 26 When the time slot format is shown, the terminal device performs downlink communication using the first to fourth symbols in the time slot, and performs any of the following (a) to (d) communications using the fifth to seventh symbols.

[0266] (a) Side link communication

[0267] (b) Uplink communication

[0268] (c) Downlink communication

[0269] (d) Perform both sidelink and uplink communication simultaneously.

[0270] Note that the base station notifies the terminal device which of the communications described in (a) to (d) above to perform, and a specific example of such notification will be described later.

[0271] <3-2.(2) Methods for configuring time slot formats (time slot configuration)>

[0272] [Methods for configuring time slot format]

[0273] Next, the methods for configuring the timeslot format will be described. The timeslot format configuration is performed from the base station onto the terminal device. There are two methods for configuring the timeslot format.

[0274] (2A) Method for configuring time slot format for each cell (from the base station's perspective)

[0275] (2B) Method for configuring time slot format for each terminal

[0276] [2A: Method for configuring time slot format for each cell]

[0277] First, a method for configuring the timeslot format for each cell (from the base station's perspective) will be described. In this case, the base station configures the same timeslot format for all terminal devices existing in the same cell. Specifically, the base station can configure the timeslot format for each cell using one of three methods.

[0278] (2A-1) Configuration via RRC signaling

[0279] (2A-2) Configuration via group public PDCCH

[0280] (2A-3) Configuration combined with RRC signaling and PDCCH (including group common) (Downlink Control Information (DCI))

[0281] [(2B) Method for configuring time slot format for each terminal]

[0282] Secondly, a method for configuring the timeslot format for each terminal will be described. In this case, the base station configures the timeslot format for each terminal device present in the cell. Specifically, the base station can configure the timeslot format for each terminal using one of the following three methods.

[0283] (2B-1) Configuration via UE-specific RRC signaling (dedicated signaling)

[0284] (2B-2) Configuration via PDCCH (DCI)

[0285] (2B-3) Configuration combined with RRC signaling and PDCCH (Downlink Control Information (DCI))

[0286] Note that when configuring the timeslot format for each terminal, the configuration method can be further divided into the following two methods.

[0287] (2B-A) When multiple cells are configured in the same UE, for each cell

[0288] (2B-B) When multiple BWPs are configured in at least one cell, for each BWP

[0289] [Notification content sent to the terminal]

[0290] When the base station notifies the terminal device of the timeslot format configuration, the notification content differs in the following two modes. The notification content in each mode will be described in detail below.

[0291] (Mode 1) When defining a new symbol for sidelink communication

[0292] (Mode 2) When using existing symbols for sidelink communication

[0293] [(Mode 1) When defining new symbols for sidelink communication]

[0294] The notification content when defining new symbols for sidelink communication will be described. In this case, firstly, the base station generates a new time slot format including symbols for sidelink communication according to the definition shown in (1A) above. Alternatively, a new time slot format including symbols for sidelink communication is defined in 3GPP, etc., and the base station uses the index corresponding to each time slot format as time slot format information. For example, the newly generated time slot format information is information indicating the state pattern of 14 symbols when the number of symbols in a time slot is 14. Specifically, the base station stores the list of symbol patterns in the time slot format as table information and adds the newly generated time slot format information to the table information. More specifically, there is a reserved information area in the table information, and the newly generated time slot format is added to the reserved information area. Furthermore, more specifically, when the table information consists of formats from 0 to 255 (256), the range from 56 to 254 is the reserved information area (format), and the newly generated time slot format is written to any one of 56 to 254. In other words, one of the 56 to 254 time slot formats is assigned to the newly generated time slot format.

[0295] Then, when the base station configures the newly generated timeslot format (or timeslot format information) for each cell, it notifies (configures) the new timeslot format to all terminal devices present in the cell through RRC signaling, PDCCH (DCI) or a combination of RRC signaling and PDCCH (DCI), through the methods described above (2A-1) to (2A-3), that is, through any one of the methods of RRC signaling, PDCCH (DCI) or a combination of RRC signaling and PDCCH (DCI).

[0296] In this scenario, the base station can notify the terminal device of the status of each symbol exactly as it is in the newly generated timeslot format. Specifically, when the base station generates a new timeslot... Figure 22 When the time slot format is as shown, the base station notifies the terminal device of the information indicating the time slot format "DDDDSSS". That is, the base station notifies the terminal device of the information regarding the arrangement of symbols in the time slot format. Alternatively, the base station may also notify the terminal device of the corresponding format number (e.g., in the range of 56 to 254) to inform the terminal device of the newly generated time slot format.

[0297] Note that the base station can notify the assigned slot format combination ID and the status of the symbols within it. That is, when multiple slot formats are pre-configured via RRC signaling, the base station generates one or more slot format combinations including one or more slot formats and configures an ID for each slot format combination. This ID (SlotFormatCombinationID) can be notified to the terminal device.

[0298] Alternatively, the base station can notify the terminal device by including the newly generated timeslot format (or timeslot format information) in the aforementioned TDD configuration information (TDD-UL-DL-ConfigurationCommon). Furthermore, or alternatively, the aforementioned TDD configuration information can be extended to notify the terminal device of the generated new timeslot format. For example, TDD-UL-DL-ConfigurationCommon could be renamed TDD-UL-DL-SL-ConfigurationCommon.

[0299] Additionally, when the base station configures a newly generated timeslot format for each terminal, the base station individually notifies (configures) each terminal device of the newly generated timeslot format through methods described above (2B-1) to (2B-3), namely, through any one of UE-specific RRC signaling (dedicated signaling), PDCCH (DCI), or a combination of RRC signaling and PDCCH (DCI). In this case, the base station may also notify the terminal device of the status of each symbol in the newly generated timeslot format as is, or it may notify the corresponding format number (range 56-254) to notify the terminal device of the newly generated timeslot format. Furthermore, the base station may notify the terminal device of the assigned timeslot format combination ID and information about the status of the symbols arranged within it. That is, when multiple SlotFormats are pre-configured via RRC signaling, the base station generates one or more timeslot format combinations including one or more SlotFormats and configures an ID for each timeslot format combination. The ID (timeslot format combination ID) can be notified to the terminal device.

[0300] Alternatively, the base station can notify the terminal device by including the newly generated timeslot format (or timeslot format information) in the aforementioned TDD configuration information (TDD-UL-DL-ConfigDedicated). Alternatively, the aforementioned TDD configuration information can be extended to notify the terminal device of the generated new timeslot format. For example, TDD-UL-DL-ConfigDedicated could be renamed TDD-UL-DL-SL-ConfigDedicated.

[0301] [(Mode 2) When using existing symbols for sidelink communication]

[0302] Next, we will describe the notification content for using existing symbols for sidelink communication. When using existing symbols for sidelink communication, the base station may need to notify the terminal device of the following two points.

[0303] (A) Inform which existing symbols will be used for sidelink communication

[0304] (B) Symbols that can be used for side link communication are used to notify what kind of communication.

[0305] As the notification (configuration) methods described in (A) and (B) above, notification (configuration) can be performed through any one of the following two methods or a combination thereof.

[0306] • Define the method for new RRC configuration and notification

[0307] • New definition and notification method for DCI in cross-link communication

[0308] [(A) Inform which existing symbol is used for sidelink communication]

[0309] The base station needs to notify (configure) the terminal device which existing symbol (which uplink symbol or flexible symbol) will be used for sidelink communication in the time slot format configured for the terminal device. When making this notification (configuration), the base station can do so via, for example, a bitmap.

[0310] Specifically, for example, suppose the current timeslot format is "FFFFUUUUUFFFUU". For instance, when the base station indicates that the first to fourth flexible symbols are available for sidelink communication, the base station will configure the bitmap "11110000000000" to notify the terminal device. Upon receiving this notification, the terminal device can use the first to fourth flexible symbols of the timeslot format "FFFFUUUUUFFFUU" for sidelink communication. Note that, along with the aforementioned bitmap "11110000000000", the base station can notify (configure) the timeslot format associated with the timeslot format number or timeslot format combination ID. As a result, it can be understood that the terminal device corresponds to the bitmap "11110000000000" and the timeslot format "FFFFUUUUUFFFUU".

[0311] [(B) Notification regarding which symbols can (or may be) used for side link communication and for which type of communication]

[0312] When existing symbols are used for lateral link communication, as shown in (1B) above, the base station needs to inform (configure) the terminal device which of the following will be performed: lateral link communication only, uplink communication only, lateral link communication, and simultaneous uplink communication. In other words, the base station needs to indicate whether symbols that can also be used for lateral link communication will be used only for lateral link communication or used together for both lateral link communication and uplink communication.

[0313] When making this notification, the base station can do so via, for example, a bitmap. Specifically, when the base station uses the first and second symbols of the time slot format "FFFFUUUUUFFFUU" only for lateral link communication, and uses the third and fourth symbols together in both lateral link and uplink communication, the base station notifies the terminal device of the bitmap "1100xxxxxxxxxxx". Note that the "x" in the bitmap above indicates that any value of 0 or 1 can be used. As a result, in the time slot format "FFFFUUUUUFFFUU", the terminal device can use only the first and second symbols for lateral link communication, and use the third and fourth symbols for simultaneous lateral link and uplink communication.

[0314] Note that in this case, the timeslot format number or timeslot format combination ID can be associated with the bitmap "1100xxxxxxxxxxx". As a result, it can be understood that the terminal device corresponds to "1100xxxxxxxxxxx" and the timeslot format "FFFFUUUUUFFFUU".

[0315] Note that the notification method using bitmaps has been described above as an example. In addition to the bitmap notification method described above, for example, the symbol number (nbr-symbol) and the possible communication type of the symbol (type_symbol) can be associated with each symbol in the time slot format and notified to the terminal device. For example, when indicating that the fifth symbol is to be used for lateral link communication, information associated with nbr_symbol "0101" and type_symbol "1" (a bit value indicating that the symbol for lateral link communication is assumed to be "1") is notified to the terminal device. Upon receiving this notification, the terminal device can use the fifth symbol in the time slot format for lateral link communication.

[0316] Next, we will use the TDD configuration information (TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated) as examples to describe a more detailed example of configuration notification. For example, in addition to the information (1) to (5) above, the TDD configuration information may also include the following information (6) and (7) regarding sidelink communication.

[0317] (6) Location and number of side link symbols

[0318] (7) All side links for each symbol (all side links)

[0319] Note that for (6) above, it can be notified as sequence information of side link symbols, or it can be sequence information of a bitmap. More specifically, it can be used as follows: Figure 27 The message structure shown is (ASN.1). Figure 27 This is a diagram illustrating an example of a configuration notification. Note that in Figure 27In the text, the bold underlined portion indicates information elements (information elements) that take into account the new regulations to notify terminal devices of sidelink communication information. For example, a new “pattern3” (TDD-SL mode) can be specified in TDD-UL-DL-ConfigurationCommon. In “TDD-SL mode”, IE can select (make a selection) “symbol” and “bitmap” as mode types. When “bitmap” is selected, “oneSlot” and “twoSlot” can be configured by “symbolBitmapsForSlotFormat”. “symbolBitmapsForSlotFormat” can indicate the bitmap mentioned above by “oneSlot” or “twoSlot”. On the other hand, when “symbol” is selected as the mode type, “nrofSidelinkSymbols” can be configured. Here, “nrofSidelinkSymbols” corresponds to “number of sidelink symbols” in the position and number of sidelink symbols mentioned above (6).

[0320] In addition, "allSidelink" can be newly specified in the "Symbols" section of TDD-UL-DL-ConfigDedicated. Furthermore, "nrofSidelinkSymbols" can be newly specified in the "explicit" section of the same "Symbols".

[0321] Here, "nrofSidelinkSymbols" can be defined as follows: "nrofSidelinkSymbols" represents the number of consecutive side-link symbols starting from the last subsequent symbol of the downlink symbol specified by nrofDownlinkSymbols. Here, depending on the UE's configuration and capabilities, consecutive side-link symbols may or may not overlap with some consecutive uplink symbols.

[0322] Furthermore, the aforementioned "symbolBitmapsForSlotFormat" can be defined as follows: "symbolBitmapsForSlotFormat" represents a bitmap symbol pattern used to define one or more sidelink symbols in one or two time slots. This bitmap symbol pattern maps to the uplink or downlink TDD configuration configured on the UE (e.g., the time slot format described above).

[0323] <3-3.(3) Methods for changing the time slot format>

[0324] In section (1) above, a case is shown where the design includes a new timeslot format for symbols used in lateral link communication. Additionally, section (2) above shows a case where existing symbols are used for lateral link communication. Section (3) above will describe a case where the timeslot format of a symbol is changed. Note that changing a symbol can also be referred to as symbol reconfiguration or symbol rewriting.

[0325] First, operational examples of base stations and terminal equipment when changing the symbols in a time slot format will be described. Specifically, the following two types of operational examples of base stations and terminal equipment when changing the symbols in a time slot format can be considered.

[0326] (3A) The base station determines the symbol change and instructs the terminal equipment to change the symbol.

[0327] (3B) The terminal device determines to change the symbol and changes the symbol.

[0328] [(3A) The base station determines the symbol to be changed and instructs the terminal equipment to change to that symbol.]

[0329] First, the base station can determine to change the symbol and instruct the terminal device to change the symbol. Four operational examples of the base station in this scenario can be considered. In each case, the operations of the base station and the terminal device will be described in detail.

[0330] (3A-1) Using DCI to change (reconfigure / rewrite) the time slot format configured by RRC signaling

[0331] (3A-2) Using RRC to change (reconfigure / rewrite) the time slot format configured in DCI

[0332] (3A-3) Using UE-specific RRC to change (reconfigure / rewrite) the time slot format configured in cell-specific RRC.

[0333] (3A-4) Utilize UE-specific DCI to change (reconfigure / rewrite) the slot format configured in the group common PDCCH.

[0334] When the base station notifies the terminal device of the timeslot format configuration using the methods shown in (3A-1) to (3A-4), and the predetermined information sent from the terminal device satisfies the predetermined rewrite conditions, it instructs the symbol rewrite in the configured timeslot format using the methods shown in (3A-1) to (3A-4). Note that the rewrite conditions are conditions for rewriting the symbol state, but the details of these conditions will be described later. Additionally, the predetermined information sent from the terminal device includes, for example, information such as channel congestion status (channel busy ratio (CBR)), the terminal device's traffic model, the service type and priority information of sidelink communication (priority information), interference levels, and resource usage status.

[0335] The operation of the base stations and terminal equipment in (3A-1) to (3A-4) will be described in detail below.

[0336] [3A-1: Using DCI to change the time slot format configured by RRC signaling]

[0337] (Base station operation)

[0338] In this scenario, for example, the base station uses DCI (Distributed Interchange Control) for sidelink communication to change the time slot format configured by RRC (Redirect Rate Control) signaling. Specifically, first, the base station configures the time slot format in the terminal equipment via RRC signaling. Note that the time slot format configured by RRC signaling can be one or more symbols from one or more time slots configured by TDD (Transmission Controlled Development) configuration information (TDD-UL-DL-ConfigurationCommon or TDD-UL-DL-ConfigDedicated). Furthermore, the time slot format configured by RRC signaling can be one or more time slot formats included in one or more SlotFormat combination IDs.

[0339] Subsequently, when the rewriting conditions described later are met, the base station determines the symbol rewriting 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 to be changed and the changed symbol status. Note that the details of the rewriting conditions will be described later.

[0340] (Operation of terminal equipment)

[0341] In case (3A-1), the terminal device first configures the time slot format notified by RRC signaling from the base station. Subsequently, when the base station notifies the symbol change via DCI communication through the side link, the terminal device rewrites the symbol state in the time slot format according to the notification content.

[0342] [3A-2: Using RRC to change the time slot format configured in DCI]

[0343] (Base station operation)

[0344] In this scenario, the base station first notifies the terminal device of one or more time slot formats via DCI format 2_0 of the SFI, which specifies one or more time slot formats (e.g., SlotFormatCombination). Subsequently, when the rewrite conditions described later are met, the base station determines the symbol rewrite and notifies the symbol change via, for example, a pre-defined RRC configuration (various configuration information described above, such as TDD configuration information). For instance, the base station notifies the terminal device of the symbol number to be changed, the time slot of the symbol to be changed, and the status of the changed symbol.

[0345] (Operation of terminal equipment)

[0346] In case (3A-2), the terminal device configures one or more slot formats (e.g., SlotFormatCombination) specified by the SFI in DCI format 2_0 transmitted from the base station. Subsequently, the terminal device rewrites the symbol state according to the RRC configuration from the base station. That is, it rewrites a specific symbol in the slot indicated by the RRC configuration so that it is in the changed symbol state indicated by the RRC configuration.

[0347] [(3A-3) Using UE-specific RRC to change (reconfigure / rewrite) the time slot format configured in cell-specific RRC]

[0348] (Base station operation)

[0349] In this scenario, the base station notifies the terminal devices present in the cell of the time slot format to be configured by the cell-specific RRC (e.g., TDD-UL-DL-ConfigurationCommon). Subsequently, when the rewrite conditions described below are met, the base station determines the symbol rewrite and individually notifies the terminal devices that should have their symbols rewritten using the UE-specific RRC (e.g., TDD-UL-DL-ConfigDedicated). For example, when using TDD-UL-DL-ConfigDedicated, the base station can be configured such that symbols used for sidelink communication are included in the multiple symbols to be configured. Alternatively, the base station can send TDD-UL-DL-ConfigDedicated to the terminal devices after sending TDD-UL-DL-ConfigurationCommon, which includes symbols for sidelink communication in its configuration. When the UE receives TDD-UL-DL-ConfigDedicated, if TDD-UL-DL-ConfigurationCommon has already been configured, the UE can use TDD-UL-DL-ConfigDedicated to reconfigure / rewrite its own configuration.

[0350] (Operation of terminal equipment)

[0351] In case (3A-3), the terminal device first configures the time slot format specified by TDD-UL-DL-ConfigurationCommon received from the base station. Next, when the rewrite conditions described later are met, the terminal device determines the symbol rewrite and performs the rewrite on the symbols in the time slots specified by TDD-UL-DL-ConfigDedicated, such that when TDD-UL-DL-ConfigDedicated is received from the base station, the symbol is in the state of the symbol specified in TDD-UL-DL-ConfigDedicated.

[0352] [3A-4: Use UE-specific DCI to change the slot format configured in the group common PDCCH]

[0353] (Base station operation)

[0354] In this scenario, the base station first notifies the terminal device of the slot format configured by the group common PDCCH. The slot format specified by the group common PDCCH can be one or more slot formats indicated by a SlotFormatCombination identified by a SlotFormat Combination ID corresponding to the SFI specified in DCI format 2_0. Subsequently, the base station notifies the symbol change via a UE-specific DCI. For example, the UE-specific DCI can be a DCI used for sidelink communication. That is, the symbols in one or more slot formats indicated by the SlotFormatCombination identified by a SlotFormat Combination ID corresponding to the SFI specified in DCI format 2_0 are reconfigured by the sidelink communication DCI. Note that the sidelink communication DCI here can include information indicating the symbol to be changed (rewritten), the slot containing the symbol, and the status of the changed symbol.

[0355] (Operation of terminal equipment)

[0356] In case (3A-4), the terminal device configures one or more time slot formats indicated by a SlotFormatCombination identified by a SlotFormat Combination ID corresponding to the SFI specified by the DCI format 2_0 received from the base station. Subsequently, the terminal device rewrites the symbols in the time slot formats based on the DCI used for side-link communication received from the base station. Note that the DCI used for side-link communication here may include information indicating the symbol to be changed (rewritten), the time slot including the symbol, and the state of the changed symbol.

[0357] [3B: The terminal device determines to change the symbol and changes the symbol]

[0358] Second, the terminal device can determine and change the symbol. In other words, instead of receiving instructions from the base station, the terminal device itself determines the symbol change. In this case, the operations of the base station and the terminal device are as follows. First, an example of the base station's operation is as follows.

[0359] (Base station operation)

[0360] The base station configures the rewrite conditions, described later, and notifies the terminal device. The base station notifies the terminal device of the rewrite conditions via, for example, RRC or DCI. Note that the base station may notify all terminal devices in the cell of the configured rewrite conditions, notify the configured rewrite conditions in a specific group element including multiple terminal devices in the cell, or notify the terminal devices individually. Note that, for example, when notifying terminal devices individually, a dedicated channel may be used for notification.

[0361] (Operation of terminal equipment)

[0362] When the communication-related information in the terminal device meets the rewriting conditions configured by the base station, the terminal device rewrites the symbols in the time slot format. Then, when the terminal device rewrites the symbol, it notifies the base station and other terminal devices that the symbol has been rewritten.

[0363] The terminal device notifies the base station that the symbol has been overwritten via, for example, PUCCH or PUSCH. Alternatively, the terminal device uses unoverwritten uplink symbols or flexible symbols from the time slot format to transmit PUCCH and PUSCH.

[0364] In addition, terminal devices notify other terminal devices, for example, via PSCCH, PSSCH, or PSFCH that the symbol has been overwritten. Terminal devices use the unoverwritten uplink symbols, flexible symbols, and sidelink symbols in the time slot format to send PSCCH, PSSCH, or PSFCH.

[0365] Note that other terminal devices receiving this notification may or may not need to rewrite their own timeslot format symbols to perform sidelink communication with the terminal devices. For example, when other terminal devices are outside the base station's cell, the terminal rewrites its current timeslot format with the new timeslot format notified by the terminal device and performs communication using the new timeslot format. This enables sidelink communication with terminal devices even when the base station cannot communicate with other terminal devices.

[0366] Furthermore, when a terminal device is located within a base station's cell, other terminal devices do not rewrite the current timeslot format and use it for communication. In other words, when other terminal devices can communicate with the base station, the terminal device should not rewrite the symbols used for sidelink communication in order to prioritize communication with the base station.

[0367] (Rewrite the conditions)

[0368] Next, specific examples of the above rewriting conditions will be described. For example, the following conditions can be considered as rewriting conditions. Note that rewriting conditions can be configured by the base station as described above, or they can be pre-specified in the standard.

[0369] •CBR (Channel Busy Ratio)

[0370] • Traffic model (e.g., packet size or period)

[0371] • QoS (Quality of Service) requirements

[0372] Priority information

[0373] [CBR]

[0374] For example, when the CBR reported by the terminal device meets preset rewriting conditions, the base station determines the symbol rewriting. For instance, when the base station determines that the communication channel for sidelink communication is congested based on the CBR, the base station rewrites the uplink symbol or flexible symbol in the current timeslot format to a sidelink symbol or an uplink / sidelink symbol. As a result, resources available for sidelink communication increase, and the congestion situation can be improved. Note that when the terminal device itself determines the symbol rewriting, the terminal device determines the symbol rewriting based on the CBR obtained by the terminal device and rewrites the symbol.

[0375] [Flow Model]

[0376] For example, when the traffic model reported by the terminal device meets preset rewriting conditions, the base station determines symbol rewriting. Specifically, the base station predicts the terminal device's transmission timing and the amount of resources required for transmission based on the traffic model, and rewrites the symbols so that the time slot format matches the prediction result. For example, when the packet size of the terminal device's sidelink communication is large, the base station (or the terminal device) rewrites the uplink symbols or flexible symbols into sidelink symbols or uplink / sidelink symbols. As a result, the amount of resources used for sidelink communication increases, so appropriate communication can be performed even when the packet size is large. In addition, when transmitting multiple times in a predetermined time slot format, for example when the terminal device's transmission cycle is long, the base station (or the terminal device) can reduce the total number of sidelink symbols. That is, when the terminal device's transmission cycle is long, the number of sidelink symbols in multiple time slot formats can be relatively reduced. Note that when the terminal device itself determines symbol rewriting, the terminal device determines and rewrites the symbols based on the traffic model obtained by the terminal device.

[0377] [QoS]

[0378] For example, the base station determines the symbol rewriting based on the QoS requirements of the terminal device. (See reference...) Figure 28To describe this. Figure 28 This is a diagram illustrating an example of symbol rewriting. To satisfy the requirement that when... Figure 28 The order shown (from left to right on the page) indicates the maximum delay requirement starting from the generation of the first symbol when using symbols. The base station rewrites the symbols using symbols capable of lateral link communication (lateral link communication only or a combination of lateral link and uplink communication). Figure 27 Any uplink symbol shown ( Figure 27 (The fourteenth symbol in the original text). As a result, in the rewritten time slot format, sidelink communication can be performed at the fourteenth symbol, thus satisfying the maximum latency request in sidelink communication. Note that when the terminal device itself determines the symbol rewriting, the terminal device determines and rewrites the symbol based on QoS requirements.

[0379] [Priority Information]

[0380] For example, the base station determines symbol rewriting based on priority information indicating communication priority. For instance, suppose the base station configures symbols for simultaneous communication on the sidelink and uplink in the terminal device using the current timeslot format. In this case, the base station rewrites the symbols for the communication type to be prioritized (the communication type with higher priority) in the sidelink or uplink symbols based on the terminal device's priority information. As a result, simultaneous communication on the sidelink and uplink can be avoided, and priority communication can be prioritized within the sidelink and uplink communications.

[0381] [Specific examples of symbol rewriting]

[0382] When rewriting the slot format symbols, the rewrite mode is as follows: Figure 29 As shown. Figure 29 This is a diagram illustrating the symbol rewriting patterns in the time slot format. Figure 29 In this code, the downlink symbol is represented by "S", the uplink symbol by "D", the uplink symbol by "U", and the flexible symbol by "F". According to... Figure 28 Combinations that can be rewritten by symbols (" Figure 29 The Y” shown in the figure is as follows.

[0383] • Rewrite the F notation as an S notation

[0384] • Rewrite from F notation to U / S notation

[0385] • Rewrite the U symbol as an S symbol

[0386] • Rewrite from U symbol to U / S symbol

[0387] • Rewrite the S symbol as a U symbol

[0388] • Rewrite the S symbol as an F symbol or a U / S symbol

[0389] • Rewrite the U / S notation as either U or S notation

[0390] The following will describe each of the above rewrites in detail.

[0391] [Rewrite from F notation to S notation]

[0392] This is the case when flexible symbols included in the existing timeslot format are rewritten as symbols for sidelink communication. This allows the terminal device to perform sidelink communication using flexible symbols in the timeslot format. In other words, sidelink communication can be performed without interfering with communication via uplink or downlink symbols configured in the existing timeslot format.

[0393] [Rewrite from F notation to U / S notation]

[0394] This involves rewriting the flexible symbols included in the existing time slot format into symbols capable of performing both uplink and lateral link communication. As a result, the terminal device can use the flexible symbols to perform either lateral link communication or uplink communication (lateral link or uplink), or to perform both lateral link communication and uplink communication simultaneously (lateral link and uplink).

[0395] For example, as a use case for configuring sidelink or uplink communication (sidelink or uplink) symbols, the terminal device essentially performs uplink communication using, for example, rewritten symbols with the same timeslot format, and performs sidelink communication using rewritten symbols when other sidelink symbols are not available. This makes it possible to support use cases such as URLLC communication and resource preemption.

[0396] Furthermore, as a use case of simultaneous communication (sidelink and uplink) configured with both sidelink and uplink communication, a terminal device sends information to a base station via, for example, uplink communication, while simultaneously sending information to other terminals via sidelink communication. This enables use cases where, for example, HARQ feedback is simultaneously sent to a base station and other terminals.

[0397] [Rewrite from U symbol to S symbol]

[0398] This occurs when symbols included in the existing time slot format for uplink communication are rewritten to represent symbols for lateral communication. For example, this rewriting is performed when there are no flexible symbols in the time slot format, or when rewriting is not possible even if flexible symbols are available. Alternatively, this rewriting is performed when the number of lateral symbols required in the current time slot format is insufficient. For instance, the terminal device rewrites existing symbols so that the lateral symbols are continuous when continuous lateral symbols are needed along the time axis.

[0399] Specifically, when a timeslot format called “DDDDDDDDDDSSUSS” exists, the thirteenth uplink symbol is rewritten as a sidelink symbol. As a result, the eleventh to fifteenth consecutive symbols can be used for sidelink communication. Alternatively, when flexible symbols are available for sidelink communication, the thirteenth uplink symbol of the timeslot format “DDDDDDDDDDFFUFF” can be rewritten as a sidelink symbol (or a flexible symbol), thus allowing the eleventh to fifteenth consecutive symbols to be used for sidelink communication.

[0400] [Rewrite from U symbol to U / S symbol]

[0401] This involves rewriting symbols included in the existing timeslot format for uplink communication to symbols capable of performing both uplink and lateral communication. Specifically, it rewrites either lateral or uplink communication (lateral or uplink), or simultaneous lateral and uplink communication (lateral and uplink). As a result, since the terminal device is in a state where uplink communication can still be performed even after rewriting, lateral communication can be performed while minimizing the impact of uplink symbol rewriting on uplink communication.

[0402] Furthermore, for example, the terminal device can determine whether to perform uplink communication or sidelink communication based on the aforementioned priority information. As a specific use case, suppose the terminal device receives a PDSCH from the base station and sends a HARQ feedback after 4ms. In this case, by rewriting the symbol to a U / S symbol after 4ms, uplink communication with the base station is performed when the HARQ feedback is prioritized based on the priority information, and sidelink communication with other terminal devices is performed when security messages are prioritized based on the priority information. Alternatively, when uplink communication and sidelink communication have the same priority, the terminal device performs both uplink and sidelink communication simultaneously. Thus, by rewriting the uplink symbol to a symbol capable of performing both uplink and sidelink communication, communication can be flexibly supported based on priority information.

[0403] [Rewrite the S symbol as U symbol]

[0404] This includes cases where sidelink symbols in the newly generated time slot format (1A) are rewritten as uplink symbols. As such a use case, it is assumed that the number of uplink symbols is insufficient for the existing time slot format because the amount of data transmitted for uplink communication is large. Specifically, when the number of uplink symbols in the existing time slot format is insufficient for uplink communication of large amounts of data from the terminal device, the base station rewrites the sidelink symbols with uplink symbols. As a result, for example, even if the number of flexible symbols is insufficient, a large amount of data can be transmitted to the base station via uplink communication.

[0405] [Rewrite from S symbol to F symbol or U / S symbol]

[0406] This refers to the case where the sidelink symbols included in the newly generated time slot format described above (1A) are rewritten as flexible symbols or symbols capable of performing both sidelink and uplink communication (sidelink or uplink symbols or both). As a use case, assume that the traffic model for sidelink communication is changed. For example, when switching from sending periodic traffic to sending non-periodic traffic, the terminal device wastes sidelink symbol resources when the sidelink symbols that were originally intended to be used are no longer used due to this change. Therefore, since the terminal device can respond to changes in traffic by rewriting existing sidelink symbols as flexible symbols or symbols capable of performing both sidelink and uplink communication to perform uplink or downlink communication, resource waste can be minimized even when the terminal device is not performing sidelink communication.

[0407] [Rewrite from U / S notation to U notation or S notation]

[0408] This includes cases where symbols (sidelink or uplink symbols or sidelink and uplink symbols) in the newly generated time slot format described above (1A) are rewritten as uplink symbols or sidelink symbols. As a use case, the receiving terminal may need to determine whether the transmitting terminal's transmission is uplink communication or sidelink communication.

[0409] Specifically, the receiving terminal needs to perform blind decoding to determine whether the transmission from the sending terminal is uplink communication or sidelink communication, and as a result, the decoding complexity may increase. For example, by rewriting the symbols that enable sidelink or uplink communication (sidelink or uplink) to uplink or sidelink symbols, the receiving terminal does not need to perform the decoding required for identification.

[0410] In addition, the receiving terminal rewrites the symbols (sidelink and uplink symbols) that enable sidelink and uplink communication to uplink symbols or sidelink symbols to perform sidelink measurements, thus avoiding situations where energy assessment results are inappropriate.

[0411] Furthermore, by allowing the transmitting terminal to perform uplink communication or sidelink communication (sidelink or uplink) on the transmitting terminal side, the problem that occurs in this situation can be solved by rewriting the uplink symbol or sidelink symbol when power sharing is not performed well or when performing uplink communication and sidelink communication (sidelink and uplink), even if inter-carrier interference occurs between them.

[0412] <<4. Revision>>

[0413] The above embodiments are examples, and further or alternatively, various modifications and applications are possible. At least some of the following modifications may be applied to some or all of the above embodiments.

[0414] For example, in TDD-UL-DL-ConfigurationCommon and TDD-UL-DL-ConfigDedicated above, the time slot configuration configured in the UE can be configured to include one or more downlink symbols, uplink symbols, flexible symbols, and sidelink symbols. Furthermore, the DCI format 2_0 above can directly or indirectly indicate via SFI that the time slot format configured in the UE includes one or more downlink symbols, uplink symbols, flexible symbols, and sidelink symbols. Note that the SFI can be associated one-to-one with a SlotFormat combination ID. The SlotFormat combination ID can correspond to one or more time slot formats.

[0415] Further or alternatively, the terminal device performs sidelink (SL) transmission or SL reception on the physical sidelink channel using flexible symbols (or a set thereof) when the following conditions (a) to (d) are met.

[0416] (a) The time slot configuration configured on the end device via 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 end device.

[0417] (b) The terminal equipment detects (receives) DCI format 2_0 including SFI to provide a time slot format, and DCI format 2_0 indicates multiple symbols (or a set thereof) as flexible symbols.

[0418] (c) The terminal device does not detect the DCI format (e.g., DCI format 1_0, DCI format 1_1, or DCI format 0_1) used for receiving PDSCH and CSI-RS, or the terminal device does not detect the DCI format (e.g., DCI format 0_0, DCI format 0_1, DCI format 1_0, DCI format 1_1, and DCI format 2_3) or RAR UL license used for transmitting PUSCH, PUCCH, PRACH, or SRS, and

[0419] (d) The terminal device receives a DCI format X_Y representing SL transmission or SL reception on the physical side link channel.

[0420] In this scenario, the terminal device can rewrite or reconfigure flexible symbols (or a set thereof) as symbols (or a set thereof) for SL transmission or SL reception on the physical side link channel, and can transmit or receive on the physical side link channel. In other words, in this scenario, the terminal device can identify (consider) flexible symbols (or a set thereof) as symbols (or a set thereof) for SL transmission or SL reception on the physical side link channel, or can assume that flexible symbols (or a set thereof) are symbols for SL transmission or SL reception on the physical side link channel, and then perform SL transmission or SL reception on the physical side link channel. Note that conditions (a) to (d) in this scenario can also be used as conditions (rewrite conditions) for determining whether symbol rewriting is performed (or indicated) by the methods shown in (3A-1) to (3A-4) above.

[0421] Further or alternatively, the terminal device performs SL transmission or SL reception on the physical side link channel using flexible symbols (or a set thereof) when the following conditions (a) to (d) are met.

[0422] (a) The time slot configuration configured on the end device via 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 end device.

[0423] (b) The terminal equipment does not receive DCI format 2_0, which includes SFI to provide the time slot format, and

[0424] (c) The terminal device receives a DCI format X_Y representing SL transmission or SL reception on the physical side link channel.

[0425] In this scenario, the terminal device can rewrite or reconfigure flexible symbols (or a set thereof) as symbols (or a set thereof) for SL transmission or SL reception on the physical side link channel, and can transmit or receive SL on the physical side link channel. In other words, in this scenario, the terminal device can identify (consider) flexible symbols (or a set thereof) as symbols (or a set thereof) for SL transmission or SL reception on the physical side link channel, or can assume that flexible symbols (or a set thereof) are symbols (or a set thereof) for SL transmission or SL reception on the physical side link channel, and then perform SL transmission or SL reception on the physical side link channel. Note that conditions (a) to (c) in this scenario can also be used as conditions (rewrite conditions) for determining whether symbol rewriting is performed (or indicated) by the methods shown in (3A-1) to (3A-4) above.

[0426] Note that the physical side crosslink channel mentioned above can be any one of (a) to (d) below, and can include any one of (a) to (d).

[0427] (a) PSBCH (Physical Side Link Broadcast Channel)

[0428] (b) PSCCH (Physical Side Link Control Channel)

[0429] (c) PSDCH (Physical Side Link Discovery Channel)

[0430] (d) PSSCH (Physical Side Link Shared Channel)

[0431] Furthermore, the DCI format X_Y used by the aforementioned terminal equipment to transmit or receive the physical side link channel in SL can be defined as a new DCI format. For example, DCI format X_Y can be DCI format 3_0 or DCI format 5_0.

[0432] In addition, the aforementioned DCI format X_Y may include the following information (a) to (c).

[0433] (a) PSCCH-6 bit resources

[0434] (b) TPC commands of PSCCH and PSSCH-1 bits

[0435] (c) SCI format field 0

[0436] In addition, the above (c) SCI format 0 field may include the following information (c1) to (c3).

[0437] (c1) Frequency hopping flag

[0438] (c2) Resource block allocation and jump resource allocation

[0439] (c3) Time Resource Mode

[0440] Furthermore, 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, MTC communication, etc. In addition, this embodiment can also be applied to mobile cells, relay communication, etc. That is to say, in this embodiment, V2X communication is not necessarily an essential component.

[0441] Furthermore, although this embodiment is described as a method for allocating resources in Mode 3, it can also be applied to Mode 4.

[0442] Furthermore, although this embodiment is described as a method for FDM type resource pools, it can also be applied to TDM type resource pools.

[0443] Furthermore, this embodiment is also applicable to multi-carrier communication that uses multiple carriers to perform side-link communication.

[0444] Furthermore, the control device used to control the management device 10, base station device 20, base station device 30, terminal device 40, or mobile device 50 in this embodiment can be implemented by a dedicated computer system or a general-purpose computer system.

[0445] For example, the program used to perform the above operations is stored on a computer-readable recording medium such as an optical disc, semiconductor memory, magnetic tape, or floppy disk, and is distributed. Then, for example, the control device is configured by installing the program on a computer and performing the above processes. In this case, the control device may be an external device (e.g., a personal computer) of the management device 10, base station device 20, base station device 30, terminal device 40, or mobile device 50. Furthermore, the control device may be a device within the management device 10, base station device 20, base station device 30, terminal device 40, or mobile device 50 (e.g., control unit 13, control unit 24, control unit 34, control unit 45, or control unit 55).

[0446] Furthermore, the communication program can be stored on a disk drive located on a server device on a network such as the Internet, and can also be downloaded to a computer. Additionally, the above functions can be achieved through cooperation between the operating system (OS) and application software. In this case, parts other than the OS can be stored on a medium and distributed, or parts other than the OS can be stored on a server device and thus downloaded to a computer.

[0447] Furthermore, in the processes described in the above embodiments, all or part of the processes described as being executed automatically can also be executed manually, or all or part of the processes described as being executed manually can be executed automatically by known methods. Moreover, unless otherwise specified, the processing procedures, specific names, and information including various data and parameters shown in the above documents and figures can be arbitrarily changed. For example, the various information shown in the figures is not limited to the illustrated information.

[0448] Furthermore, each component of each device shown in the accompanying drawings is a functional concept and does not necessarily require physical configuration as illustrated. That is, the specific form of distribution / integration of each device is not limited to that shown in the drawings, and all or part of it can be functionally or physically distributed / integrated in any unit according to various loads and usage conditions.

[0449] Furthermore, the above embodiments can be appropriately combined in areas where the processing content does not conflict with each other.

[0450] <<5. Conclusion>>

[0451] As described above, according to one embodiment of this disclosure, base station equipment (e.g., base station equipment 20 and base station equipment 30) includes communication units (radio communication units 21 and 31) and control units 24 and 34. The communication units (radio communication units 21 and 31) communicate with terminal equipment (terminal equipment 40 and mobile equipment 50). When at least one symbol included in the time slot format configured in the terminal equipment is a symbol for communication other than sidelink communication, control units 24 and 34 send information to the terminal equipment for use by the terminal equipment as a symbol for sidelink communication using at least one symbol. As a result, since the terminal equipment can perform sidelink communication using the NR time slot format, the requirements of various services in NR V2X communication can be met, thus achieving high communication performance.

[0452] Although each embodiment of this disclosure has been described above, the technical scope of this disclosure is not limited to each of the above embodiments, and various modifications can be made without departing from the spirit of this disclosure. Furthermore, components in different embodiments and modifications can be appropriately combined.

[0453] Furthermore, the effects of each embodiment described in this specification are merely examples and are not limiting; other effects may be obtained.

[0454] Note that this technology can also be configured as follows.

[0455] (1) A base station device, comprising:

[0456] A communication unit that communicates with terminal devices; and

[0457] The control unit sends information to the terminal device, when at least one symbol included in the time slot format configured in the terminal device is a symbol for performing communication other than side link communication, that the control unit uses the at least one symbol as a symbol for performing side link communication.

[0458] (2) The base station equipment according to (1), wherein

[0459] The control unit generates a timeslot format that includes symbols for performing side link communication and sends the generated timeslot format to the terminal device.

[0460] (3) The base station equipment according to any one of (1) to (2), wherein

[0461] The control unit sends information to the terminal device to change the symbols included in the time slot format configured in the terminal device for performing communications other than side link communications to symbols for performing side link communications.

[0462] (4) The base station equipment according to (3), wherein

[0463] When the information reported from the terminal device meets the predetermined rewrite conditions, the control unit determines the symbol to be changed and sends the information for changing to the symbol used to perform side link communication to the terminal device.

[0464] (5) The base station equipment according to (4), wherein

[0465] The information reported from the terminal device is about the congestion status of the channel.

[0466] (6) The base station equipment according to (4), wherein

[0467] The information reported from the terminal device is about the terminal device's traffic model.

[0468] (7) The base station equipment according to (4), wherein

[0469] The information reported from the terminal device is about the terminal device's QoS requirements.

[0470] (8) The base station equipment according to (4), wherein

[0471] The information reported from the terminal device is about the communication priority of the terminal device.

[0472] (9) The base station equipment according to any one of (1) to (8), wherein

[0473] The control unit sends 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 the cell managed by the base station.

[0474] (10) The base station equipment according to any one of (1) to (9), wherein

[0475] The control unit individually sends information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to each terminal device belonging to the cell managed by the base station.

[0476] (11) The base station equipment according to any one of (1) to (10), wherein

[0477] The information used by the terminal device to use the at least one symbol as a symbol for sidelink communication is bitmap information.

[0478] (12) The base station equipment according to any one of (1) to (11), wherein

[0479] The symbol used to perform side link communication is the symbol used to perform only side link communication.

[0480] (13) The base station equipment according to any one of (1) to (12), wherein

[0481] The symbols used to perform side link communication are symbols used to perform side link communication or uplink communication.

[0482] (14) The base station equipment according to any one of (1) to (13), wherein

[0483] The symbol used to perform side link communication is the symbol used to perform simultaneous side link communication and uplink communication.

[0484] (15) A method for controlling base station equipment, comprising:

[0485] Communicating with terminal devices; and

[0486] When at least one symbol included in the time slot format configured in the terminal device is a symbol for performing communication other than side link communication, information is sent to the terminal device for the terminal device to use the at least one symbol as a symbol for performing side link communication.

[0487] (16) A terminal device, comprising:

[0488] A communication unit that communicates with base station equipment; and

[0489] The control unit receives information from the base station device regarding the terminal device's use of the at least one symbol as a symbol for performing communication other than sidelink communication when at least one symbol included in the time slot format configured in the terminal device is a symbol for performing sidelink communication.

[0490] (17) A method for controlling a terminal device, comprising:

[0491] Communicating with base station equipment; and

[0492] When at least one symbol included in the time slot format configured in the terminal device is a symbol for performing communication other than side link communication, the terminal device receives information from the base station device for the terminal device to use the at least one symbol as a symbol for performing side link communication.

[0493] Identifier list

[0494] 1. Information Processing System

[0495] 10. Management Equipment

[0496] 20 and 30 base station equipment

[0497] 40 terminal devices

[0498] 50 mobile devices

[0499] Network communication units 11, 23, 33, 43, 53

[0500] 12, 22, 32, 42, 52 storage units

[0501] Control units 13, 24, 34, 45, and 55

[0502] Radio communication units 21, 31, 41, and 51

[0503] 44 and 54 Input / Output Units

[0504] 211, 311, 411, 511 Receiving and Processing Units

[0505] 212, 312, 412, 512 Transmission Processing Units

[0506] 213, 313, 413, 513 antennas

Claims

1. A base station device comprising: a communication unit that communicates with a terminal device; and a control unit that, when at least one symbol included in a slot format configured 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, wherein the control unit transmits, to the terminal device, information for changing a symbol for performing communication other than sidelink communication included in a slot format configured in the terminal device to a symbol for performing sidelink communication, the control unit is capable of determining to change the symbol and transmit the information for changing to the symbol for performing sidelink communication to the terminal device based on at least one of a channel busy ratio reported by the terminal device, a traffic model reported by the terminal device, a quality of service requirement of the terminal device, and priority information indicating a communication priority.

2. The base station device according to claim 1, wherein the control unit generates a slot format including a symbol for performing sidelink communication, and transmits the generated slot format to the terminal device.

3. The base station device according to claim 1, wherein the control unit determines to change the symbol and transmit the information for changing to the symbol for performing sidelink communication to the terminal device when a predetermined override condition is satisfied from information reported by the terminal device.

4. The base station device according to claim 3, wherein the information reported by the terminal device is information on a congestion state of a channel.

5. The base station device according to claim 3, wherein the information reported by the terminal device is information on a traffic model of the terminal device.

6. The base station device according to claim 3, wherein the information reported by the terminal device is information on a QoS requirement of the terminal device.

7. The base station device according to claim 3, wherein the information reported by the terminal device is information on a communication priority of the terminal device.

8. The base station device according to claim 1, wherein the control unit transmits the 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.

9. The base station device according to claim 1, wherein the control unit individually transmits the information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication to each terminal device belonging to a cell managed by the base station.

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

11. The base station device according to claim 1, wherein the symbol for performing sidelink communication is a symbol for performing only sidelink communication.

12. The base station device according to claim 1, wherein the symbol for performing sidelink communication is a symbol for performing sidelink communication or uplink communication.

13. The base station device according to claim 1, wherein The symbol for performing sidelink communication is a symbol for simultaneous communication of sidelink communication and uplink communication.

14. A method of controlling a base station device, comprising: communicating with a terminal device; when at least one symbol included in a slot format configured in the terminal device is a symbol for performing communication other than sidelink communication, transmitting, to the terminal device, information for the terminal device to use the at least one symbol as a symbol for performing sidelink communication; and and transmitting, to the terminal device, information for changing a symbol for performing communication other than sidelink communication included in a slot format configured in the terminal device to a symbol for performing sidelink communication, wherein the symbol is changed and the information for changing to a symbol for performing sidelink communication is transmitted to the terminal device based on at least one of a channel busy ratio reported by the terminal device, a traffic model reported by the terminal device, a quality of service requirement of the terminal device, and priority information indicating a priority of communication.

15. A terminal device, comprising: a communication unit that communicates with a base station device; and a control unit that, when at least one symbol included in a slot format configured 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, wherein the control unit receives, from the base station device, information for changing a symbol for performing communication other than sidelink communication included in a slot format configured in the terminal device to a symbol for performing sidelink communication, wherein the base station device determines to perform the change based on at least one of a channel busy ratio reported by the terminal device, a traffic model reported by the terminal device, a quality of service requirement of the terminal device, and priority information indicating a priority of communication, the control unit is able to determine to change the symbol and receive, from the base station device, the information for changing to a symbol for performing sidelink communication in accordance with the information.

16. A method of controlling a terminal device, comprising: communicating with a base station device; when at least one symbol included in a slot format configured in the terminal device is a symbol for performing communication other than sidelink communication, receiving, 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 receiving, from the base station device, information for changing a symbol for performing communication other than sidelink communication included in a slot format configured in the terminal device to a symbol for performing sidelink communication, wherein the base station device determines to perform the change based on at least one of a channel busy ratio reported by the terminal device, a traffic model reported by the terminal device, a quality of service requirement of the terminal device, and priority information indicating a priority of communication, wherein the symbol is changed and the information for changing to a symbol for performing sidelink communication is received from the base station device in accordance with the information.

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