Terminal device, program, and communication control method

Abstract

This terminal device comprises: a communication unit which has a function for wirelessly communicating in a first capability state in which the capability is reduced, and a function for wirelessly communicating in a second capability state in which the capability is higher than that in the first capability state; and a communication control unit which causes the communication unit to perform the wireless communication in the first capability state when notification information received by the communication unit from an access network device includes information indicating a specific area, and causes the communication unit to perform the wireless communication in the second capability state when the notification information does not include the information indicating the specific area.

Description

Terminal device, program, and communication control method

[0001] The present invention relates to a terminal device, a program, and a communication control method.

[0002] Patent Documents 1 to 4 describe technologies related to capability-limited UEs in wireless communication. [Prior art documents] [Patent documents] Patent Document 1: JP 2014-150501 A Patent Document 2: JP 2024-58635 A Patent Document 3: JP 2023-550243 A Patent Document 4: JP 2022-170559 A Problem to be solved

[0003] However, when a terminal device performs wireless communication to improve traffic safety, etc., there is a problem that the period during which the terminal device performs wireless communication becomes longer, and the amount of power consumed by the terminal device for wireless communication increases. In order to solve the above problem, the present application aims to improve safety, etc. while suppressing the amount of power consumed by the terminal device for wireless communication. This can ultimately further improve traffic safety and contribute to the development of sustainable transportation systems. General disclosure

[0004] In a first aspect of the present invention, there is provided a terminal device, the terminal device including a communication unit having a function of performing wireless communication in a first capability state and a function of performing wireless communication in a second capability state higher than the first capability state, and a communication control unit that causes the communication unit to perform wireless communication in the first capability state when broadcast information received by the communication unit from an access network device includes information indicating a specific area, and causes the communication unit to perform wireless communication in the second capability state when the broadcast information does not include information indicating the specific area.

[0005] In the above terminal device, the communication control unit may, when the broadcast information includes information indicating the specific area, cause the communication unit to transmit, to the access network device, first capability information indicating the capability of the communication unit in the first capability state. When the broadcast information does not include information indicating the specific area, the communication control unit may cause the communication unit to transmit, to the access network device, second capability information indicating the capability of the communication unit in the second capability state.

[0006] In any of the above terminal devices, the communication control unit may, when the broadcast information includes information indicating the specific area, transmit the first capability information to the access network device, and cause the communication unit to perform wireless communication in the first capability state on condition that instruction information to perform wireless communication in the first capability state is received from the access network device. When the broadcast information does not include the information indicating the specific area, the communication control unit may transmit the second capability information to the access network device, and cause the communication unit to perform wireless communication in the second capability state on condition that instruction information to perform wireless communication in the second capability state is received from the access network device.

[0007] In any of the above terminal devices, the specific area may be an area to which information regarding the location of the terminal device is provided, and the communication control unit may cause the communication unit to transmit the location information of the terminal device in the first capability state when the notification information includes information indicating the specific area.

[0008] In any of the above terminal devices, the specific area may be an area in which information regarding risks in the vicinity of the terminal device is provided.

[0009] In any of the above terminal devices, the terminal device may be movable together with traffic participants, and the specific area may be an area for which information on traffic risks around the terminal device is provided.

[0010] In any of the above terminal devices, the terminal device may be equipped with a warning control unit that performs control to output warning information to the traffic participants when the communication unit receives information indicating that a traffic risk exists around the terminal device.

[0011] In any of the above terminal devices, the communication control unit may cause the communication unit to start wireless communication in the second capability state when the risk around the terminal device exceeds a predetermined height while the communication unit is performing wireless communication in the first capability state.

[0012] In any of the above terminal devices, when wireless communication is being performed by the communication unit in the first capability state and information with a larger data volume than the location information of the terminal device is to be transmitted, the communication control unit may cause the communication unit to transmit information with a larger data volume than the location information in the second capability state.

[0013] In any of the above terminal devices, the communication control unit may cause the communication unit to perform intermittent communication in the first capability state when the notification information includes information indicating the specific area.

[0014] In any of the terminal devices described above, the specific area may be an area for which information regarding a risk in the vicinity of the terminal device is provided. When the communication unit is performing intermittent communication in the first capability state, the communication control unit may change the communication interval of the intermittent communication to a shorter interval as the risk in the vicinity of the terminal device increases.

[0015] In any of the above terminal devices, the communication control unit may cause the communication unit to start non-intermittent communication in the second capacity state when the risk around the terminal device exceeds a predetermined level while the communication unit is performing intermittent communication in the first capacity state.

[0016] In any of the above terminal devices, the first capability state may be a state having reduced capability (RedCap: Reduced Capability) compared to the second capability state.

[0017] In a second aspect of the present invention, there is provided a program that causes a computer to function as any one of the terminal devices described above.

[0018] In a third aspect of the present invention, there is provided a communication control method. The communication control method is executed in a terminal device having a communication unit with a function of performing wireless communication in a first capability state and a function of performing wireless communication in a second capability state higher than the first capability state. The communication control method includes a step of performing control to receive broadcast information from an access network device. The communication control method includes a step of causing the communication unit to perform wireless communication in the first capability state when the broadcast information includes information indicating a specific area. The communication control method includes a step of causing the communication unit to perform wireless communication in the second capability state when the broadcast information does not include information indicating the specific area.

[0019] The above summary of the invention does not list all of the features of the present invention, and subcombinations of these features may also be inventions.

[0020] 1 shows an outline of the configuration of a communication system 10 according to an embodiment. 1 shows an example of the system configuration of a terminal device 82. 1 shows an example of the system configuration of a network device 130. 1 shows an example of the system configuration of a server 140. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an execution sequence of processes executed in the communication system 10. 1 shows an example of a computer 2000.

[0021] The present invention will be described below through embodiments of the invention, but the following embodiments do not limit the scope of the invention as claimed. Furthermore, not all of the combinations of features described in the embodiments are necessarily essential to the solution of the invention.

[0022] 1 is a schematic diagram illustrating a configuration of a communication system 10 according to an embodiment. The communication system 10 includes an access network device 120, a core network 132, a terminal device 82, a mobile unit 20a, a mobile unit 20b, and a mobile unit 20c, a server 140, and an imaging device 70.

[0023] In this embodiment, the mobile units 20a and 20b may be collectively referred to as "mobile units 20" with the suffixes of their reference numerals omitted. The mobile unit 20a includes an information processing device 40a, the mobile unit 20b includes an information processing device 40b, and the mobile unit 20c includes an information processing device 40c. In this embodiment, the information processing devices 40a, 40b, and 40c may be collectively referred to as "information processing devices 40."

[0024] The access network device 120 is, for example, a radio base station. For example, the access network device 120 is a mobile communication base station that supports one or more mobile communication methods. The terminal device 82 is a mobile station that supports one or more mobile communication methods. The terminal device 82 may be called a user equipment (UE). In this embodiment, the mobile communication methods supported by the access network device 120 and the terminal device 82 may be, for example, mobile communication methods used in mobile communication systems such as a fourth-generation mobile communication system (4G) or a fifth-generation mobile communication system (5G).

[0025] The access network device 120 is a base station fixed at a specific location. The access network device 120 forms a cell and performs wireless communication with the terminal device 82 by forming the cell. The terminal device 82 can access the core network 132 via the access network device 120 and communicate with the server 140.

[0026] The core network 132 includes a network device 130. The network device 130 is a core network device. The network device 130 may be, for example, an Access and Mobility Management Function (AMF). The server 140 is included in a data network 142. The data network 142 includes, for example, a communication network such as the Internet.

[0027] The mobile body 20 is a mobile device. The mobile body 20 is, for example, a vehicle such as an automobile or a train. A vehicle is an example of a transportation device. In this embodiment, the mobile body 20 is an automobile. Specifically, the mobile body 20 is an automobile that travels on a road 90. However, the mobile body 20 may include not only a vehicle but also various aircraft including unmanned aerial vehicles. In other embodiments, the mobile body 20 may include an artificial satellite, a ship, etc. The mobile body 20 is an example of a traffic participant.

[0028] The mobile object 20 is configured to include various sensors such as a position sensor including a Global Navigation Satellite System (GNSS) receiver, a vehicle speed sensor, an imaging device, and a radar. The information processing device 40 has a function of processing information acquired by the various sensors included in the mobile object 20. The information processing device 40 has a function of communicating with the server 140 through the access network device 120. When the information processing device 40 is located within the cell of the access network device 120, it can periodically transmit current position information of the mobile object 20 detected by the position sensor including the GNSS receiver to the server 140 through the access network device 120.

[0029] The terminal device 82 is a terminal carried by the person 80. In this embodiment, the person 80 is a pedestrian. The person 80 is an example of a traffic participant. The terminal device 82 is, for example, a mobile terminal such as a smartphone. When the terminal device 82 is within the range of the cell of the access network device 120, the terminal device 82 may periodically transmit current location information of the terminal device 82 detected by a location sensor including a GNSS receiver to the server 140 via the access network device 120.

[0030] The imaging device 70 is an imaging device installed on a transportation infrastructure. The imaging device 70 acquires the positions of the moving objects 20 and the people 80 present within the imaging range of the imaging device 70 by analyzing the captured images, and transmits the acquired position information indicating the current positions of the moving objects 20 and the people 80 to the server 140. The imaging device 70 may transmit the position information of the moving objects 20 and the people 80 to the server 140 via the access network device 120. The imaging device 70 may transmit the position information of the moving objects 20 and the people 80 to the server 140 via a communication path other than the communication path via the access network device 120.

[0031] The server 140 identifies the current and / or future positions of the person 80 and the mobile object 20 based on the position information transmitted from the information processing device 40, the terminal device 82, and the imaging device 70. However, the server 140 considers the position of the terminal device 82 to be the position of the person 80. Based on the identified positions of the person 80 and the mobile object 20, the server 140 determines the risk that the person 80 and the mobile object 20 will approach each other within a predetermined distance in the future. The server 140 causes the terminal device 82 and the mobile object 20 to output warning information based on the level of risk that the person 80 and the mobile object 20 will approach each other within the predetermined distance. The risk that the person 80 and the mobile object 20 will approach each other within the predetermined distance is an example of a traffic risk.

[0032] 1 , for example, if the risk that the person 80 and the moving body 20a will approach within a predetermined distance in the future exceeds a predetermined height, the server 140 transmits warning information to the terminal device 82 and the information processing device 40a via the access network device 120. When the terminal device 82 receives the warning information, it outputs a warning to the person 80. For example, the terminal device 82 outputs the warning to the person 80 by sound, vibration, and / or display. When the information processing device 40a receives the warning information, it outputs a warning to the passengers of the moving body 20a. For example, the information processing device 40a outputs the warning to the passengers of the moving body 20a by sound, vibration, and / or display.

[0033] In this way, the communication system 10 can provide information about traffic risks within the coverage area of ​​the cell of the access network device 120. The access network device 120 broadcasts notification information including information indicating the area where information about traffic risks is provided. The notification information is, for example, a system information block (SIB). By receiving the notification information from the access network device 120, the terminal device 82 and the information processing device 40 recognize that they have entered the area where information about traffic risks is provided, and start transmitting location information to the server 140.

[0034] Here, a process in which the terminal device 82 transmits location information to the server 140 via the access network device 120 will be described, taking the case where the terminal device 82 enters the cell of the access network device 120 from outside the cell of the access network device 120. In this embodiment, the terminal device 82 has the function of performing wireless communication in a first capability state with reduced capability, and the function of performing wireless communication in a second capability state higher than the first capability state. The first capability state and the second capability state may differ in at least one of, for example, bandwidth, number of antennas, duplexing method, and / or maximum modulation multi-level number.

[0035] When the terminal device 82 receives the notification information from the access network device 120, the notification information contains information indicating an area where information on traffic risks is provided. Therefore, the terminal device 82 recognizes that it has entered an area where information on traffic risks is provided, and voluntarily performs a call origination process with the access network device 120. When performing a procedure related to the call origination process, the terminal device 82 transitions to a state in which communication is performed in a first capability state. For example, the terminal device 82 transmits a message to the access network device 120 including first capability information associated with the first capability state, and upon receiving from the access network device 120 a response message instructing the first capability state based on the first capability information, the terminal device 82 starts communication in the first capability state. Here, when performing a procedure related to the call origination process in response to a request from the terminal device 82, the access network device 120 may transition the wireless communication state of the terminal device 82 to a state in which discontinuous reception (DRX) is performed with a relatively long cycle.

[0036] As described above, the server 140 determines the risk that the person 80 and the mobile object 20 will approach within a predetermined distance in the future based on the position information transmitted from the information processing device 40, the terminal device 82, and the imaging device 70. When the risk that the person 80 and the mobile object 20 will approach within the predetermined distance becomes higher than a predetermined value, the server 140 instructs the terminal device 82 to communicate in a higher capability state. In this case, the terminal device 82 transmits second capability information associated with the second capability state to the access network device 120, and upon receiving information instructing the second capability state based on the second capability information from the access network device 120, the terminal device 82 transitions to a state in which communication is performed in the second capability state. This allows the terminal device 82 to receive warning information from the server 140 in a short time.

[0037] In this way, according to the communication system 10, when the terminal device 82 enters the range of the cell of the access network device 120, the terminal device 82 enters a state in which it communicates in the first capability state, thereby reducing the amount of power consumed by the terminal device 82 to transmit location information to the server 140 via wireless communication. When the traffic risk around the terminal device 82 exceeds a predetermined height, the terminal device 82 enters a state in which it communicates in the second capability state, thereby enabling it to quickly receive warning information. This improves safety in the transportation system.

[0038] 2 shows an example of the system configuration of the terminal device 82. The terminal device 82 includes a control unit 200, a storage unit 210, a communication unit 280, and an output unit 290.

[0039] The control unit 200 performs overall control of the terminal device 82. The communication unit 280 is responsible for wireless communication. The control unit 200 is realized by an arithmetic processing unit including a processor. The memory unit 210 is realized by including a non-volatile memory medium. The control unit 200 performs processing using information stored in the memory unit 210. The control unit 200 may be realized by a microcomputer including a CPU, ROM, RAM, I / O, buses, etc. The terminal device 82 may be realized by one or more computers. At least some of the functions of the terminal device 82 may be realized by a virtual system realized using virtualization technology.

[0040] The control unit 200 includes a warning control unit 220 and a communication control unit 230. The communication control unit 230 controls wireless communication by the communication unit 280. The communication unit 280 has a function of performing wireless communication in a first capability state and a function of performing wireless communication in a second capability state higher than the first capability state. The first capability state is a state having reduced capability (RedCap: Reduced Capability) compared to the second capability state.

[0041] The communication control unit 230 causes the communication unit 280 to perform wireless communication in a first capability state when the notification information received by the communication unit 280 from the access network device 120 includes information indicating a specific area, and causes the communication unit 280 to perform wireless communication in a second capability state when the notification information does not include information indicating a specific area.

[0042] When the broadcast information includes information indicating a specific area, the communication control unit 230 causes the communication unit 280 to transmit first capability information indicating the capability of the communication unit 280 in the first capability state to the access network device 120. When the broadcast information does not include information indicating a specific area, the communication control unit 230 causes the communication unit 280 to transmit second capability information indicating the capability of the communication unit 280 in the second capability state to the access network device 120.

[0043] When the broadcast information includes information indicating a specific area, the communication control unit 230 transmits first capability information to the access network device 120, and causes the communication unit 280 to perform wireless communication in the first capability state, on condition that instruction information to perform wireless communication in the first capability state has been received from the access network device 120. When the broadcast information does not include information indicating a specific area, the communication control unit 230 transmits second capability information to the access network device 120, and causes the communication unit 280 to perform wireless communication in the second capability state, on condition that instruction information to perform wireless communication in the second capability state has been received from the access network device 120.

[0044] The specific area may be an area for which information regarding the location of the terminal device 82 is provided. When the notification information includes information indicating the specific area, the communication control unit 230 causes the communication unit 280 to transmit the location information of the terminal device 82 in the first capability state.

[0045] The specific area may be an area for which information about risks around the terminal device 82 is provided. The terminal device 82 may be movable together with traffic participants. The specific area may be an area for which information about traffic risks around the terminal device 82 is provided.

[0046] The warning control unit 220 performs control to output warning information to the person 80 as a traffic participant when the communication unit 280 receives information indicating that a traffic risk exists around the terminal device 82. The warning control unit 220 causes the output unit 290 to output the warning information. The output unit 290 may have an output device such as a display device, a speaker, a light-emitting device, and / or a vibration device.

[0047] When the risk around the terminal device 82 exceeds a predetermined height while the communication unit 280 is performing wireless communication in the first capability state, the communication control unit 230 causes the communication unit 280 to start wireless communication in the second capability state. For example, when the risk around the terminal device 82 exceeds a predetermined height, the communication control unit 230 may cause the communication unit 280 to start wireless communication in the second capability state based on an instruction from the network device 130 and / or the server 140.

[0048] When wireless communication is being performed by the communication unit 280 in the first capability state, if information with a larger data volume than the location information of the terminal device 82 is to be transmitted, the communication control unit 230 causes the communication unit 280 to transmit the information with a larger data volume than the location information in the second capability state. For example, when the communication control unit 230 receives an instruction from the person 80 to transmit information with a larger data volume than the location information from the communication unit 280, the communication control unit 230 causes the communication unit 280 to transmit the information with a larger data volume than the location information in the second capability state.

[0049] When the notification information includes information indicating a specific area, the communication control unit 230 may cause the communication unit 280 to perform intermittent communication in the first capability state. The specific area may be an area for which information regarding risks in the vicinity of the terminal device 82 is provided. In this case, when the communication unit 280 is performing intermittent communication in the first capability state, the communication control unit 230 may change the communication interval in the intermittent communication to a shorter interval as the risk in the vicinity of the terminal device 82 increases. Based on instructions from the network device 130 and / or the server 140, the communication control unit 230 may change the communication interval in the intermittent communication to a shorter interval as the risk in the vicinity of the terminal device 82 increases.

[0050] When the risk around the terminal device 82 exceeds a predetermined height while the communication unit 280 is performing intermittent communication in the first capability state, the communication control unit 230 may cause the communication unit 280 to start non-intermittent communication in the second capability state. When the risk around the terminal device 82 exceeds a predetermined height, the communication control unit 230 may cause the communication unit 280 to start non-intermittent communication in the second capability state based on an instruction from the network device 130 and / or the server 140.

[0051] 3 shows an example of the system configuration of the network device 130. The network device 130 includes a control unit 300, a storage unit 310, and a communication unit 380.

[0052] The control unit 200 performs overall control of the network device 130. The communication unit 380 is responsible for communication in the core network 132. The control unit 300 is realized by an arithmetic processing unit including a processor. The memory unit 310 is realized by including a non-volatile memory medium. The control unit 300 performs processing using information stored in the memory unit 310. The control unit 300 may be realized by a microcomputer including a CPU, ROM, RAM, I / O, buses, etc. The network device 130 may be realized by one or more computers. At least a portion of the functions of the network device 130 may be realized by a virtual system realized using virtualization technology.

[0053] The control unit 300 includes a determination unit 320, a reception control unit 332, and a transmission control unit 334. The reception control unit 332 performs control for receiving information indicating risks in the vicinity of the terminal device 82. The determination unit 320 determines the time interval at which the terminal device 82 should transmit location information of the terminal device 82, based on the risks in the vicinity of the terminal device 82. For example, the determination unit 320 determines the cycle of discontinuous reception performed in the terminal device 82. The transmission control unit 334 performs control for transmitting information indicating the time interval to the access network device 130.

[0054] 4 shows an example of the system configuration of the server 140. The server 140 includes a control unit 400, a storage unit 410, and a communication unit 480.

[0055] The control unit 400 performs overall control of the server 140. The communication unit 480 is responsible for communication with at least the core network 132. The communication unit 480 is responsible for communication with at least computer networks other than the core network. The control unit 400 is realized by an arithmetic processing unit including a processor. The memory unit 410 is realized by including a non-volatile memory medium. The control unit 400 performs processing using information stored in the memory unit 410. The control unit 400 may be realized by a microcomputer including a CPU, ROM, RAM, I / O, buses, etc. The server 140 may be realized by one or more computers. At least a portion of the functions of the server 140 may be realized by a virtual system realized using virtualization technology.

[0056] The control unit 400 includes a determination unit 420, a reception control unit 432, and a transmission control unit 434. The reception control unit 432 performs control for receiving location information transmitted from the terminal device 82. The determination unit 420 determines a risk in the vicinity of the terminal device 82 based on the location information received from the terminal device 82. The transmission control unit 434 performs control for transmitting, to the terminal device 82, information for transitioning the capability state of the communication unit 280 of the terminal device 82 from a first capability state to a second capability state, in accordance with the risk determined by the determination unit 420.

[0057] The transmission control unit 434 may perform control to transmit information for shortening the interval at which location information is transmitted from the terminal device 82 in accordance with the risk determined by the determination unit 420 to a network device that is responsible for wireless communication with the terminal device 82. The "information for shortening the interval at which location information is transmitted from the terminal device 82" is, for example, "period information" and "risk information" described below.

[0058] 5 shows an execution sequence of processing executed in the communication system 10. It is assumed that the terminal device 82 is in an idle state when this sequence starts. In this sequence, the network device 130 may be an AMF (Access and Mobility Management Function).

[0059] In S502, the communication unit 280 of the terminal device 82 receives the SIB transmitted from the access network device 120. The SIB includes information indicating an area for which information on traffic risks is provided.

[0060] When the communication unit 280 receives the SIB indicating the area where information on traffic risks is provided, the communication control unit 230 starts the registration process and causes the communication unit 280 to transmit an RRC setup request (RRC) message to the access network device 120 (S504). At S506, the communication unit 280 of the terminal device 82 receives the RRC setup (RRC) message from the access network device 120.

[0061] When the communication unit 280 receives the RRC setup message, the communication control unit 230 causes the communication unit 280 to transmit an RRC Setup Complete (RRC) message to the access network device 120 (S508). The RRC Setup Complete message includes a NAS Registration Request message, which is a NAS message.

[0062] The access network device 120 extracts the registration request message included in the RRC setup complete message and sends it together with an initial UE message to the network device 130 (S510). The initial UE message is, for example, an NGAP message, NGAP: Initial UE Message.

[0063] At S512, the communication control unit 230 causes the communication unit 280 to transmit an RRC Capability Information (RRC) message to the access network device 120 (S512). The RRC UE capability information includes "Capability Information 1" indicating first capability information corresponding to the first capability state of the terminal device 82.

[0064] At S514, the access network device 120 transmits an RRC Connection Reconfiguration (RRC) message to the terminal device 82.

[0065] In this way, when the terminal device 82 receives an SIB including information indicating an area where information on traffic risks is provided, the Idle To Active procedure is executed, and the terminal device 82 enters an active state. However, it should be noted that this sequence does not show all of the Idle To Active procedure.

[0066] The RRC connection reconfiguration message received in S514 includes "capability parameter 1," which is information indicating the first capability state instructed by the access network device 120. When the communication unit 280 receives the RRC connection reconfiguration message, the communication control unit 230 transitions the communication unit 280 to a state in which it communicates in the instructed first capability state. As a result, the communication unit 280 transmits location information of the terminal device 82 to the server 140 in the first capability state at a predetermined time interval for transmitting location information (S520). As a result, it is possible to reduce the amount of power consumed for transmitting location information while maintaining the terminal device 82 in an active state.

[0067] Fig. 6 shows an execution sequence of processing executed in the communication system 10. The sequence of Fig. 6 can be executed following the sequence shown in Fig. 5. The sequence of Fig. 6 is an example of a sequence executed when a large amount of data, the amount of data being larger than the amount of location information, is temporarily transmitted to the server 140. For example, the sequence of Fig. 6 is executed when data transmission and reception occurs between the data network 142 and the terminal device 82 at the instruction of the person 80.

[0068] At S612, the communication control unit 230 causes the communication unit 280 to transmit an RRC Capability Information (RRC) message to the access network device 120. The RRC UE capability information includes "Capability Information 2" indicating second capability information corresponding to the second capability state of the terminal device 82.

[0069] At S614, the access network device 120 transmits an RRC Connection Reconfiguration (RRC) message to the terminal device 82. The RRC connection reconfiguration message received at S614 includes a "capability parameter 2," which is information indicating the second capability state instructed by the access network device 120. When the communication unit 280 receives the RRC connection reconfiguration message, the communication control unit 230 transitions the communication unit 280 to a state in which communication is performed in the instructed second capability state, and causes the communication unit 280 to transmit large amounts of data to the server 140. This makes it possible to transmit large amounts of data in a relatively short time.

[0070] When the transmission of the large amount of data is completed, the terminal device 82 executes a procedure for switching to the first capability state (S630). The procedure for switching to the first capability state corresponds to the procedures of S512 and S514 in FIG. 5, and therefore description thereof will be omitted. When the execution of the procedure for switching to the first capability state is completed, the communication control unit 230 causes the communication unit 280 to transmit location information of the terminal device 82 to the server 140 at a predetermined time interval for transmitting location information in the first capability state (S632). This allows the amount of power consumed by the terminal device 82 for wireless communication to be reduced, even when the terminal device 82 needs to temporarily transmit a large amount of data.

[0071] Fig. 7 shows an execution sequence of processing executed in the communication system 10. The sequence of Fig. 7 may be executed following the sequence shown in Fig. 5 or the sequence shown in Fig. 6. The sequence of Fig. 7 may be executed when the server 140 transmits warning information to the terminal device 82.

[0072] In S700, the determination unit 420 of the server 140 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82. As described above, the determination unit 420 determines the risk of approaching the person 80 and the moving body 20 based on, for example, the location information transmitted from the terminal device 82, the location information of the moving body 20 transmitted from the information processing device 40, and the location information transmitted from the imaging device 70.

[0073] If the risk determined in S700 exceeds a predetermined second threshold, the determination unit 420 transmits a capability switching instruction to the terminal device 82 (S702). The capability switching instruction may be flag information indicating that communication should be performed in the second capability state. Upon receiving the capability switching instruction from the server 140, the terminal device 82 executes a procedure for switching to the second capability state (S704). The procedure for switching to the second capability state corresponds to the procedures of S612 and S614 in FIG. 6, and therefore description thereof will be omitted.

[0074] Next, in S710, the server 140 transmits warning information indicating traffic risks around the terminal device 82 to the terminal device 82. The warning information is an example of "information related to the location of the terminal device 82." The warning information is an example of "information related to risks around the terminal device 82." The warning information may include instruction information that instructs the terminal device 82 to output a warning to the person 80. In S712, the warning control unit 220 of the terminal device 82 causes the output unit 290 to output a warning to the person 80 based on the warning information received from the server 140.

[0075] The communication control unit 230 of the terminal device 82 may maintain the capability state of the communication unit 280 in the second capability state until a predetermined time has elapsed after receiving warning information. If a predetermined time has elapsed after receiving warning information without receiving new warning information, the communication control unit 230 may transition the capability state of the communication unit 280 to the first capability state by executing a procedure for switching to the first capability state.

[0076] In the example of Figure 7, the server 140 transitions the communication unit 280 of the terminal device 82 to the second capability state in order to send warning information to the terminal device 82, but if the data amount of the warning information to be sent to the terminal device 82 is smaller than a predetermined value, the warning information may be sent to the terminal device 82 without transitioning the communication unit 280 of the terminal device 82 to the second capability state.

[0077] 5 to 7, etc., according to the communication system 10, when the terminal device 82 enters an area where information on traffic risks is provided, the terminal device 82 voluntarily enters an active state and transmits location information to the server 140. At this time, the terminal device 82 transmits the location information in the first capability state, which reduces the amount of power consumed to transmit the location information.

[0078] Fig. 8 shows an execution sequence of processing executed in the communication system 10. The sequence of Fig. 8 is an example of a sequence executed to cause the communication unit 280 of the terminal device 82 to transmit the location information of the terminal device 82 in the first capability state and in a state where intermittent communication is being performed.

[0079] The processes from S502 to S510 in Fig. 8 are the same as those described in relation to Fig. 5 , and therefore description thereof will be omitted. In S814, the access network device 120 transmits an RRC Connection Reconfiguration (RRC) message to the terminal device 82. The RRC connection reconfiguration message received in S814 includes information indicating cycle 1 of discontinuous reception to be performed by the communication unit 280. Upon receiving the RRC connection reconfiguration message, the communication control unit 230 transitions the communication unit 280 to a state in which discontinuous reception is performed at cycle 1. As a result, the communication unit 280 becomes able to transmit location information of the terminal device 82 to the server 140 at cycle 1 (S820). It is assumed that cycle 1 is a relatively long cycle. Cycle 1 may be, for example, 5 seconds, but is not limited to this.

[0080] Next, in S816, a procedure for switching to the first capability state is executed. The procedure for switching to the first capability state is the same as that in S630, and therefore description thereof will be omitted. Upon completion of the execution of the procedure for switching to the first capability state, in S820, the communication control unit 230 causes the communication unit 280 to transmit location information of the terminal device 82 to the server 140. As a result, the communication unit 280 enters the first capability state during the DRX active period, thereby significantly reducing power consumption during the DRX inactive period as well as power consumption during the DRX active period. Therefore, the amount of power consumed for transmitting location information can be further reduced.

[0081] 9 shows an execution sequence of processing executed in the communication system 10. The sequence of FIG. 9 can be executed following the sequence shown in FIG.

[0082] In S930, the determination unit 420 of the server 140 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82. As described above, the determination unit 420 determines the risk of approaching the person 80 and the moving body 20 based on, for example, the location information transmitted from the terminal device 82, the location information of the moving body 20 transmitted from the information processing device 40, and the location information transmitted from the imaging device 70.

[0083] In S931, the determination unit 420 determines the intermittent reception cycle 2 based on the traffic risk around the terminal device 82. For example, the higher the traffic risk around the terminal device 82, the shorter the cycle the determination unit 420 determines as the intermittent reception cycle 2. The determination unit 420 may determine the intermittent reception cycle 2 further based on the moving speed of the terminal device 82. For example, the higher the moving speed of the terminal device 82, the shorter the cycle the determination unit 420 determines as the intermittent reception cycle 2. Here, it is assumed that the traffic risk determined in S931 exceeds the first threshold associated with cycle 2. In S932, the transmission control unit 434 causes the communication unit 480 to transmit cycle information indicating the determined cycle to the network device 130. The cycle 2 may be, for example, 100 milliseconds, but is not limited to this. The cycle information is an example of interval information.

[0084] At S934, the transmission control unit 334 of the network device 130 causes the communication unit 380 to transmit the periodicity information indicating Period 2 received at S932 to the access network device 120. At S934, the periodicity information may be transmitted to the access network device 120 by a Downlink NAS Transfer (NGAP) message or a UE Context Modification message, which are NGAP messages.

[0085] In S936, the access network device 120 transmits the periodicity information indicating period 2 received in S934 to the terminal device 82. The periodicity information may be transmitted to the terminal device 82 by an RRC Connection Reconfiguration (RRC) message, which is an RRC message.

[0086] As a result, the communication control unit 230 causes the communication unit 280 to transition to a state in which it performs intermittent reception at period 2. As a result, the communication unit 280 enters a state in which it is possible to transmit the location information of the terminal device 82 to the server 140 at period 2 (S940).

[0087] In S950, the determination unit 420 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82 in S940. The processing in S950 is similar to the processing in S930. Here, it is assumed that the determination unit 420 determines a traffic risk that exceeds a predetermined second threshold. However, the second threshold is higher than the first threshold. In this case, the transmission control unit 434 causes the communication unit 480 to transmit a state transition message to the network device 130 (S952). The state transition message is a message indicating that the communication state of the terminal device 82 is to be transitioned to a non-intermittent communication state (i.e., a state in which wireless communication is performed continuously).

[0088] At S954, upon receiving the state transition message from the server 140, the transmission control unit 334 of the network device 130 transmits a state transition message for transitioning the communication state of the terminal device 82 to a continuous communication state to the access network device 120. The state transition message may be transmitted to the access network device 120 by a Downlink NAS Transfer (NGAP: DL NAS Transfer) message or a UE Context Modification message, which are NGAP messages.

[0089] In S956, upon receiving the state transition message in S954, the access network device 120 transmits a state transition message for transitioning the communication state of the terminal device 82 to a continuous communication state to the terminal device 82. The state transition message may be transmitted to the terminal device 82 by an RRC Connection Reconfiguration (RRC) message, which is an RRC message.

[0090] At S958, a procedure for switching to the second ability state is executed. The procedure for switching to the second ability state is the same as S704 in Fig. 7 . At S960, the server 140 transmits warning information indicating traffic risks around the terminal device 82 to the terminal device 82. At S962, the warning control unit 220 of the terminal device 82 causes the output unit 290 to output a warning to the person 80 based on the warning information received from the server 140.

[0091] In this way, not only is the capability state of the communication unit 280 set to the first capability state when the terminal device 82 transmits location information, but by performing intermittent communication, the power consumed by the terminal device 82 to transmit the location information of the terminal device 82 can be reduced.

[0092] 9 , the server 140 transmits a state transition message to the network device 130 (S952). However, the server 140 may execute the procedure of S958 and transmit warning information to the terminal device 82 without executing S952. If a relatively large amount of warning information is transmitted to the terminal device 82 while the terminal device 82 is performing discontinuous reception, the amount of unsent data addressed to the terminal device 82 increases. In this case, the access network device 120 switches the communication state of the terminal device 82 to a continuous communication state in order to transmit the unsent data to the terminal device 82. Therefore, the server 140 may be able to switch the communication state of the terminal device 82 to a continuous communication state by transmitting warning information to the terminal device 82 without transmitting a state transition message to the network device 130.

[0093] 10 shows an execution sequence of processing executed in the communication system 10. The sequence of FIG. 10 can be executed following the sequence shown in FIG.

[0094] At S1030, the determination unit 420 of the server 140 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82. The processing at S1030 is similar to the processing at S930, etc. Here, it is assumed that the determination unit 420 determines a traffic risk around the terminal device 82 that is equal to or less than the second threshold and exceeds the first threshold. In this case, at S1031, the determination unit 420 determines a period 2 (e.g., 100 milliseconds) for intermittent reception based on the traffic risk around the terminal device 82. At S1032, the transmission control unit 434 causes the communication unit 480 to transmit period information indicating period 2 to the network device 130.

[0095] Subsequently, in S1034, the transmission control unit 334 of the network device 130 causes the communication unit 380 to transmit the periodicity information indicating Period 2 received in S1032 to the access network device 120. In S1034, the periodicity information may be transmitted by a Downlink NAS Transfer (NGAP) message or a UE Context Modification message, which are NGAP messages.

[0096] In S1036, the access network device 120 transmits the periodicity information indicating period 2 received in S1034 to the terminal device 82. The periodicity information may be transmitted to the terminal device 82 by an RRC Connection Reconfiguration (RRC) message, which is an RRC message.

[0097] As a result, the communication control unit 230 transitions the wireless communication state of the communication unit 280 to the first capability state and a state in which intermittent reception is performed at period 2. As a result, the communication unit 280 becomes able to transmit the location information of the terminal device 82 to the server 140 at period 2 in the first capability state (S1040).

[0098] At S1050, the determination unit 420 of the server 140 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82 at period 2. The processing at S1050 is similar to the processing at S930, etc. Here, it is assumed that the determination unit 420 determines that the traffic risk around the terminal device 82 is equal to or less than a first threshold. In this case, at S1051, the determination unit 420 determines period 1 (e.g., 5 seconds) for intermittent reception based on the traffic risk around the terminal device 82. At S1052, the transmission control unit 434 causes the communication unit 480 to transmit period information indicating period 1 to the network device 130.

[0099] Subsequently, in S1054, the transmission control unit 334 of the network device 130 causes the communication unit 380 to transmit the periodicity information indicating Period 1 received in S1052 to the access network device 120. In S1054, the periodicity information may be transmitted by a Downlink NAS Transfer (NGAP) message or a UE Context Modification message, which are NGAP messages.

[0100] In S1056, the access network device 120 transmits the periodicity information indicating period 1 received in S1054 to the terminal device 82. The periodicity information may be transmitted to the terminal device 82 by an RRC Connection Reconfiguration (RRC) message, which is an RRC message.

[0101] As a result, the communication control unit 230 transitions the wireless communication state of the communication unit 280 to a state in which discontinuous reception is performed in the first capability state and at cycle 1. As a result, the communication unit 280 enters a state in which it is possible to transmit the location information of the terminal device 82 to the server 140 in the first capability state and at cycle 1 (S1060). In this way, the amount of power consumed to transmit the location information can be reduced in consideration of the risk determined by the server 140.

[0102] 11 shows an execution sequence of processing executed in the communication system 10. The sequence in FIG. 11 is a modified example of the sequence from S930 to S940 in FIG.

[0103] The sequence of Figure 11 differs from the sequence from S930 to S940 of Figure 9 in that the terminal device 82 transmits information about traffic risks to the network device 130, and the network device 130 determines the period of intermittent reception for the terminal device 82.

[0104] In S1130, the determination unit 420 of the server 140 determines a traffic risk around the terminal device 82 based on the location information transmitted from the terminal device 82. As described above, the determination unit 420 determines the risk of approaching the person 80 and the moving body 20 based on, for example, the location information transmitted from the terminal device 82, the location information of the moving body 20 transmitted from the information processing device 40, and the location information transmitted from the imaging device 70.

[0105] In S1131, the transmission control unit 434 causes the communication unit 480 to transmit risk information indicating the level of traffic risk determined by the determination unit 420 in S1130 to the network device 130. In S1132, the determination unit 320 of the network device 130 determines the intermittent reception cycle 2 based on the risk information received from the server 140.

[0106] At S1134, the transmission control unit 334 of the network device 130 causes the communication unit 380 to transmit periodicity information indicating the period 2 determined at S1132 to the access network device 120. At S1134, the periodicity information may be transmitted by a Downlink NAS Transfer (NGAP) message or a UE Context Modification message, which are NGAP messages. The transmission control unit 334 of the network device 130 may cause the communication unit 380 to transmit information indicating the period 2 determined at S1132 to the terminal device 82, separately from the periodicity information transmitted to the access network device 120.

[0107] In S1136, the access network device 120 transmits the periodicity information indicating period 2 received in S1134 to the terminal device 82. The periodicity information may be transmitted to the terminal device 82 by an RRC Connection Reconfiguration (RRC) message, which is an RRC message.

[0108] As a result, the communication unit 280 becomes capable of transmitting the location information of the terminal device 82 to the server 140 in the first capability state and at the period 2 (S1140). In this way, the network device 130 can determine the time interval at which the terminal device 82 will intermittently transmit the location information, based on the risk determined by the server 140.

[0109] As described with reference to Figures 8 to 11, etc., according to the communication system 10, when the terminal device 82 enters an area where information on traffic risks is provided, it voluntarily enters an active state and transmits location information to the server 140. At this time, the terminal device 82 transmits the location information in the first capability state and in a communication state in which discontinuous reception is performed. This makes it possible to further reduce power consumption by the amount of the DRX inactive period that occurs, compared to the configuration described with reference to Figures 5 to 7, etc.

[0110] 8 to 11, the communication system 10 allows the terminal device 82 to change the time interval at which it transmits location information depending on the traffic risk around the terminal device 82. This makes it possible to transmit the location information of the terminal device 82 to the server 140 at an appropriate time granularity depending on the level of traffic risk. This makes it possible to appropriately determine the traffic risk.

[0111] In the above, it has been explained that the terminal device 82 transitions to at least the first capability state and starts transmitting location information when it receives notification information indicating a specific area. The information processing device 40 of the mobile body 20 may also transition to at least the first capability state and start transmitting location information when it receives notification information indicating a specific area by performing the same processing as the terminal device 82. In other words, the information processing device 40 may be the "terminal device" of the present invention.

[0112] 5 to 11 and the like, the embodiments of transmitting various notifications and / or various information using messages such as an SIB, an RRC Setup Request message, an RRC Setup message, an RRC Setup Complete message, an RRC Connection Reconfiguration message, and an RRC UE Capability Information message have been described, but these messages are examples of messages for transmitting various notifications and / or various information. Messages for transmitting various notifications and / or various information are not limited to the above-mentioned messages.

[0113] 12 shows an example of a computer 2000 in which multiple embodiments of the present invention may be embodied in whole or in part. Programs installed on the computer 2000 may cause the computer 2000 to function as various devices, such as the terminal device 82, the network device 130, and the server 140, according to embodiments, or as each part of the devices, to perform operations associated with the devices or each part of the devices, and / or to perform processes or steps of the processes according to embodiments. Such programs may be executed by the CPU 2012 to cause the computer 2000 to perform specific operations associated with some or all of the processing procedures and blocks of the block diagrams described herein.

[0114] The computer 2000 according to this embodiment includes a CPU 2012 and a RAM 2014, which are interconnected by a host controller 2010. The computer 2000 also includes a ROM 2026, a flash memory 2024, a communication interface 2022, and an input / output chip 2040. The ROM 2026, the flash memory 2024, the communication interface 2022, and the input / output chip 2040 are connected to the host controller 2010 via the input / output controller 2020.

[0115] The CPU 2012 operates according to programs stored in the ROM 2026 and RAM 2014, thereby controlling each unit.

[0116] The communication interface 2022 communicates with other electronic devices via a network. The flash memory 2024 stores programs and data used by the CPU 2012 in the computer 2000. The ROM 2026 stores a boot program or the like executed by the computer 2000 upon activation and / or programs dependent on the hardware of the computer 2000. The input / output chip 2040 may also connect various input / output units such as a keyboard, mouse, and monitor to the input / output controller 2020 via input / output ports such as a serial port, a parallel port, a keyboard port, a mouse port, a monitor port, a USB port, an HDMI port, etc.

[0117] The programs are provided via a computer-readable storage medium such as a CD-ROM, DVD-ROM, or memory card, or via a network. RAM 2014, ROM 2026, and flash memory 2024 are examples of computer-readable storage media. The programs are installed in flash memory 2024, RAM 2014, or ROM 2026 and executed by CPU 2012. Information processing described in these programs is read by computer 2000, and causes cooperation between the programs and the various types of hardware resources described above. An apparatus or method may be configured by implementing operations or processing of information in accordance with the use of computer 2000.

[0118] For example, when communication is performed between the computer 2000 and an external device, the CPU 2012 may execute a communication program loaded into the RAM 2014 and instruct the communication interface 2022 to perform communication processing based on the processing described in the communication program. Under the control of the CPU 2012, the communication interface 2022 reads transmission data stored in a transmission buffer processing area provided in a recording medium such as the RAM 2014 or flash memory 2024, transmits the read transmission data to a network, and writes received data received from the network to a reception buffer processing area or the like provided on the recording medium.

[0119] The CPU 2012 may also cause all or a necessary portion of a file or database stored on a recording medium such as the flash memory 2024 to be read into the RAM 2014, and may perform various types of processing on the data on the RAM 2014. The CPU 2012 then writes the processed data back to the recording medium.

[0120] Various types of information, such as various types of programs, data, tables, and databases, may be stored on the recording medium and subjected to information processing. The CPU 2012 may perform various types of processing on data read from the RAM 2014, including various types of operations, information processing, conditional judgment, conditional branching, unconditional branching, information search / replacement, etc., as described herein and specified by the instruction sequences of the programs, and write the results back to the RAM 2014. The CPU 2012 may also search for information in a file, database, etc. on the recording medium. For example, if multiple entries each having an attribute value of a first attribute associated with an attribute value of a second attribute are stored on the recording medium, the CPU 2012 may search for an entry that matches a condition and specifies an attribute value of the first attribute from among the multiple entries, read the attribute value of the second attribute stored in the entry, and thereby obtain the attribute value of the second attribute associated with the first attribute that satisfies a predetermined condition.

[0121] The above-described programs or software modules may be stored in a computer-readable storage medium on or near the computer 2000. A recording medium such as a hard disk or RAM provided in a server system connected to a dedicated communication network or the Internet can be used as the computer-readable storage medium. The programs stored in the computer-readable storage medium may be provided to the computer 2000 via a network.

[0122] A program installed in computer 2000 and causing computer 2000 to function as terminal device 82, when executed by the computer, may act on CPU 2012, etc., to cause computer 2000 to function as each unit of terminal device 82. When the information processing described in these programs is read into computer 2000, computer 2000 functions as each unit of terminal device 82, which is a specific means formed by the cooperation of software and the various hardware resources described above. These specific means then perform calculations or processing of information according to the intended use of computer 2000 in this embodiment, thereby constructing a specific terminal device 82 according to the intended use.

[0123] A program installed on computer 2000 that causes computer 2000 to function as network device 130 may, when executed by the computer, act on CPU 2012 and the like to cause computer 2000 to function as each part of network device 130. When the information processing described in these programs is read into computer 2000, computer 2000 functions as each part of network device 130, which is a specific means formed by the cooperation of software and the various hardware resources described above. These specific means then perform calculations or processing of information according to the intended use of computer 2000 in this embodiment, thereby constructing a specific network device 130 according to the intended use.

[0124] A program installed on computer 2000 that causes computer 2000 to function as server 140 may, when executed by the computer, act on CPU 2012 and the like to cause computer 2000 to function as each unit of server 140. When the information processing described in these programs is read into computer 2000, computer 2000 functions as each unit of server 140, which is a specific means formed by the cooperation of software and the various hardware resources described above. These specific means then perform calculations or processing of information according to the intended use of computer 2000 in this embodiment, thereby constructing a specific server 140 according to the intended use.

[0125] Various embodiments have been described with reference to block diagrams. In the block diagrams, each block may represent (1) a stage of a process in which an operation is performed or (2) a portion of an apparatus responsible for performing the operation. Particular stages and portions may be implemented by dedicated circuitry, programmable circuitry provided with computer-readable instructions stored on a computer-readable storage medium, and / or a processor provided with computer-readable instructions stored on a computer-readable storage medium. Dedicated circuitry may include digital and / or analog hardware circuitry, and may include integrated circuits (ICs) and / or discrete circuits. Programmable circuitry may include reconfigurable hardware circuitry, including logical AND, OR, XOR, NAND, NOR, and other logic operations, flip-flops, registers, memory elements such as field programmable gate arrays (FPGAs), programmable logic arrays (PLAs), and the like.

[0126] A computer-readable storage medium may include any tangible device capable of storing instructions that are executed by an appropriate device, such that the computer-readable storage medium having instructions stored thereon constitutes at least a portion of an article of manufacture containing instructions that can be executed to provide means for performing the operations specified in a process or block diagram. Examples of computer-readable storage media may include electronic storage media, magnetic storage media, optical storage media, electromagnetic storage media, semiconductor storage media, etc. More specific examples of computer-readable storage media may include floppy disks, diskettes, hard disks, random access memories (RAMs), read-only memories (ROMs), erasable programmable read-only memories (EPROMs or flash memories), electrically erasable programmable read-only memories (EEPROMs), static random access memories (SRAMs), compact disc read-only memories (CD-ROMs), digital versatile discs (DVDs), Blu-ray discs, memory sticks, integrated circuit cards, etc.

[0127] The computer readable instructions may include either assembler instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state-setting data, or source or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk®, JAVA®, C++, etc., and conventional procedural programming languages ​​such as the “C” programming language or similar programming languages.

[0128] The computer-readable instructions may be provided to a processor or programmable circuitry of a programmable data processing apparatus, such as a computer, locally or over a local area network (LAN), a wide area network (WAN) such as the Internet, etc., and the computer-readable instructions may be executed to provide means for performing the operations specified in the described procedures or block diagrams.

[0129] Here, the computer may be a computer such as a PC (personal computer), a tablet computer, a smartphone, a workstation, a server computer, or a general-purpose computer, or may be a computer system in which multiple computers are connected. Such a computer system in which multiple computers are connected is also called a distributed computing system, which is a computer in the broad sense. In a distributed computing system, the multiple computers collectively execute a program by each executing a part of the program and transferring data between the computers as needed during program execution.

[0130] Examples of processors include computer processors, central processing units (CPUs), processing units, microprocessors, digital signal processors, controllers, microcontrollers, etc. A computer may have one processor or multiple processors. In a multiprocessor system with multiple processors, each processor executes a portion of a program and passes data between processors as needed during program execution, allowing the multiple processors to collectively execute the program. For example, in multitasking, each of the multiple processors may execute a portion of each task in small chunks by switching tasks at each time slice. In this case, which portion of a program each processor executes changes dynamically. Alternatively, which portion of a program each of the multiple processors executes may be statically determined by multiprocessor-aware programming.

[0131] Although the present invention has been described above using embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0132] It should be noted that the order of execution of each process, such as operations, procedures, steps, and stages, in the devices, systems, programs, and methods shown in the claims, specifications, and drawings is not specifically stated as "before," "prior to," etc., and that the processes can be performed in any order unless the output of a previous process is used in a subsequent process. Even if the operational flow in the claims, specifications, and drawings is described using "first," "next," etc. for convenience, this does not mean that the processes must be performed in this order.

[0133] 10 Communication system 20 Mobile object 40 Information processing device 70 Imaging device 80 Person 90 Road 82 Terminal device 120 Access network device 130 Network device 132 Core network 140 Server 142 Data network 200 Control unit 210 Memory unit 220 Warning control unit 230 Communication control unit 280 Communication unit 290 Output unit 300 Control unit 310 Memory unit 320 Determination unit 332 Reception control unit 334 Transmission control unit 380 Communication unit 400 Control unit 410 Memory unit 420 Determination unit 432 Reception control unit 434 Transmission control unit 480 Communication unit 2000 Computer 2010 Host controller 2012 CPU 2014 RAM 2020 Input / output controller 2022 Communication interface 2024 Flash memory 2026 ROM 2040 Input / output chip

Claims

1. A terminal device comprising: a communication unit having the function of performing wireless communication in a first capability state and the function of performing wireless communication in a second capability state higher than the first capability state; and a communication control unit that causes the communication unit to perform wireless communication in the first capability state when notification information received by the communication unit from an access network device includes information indicating a specific area, and causes the communication unit to perform wireless communication in the second capability state when the notification information does not include information indicating the specific area.

2. The terminal device of claim 1, wherein the communication control unit causes the communication unit to transmit first capability information indicating the capability of the communication unit in the first capability state to the access network device when the notification information includes information indicating the specific area, and causes the communication unit to transmit second capability information indicating the capability of the communication unit in the second capability state to the access network device when the notification information does not include information indicating the specific area.

3. The terminal device of claim 2, wherein the communication control unit, when the notification information includes information indicating the specific area, transmits the first capability information to the access network device, and causes the communication unit to perform wireless communication in the first capability state, on condition that instruction information to perform wireless communication in the first capability state is received from the access network device; and, when the notification information does not include information indicating the specific area, transmits the second capability information to the access network device, and causes the communication unit to perform wireless communication in the second capability state, on condition that instruction information to perform wireless communication in the second capability state is received from the access network device.

4. A terminal device as described in any one of claims 1 to 3, wherein the specific area is an area where information regarding the location of the terminal device is provided, and the communication control unit causes the communication unit to transmit location information of the terminal device in the first capability state when the notification information includes information indicating the specific area.

5. The terminal device according to claim 4, wherein the specific area is an area in which information regarding risks in the vicinity of the terminal device is provided.

6. The terminal device according to claim 4 or 5, wherein the terminal device is movable together with traffic participants, and the specific area is an area in which information regarding traffic risks around the terminal device is provided.

7. The terminal device according to claim 6, further comprising a warning control unit that performs control to output warning information to the traffic participants when the communication unit receives information indicating that a traffic risk exists around the terminal device.

8. A terminal device as described in claim 6 or 7, wherein the communication control unit causes the communication unit to start wireless communication in the second capability state when the risk around the terminal device exceeds a predetermined height while the communication unit is performing wireless communication in the first capability state.

9. A terminal device described in any one of claims 4 to 8, wherein the communication control unit, when transmitting information with a larger data volume than the location information of the terminal device while the communication unit is performing wireless communication in the first capability state, causes the communication unit to transmit information with a larger data volume than the location information in the second capability state.

10. A terminal device described in any one of claims 1 to 7, wherein the communication control unit causes the communication unit to perform intermittent communication in the first capability state when the notification information includes information indicating the specific area.

11. The terminal device described in claim 10, wherein the specific area is an area where information regarding risks in the vicinity of the terminal device is provided, and the communication control unit, when intermittent communication is being performed by the communication unit in the first capability state, changes the communication interval in the intermittent communication to a shorter interval the higher the risk in the vicinity of the terminal device.

12. A terminal device as described in claim 11, wherein the communication control unit causes the communication unit to start non-intermittent communication in the second capability state when the risk around the terminal device exceeds a predetermined height while the communication unit is performing intermittent communication in the first capability state.

13. The terminal device according to any one of claims 1 to 12, wherein the first capability state is a state having reduced capability (RedCap: Reduced Capability) compared to the second capability state.

14. A program for causing a computer to function as a terminal device according to any one of claims 1 to 13.

15. A communication control method executed in a terminal device having a communication unit with the function of performing wireless communication in a first capability state and the function of performing wireless communication in a second capability state higher than the first capability state, the communication control method comprising: a step of performing control to receive notification information from an access network device; a step of causing the communication unit to perform wireless communication in the first capability state if the notification information includes information indicating a specific area; and a step of causing the communication unit to perform wireless communication in the second capability state if the notification information does not include information indicating the specific area.

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