Communication apparatus and communication method

Abstract

A communication device (100) used as a mobile integrated access and backhaul (IAB) node of a mobile communication system includes an acquisition unit (101) that acquires environmental information relating to a position of the communication device (100), a determination unit (101) that determines whether notification information of the communication device (100) needs to be transmitted on the basis of the environmental information acquired by the acquisition unit (101), and a transmission unit (103) that transmits the notification information on the basis of the determination result of the determination unit (101).

Description

Technical Field

[0001] The present disclosure relates to a communication device and a communication method. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP) (registered trademark), standardization of Integrated Access and Backhaul (IAB) has been progressing as a communication technology for backhaul. IAB technology is a technology that uses millimeter wave wireless communication such as the 28 GHz band for access communication between a base station and a user equipment (UE) as backhaul communication at the same time (PTL 1). In such backhaul communication, a repeater called an IAB node relays communication from an IAB donor, which is a base station, through millimeter wave communication. The use of IAB technology can expand regional coverage at a lower cost than conventional wired communications using optical fibers, etc.

[0003] Until now, 3GPP (registered trademark) has made specifications for fixed base stations (IAB nodes that do not move) up to Release 17 (Rel-17). Currently, 3GPP (registered trademark) plans to actively discuss vehicle-mounted relays, which will become a use case in the next Release 18 (Rel-18), and mobile IABs for making specifications to realize this use case.

[0004] Here, it is conceivable that various requirements will arise that cannot be met only by the specifications of the assumed fixed base station discussed so far. Among them, one of the items discussed is "Licensing and setting of mobile base station relay". Here, it is assumed that a mobile IAB node temporarily installed in a vehicle will be used as a repeater and provide services to UEs in order to achieve special coverage and connectivity during large-scale events in an urban environment or a designated area. As a use case, 3GPP (registered trademark) Technical Report (TR) 22.839 states that if the mobile IAB node exists within a specific area, it provides services to neighboring UEs, and if the mobile IAB node moves outside the specific area, it suspends the provision of services.

[0005] According to PTL 2, a technology for providing application functions and services using location information and movement information is discussed.

[0006] Citation List

[0007] Patent Literature

[0008] PTL 1: Japanese Unexamined Patent Application Publication (Translation of PCT Application) No. 2019-534625

[0009] PLT 2: Japanese Patent No.4791493 Summary of the invention

[0010] Technical issues

[0011] As described above, it has been proposed to switch the availability of services depending on whether a mobile IAB node exists in a specific area. However, no specific method is given for controlling the start and suspension of service provision accompanying the movement of the mobile IAB node.

[0012] Therefore, the present disclosure is directed to the provision of a communication device or the like that can appropriately control execution and suspension of service provision of a mobile communication system.

[0013] Solution to the problem

[0014] According to one aspect of the present disclosure, a communication device used as a mobile integrated access and backhaul (IAB) node in a mobile communication system includes: an acquisition component, which is used to acquire information related to the location of the communication device; and a control component, which is used to distinguish whether to send notification information of the communication device based on the information acquired by the acquisition component.

[0015] Advantageous Effects of the Invention

[0016] According to an aspect of the present disclosure, execution and suspension of provision of services of a mobile communication system can be appropriately controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A configuration example of a communication system according to the first exemplary embodiment is illustrated.

[0018] Figure 2 is a block diagram illustrating a configuration example of a communication device configuring an Integrated Access and Backhaul (IAB) donor and an IAB node according to the first exemplary embodiment.

[0019] Figure 3 is a flow chart illustrating processing in a mobile IAB node.

[0020] Figure 4A The diagram illustrates changes in operating conditions accompanying movement of the mobile IAB node.

[0021] Figure 4B The diagram illustrates changes in operating conditions accompanying movement of the mobile IAB node.

[0022] Figure 4C The diagram illustrates changes in operating conditions accompanying movement of the mobile IAB node.

[0023] Figure 5 An example of a sequence is illustrated such as a case where a mobile IAB node participates in a fifth generation wireless (5G) network when provision of a service is started.

[0024] Figure 6An example of a sequence is illustrated such as a case where the mobile IAB node leaves the 5G network when provision of a service is suspended. DETAILED DESCRIPTION

[0025] A communication device according to an exemplary embodiment will be described in detail below with reference to the accompanying drawings. The technical scope of the present disclosure is defined by the claims and is not limited by the following respective exemplary embodiments.

[0026] Figure 1 A configuration example of a mobile communication system according to the first exemplary embodiment is illustrated.

[0027] like Figure 1 As shown in FIG. 1 , the mobile communication system is configured by including an integrated access and backhaul (IAB) donor 10, an IAB node 10A which is a fixed base station capable of communicating with the IAB donor 10, and a mobile IAB node 10M.

[0028] exist Figure 1 In the embodiment, the mobile IAB node 10M is an IAB node that is installed in a car, a bus, etc. and moves. There are a permitted area 30A (service available area) and a permitted area 30B (service available area) in the surrounding area, and terminals 20A and 20B as user equipment (UE) exist in the corresponding areas. According to the present exemplary embodiment, an example in which the mobile IAB node 10M is installed in a car, a bus, etc. is described, but the present invention is not limited thereto. For example, the mobile IAB node 10M can also be installed in an unmanned aerial vehicle (such as a drone) to expand the coverage area.

[0029] Figure 2 is a block diagram illustrating a configuration example of a communication device configuring an IAB donor and an IAB node according to the first exemplary embodiment.

[0030] The communication device 100 includes a control unit 101, a storage unit 102, a wireless communication unit 103, and a communication antenna control unit 104. The communication device 100 also includes a global positioning system (GPS) communication unit 105, a GPS antenna control unit 106, an information acquisition unit 107, and a notification information generation unit 108.

[0031] The control unit 101 controls the operation of the communication device 100. According to the present exemplary embodiment, the control unit 101 corresponds to the acquisition unit and the determination unit. The control unit 101 is configured with, for example, one or more processors, such as a central processing unit (CPU) and a microprocessing unit (MPU), and controls the entire communication device by executing a computer program stored in a random access memory (RAM) as a storage unit 102. The processing performed by the control unit 101 described below with reference to the flowchart can also be implemented using a hardware circuit (such as an application-specific integrated circuit (ASIC) and a field programmable gate array (FPGA)). In addition, the processing described below with reference to the flowchart can also be implemented by cooperation between a hardware circuit and a processor (such as a CPU or an MPU).

[0032] The storage unit 102 stores various information such as cell information, connected terminal information, IAB routing information, and location information in addition to the control program executed by the control unit 101.

[0033] The wireless communication unit 103 performs cellular network communication such as Long Term Evolution (LTE) and fifth generation wireless (5G) compliant with the 3rd Generation Partnership Project (3GPP) (registered trademark) standard.

[0034] The communication antenna control unit 104 controls the wireless communication antenna 104 a used for communication via the wireless communication unit 103 .

[0035] The GPS communication unit 105 receives a signal from a global positioning system (GPS) satellite and acquires position information of a current position including position specific information such as longitude and latitude information.

[0036] The GPS antenna control unit 106 controls the GPS communication antenna 106 a used for communication via the GPS communication unit 105 .

[0037] Various operations in the communication device 100 are performed by the control unit 101 executing a control program stored in the storage unit 102 .

[0038] The information acquisition unit 107 acquires information such as the moving speed and moving distance of the communication device 100 detected by various sensors, and other information. A part of the information acquisition unit 107 may be implemented as a software module implemented by the control unit 101.

[0039] The notification information generation unit 108 generates notification information for notifying the user of the presence of the mobile IAB node 10M (IAB node of the communication device 100 ).

[0040] Figure 3 is a flow chart illustrating processing in a mobile IAB node. Figure 3The processing shown in the flowchart of is an example of processing mainly performed by the control unit 201. A part of the processing such as the transmission processing and the collection processing is performed by the control unit 201 and the control unit 201. Figure 2 Each hardware shown in cooperates to achieve this.

[0041] exist Figure 3 In step S102 of the configuration, the communication device 100 ( Figure 2 ) collects surrounding environment information by the control unit 101 of the storage unit 102. As the environment information, the current position information acquired via the GPS communication unit 105 and the current speed, position, and speed history of the vehicle acquired from the control device of the vehicle on which the mobile IAB node 10M is installed via the information acquisition unit 107 can be used. In addition, the planned route information of the vehicle on which the mobile IAB node 10M is installed can be used as the environment information. The planned route information can be pre-stored in the storage unit 102, or can be received by the information acquisition unit 107 via the network and stored in the storage unit 102.

[0042] In step S104, the control unit 101 determines whether the mobile IAB node 10M is in a state where it can provide services based on the environmental information acquired in step S102. If it is determined that the mobile IAB node 10M is in a state where it can provide services, the process proceeds to step S106, and if it is determined that the mobile IAB node 10M is not in a state where it can provide services, the process proceeds to step S108. In step S104, whether the mobile IAB node 10M is in a state where it can provide services may correspond to whether the current location of the mobile IAB node 10M belongs to any one of the permitted areas including the permitted areas 30A and 30B.

[0043] For example, the control unit 101 may calculate the current position based on the GPS position information acquired via the GPS communication unit 105. The control unit 101 may also calculate the current position of the mobile IAB node 10M using the GPS position information and the current speed, position, and speed history of the vehicle. Alternatively, the control unit 101 may also calculate the current position by combining the speed history of the vehicle with the planned route information.

[0044] The control unit 101 may predict the position of the mobile IAB node 10M at a time very close to the current time, and reflect it in the determination in step S104.

[0045] For example, if it is predicted that the mobile IAB node 10M currently in the permitted area 30A will soon move outside the permitted area 30A based on the current position, the current speed of the vehicle, the planned route information, etc., the determination in step S104 may be negative. In addition, if it is predicted that the mobile IAB node 10M currently outside the permitted area 30A will soon move into the permitted area 30A, the determination in step S104 may be positive.

[0046] In step S106, the control unit 101 determines whether the mobile IAB node 10M is in a state of providing a service to a neighboring UE. If the determination is affirmative, the process is terminated, and if the determination is negative, the process proceeds to step S110.

[0047] In step S110, the control unit 101 starts to send a synchronization signal block physical broadcast channel block (SSB / PBCH) via the wireless communication unit 103, which is notification information of the mobile IAB node 10M generated by the notification information generation unit 108. SSB stands for synchronization signal (SS) / physical broadcast channel (PBCH) block. The notification information may include a system information block (SIB).

[0048] SSB is a synchronization signal periodically sent by a base station including a mobile IAB node to detect the cell frequency and reception timing necessary for communication and is notification information that notifies the user of the main wireless parameters. SSB includes two synchronization signals that are periodically sent, namely, the primary synchronization signal and the secondary synchronization signal. The base station including the mobile IAB node uses SSB to notify system parameters for discovering user terminals and IAB node cells, establishing frame synchronization, and measuring downlink reception quality. Specifically, system parameters such as public land mobile networks (PLMN) and closed access groups (CAG) are notified. In this way, the base station including the mobile IAB node uses SSB to provide the information necessary to achieve initial access and mobility.

[0049] In step S112 , the control unit 101 starts providing a service of causing the mobile IAB node 10M to function as a relay to neighboring UEs through communication via the wireless communication unit 103 , and terminates the processing.

[0050] On the other hand, in step S108, the control unit 101 determines whether the mobile IAB node 10M is in a state of suspending the provision of service to the neighboring UE. If the determination is affirmative, the process is terminated, and if the determination is negative, the process proceeds to step S114.

[0051] In step S114 , the control unit 101 suspends transmission of SSB as notification information of the mobile IAB node 10M via the wireless communication unit 103 .

[0052] In step S116 , the control unit 101 suspends providing the service of the mobile IAB node 10M to the neighboring UE via the wireless communication unit 103 , and terminates the process.

[0053] A series of processes shown in steps S102 to S116 are periodically performed when the mobile IAB node 10M is activated. Thus, the start and stop processes of service provision can be appropriately performed depending on the situation such as whether the mobile IAB node 10M exists in the permitted area 30A or the permitted area 30B.

[0054] As defined in Technical Specification (TS) 38.473, an SSB may specify up to five timings, one SSB for UE access and four SSBs for connecting to neighboring IAB nodes. According to this exemplary embodiment, the SSB that performs start and pause may be configured to stop all of these SSBs. The SSB may also be configured to start or pause only the SSB for UE access while maintaining the mobile IAB node 10M participating in the 5G network to reduce reconnection overhead.

[0055] FIG. 4A to FIG. 4C The change of the operating condition associated with the movement of the mobile IAB node 10M is illustrated.

[0056] As described above, the mobile IAB node 10M is an IAB node that is installed in a car, a bus, etc. and moves. Figure 1 In the case where the mobile IAB node 10M is outside the permitted areas 30A and 30B as in the case shown in (the case where the determination in step S104 is negative), the mobile IAB node 10M does not provide a service and is therefore not connected to the terminals 20A and 20B. At this time, the mobile IAB node 10M is not connected to the terminals 20A and 20B and therefore does not send its own notification information (the determination in step S108 is a positive state).

[0057] like Figure 4A As shown in FIG. 1 , in the case where the mobile IAB node 10M moves and enters the permitted area 30A (the case where the determination in step S104 is affirmative), the mobile IAB node 10M starts providing services. Then, the mobile IAB node 10M provides services to the terminal 20A within the permitted area 30A in response to a request from the terminal 20A. At this time, the mobile IAB node 10M starts sending its own notification information from the time it enters the permitted area 30A (step S110), and sets itself to be able to provide services if the terminal 20A is connected thereto (step S112).

[0058] In addition, the mobile IAB node 10M is connected to the IAB node 10A as the upper IAB node to make itself participate in the 5G network, and participates in the 5G network. The 5G network is an example of a radio access network in which a communication device participates.

[0059] like Figure 4B As shown in, when the mobile IAB node 10M moves further and goes outside the permitted area 30A (the judgment in step S104 is negative), the mobile IAB node 10M terminates the provision of the service (step S116). At this time, the mobile IAB node 10M suspends sending the notification information it has been sending until then.

[0060] In addition, the mobile IAB node 10M is disconnected from the IAB node 10A related to the upper IAB node, and is also disconnected from the terminal 20A, so that it itself leaves the 5G network.

[0061] like Figure 4C As shown in , in the case where the mobile IAB node 10M further moves and enters the permitted area 30B (the case where the determination in step S104 is affirmative), the mobile IAB 10M starts providing services again. Specifically, the mobile IAB node 10M resumes the transmission process of its own notification information (step S110), and transitions to a state where it can provide services if the terminal 20B is connected thereto (step S112).

[0062] In addition, the mobile IAB node 10M connects to the IAB node 10A which is the upper IAB node to make itself participate in the 5G network again, and participates in the 5G network.

[0063] According to the present exemplary embodiment, an example in which the IAB node 10A of the fixed base station is connected as an upper node is described, but another IAB node may be connected as an upper IAB node in each of the licensed areas 30A and 30B. In addition, the mobile IAB node 10M may be connected to an upper IAB node under a different IAB donor rather than the common IAB donor 10 in each of the licensed areas 30A and 30B.

[0064] In addition, the connection destination of the mobile IAB node 10M is not limited to the IAB node of the fixed base station, and it may be connected to another mobile IAB node.

[0065] Figure 5 The diagram shows an example of a sequence in which the mobile IAB node 10M participates in a 5G network when starting provision of a service, etc. This sequence is an example of a 5G network connection sequence of a commonly used IAB node according to the 3GPP (registered trademark) standard defined in Technical Report (TR) 38.401.

[0066] like Figure 5 As shown in FIG. 5 , first, in step S501 , the mobile IAB node 10M sends a radio resource control (RRC) Setup message to the IAB node 10A.

[0067] Upon receiving the message, if the IAB node 10A causes the mobile IAB node 10M as the transmission source to participate in the 5G network, it transmits an initial uplink (UL) RRC message to the IAB donor 10 in step S502.

[0068] When receiving the initial UL RRC message, the IAB donor 10 transmits a downlink (DL) RRC message to the IAB node 10A in step S503. The IAB node 10A, which receives the DL RRC message relayed by the IAB donor 10, notifies the mobile IAB node 10M of an RRCSetup message in step S504.

[0069] Upon receiving the RRCSetup message, the mobile IAB node 10M sends an RRCSetupComplete message to the IAB node 10A in step S505. The IAB node 10A receiving the RRCSetupComplete message relays it and sends a UL RRC message to the IAB donor 10 in step S506.

[0070] In step S507, the IAB donor 10 sends a context setup request message to the IAB node 10A in order to establish within itself the context of the mobile IAB node 10M connected thereto.

[0071] Upon receiving the context setup request message, in step S508 , the IAB node 10A sends a SecurityModeCommand message to the mobile IAB node 10M.

[0072] After sending the SecurityModeCommand message, in step S509 , the IAB node 10A asynchronously sends a context setup response message to the IAB donor 10 .

[0073] In parallel with this, the mobile IAB node 10M transmits a SecurityModeComplete message to the IAB node 10A in step S510 . The IAB node 10A receiving the SecurityModeComplete message relays it and transmits a UL RRC message to the IAB donor 10 in step S511 .

[0074] In step S512, the IAB donor 10 receiving the UL RRC message includes the RRCReconfiguration message in the DL RRC message and sends it to the IAB node 10A. In step S513, the IAB node 10A receiving the DL RRC message relays it and sends the RRCReconfiguration message to the mobile IAB node 10M.

[0075] In step S514, the mobile IAB node 10M sends an RRCReconfigurationComplete message as a response to the RRCReconfiguration message to the IAB node 10A. The IAB node 10A receiving the RRCReconfigurationComplete message relays it and sends a UL RRC message to the IAB donor 10 in step S515.

[0076] Figure 6 An example of a sequence is illustrated in which the mobile IAB node 10M leaves the 5G network when provision of a service is suspended, etc. This sequence is an example of a general 5G network connection sequence of an IAB node according to the 3GPP (registered trademark) standard defined in TR 38.401.

[0077] In the event that an IAB node leaves the 5G network, the IAB donor generally receives a disconnect trigger.

[0078] Figure 6 An example is illustrated in which an environment information notification message from the mobile IAB node 10M serves as a trigger for disconnection. The environment information notification message is, for example, a message for notifying the mobile IAB node 10M of suspension of provision of a service.

[0079] First, in step S601, the mobile IAB node 10M sends a surrounding environment information notification message to the IAB node 10A.

[0080] The IAB node 10A receiving the surrounding environment information notification message relays it and transmits the surrounding environment information notification message to the IAB donor 10 in step S602. Here, it is assumed that the surrounding environment information notification message includes information that the mobile IAB node 10M wishes to leave the 5G network.

[0081] In step S603, the IAB donor 10 receiving the information sends a context release request message to the IAB node 10A to make the mobile IAB node 10M leave the 5G network.

[0082] In step S604, the IAB node 10A that has received the context release request message sends a RRCRelease message to the mobile IAB node 10M. Subsequently, in step S605, the IAB node 10A sends a context release complete message to the IAB donor 10.

[0083] As described above, according to the present exemplary embodiment, the current position of the mobile IAB node 10M is determined based on the environmental information related to the position of the communication device, and the start and suspension of the provision of the service are controlled. Therefore, the execution and suspension of the provision of the service by the mobile IAB node 10M can be appropriately controlled. In other words, in the case where the mobile IAB node 10M is within the service available area, the service is executed, and in the case where the mobile IAB node 10M is outside the service available area, the service is suspended.

[0084] The present disclosure has been described in detail above based on the exemplary embodiments, but the present disclosure is not limited to these specific exemplary embodiments, and various forms that do not depart from the gist of the present invention are also included in the present disclosure.

[0085] For example, according to this exemplary embodiment, the SSB to be notified to the surroundings may be configured to include a flag indicating a suspension notification. The flag indicating the suspension notification is a flag indicating whether the suspension of the service is scheduled to occur soon. For example, if the flag is "1", it indicates that the suspension of the service is scheduled to occur soon, and if the flag is "0", it indicates that the suspension of the service is not scheduled to occur soon. The mobile IAB node 10M determines whether to set the flag to "0" or "1" based on the location information, speed information, and planned route information. The information may be configured to be stored in an optional area such as SIB 1. In addition, the flag may also be configured to be stored in a reserved area of ​​a master information block (MIB) transmitted on the PBCH. In addition, the currently unused SS block candidate resources may also be configured to newly store notification information about the IAB, and the new SSB resources may be configured for notification. In this case, for example, in addition to the currently defined SIBs 1 to SIB 21, SIB 22 allocated to the new SSB resources may also be configured to be used for notification of notification information about the IAB including the above-mentioned flag.

[0086] This flag can be used, for example, to determine whether a terminal or the like as a UE is connected to the mobile IAB node 10M. In addition, this flag can be used, for example, to determine whether a UE already connected to the mobile IAB node 10M switches its connection destination to another base station or IAB node.

[0087] By including this information, in the case where the connection partner is a mobile IAB node, another IAB node or UE as a receiving party can arbitrarily change its behavior.

[0088] According to the present exemplary embodiment, the communication device installed in a car, a bus, etc. is described as an example, but the present disclosure is not limited thereto. It is also possible to incorporate the hardware and software for serving as a communication device into the vehicle itself (such as a car or a bus). In this case, in addition to the communication device for the car or the bus, Figure 2 The hardware shown in FIG. 1 includes hardware for use as an automobile, such as an engine, a frame, tires, and an electronic control unit (ECU) serving as a driving source of the vehicle.

[0089] The present disclosure may also be configured to supply a recording medium storing the program code of the software implementing the above functions to a system or device and to enable a computer (CPU or MPU) of the system or device to read and execute the program code stored in the recording medium. In this case, the program code read out from the storage medium itself implements the functions of the above exemplary embodiments, and the storage medium storing the program code constitutes the present disclosure.

[0090] As storage media for supplying program codes, for example, floppy disks, hard disks, optical disks, magneto-optical disks, compact disk read-only memories (CD-ROMs), CD-readable media (CD-Rs), magnetic tapes, nonvolatile memory cards, ROMs, and digital versatile disks (DVDs) can be used.

[0091] In addition, the above functions can be realized not only by the computer executing the read program code but also by an operating system (OS) running on the computer executing part or all of actual processing based on instructions from the program code. OS stands for Operating System.

[0092] In addition, the program code read out from the storage medium is written into a memory provided on a function expansion board inserted into the computer or a function expansion unit connected to the computer. Then, based on the instructions from the program code, a CPU provided on the function expansion board or the function expansion unit can perform a part or all of the actual processing to realize the above functions.

[0093] According to the above exemplary embodiments, the wireless access method is New Radio (NR), which is a 5G wireless access method, but other access methods such as Long Term Evolution (LTE), sixth generation wireless communication (6G) and higher versions, and Wireless Fidelity (Wi-Fi) may be at least partially applied.

[0094] The present invention is not limited to the above exemplary embodiments, and various modifications and changes may be made without departing from the spirit and scope of the present invention. Therefore, the following claims are attached to disclose the scope of the present invention.

[0095] This application claims priority based on Japanese Patent Application No. 2022-141472 filed on September 6, 2022, the entire contents of which are incorporated herein by reference.

[0096] Description of Reference Numbers

[0097] 10M Mobile IAB Nodes

[0098] 10IAB Donor

[0099] 10A IAB Node

[0100] 20A terminal (UE)

[0101] 20B terminal (UE)

[0102] 30A Permit Area

[0103] 30B License Area

[0104] 100 communication devices

[0105] 101 control unit (acquisition unit, determination unit)

[0106] 102 storage units

[0107] 103 wireless communication unit (transmitting unit)

[0108] 104 Communication antenna control unit

[0109] 105GPS communication unit

[0110] 106GPS antenna control unit.

Claims

1. A communication device, the communication device being used as a mobile integrated access and backhaul (IAB) node in a mobile communication system, the communication device comprising: an acquisition component, the acquisition component being used to acquire information related to the location of the communication device; as well as A control unit configured to distinguish whether to send notification information of the communication device based on the information acquired by the acquisition unit. 2 . The communication device according to claim 1 , wherein the acquired information includes at least one of location information of the communication device, information indicating a speed of the communication device, and planned route information of the communication device.

3. The communication device according to claim 1 or 2, further comprising a determining component, the determining component being configured to determine whether the communication device exists in a service available area based on the information acquired by the acquiring component, in, In a case where the determination component determines that the communication device exists within the service available area, the control component performs control of sending the notification information of the communication device, and in a case where the determination component does not determine that the communication device exists within the service available area, the control component performs control of not sending the notification information of the communication device. 4 . The communication device according to claim 1 , wherein the notification information is transmitted using a synchronization signal / physical broadcast channel block (SSB). 5 . The communication device according to claim 1 , wherein the notification information includes information indicating whether suspension of a service of the communication device is scheduled.

6. The communication device according to claim 3, wherein: In a case where the determination means determines that the communication device exists within a service available area, the control means controls the communication device to participate in a radio access network.

7. The communication device according to claim 6, wherein: In the case where the determining means determines that the communication device exists outside the service available area, the communication device does not participate in the radio access network or leaves the radio access network. 8 . The communication device according to claim 1 , wherein the communication device is a car, and the car further includes an engine as a driving source.

9. A method of communication using a mobile IAB node in a mobile communication system, the method comprising: Acquiring environmental information related to the location of the mobile IAB node; determining whether it is necessary to send notification information of the mobile IAB node based on the environment information acquired in the acquiring; as well as The notification information is sent according to a determination result in the determination.

10. A program for causing a computer configured to cause a communication device to function as a mobile IAB node in a mobile communication system to execute: obtaining information related to the location of the mobile IAB node; and Control of distinguishing whether the communication device transmits notification information is performed based on the information acquired in the acquiring.

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