Wireless communication device, wireless network management device, control method, and program

Abstract

To detect a possibility that transmission of a signal in a wireless communication system may interfere with communication in other wireless communication systems.SOLUTION: A wireless communication device includes first wireless communication means for performing wireless communication with a base station and second wireless communication means for performing wireless communication between wireless communication devices without going through the base station. The wireless communication device receives, from a second wireless communication device via the second wireless communication means, a message giving a notification that a notification signal transmitted from a first base station belonging to a first wireless communication system to which the wireless communication device belongs has been received by the second wireless communication device belonging to a second wireless communication system different from the first wireless communication system, and notifies the first base station of the reception of the message via the first wireless communication means.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wireless communication device, a wireless network management device, a control method, and a program for collecting information on similar wireless communication systems operating in the vicinity. [Background technology]

[0002] Patent Document 1 discloses a system in which a plurality of wireless cellular network systems are installed in the same area and a wireless system to be used is selected in consideration of the load situation.

[0003] Furthermore, Patent Document 2 discloses a system that uses a wireless communication medium for wireless communication (direct wireless communication) between devices without going through a base station to access a backbone wireless network via another wireless communication device.

[0004] There are also control systems that perform unmanned operations by independently installing such wireless cellular network systems on private land such as farms and quarries and linking devices equipped with cellular communication functions within the private land. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2020-156042 [Patent Document 2] Japanese Patent Publication No. 2020-114031 Summary of the Invention [Problem to be solved by the invention]

[0006] In the control method described in Patent Document 1, in order to prevent interference with wireless communication devices of other systems, the licensee of the wireless network system must make adjustments to secure wireless channels for allocation to the wireless communication devices, which places a burden on the licensee.

[0007] Thus, when constructing a wireless communication system, it has been an issue to detect whether signal transmission in one wireless communication system may interfere with communication in another wireless communication system.

[0008] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a technique for making it possible to detect whether signal transmission in a wireless communication system may interfere with communication in another wireless communication system. [Means for solving the problem]

[0009] In order to achieve the above object, a wireless communication device according to one aspect of the present invention comprises: a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; The annunciation signal transmitted from the first base station is Connected to a second base station a receiving means for receiving a message from the second wireless communication device via the second wireless communication means, the message notifying that the message has been received by the second wireless communication device; a notification means for notifying the first base station via the first wireless communication means that the message has been received by the receiving means; Equipped with a first wireless communication system including the wireless communication device and the first base station, and the second wireless communication device and the second base station The second wireless communication system is characterized by being different from the first wireless communication system. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a technique for making it possible to detect that transmission of a signal in a wireless communication system may interfere with communication in another wireless communication system. [Brief explanation of the drawings]

[0011] [Figure 1]FIG. 1 is a schematic diagram showing a situation in which interference occurs between wireless communication devices belonging to different wireless communication network systems. [Figure 2] 1 is a schematic diagram illustrating a wireless communication system according to an embodiment of the present invention; [Figure 3] Functional block diagram of a wireless communication device according to the present embodiment. [Figure 4] FIG. 10 is a sequence diagram illustrating an example of processing executed in the wireless communication system according to the first embodiment when wireless communication devices are in close proximity to each other; [Figure 5] FIG. 10 is a diagram showing an example of the format of a notification message that notifies that a notification signal of another wireless communication system, transmitted in direct wireless communication according to the first embodiment, has been received; [Figure 6] FIG. 10 is a diagram showing an example of a format of a message used by the wireless communication device according to the first embodiment to notify the base station that a notification message has been received in direct wireless communication; [Figure 7] 5 is a flowchart showing an example of processing executed by the wireless communication device according to the first embodiment. [Figure 8] 10 is a flowchart illustrating an example of additional control performed by a wireless communication device that receives a wireless communication system detection notification message via direct wireless communication from a wireless communication device according to the first embodiment. [Figure 9] 10 is a flowchart illustrating an example of additional control performed by a wireless network management device that receives an operation information notification message for a wireless communication system via wireless communication via a base station from a wireless communication device according to the first embodiment. [Figure 10] FIG. 10 is a sequence diagram illustrating an example of processing executed when wireless communication devices are close to each other in the wireless communication system according to the second embodiment. [Figure 11] FIG. 10 is a diagram showing an example of a format of an operation information notification message of a wireless communication system transmitted in direct wireless communication according to the second embodiment; [Figure 12] 10 is a flowchart illustrating an example of additional control performed by a wireless communication device that receives an operation information notification message for a wireless communication system via direct wireless communication from a wireless communication device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the present invention, and not all of the combinations of features described in the embodiments are necessarily essential to the solution of the present invention.

[0013] First Embodiment First, a situation in which interference occurs between different wireless communication systems will be described with reference to Fig. 1. In this embodiment, the wireless communication system will be described as an agricultural system to which a wireless local network (local 5G wireless communication network) conforming to the fifth generation mobile communication system is applied.

[0014] Agricultural systems are expected to issue instructions for automatic control to agricultural machinery operating on farmland and collect information such as the operating status of agricultural machinery. In such agricultural systems, the area where the agricultural machinery is located can be used as a service area, and it can be redundant to have the entire area as a service area at all times. For this reason, systems are being introduced that provide wireless communication networks by moving local 5G wireless base stations to match the area where the agricultural machinery is located (operating location).

[0015] Figure 1 shows an example of a system configuration in which an automatic control solution for agricultural machinery (tractors, etc.) compatible with local 5G wireless communication control is introduced on adjacent farmlands A and B. The agricultural machinery (tractors, etc.) is also expected to operate autonomously on public roads, and supports direct wireless communication between wireless communication devices without going through a base station where system synchronization operation via satellite communication is guaranteed in order to obtain information from roadside devices such as road signs and traffic lights. In this embodiment, direct wireless communication will be described as wireless communication between wireless communication devices using an NR-PC5 interface.

[0016] The local 5G wireless communication system 1A for farmland A is composed of agricultural machinery equipped with a wireless network management device 10A, a wireless base station (BS) 11A, and a wireless communication device (UE) 12A. The local 5G wireless communication system 1B for farmland B is composed of agricultural machinery equipped with a wireless network management device 10B, a BS 11B, and a UE 12B. The UEs 12A and 12B (hereinafter sometimes referred to indistinguishably as wireless communication device 12 or UE 12) installed in the agricultural machinery support communication using NR-PC5, a direct wireless communication interface for supporting autonomous driving of agricultural machinery. UE 12 also supports communication using Uu, a wireless communication interface via a base station for accessing agricultural work management servers, etc.

[0017] Considering coexistence with NR-PC5, BS 11A and 11B (hereinafter, sometimes referred to as BS11 without distinction) and UE 12 are compatible with the satellite positioning system GNSS13 and are capable of acquiring location information and time information.

[0018] Furthermore, by synchronizing the system clock used by the wireless communication device to operate based on the time information obtained from GNSS, the timing deviation range of wireless time division multiplexing (TDD) communication is reduced.

[0019] Farmlands A and B are divided into plots that can be covered by one BS 11 (six plots in the example in Figure 1), and farm work is carried out on each plot using an autonomous tractor equipped with a UE 12.

[0020] When farm work on one plot of farmland A is completed, the wireless base station BS-A 11 moves to plot 101 where the next farm work is scheduled to be carried out (a plot adjacent to plot 102 where farm work is being carried out on farmland B) and then restarts.

[0021] When agricultural work is being carried out in plots 101 and 102 and a service area is formed by BS11 in an adjacent plot, radio interference may occur between wireless communication devices in an asynchronous local 5G wireless communication system depending on the transmission and reception pattern (TDD pattern).

[0022] FIG. 2 shows a wireless communication system according to this embodiment that is applied to an agricultural system of a local 5G wireless communication system.

[0023] When the agricultural machine equipped with the UE 12B receives a notification signal transmitted from the BS 11A at a work location in the farmland B, the UE 12B transmits a notification message to the UE 12A via direct wireless communication to notify the UE 12A of the reception of the notification signal. By notifying the BS 11A of the reception of the notification message from the UE 12B, the UE 12A can adjust communication parameters so that the communication between the BS 11A and the UE 12A does not interfere with the communication between the UE 12B and the BS 11B.

[0024] Next, functional blocks of the UE 12 will be described with reference to FIG.

[0025] The UE 12 includes a central processing unit (CPU) 300, a display unit 301, an operation unit 302, a non-volatile storage unit 303 such as a memory card, a subscriber identity module (SIM) function unit 304, a power supply unit 305, a RAM 306, and a ROM 307. The UE 12 also includes an NR Uu communication unit 308 used when communicating with the BS 11, and an NR PC5 communication unit 309 used when communicating with the BS 11. The UE 12 also includes a system information storage unit 310 that stores information about broadcast signals received from a wireless communication system different from the wireless communication system to which the UE 12 belongs. The CPU 300 is a control unit that controls the entire UE, and loads and executes programs stored in the ROM 307 or the non-volatile storage unit 303 into the RAM 306. The display unit 301 is a display device for providing predetermined notifications to the user, and is a touch display when the UE 12 is a smartphone, for example. The operation unit 302 is a user interface (UI) that accepts operations from a user, and is, for example, a touch display when the UE 12 is a smartphone.

[0026] The SIM function unit 304 is a module that has subscriber identification information for connecting to the wireless communication system 1 as the UE 12 and executes authentication processing when connecting to the wireless communication system 1 .

[0027] Next, with reference to FIG. 4, an example of processing that is executed in the wireless communication system according to the first embodiment when wireless communication devices come into proximity will be described.

[0028] First, in S401, the BS 11A broadcasts a system broadcast signal, and the UE 12A receives the system broadcast signal. Upon receiving the system broadcast signal, the UE 12A establishes a connection with the BS 11A using a known technique such as a random access procedure.

[0029] Then, in S402, a control signal instructing the agricultural machine equipped with UE 12A to move is transmitted via BS 11A, and the agricultural machine equipped with UE 12A moves to a section adjacent to system B. BS 11A also moves to the corresponding section.

[0030] It is assumed here that UE 12B has established a connection with BS 11B, the agricultural machine on which UE 12B is installed is operating in section 102 of Figure 2, and the agricultural machine on which UE 12A is installed is operating in section 101 of Figure 2.

[0031] Next, in S403, the BS 11A broadcasts a system broadcast signal in the section after the movement, and the UE 12A and the UE 12B receive the system broadcast signal.

[0032] Next, in S404, the UE 12B acquires information contained in the system broadcast signal received from the BS 11A and determines whether the broadcast signal is from the same wireless communication system as the BS 11B to which the UE 12B is connected. If it is determined that the broadcast signal is from a wireless communication system different from the BS 11B, the UE 12B transmits a discovery announcement message, which is a message format for broadcast notification in direct wireless communication, to the UE 12A in S405.

[0033] The UE 12A, which has received the discovery announcement message from the UE 12B in S405, compares the discovery announcement message with the reception history of the broadcast signal received from the BS 11A in S406. If the comparison shows that the broadcast signal included in the reception history of the broadcast signal received from the BS 11A has also been received by the UE 12B, the UE 12A determines that the broadcast signal from the BS 11A in which the UE 12A participates has been received by a wireless communication device in another wireless communication system.

[0034] If it is determined that the system broadcast signal from the BS 11A in which the UE 12A participates has been received by a wireless communication device of another wireless communication system, the UE 12A registers the UE 12A with the wireless network management device 10A in S407 and proceeds to S408, where it transmits a message (Usage Information Reporting message) indicating that the system broadcast signal from the BS 11A in which the UE 12A participates has been received by a wireless communication device of another wireless communication system.

[0035] Next, the process proceeds to S409, where the radio network management device 10A detects interference with other radio communication systems from the information received in S407, and in S410 the AMF of the radio network management device 10A instructs the NG-RAN to perform processing to prevent interference.

[0036] Next, in S411, the NG-RAN of the radio network management device 10A transmits an interference prevention instruction, which will be described later, to the BS 11A.

[0037] Next, a format of a message of a wireless communication system transmitted in direct wireless communication according to this embodiment will be described with reference to Fig. 5. Fig. 5 is an example of a message of a wireless communication system using the direct communication protocol NR-PC5 for local 5G.

[0038] Destination identifier 501 is an area for specifying a multicast ID or groupcast ID that specifies a destination wireless communication device, and in this embodiment, for example, a multicast ID that can be received by a plurality of wireless communication devices in the system is set.

[0039] The sender identifier 502 is an area for specifying an identifier that can identify the sender wireless communication device, and in this embodiment, a layer 2 ID is set. The message type 503 indicates the type of message using NR-PC5, and in this embodiment, the message type is set to a value indicating "Direct Discovery Announcement."

[0040] Next, payload 504 stores information about the broadcast signal received by the wireless communication device transmitting message 500. Payload 504 stores, as payload header information, Neighborhood Uu Cell Info 541 indicating the total number of detected neighboring wireless base stations and information element 542 indicating the number of pieces of information to be notified for each base station. Payload 504 also includes received PLMN-ID information 543 including identification information of BS 11A that is the source of the broadcast signal, and received signal information 544 including information such as the received signal quality, channel, and slot of the broadcast signal. Payload 504 also includes Received GNSS Info 545 including at least one of location information and time information of the wireless communication device that received the broadcast signal. When one payload reports the reception of broadcast signals from multiple wireless base stations, multiple combinations of received PLMN-ID information, received signal information, and Received GNSS Info are stored in the payload, as shown in FIG. 5 .

[0041] Note that Received Signal Info 544 and Received GNSS Info 545 may be determined based on a synchronization signal obtained from the GNSS.

[0042] Next, with reference to FIG. 6, an example of the format of a message used by wireless communication device 12 to notify a wireless base station that it has received a notification message in direct wireless communication will be described.

[0043] The notification message in FIG. 6 is used when the UE 12A transmits a notification message (Usage Information Reporting message) to the radio network management device 10A in S408.

[0044] Destination identifier 601 is a Public Land Mobile Networks-Identifier (PLMN-ID) of the destination of the Usage Information Reporting message. An identifier of the UE 12A is set in source identifier 602, for example, the IMSI of the UE 12A is set. Message type 603 is information indicating the type of message, and in this embodiment, a value indicating that this is a Usage Information Reporting is set. Payload 604 is set with the same information as payload 504 received in FIG. 5, so description thereof will be omitted.

[0045] Next, a flowchart showing an example of processing executed by the wireless communication device 12 according to the first embodiment will be described with reference to Fig. 7. The processing in Fig. 7 will be described assuming that it is executed when the UE 12B receives a system annunciation signal.

[0046] First, in S701, the UE 12B identifies the PLMN-ID information included in the received broadcast signal. Then, in S702, the UE 12B determines whether the PLMN-ID included in the broadcast signal matches the PLMN-ID of the base station 11B of the wireless communication system to which the UE 12B subscribes.

[0047] If it is determined that the PLMN-ID included in the received system broadcast signal matches the PLMN-ID of the base station 11B of the wireless communication system to which the UE 12B subscribes (Y in S702), the UE 12B ends the processing shown in Fig. 7. If it is determined that the PLMN-ID included in the received broadcast signal does not match the PLMN-ID of the base station 11B of the wireless communication system to which the UE 12B subscribes (N in S702), the UE 12B proceeds to processing at S703.

[0048] In S703, the UE 12B determines, based on the broadcast signal, the possibility of interference to the system that the UE 12B participates in. For example, the UE 12B determines the received field strength and the signal-to-noise ratio (SN ratio) of the received broadcast signal.

[0049] Next, in S704, the UE 12B determines whether there is a high possibility of interference with the system 1B in which the UE 12B participates. In one example, the UE 12B determines whether the signal strength of the system broadcast signal received from the BS 11A is greater than a predetermined threshold. For example, the UE 12B estimates that there is no possibility of interference when the received field strength of the broadcast signal is lower than the field strength specified in the system. If the received field strength exceeds the field strength, the UE 12B checks information about the wireless channel used in the system, which is notified in an information element in the broadcast signal.

[0050] If the UE 12B determines that the possibility of interference is high (Y in S704), the UE 12B proceeds to S705, and if the UE 12B determines that the possibility of interference is not high, the UE 12B proceeds to S706.

[0051] In S706, the UE 12B holds the announcement information waiting to be transmitted. In S705, based on the received system broadcast signal, the UE 12B sets neighboring system detection information, which notifies the BS 11A that a wireless communication device of another wireless communication system has received the system broadcast information, as the announcement information. In other words, if the UE 12B receives broadcast signals from base stations of multiple other wireless communication systems within a predetermined period, the UE 12B sets multiple pieces of neighboring system detection information as the announcement information.

[0052] Next, in S707, a discovery announcement message in which announcement information is set is transmitted.

[0053] Next, an example of a process executed by the UE 12A when the UE 12A receives a discovery announcement message from the UE 12B via direct wireless communication will be described with reference to Fig. 8. The process in Fig. 8 will be described assuming that it is executed when the UE 12A receives a discovery announcement message from the UE 12B.

[0054] First, in S801, the UE 12A acquires announcement information of the received discovery announcement message, and in S802, determines whether or not the announcement information includes neighboring system detection information.

[0055] If UE 12A determines that the announcement information includes neighboring system detection information (Y in S802), it proceeds to S803, and if it determines that the announcement information does not include neighboring system detection information, it proceeds to S805.

[0056] In S805, the UE 12A executes a control process for the UE corresponding to the existing announcement information, and ends the process of FIG.

[0057] In S803, the UE 12A determines whether or not the neighboring system detection information contains a notification that the UE 12A has detected a system broadcast signal of the wireless communication system 1A in which the UE 12A participates. If the discovery announce message contains the neighboring system detection information notifying that the UE 12A has received a broadcast signal of the wireless communication system 1A in which the UE 12A participates (Y in S803), the UE 12A proceeds to S804. In S804, the UE 12A transmits the announcement information to the wireless network management device 10A via a Usage Information Reporting message. If the discovery announce message contains the neighboring system detection information notifying that the UE 12A has detected a system broadcast signal of a wireless communication system in which the UE 12A does not participate (N in S803), the UE 12A ends the processing of FIG. 8.

[0058] Next, an example of processing executed by the radio network management device 10A upon receiving a Usage Information Reporting message from the UE 12A will be described with reference to FIG.

[0059] The process shown in FIG. 9 is executed by the radio network management device 10A that receives a Usage Information Reporting message from the UE 12A of the radio communication system 1A.

[0060] First, in S901, radio network management device 10A checks the message type 603. If in S902 the message type is Usage Information Reporting (Y in S902), radio network management device 10A advances the process to S903. If the message type is not Usage Information Reporting (N in S902), radio network management device 10A advances the process to S906 and executes processing corresponding to the existing message.

[0061] In S903, the radio network management device 10A determines whether or not there is a high possibility that the transmission from the BS 11A will interfere with other systems. For example, if the value of the received signal strength (Received Signal Info) of the broadcast signal transmitted from the BS 11A, acquired from the UE 12B, is equal to or greater than a predetermined threshold, the radio network management device 10A may determine that there is a high possibility that the transmission from the BS 11A will interfere with other systems.

[0062] In addition, it may also be determined that there is no interference when the TDD pattern for C-plane communication that receives the broadcast signal is synchronized with that of other wireless communication systems and the frequency channel for U-plane communication that receives the discovery announcement message is different from that of other wireless communication systems.

[0063] If it is determined that there is a high possibility that transmission from BS 11A will interfere with other systems (Y in S903), the radio network management device 10A proceeds to S904 and performs interference avoidance processing. In this embodiment, interference avoidance processing includes adjusting communication parameters such as reducing the transmission power of BS 11A, adjusting the directivity of the antenna of BS 11A, changing the TDD slot allocation, and changing the frequency channel used for communication such as the U-plane communication channel. The radio network management device 10A selects communication parameters according to the content of the detection information of the radio communication system, and instructs BS 11A to apply the selected communication parameters via the NG-RAN of the radio network management device 10A.

[0064] As described above, according to this embodiment, the radio network management device can detect that the movement of a radio base station under its management may cause interference with a radio communication device of another radio communication system. This enables the radio network management device to execute a corresponding process for the radio base station under its management to avoid interference, thereby preventing interference with other systems.

[0065] Second Embodiment In this embodiment, a process will be described in which the wireless communication device 12A transmits a discovery request message requesting announcement information and collects the reception status of nearby wireless base stations as a response message to the discovery request message. Note that the same reference numerals will be used for the same configurations, functions, and processes as those in the first embodiment, and descriptions thereof will be omitted.

[0066] An example of processing executed in the wireless communication system according to this embodiment when a plurality of wireless communication devices are in close proximity will be described with reference to FIG.

[0067] The processing in steps S401 to S404 is the same as that described above with reference to FIG. 4, and therefore the description thereof will be omitted.

[0068] In S1001, the UE 12A transmits a discovery request message at a predetermined time interval via direct wireless communication. The UE 12B, which has received the discovery request message, transmits a discovery response (for search response) message reporting the received system broadcast signal to the UE 12A in S1002.

[0069] The subsequent processes from S406 to S411 are the same as those described in FIG. 4, and therefore will not be described again.

[0070] Next, with reference to FIG. 11, the format of the discovery response message sent in S1102 of FIG. 10 will be described.

[0071] The discovery response message includes a destination identifier 1101 , a source identifier 1102 , a message type 1103 , and a payload 1104 .

[0072] Destination identifier 1101 indicates the destination of the discovery response message, and is set to the unicast ID of the UE 12A that transmitted the discovery request message. Source identifier 1102 is an area that specifies a layer 2 ID that can identify the source wireless communication device. Message type 1103 indicates the type of signaling using NR-PC5, and in this embodiment, the signaling type is set to a value that indicates "Direct Discovery Response."

[0073] Next, payload 1104 stores announcement information including information for notifying the TDD pattern in the wireless communication system. Payload 1104 stores, as payload header information, Neighborhood Uu Cell Info 1141 indicating the total number of detected neighboring wireless base stations and information element 1142 indicating the number of pieces of information to be notified for each base station. Payload 1104 also stores received PLMN-ID information 1143 including identification information of BS 11A, the source of the received broadcast signal, and reception quality information 1144 including information on the quality, channel, slot, etc. of the broadcast signal. Payload 1104 also stores received GNSS information 1145 including at least one of location information and time information of the wireless communication device that received the broadcast signal. When one payload reports reception of broadcast signals from multiple wireless base stations, multiple combinations of received PLMN-ID information, reception quality information, and received GNSS information are stored in the payload, as shown in FIG. 5 .

[0074] Next, an example of a process executed by the UE 12A will be described with reference to Fig. 12. The process shown in Fig. 12 is executed when the UE 12A transmits a discovery request message using NR-PC5.

[0075] First, in S1201, the UE 12A waits until it receives a discovery response message. When it receives the discovery response message (Y in S1201), the process proceeds to S1202, where it acquires information in the discovery response message.

[0076] The subsequent processing steps of S1203 to S1206 are the same as the processing steps of S802 to S805 in FIG. 8, and therefore the description thereof will be omitted.

[0077] As described above, according to this embodiment, even when message processing is used to transmit and receive messages over an NR-PC5 communication medium, a radio network management device can detect that a radio communication system controlled by the radio network management device is interfering with another radio communication system due to the relocation of a radio base station under its control. This enables the radio network management device to execute processing to avoid radio interference, such as controlling the transmission power from the base station, and enables interference avoidance without the operation of a licensee of the radio network system.

[0078] <Other embodiments> In the above description, the NR-PC5 interface is used for direct wireless communication and the NR Uu interface is used for wireless communication with a base station. However, other wireless communication technologies can be used. For example, a wireless LAN interface conforming to the IEEE 802.11 standard may be used for direct wireless communication. Also, a wireless PAN interface conforming to the IEEE 802.15 standard may be used for wireless communication with a base station.

[0079] Furthermore, in the present embodiment, the wireless communication system 1 has been described as having one BS 11 and one UE 12, but may have a plurality of BSs 11 and a plurality of UEs 12.

[0080] The present invention can also be realized by supplying a program that realizes one or more functions of the above-described embodiments to a system or device via a network or a storage medium, and having one or more processors in the computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC) that realizes one or more functions.

[0081] The invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0082] 10A, 10B: Wireless network management device, 11A, 11B: Wireless base station, 12A, 12B: Wireless communication device

Claims

1. A wireless communication device, a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; a receiving means for receiving, from a second wireless communication device via the second wireless communication means, a message notifying that a notification signal transmitted from a first base station has been received by the second wireless communication device connected to the second base station; a notification means for notifying the first base station via the first wireless communication means that the message has been received by the receiving means; Equipped with A wireless communication device, characterized in that a first wireless communication system including the wireless communication device and the first base station is different from a second wireless communication system including the second wireless communication device and the second base station.

2. A wireless communication device, a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; a notification means for, when receiving, via the first wireless communication means, a notification signal transmitted from a second base station included in a second wireless communication system different from a first wireless communication system in which the wireless communication device is included, notifying a second wireless communication device included in the second wireless communication system via the second wireless communication means that a message notifying that the notification signal has been received; A wireless communication device comprising:

3. 3. The wireless communication device according to claim 1, wherein the message uses a message format for broadcast notification.

4. 3. The wireless communication device according to claim 1, wherein the message uses a message format for a search response.

5. 5. The wireless communication device according to claim 1, wherein the message includes a received signal quality of the received broadcast signal.

6. 6. The wireless communication device according to claim 1, wherein the second wireless communication means is a PC5 interface of a fifth generation mobile communication system, and the first wireless communication means is a Uu interface of a fifth generation mobile communication system.

7. 7. The wireless communication device according to claim 1, wherein the message includes at least one of location information and time information acquired by positioning using satellite communication.

8. The wireless communication device according to any one of claims 1 to 7, further comprising a determination means for determining whether the device transmitting the message and the device receiving the message are included in different wireless communication systems, and if it is determined that the device transmitting the message and the device receiving the message are included in the same wireless communication system, the notification means does not issue a notification.

9. A wireless communication device described in any one of claims 1 to 8, characterized in that the first wireless communication system and the second wireless communication system have different TDD patterns.

10. a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; A control method for a wireless communication device comprising: receiving, via the second wireless communication means, from the second wireless communication device, a message notifying that a notification signal transmitted from the first base station has been received by the second wireless communication device connected to the second base station; notifying the first base station via the first wireless communication means that the message has been received; Including, A control method, characterized in that a first wireless communication system including the wireless communication device and the first base station is different from a second wireless communication system including the second wireless communication device and the second base station.

11. a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; A control method for a wireless communication device comprising: A control method characterized by including, when receiving, via the first wireless communication means, a notification signal transmitted from a second base station included in a second wireless communication system different from a first wireless communication system in which the wireless communication device is included, notifying a second wireless communication device included in the second wireless communication system via the second wireless communication means that a message notifying that the notification signal has been received.

12. a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; A program executed by a wireless communication device comprising: a receiving step of receiving, from a second wireless communication device connected to a second base station, a message notifying that the notification signal transmitted from the first base station has been received by the second wireless communication device via the second wireless communication means; a notification step of notifying the first base station via the first wireless communication means that the message has been received; Including, A program characterized in that a first wireless communication system including the wireless communication device and the first base station is different from a second wireless communication system including the second wireless communication device and the second base station.

13. a first wireless communication means for performing wireless communication with a base station; a second wireless communication means for performing wireless communication between wireless communication devices without passing through a base station; A program executed by a wireless communication device comprising: A program characterized by including a notification step of, when receiving, via the first wireless communication means, a notification signal transmitted from a second base station included in a second wireless communication system different from the first wireless communication system in which the wireless communication device is included, notifying a second wireless communication device included in the second wireless communication system via the second wireless communication means that a message notifying that the notification signal has been received.

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