JP2022082848A - Wireless communication device and wireless communication system - Google Patents

Abstract

To suppress an increase in traffic when communication data is transmitted and received by overhearing of a wireless communication device in an ad hoc network.SOLUTION: A wireless communication device capable of configuring an ad hoc network includes: a reception notification generation unit that generates reception notification of overheard communication data when overhearing communication data whose destination wireless communication device is its own wireless communication device in the case where the wireless communication device can directly communicate with any one of wireless communication devices forming a fixed route and is not a wireless communication device forming part of the fixed route; and a wireless transmission unit that transmits the reception notification to a wireless communication device to which a wireless communication device that has transmitted overheard communication data has directly transmitted the communication data and which forms part of the fixed route.SELECTED DRAWING: Figure 2

Description

The present invention relates to a wireless communication device and a wireless communication system.

Conventionally, it has been known that many networks such as wireless LANs and cellular networks perform communication in an infrastructure mode connected to a specific base station. Then, the base stations form a so-called infrastructure network capable of executing stable communication. The terminal connects to the infrastructure network and executes communication.

For example, in Non-Patent Document 1, the transmitting terminal transmits communication data to the destination terminal via the base station even when a communication partner exists in the same network accommodated by one base station. If the destination terminal for communication exists in an area configured by another base station, communication data is transferred between the base stations, and the communication data is transferred from the base station constituting the area to which the destination terminal belongs to the destination terminal. Is sent. Since there are actually a plurality of base stations, a network can be formed in various forms.

Yamamoto et al., "Study of load balancing method between LTE base stations in various traffic environments", "RCS Study Group, vol.112, no.351, pp.41-46, December 2012"

In the above-mentioned ad hoc network, when communicating, it may be possible to execute wireless communication with a shortened wireless communication path due to overhearing or the like. However, if the terminal whose wireless communication is omitted due to overhear or the like does not transmit the reception notification, the terminal of the next fixed route in the routing order that should have been originally transmitted has been communicated. , Since wireless communication is started, the routing may increase.

The present invention has been made in view of the problems assumed in the related techniques of the prior art. Then, an object of the present invention is to make an appropriate terminal of the communication path recognize that the wireless communication has ended by appropriately transmitting the reception notification even when the communication path is omitted due to over-hearing, which is unnecessary. The purpose is to provide a wireless communication system and the like capable of suppressing such traffic.

A wireless communication device according to an aspect of the present invention capable of configuring an ad hoc network, wherein the wireless communication device can directly communicate with any one of the wireless communication devices forming a fixed route, and forms the fixed route. If the wireless communication device is not a wireless communication device, the reception notification generation unit that generates a reception notification of the overheared communication data when the own wireless communication device overhears the communication data that is the destination wireless communication device. It is preferable that the wireless communication device that forms the fixed route to which the wireless communication device that has transmitted the overheared communication data directly transmits the communication data includes a wireless transmission unit that transmits the reception notification. ..

According to the present invention, even when the communication path is omitted due to over-hear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, and unnecessary traffic is performed. It becomes possible to provide a wireless communication system and the like that can suppress the above.

It is a schematic diagram which shows an example of the wireless communication system which constitutes the network which concerns on this embodiment. It is a schematic diagram which shows an example of the communication path to which the communication data is transferred in the wireless communication system of FIG. 1 which concerns on this embodiment. In the wireless communication system of FIG. 1 according to the present embodiment, it is a schematic diagram showing an example in which a wireless communication device overhearing communication data transmits a reception notification to an appropriate other wireless communication device. (A) It is a schematic diagram which shows an example of the connection information stored in the wireless communication apparatus which concerns on this embodiment. (B) It is a schematic diagram which shows an example of the connection information stored in the wireless communication apparatus which concerns on this embodiment. (C) It is a schematic diagram which shows an example of the connection information stored in the wireless communication apparatus which concerns on this embodiment. (D) It is a schematic diagram which shows an example of the connection information stored in the wireless communication apparatus which concerns on this embodiment. It is a block diagram which shows an example of the structure of the wireless communication apparatus which concerns on this embodiment. It is a flowchart which shows an example of the condition when the state of the wireless communication apparatus which concerns on this embodiment changes. It is a flowchart which shows an example of the transmission operation when the wireless communication apparatus which concerns on this embodiment transmits communication data. It is a flowchart which shows an example of the relay / reception operation when the wireless communication apparatus which concerns on this embodiment relays or receives communication data. It is a schematic diagram which shows an example of the structure of the communication network which concerns on the comparative example 1. FIG. It is a schematic diagram which shows the transmission / reception operation of the terminal of the communication network which concerns on the comparative example of FIG. It is a schematic diagram which shows an example of the structure of the communication network which concerns on the comparative example 2. FIG.

(Overview of wireless communication system configuration)
The wireless communication device of the wireless communication system of the present embodiment has a configuration capable of reducing the number of hops by overhearing. However, in the conventional technique, it is not shown that the terminal in which the wireless communication of the communication path is omitted receives the reception notification when the overhear occurs, and the terminal executes unnecessary wireless communication. There was a possibility that traffic would increase.

Therefore, the wireless communication system of the present embodiment is configured to transmit a reception notification to an appropriate terminal when the destination wireless communication device recognizes that the communication data has been received by overhear, and suppresses an increase in traffic. Has.

(Configuration example of wireless communication system)
As an example, FIG. 1 describes an outline of operation in the topology of an ad hoc network formed by the wireless communication device of the present embodiment. In this specification, the wireless communication device may be referred to as a terminal.

In FIG. 1, the wireless communication system selects terminals frequently used for relay communication in advance, connects the selected terminals having a high communication success rate in a ring shape, and fixes the communication path connected in the ring shape. As a route, the wireless communication system executes wireless communication.

In FIG. 1, terminals 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h form a fixed route connected in a ring shape.

Terminals other than the terminals located on the fixed route communicate wirelessly with any of the terminals forming the fixed route, but do not execute wireless communication with the other terminals. For example, as shown in FIG. The terminal 100a1 communicates directly with the terminal 100a and does not directly communicate with other terminals. Similarly, the terminal 100a2 communicates directly with the terminal 100a and does not directly communicate with other terminals. Similarly, the terminal 100b1 communicates directly with the terminal 100b and does not directly communicate with other terminals. Similarly, the terminal 100c1 communicates directly with the terminal 100c and does not directly communicate with other terminals. Similarly, the terminal 100d1 communicates directly with the terminal 100d and does not directly communicate with other terminals. Similarly, the terminal 100d2 communicates directly with the terminal 100d and does not directly communicate with other terminals. Similarly, the terminal 100e1 communicates directly with the terminal 100e and does not directly communicate with other terminals. Similarly, the terminal 100f1 communicates directly with the terminal 100f and does not directly communicate with other terminals. Similarly, the terminal 100f2 communicates directly with the terminal 100f and does not directly communicate with other terminals. Similarly, the terminal 100g1 communicates directly with the terminal 100g and does not directly communicate with other terminals. Similarly, the terminal 100g2 communicates directly with the terminal 100g and does not directly communicate with other terminals. Similarly, the terminal 100h1 communicates directly with the terminal 100h and does not directly communicate with other terminals. Similarly, the terminal 100h2 communicates directly with the terminal 100h and does not directly communicate with other terminals. Further, in the present specification, the terminals 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100a1, 100a2, 100b1, 100c1, 100d1, and 100d2 may be collectively referred to as the wireless communication device 100. Further, 100e1, 100f1, 100f2, 100g1, 100g2, 100h1, and 100h2 may be collectively referred to as a wireless communication device 100. Further, the terminal forming the fixed route directly communicates only with the next terminal forming the fixed route and the terminal outside the fixed route capable of direct communication. In addition, each terminal stores terminal information to be connected in advance.

(Operation example of wireless communication system)
Further, an example of the wireless communication operation of the wireless communication system according to the present embodiment will be described with reference to FIGS. 2, 3, and 4. FIG. 2 is a schematic diagram showing a communication flow of the wireless communication system according to the present embodiment. FIG. 3 is a schematic diagram showing a flow of reception notification of the wireless communication system according to the present embodiment. FIG. 4 is a schematic diagram showing terminal information stored in each of the wireless communication devices 100 according to the present embodiment. Details of the terminal information will be described later.

As shown in FIG. 2, a case where a transmission request for communication data with the terminal 100d1 as a destination terminal occurs in the terminal 100a2 will be described.

Since the terminal 100a2 is not a terminal forming a fixed route, communication data is wirelessly transmitted to the terminal 100a forming the fixed route according to the terminal information of the terminal 100a2 (see FIG. 4A). If the terminal 100d1, which is the destination terminal, can overhear this wireless transmission, the wireless transmission ends. However, in FIG. 2, it is assumed that the terminal 100d1 cannot overhear the wireless transmission from the terminal 100a2.

The terminal 100a that has received the communication data from the terminal 100a2 compares the destination terminal information of the communication data with the terminal information stored in the terminal 100a, and the terminal that does not form a fixed route in the communication area of the terminal 100a is not the destination terminal. Is determined. Therefore, the terminal 100a wirelessly transmits communication data to the terminal 100b forming a fixed route of the next wireless transmission destination according to the terminal information. If the terminal 100d1, which is the destination terminal, can overhear this wireless transmission, the wireless transmission ends. However, in FIG. 2, it is assumed that the terminal 100d1 cannot overhear the wireless transmission from the terminal 100a.

The terminal 100b that has received the communication data from the terminal 100a compares the destination terminal information of the communication data with the terminal information stored in the terminal 100b, and the terminal that does not form a fixed route in the communication area of the terminal 100b is not the destination terminal. Is determined. Therefore, the terminal 100b wirelessly transmits communication data to the terminal 100c forming a fixed route of the next wireless transmission destination according to the terminal information. Although the terminal 100c receives this wireless transmission, the terminal 100d1 which is the destination terminal can also overhear the wireless transmission. Therefore, the terminal 100d1, which is the destination terminal, transmits a communication data reception notification.

As shown in FIG. 3, the terminal 100d1 which is the destination terminal determines that the terminal immediately before the terminal information stored in the terminal 100d1 is different from the terminal 100b which transmitted the communication data. Then, the terminal 100d1 recognizes that the terminal of the next wireless transmission destination of the terminal 100b is the terminal 100c from the terminal information of the transmission destination of the overheared communication data. Therefore, the terminal 100d1 transmits a communication data reception notification to the terminal 100c.

In FIG. 3, it is determined that the terminal 100d1 of the destination terminal overhearing the communication data from the terminal 100b to the terminal 100c has overheared from the terminal information and the next destination information of the communication data, and the reception notification is sent to the terminal 100c. It shows how to send.

If there is no overhear, the above communication data is scheduled to be transferred in the order of terminal 100a2 → terminal 100a → terminal 100b → terminal 100c → terminal 100d → terminal 100d1. However, when the terminal 100d1 overhears the communication data from the terminal 100b, the terminal 100c → the terminal 100d → the terminal 100d1 becomes unnecessary wireless communication. That is, since the wireless communication of the terminal 100a2 → the terminal 100a → the terminal 100b → the terminal 100d1 and the terminal 100c → (terminal 100d1) → the terminal 100b is actually executed, it is possible to suppress the traffic.

In one example of FIG. 11, the wireless communication device 100 constituting the infrastructure network in the vehicle 10 is shown. The wireless communication device 100 constituting the infrastructure network can be set in advance from a combination that can configure a communication path that is less affected by obstacles such as occupants between the wireless communication device 100 and the installation position of the wireless communication device 100. Is. For example, in FIG. 11, terminals 100i, 100j, and 100k arranged along the body of a vehicle operate as terminals of a fixed route to construct an infrastructure network. The terminals 100i1, 100j2, 100j3, and 100k1 can communicate with one of the terminals 100e, 100f, and 100g that are constructing the infrastructure network. Further, as an example, a front wheel right tire T1, a front wheel left tire T2, a rear wheel left tire T3, and a rear wheel right tire T4 are attached to the vehicle 10.

(Configuration example of wireless communication device)
FIG. 5 is a block diagram showing an example of the configuration of the wireless communication device 100. As shown in FIG. 5, the wireless communication device 100 includes a transmission / reception unit 110, a wireless reception unit 120, a reception data determination unit 130, a reception notification generation unit 140, a transmission destination determination unit 150, a transmission data generation unit 160, and an external I / F unit. It includes 170, a storage unit 180, and a radio transmission unit 190. The antenna unit ANT is an option that may or may not be included in the wireless communication device 100. The wireless communication device 100 can be a general computer including the above blocks. When a general computer executes a control program, the functions shown in FIG. 5 can be realized. Hereinafter, only the parts related to the features in the present embodiment will be described. Therefore, it goes without saying that the wireless communication device 100 includes other functional blocks that are not directly related to the features of the present embodiment.

The storage unit 180 may be a ROM (Read Only Memory), a RAM (Random access memory), a hard disk, or the like. The storage unit 180 can also store various data such as input data, output data, and intermediate data for the wireless communication device 100 to execute processing. Some functions of the wireless communication device 100 can be executed by a CPU (Central Processing Unit).

The transmission / reception unit 110 connects the wireless transmission unit 190 and the antenna unit ANT when the wireless communication device 100 is in the transmission mode, and the wireless reception unit 120 and the antenna when the wireless communication device 100 is in the reception mode. It has a function of connecting to the ANT. Further, when the antenna portion ANT has directivity, it also has a function of controlling the directivity of the antenna portion ANT.

The wireless receiving unit 120 can execute processing such as amplification and demodulation processing of communication data received via the antenna unit ANT. For demodulation, any method can be adopted in the wireless communication system 1000. It is also possible to use the MCS (Modulation Coding Scheme) defined in 802.11. An example of the radio wave received from the antenna unit ANT is a radio wave in the millimeter wave band, but the radio wave is not limited to the radio wave in the millimeter wave band, and a radio wave in any frequency band can be used. be. The communication data received via the antenna unit ANT may include a reception notification generated by another terminal.

The reception data determination unit 130 has a function of determining whether or not the destination terminal of the received data that has been processed by the wireless reception unit 120, such as demodulation processing, is the own terminal. Information about the destination terminal may exist in the header part of the received data, but the information is not limited to this, and the information about the destination terminal can be written in an area other than the header part of the received data. ..

The reception notification generation unit 140 has a function of generating a reception notification when the destination terminal of the received data is the own terminal. The reception notification is not limited to ACK, and the wireless communication system 1000 can set any form as the reception notification.

The destination determination unit 150 has a function of determining a terminal of a destination of transmission data or reception notification, or a terminal of a transfer destination of reception data. The destination determination unit 150 sets the destination terminal of the transmission data as the destination terminal related to the transmission request information, and transmits the transmission data to the next destination terminal with reference to the connection information storage unit 182 described later. That is, when the own terminal is a terminal outside the fixed route, the communication data is transferred to the terminal in the fixed route to which the own terminal belongs. Further, when the own terminal is a terminal in the fixed route and the destination terminal is a terminal in the area belonging to the own terminal, the communication data is transmitted to the terminal in the area. If the local terminal is a terminal in the fixed route and the destination terminal is a terminal outside the area to which the local terminal belongs, the communication data is transferred to the terminal in the next fixed route.

Further, when the destination terminal of the received communication data is the own terminal, the transmission destination determination unit 150 returns the reception notification to the transmission terminal that has transmitted the communication data.

Further, the transmission destination determination unit 150 discards the communication data when the destination terminal of the communication data overheared by the own terminal is not the own terminal. Further, the transmission destination determination unit 150 executes the following processing when the destination terminal of the communication data overheared by the own terminal is the own terminal.
The destination determination unit 150 refers to the connection information storage unit 182, and acquires the information of the terminal to which the overheared communication data transmission terminal should next transmit the communication data. The destination determination unit 150 transmits a reception notification to the terminal to which the overheared communication data transmission terminal should transmit the communication data next, and prevents the terminal from transmitting the communication data. That is, when the terminal receives the reception notification related to the communication data after receiving the communication data, the terminal determines that the communication data has been received by the destination terminal by the override and discards the communication data. Operate.

The transmission data generation unit 160 has a function of generating transmission data as communication data to be transmitted when receiving a transmission request which is information indicating that communication data to be transmitted has been generated from the external I / F unit 170.

The external I / F unit 170 is an input / output interface for communication data to be transmitted / received, and may be an interface with a device such as a sensor connected to the wireless communication device 100 or an electronic device. The ECU (Electronic Control Unit) may be configured by a device connected to the external I / F unit 170 or an electronic device. The electronic device may include a vehicle control device as an in-vehicle device, a vehicle sensing device, a vehicle peripheral information acquisition device, and an electronic device such as an entertainment device. The vehicle control device may include a navigation device and an automatic driving control device.

The storage unit 180 includes a communication data buffer unit 181 and a connection information storage unit 182.

The communication data buffer unit 181 has a function of temporarily storing transmission data such as communication data when a transmission request is generated in the own terminal, communication data when relay transmission is performed, and reception notification generated by the reception notification generation unit 140. Has.

The connection information storage unit 182 has a function of storing information on the terminal to which the information received by the own terminal should be transmitted next, and, in some cases, information on the terminal to which the information to be received by the own terminal should be transmitted. If there is no fixed route termination and the local terminal is a terminal that forms a fixed route, the information of the terminal to which the information to be received by the local terminal should be transmitted and the information received by the local terminal should be transmitted next. The information of the terminal is stored in the connection information storage unit 182.

The terminal information stored in the connection information storage unit 182 is the information of the terminal stored depending on whether the own terminal forms a fixed route or the own terminal does not form a fixed route. The type is different. That is, in the case of a terminal that does not form a fixed route, the terminal that should transmit the information that the own terminal should receive and the terminal that should transmit the information received by the own terminal next are only the terminals that form the fixed route. become. However, in the connection information storage unit 182 of the terminal forming the fixed route, other than the terminal to which the information to be received by the own terminal in the fixed route should be transmitted and the terminal to which the information received by the own terminal should be transmitted next. It stores the information of the terminal that does not form a fixed route with good communication quality with the own terminal. For example, as shown in FIG. 4C, the fixed route terminal 100b stores the information of the fixed route terminal and the information of the terminal 100a to which the information to be received by the own terminal should be transmitted, and the own terminal receives the information. The information of the terminal of the fixed route to be transmitted next and the information of the terminal 100c are stored. Further, the terminal 100b1 which does not form a fixed route having good communication quality with the own terminal to the terminal 100b of the fixed route receives the information of the terminal outside the fixed route to which the own terminal should receive and the information of the terminal outside the fixed route. The information is stored as the information of the terminal outside the fixed route to be transmitted next.

Similarly, as shown in FIG. 4B, the fixed route terminal 100a stores the information of the fixed route terminal and the information of the terminal 100h to which the information to be received by the own terminal should be transmitted, and the own terminal stores the information of the terminal 100h. The information of the terminal of the fixed route to which the received information should be transmitted next and the information of the terminal 100b are stored. Further, the connection information storage unit 182 of the fixed route terminal 100a stores information of a terminal outside the fixed route having good communication quality with the own terminal. As shown in FIG. 4B, the information received by the own terminal as the information of the terminal outside the fixed route to be transmitted, and the information received by the own terminal as the information of the terminal outside the fixed route to be transmitted next. Terminals 100a1 and 100a2 are stored.

The terminal identification information stored in the connection information storage unit 182 may be predetermined information in the wireless communication system 1000. However, when the communication environment changes dynamically, the communication quality is exchanged between terminals at predetermined time intervals and at timings such as before transmitting information, and the communication quality is set to a predetermined value. The identification information of the excess terminal may be updated in the connection information storage unit 182. It should be noted that the predetermined value regarding the communication quality can be predetermined in the wireless communication system 1000. Further, the information of the terminal to which the information to be received by the own terminal should be transmitted and the information of the terminal to which the information received by the own terminal should be transmitted next, which are stored in the connection information storage unit 182, are each of one terminal. Identification information. There is no limitation on the type of communication quality, and as for the identification information of each one terminal, the identification information of the terminal having the best communication quality of any type can be stored in the connection information storage unit 182. Further, the shape of the fixed route can be predetermined or dynamically determined in the wireless communication system 1000.

When the connection information storage unit 182 is included in the terminal that does not form a fixed route, the information of the terminal to which the information received by the own terminal should be transmitted next and the information of the terminal to which the information to be received by the own terminal should be transmitted. The information is identification information of the same terminal forming a fixed route. For example, in the connection information storage unit 182 of the terminal 100a2 that does not form the fixed route shown in FIG. 4A, the information of the terminal to which the received information should be transmitted next and the information of the terminal to which the information to be received should be transmitted are transmitted. In the information, the identification information of the terminal 100a forming the fixed route is stored. Similarly, in the connection information storage unit 182 of the terminal 100d1 that does not form the fixed route shown in FIG. 4 (d), the information of the terminal to which the received information should be transmitted next and the terminal to which the information to be received should be transmitted are transmitted. In the information of, the identification information of the terminal 100d forming the fixed route is stored. Further, the connection information storage unit 182 of the terminal that does not form a fixed route does not store the information of other terminals that do not form a fixed route.

The wireless transmission unit 190 can execute processing such as amplification and modulation processing of communication data transmitted via the antenna unit ANT. Any method can be adopted for the modulation in the wireless communication system 1000. It is also possible to use the MCS (Modulation Coding Scheme) defined in 802.11. An example of radio waves transmitted from the antenna unit ANT is a radio wave in the millimeter wave band, but the radio wave is not limited to the radio wave in the millimeter wave band, and a radio wave in any frequency band can be used. be. The communication data transmitted via the antenna unit ANT may include a reception notification.

The wireless communication system 1000 according to the present embodiment according to the above description can be mounted on a moving body such as a vehicle. When the wireless communication system 1000 is constructed in a vehicle, the terminals constituting the fixed route are installed at a position where the entire vehicle interior can be easily seen. As an example, the terminal constituting the fixed route can be installed at a position where the entire interior of the vehicle can be easily seen from the ceiling portion, the rearview mirror portion, the floor surface, and the like.

According to the above configuration, even if the communication path is omitted due to overhear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, and unnecessary traffic is performed. It becomes possible to provide a wireless communication system and the like that can suppress the above.

(Operation example of state transition of wireless communication device 100)
An operation example of the state transition when the wireless communication device 100 according to the present embodiment operates with reference to FIG. 6 will be described.

In step S601, the wireless communication device 100 determines whether or not there is a communication data transmission request from the external I / F unit 170. When there is a communication data transmission request (step S601: YES), the wireless communication device 100 proceeds to step S602. If there is no communication data transmission request (step S601: NO), the wireless communication device 100 proceeds to step S604.

In step S602, the wireless communication device 100 transmits and receives terminal information to and from another wireless communication device 100, and updates the terminal information to the latest information. By constantly monitoring the status of the terminal by this terminal information update process, stable communication becomes possible. Next, the wireless communication device 100 proceeds to step S603.

That is, in step S602, the wireless communication device 100 confirms the connection status with the other wireless communication device 100. The connection status may include information such as RSSI (Received Signal Strength Indicator) such as radio wave strength indicating communication quality information with the wireless communication device 100. Based on these connection conditions, the wireless communication device 100 updates the terminal information to the latest information. That is, the wireless communication device 100 updates the stored contents of the connection information storage unit 182. The updated contents of the connection information storage unit 182 are shared by all the wireless communication devices 100 in the wireless communication system.

In step S603, the wireless communication device 100 transitions to a mode for executing a transmission terminal process for wireless communication with the wireless communication device of the communication partner shown in the transmission request information related to the transmission request (see FIG. 7). Then, the wireless communication device 100 shifts the state to the idle state or S601.

In step S604, the reception data determination unit 130 of the wireless communication device 100 determines whether or not the communication data has been received. When the communication data is received (step S604: YES), the wireless communication device 100 proceeds to step S605. If the communication data is not received (step S604: NO), the wireless communication device 100 proceeds to step S606.

In step S605, the wireless communication device 100 determines whether or not the received communication data has its own wireless communication device as the destination terminal, and performs relay / reception terminal processing for executing various processes based on the determination result. The state is changed (see FIG. 8). Then, the wireless communication device 100 shifts the state to the idle state or S601.

In step S606, the wireless communication device 100 transmits and receives terminal information to and from another wireless communication device 100, and updates the terminal information to the latest information. By constantly monitoring the status of the terminal by this terminal information update process, stable communication becomes possible. The terminal information update process can be executed by the wireless communication system 1000 at predetermined time intervals. Further, the terminal information update process may be executed every time a predetermined event occurs in the wireless communication system 1000. Further, the predetermined event may be a case where the communication quality of the link state between the wireless communication devices 100 is lower than the predetermined value, or a case where the communication quality exceeds the predetermined value. Further, the wireless communication system 1000 can set an arbitrary value for the predetermined value of the communication quality. Further, as the predetermined value of the communication quality, the wireless communication system 1000 can set an arbitrary value for an arbitrary parameter such as the received power, the received radio wave strength, the PER, the BER, the SNR, the delay time, and the number of hops. .. Then, the wireless communication device 100 shifts the state to the idle state or S601.

(Operation example when the wireless communication device 100 operates as a transmitting terminal)
An operation example when the wireless communication device 100 according to the present embodiment operates as a transmission terminal will be described with reference to FIG. 7.

In step S701, it is determined whether or not the wireless communication device 100 in which the transmission request is generated is one of the terminals forming a fixed route. When the wireless communication device 100 in which the transmission request is generated is one of the terminals forming the fixed route (step S701: YES), the wireless communication device 100 proceeds to step S702. When the wireless communication device 100 in which the transmission request is generated is not one of the terminals forming the fixed route (step S701: NO), the wireless communication device 100 proceeds to step S705.

In step S702, the own terminal forming the fixed route determines whether or not a communication link is established with the destination terminal of the communication data related to the transmission request. When the local terminal forming the fixed route has a communication link established with the destination terminal of the communication data related to the transmission request (step S702: YES), the wireless communication device 100 proceeds to step S703. When the local terminal forming the fixed route does not have a communication link established with the destination terminal of the communication data related to the transmission request (step S702: NO), the wireless communication device 100 proceeds to step S704.

In step S703, since the local terminal forming the fixed route has a communication link established with the destination terminal of the communication data related to the transmission request, the wireless communication device 100 transmits the communication data to the destination terminal. The wireless communication device 100 ends the transmission process and starts the operation of the flowchart showing the state transition of FIG.

In step S704, since the local terminal forming the fixed route does not have a communication link established with the destination terminal of the communication data related to the transmission request, the communication data is transferred after forming the fixed route according to the terminal information. Transfer the communication data to another terminal that should be. The wireless communication device 100 ends the transmission process, and proceeds to step S601 in FIG.

In step S705, since the wireless communication device 100 in which the transmission request is generated is not one of the terminals forming the fixed route, the wireless communication device 100 in which the transmission request is generated uses the fixed route for which the communication link is established. The communication data is transferred to one of the formed terminals. The wireless communication device 100 ends the transmission process, and proceeds to step S601 in FIG.

(Operation example when the wireless communication device 100 operates as a relay / reception terminal)
An operation example in which the wireless communication device 100 according to the present embodiment operates as a relay / reception terminal will be described with reference to FIG.

In step S801, the wireless communication device 100 determines whether or not the destination terminal of the received communication data is the own terminal. When the destination terminal of the received communication data is the own terminal (step S801: YES), the wireless communication device 100 proceeds to step S802. If the destination terminal of the received communication data is not the own terminal (step S801: NO), the wireless communication device 100 proceeds to step S806.

In step S802, since the destination terminal of the received communication data is the own terminal, the wireless communication device 100 executes the reception process of the received communication data. The received communication data may be output to an external electronic device via the external I / F unit 170. Next, the wireless communication device 100 proceeds to step S803.

In step S803, the wireless communication device 100 determines the source terminal of the received communication data from the communication data. Further, the wireless communication device 100 that has received the communication data refers to the terminal information and determines whether or not the previous terminal information matches the transmission source terminal of the received communication data. When the terminal information immediately before the terminal information matches the source terminal of the received communication data (step S803: YES), the wireless communication device 100 ends the process and shows the state transition of FIG. Start the operation of the flowchart. That is, the wireless communication device 100 does not receive the communication data by overhear, but receives it by the assumed regular communication path. If the terminal information immediately before the terminal information does not match the source terminal of the received communication data (step S803: NO), the wireless communication device 100 proceeds to step S804. In this case, the wireless communication device 100 receives the communication data by overhearing.

In step S804, the reception notification generation unit 140 of the wireless communication device 100 generates a reception notification indicating that the communication data has been normally received by overhearing. Next, the wireless communication device 100 proceeds to step S805.

In step S805, the wireless communication device 100 transmits the reception notification generated by the reception notification generation unit 140 to other wireless communication to which the other wireless communication device 100 that has transmitted the communication data received by the override transmits the communication data. It is transmitted to the device 100. Since the terminal information is shared by all the wireless communication devices 100 in the wireless communication system 1000, the overheared wireless communication device 100 can determine the wireless communication device 100 to which the overheared communication data is transmitted. Is. Next, the wireless communication device 100 ends the process and starts the operation of the flowchart showing the state transition of FIG.

In step S806, the wireless communication device 100 determines whether or not the destination terminal of the received communication data is another terminal for which a communication link is established with the own terminal. When the destination terminal of the received communication data is another terminal for which a communication link is established with the own terminal (step S806: YES), the wireless communication device 100 proceeds to step S807. If the destination terminal of the received communication data is another terminal for which a communication link has not been established with the own terminal (step S806: NO), the wireless communication device 100 proceeds to step S808.

In step S807, the wireless communication device 100 transfers the received data to another wireless communication device 100 for which a communication link has been established with the own terminal. Next, the wireless communication device 100 ends the process and starts the operation of the flowchart showing the state transition of FIG.

In step S808, the wireless communication device 100 transfers the received data to the next wireless communication device 100 that forms the next fixed route of the own terminal according to the terminal information of the own terminal. Next, the wireless communication device 100 ends the process and starts the operation of the flowchart showing the state transition of FIG.

(Modification 1)
In the description of the above embodiment, the network constructed by the wireless communication system 1000 installed in the automobile is described as an example. However, the embodiment is not limited to the inside of an automobile, and can be applied to all mesh networks constructed inside moving objects such as trains, airplanes, and ships, and inside structures such as houses and factories. Is.

(Modification 2)
Further, the network form between the base stations is not limited to the form shown in FIG. 1, and the network form between the base stations can be configured in any form. For example, the network form between base stations can be composed of a ring type network, a bus type network, and a P2P type network.

(Modification 3)
In the description of the above embodiment, the wireless communication device 100 forming the fixed route may be installed in the vicinity of the inside of the vehicle such as the body of the vehicle, but the installation position of the wireless communication device 100 forming the fixed route is these. It is not limited to the position. For example, the fixed route may be configured by a wireless communication device 100 installed under the floor, ceiling, or the like of a vehicle having a radio wave environment that is not easily affected by the occupants of the vehicle. Further, the underfloor and the ceiling can be inside the vehicle of the constituent members constituting the body.

(Modification example 4)
In the above description of the embodiment, the case where the wireless communication device 100 forming the fixed route is predetermined in the wireless communication system 1000 has been mainly described. However, at the time of starting the wireless communication system 1000, all the wireless communication devices 100 included in the network send and receive packets for measuring the communication quality to each other, and the wireless communication device 100 having good communication quality is determined as a fixed route. It is also possible. Good communication quality can also refer to the case where the communication quality information is equal to or higher than a predetermined value. The predetermined value is a value at which the wireless communication system 1000 can set an arbitrary value. Further, the communication quality information may include information such as RSSI such as radio wave strength, and information such as BER (bit error rate) and PER (Packet Error Rate). Further, the communication quality information may include information such as SNR (Signal to Noise Ration) and RCPI (Received Channel Power Indicator), information such as success rate, communication delay time, and information on the number of hops. Further, the communication quality may be measured at the time of starting the wireless communication system 1000, at a time interval predetermined by the wireless communication system 1000, at the time of transmitting communication data, and at a predetermined event. Further, the fixed route may be updated at the above measurement timing by the wireless communication device 100 having a good communication quality whose communication quality is equal to or higher than a predetermined value. As described in the embodiment, the predetermined event may be set when the communication quality between any terminals is lower than the predetermined value. Further, the fixed route may be set by the high-priority communication quality information set by the wireless communication system 1000.

(Modification 5)
In the above description of the embodiment, specific data is not described as communication data, but the application is not limited. For example, the communication data may be information such as information on a sensor that detects the state of the moving body, information on controlling the moving body, information on an electronic device mounted on the moving body, and the like. Examples of the sensor include various sensors such as a door open / close detection sensor, a seatbelt sensor, an engine rotation sensor, a vehicle speed sensor, and a brake / accelerator sensor. Further, examples of electronic devices include navigation devices and entertainment devices such as radios and televisions.

(Modification 6)
The transfer direction of the ring-shaped fixed route of FIG. 1 can be set to either clockwise or counterclockwise by the wireless communication system 1000. Further, the arrangement of the wireless communication device 100 of the wireless communication system 1000 is not limited to the above embodiment, and can be arranged at an arbitrary position in a predetermined space. However, it is preferable that the wireless communication device 100 has a wireless quality equal to or higher than a predetermined value with any one of the wireless communication devices 100.

(Comparative example)
A comparative example will be described with reference to FIGS. 9 and 10.

9 and 10 show a communication system in which a transmission request for communication data is generated from the transmission terminal A to the reception terminal D when the transmission terminal A, the relay terminal B, the relay terminal C, and the reception terminal D are present. It is a schematic diagram for demonstrating operation.

The transmitting terminal A directly communicates communication data with the receiving terminal D. When the ACK is transmitted from the receiving terminal D to the transmitting terminal A, the transmitting terminal A determines that the direct communication to the receiving terminal D is successful, discards the communication data, and ends the transmission operation. When the transmitting terminal A does not receive the ACK from the receiving terminal D, the relay terminal B overhearing the direct communication transmits the communication data transmitted from the transmitting terminal A to the receiving terminal D as a proxy. Proxy communication from the relay terminal B to the receiving terminal D is referred to as proxy communication D1. In this case, since the direct communication to the receiving terminal D has not been successful, the transmitting terminal A inputs the communication data into the transmission buffer in order to execute the retransmission process. Therefore, the transmitting terminal A is in a state of waiting for retransmission or waiting for proxy communication completion notification. Since the relay terminal C does not overhear the direct communication, it does not start the process related to the communication data.

In the proxy communication D1, when the relay terminal B receives the ACK from the receiving terminal D, the relay terminal B determines that the proxy communication D1 is successful, discards the communication data, and notifies the transmitting terminal A of the completion of the proxy communication. To send. When the relay terminal B does not receive the ACK from the receiving terminal D, the relay terminal C overhearing the proxy communication D1 transmits the communication data transmitted from the relay terminal B to the receiving terminal D on behalf of the relay terminal B. Proxy communication from the relay terminal C to the receiving terminal D is referred to as proxy communication D2. In this case, since the proxy communication D1 to the receiving terminal D has not succeeded, the relay terminal B inputs the communication data to the transmission buffer in order to execute the retransmission process. Therefore, the relay terminal B is in a state of waiting for retransmission or waiting for relay of another wireless communication. After resending, the relay terminal B discards the communication data regardless of whether or not the ACK from the receiving terminal D has been received.

In the proxy communication D2, when the relay terminal C does not receive the ACK from the receiving terminal D, the relay terminal C determines that the proxy communication D2 has failed, and inputs the communication data to the transmission buffer in order to execute the retransmission process. do. Therefore, the relay terminal C is in a state of waiting for retransmission or waiting for relay of another wireless communication. After resending, the relay terminal C discards the communication data regardless of whether or not the ACK from the receiving terminal D has been received. In the proxy communication D2, when the relay terminal C receives the ACK from the receiving terminal D, the relay terminal C determines that the proxy communication D2 is successful, discards the communication data, and notifies the transmitting terminal A of the completion of the proxy communication. To send. The proxy communication completion notification in this case may be referred to as a proxy communication completion notification DS1.

When the relay terminal C receives the ACK from the transmission terminal A in the proxy communication completion notification DS1, the relay terminal C determines that the wireless communication of the proxy communication completion notification DS1 is successful, and discards the proxy communication completion notification DS1. .. Since the transmitting terminal A has received the proxy communication completion notification DS1 from the relay terminal C, the retransmission is stopped and the communication data is discarded. Since the relay terminal B can determine that the proxy communication data waiting for retransmission has been successfully transmitted / received by another terminal by overhearing, the relay terminal B discards the proxy communication data waiting for retransmission.

In the proxy communication completion notification DS1, when the relay terminal C does not receive the ACK from the transmission terminal A, the relay terminal B overhearing the proxy communication completion notification DS1 executes the following operations. That is, the relay terminal B transmits the proxy communication completion notification DS2 to the transmission terminal A instead of the proxy communication completion notification DS1 transmitted from the relay terminal C to the transmission terminal A. Since the relay terminal B can determine that the proxy communication data waiting for retransmission has been successfully transmitted / received by another terminal by overhearing, the relay terminal B discards the proxy communication data waiting for retransmission. In this case, since the proxy communication completion notification DS1 to the transmission terminal A has not succeeded, the relay terminal C inputs the proxy communication completion notification DS1 to the transmission buffer in order to execute the retransmission process. Therefore, the relay terminal C is in a state of waiting for retransmission or waiting for relay of another wireless communication. After resending, the relay terminal C discards the proxy communication completion notification DS1 regardless of whether or not the ACK from the transmission terminal A is received.

In the proxy communication completion notification DS2, when the relay terminal B receives the ACK from the transmission terminal A, the relay terminal B determines that the wireless communication of the proxy communication completion notification DS2 is successful, and discards the proxy communication completion notification DS2. .. Since the transmitting terminal A has received the proxy communication completion notification DS2 from the relay terminal B, the retransmission is stopped and the communication data is discarded. If the relay terminal B does not receive the ACK from the transmission terminal A in the proxy communication completion notification DS2, the relay terminal B determines that the communication of the proxy communication completion notification DS2 has failed, and the proxy communication is completed for retransmission. Input the notification DS2 to the transmission buffer. Therefore, the relay terminal B is in a state of waiting for retransmission or waiting for relay of another wireless communication. After resending, the relay terminal B discards the proxy communication completion notification DS2 regardless of whether or not the ACK from the transmission terminal A is received.

If the transmitting terminal A does not receive the proxy communication completion notification from any of the terminals, the transmitting terminal A retransmits the communication data. When the retransmission is executed, the communication system repeats the above operation.

However, in this technology, overhear can be used to ensure communication in a short time by another terminal acting on behalf of communication, but communication of terminals that cannot mutually recognize overhear cannot be suppressed, so traffic is tricked. Is likely to increase.

However, according to the present disclosure, even if the communication path is omitted due to overhear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, which is unnecessary. It becomes possible to provide a wireless communication system and the like that can suppress various traffic.

The features of the wireless communication device 100 and the wireless communication system 1000 of the present embodiment will be described below.

The wireless communication device 100 that can configure an ad hoc network according to the first aspect of the present disclosure can directly communicate with any one of the wireless communication devices that form a fixed route, and the wireless communication device that forms a fixed route If not, it is preferable to include the following configuration. It is preferable that the wireless communication device 100 includes a reception notification generation unit 140 that generates a reception notification of the overheared communication data when the own wireless communication device overhears the communication data that is the destination wireless communication device. Further, the wireless communication device 100 includes a wireless transmission unit 190 that transmits a reception notification to the wireless communication device that forms a fixed route to which the wireless communication device that has transmitted the overheared communication data directly transmits the communication data. It is preferable to include.

According to the above configuration, even if the communication path is omitted due to overhear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, and unnecessary traffic is performed. It becomes possible to provide a wireless communication system and the like that can suppress the above.

It is preferable that the wireless communication device 100 according to the second aspect of the present disclosure does not directly communicate with other wireless communication devices that do not form a fixed route.

According to the above configuration, by using a fixed route with good communication quality as a communication route, it is possible to suppress the occurrence of retransmission processing and route search processing due to deterioration of the communication environment due to movement of radio interference objects such as occupants. May be possible. Therefore, it may be possible to suppress deterioration of the communication speed and power consumption of the wireless communication system, and it may be possible to improve the communication performance of the wireless communication system.

It is preferable that the wireless transmission unit 190 of the wireless communication device 100 according to the third aspect of the present disclosure executes the following processing when a transmission request is generated in the own wireless communication device. That is, it is preferable that the wireless transmission unit 190 transmits communication data related to a transmission request by using any one of the wireless communication devices forming a fixed route capable of direct communication as the transmission destination wireless communication device.

According to the above configuration, when a transmission request is made to a wireless communication device outside the fixed route, the fixed route with good communication quality is used, so that the communication speed and communication reliability of the wireless communication system can be improved. It will be possible. In addition, the wireless communication device outside the fixed route can dynamically belong to the communication area of the wireless communication device within any fixed route, so that the communication performance of the wireless communication system can be improved. May be.

A wireless communication device 100 that can form an ad hoc network according to a fourth aspect of the present disclosure can directly communicate with one or more of the wireless communication devices that form a fixed route, and is a wireless communication device that forms a fixed route. In any case, it is preferable to include the following configuration. It is preferable that the wireless communication device 100 includes a reception notification generation unit 140 that generates a reception notification of the overheared communication data when the own wireless communication device overhears the communication data that is the destination wireless communication device. Further, the wireless communication device 100 includes a wireless transmission unit 190 that transmits a reception notification to the wireless communication device that forms a fixed route to which the wireless communication device that has transmitted the overheared communication data directly transmits the communication data. It is preferable to include.

According to the above configuration, even if the communication path is omitted due to overhear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, and unnecessary traffic is performed. It becomes possible to provide a wireless communication system and the like that can suppress the above.

When the wireless communication device 100 capable of configuring an ad hoc network according to the fifth aspect of the present disclosure is any one of the wireless communication devices forming a fixed route, it is preferable to include the following configuration. The wireless communication device 100 is a wireless reception unit that receives a communication data reception notification from the wireless communication device that is the destination wireless communication device when the own wireless communication device receives communication data that is not the destination wireless communication device. It is preferable to include 120. Further, the wireless communication device 100 preferably includes a wireless transmission unit 190 in which the wireless reception unit discards the communication data without transferring the received communication data when the reception notification is received.

According to the above configuration, even when the communication path is omitted due to overhearing, the reception notification can be received by the terminal whose communication should be omitted. As a result, the terminal for which communication should be omitted can recognize that the wireless communication has ended, so that unnecessary traffic can be suppressed without transmitting unnecessary communication data.

When the wireless receiving unit 120 of the wireless communication device 100 that does not form a fixed route according to the sixth aspect of the present disclosure receives communication data from another wireless communication device, it is preferable to execute the following processing. That is, when the destination wireless communication device of the received communication data is a wireless communication device capable of directly communicating with the own wireless communication device, the wireless transmission unit 190 of the wireless communication device 100 forms a fixed route for the communication data. It is preferable to transmit to a wireless communication device that does not.

According to the above configuration, communication data with a wireless communication device in an area capable of direct communication with the own wireless communication device as a destination wireless communication device is quickly transmitted to a wireless communication device in an area with high communication reliability. Will be possible. Therefore, the wireless communication device having the above configuration makes it possible to improve the communication speed and communication reliability of the wireless communication system.

When the wireless receiving unit 120 of the wireless communication device 100 according to the seventh aspect of the present disclosure receives communication data from another wireless communication device, it is preferable to execute the processing in the following cases. .. That is, when the destination wireless communication device of the received communication data is not a wireless communication device that does not form a fixed route capable of directly communicating with the own wireless communication device, the wireless transmission unit 190 preferably performs the following processing. .. That is, it is preferable that the wireless transmission unit 190 transfers the communication data to the wireless communication device that forms a fixed route adjacent to the own wireless communication device.

According to the above configuration, communication data that does not use a wireless communication device in an area that can directly communicate with the own wireless communication device as the destination wireless communication device can be quickly transferred via a fixed route with high communication reliability. It will be possible. Therefore, the wireless communication device having the above configuration makes it possible to improve the communication speed and communication reliability of the wireless communication system.

It is preferable that the communication quality between adjacent wireless communication devices forming a fixed route by executing direct communication according to the eighth aspect of the present disclosure exceeds a predetermined value. In addition, the communication quality between the wireless communication device that does not form a fixed route and the wireless communication device that forms the fixed route, which directly communicates with the wireless communication device that forms the fixed route, also exceeds a predetermined value. Is preferable.

According to the above configuration, the communication quality of the wireless communication device forming the fixed route and the wireless communication device not forming the fixed route can be maintained at an appropriate value, so that the communication reliability of the wireless communication system can be maintained. It becomes possible to improve the sex.

The wireless communication system 1000 according to the ninth aspect of the present disclosure is the wireless communication device 100 according to any one of the first to third aspects that does not form a fixed route, and the fourth aspect to form a fixed route. It is preferable to include the wireless communication device 100 according to any one of the aspects of 7. It is preferable that the wireless communication device 100 that does not form a fixed route performs one-to-one direct communication with the wireless communication device 100 that forms a fixed route.

According to the above configuration, even if the communication path is omitted due to overhear, by appropriately transmitting the reception notification, the appropriate terminal of the communication path is made to recognize that the wireless communication has ended, and unnecessary traffic is performed. It becomes possible to provide a wireless communication system and the like that can suppress the above.

In the wireless communication system 1000 according to the tenth aspect of the present disclosure, the wireless communication device 100 forming a fixed route and the wireless communication device forming a fixed route do not form a fixed route for performing one-to-one direct communication. The wireless communication device 100 is preferably updated. For example, at least one timing when the wireless communication device is activated, when an electronic data transmission request is generated, a predetermined time interval, or a timing when the communication quality between the wireless communication devices falls below a predetermined value. It is preferable that the configuration of the wireless communication system is updated in.

According to the above configuration, the wireless communication device that forms a fixed route and the wireless communication device that does not form a fixed route are updated at an appropriate timing, so that it is possible to improve the communication reliability of the wireless communication system. Become.

The block configuration diagram of FIG. 5 used in the description of the above-described embodiment shows a block of functional units. These functional blocks are realized by any combination of at least one of hardware and software. Further, the method for realizing each functional block is not particularly limited. For example, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices may be directly or indirectly connected. , These may be realized by using a plurality of devices. The functional block may be realized by combining software with one device or a plurality of devices.

When the wireless communication device 100 is composed of a plurality of hardware elements, each functional block is realized by any hardware element or a combination of the hardware elements. Hardware elements include processors, memory, storage, communication devices, input devices, output devices, buses, and the like.

Further, in this case, each function of the wireless communication device 100 is realized by loading predetermined software or a program on hardware such as a processor and a memory. Specifically, each function is realized by loading a predetermined software on the hardware so that the processor performs an operation and controls reading and writing of data in the memory and the storage.

Although the embodiments have been described in detail with reference to the drawings, the present invention is not limited to the contents described in the above embodiments. In addition, the components described above include those that can be easily assumed by those skilled in the art and those that are substantially the same. Further, the configurations described above can be combined as appropriate. In addition, various omissions, substitutions or changes of the configuration can be made without departing from the gist of the present invention.

100 Wireless communication device 110 Transmission / reception unit 120 Wireless reception unit 130 Reception data judgment unit 140 Reception notification generation unit 150 Destination judgment unit 160 Transmission data generation unit 170 External I / F unit 180 Storage unit 181 Communication data buffer unit 182 Connection information storage unit 190 Wireless transmitter 1000 Wireless communication system ANT antenna section

Claims (10)

A wireless communication device that can configure an ad hoc network.
When the wireless communication device can directly communicate with any one of the wireless communication devices forming the fixed route and is not the wireless communication device forming the fixed route, the wireless communication device is not available.
When the local wireless communication device overhears the communication data that is the destination wireless communication device, the reception notification generation unit that generates the reception notification of the overheared communication data, and
A wireless communication device including a wireless transmission unit that transmits a reception notification to a wireless communication device that forms the fixed route to which the wireless communication device that has transmitted the overheared communication data is a partner that directly transmits the communication data. .. The wireless communication device according to claim 1, wherein the wireless communication device does not directly communicate with other wireless communication devices that do not form the fixed route. When a transmission request is generated in the wireless communication device, the wireless transmission unit uses any one of the wireless communication devices forming a fixed route capable of direct communication as the transmission destination wireless communication device. The wireless communication device according to claim 1 or 2, which transmits communication data related to a transmission request. A wireless communication device that can configure an ad hoc network.
When the wireless communication device can directly communicate with one or more of the wireless communication devices forming the fixed route and is any one of the wireless communication devices forming the fixed route, the wireless communication device is available.
When the local wireless communication device overhears the communication data that is the destination wireless communication device, the reception notification generation unit that generates the reception notification of the overheared communication data, and
A wireless communication device including a wireless transmission unit that transmits a reception notification to a wireless communication device that forms the fixed route to which the wireless communication device that has transmitted the overheared communication data is a partner that directly transmits the communication data. .. A wireless communication device that can configure an ad hoc network.
When the wireless communication device is one of the wireless communication devices forming a fixed route,
When the local wireless communication device receives communication data that is not the destination wireless communication device, the wireless receiver that receives the communication data reception notification from the wireless communication device that is the destination wireless communication device, and
A wireless communication device including a wireless transmission unit that discards the communication data without transferring the received communication data when the wireless reception unit receives the reception notification. When the wireless receiving unit receives communication data from another wireless communication device, the destination wireless communication device of the communication data is a wireless communication device that does not form a fixed route capable of directly communicating with the own wireless communication device. for,
The wireless communication device according to claim 5, wherein the wireless transmission unit transmits the communication data to the wireless communication device that does not form a fixed route. When the wireless receiving unit receives communication data from another wireless communication device, the destination wireless communication device of the communication data is not a wireless communication device that does not form a fixed route capable of directly communicating with the own wireless communication device. for,
The wireless communication device according to claim 5 or 6, wherein the wireless transmission unit transfers the communication data to the wireless communication device forming a fixed route adjacent to the own wireless communication device. The communication quality between another adjacent wireless communication device forming the fixed route and the wireless communication device forming the fixed route, which directly communicates with the wireless communication device forming the fixed route, is a predetermined value. Beyond,
The communication quality between the wireless communication device that does not form the fixed route and the wireless communication device that forms the fixed route that directly communicates with the wireless communication device that forms the fixed route also exceeds a predetermined value. The wireless communication device according to any one of claims 1 to 7. The wireless communication device according to any one of claims 1 to 3, which does not form a fixed route.
The wireless communication device according to any one of claims 4 to 7 that forms the fixed route, and the wireless communication device that does not form the fixed route is one-to-one with the wireless communication device that forms the fixed route. A wireless communication system that performs direct communication. The wireless communication device that forms the fixed route and the wireless communication device that does not form the fixed route that performs one-to-one direct communication with the wireless communication device that forms the fixed route are electronic when the wireless communication device is started. The ninth aspect of claim 9, wherein when a data transmission request is generated, the data is updated at a predetermined time interval or at least one timing when the communication quality between wireless communication devices falls below a predetermined value. Wireless communication system.

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