JP4874158B2 - COMMUNICATION METHOD AND TERMINAL DEVICE USING THE SAME - Google Patents

Description

  The present invention relates to a communication technique, and more particularly to a communication method in an ad hoc network and a terminal device using the same.

  An ad hoc network is a self-supporting and distributed network that includes a terminal device as a component without depending on a base station device or a wired network. In an ad hoc network, terminal devices are equal to each other, and information exchange is performed by executing multihop. Such an ad hoc network routing method includes a table driving method, an on-demand method, and a hybrid method. In the table driving method, each terminal device maintains a routing table in which the destination of the packet signal is associated with the next hop destination. Each terminal device determines the next hop destination from the destination of the packet signal while referring to the routing table. Note that the routing table is periodically updated by a control packet signal. Examples of table driving methods are DSDV (Destination Sequence Distance Vector), WRP (Wireless Routing Protocol), CGSR (Clusterhead Gateway Switch Routing), and OLSR (Optimized Linking Route).

  In the on-demand method, a terminal device that is a source of information discovers a route to a destination when requesting transfer of a packet signal. First, the terminal device of the information source learns the reverse route to the terminal device of the information generation source by transferring the packet signal for inquiry by the flooding method, and the packet signal for inquiry The destination terminal device that received the message also responds. Based on the route thus discovered, the packet signal is transferred from the source terminal device to the destination terminal device. Examples of the on-demand method are AODV (Ad hoc On demand Distance Vector), DSR (Dynamic Source Measured Routing Algorithm, RDAR (Temporarily Ordered Routed Algorithm) Routing). The hybrid method is a method in which a table driving method and an on-demand method are combined (for example, see Non-Patent Document 1).

In addition, in an ad hoc network, a technique for simplifying setting of a terminal device has been proposed. The predetermined terminal device holds communication setting information, and a tag is placed in the immediate vicinity of the IC card reader / writer mounted on the terminal device. As a result, the IC card reader / writer transmits communication setting information by executing non-contact communication with the tag. Also, communication setting information is transmitted to another terminal device by executing a procedure opposite to that described above between the tag and the IC card reader / writer mounted on the other terminal device (for example, Patent Document 1).
Kenichi Mase, Keisuke Nakano, Masakazu Sengoku, Shoji Shinoda, “Ad Hoc Network”, Journal of the Institute of Electronics, Information and Communication Engineers, Japan, February 2001, 84, 2, p. 127-134 JP 2004-7351 A

  Considering the convenience of the user, it is desirable that the procedure for connecting the terminal device to the ad hoc network is easy. On the other hand, since the ad hoc network is formed by a plurality of terminal devices, security measures are required in consideration of the influence on other terminal devices. In order to improve security, a role that should approve the participation of a new terminal device in the ad hoc network is assigned to one of a plurality of terminal devices forming the ad hoc network (hereinafter referred to as the relevant device). A terminal device to which a role is assigned is called a “registration organization”). In order to improve the ease of the connection procedure, the connection procedure is performed by pressing the button provided in the new terminal device within a predetermined period after the button provided in the registration authority is pressed down. It is executed when

  Under such circumstances, the present inventor has come to recognize the following problems. When at least two ad hoc networks exist in the vicinity, an ad hoc network is generated by integrating these ad hoc networks. At that time, registration authorities in each of at least two ad hoc networks exchange information with each other. However, even if the registration authorities can communicate directly with each other, there may be a case where at least two terminal devices included in each of the ad hoc networks cannot directly communicate with each other. That is, there are terminal devices that cannot communicate even if they belong to the same ad hoc network.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication technique for executing communication between terminal devices included in different ad hoc networks even when different ad hoc networks are integrated.

  In order to solve the above problems, a terminal device according to an aspect of the present invention includes a communication unit that performs communication while forming an ad hoc network with another terminal device, and an ad hoc network formed in the communication unit. When a role that should approve participation of a new terminal device is assigned, a reception unit that receives a participation request from the new terminal device via the communication unit, and an approval for the participation request received by the reception unit A processing unit that executes processing and a notification unit that notifies a result of the approval processing executed in the processing unit. When the communication unit is assigned a role to approve participation of a new terminal device in an ad hoc network, the communication unit is assigned another role to approve participation of a new terminal device in another ad hoc network. The routing table is exchanged with the terminal device.

  Another aspect of the present invention is a communication method. This method includes a step of performing communication while forming an ad hoc network with another terminal device, and a role that should approve participation of a new terminal device in the ad hoc network is assigned a new one. A step of accepting a participation request from a terminal device, a step of executing an approval process for the accepted participation request, and a role to approve participation of a new terminal device in an ad hoc network, Exchanging routing tables with other terminal devices to which a role to approve participation of a new terminal device in an ad hoc network is assigned.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, even when different ad hoc networks are integrated, communication between terminal devices included in them can be executed.

  Before describing the present invention in detail, an outline will be described. Embodiments described herein relate generally to a communication system that executes an ad hoc network formed by a plurality of terminal devices. In the ad hoc network, any one of a plurality of terminal devices is set as the above-described registration organization. In addition, when two ad hoc networks exist close to each other and registration organizations included in each network can directly communicate with each other, it is assumed that they are integrated. However, some terminal devices included in each of the two ad hoc networks cannot communicate directly. The communication system according to the embodiment of the present invention performs the following processing so that communication can be performed between such terminal devices.

  Registration authorities included in each of the two ad hoc networks exchange routing tables with each other. Further, the exchanged routing tables are exchanged in each ad hoc network. As a result, communication is enabled between terminal devices included in different ad hoc networks and between terminal devices that cannot communicate directly.

  The communication system mainly includes (1) a process for connecting a new terminal device to an ad hoc network (hereinafter referred to as “connection process”), and (2) a routing table generation process in the ad hoc network (hereinafter referred to as “generation process”). ), (3) Data signal transfer processing (hereinafter referred to as “transfer processing”) in the ad hoc network based on the routing table is executed. The above-described approval process is included in the connection process (1).

  FIG. 1 shows a configuration of a communication system 100 according to an embodiment of the present invention. The communication system 100 includes a first terminal device 10a, a second terminal device 10b, a third terminal device 10c, a fourth terminal device 10d, a fifth terminal device 10e, a sixth terminal device 10f, The terminal device 10g is included. In addition, the Nth terminal device 10 n is about to be included in the communication system 100.

  The plurality of terminal devices 10, for example, the first terminal device 10a to the seventh terminal device 10g, perform communication by forming an ad hoc network. Note that the terminal device 10 configuring the ad hoc network is not limited to the first terminal device 10a to the seventh terminal device 10g. Further, the plurality of terminal devices 10 correspond to, for example, a wireless LAN system compliant with a standard such as IEEE 802.11. In addition, as described above, the routing method in the ad hoc network only needs to correspond to a known technology such as a table driving method, an on-demand method, and a hybrid method. For example, in the case of a table driving method, The routing table is updated.

  One of the plurality of terminal devices 10, for example, the third terminal device 10c is assigned a role to approve the participation of the new terminal device 10 in the ad hoc network in addition to the communication function in the normal ad hoc network. It has been. That is, the third terminal device 10c corresponds to the aforementioned registration organization. Here, although the processing at the registration authority will be described later, the registration authority can be said to be a component having the authority to issue or cancel the admission qualification to the ad hoc network. Further, although the function of the registration organization is provided in the terminal device 10 other than the third terminal device 10c, it is assumed that it is suspended at present. Here, for the sake of clarity, it is assumed that the communication system 100 includes one registration authority.

  The new terminal device 10, that is, the Nth terminal device 10 n requests participation in the ad hoc network formed by the plurality of terminal devices 10. Here, the N-th terminal device 10n requests the registration organization to participate, and becomes a constituent element of the communication system 100 when participation is permitted by the registration organization. In the following description, for convenience, the Nth terminal apparatus 10n may be referred to as “requesting side” and the registration authority may be referred to as “response side”.

  FIG. 2 shows the configuration of the terminal device 10. The terminal device 10 includes a wireless unit 12, a modem unit 14, a processing unit 16, a control unit 18, a storage unit 20, an operation unit 22, a monitor 24, and a speaker 26. FIG. 1 shows a plurality of terminal devices 10 and further shows terminal devices 10 corresponding to the request side and the response side, but all the terminal devices 10 are as shown in FIG. It has a configuration.

  The radio unit 12 performs communication while forming an ad hoc network with another terminal device 10. As a reception process, the radio unit 12 performs frequency conversion on a radio frequency signal received via an antenna to generate a baseband signal. Further, the radio unit 12 outputs a baseband signal to the modem unit 14. In general, baseband signals are formed by in-phase and quadrature components, so two signal lines should be shown, but only one signal line is shown here for clarity. Shall. The wireless unit 12 also includes an LNA (Low Noise Amplifier), a mixer, an AGC, and an A / D conversion unit.

  As a transmission process, the radio unit 12 performs frequency conversion on the baseband signal input from the modem unit 14 to generate a radio frequency signal. Further, the radio unit 12 transmits a radio frequency signal from the antenna. The wireless unit 12 also includes a PA (Power Amplifier), a mixer, and a D / A conversion unit.

  The modem unit 14 demodulates the baseband signal from the radio unit 12 as a reception process. Further, the modem unit 14 outputs the demodulated result to the processing unit 16. Further, the modem unit 14 performs modulation on the signal from the processing unit 16 as transmission processing. Further, the modem unit 14 outputs the modulated result to the radio unit 12 as a baseband signal. When the terminal apparatus 10 supports an OFDM modulation scheme such as the IEEE802.11a standard, the modem unit 14 also executes FFT as a reception process and IFFT as a transmission process. When the terminal apparatus 10 supports a spread spectrum method such as the IEEE 802.11b standard, the modem unit 14 also performs despreading as a reception process and also performs spreading as a transmission process. Further, when the terminal apparatus 10 supports a MIMO scheme such as IEEE802.11n, the modem unit 14 also performs adaptive array signal processing as reception processing, and also performs distribution processing into a plurality of streams as transmission processing.

  The processing unit 16 performs digital signal processing on the signal from the modem unit 14 and the signal to the modem unit 14. Here, an example of digital signal processing is encoding of error correction as transmission processing and decoding of error correction as reception processing. The digital signal processing is not limited to this. Further, the processing unit 16 outputs the result of executing digital signal processing on the signal from the modem unit 14 to the control unit 18, and inputs the signal that is the source of the signal to the modem unit 14 from the control unit 18.

  The control unit 18 controls the operation of the entire terminal device 10. The processing executed by the control unit 18 is mainly classified into (4) data input / output processing in addition to the above-described (1) connection processing, (2) generation processing, and (3) transfer processing. Here, for convenience of explanation, explanation will be given in the order of (4), (2), (3), and finally (1) will be explained. First, (4) data input / output processing will be described. As an output process, the control unit 18 receives the result of the digital signal processing from the processing unit 16 and outputs the result to the monitor 24 and the speaker 26. In addition, as an input process, the control unit 18 receives an instruction signal from the operation unit 22 and outputs data corresponding to the instruction signal to the processing unit 16. Here, the operation unit 22 includes buttons and the like. Further, when the terminal device 10 is formed so as to be connected to a personal computer, the operation unit 22 may be a keyboard and a mouse provided in the personal computer.

  Next, (2) generation processing will be described. As described above, a known technique may be used to generate the routing table, but the control unit 18 stores the generated routing table in the storage unit 20. FIG. 3 shows the data structure of the routing table stored in the storage unit 20. As shown in the figure, a destination address column 30, a hop destination address column 32, and a hop number column 34 are included. Also, information other than these may be included. Here, in the destination address column 30 and the hop destination address column 32, the addresses are indicated as “A1”, “B1”, etc., but actually, for example, indicated by an IP address or the like. The same applies to the number of hops in the hop number column 34. Returning to FIG.

  Next, (3) transfer processing will be described. As described above, a known technique may be used for the transfer process. The control unit 18 acquires the destination address of the packet signal received from the wireless unit 12 via the processing unit 16. Further, referring to the routing table stored in the storage unit 20, the control unit 18 specifies a hop destination address corresponding to the acquired destination address. Further, the control unit 18 transmits a packet signal from the processing unit 16 via the wireless unit 12 to the identified hop destination address.

  Next, (1) connection processing will be described. The connection process is executed between the request-side terminal device 10 and the response-side terminal device 10, and here, after explaining the processing of the control unit 18 in the request-side terminal device 10, the response-side terminal device Processing of the control unit 18 in the apparatus 10 will be described. The request-side terminal device 10 corresponds to the Nth terminal device 10n in FIG. 1, and the response-side terminal device 10 corresponds to the third terminal device 10c in FIG.

  When the control unit 18 in the requesting terminal device 10 detects that the button on the operation unit 22 has been depressed by the user, the control unit 18 enters the request mode. When in the request mode, the control unit 18 wirelessly transmits from the processing unit 16 to the registration authority so as to transmit a packet signal indicating a request for participation in the ad hoc network (hereinafter referred to as “request signal”). The unit 12 is controlled. Thereafter, the processing unit 16 from the wireless unit 12 receives a packet signal indicating permission to participate (hereinafter referred to as “permission signal”) from the registration authority that has transmitted the request signal. The permission signal is input to the control unit 18. As a result, the control unit 18 enters a communication mode. In the communication mode, the control unit 18 controls the wireless unit 12 to the processing unit 16 to perform communication by participating in the ad hoc network.

  When the control unit 18 in the terminal device 10 on the responding side detects that a predetermined button on the operation unit 22 is pushed down by the user, the control unit 18 enters the approval mode. The approval mode is a state in which the approval process can be executed. In the approval mode, the control unit 18 receives a request signal from the requesting terminal device 10 over a predetermined period from the wireless unit 12 through the processing unit 16. The control unit 18 executes an approval process for the received request signal. Here, a known technique may be used for the approval process. For example, after exchanging the public key with the requesting terminal device 10 from the wireless unit 12 via the processing unit 16, the control unit 18 executes authentication processing and identification processing for the requesting terminal device 10. Here, the “device password” may be used for the authentication process.

  When the control unit 18 permits the participation, the control unit 18 transmits a permission signal from the processing unit 16 to the requesting terminal device 10 via the wireless unit 12. On the other hand, when the control unit 18 rejects the participation, the control unit 18 transmits a rejection signal from the processing unit 16 to the requesting terminal device 10 via the wireless unit 12. After a certain period of time, the control unit 18 enters the communication mode. In the communication mode, the control unit 18 controls the wireless unit 12 to the processing unit 16 to perform communication by participating in the ad hoc network.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it is realized by a program having a communication function loaded in the memory. Describes functional blocks realized by collaboration. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  The operation of the communication system 100 configured as above will be described. FIG. 4 is a sequence diagram showing a connection procedure in the communication system 100. The button of the Nth terminal device 10n is pushed down (S10), and the button of the third terminal device 10c is also pushed down (S12). The Nth terminal apparatus 10n transmits a request signal to the third terminal apparatus 10c (S14). The third terminal device 10c executes an approval process for the Nth terminal device 10n (S16). The third terminal apparatus 10c transmits a permission signal to the Nth terminal apparatus 10n (S18). Further, the third terminal apparatus 10c updates the routing table (S20).

  Below, the structure of the communication system which expanded the communication system 100 is demonstrated. Here, a communication system in which a plurality of communication systems 100 exist independently and are integrated (hereinafter referred to as “integrated system”) is assumed. Here, for the sake of clarity, it is assumed that the integrated system includes two communication systems 100. In addition, each communication system 100 executes the processing as described above. In particular, in the connection processing, a button in the response-side terminal device 10 is pressed down, and a button in the request-side terminal device 10 is pressed down. Started by. By integrating these communication systems 100, the communicable area is expanded. However, since it is originally formed as another communication system 100, it is desirable that the integrated system can be separated into the original communication system 100. Therefore, the terminal device 10 is configured as follows.

  FIG. 5 shows a configuration of another communication system 200 that extends the communication system 100. The communication system 200 includes a first ad hoc network 202 and a second ad hoc network 204. The first ad hoc network 202 includes a first registration organization 50a, a first terminal device 10a, and a second terminal device 10b, and the second ad hoc network 204 includes a second registration organization 50b, a third terminal device 10c, and a fourth terminal device. A terminal device 10d is included. Here, the first registration organization 50a and the second registration organization 50b are collectively referred to as the registration organization 50. The communication system 200 corresponds to the aforementioned integrated system, and the first ad hoc network 202 and the second ad hoc network 204 correspond to the aforementioned communication system 100.

  The registration organization 50 corresponds to the third terminal device 10c of FIG. 1, and is the terminal device 10 that can execute the function of the registration organization. Here, for the sake of clarity, the third terminal device 10c in FIG. 1 is specified as the registration institution 50, but the configuration of the registration institution 50 is the same as that of the terminal device 10 in FIG. When the control unit 18 included in the registration organization 50 receives an instruction from the user via the button of the operation unit 22, the control unit 18 enters the above-described approval mode. Moreover, the control part 18 can perform a connection process with respect to the new terminal device 10 by becoming approval mode. On the other hand, the control unit 18 periodically transmits a notification signal. This notification signal is a signal for informing the presence of the user and includes identification information given to the user.

  A notification signal transmitted by one of the plurality of registration agencies 50 may be received by the other. For example, in FIG. 5, the notification signal transmitted from the first registration institution 50a is received by the second registration institution 50b. The control unit 18 included in the second registration organization 50b does not enter the approval mode when receiving an instruction from the user via the button of the operation unit 22 for a certain period after receiving the notification signal. It becomes request mode. On the other hand, when the control unit 18 included in the first registration organization 50a receives an instruction from the user via the button of the operation unit 22, the control unit 18 enters the approval mode as described above. That is, when an instruction from the user is received via the button of the operation unit 22, the approval mode is set when the notification signal is not received, while the request mode is set when the notification signal is received. become. In the request mode, the control unit 18 included in the second registration organization 50b transmits a request signal from the processing unit 16 via the wireless unit 12.

  When receiving the request signal from the wireless unit 12 via the processing unit 16, the control unit 18 included in the first registration organization 50a executes a connection process. When permitting the connection, the control unit 18 transmits a permission signal from the processing unit 16 via the wireless unit 12. On the other hand, the control unit 18 included in the second registration organization 50 b receives the permission signal from the wireless unit 12 via the processing unit 16. The control unit 18 exchanges a routing table with the first registration organization 50a. Specifically, the control unit 18 creates information by collecting information indicating that it is the registration organization 50 and a routing table stored in the storage unit 20. Further, the control unit 18 transmits the created information from the processing unit 16 via the wireless unit 12 to the first registration organization 50a. Further, the control unit 18 receives the routing table transmitted from the first registration organization 50 a via the wireless unit 12 and the processing unit 16. Finally, the control unit 18 stores the received routing table in the storage unit 20.

  The control unit 18 also executes communication between the first ad hoc network 202 and the second ad hoc network 204 while using the routing table in the second ad hoc network 204 and the routing table in the first ad hoc network 202. To do. Since such a transfer process is a known technique, a description thereof will be omitted here, but when the transfer is executed across different ad hoc networks, the registration authority 50 is routed. On the other hand, the same applies to the first registration organization 50a.

  FIG. 6 is a sequence diagram illustrating a routing table exchange procedure in the communication system 200. The first registration organization 50a notifies a notification signal (S100). When the button of the second registration institution 50b is pushed down (S102), the second registration institution 50b is changed to the request mode (S104). On the other hand, the button of the first registration organization 50a is also pushed down (S106). The second registration institution 50b transmits a request signal to the first registration institution 50a (S108). The first registration institution 50a executes an approval process for the second registration institution 50b (S110). The first registration institution 50a transmits a permission signal to the second registration institution 50b (S112). The first registration organization 50a and the second registration organization 50b exchange routing tables (S114).

  FIG. 7 is a flowchart showing a routing table exchange procedure in the registration agency 50 on the request side. FIG. 7 corresponds to the processing in the second registration organization 50b of FIG. The control unit 18 receives the notification signal from the wireless unit 12 via the processing unit 16 (S140). If the control unit 18 does not detect pressing of the button of the operation unit 22 within a certain period (N in S142), the control unit 18 stands by. On the other hand, if the control unit 18 detects pressing of the button of the operation unit 22 within a certain period (Y in S142), the control unit 18 changes to the request mode (S144). The control unit 18 transmits a request signal from the processing unit 16 via the wireless unit 12 (S146). If the permission signal is received from the wireless unit 12 via the processing unit 16 (Y in S148), the control unit 18 exchanges the routing table (S150). On the other hand, if the permission signal is not received from the wireless unit 12 via the processing unit 16 (N in S148), the process is terminated.

  FIG. 8 is a flowchart showing a routing table exchange procedure in the registration agency 50 on the response side. FIG. 8 corresponds to the processing in the first registration organization 50a of FIG. The control unit 18 notifies the notification signal from the processing unit 16 via the wireless unit 12 (S160). If the controller 18 does not detect pressing of the button on the operation unit 22 (N in S162), the controller 18 stands by. On the other hand, if the control unit 18 detects pressing of the button of the operation unit 22 (Y in S162), the control unit 18 changes to the approval mode. The control unit 18 receives a request signal from the wireless unit 12 via the processing unit 16 (S164). When the control unit 18 permits the connection (Y in S166), the control unit 18 transmits a permission signal from the processing unit 16 via the wireless unit 12 (S168). Further, the control unit 18 exchanges the routing table (S170). On the other hand, if the connection is not permitted (N in S166), the control unit 18 transmits a rejection signal from the processing unit 16 via the wireless unit 12 (S172). Thereafter, the process is terminated.

  FIG. 9 is a sequence diagram showing a data signal transfer procedure in the communication system 200. The first terminal device 10a transmits a data signal to the first registration organization 50a (S180). The first registration organization 50a transmits a data signal to the second registration organization 50b while referring to the routing table (S182) (S184). The second registration authority 50b transmits a data signal to the third terminal device 10c while referring to the routing table (S186) (S188).

  According to the embodiment of the present invention, since the routing table is exchanged with another ad hoc network, even when different ad hoc networks are integrated, communication between terminal devices included in them can be executed. In addition, since one of the registration agencies is in the request mode, it can be connected to another registration agency. In addition, since only the registration authority exchanges the routing table between different ad hoc networks, the route between the different ad hoc networks can be clearly defined. In addition, since a route is formed between different ad hoc networks so as to pass through the registration organization, separation into the original ad hoc network can be easily realized. Also, since different ad hoc networks are integrated, the area can be expanded. In addition, since the area is expanded, the convenience for the user can be improved.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

  In the embodiment of the present invention, the terminal device 10 performs the connection process and the transfer process while using the same radio unit 12 and modem unit 14. That is, both processes are executed using the wireless LAN. However, the present invention is not limited to this. For example, another wireless unit 12 and a modem unit 14 may be used for connection processing and transfer processing. That is, the wireless LAN is used for the transfer process, but another communication system may be used for the connection process. The reverse is also possible. According to this modification, the degree of freedom of the configuration of the communication system can be improved.

It is a figure which shows the structure of the communication system which concerns on the Example of this invention. It is a figure which shows the structure of the terminal device of FIG. It is a figure which shows the data structure of the routing table memorize | stored in the memory | storage part of FIG. It is a sequence diagram which shows the connection procedure in the communication system of FIG. It is a figure which shows the structure of another communication system which expanded the communication system of FIG. It is a sequence diagram which shows the exchange procedure of the routing table in the communication system of FIG. FIG. 6 is a flowchart showing a routing table exchange procedure in the requesting registration organization of FIG. 5. 6 is a flowchart showing a routing table exchange procedure in the registration agency on the response side in FIG. 5. It is a sequence diagram which shows the transfer procedure of the data signal in the communication system of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Terminal device, 12 Radio | wireless part, 14 Modulator / demodulator, 16 Processing part, 18 Control part, 20 Storage part, 22 Operation part, 24 Monitor, 26 Speaker, 100 Communication system.

Claims (2)

A communication unit that performs communication while forming an ad hoc network with another terminal device; and
When a role that should approve participation of a new terminal device in the ad hoc network formed in the communication unit is assigned, when the first mode is received by receiving an instruction from a user via a button, the communication A reception unit that receives a participation request from a new terminal device via the unit;
A processing unit that executes an approval process for the participation request received in the reception unit;
A notification unit for notifying the result of the approval process executed in the processing unit;
When receiving an instruction from a user via a button, the control unit that causes the reception unit, the processing unit, and the notification unit to execute processing;
When the communication unit receives a notification signal from another terminal device to which a role to approve participation of a new terminal device in another ad hoc network is received, the communication unit receives the notification signal for a certain period after receiving the notification signal. When the control unit receives an instruction from the user and enters the second mode, a request for participation is issued to another terminal device to which a role to approve participation of a new terminal device in another ad hoc network is assigned. And a request unit for transmitting
The reception unit receives participation permission from another terminal device that has transmitted the participation request in the request unit in the second mode,
When the communication unit is assigned a role to approve participation of a new terminal device in an ad hoc network, the communication unit receives participation permission in the accepting unit, and allows the new terminal device to participate in another ad hoc network. Exchange routing tables with other terminal devices that are assigned roles to be approved,
Wherein, in a state not receiving a broadcast signal, it receives an instruction from the user through a button, determines the execution of the first mode of processing, Oite in a state of receiving the broadcast signal, When an instruction from the user is received via the button, execution of the second mode process is determined ,
The communication unit uses the routing table in the ad hoc network generated in the first mode and the routing table in the other ad hoc network generated when the other terminal device is in the first mode. A terminal device that also executes communication between an ad hoc network and another ad hoc network . Executing communication while forming an ad hoc network with another terminal device; and
When a role that should approve participation of a new terminal device in the ad hoc network is assigned, a request for participation from the new terminal device is accepted when the first mode is established by receiving an instruction from the user via a button. Steps,
Executing an approval process for the accepted participation request;
A step of executing a predetermined process when receiving an instruction from a user via a button;
When a notification signal is received from another terminal device to which a role to approve the participation of a new terminal device in another ad hoc network is received, an instruction from the user is given for a certain period after the reception. A step of transmitting a participation request to another terminal device to which a role to approve participation of a new terminal device in another ad hoc network is assigned when the second mode is accepted.
In the case of the second mode, a step of receiving participation permission from another terminal device that has transmitted the participation request;
When a role that should approve participation of a new terminal device in an ad hoc network is assigned, a role that should approve participation of a new terminal device in another ad hoc network is assigned when a participation permission is received. Exchanging routing tables with other terminal devices ;
While using the routing table in the ad hoc network generated in the first mode and the routing table in the other ad hoc network generated when the other terminal device is in the first mode, Performing communication with an ad hoc network ,
In the step of executing the predetermined process, when an instruction from the user is received via a button in a state where the notification signal is not received, the execution of the first mode process is determined and the notification signal is received. Oite state, receives an instruction from the user through a button, a communication method characterized by determining the execution of the second mode of operation.

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