JP2011049929A - Terminal device and communication network system with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal device improving throughput of an entire network. <P>SOLUTION: An access point 10 performs wireless communication according to a WiFi wireless communication scheme through a communication band wider than that of WiMAX. A terminal device 2 that is an isolate terminal, receives a router advertisement transmitted from terminal devices 1, 3 existing within a communication range of the access point 10 when a terminal device having a wireless interface operated in an ad-hoc mode is detected. The terminal device 2 then selects the terminal device 1 having a higher transmission rate as a relay terminal based on transmission rates of the terminal devices 1, 3 included in the router advertisement. The terminal device 2 is then connected to the access point 10 via the terminal device 1 and performs communication via the access point 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a terminal device capable of repairing an isolated terminal and a communication network system including the terminal device.

  With the development of various wireless communication infrastructures such as WiFi and WiMAX, terminals equipped with a plurality of wireless interfaces are becoming popular. In such a terminal, it is common to switch a wireless communication infrastructure to be used in accordance with a use application and a wireless environment.

  As a technology for such terminals to use a better communication environment, wide area wireless services such as cellular networks, and relays with WiFi to improve the throughput by artificially expanding the coverage of WiFi access points A method for constructing a multi-hop route using a terminal has been proposed (Non-Patent Document 1).

  In the method proposed in Non-Patent Document 1, the relay terminal includes one third-generation interface and one WiFi interface. Then, the relay terminal is connected to the cellular network with a third generation interface, and the WiFi interface is used to provide a relay function to neighboring terminals. The relay terminal relays the packet between the third generation interface and the WiFi interface, thereby reducing the area that is a dead spot of the cellular network.

Hung-yu Wei, Richard D. Gitlin, WWAN / WLAN Two-Hop-Relay Architecture for Capacity Enhancement, WCNC04.

  However, in the method proposed in Non-Patent Document 1, since the isolated terminal is relieved with WiFi having a wider communication band than that of the cellular network, the throughput of the entire network reaches the peak in the band of the cellular network, and the wide communication band of WiFi is utilized. There is no problem.

  Therefore, the present invention has been made to solve such a problem, and an object thereof is to provide a terminal device capable of improving the throughput of the entire network.

  Another object of the present invention is to provide a communication network system including a terminal device capable of improving the throughput of the entire network.

  According to the present invention, the terminal device includes first and second wireless interfaces and connection means. The first wireless interface has a first communication range and a first communication band, and performs wireless communication according to the first wireless communication method. The second wireless interface has a second communication range that is narrower than the first communication range and a second communication band that is wider than the first communication band, and performs wireless communication according to the second wireless communication method. . The connection means connects the second wireless interface to the access point via the relay terminal when the second wireless interface cannot be directly connected to the access point that performs wireless communication according to the second wireless communication method.

  Preferably, the connection means has a wireless interface that operates in the ad hoc mode according to the second wireless communication system, based on a control frame transmitted from a terminal device that has a wireless interface that operates in the ad hoc mode according to the second wireless communication system. A terminal device having higher communication quality with the terminal device is selected as a relay terminal from the plurality of terminal devices, and the second wireless interface is connected to the access point via the selected relay terminal.

  Preferably, the connection unit detects a relay terminal having a wireless interface that operates in an ad hoc mode according to the second wireless communication method, based on a control frame transmitted from a terminal device that performs wireless communication according to the second wireless communication method. If not, a plurality of terminal devices existing in the vicinity of the terminal device are detected by receiving the packet in a mode in which a packet discarded without being received can be received, and the relay including the detected terminal devices is performed. A route connection request is transmitted to the route control device arranged on the network to which the access point is connected via the first wireless interface, includes a plurality of candidate terminals that are candidate terminals of the relay terminal, and A relay route connection response for permitting the connection is sent from the route control device to the first wireless interface. Is selected from a plurality of candidate terminals as a relay terminal based on the communication quality between the terminal device and the plurality of candidate terminals, and the selected relay terminal Connect the second wireless interface to the access point.

  Preferably, the plurality of candidate terminals include terminal devices selected from the plurality of terminal devices detected by the connection unit, or the plurality of terminal devices detected by the connection unit and the terminal device detected by the path control device And a terminal device selected from the above.

  According to the present invention, the terminal device includes first and second wireless interfaces and route construction means. The first wireless interface has a first communication range and a first communication band, and performs wireless communication according to the first wireless communication method. The second wireless interface has a second communication range narrower than the first communication range and a second communication band wider than the first communication band, and performs wireless communication according to the second wireless communication method. Wireless communication is performed in the infrastructure mode according to the second wireless communication method with the access point. When the route construction means receives a request for opening a wireless interface for performing wireless communication in accordance with the second wireless communication system from the route control device arranged on the network to which the access point is connected via the second wireless interface, The second wireless interface is opened as a relay wireless interface, and a route is established with the isolated terminal through the opened second wireless interface.

  Preferably, the route construction means reopens the second wireless interface to the access point in the infrastructure mode when the route construction request is not received from the isolated terminal after the second wireless interface is opened and a predetermined time has elapsed. Connecting.

  Furthermore, according to the present invention, the communication network system includes a base station, a plurality of access points, a plurality of terminal devices, a route control device, and an isolated terminal. The base station is connected to the network, has a first communication range and a first communication band, and performs wireless communication according to the first wireless communication method. The plurality of access points are connected to the network, have a second communication range that is narrower than the first communication range, and a second communication band that is wider than the first communication band, and second wireless communication Wireless communication is performed according to the method. The plurality of terminal devices perform wireless communication with the base station and the access point. The route control device communicates with a base station and a plurality of access points via a network. An isolated terminal is a terminal device that can directly access a base station and cannot directly connect to any of a plurality of access points. When the isolated terminal detects a terminal device having a wireless interface that operates in the ad hoc mode from among the plurality of terminal devices, the isolated terminal connects to the access point via the relay terminal selected from the terminal device and operates in the ad hoc mode. When a terminal device having a wireless interface cannot be detected, a plurality of peripheral terminal devices existing in its vicinity are detected, and a relay route connection request including the detected plurality of peripheral terminal devices is transmitted to the route control device via the base station. A plurality of candidate terminals that are candidate terminals of the relay terminal, and when a relay path connection response for permitting connection of the relay path is received from the path control device via the base station, the self and a plurality of candidates Select a candidate terminal with higher communication quality based on the communication quality with the terminal as a relay terminal and select it from multiple candidate terminals To connect to an access point via a relay terminal was. Further, the route control device selects a plurality of candidate terminals from a plurality of peripheral terminal devices in response to the relay route connection request, and performs wireless communication with the selected plurality of candidate terminals by the second wireless communication method. When a release response indicating that the wireless interface is released is received from a plurality of candidate terminals, a relay path connection response is transmitted to the isolated terminal via the base station. Further, each of the plurality of candidate terminals opens a wireless interface in response to the opening request, and establishes a route with an isolated terminal via the opened wireless interface.

  Preferably, the route control device refers to the topology of the plurality of terminal devices in response to the relay route connection request, selects a terminal device suitable for the relay terminal from the plurality of terminal devices, and the selected terminal device; A plurality of candidate terminals are selected from a plurality of peripheral terminal devices.

  According to the present invention, the terminal device connects the second wireless interface to the access point via the relay terminal when the terminal device cannot be directly connected to the access point by the second wireless interface that performs wireless communication in a wider communication band. As a result, the terminal device that has been an isolated terminal performs communication using a wider communication band.

  Therefore, the throughput of the entire communication network system can be improved.

  Further, according to the present invention, the terminal device opens the second wireless interface for performing wireless communication in a wider communication band in response to a release request from the path control device arranged on the network. A route is established with the isolated terminal via the second wireless interface. As a result, the terminal device that has been an isolated terminal performs communication using a wider communication band.

  Therefore, the throughput of the entire communication network system can be improved.

  Furthermore, according to the present invention, when the communication network system detects a terminal device having a wireless interface that operates in the ad hoc mode, the communication network system accesses the first access point via the relay terminal and operates in the ad hoc mode. When a terminal device having a terminal cannot be detected, a plurality of candidate terminals that are candidate terminals of the relay terminal are received from the route control device, a relay terminal is selected from the received plurality of candidate terminals, and the relay terminal is selected via the selected relay terminal. An isolated terminal that accesses one access point, and a route control device that selects a plurality of candidate terminals. As a result, the terminal device that has been an isolated terminal performs communication using a wider communication band.

  Therefore, the throughput of the entire communication network system can be improved.

It is the schematic which shows the structure of the communication network system by embodiment of this invention. It is a block diagram of the terminal device 1 shown in FIG. It is a block diagram of the access point shown in FIG. It is a block diagram of the home agent shown in FIG. It is a block diagram of the route control apparatus shown in FIG. It is a conceptual diagram for demonstrating the method for an isolated terminal to connect to an access point via a relay terminal. It is a figure which shows the procedure of a connection process. It is a conceptual diagram for demonstrating the other method in which an isolated terminal connects to an access point via a relay terminal. It is a figure which shows the other procedure of a connection process. It is a conceptual diagram when cut | disconnecting a relay path | route. It is a conceptual diagram in case two relay terminals relay. It is a transition diagram of the state which a terminal device can take.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram showing a configuration of a communication network system according to an embodiment of the present invention. Referring to FIG. 1, a communication network system 100 according to an embodiment of the present invention includes terminal devices 1 to 6, access points 10 and 20, a base station 30, a network 40, a home agent 50, and a monitoring server. 60 and a route control device 70.

  The terminal devices 1 to 6 are arranged in the wireless communication space. Each of the terminal devices 1 to 6 includes at least one wireless interface for wide area wireless service (for example, WiMAX) and two wireless interfaces for WiFi, and the access points 10 and 20 are provided by the wireless interfaces provided. And / or access base station 30.

  Each of the terminal devices 1 to 6 functions as an isolated terminal, a relay terminal, or a normal terminal, as will be described later.

  In the embodiment of the present invention, an isolated terminal refers to a terminal that can directly access a WiMAX base station, has no directly connectable access point, and can use the WiFi service only through a relay path.

  A relay terminal refers to a terminal that has a plurality of WiFi interfaces and provides a relay path to an isolated terminal in an ad hoc mode as a relay station using some of the interfaces.

  Furthermore, a normal terminal refers to a terminal that is directly linked to a plurality of access points through a plurality of WiFi interfaces and is not relaying.

  Each of the access points 10 and 20 is connected to the network 40. Each of the access points 10 and 20 performs wireless communication with the terminal devices 1 to 6 using the WiFi wireless communication method.

  Each of the access points 10 and 20 periodically creates a terminal list, which is a list of terminal devices that access itself, and transmits the created terminal list to the monitoring server 60 via the network 40.

  Further, each of the access points 10 and 20 periodically measures the traffic amount that is the amount of packets received from the terminal devices 1 to 6, and transmits the measured traffic amount to the monitoring server 60 via the network 40. .

  Further, each of the access points 10 and 20 communicates with the home agent 50 and the route control device 70 via the network 40.

  Further, each of the access points 10 and 20 periodically transmits a beacon frame by wireless communication.

  The base station 30 is connected to the network 40. The base station 30 performs wireless communication with the terminal devices 1 to 6 using, for example, a WiMAX wireless communication method.

  The base station 30 communicates with the home agent 50 and the route control device 70 via the network 40.

  The home agent 50 relays communication between any one of the terminal devices 1 to 6 and a communication partner terminal device existing in a network system other than the communication network system 100.

  Based on the terminal list received from the access points 10 and 20, the monitoring server 60 creates a topology indicating the connection state of the terminal devices 1 to 6 and the access points 10 and 20, and manages the created topology.

  Further, the monitoring server 60 grasps the load of the terminal devices 1 to 6 based on the traffic amount and topology received from the access points 10 and 20, and manages the grasped load.

  When any one of the terminal devices 1 to 6 is an isolated terminal and receives a relay route connection request from the isolated terminal via the base station 30, the route control device 70 connects the isolated terminal to the access point 10 by a method described later. , 20 is performed.

  WiMAX has a communication range REG1 and a communication band BW1. On the other hand, WiFi has a communication range REG2 that is narrower than the communication range REG1, and a communication band BW2 that is wider than the communication band BW1.

  Therefore, the communication network system 100 includes a network in which a plurality of wireless communication methods having different communication ranges and communication bands are mixed.

  FIG. 2 is a configuration diagram of the terminal device 1 shown in FIG. With reference to FIG. 2, the terminal device 1 includes antennas 11 to 13, wireless interfaces 14 to 16, a communication unit 17, and an application module 18.

  The antennas 11 to 13 are provided corresponding to the wireless interfaces 14 to 16, respectively.

  The wireless interface 14 performs wireless communication by a WiMAX wireless communication method. The wireless interface 14 accesses the base station 30 and transmits / receives packets to / from the base station 30.

  That is, the wireless interface 14 transmits the packet received from the communication unit 17 to the base station 30 via the antenna 11. Further, the wireless interface 14 receives a packet from the base station 30 via the antenna 11 and outputs the received packet to the communication unit 17.

  Each of the wireless interfaces 15 and 16 performs wireless communication by a WiFi wireless communication method. Each of the wireless interfaces 15 and 16 accesses the access points 10 and 20 in the infrastructure mode, and transmits and receives packets to and from the access points 10 and 20.

  That is, the wireless interfaces 15 and 16 transmit the packets received from the communication unit 17 to the access points 10 and 20 via the antennas 12 and 13, respectively. The wireless interfaces 15 and 16 receive packets from the access points 10 and 20 via the antennas 12 and 13, respectively, and output the received packets to the communication unit 17.

  Each of the wireless interfaces 15 and 16 also operates in the ad hoc mode, accesses the access points 10 and 20 via other terminal devices, and relays packets between the other terminal devices and the access points 10 and 20. .

  The communication unit 17 receives a packet from the application module 18 and transmits the received packet using any one of the wireless interfaces 14 to 16.

  The communication unit 17 receives packets from the wireless interfaces 14 to 16. Then, when the destination of the received packet is the terminal device 1, the communication unit 17 outputs the received packet to the application module 18. On the other hand, when the destination of the received packet is not the terminal device 1, the communication unit 17 relays using either the wireless interface 15 or 16.

  Furthermore, when the terminal device 1 is an isolated terminal, the communication unit 17 performs processing for connecting the terminal device 1 to the access points 10 and 20 in the ad hoc mode by a method described later.

  Furthermore, when the terminal device 1 is a relay terminal, the communication unit 17 performs processing for connecting another terminal device to the access points 10 and 20 in the ad hoc mode by a method described later.

  The application module 18 generates and outputs a packet to the communication unit 17 and receives the packet from the communication unit 17.

  Each of the terminal devices 2 to 6 shown in FIG. 1 has the same configuration as the terminal device 1 shown in FIG.

  FIG. 3 is a block diagram of the access point 10 shown in FIG. With reference to FIG. 3, the access point 10 includes an antenna 21, a wireless interface 22, a communication unit 23, and a wired interface 24.

  The wireless interface 22 performs wireless communication by a WiFi wireless communication method. The wireless interface 22 receives the packet from the communication unit 23 and transmits the received packet via the antenna 21. The wireless interface 22 receives a packet via the antenna 21 and outputs the received packet to the communication unit 23.

  The communication unit 23 receives a packet from the wireless interface 22 and outputs the received packet to the wired interface 24. The communication unit 23 receives a packet from the wired interface 24 and outputs the received packet to the wireless interface 22.

  The wired interface 24 receives a packet from the communication unit 23 and transmits the received packet to the home agent 50, the monitoring server 60, and the route control device 70 via the network 40.

  Further, the wired interface 24 receives packets from the home agent 50 and the route control device 70 via the network 40 and outputs the received packets to the communication means 23.

  The access point 20 shown in FIG. 1 has the same configuration as the access point 10 shown in FIG. 1 also has the same configuration as that of the access point 10 shown in FIG. However, the wireless interface 22 of the base station 30 performs wireless communication using a WiMAX wireless communication method.

  FIG. 4 is a configuration diagram of the home agent 50 shown in FIG. Referring to FIG. 4, home agent 50 includes a wired interface 51 and communication means 52.

  The wired interface 51 receives a packet via the network 40 and outputs the received packet to the communication unit 52.

  The wired interface 51 receives a packet from the communication unit 52 and transmits the received packet.

  When the communication unit 52 receives a packet from the wired interface 51 and the destination of the received packet is the terminal device 1 to 6, the communication unit 52 is based on the correspondence between the home address and the care-of address of the terminal device 1 to 6 managed by itself. Then, the destination of the received packet is encapsulated by the care-of address of the terminal devices 1 to 6 and output to the wired interface 51.

  Further, when the destination of the packet received from the wired interface 51 is a terminal device belonging to a network other than the communication network system 100, the communication unit 52 outputs the received packet to the wired interface 51 as it is.

  FIG. 5 is a block diagram of the path control device 70 shown in FIG. With reference to FIG. 5, the path control device 70 includes a wired interface 71, a communication means 72, and a control module 73.

  The wired interface 71 receives a packet via the network 40 and outputs the received packet to the communication unit 72.

  The wired interface 71 receives a packet from the communication unit 72 and transmits the received packet.

  The communication unit 72 receives a packet from the wired interface 71 and extracts a relay route connection request or a release response included in the received packet from the packet. Then, the communication unit 72 outputs the extracted relay path connection request or release response to the control module 73.

  Here, the relay path connection request is a request for selection of a relay terminal for an isolated terminal to connect to an access point in the ad hoc mode.

  The release response is a response indicating that the terminal device that has received the release request for opening the WiFi wireless interface from the path control device 70 responds to the release request.

  The communication unit 72 receives a relay path connection response from the control module 73 and generates a packet including the received relay path connection response. Then, the communication unit 72 outputs the generated packet to the wired interface 71.

  Further, the communication means 72 receives a wireless interface release request and a candidate terminal from the control module 73 and generates a packet including the received release request. Then, the communication unit 72 transmits the generated packet to the candidate terminal via the wired interface 71.

  Further, the communication unit 72 receives the relay path connection response from the control module 73 and generates a packet including the received relay path connection response. Then, the communication unit 72 outputs the generated packet to the wired interface 71.

  When the control module 73 receives the relay path connection request from the communication unit 72, the control module 73 refers to the monitoring server 60 via the communication unit 72 and the wired interface 71 and acquires the loads of the terminal devices 1 to 6.

  And the control module 73 selects the candidate terminal of the relay terminal which relays an isolated terminal based on the acquired load of the terminal devices 1 to 6 and the terminal list and communication quality included in the relay path connection request.

  Then, the control module 73 generates a wireless interface release request, and outputs the generated release request and the candidate terminal of the relay terminal to the communication unit 72.

  When receiving the release response from the communication unit 72, the control module 73 generates a relay route connection response that is a response to the relay route connection request, and outputs the generated relay route connection response to the communication unit 72.

  A communication operation in the communication network system 100 will be described. In communication network system 100 shown in FIG. 1, terminal devices 1 to 6 communicate with terminal devices (not shown) included in a communication network system (not shown) other than communication network system 100.

  A terminal device included in a communication network system other than the communication network system 100 is referred to as a communication partner node, and is represented as CN (Correspondent Node).

  Each of the terminal devices 1 to 6 has a single home address (HoA: Home Address) and a care-of address (CoA: Care-of Address). The home address HoA and the care-of address CoA are associated with each other.

  The home agent 50 manages the home address HoA and the care-of address CoA in each of the terminal devices 1 to 6 included in the communication network system 100 in association with each other.

  When the terminal device 1 communicates with the terminal device CN, the terminal device 1 sets [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN)] to [SRC (= terminal device CN). CoS) / DST (= address of home agent 50)] and encapsulated by [SRC (= HoA of terminal device 1) / DST (= address of terminal device CN) [SRC (= HoA of terminal device 1) / DST ( = Address of terminal device CN)]]. The terminal device 1 then [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN) [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN)]]. Packet PKT = [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN) [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN)]], The generated packet PKT is transmitted to the home agent 50 via the network 40.

  The communication means 52 of the home agent 50 uses the packet PKT = [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN) [SRC (= HoA of the terminal device 1) / DST (= of the terminal device CN). Address]]] and the received packet PKT = [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN) [SRC (= HoA of the terminal device 1) / DST (= terminal device) CN of address)]] SRC (= HoA of terminal device 1) / DST (= address of terminal device CN) [SRC (= HoA of terminal device 1) / DST (= address of terminal device CN)] Packet PKT = [SRC (= HoA of terminal device 1) / DST (= address of terminal device CN)]. Then, the communication means 52 of the home agent 50 transmits the packet PKT = [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN)] to the terminal device CN.

  Then, the terminal device CN receives the packet PKT = [SRC (= HoA of the terminal device 1) / DST (= address of the terminal device CN)].

  When the terminal device CN transmits a packet to the terminal device 1, the packet is transmitted from the terminal device CN to the terminal device 1 via the home agent 50 by the method described above.

  Thus, in communication between the terminal device 1 and the terminal device CN, the care-of address of the terminal device 1 is used for communication between the home agent 50 and the terminal device 1.

  In addition, when the terminal devices 2 to 6 communicate with the terminal device CN, communication is performed by the method described above.

  Next, a method in which an isolated terminal connects to access points 10 and 20 via a relay terminal will be described.

  FIG. 6 is a conceptual diagram for explaining a method in which an isolated terminal connects to access points 10 and 20 through a relay terminal. FIG. 7 is a diagram illustrating a procedure of connection processing.

  A method in which the isolated terminal connects to the access point 10 via the relay terminal using the terminal apparatus 1 as the relay terminal 1 and the terminal apparatus 2 as the isolated terminal will be described.

  When the terminal device 2 cannot directly connect to the access points 10 and 20, the wireless interfaces 15 and 16 of the terminal device 2 scan all frequency channels, and the beacon frame Bcon1 in ad hoc mode that the relay terminal 1 periodically transmits. And the received beacon frame Bcon1 is output to the communication means 17. And the communication means 17 of the terminal device 2 searches for a relay terminal based on the beacon frame Bcon1.

  When the relay terminal 1 operates one of the wireless interfaces in the ad hoc mode, the beacon frame includes the ESSID including the keyword ADM indicating that it operates as the relay terminal in the embodiment of the present invention in the beacon frame Bcon1 in the ad hoc mode. Bcon1 is transmitted periodically.

  Similarly, the terminal device 3 periodically transmits a beacon frame Bcon2.

  Therefore, the communication means 17 of the terminal device 2 can search for the relay terminal in the embodiment of the present invention by confirming whether the ESSID included in the beacon frames Bcon1 and Bcon2 includes the keyword ADM.

[When a relay terminal can be found]
It is assumed that the communication unit 17 of the terminal device 2 can search the terminal devices 1 and 3 as terminal devices having a wireless interface that operates in the ad hoc mode.

  The wireless interface 15 of the terminal device 2 detects the received signal strengths RSSI 1 and RSSI 2 when the beacon frames Bon 1 and Bcon 2 are received, and outputs the detected received signal strengths RSSI 1 and RSSI 2 to the communication unit 17.

  The communication means 17 of the terminal device 2 receives the received signal strengths RSSI1 and RSSI2. Then, the communication means 17 of the terminal device 2 is connected to a relay terminal cell (cell is a terminal of a connection destination of the terminal device 2 from a terminal device having a wireless interface operating in the ad hoc mode based on the received signal strengths RSSI1 and RSSI2. Terminal devices 1 and 3 are selected as appropriate. That is, the communication unit 17 of the terminal device 2 selects, as a relay terminal cell, the terminal devices 1 and 3 having the larger received signal strength RSSI among the terminal devices having a wireless interface that operates in the ad hoc mode.

  Thereafter, the communication unit 17 of the terminal device 2 receives the router advertisements RAD_1 and RAD_3 transmitted by the terminal devices 1 and 3.

The router advertisement RAD_1 includes the transmission rate r _tx 1 of the terminal device 1, the address prefix ADPF1, and the expiration date VLD1. The router advertisement RAD_3 includes the transmission rate r _tx 3 of the terminal device 1, the address prefix ADPF3, and the expiration date VLD3. Each of the expiration dates VLD1 and VLD3 is set to 10 seconds to 30 seconds, for example. That is, each of the expiration dates VLD1 and VLD3 is set to a value (several times or more) longer than the router advertisement transmission interval.

The communication unit 17 of the terminal device 2 selects the terminal device 1 having a higher transmission rate as a relay terminal based on the transmission rates r _tx 1 and r _tx 3 included in the router advertisements RAD_1 and RAD_3.

  Further, the communication unit 17 of the terminal device 2 generates the care-of address CoA2 based on the address prefix ADPF1 of the router advertisement RAD_1 and the MAC (Media Access Control) address of the terminal device 2.

  Then, the communication unit 17 of the terminal device 2 generates a route construction request including the home address HoA2 and the care-of address CoA2 of the terminal device 2, and transmits the generated route construction request to the access point 10 through the wireless interface 15.

  The wireless interface 16 of the terminal device 1 receives the route construction request from the terminal device 2 and outputs the received route construction request to the communication unit 17. Then, the communication unit 17 of the terminal device 1 detects that the destination of the route construction request is the access point 10 and transmits the route construction request to the access point 10 through the wireless interface 15.

  As described above, when the terminal device 2 that is an isolated terminal selects the relay terminal (= terminal device 1), it transmits a route construction request to the access point 10 via the selected relay terminal (= terminal device 1). (See Procedure 1 in FIG. 7).

  The communication unit 23 of the access point 10 receives the route construction request via the wireless interface 22.

  Thereafter, the communication means 23 of the access point 10 generates a route construction response that is a response to the route construction request, and transmits the generated route construction response to the terminal device 2 via the terminal device 1 (procedure of FIG. 7). 2). And the communication means 17 of the terminal device 2 receives a route construction response. As a result, a multi-hop route from the terminal device 2 to the access point 10 via the terminal device 1 is established.

  After the path is established, the terminal device 2 transmits a Mobile IPv6 Binding Update message to the home agent 50 in order to notify the home agent 50 of the association between the home address HoA2 and the care-of address CoA2.

  The home agent 50 receives the Binding Update message from the terminal device 2, and manages the home address HoA2 and the care-of address CoA2 in association with each other.

  Thereafter, the home agent 50 transmits a Binding Acknowledge message, which is a response to the Binding Update message, to the terminal device 2. And the terminal device 2 receives a Binding Acknowledge message.

  When the terminal device 2 performs wireless communication with the access point 10, the terminal device 1 relays packets between the access point 10 and the terminal device 2 through the wireless interfaces 15 and 16, while in the infrastructure mode through the wireless interface 15. Wireless communication with the access point 10 is performed.

  In this case, the wireless interface 16 of the terminal device 1 performs wireless communication with the access point 10 using the channel CH1, and the wireless interface 15 of the terminal device 1 performs wireless communication with the terminal device 2 through the channel CH2. To do.

[If you cannot find a relay terminal]
FIG. 8 is a conceptual diagram for explaining another method for connecting an isolated terminal to access points 10 and 20 via a relay terminal. FIG. 9 is a diagram illustrating another procedure of the connection process.

  If the communication means 17 of the terminal device 2 cannot search for a relay terminal having a wireless interface that operates in the ad hoc mode, the terminal device located in the vicinity of the terminal device 2 promiscuously transmits a packet transmitted by the WiFi wireless interfaces 15 and 16. By receiving in the mode, the terminal devices 1, 3, and 5 located around the terminal device 2 are detected.

  Note that this promiscuous mode is a mode in which a packet that is normally discarded without being received can be received.

  When each of the wireless interfaces 15 and 16 of the terminal device 2 receives a packet in the promiscuous mode, it detects the received signal strength RSSI1, RSSI3, RSSI5 when the packet is received, and detects the received signal strength RSSI1, RSSI3 and RSSI5 are output to the communication means 17.

  Further, the communication means 17 of the terminal device 2 acquires the addresses Addr1, Addr3, Addr5 of the detected peripheral terminal devices 1, 3, 5 by detecting the address of the transmission source from the received packet.

  Thereafter, the communication means 17 of the terminal device 2 includes the terminal list MNL = [Addr1: RSSI1] including the addresses Addr1, Addr3, Addr5 of the peripheral terminal devices and the received signal strengths RSSI1, RSSI3, RSSI5 corresponding to the peripheral terminal devices. / Addr3: RSSI3 / Addr5: RSSI5], and generates a relay route connection request RRE = [MNL] including the generated terminal list MNL.

  Then, the communication unit 17 of the terminal device 2 generates a packet PKT1 = [SRC = Addr2 / DST = Addr70 / RRE] including the generated relay path connection request RRE = [MNL], and the generated packet PKT1 = SRC = Addr2 / DST = Addr70 / RRE] is transmitted to the route control device 70 via the wireless interface 14. That is, the terminal device 2 transmits a relay route connection request RRE = [MNL] to the route control device 70 using the WiMAX communication network (see arrow ARW1 in FIG. 8 and procedure 3 in FIG. 9).

  The communication unit 72 of the path control device 70 receives the packet PKT1 = SRC = Addr2 / DST = Addr70 / RRE] via the wired interface 71, and receives the received packet PKT1 = SRC = Addr2 / Addr70 / RRE]. Output to the communication means 72.

  Then, the communication means 72 of the route control device 70 detects that the packet PKT1 is addressed to the route control device 70 based on DST = Addr70 of the packet PKT1 = SRC = Addr2 / DST = Addr70 / RRE].

  Then, the communication means 72 of the route control device 70 extracts the transmission source SRC = Addr2 and the relay route connection request RRE = [MNL] from the packet PKT1, and extracts the transmission source SRC = Addr2 and the relay route connection request RRE = [MNL]. ] To the control module 73.

  When receiving the transmission source SRC = Addr2 and the relay route connection request RRE = [MNL] from the communication unit 72, the control module 73 of the route control device 70 receives the terminal list MNL = [Addr1: from the relay route connection request RRE = [MNL]. RSSI1 / Addr3: RSSI3 / Addr5: RSSI5] is extracted, and it is detected that the terminal devices existing around the terminal device 2 are the terminal devices 1, 3, and 5.

  Then, the control module 73 of the route control device 70 acquires the traffic amounts Trf1, Trf3, Trf5 of the terminal devices 1, 3, 5 from the monitoring server 60 via the communication means 72 and the wired interface 71.

  Here, the traffic amount Trf1 includes a traffic amount Trf11 in the wireless interface 15 of the terminal device 1 and a traffic amount Trf12 in the wireless interface 16 of the terminal device 1, and the traffic amounts Trf11 and Trf12 are wireless interfaces 15 and 16, respectively. Are associated with MAC addresses MACadd15 and MACadd16. The same applies to the traffic amounts Trf3 and Trf5.

  Thereafter, the control module 73 of the route control device 70 is configured to provide a plurality of terminals that can provide good communication quality based on the received signal strengths RSSI1, RSSI3, RSSI5 and the traffic volumes Trf1, Trf3, Trf5 of the terminal devices 1, 3, 5. The apparatuses 1 and 3 are selected as relay terminal candidate terminals. That is, the control module 73 of the path control device 70 selects the terminal devices 1 and 3 whose received signal strength is equal to or higher than the reference value and whose traffic volume is equal to or lower than the reference value as candidate terminals of the relay terminal.

  Then, the control module 73 of the path control device 70 generates the release requests DEMO1 and DEMO3 requesting the release of the WiFi wireless interface, and the generated release requests DEMO1 and DEMO3 are respectively transmitted via the access point 10 to the terminal device 1, 3 (see arrow ARW2 in FIG. 8 and procedures 4 and 6 in FIG. 9).

  In this case, the release request DEMO1 includes information specifying the radio interface 16 that the terminal device 1 should open, and the release request DEMO2 includes information specifying the radio interface 15 that the terminal device 3 should open.

  As described above, since the traffic amounts Trf11, Trf12; Trf31, Trf32; Trf51, Trf52 are associated with the wireless interfaces 15 and 16 of the terminal devices 1, 3, and 5, the control module 73 includes a plurality of terminal devices. When selecting 1, 3, it is possible to select a plurality of terminal devices 1, 3 by designating the wireless interface (any one of the wireless interfaces 15, 16) of the terminal devices 1, 3.

  Therefore, the control module 73 can generate the release requests DEMO1 and DEMO3 including information specifying the radio interface to be opened.

  The communication unit 17 of the terminal device 1 receives the release request DEMO1 via the wireless interface 16, and generates an opening response REPO1 indicating that the opening of the wireless interface 16 has been accepted in response to the received release request DEMO1. The generated release response REPO1 is transmitted to the route control device 70 via the access point 10 (see arrow ARW3 in FIG. 8 and procedure 5 in FIG. 9). Thereafter, the wireless interface 16 of the terminal device 1 is disconnected from the access point 10 and opened for relaying in the ad hoc mode.

  Further, the communication means 17 of the terminal device 3 receives the release request DEMO3 via the wireless interface 15, and generates an release response REPO3 indicating that the release of the wireless interface 15 has been accepted according to the received release request DEMO3. Then, the generated release response REPO3 is transmitted to the route control device 70 via the access point 10 (see arrow ARW4 in FIG. 8 and procedure 7 in FIG. 9). Thereafter, the wireless interface 15 of the terminal device 3 is disconnected from the access point 10 and opened for relaying in the ad hoc mode.

  When the control module 73 of the route control device 70 receives the release responses REPO1 and REPO3 from all of the selected terminal devices 1 and 3, the relay route connection response RRP including the addresses of the terminal devices 1 and 3 that are candidate terminals of the relay terminal. = [MACadd1 / MACadd3] is generated, and the generated relay path connection response RRP = [MACadd1 / MACadd3] is transmitted to the terminal device 2 via the base station 30 (arrow ARW5 in FIG. 8 and procedure 8 in FIG. 9). reference).

  The communication unit 17 of the terminal device 2 receives the relay route connection response RRP = [MACadd1 / MACadd3] via the wireless interface 14. Then, the communication unit 17 of the terminal device 2 detects that the terminal devices 1 and 3 are candidate terminals of the relay terminal with reference to MACadd1 / MACadd3 of the relay route connection response RRP = [MACadd1 / MACadd3].

  Thereafter, the wireless interface 15 of the terminal device 2 receives the router advertisements RAD_1 and RAD_3 transmitted by the terminal devices 1 and 3 in the access point 10.

  Thereafter, the terminal device 2 connects to the access point 10 by a multi-hop route via the terminal device 1 by the same method as the method of “when a relay terminal can be searched” described above.

  When the terminal device 2 performs wireless communication with the access point 10, the terminal device 1 relays a packet between the access point 10 and the terminal device 2 through the wireless interfaces 15 and 16.

  In this case, the wireless interface 15 of the terminal device 1 performs wireless communication with the access point 10 using the channel CH1, and the wireless interface 16 of the terminal device 1 performs wireless communication with the terminal device 2 through the channel CH2. To do.

  On the other hand, after the wireless interface 15 of the terminal device 3 is opened for relay in the ad hoc mode, the terminal device 2 (= isolated terminal) does not connect even after waiting for a certain time (= 10 seconds, for example). Return to the infrastructure mode and reconnect to the access point 10.

  In FIG. 9, the case where the terminal devices 1 and 3 are relay terminal candidate terminals has been described, but in general, the relay terminal candidate terminals include n (n is an integer of 2 or more) terminal devices. Become. In this case, a relay interface release request and a relay interface release response are transmitted and received between each of the n terminal devices and the route control device 70.

  When the link to the access point 10 side is disconnected due to the movement of the terminal device 1 or the operation of the user of the terminal device 1, the terminal device 1 that is a relay terminal performs the following processing and provides it to the lower-level terminal device 2. The relay function is stopped by disconnecting the relay route that was on.

  In the above description, it has been described that the control module 73 of the route control device 70 selects a candidate terminal of a relay terminal from the peripheral terminal devices 1, 3, and 5 detected by the terminal device 2 (= isolated terminal). In the embodiment of the present invention, the control module 73 of the route control device 70 is not limited to this, and refers to the topology (obtained from the monitoring server 60) of the terminal devices 1 to 6 in the communication network system 100. , Selecting a terminal device suitable for relay of the terminal device 2 (= isolated terminal), and the selected terminal device and the peripheral terminal devices 1, 3, 5 detected by the terminal device 2 (= isolated terminal), You may make it select the candidate terminal of a relay terminal.

  FIG. 10 is a conceptual diagram when the relay route is disconnected. The communication unit 17 of the terminal device 1 detects that the link on the access point 10 side has been disconnected by confirming that the downlink packet cannot be received from the access point 10.

  Then, the communication means 17 of the terminal device 1 generates a router advertisement RAD_1 = [expiration date = 0] with the expiration date set to “0”, and transmits the generated router advertisement RAD_1 to the terminal device 2.

  The communication unit 17 of the terminal device 2 receives the router advertisement RAD_1 = [expiration date = 0] and refers to the expiration date = 0 of the received router advertisement RAD_1 = [expiration date = 0]. It detects that the link between the access points 10 has been disconnected.

  Then, the communication unit 17 of the terminal device 2 starts searching for an access point. When the access point cannot be found, the terminal device 2 connects to the access point in the ad hoc mode according to the method “when the relay terminal can be searched” or the method “when the relay terminal cannot be searched” described above.

  FIG. 11 is a conceptual diagram when two relay terminals relay. Referring to FIG. 11, terminal device 1 relays wireless communication between access point 10 and terminal device 3, and terminal device 3 is connected between terminal device 1 and terminal device 2 (= isolated terminal). Relay wireless communication.

  The mode of relay shown in FIG. 11 is that the terminal device 3 is connected to the access point 10 via the terminal device 1 by the method described above as an isolated terminal, and then the terminal device 2 (= isolated terminal) is connected by the method described above. This is realized by connecting to the access point 10 via the terminal device 3.

  In the multi-hop wireless communication shown in FIG. 11, the terminal device 1 performs wireless communication with the access point 10 using the channel CH1, and performs wireless communication with the terminal device 3 using the channel CH2. . Further, the terminal device 3 performs wireless communication with the terminal device 1 using the channel CH2, and performs wireless communication with the terminal device 2 (= isolated terminal) using the channel CH2.

  As described above, in the embodiment of the present invention, the terminal device 1 directly connected to the access point 10 uses the channel CH2 different from the channel CH1 used for wireless communication with the access point 10 as a lower-level terminal device 3. Wireless communication with This is to improve throughput.

  Note that each of the terminal devices 1 and 3 not only relays wireless communication, but also may transmit and receive packets generated by itself with the access point 10 while relaying wireless communication.

  In the embodiment of the present invention, the number of relay terminals is not limited to two and may be three or more.

  FIG. 12 is a transition diagram of states that the terminal devices 1 to 6 can take. FIG. 12 is a state transition diagram in a case where each of the terminal devices 1 to 6 includes two WiFi wireless interfaces 15 and 16.

  When one wireless interface 15 is directly connected to the access point AP and the access point AP is found from the state ST1 in which the other wireless interface 16 is searching for the access point AP, the two wireless interfaces 15 and 16 are connected to the access point AP. Transition is made to the state ST2 directly connected to the AP.

  When the link between one wireless interface and the access point AP is disconnected in the state ST2, the state transitions to the state ST1.

  Further, when relay is requested in the state ST2, the state transits to the state ST3 in which the other wireless interface 16 is opened for relay while the one wireless interface 14 is directly connected to the access point AP.

  Then, in the state ST3, when the isolated terminal is not connected, when the access point AP is found, the relay function is stopped and the state transitions to the state ST2.

  Further, when the discovery of the access point AP fails in the state ST1, or when the relay is requested, the state transitions to the state ST3.

  Furthermore, when the connection to the access point AP is disconnected and the relay is disconnected in the state ST3, the state is not connected to the access point AP, and the state transitions to the state ST4 for searching for the access point AP.

  And when access point AP is discovered in state ST4, it changes to state ST1.

  Further, when the connection with the access point AP is disconnected in the state ST1, the state transitions to the state ST4.

  Furthermore, when the discovery of the access point AP fails in the state ST4, the state is not connected to the access point AP, and the state transitions to the state ST5 where the relay terminal is searched.

  Then, when a relay terminal is generated in the state ST5, one wireless interface is connected to the access point AP by relay, and the state transitions to the state ST6 in which the access point AP is searched.

  When the relay is disconnected in state ST6, the state transitions to state ST4. Further, when the access point AP is found in the state ST6 and the relay is disconnected, the state transitions to the state ST1.

  In addition, in the state ST5, when the relay terminal discovery fails, the state transitions to the state ST7 for searching for neighboring terminals.

  If relay is requested in state ST7, the state transitions to state ST5.

  Note that states ST5 and ST7 are isolated terminals.

  In FIG. 12, the state transition in the case where each of the terminal devices 1 to 6 includes two WiFi wireless interfaces has been described, but the case where each of the terminal devices 1 to 6 includes three or more WiFi wireless interfaces. There are more states than states ST1 to ST7 shown in FIG. 12, and the state transition in that case can be considered in the same manner as the state transition shown in FIG.

  As described above, according to the embodiment of the present invention, each of terminal devices 1 to 6 operates as one of an isolated terminal, a relay terminal, and a normal terminal. When each of the terminal devices 1 to 6 is an isolated terminal, it connects to the access point 10 or the access point 20 using the WiFi ad hoc mode, and performs wireless communication with the access point 10 or the access point 20 using the WiFi wireless communication method. Do.

  As a result, the isolated terminal performs wireless communication with the access point 10 or the access point 20 by a WiFi wireless communication scheme in which the communication band is wider than WiMAX.

  Therefore, according to the present invention, the throughput of the communication network system 100 can be improved.

  In the above description, the communication network system 100 has been described as adopting WiMAX and WiFi as a plurality of wireless communication schemes having different communication ranges and communication bands. However, in the embodiment of the present invention, the communication network system 100 is not limited thereto. 100 represents a first wireless communication system having a communication range REG1 and a communication band BW1, and a second wireless communication system having a communication range REG2 narrower than the communication range REG1 and a communication band BW2 wider than the communication band BW1. What is necessary is just to employ | adopt and connect an isolated terminal to the access point which performs wireless communication by a 2nd wireless communication system.

  When a terminal device that performs wireless communication by a wireless communication method having a wider communication band becomes an isolated terminal, the isolated terminal is connected to an access point in an ad hoc mode, thereby improving the throughput of the communication network system 100 as a whole. Because it can.

  In the above description, the terminal device 2 (= isolated terminal) selects the relay terminal based on the transmission rates of the terminal devices 1 and 3 included in the router advertisements RAD_1 and RAD_3 transmitted from the terminal devices 1 and 3. However, in the embodiment of the present invention, the terminal device 2 (= isolated terminal) is not limited to this, and the received signal strength when the router advertisements RAD_1 and RAD_3 transmitted from the terminal devices 1 and 3 are received. Based on the communication quality between the terminal device 2 and the terminal devices 1 and 3, generally, the terminal device having the larger received signal strength may be selected as the relay terminal. What is necessary is just to select a high terminal device as a relay terminal.

  Furthermore, in the above description, the route control device 70 performs good communication based on the received signal strengths RSSI1, RSSI3, RSSI5 of the terminal devices 1, 3, 5 and the traffic amounts Trf1, Trf3, Trf5 of the terminal devices 1, 3, 5. Although it has been described that the terminal devices 1 and 3 that can provide quality are selected from the terminal devices 1, 3, and 5 as candidate terminals of the relay terminal, in the embodiment of the present invention, the route control device 70 is not limited thereto, With reference to the topology of terminal devices 1, 2, 3, and 5 (obtained from monitoring server 60), terminal device 1 connected to an access point with a small number of terminals to be accessed is a candidate terminal for relay terminal 1 , 3, and 5, and in general, the relay terminal candidate terminal may be selected from the terminal devices 1, 3, and 5 by any method.

  In the embodiment of the present invention, the communication means 17 of the terminal device 2 that connects the wireless interface 15 to the access point 10 via the terminal device 1 (= relay terminal) by the method described above is referred to as “connection means”. Constitute.

  Further, in the embodiment of the present invention, in the above-mentioned case “when a relay terminal cannot be searched”, a route construction response is sent to the terminal device 2 (= isolated) in response to a route construction request from the terminal device 2 (= isolated terminal). The communication means 17 of the terminal device 1 that transmits to the terminal) and constructs a route with the terminal device 2 (= isolated terminal) constitutes a “route construction means”.

  Furthermore, in the embodiment of the present invention, each of beacon frames Bcon1 and Bcon2 constitutes a “control frame”.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  The present invention is applied to a terminal device capable of improving the throughput of the entire network. The present invention is also applied to a communication network system including a terminal device that can improve the throughput of the entire network.

  1 to 6 terminal device, 10, 20 access point, 11 to 13, 21 antenna, 14 to 16, 22 wireless interface, 17, 23, 52, 72 communication means, 18 application module, 24, 51, 71 wired interface, 30 Base station, 40 network, 50 home agent, 60 monitoring server, 70 path control device, 73 control module, 100 communication network system,

Claims (8)

A first wireless interface having a first communication range and a first communication band and performing wireless communication according to a first wireless communication method;
A second wireless interface having a second communication range narrower than the first communication range and a second communication band wider than the first communication band, and performing wireless communication according to a second wireless communication method When,
Connection means for connecting the second wireless interface to the access point via a relay terminal when the second wireless interface cannot be directly connected to an access point that performs wireless communication according to the second wireless communication method; Terminal device.   The connection means includes a wireless interface that operates in an ad hoc mode according to the second wireless communication system, based on a control frame transmitted from a terminal device that has a wireless interface that operates in the ad hoc mode according to the second wireless communication system. A terminal device having a higher communication quality with the terminal device is selected as a relay terminal from the plurality of terminal devices, and the second wireless interface is connected to the access point via the selected relay terminal. Item 2. The terminal device according to Item 1.   The connection means detects a relay terminal having a wireless interface that operates in an ad hoc mode according to the second wireless communication method, based on a control frame transmitted from a terminal device that performs wireless communication according to the second wireless communication method. If not, a plurality of terminal devices existing in the vicinity of the terminal device are detected by receiving the packet in a mode in which a packet discarded without being received can be received, and the relay including the detected terminal devices is performed. A route connection request is transmitted to the route control device arranged on the network to which the access point is connected via the first wireless interface, includes a plurality of candidate terminals that are candidate terminals of the relay terminal, and relays A relay route connection response for permitting route connection is sent from the route control device to the first non-transmission device. When receiving via the interface, a candidate terminal having a higher communication quality is selected from the plurality of candidate terminals as a relay terminal based on the communication quality between the terminal device and the plurality of candidate terminals, and the selected relay terminal The terminal device according to claim 1, wherein the second wireless interface is connected to the access point via a network.   The plurality of candidate terminals are terminal devices selected from a plurality of terminal devices detected by the connection means, or a plurality of terminal devices detected by the connection means and a terminal detected by the path control device The terminal device according to claim 3, comprising a terminal device selected from among the devices. A first wireless interface having a first communication range and a first communication band and performing wireless communication according to a first wireless communication method;
An access point having a second communication range narrower than the first communication range and a second communication band wider than the first communication band, and performing wireless communication according to a second wireless communication method; and A second wireless interface for performing wireless communication in an infrastructure mode according to the wireless communication method of 2;
When a request for opening a wireless interface for performing wireless communication according to the second wireless communication method is received from the routing device arranged on the network to which the access point is connected via the second wireless interface, the second wireless interface And a route construction means for constructing a route with an isolated terminal via the opened second wireless interface.   When the route construction means does not receive a route construction request from the isolated terminal even after a predetermined time has elapsed after opening the second wireless interface, the route construction means sets the second wireless interface in the infrastructure mode as the access point. The terminal device according to claim 5, wherein the terminal device is reconnected to the terminal device. A base station connected to a network, having a first communication range and a first communication band, and performing wireless communication according to a first wireless communication system;
Connected to the network, having a second communication range narrower than the first communication range and a second communication band wider than the first communication band, and wirelessly according to a second wireless communication scheme With multiple access points that communicate,
A plurality of terminal devices that perform wireless communication with the base station and the access point;
A path control device for communicating with the base station and the plurality of access points via the network;
An isolated terminal that is a terminal device that can directly access the base station and cannot directly connect to any of the plurality of access points;
When the isolated terminal detects a terminal device having a wireless interface that operates in an ad hoc mode among the plurality of terminal devices, the isolated terminal connects to the access point via a relay terminal selected from the terminal device, and the ad hoc mode When a terminal device having a wireless interface operating in the network cannot be detected, a plurality of peripheral terminal devices existing in its vicinity are detected, and a relay path connection request including the detected plurality of peripheral terminal devices is transmitted via the base station. Transmitting to the route control device, including a plurality of candidate terminals that are candidate terminals of the relay terminal, and receiving a relay route connection response for permitting connection of the relay route from the route control device via the base station Then, based on the communication quality between itself and the plurality of candidate terminals, a candidate terminal having a higher communication quality as a relay terminal Selected from a plurality of candidate terminals, connected to the access point via the selected relay terminal,
The route control device selects the plurality of candidate terminals from the plurality of peripheral terminal devices in response to the relay route connection request, and performs wireless communication with the selected plurality of candidate terminals by the second wireless communication method. Transmitting a wireless interface release request to be performed, and receiving an open response indicating that the wireless interface has been released from the plurality of candidate terminals, transmitting the relay path connection response to the isolated terminal via the base station,
Each of the plurality of candidate terminals opens the wireless interface in response to the opening request, and establishes a route with the isolated terminal via the opened wireless interface.   The route control device refers to the topology of the plurality of terminal devices in response to the relay route connection request, selects a terminal device suitable for the relay terminal from the plurality of terminal devices, and the selected terminal device The communication network system according to claim 7, wherein the plurality of candidate terminals are selected from the plurality of peripheral terminal devices.

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