JP6574875B2 - Node device for wireless ring network system - Google Patents

Description

  The present invention relates to a wireless ring network system in which a wireless ring network is configured by a plurality of node devices.

  When operating a wireless ring network system in which a wireless ring network is composed of a plurality of node devices inside a vehicle, some sections cause communication failures due to vehicle occupants or baggage carried by passengers. there is a possibility.

  Therefore, the node device in the section where the communication failure has occurred reverses the communication route, and the data is transmitted in the opposite direction in the other sections where the communication failure has not occurred, thereby bypassing the section where the communication failure has occurred. Then, it has been proposed to transmit data to a counterpart node device (for example, Patent Document 1).

JP 2000-101620 A

  However, in the above-described proposal, when a communication failure occurs in a part of the section, the network topology changes from the ring type to the line type, so that the time required from the start to the end of communication becomes long. For this reason, the timing at which the load of the vehicle connected to each node device operates in response to a control signal transmitted over the network is also delayed.

  In the above-described proposal, when a communication failure occurs in a plurality of sections, it is no longer possible to maintain a network configuration including all node devices even if the network topology is changed from a ring type to a line type.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a node device for a wireless ring network system that can maintain a ring network configuration even if communication failures occur in a plurality of sections. It is in.

In order to achieve the above object, a node device for a wireless ring network system according to the present invention described in claim 1 comprises:
In a node device for a wireless ring network system in which a wireless ring network is configured by a plurality of node devices,
A state confirmation request transmitting unit that is triggered by establishment of a predetermined trigger condition and broadcasts an inter-node communication state confirmation request;
An inter-node that receives the inter-node communication status confirmation request and includes identification information of each node device that is a source and a destination of the received inter-node communication status confirmation request and reception status information of the inter-node communication status confirmation request A communication status transmission means for broadcasting a communication status notification;
A radio ring network by the plurality of node devices based on the reception status information of the inter-node communication status notification received between the node devices constituting the radio ring network and receiving the inter-node communication status notification Optimization means for optimizing the communication route of
Storage means for storing the latest communication route optimized by the optimization means;
Data transmission / reception means for performing data transmission / reception with other node devices via the communication route stored in the storage means;
It is characterized by providing.

  According to the node device for a wireless ring network system of the present invention described in claim 1, when a predetermined trigger condition is satisfied, an inter-node communication state confirmation request is sent to another node device by the state confirmation request transmitting means. Broadcast transmission.

  Then, when the inter-node communication status confirmation request is received from another node device, the identification information of each node device that is the source and destination of the received inter-node communication status confirmation request is sent to the other node device by the communication status transmission means. And an inter-node communication status notification including the communication status confirmation request reception status information.

  Further, when the inter-node communication status notification from another node device is received, wireless communication by a plurality of node devices is performed based on the reception status information of the inter-node communication status notification received between the respective node devices constituting the wireless ring network. The communication route of the ring network is optimized by the optimization means.

  Therefore, if a communication failure occurs between certain node devices, both node devices cannot receive the inter-node communication status confirmation request from the other party and either do not transmit the corresponding inter-node communication status notification or receive from the other party. The inter-node communication status confirmation request is broadcasted to other node devices including the inter-node communication status notification including the reception status information indicating that the reception strength is insufficient.

  Therefore, the optimization unit recognizes the section in which the communication failure has occurred between the node devices from the reception state information of the inter-node communication state notification, and based on this, the wireless communication is performed so that the section in which the communication failure has occurred is not used. The communication route of the ring network is optimized.

  The data transmission / reception means always performs data transmission / reception with other node devices on the wireless ring network using the latest communication route stored in the storage means and optimized by the optimization means. Is called.

  Here, the reception state information of the inter-node communication state notification can be regarded as indicating the state of communication performed between the transmission source node device and the reception destination node device in both directions. Therefore, each node device indicates the communication state between each node device constituting the wireless ring network for all sections of the full-connect network based on the reception state information of the inter-node communication state notification received from each other node device. To grasp. For this reason, the communication route optimized by the optimization means of each node device is the same route.

  Therefore, a ring network configuration can be maintained even if communication failures occur in a plurality of sections.

The wireless ring network system of the first reference example is
In a wireless ring network system in which a wireless ring network is configured by a plurality of node devices,
Each of the node devices
A state confirmation request transmitting unit that is triggered by establishment of a predetermined trigger condition and broadcasts an inter-node communication state confirmation request;
An inter-node that receives the inter-node communication status confirmation request and includes identification information of each node device that is a source and a destination of the received inter-node communication status confirmation request and reception status information of the inter-node communication status confirmation request A communication status transmission means for broadcasting a communication status notification;
With
One node device among the plurality of node devices is:
A radio ring network by the plurality of node devices based on the reception status information of the inter-node communication status notification received between the node devices constituting the radio ring network and receiving the inter-node communication status notification Optimization means for optimizing the communication route of
When the optimization unit optimizes the communication route, an optimized route transmission unit that broadcasts the optimized communication route;
With
Each node device further includes:
Storage means for storing the latest communication route optimized by the optimization means;
Data transmission / reception means for performing data transmission / reception with other node devices via the communication route stored in the storage means;
With
It is characterized by that.

  According to the wireless ring network system of the first reference example, when a predetermined trigger condition is satisfied, an inter-node communication state confirmation request is broadcast to other node devices by the state confirmation request transmission unit of each node device. The

  In addition, when an inter-node communication state confirmation request is received from another node device, each node device that is the source and destination of the received inter-node communication state confirmation request is sent to the other node device by the communication state transmission unit of each node device. A node-to-node communication status notification including device identification information and communication status confirmation request reception status information is broadcast.

  Furthermore, when one node device receives an inter-node communication state notification from another node device, based on the reception state information of the inter-node communication state notification received between the respective node devices constituting the wireless ring network, The communication route of the wireless ring network by a plurality of node devices is optimized by the optimization means.

  Here, if a communication failure occurs between certain node devices, both node devices cannot receive the inter-node communication status confirmation request from the other party and either do not transmit the corresponding inter-node communication status notification, or the other party The received inter-node communication status confirmation request is broadcasted to other node devices, including an inter-node communication status notification including reception status information indicating that reception strength is insufficient.

  Therefore, the optimization unit recognizes the section in which the communication failure has occurred between the node devices from the reception state information of the inter-node communication state notification, and based on this, the wireless communication is performed so that the section in which the communication failure has occurred is not used. The communication route of the ring network is optimized.

  The communication route optimized by the optimization unit is broadcast from one node device to another node device by the optimization route transmission unit.

  When the optimized communication route is received or the communication route is optimized by the optimization means provided in itself, the communication route stored in the storage means of each node device is updated to the latest optimum route. The communication route is updated.

  The data transmission / reception means of each node device, the data communication with other node devices on the wireless ring network is always stored in the storage means, and the latest communication route optimized by the optimization means It is done using.

  Therefore, a ring network configuration can be maintained even if communication failures occur in a plurality of sections.

  Further, the wireless ring network system node device according to the present invention described in claim 2 is the wireless ring network system node device according to the present invention described in claim 1, wherein the optimization means includes the received node. And optimizing the communication route of the wireless ring network based on the reception status information of the inter-communication status notification so as to exclude node devices that cannot secure communication with two or more other node devices. To do.

  Further, the wireless ring network system of the second reference example is the same as the wireless ring network system of the first reference example, wherein the optimization unit is configured to perform other operations based on the reception state information of the received inter-node communication state notification. The communication route of the wireless ring network is optimized so as to exclude node devices that cannot secure communication with two or more node devices.

  If a section that can communicate with another node device decreases to “0” or “1” due to a communication failure for a certain node device, the network including that node device cannot be configured in a ring shape.

  Therefore, according to the node device for the wireless ring network system of the present invention described in claim 2, in the node device for the wireless ring network system of the present invention described in claim 1, optimization is performed in one node device. By the means, the communication route of the wireless ring network is optimized so as to exclude node devices that cannot secure communication with two or more other node devices.

  Therefore, even if a node device that cannot ensure communication with two or more other node devices due to a communication failure occurs, the ring network configuration can be maintained.

  According to the wireless ring network system of the second reference example, the wireless ring network system of the first reference example has the same effects as the node device for the wireless ring network system of the present invention described in claim 2. Can be obtained.

  According to a third aspect of the present invention, there is provided a wireless ring network system node device according to the present invention, wherein the wireless ring network system node device according to the first or second aspect of the present invention is the communication stored in the storage means. The apparatus further comprises failure detection means for detecting a communication failure in the route, and the trigger condition is satisfied by detection of the communication failure by the failure detection means.

  Further, the wireless ring network system of the third reference example is the wireless ring network system of the first or second reference example, wherein each of the node devices detects a communication failure in the communication route stored in the storage unit. The apparatus further comprises a failure detection unit, and the trigger condition is established by detecting a communication failure by the failure detection unit.

  According to the node device for a wireless ring network system of the present invention described in claim 3, in the node device for a wireless ring network system of the present invention described in claim 1 or 2, on the communication route of the wireless ring network. When a communication failure occurs between the two node devices in the section existing in the node device, the communication failure is detected by the failure detection unit of each node device, the trigger condition is satisfied, and the state confirmation request transmission unit of each node device An inter-node communication state confirmation request is broadcasted to other node devices.

  For this reason, when a communication failure occurs on a communication route that is being used for data transmission / reception, a communication route to a route that does not use the communication failure section can be generated without generating an event that satisfies the trigger condition. Optimization can be performed.

  According to the wireless ring network system of the third reference example, in the node device for the node device for the wireless ring network system of the first or second reference example, the wireless ring network of the present invention described in claim 3 The same effect as that of the system node device can be obtained.

  According to the present invention, a ring network configuration can be maintained even if a communication failure occurs in a plurality of sections.

It is explanatory drawing which shows the basic composition of embodiment of the wireless network system to which this invention is applied. It is a block diagram which shows schematic structure of the node apparatus of FIG. It is explanatory drawing which shows the state in which the communication failure generate | occur | produced between some node apparatuses of FIG. It is explanatory drawing which shows the communication state between each node apparatus grasped | ascertained by the logical ring structure part of FIG. It is explanatory drawing which shows the communication route of the ring type network optimized by the logical ring structure part of FIG. It is a block diagram which shows schematic structure of one node apparatus used with the radio | wireless network system of a reference example. It is a block diagram which shows schematic structure of the other node apparatus used with the radio | wireless network system of a reference example.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a basic configuration of an embodiment of a wireless network system to which the present invention is applied will be described with reference to an explanatory diagram of FIG.

  The wireless network system of the present embodiment constitutes, for example, a network system of a control system for electrical components arranged in a vehicle interior of a vehicle (not shown). As shown in FIG. It has five node devices 20 (nodes A to E).

  These five node devices 20 constitute a wireless full connect network capable of wireless communication with the node devices 20 of any other nodes A to E. However, for the data transmission / reception between the nodes A to E performed by the node device 20, a communication route of a ring network configured by using a section having a good communication state with priority is used.

  Next, the configuration of the node device 20 will be described with reference to the block diagram of FIG. The node device 20 includes an antenna AT, a reception circuit 21, a transmission circuit 22, a flash memory 23 (corresponding to storage means in claims), a data input / output interface (I / F) 24, a hard disk (HDD) 25, and a CPU 26. ing.

  The receiving circuit 21 demodulates data received from the other node devices 20 received by the antenna AT, stores the data in the HDD 25 via the data input / output I / F 24, and supplies the data to the CPU 26.

  The transmission circuit 22 modulates the data read from the HDD 25 via the data input / output I / F 24 and wirelessly transmits the data from the antenna AT to the counterpart nodes A to E. At this time, the transmission circuit 22 transmits data using the communication route of the ring network stored in the flash memory 23. As shown in FIG. 1, the default communication route stored in the flash memory 23 is a communication route that goes around each node device 20 in the order of the nodes A to E.

  The CPU 26 implements the functions of the communication state confirmation unit 26a, the communication state confirmation data generation unit 26b, and the logical ring configuration unit 26c.

  The communication state confirmation unit 26a monitors the reception of the return data by the reception circuit 21 that has made a round of the communication route of the transmission data transmitted from the transmission circuit 22 to the node devices 20 of the other nodes A to E for a certain period. When the receiving circuit 21 does not receive the return data within a certain period, it detects that a failure has occurred in the communication route of the currently used ring network.

  Further, the communication state confirmation unit 26a, when the reception circuit 21 receives the inter-node communication state confirmation request transmitted by the transmission circuit 22 by the communication state confirmation data generation unit 26b of the other node device 20, is a source node. The reception state (reception strength) of data with the device 20 is confirmed.

  Further, when the reception circuit 21 receives the inter-node communication state notification transmitted by the transmission circuit 22 by the communication state confirmation data generation unit 26b of the other node device 20, the communication state confirmation unit 26a The notification is transferred to the logical ring configuration unit 26c.

  The communication state confirmation data generation unit 26b broadcasts an inter-node communication state confirmation request by the transmission circuit 22 when the communication state confirmation unit 26a detects that a failure has occurred in the communication route of the currently used ring network. Send it.

  Further, the communication state confirmation data generation unit 26b performs inter-node communication when the communication state confirmation unit 26a confirms the reception state (reception strength) of the inter-node communication state confirmation request from the other node device 20 by the reception circuit 21. The status notification is broadcasted by the transmission circuit 22.

  This inter-node communication status notification includes the identification information of the nodes A to E as the transmission source of the inter-node communication status confirmation request received by the receiving circuit 21, the identification information of its own nodes A to E as the reception destination, and the communication status. It includes reception state information indicating a reception state (reception strength) by the reception circuit 21 of the inter-node communication state confirmation request confirmed by the confirmation unit 26a.

  The logical ring configuration unit 26c notifies the inter-node communication state from other node devices 20 transferred from the communication state confirmation unit 26a for a certain period after the communication state confirmation unit 26a detects the occurrence of the communication route failure. To collect. Then, based on the collected reception state information of the inter-node communication state notification from each node device 20, the communication route of the ring network is optimized.

  The optimization of the communication route of the ring network can be performed as follows, for example. That is, the section (which node device 20 is between) is identified from the identification information of the source nodes A to E included in the inter-node communication status notification from each node device 20, and the received status information The reception status of the section is evaluated by scoring according to the level of reception strength.

  Then, based on the evaluation contents of the reception state, the traveling algorithm of the genetic algorithm (GA) is applied to the Traveling Salesperson Problem (TSP). A communication route of a ring network that allows crossover is determined. This determined communication route is taken as the optimization result.

  The logical ring configuration unit 26 c overwrites and saves the optimized communication route of the ring network in the flash memory 23.

  Next, in the wireless network system 1 of the present embodiment in which the node device 20 configured as described above is used for the nodes A to E, the node device 20 in the case where a communication failure occurs and the communication route is optimized The operation will be described.

  For example, as shown in the explanatory diagram of FIG. 3, when a communication failure occurs between the node devices 20 in a plurality of sections (between node C and node D, between node A and node E), the node device of each node A to E Even if 20 transmits data to the node devices 20 of the other nodes A to E, return data that has made a round of the communication route is not received by the receiving circuit 21.

  Therefore, in each node device 20, the occurrence of a communication route failure is detected by the communication state confirmation unit 26a, and an inter-node communication state confirmation request is transmitted from the transmission circuit 22 to each other node device 20 by the communication state confirmation data generation unit 26b. Broadcast transmission.

  In each node device 20, the inter-node communication state confirmation request broadcast by other node devices 20 is received by the reception circuit 21, and the reception state (reception strength) is confirmed by the communication state confirmation unit 26a.

  Then, in each node device 20, the inter-node communication state notification including the reception state information indicating the confirmed reception state (reception strength) and the identification information of each node device 20 of the transmission source and the reception destination is communication state confirmation data. Broadcast is transmitted from the transmission circuit 22 to each other node device 20 by the generation unit 26b.

  Furthermore, in each node device 20, the inter-node communication state notification broadcast by other node devices 20 is received by the receiving circuit 21 and collected for a certain period. Then, depending on the contents of the inter-node communication status notifications collected from the respective node devices 20 within a certain period and the section in which the inter-node communication status notifications are not received by the receiving circuit 21, the node devices 20 of the respective nodes A to E. The communication state for all the sections of the full connect network is grasped by the logical ring configuration unit 26c.

  FIG. 4 is an explanatory diagram illustrating a communication state between the node devices 20 of the nodes A to E grasped by the logical ring configuration unit 26 c of each node device 20. Here, for simplification of explanation, the communication state between the node devices 20 is shown in two stages: reception state (reception strength) good (◯) and reception state (reception strength) failure (×). Yes. A blank column is a section where the inter-node communication state notification is not received by the receiving circuit 21.

  Therefore, in each node device 20, based on the communication state between the node devices 20 of each of the nodes A to E, for example, as shown in the explanatory diagram of FIG. The communication route of the ring network that does not use between D and between node A and node E) is determined by the logical ring configuration unit 26c.

  Here, the reception state information of the inter-node communication state notification can be regarded as indicating the state of communication performed between the transmission source node device 20 and the reception destination node device 20 in both directions. . Therefore, the logical ring configuration unit 26c of each node device 20 determines the communication state between the node devices 20 of the nodes A to E based on the reception state information of the inter-node communication state notification received from each other node device 20. You will be aware of all sections of the full connect network. For this reason, the communication route of the ring network determined by the logical ring configuration unit 26c of each node device 20 is the same route.

  In each node device 20, the communication route of the ring network determined by the logical ring configuration unit 26c is overwritten and saved in the flash memory 23 as the latest optimized communication route. As a result, in each node device 20, the latest optimized communication stored in the flash memory 23 is overwritten in place of the previous communication route in which a communication failure has occurred in the subsequent data transmission to the other node devices 20. The transmission circuit 22 uses the route.

  As is clear from the above description, in the wireless network system 1 of the present embodiment, the state confirmation request transmitting means in the claims is constituted by the communication state confirmation data generating unit 26 b and the transmission circuit 22 of the CPU 26. In the present embodiment, the communication state transmission means in the claims is also constituted by the communication state confirmation data generation unit 26 b and the transmission circuit 22 of the CPU 26.

  Further, in the present embodiment, the optimization means in the claims is constituted by the logical ring configuration unit 26 c of the CPU 26 and the transmission circuit 22. In the present embodiment, the data transmission / reception means in the claims includes a reception circuit 21 and a transmission circuit 22. Furthermore, in this embodiment, the failure detection means in the claims is constituted by the communication state confirmation unit 26a of the CPU 26.

  As described above, according to the wireless network system 1 of the present embodiment, when a failure occurs in the communication route of the ring network, each node device 20 bypasses the failure occurrence section even if there are a plurality of failure occurrence sections. The communication route of the ring network can be optimized to the new common route, and the ring network configuration can be maintained.

  In the above-described embodiment, when a failure occurs in the communication route of the ring network, each node device 20 optimizes the communication route to the same route. However, when a failure occurs in the communication route of the ring network, as in the wireless ring network system of the reference example, one node device 20 represents the communication route on behalf of the node, and the optimized communication route is changed to another. The node device 20 may be notified.

  In that case, a node device having a configuration different from that in FIG. 2 is used for each of the nodes A to E. Specifically, the configuration of the node device to be used is further different between one of the nodes A to E and the other four nodes.

  For example, the node device 20A shown in the block diagram of FIG. 6 is used for the node A, and the node device 20B shown in the block diagram of FIG. 7 is used for the nodes B to E.

  As shown in FIG. 6, the node device 20A of the node A is similar to the node device 20 of FIG. 2 in that the CPU 26 has functions of the communication state confirmation unit 26a, the communication state confirmation data generation unit 26b, and the logical ring configuration unit 26c. Is realized. That is, the node device 20A of the node A shown in FIG. 6 corresponds to an embodiment of the node device for the wireless ring network system of the first to third reference examples.

  Then, the logical ring configuration unit 26c of the node device 20A not only saves the optimized communication route of the ring network in the flash memory 23 but also causes the transmission circuit 22 to perform broadcast transmission. Other configurations and operations of the node device 20A are the same as those of the node device 20 of FIG.

  On the other hand, as shown in FIG. 7, the node devices 20B of the nodes B to E, like the node device 20 of FIG. 2, have the functions realized by the CPU 26, that is, the communication state confirmation unit 26a and the communication state confirmation data generation unit 26b. Thus, the function of the logical ring configuration unit 26c is omitted.

  Then, the reception circuit 21 of the node device 20B overwrites and saves the optimized ring network communication route broadcast from the transmission circuit 22 by the logical ring configuration unit 26c of the node device 20A in the flash memory 23. The other configurations and operations of the node device 20B are the same as those of the node device 20 of FIG. 2 except for the configurations and operations related to the omitted logical ring configuration unit 26c.

  Therefore, when the node device 20A is used for the node A and the node device 20B is used for the other nodes B to E, the failure of the communication route of the ring network among the operations performed in the node device 20 of FIG. The operations from the occurrence detection to the broadcast transmission of the inter-node communication state notification are similarly performed in each of the node devices 20A and 20B.

  On the other hand, the communication status notification between nodes transmitted by broadcast is collected for a certain period, and the communication status between the node devices 20A and 20B of each of the nodes A to E is grasped from the contents and the like. The operation until the communication route of the ring network that does not use the failure occurrence section is optimized is performed only in the node device 20A of the node A in which the CPU 26 realizes the function of the logical ring configuration unit 26c.

  Then, the latest optimized ring network communication route is broadcast from the node device 20A of the node A to the node devices 20B of the other nodes B to E, and received by the node devices 20B of the nodes B to E. The latest optimized ring network communication route received by the circuit 21 is overwritten and stored in the flash memory 23 as the latest optimized communication route.

  Therefore, even if the node devices 20A and 20B of FIGS. 6 and 7 are used for the node A and the other nodes B to E, the data transmission to the other node devices 20A and 20B in each of the node devices 20A and 20B is as follows. The transmission circuit 22 uses the latest optimized communication route overwritten and stored in the flash memory 23 in place of the communication route up to which the communication failure has occurred.

  In this reference example, the optimization route transmission means is configured by the logical ring configuration unit 26c and the transmission circuit 22 of the node device 20A of FIG.

  Even in such a configuration, when a failure occurs in the communication route of the ring network, even if there are a plurality of failure sections, the node device 20A sets the communication route of the ring network to a new route that bypasses the failure occurrence section. It is possible to optimize and notify other node devices 20B to maintain the ring network configuration.

  As can be seen from FIG. 1 and FIG. 5, in order to configure the communication route of the ring network, in the node devices 20, 20A, 20B of the nodes A to E, the other two nodes A to E are used. Communication with the other node devices 20, 20A, 20B must be ensured. On the contrary, if communication with the node devices 20, 20A, 20B of the other nodes A to E is ensured only in one section or not secured at all, the node devices 20, 20A, 20B cannot be a node (node device) constituting a communication route of a ring network.

  Therefore, when the logical ring configuration unit 26c of the node device 20 of FIG. 2 or the node device 20A of FIG. 6 optimizes the communication route of the ring network, the node devices 20, 20A, The node devices 20, 20A, and 20B of the nodes A to E in which the communication with 20B is ensured to be less than two are excluded from the nodes (node devices) constituting the communication route of the ring network. Also good.

  In the node devices 20, 20A, and 20B of FIGS. 2, 6, and 7 described above, when a communication route failure is detected by the communication state confirmation unit 26a, a communication state confirmation data generation unit is triggered by this. 26b is assumed to transmit a node-to-node communication state confirmation request from the transmission circuit 22 to other node devices 20 by broadcast.

  However, for example, when a switch (not shown) provided separately in the node devices 20, 20A, and 20B is operated, the communication state confirmation data generation unit 26b sends another inter-node communication state confirmation request from the transmission circuit 22 using this as a trigger. It is good also as a structure which makes each node apparatus 20 perform broadcast transmission.

  Alternatively, when data transmission is not performed, the communication state confirmation data generation unit 26b of each of the node devices 20, 20A, 20B sends an inter-node communication state confirmation request from the transmission circuit 22 to each other node at regular intervals. It is good also as a structure which makes the apparatus 20 broadcast-transmit.

  Further, when the node devices 20, 20 </ b> A, and 20 </ b> B are installed and the wireless network system 1 is started up, the inter-node communication state confirmation request may be broadcast from the transmission circuit 22 to the other node devices 20.

  In these cases, the communication state confirmation unit 26a detects the occurrence of a communication route failure, and the communication state confirmation data generation unit 26b triggers the transmission of an inter-node communication state confirmation request by detecting the occurrence of the failure. The configuration for doing so may be omitted.

  The present invention is extremely useful when used in a wireless ring network system in which a wireless ring network is configured by a plurality of node devices.

DESCRIPTION OF SYMBOLS 1 Wireless network system 20, 20A, 20B Node apparatus 21 Reception circuit 22 Transmission circuit 23 Flash memory 24 Data input / output interface 25 Hard disk 26 CPU
26a Communication state confirmation unit 26b Communication state confirmation data generation unit 26c Logical ring configuration unit AT antenna

Claims (3)

In a node device for a wireless ring network system in which a wireless ring network is configured by a plurality of node devices,
A state confirmation request transmitting unit that is triggered by establishment of a predetermined trigger condition and broadcasts an inter-node communication state confirmation request;
An inter-node that receives the inter-node communication status confirmation request and includes identification information of each node device that is a source and a destination of the received inter-node communication status confirmation request and reception status information of the inter-node communication status confirmation request A communication status transmission means for broadcasting a communication status notification;
A radio ring network by the plurality of node devices based on the reception status information of the inter-node communication status notification received between the node devices constituting the radio ring network and receiving the inter-node communication status notification Optimization means for optimizing the communication route of
Storage means for storing the latest communication route optimized by the optimization means;
Data transmission / reception means for performing data transmission / reception with other node devices via the communication route stored in the storage means;
A node device for a wireless ring network system, comprising:   The optimization unit is configured to exclude node devices that cannot secure communication with two or more other node devices based on the reception state information of the received inter-node communication state notification. 2. The node device for a wireless ring network system according to claim 1, wherein a communication route is optimized.   3. The apparatus according to claim 1, further comprising failure detection means for detecting a communication failure in the communication route stored in the storage means, wherein the trigger condition is satisfied by detection of the communication failure by the failure detection means. A node device for a wireless ring network system as described.

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