JP2009049500A - Wireless communication device, wireless communication method, wireless communication program, node, and network restoration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To evade useless connection procedure processing that may occur compositely between nodes when a fault occurs in the node in a hierarchical wireless network. <P>SOLUTION: The wireless communication device to be arranged in each node of the hierarchical wireless network includes: an information communication means for performing information communication with another node; a fault sub-network information storage means for storing fault sub-network information which is received from another node; a network withdrawal means for withdrawing from the sub-network when the self node belongs to the sub-network with the fault; a node information collecting means for collecting node information from one or more circumferential nodes after the withdrawal from the sub-network; a connection request control means for preventing a connection request to another node belonging to the sub-network with the fault, based on the node information of one or more other nodes and the fault sub-network information; and a connection processing means for performing the connection processing with another node other than the node which is prevented by the connection request control means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a wireless communication device, a wireless communication method, a wireless communication program, a node, and a network repair system, and, for example, a wireless communication device and method provided in a node device that forms a hierarchical network such as a tree-type multihop network. It can be applied to programs, nodes, and network repair systems.

  Conventionally, when a failure occurs in a node device forming a wireless network, various methods can be used as a method in which a node device connected to the failed node device newly connects to another node device to repair the wireless network. There is.

  For example, Patent Document 1 describes a technology in which, in a hierarchical wireless network, when a failure occurs in a parent device, the child device bypasses the failed node and reconnects to repair the network. Has been.

  Further, for example, Patent Document 2 describes a method in which a child node establishes a parent-child relationship with a new parent node in a so-called ZigBee (registered trademark) network, and connects to the new parent node to repair the network. ing.

JP 2007-089010 A Tatetsu, “Practical Introductory Network ZigBee Development Handbook”, Rick Telecom Publishing Co., Ltd. 124-126

  However, if the repair process by the above method is simply executed, if the network participation from the node under the faulty node is accepted, the fault repair process is required again with the node, and the connection between the nodes is wasted. There has been a problem that procedural processing occurs and wasteful processing is performed.

  Therefore, when a failure occurs in a node constituting a hierarchical wireless network, it is possible to avoid unnecessary connection procedure processing between nodes that can occur in a complex manner, and to improve communication efficiency in the entire network. There is a need for a wireless communication method, a wireless communication program, a node, and a network repair system.

  In order to solve such a problem, a wireless communication device according to a first aspect of the present invention includes: (1) information communication means for performing information communication with other nodes in each wireless communication device included in each of nodes constituting a hierarchical wireless network; (2) Faulty subnet information storage means for storing faulty subnet information received from other nodes, (3) Network leaving means for leaving the subnet when the own node belongs to the faulty subnet, (4) After leaving the subnet, a node information collection unit that collects node information from one or more other surrounding nodes, and (5) a failure occurred based on the node information and the failed subnet information of one or more other nodes Connection request control means for suppressing connection requests to other nodes belonging to the subnet, and (6) other nodes suppressed by the connection request control means. Characterized in that it comprises a connection processing means for performing connection processing with the outside of another node.

  According to a second aspect of the present invention, there is provided a wireless communication device provided in each of nodes constituting a hierarchical wireless network, comprising: (1) information communication means for performing information communication with other nodes; and (2) a wireless network. Own node address information storage means for storing address information of the own node; and (3) upon receiving a node information collection request from other surrounding nodes, the fault subnet information and the own node address information included in the node information collection request, And a response request control means for suppressing a response to the node information collection request from the other node when the own node belongs to the failed subnet.

  A wireless communication method according to a third aspect of the present invention is a wireless communication method corresponding to the wireless communication apparatus according to the first aspect of the present invention. That is, the wireless communication method according to the third aspect of the present invention is the wireless communication method performed by each of the nodes constituting the hierarchical wireless network. (1) An information communication step in which the information notification means performs information communication with other nodes (2) a failed subnet information storage step in which the failed subnet information storage means stores the failed subnet information received from another node; and (3) if the network leaving means belongs to the subnet in which the own node has failed, A network leaving step for leaving the network, (4) a node information collecting step for the node information collecting means to collect node information from one or more other surrounding nodes after leaving the subnet, and (5) a connection request control means for Based on the node information of one or more other nodes and the failed subnet information, other nodes belonging to the subnet where the failure occurred A connection request control step for suppressing a connection request to a node, and (6) a connection processing step in which the connection processing means performs a connection processing with another node other than the other nodes suppressed by the connection request control means. And

  A wireless communication method according to a fourth aspect of the present invention is a wireless communication method corresponding to the wireless communication apparatus according to the second aspect of the present invention. That is, the wireless communication method of the fourth aspect of the present invention is the wireless communication method performed by each of the nodes constituting the hierarchical wireless network, wherein (1) an information communication step in which information communication means performs information communication with other nodes; (2) The own node location information storage means stores the address information of the own node in the wireless network, and (3) the response request control means sends a node information collection request from other surrounding nodes. When received, if the own node belongs to the failed subnet based on the failed subnet information and the own node address information included in the node information collection request, a response to the node information collection request from the other node And a response request control process for suppressing the response.

  According to a fifth aspect of the present invention, there is provided a wireless communication program for causing each of nodes constituting a hierarchical wireless network to function. (1) Information communication means for performing information communication with other nodes; (2) Faulty subnet information storage means for storing faulty subnet information received from other nodes, (3) Network leaving means for leaving the subnet when the own node belongs to the faulty subnet, (4) After leaving the subnet, Node information collecting means for collecting node information from one or more other nodes, (5) Based on the node information and the failed subnet information of one or more other nodes, to other nodes belonging to the subnet where the failure occurred Connection request control means for suppressing connection requests, (6) Other than other nodes suppressed by connection request control means It is intended to function as a connection processing means for performing node and connection process.

  According to a sixth aspect of the present invention, there is provided a wireless communication program for functioning each of nodes constituting a hierarchical wireless network. (1) Information communication means for performing information communication with other nodes; (2) In a wireless network Own node address information storage means for storing address information of the own node; (3) when a node information collection request is received from other surrounding nodes, the failure subnet information and the own node address information included in the node information collection request are Based on this, when the own node belongs to the subnet where the failure has occurred, the node is caused to function as a response request control unit that suppresses a response to the node information collection request from the other node.

  A node according to a seventh aspect of the present invention comprises the wireless communication apparatus according to the first aspect of the present invention.

  A node according to an eighth aspect of the present invention includes the wireless communication apparatus according to the second aspect of the present invention.

  A network repair system according to a ninth aspect of the present invention is the network repair system when a failure occurs in any of a plurality of nodes constituting a hierarchical wireless network. Each node is a wireless communication apparatus according to the first aspect of the present invention. It is characterized by providing.

  A network repair system according to a tenth aspect of the present invention is a network repair system when a failure occurs in any of a plurality of nodes constituting a hierarchical wireless network. Each node is a wireless communication apparatus according to the second aspect of the present invention. It is characterized by providing.

  According to the present invention, when a failure occurs in a node constituting a hierarchical wireless network, it is possible to avoid useless connection procedure processing between nodes that can occur in a complex manner, and to improve communication efficiency in the entire network. it can.

(A) First Embodiment Hereinafter, a first embodiment of a wireless communication apparatus, a wireless communication method, a wireless communication program, a node, and a network restoration system according to the present invention will be described with reference to the drawings.

  In the first embodiment, for example, a case will be described in which each of a plurality of nodes forming a wireless network adopting a tree-type multi-hop includes the wireless communication apparatus of the present invention.

  In the first embodiment, for convenience of explanation, a case where each node adopts ZigBee (registered trademark) is illustrated. Of course, the present invention is not limited to ZigBee and can be applied to other wireless communication apparatuses.

(A-1) Configuration of the First Embodiment FIG. 2 is a network configuration diagram showing a schematic configuration image of the wireless network of the first embodiment.

  The radio network 20 shown in FIG. 2 has a plurality (seven in FIG. 2) of nodes 21 to 27, which are connected by radio links so as to form a tree-type multi-hop network.

  In FIG. 2, the node 21 is a root node, and when the node 21 is a parent node, the node 22 and the node 23 are child nodes. When the node 22 is a parent node, the node 24 is a child node. When the node 23 is a parent node, the nodes 25 and 26 are child nodes, and when the node 25 is a parent node, the node 27 is a child node.

  A network address 41 is assigned to each of the nodes 21 to 27. The network address 41 uniquely determines a parent-child relationship between nodes and a network depth, and is given in the network formation process. The network addresses 41 of the nodes 21 to 27 are stored in the information storage unit 32 of each node.

  As described above, the network address 41 may have any system as long as the parent-child relationship between the nodes and the network depth are uniquely determined.

  In the first embodiment, the network address 41 is assigned as follows. For example, in the first embodiment, as shown in FIG. 2, the network address 41 is exemplified by a three-digit number. For example, when the network address 41 is “1n0”, it indicates that the node is the parent node of the network depth “1” with the subnet “100” when n = 0, and the network depth “2” with the subnet “100” when n ≠ 0. Indicates the nth child node. Since the node 21 is a root node, the network address 41 is “000”.

  FIG. 3 is an internal configuration diagram showing an internal configuration of the node. All the nodes 21 to 27 shown in FIG. 2 have the internal configuration shown in FIG. In FIG. 3, this is indicated as a node 30.

  In FIG. 3, the node 30 according to the first embodiment includes at least an information processing unit 31, an information storage unit 32, and a wireless communication unit 33.

  Although the hardware configuration of the node 30 is omitted, for example, the node 30 includes a CPU, a ROM, a RAM, and other hardware, and the CPU reads and executes a processing program using data necessary for processing. Thus, the function of the node 30 is realized.

  The information processing unit 31 controls the overall processing of the node 30. FIG. 4 is a functional block diagram illustrating functions of the information processing unit 31.

  In FIG. 4, the information processing unit 31 includes a network connection processing function unit 311, a failure subnet information notification function unit 312, a network disconnection processing function unit 313, a node information collection processing function unit 314, a selection function unit 315, and a failure detection function unit 316. Function as.

  The network connection processing function unit 311 performs a predetermined connection procedure with a node located in the vicinity at the time of network connection, and establishes a connection with the node.

  The failure subnet information notification function unit 312 notifies a child node of a packet including failure subnet information when a failure occurs.

  When a failure occurs in the parent node, the failure subnet information notification function unit 312 uses the network address 41 of the parent node as failure subnet information, forms a disassociation notification packet having this failure subnet information, and notifies the child node.

  In addition, when the failure subnet information notification function unit 312 receives the disassociation notification packet from the parent node, the failure subnet information notification function unit 312 stores the failure subnet information included in the received disassociation notification packet in the information storage unit 32 and also stores the failure subnet information in its own node. If the node exists, the received disassociation notification packet is transmitted to the child node. As a result, it is possible to notify all nodes belonging to the subnet formed by the failed node that the parent node has failed.

  The network leave processing function unit 313 performs network leave processing of the own node when the own node belongs to the failed subnet. Thereby, it is possible to leave the network where the failure has occurred. In the first embodiment, when a disassociation notification packet is received, a network leaving process is executed.

  The node information collection processing function unit 314 collects beacon packets that are node information from one or more other neighboring nodes.

  When the node information collection processing function unit 314 leaves the network, the node information collection processing function unit 314 transmits a beacon request packet toward a nearby node. At this time, the node information collection processing function unit 314 delays by a predetermined delay time (hereinafter also referred to as a connection request start delay time) from when it leaves the network of its own node to when the beacon request packet is transmitted.

  The node information collection processing function unit 314 waits for reception of a beacon packet from a nearby node for a predetermined time after transmitting the beacon request packet (this is also referred to as beacon reception wait delay processing).

  If no beacon packet is received during the beacon packet reception standby time after the beacon request packet is transmitted, the node information collection processing function unit 314 may transmit the beacon request packet again.

  Further, when receiving the beacon packet, the node information collection processing function unit 314 stores the received beacon packet information and the network address of the transmission source node in the information storage unit 32.

  The selection function unit 315 refers to the network selection information 43 and the failed subnet information 42 in the information storage unit 32, determines whether the transmission source node of the beacon packet belongs to the failed subnet, and determines the network to be connected. To choose.

  That is, if the transmission source node of the beacon packet does not belong to the failed subnet, the selection function unit 315 determines that the transmission source node is a healthy parent node and selects it as a network participation destination. Further, when the transmission source node of the beacon packet belongs to a failed subnet, it is determined that the transmission source node is a failed parent node and is not selected as a network participation destination.

  The failure detection function unit 316 detects a failure of the parent node. When the failure detection function unit 316 detects a failure, it notifies the failure subnet information notification function unit 312 to that effect. In addition, the existing failure detection method can be widely applied as the failure detection method of the failure detection function unit 316.

  The information storage unit 32 holds work information necessary for the information processing process. FIG. 5 shows information stored in the information storage unit 32. In FIG. 5, items of information stored in the information storage unit 32 are a network address 41, failure subnet information 42, and network selection information 43.

  The network address 41 indicates a network address assigned to itself. When the node 30 is given a network address 41 when the node 30 is connected to the parent node to form a network, the node 30 stores the network address 41 in the information storage unit 32.

  The failure subnet information 42 is information indicating a subnet in which a failure has occurred. When the node 30 receives the disassociation notification packet, the node 30 stores the failed subnet information included in the disassociation notification packet in the information storage unit 32. Note that the number of pieces of failed subnet information is not limited to one, and can be applied to a plurality of pieces.

  The network selection information 43 stores beacon packets received from neighboring nodes.

  The wireless communication unit 33 wirelessly communicates information according to a predetermined wireless communication method.

(A-2) Operation of the First Embodiment Next, the operation of network restoration processing in the wireless network of the first embodiment will be described with reference to the drawings.

  FIG. 1 is a sequence illustrating network repair processing according to the first embodiment.

  In FIG. 1, when a failure occurs in the node 23 shown in FIG. 2, processing until a node 25 having the node 23 as a parent node and a node 27 having the node 25 as a parent node join a normal network. Will be described.

  First, when a failure occurs in the node 23, the node 25 is disconnected from the node 23 (step S101). The information processing unit 31 of the node 25 detects a failure of the node 23 that is the parent node based on the communication interruption with the node 23.

  When the failure detection of the node 23 is performed in the node 25, the information processing unit 31 of the node 25 stores the network address 41 (“200”) of the parent node node 23 as the failure subnet information 42 in the information storage unit 32. Then, a disassociation notification packet including the failed subnet information 42 is transmitted to the child node (step S102).

  At this time, the process proceeds without transmitting a disassociation notification packet from the node 23 where the failure has occurred. In addition, after transmitting the disassociation notification packet, the node 25 establishes a connection with another node different from the node 23 and performs normal network participation. This network participation process in the node 25 is the same as the process in the node 27 described later.

  When the disassociation notification packet is given from the node 25 to the node 27, the information processing unit 31 of the node 27 stores the failed subnet information 42 included in the disassociation notification packet in the information storage unit 32.

  If the child node exists in the own node, the received disassociation notification packet is transmitted to the child node. In this example, since no child node exists in the node 27, the disassociation notification packet is not transmitted.

  Since the node 27 can recognize that a failure has occurred in the network to which the node is connected by receiving the disassociation notification packet, the information processing unit 31 performs a process of leaving the currently connected network ( Step S103).

  When the node 27 leaves the current network, the information processing unit 31 inserts a delay time for a predetermined time (step S104). Then, after the delay time has elapsed, the information processing unit 31 broadcasts a beacon request packet toward the neighboring nodes (step S105).

  When the beacon request packet is transmitted, the information processing section 31 of the node 27 performs a beacon reception waiting delay process in order to wait for the reception of the beacon packet for a predetermined time (step S106).

  On the other hand, in the node 24 that has received the beacon request packet transmitted by the node 27, a predetermined beacon transmission delay process is performed (step S107). Then, a beacon packet is transmitted at the node 24 after a predetermined random delay time has elapsed (step S108).

  Similarly, when receiving a beacon request packet from the node 27, the node 26 performs a predetermined beacon transmission delay process (step S109), and transmits a beacon packet after a predetermined random time has elapsed (step S110). ).

  Here, the beacon transmission delay process in the node 24 and the node 26 is for preventing collision of beacon packets between the nodes, and an existing method can be applied as the beacon transmission delay process.

  In the node 27, when the beacon packet is not received within the beacon reception waiting delay time, the information processing section 31 may repeatedly perform the beacon request packet sending process and the beacon reception waiting delay process a predetermined number of times (steps). S105 and S106).

  When the node 27 receives beacon packets from the node 24 and the node 26 within the beacon reception waiting delay time, the information processing unit 31 stores the received beacon packet information in the information storage unit 32.

  Then, the information processing unit 31 performs an improved network selection process based on the information stored in the information storage unit 32 (step S111).

  FIG. 6 is a flowchart showing the operation of the improved network selection process.

  First, the information processing unit 31 deletes beacon packet information in which the network address 41 belongs to the subnet of the failed subnet information 42 from the network selection information 43 stored in the information storage unit 32 (step S301).

  At this time, the information processing unit 31 holds the beacon packet information of the network address that does not belong to the subnet of the failed subnet information 42 as it is.

  For example, FIG. 5 shows an example of the contents stored in the information storage unit 32 of the node 27. As illustrated in FIG. 5, the network address 41 is “211” of the node 27 itself, and the failed subnet information 42 is “200”, which is the network address of the node 23. In FIG. 5, the beacon packet information 431 of the node 24 and the beacon packet information 432 of the node 26 are stored as the network selection information 43.

  In a state where such information is stored in the information storage unit 32, the information processing unit 31 deletes the beacon packet information 432 belonging to the subnet “200” of the failed subnet information 42 from the network selection state. The beacon packet information 431 that does not belong to the subnet of the failed subnet information 42 is retained as it is.

  Next, the information processing section 31 selects an optimal network participation destination from the information held in the network selection information 43 as it is (step S302).

  In this case, since the information held in the network selection information 43 is only the beacon packet information 431 of the node 24, the information processing unit 31 selects the node 24 as a network participation destination.

  When a plurality of pieces of information are held in the network selection information 43, for example, a node having a high link quality is selected based on the link quality information, or a node having a small number of hops to the root node is selected, for example. Or, an optimal node may be selected. For example, with regard to link quality, it is possible to apply a method in which a link having a relatively high received electric field strength is determined to have a high link quality or a link having a relatively small packet loss is determined to have a high link quality.

  In this way, when the network participation destination is selected in the node 27, the information processing section 31 of the node 27 transmits an association request packet to the node 24 of the network participation destination (step S112). As a result, it is possible to request the node 24, which is a healthy parent node, to participate in the network.

  When the association request packet is given from the node 27, the node 24 sends an association response packet to the node 27 (step S113). Thereby, the node 27 can participate in the network by completing the connection with the node 24, and thus the failure repair process of the node 27 is completed.

  Note that, as described above, also in the node 25 that is the parent node of the node 27, the failure repair processing of the own node 25 is completed by executing the processing in steps S103 to S113.

(A-3) Effect of First Embodiment As described above, according to the first embodiment, when a child node exists after a failure is detected, failure subnet information is notified to the child node, and By storing the failed subnet information, the failed subnet information can be recognized.

  In addition, according to the first embodiment, after leaving the failed subnet, by referring to the failed subnet information and selecting a node that does not belong to the failed subnet as a new network participation destination, Therefore, it is possible to eliminate unnecessary protocol generation and unnecessary processing.

(B) Second Embodiment Next, a second embodiment of the wireless communication apparatus, wireless communication method, wireless communication program, node, and network restoration system of the present invention will be described with reference to the drawings.

(B-1) Configuration of Second Embodiment The second embodiment is different from the first embodiment in the function of the information processing unit 31. FIG. 7 is a functional block diagram illustrating functions of the information processing unit 41 according to the second embodiment.

  As illustrated in FIG. 7, the information processing unit 41 according to the second embodiment is different from the first embodiment in that the node information collection processing function unit 411 includes a failure subnet inspection processing function unit 412. The other functional units are the same as those described in the first embodiment.

  The node information collection processing function unit 411 performs communication processing of beacon signals with neighboring nodes as in the first embodiment. The node information collection processing function unit 411 transmits a beacon request packet toward a neighboring node after leaving the network of the own node.

  Here, the node information collection processing function unit 411 is different from the first embodiment in that it transmits the beacon request packet including the failed subnet information. In this way, by transmitting the beacon request packet including the failed subnet information to the neighboring node, the neighboring node can be made to recognize the failed subnet information.

  Further, when receiving the beacon request packet, the node information collection processing function unit 411 stores the failed subnet information included in the received beacon request packet in the information storage unit 32.

  After receiving the beacon request packet, the failed subnet inspection processing function unit 412 refers to the failed subnet information stored in the information storage unit 32 and checks whether the own node belongs to the subnet of the failed subnet information. is there.

  When the own node belongs to the subnet of the failed subnet information, the beacon transmission delay process and the beacon packet transmission process are not performed. On the other hand, when the own node does not belong to the subnet of the failed subnet information, beacon transmission delay processing and beacon packet transmission processing are performed as in the first embodiment.

(B-2) Operation of Second Embodiment Next, the operation of the network restoration process in the wireless network of the second embodiment will be described with reference to the drawings.

  FIG. 8 is a sequence illustrating network repair processing according to the second embodiment.

  In the second embodiment, network participation processing in the node 25 and the node 27 when a failure occurs in the node 23 illustrated in FIG. 2 will be described.

  First, when a failure occurs in the node 23, as in the first embodiment, the node 25 is disconnected from the node 23 (step S101) and detects the failure of the node 23. Then, the node 25 uses the network address 41 (“200”) of the failed node 23 as the failed subnet information 42, and transmits a disassociation notification packet including the failed subnet information 42 to the node 27 that is a child node (step). S102).

  In the node 27 that has received the disassociation notification packet including the failed subnet information 42, the information processing unit 31 stores the failed subnet information 42 in the information storage unit 32 and performs the network leaving process as in the first embodiment. (Step S103).

  When the network disconnection process is performed, in the node 27, the information processing unit 31 performs a connection request start delay process (step S104), and a beacon request packet is transmitted by broadcast after a predetermined time has elapsed (step S104). S201). Further, in the node 27, after transmitting the beacon request packet, a delay process for waiting for beacon reception from a neighboring node is performed (step S106).

  At this time, the node 27 adds the failed subnet information 42 (the network address “200” of the node 23) to the beacon request packet and transmits it. Thereby, it is possible to make the node located in the vicinity of the node 27 recognize the failure subnet information 42 of the failed network.

  The node 24 and the node 26 that have received the beacon request packet transmitted by the node 27 perform a failed subnet inspection process (steps S202 and S203).

  FIG. 9 is an operation flowchart illustrating the failure subnet inspection process according to the second embodiment.

  As shown in FIG. 9, the node that has received the beacon request packet determines whether or not the failed subnet information included in the received beacon request packet is a subnet to which the node belongs (step S401).

  When it is determined that the own node does not belong to the failed subnet, the subnet search process is terminated, and when it is determined that the own node belongs to the failed subnet, the information processing unit 31 performs beacon transmission delay processing and The beacon transmission process is not performed (step S402), and the process ends.

  For example, in FIG. 8, since the failed subnet information 42 is the network address “200” of the node 23, the node 26 (network address 41 = “220”) is determined to belong to the failed subnet. That is, since the node 26 belongs to the failed subnet, the beacon transmission delay process and the beacon transmission process are not performed.

  On the other hand, in the case of the node 24, since the network address 41 is “110”, it is determined that the node 24 does not belong to the failed subnet. Then, in the node 24, a beacon packet is transmitted to the node 27 after the random time has elapsed by the beacon transmission delay process (step S107) (step S108).

  As described above, since the node belonging to the failed subnet does not transmit the beacon packet, it is possible to avoid the execution of unnecessary protocol processing and to improve the communication efficiency of the entire network.

  Next, in the node 27, when a beacon packet is received within the beacon reception waiting delay time, a network selection process 216 is executed (step S111).

  Since the network selection processing 216 can apply the same processing as in the first embodiment, a detailed description is omitted. In the second embodiment, a node belonging to the failed subnet (in this example, There is no beacon packet from node 26). Therefore, it is possible to reduce the burden related to the network selection process.

(B-3) Effects of Second Embodiment As described above, according to the second embodiment, in addition to the effects described in the first embodiment, a long address beacon that does not include a network address in a beacon packet. Applicable even in operation in mode.

(C) Other Embodiments Although various modified embodiments have been described in the description of the first and second embodiments, the following modified embodiments can be applied.

  In the first and second embodiments, the application in the case of a tree-type multi-hop network has been described. However, as long as it is configured hierarchically between a plurality of nodes, it is limited to a tree-type network. Rather, it can be widely applied.

  In the first and second embodiments, the node that has detected the failure transmits the failure subnet information to the child node of the own node. However, the node that has detected the failure may broadcast the failure subnet information to widely notify the entire network of the failure subnet information. In this case, the burden of communication processing of the entire network is larger than in the first and second embodiments, but complex network repair processing can be avoided as in the first and second embodiments. .

  In the first and second embodiments, the case where the node device includes ZigBee (registered trademark) as a wireless communication device has been described as an example. However, the present invention can be widely applied to wireless communication devices other than ZigBee (registered trademark). it can.

  In the first and second embodiments, the case where it is realized as software processing has been described as an example. However, if it can be realized by hardware processing, it may be realized by hardware.

It is a sequence which shows the network restoration process of 1st Embodiment. It is a whole lineblock diagram showing the whole radio network composition of a 1st embodiment. It is an internal block diagram which shows the internal structure of the node of 1st Embodiment. It is a functional block diagram which shows the function of the information processing part of 1st Embodiment. It is a figure which shows the structural example of the information storage part of 1st Embodiment. It is an operation | movement flowchart which shows the network selection process of 1st Embodiment. It is a functional block diagram which shows the function of the information processing part of 2nd Embodiment. It is a sequence which shows the network restoration process of 2nd Embodiment. It is an operation | movement flowchart which shows the failure subnet test | inspection process of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 20 ... Wireless network, 21-27 ... Node, 30 ... Node, 31 ... Information processing part, 32 ... Information storage part, 33 ... Wireless communication part, 311 ... Network connection processing function part, 312 ... Fault subnet information notification function part, 313... Network leaving processing function unit 314 411 Node information collection processing function unit 315 Selection function unit 316 Failure detection function unit 412 Failure subnet inspection processing function unit

Claims (13)

In the wireless communication device provided in each of the nodes constituting the hierarchical wireless network,
Information communication means for performing information communication with other nodes;
Failure subnet information storage means for storing failure subnet information received from other nodes;
When the own node belongs to the failed subnet, the network leaving means to leave the subnet,
Node information collection means for collecting node information from one or more other surrounding nodes after leaving the subnet;
Connection request control means for suppressing connection requests to other nodes belonging to the subnet in which a failure has occurred based on the node information of the one or more other nodes and the failed subnet information;
A wireless communication apparatus comprising: a connection processing unit that performs a connection process with another node other than the other node suppressed by the connection request control unit.   The connection request control means selects another node other than the other node belonging to the subnet indicated by the failed subnet information based on the one or more node information, and makes a connection request to the selected other node. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is controlled.   A failure subnet information notifying means for notifying other node located in a lower layer of the own node of the failed node address information as the failed subnet information when a failed node is detected is provided. The wireless communication device according to 1 or 2.   4. The failure subnet information is also transmitted to another node when the node information collection means makes a node information collection request to one or more other nodes in the vicinity. A wireless communication device according to claim 1. In the wireless communication device provided in each of the nodes constituting the hierarchical wireless network,
Information communication means for performing information communication with other nodes;
Own node address information storage means for storing address information of the own node in the wireless network;
When a node information collection request is received from other neighboring nodes, the local node belongs to the subnet in which the failure occurred, based on the failed subnet information included in the node information collection request and the local node address information And a response request control means for suppressing a response to the node information collection request from the other node. In a wireless communication method performed by each of nodes constituting a hierarchical wireless network,
An information communication step in which the information notification means performs information communication with other nodes;
A fault subnet information storage means for storing fault subnet information received from another node;
When the network leaving means belongs to a subnet in which the own node has failed, a network leaving step for leaving the subnet,
A node information collecting step in which the node information collecting means collects node information from one or more other surrounding nodes after leaving the subnet;
A connection request control step in which a connection request control means suppresses a connection request to another node belonging to the subnet in which a failure has occurred, based on the node information of the one or more other nodes and the failed subnet information;
A wireless communication method, characterized in that the connection processing means includes a connection processing step of performing connection processing with another node other than the other nodes suppressed by the connection request control means. In a wireless communication method performed by each of nodes constituting a hierarchical wireless network,
An information communication step in which the information communication means performs information communication with other nodes;
The own node location information storage means stores the address information of the own node in the wireless network;
When the response request control means receives a node information collection request from other surrounding nodes, the own node has failed based on the failed subnet information and the own node address information included in the node information collection request. And a response request control step of suppressing a response to a node information collection request from the other node when belonging to a subnet. In a wireless communication program for causing each of the nodes constituting a hierarchical wireless network to function,
Computer
Information communication means for performing information communication with other nodes,
Fault subnet information storage means for storing fault subnet information received from other nodes,
When the node belongs to the failed subnet, the network leaving means to leave the subnet,
Node information collection means for collecting node information from one or more other surrounding nodes after leaving the subnet,
A connection request control means for suppressing connection requests to other nodes belonging to the subnet in which a failure has occurred based on the node information of the one or more other nodes and the failed subnet information;
A wireless communication program that functions as a connection processing means for performing a connection process with another node other than the other nodes suppressed by the connection request control means. In a wireless communication program for causing each of the nodes constituting a hierarchical wireless network to function,
Information communication means for performing information communication with other nodes,
Own node address information storage means for storing address information of the own node in the wireless network;
When a node information collection request is received from other neighboring nodes, the local node belongs to the subnet in which the failure occurred, based on the failed subnet information included in the node information collection request and the local node address information A wireless communication program that functions as a response request control unit that suppresses a response to a node information collection request from another node.   A node comprising the wireless communication device according to claim 1.   A node comprising the wireless communication apparatus according to claim 5. In a network repair system when a failure occurs in any of a plurality of nodes constituting a hierarchical wireless network,
Each said node is provided with the radio | wireless communication apparatus in any one of Claims 1-4, The network restoration | repair system characterized by the above-mentioned. In a network repair system when a failure occurs in any of a plurality of nodes constituting a hierarchical wireless network,
A network restoration system, wherein each of the nodes includes the wireless communication device according to claim 5.

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