JP2010177885A - Method and system for supporting wireless sensor node movement, group management node device, access gateway device, and position management server device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a load of communication about position registration of a position management server, with no addition of a new management function on the position management server side. <P>SOLUTION: A group management node 110 manages group information containing discrimination information on each wireless sensor node of a group in the group of moving wireless sensor nodes, and stops communication to an external network from a movement sensor network of the wireless sensor node depending on the moving condition. An MAG 103 receives group information of each group member from the group management node 110, and issues position registration requests collectively for all group members to an LMA 100. Upon receiving the position registration request for group members from the MAG 103, the LMA 100 executes a position registration process of radio sensor modes 111-11N of all group members. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless sensor node movement support method capable of IP communication, a wireless sensor node movement support system, a group management node device, an access gateway device, and a location management server device.

  In recent years, standardization of communication technologies for wireless sensor networks such as IEEE 802.15.4 and Zigbee has progressed, and the use of wireless sensor networks has expanded. Wireless sensor nodes are difficult to implement services linked to external networks such as the Internet due to severe restrictions on node resources and communication functions such as communication based on memory size, CPU performance, and sleep function. However, with the advancement of technologies such as the implementation of wireless sensor nodes and the performance improvement, optimization, and miniaturization of wireless communication functions, the development of technology that realizes cooperation with external networks by using wireless sensor networks as IP networks It is being advanced.

  For example, the 6lowpan group of the IETF (Internet Engineering Task Force) is developing and standardizing technology that realizes IPv6 network functions on top of the IEEE 802.15.4 protocol, such as factory automation and environmental monitoring. Application to services is expected. In the future, in order to expand the use to services that target mobile bodies such as medical care and logistics, it will be possible to continue communication of wireless sensor nodes when moving in a wide area across external networks. It is considered that technology for supporting movement of a wireless sensor node or a wireless sensor network is important.

  The ProxyMobileIP system (RFC 5213) standardized by IETF is an LMA (location management server: Local Mobility Anchor) that performs node location management across multiple networks and relays communication between other networks and nodes, and a network accessed by the node. Acts as a MAG (Mobile Access Gateway) that acts as a proxy for registering a node's location with the LMA and relays communication between the other network and the node, thereby suppressing the addition of functions related to mobility support to wireless sensor nodes This is a method that can suppress the processing load of the wireless sensor node, and is a promising method for the movement support of the wireless sensor node with a large resource constraint. However, since location registration communication occurs individually for each node, a plurality of wireless sensor nodes move in groups in a full-scale usage scene such as the distribution field or the medical field. Considering the situation that occurs in large quantities and at the same time, the concentration of location registration communication to the LMA may be a problem.

  Non-Patent Document 1 proposes a movement support system for a wireless sensor network based on the ProxyMobileIP system. In the non-patent document 1, in order to cope with movement support in a group, a NEMO (Network Mobility: RFC3963) system is used in a mobile gateway that relays a wireless sensor network and a broadband network such as IEEE802.3 or IEEE802.11. A method that combines the functions of a mobile router is proposed.

  In the NEMO system, location information of the mobile router and network information managed by the mobile router are managed with the home agent. It is considered that location registration of individual nodes managed by the mobile router is unnecessary, and the number of communications related to location registration immediately after movement can be suppressed.

  However, there is a problem that it is difficult to flexibly cope with a dynamic configuration change of the network such as group division or combination during movement. In addition, in this proposed method, it is necessary to provide two types of location management functions of the ProxyMobileIP method and the NEMO method, and when supporting the movement of a group, a mobile gateway including a mobile gateway that requires relatively high functionality and resources is required. There is also a problem that it is limited to.

  On the other hand, in Patent Document 1, assuming a use scene in a moving body such as a train, information on a group of mobile communication terminals in the moving body is provided in a function for managing the entire position information, and position registration during movement is performed. A method that can simplify the process is proposed. However, when applied to the ProxyMobileIP system, it is necessary to add a group information management function as a function in the LMA or in cooperation with the LMA. In the case of a system in which a large number of nodes are managed and controlled intensively, the addition of a management function on the LMA side increases the system cost. In addition, when a member change occurs due to group division or integration while the mobile body is moving, there is a problem that communication for changing member information of the group occurs even when the terminal is already known.

JP 2006-157957 A (page 42, FIG. 2)

Kenichi Yajima, et al., “Evaluation of Mobility Support Implementation in Sensor Networks”, IEICE Technical Report, vol. 107, no. 524, NS2007-166, pp. 199-204, March 2008

  As described above, in the movement support method of the wireless sensor network to which the ProxyMobileIP method is applied, when a large number of wireless sensor nodes move in a wide area, communication for position registration occurs for each wireless sensor node. There was a problem that the communication load of location registration was concentrated on the management server.

  The present invention has been made in view of such circumstances, and its purpose is to reduce the communication load related to location registration of the location management server without adding a new management function to the location management server. A wireless sensor node movement support method, a wireless sensor node movement support system, a group management node device, an access gateway device, and a location management server device are provided.

  In order to solve the above-described problem, the present invention provides a wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in units of groups. Requesting location registration processing for the plurality of wireless sensor nodes from the group management node that manages the plurality of wireless sensor nodes to the destination wireless sensor network, and receiving a request for the location registration processing, And a step of executing a location registration process for a plurality of wireless sensor nodes.

  In order to solve the above-described problems, the present invention provides a wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in units of groups, and the plurality of wireless sensor nodes are When the group management node to be managed detects the movement of the plurality of wireless sensor nodes between the wireless sensor networks, and the movement of the plurality of wireless sensor nodes between the wireless sensor networks is detected, the group management node A node requesting a location registration process for the plurality of wireless sensor nodes to an access gateway that manages a destination wireless sensor network; and the access gateway that has received the request for the location registration process includes: A location registration request to a wireless sensor node Transmitting to a location management server that performs location management, and the location management server that has received location registration requests for the plurality of wireless sensor nodes performing location registration processing for the plurality of wireless sensor nodes. This is a wireless sensor network movement support method.

  In order to solve the above-described problems, the present invention provides a wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in units of groups, and the plurality of wireless sensor nodes are When the group management node to be managed detects the movement of the plurality of wireless sensor nodes between the wireless sensor networks, and the movement of the plurality of wireless sensor nodes between the wireless sensor networks is detected, the group management node When the node stops communication of the plurality of wireless sensor nodes to the external network, and when the plurality of wireless sensor nodes are connected to the destination wireless sensor network, the group management node connects the destination network. For the access gateway to be managed, the plurality of wireless sensors Transmitting the group information related to the node and requesting the location registration process, and the access gateway that has received the request for the location registration process sends the group information to the location management server that manages the location of the wireless sensor node. And requesting location registration processing for the plurality of wireless sensor nodes, and when the location management server receives a location registration request for the plurality of wireless sensor nodes, location registration processing for the plurality of wireless sensor nodes. A wireless sensor node movement support method characterized by comprising:

  In order to solve the above-described problem, the present invention provides a wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in a group unit. A group management node that manages the plurality of wireless sensor nodes, and a position management server that manages position information of wireless sensor nodes that move between the wireless sensor networks, the group management node comprising: When moving between wireless sensor networks, the mobile station includes group location registration request means for transmitting location registration processing requests to the plurality of wireless sensor nodes to the destination wireless sensor network, and the location management server includes the group management node Location registration processing required for the plurality of wireless sensor nodes And a group position registration unit that executes a position registration process for the plurality of wireless sensor nodes, and a group position registration unit that executes a position registration process for the plurality of wireless sensor nodes. It is a movement support system of a sensor node.

  In order to solve the above-described problem, the present invention provides a wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in a group unit. A group management node that manages the plurality of wireless sensor nodes, an access gateway that manages access links of wireless sensor nodes under the wireless sensor network, and a wireless sensor node that moves between the wireless sensor networks. A position management server that manages position information, wherein the group management node detects movement of the plurality of wireless sensor nodes between wireless sensor networks, and movement between wireless sensor networks by the movement detection means. Is detected, the destination wireless sensor network Group information notifying means for notifying the access gateway that manages a group of group information related to the plurality of wireless sensor nodes, and when the access gateway receives the group information, the access gateway Group location registration processing request means for transmitting a group location registration request for the plurality of wireless sensor nodes based on the group information, and the location management server receives the group location registration request, A wireless sensor network movement support system comprising group location registration means for executing location registration processing for a wireless sensor node.

  In order to solve the above-described problem, the present invention provides a wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in a group unit. A group management node that manages the plurality of wireless sensor nodes, an access gateway that manages access links of wireless sensor nodes under the wireless sensor network, and a wireless sensor node that moves between the wireless sensor networks. A position management server that manages position information, wherein the group management node detects movement of the plurality of wireless sensor nodes between wireless sensor networks, and movement between wireless sensor networks by the movement detection means. Is detected, the plurality of wireless sensor nodes are detected. Communication stop requesting means for stopping communication with the external network and the plurality of wireless sensor nodes connected to the destination wireless sensor network, the plurality of wireless Group information notifying means for notifying group information related to sensor nodes, and when the access gateway receives the group information, the access gateway notifies the location management server of the plurality of wireless sensor nodes based on the group information. Group location registration processing requesting means for transmitting a group location registration request is provided, and the location management server comprises group location registration means for executing location registration processing for the plurality of wireless sensor nodes when receiving the group location registration request. The wireless sensor Node is a mobile support system.

  In order to solve the above-described problem, the present invention is a group management node device that is one of a plurality of wireless sensor nodes that can move between wireless sensor networks in groups, and manages the plurality of wireless sensor nodes. And a movement detecting means for detecting movement of the plurality of wireless sensor nodes between the wireless sensor networks, and when movement between the wireless sensor networks is detected by the movement detecting means, the outside of the plurality of wireless sensor nodes. Communication stop request means for stopping communication with a network, and when the plurality of wireless sensor nodes are connected to a destination wireless sensor network, the plurality of wireless sensor nodes are connected to an access gateway device that manages the destination network. Group information notifying means for notifying group information relating to the access information; Communication resumption means for resuming communication of the plurality of wireless sensor nodes to an external network upon receiving notification of completion of the position registration processing indicating that group position registration for the plurality of wireless sensor nodes has been completed from the tow device; A group management node device comprising:

  In order to solve the above-described problem, the present invention provides an access gateway device that manages access links of wireless sensor nodes under a wireless sensor network, and a plurality of wireless sensor nodes are connected between wireless sensor networks in groups. When group information related to the plurality of wireless sensor nodes is received from the group management node device that manages the plurality of wireless sensor nodes that has detected the movement, the position information of the wireless sensor nodes that move between the wireless sensor networks is managed. A group location registration processing requesting means for transmitting a group location registration request for the plurality of wireless sensor nodes based on the group information to the location management server device, and the location management server for the plurality of wireless sensor nodes. After the location registration process is completed, When the location registration processing execution result transmitted from the location management server device is received, the location information of the wireless sensor node in the access gateway is updated, and the location registration processing for notifying the group management node device of completion of the location registration processing An access gateway device comprising completion notification means.

  In order to solve the above-described problem, the present invention provides a location management server device that manages location information of a wireless sensor node that moves between wireless sensor networks, and includes an access link of a wireless sensor node under the wireless sensor network. When receiving a group location registration request for requesting location registration for the plurality of wireless sensor nodes based on group information regarding a plurality of wireless sensor nodes moved between wireless sensor networks in units of groups from the access gateway device managing Group location registration means for executing location registration processing for a plurality of wireless sensor nodes, and execution result return means for returning the execution result of location registration processing to the access gateway device when location registration processing for the plurality of wireless sensor nodes is completed. Special features A location management server device to.

  According to the present invention, there is an advantage that it is possible to reduce a communication load related to location registration in the location management server without adding a new management function on the location management server side.

It is a block diagram which shows the structure of the mobility support system of ProxyMobileIP system by embodiment of this invention. It is a sequence diagram for demonstrating operation | movement of the movement support system of ProxyMobileIP system by this embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a proxy mobile IP mobility support system according to an embodiment of the present invention. In the figure, the present mobility support system includes a wireless sensor network gateway 102, 104, a wireless sensor that relays between the LMA 100 and the MAG 101, 103, the wireless sensor network and the network in which the MAG 101, 103 exists, which constitutes a proxy mobile IP mobility support system. The network includes a group management node 110 and wireless sensor nodes 111 to 11N included in a movement sensor network to be moved in the network.

  The group management node 110 is one of wireless sensor nodes connected to the wireless sensor network. As a representative node, the MAC address on the network for identifying the wireless sensor nodes 111 to 11N of the group members of the mobile sensor network, etc. Has a function of managing the identification information. When the group moves between wireless sensor networks, the group management node 110 sends group information including a list of identification information of the wireless sensor nodes 111 to 11N of the group members to the MAGs 101 and 103 that manage the movement destination network. Notify and request location registration processing. Further, the wireless sensor nodes 111 to 11N of the group members are requested to switch to the moving mode until they move through the wireless sensor network and the location registration process of the group members is completed.

  The wireless sensor nodes 111 to 11N perform a direct or multi-hop wireless connection to the wireless sensor network gateways 102 and 104 and transmit sensor data to an external service server 120 or the like by an IP network communication function. Have Further, in the present embodiment, the wireless sensor nodes 111 to 11N stop communication with the external network of the mobile sensor network by a request for switching to the mobile mode from the group management node 110, and by a request to release the mobile mode, It also has a function of resuming communication with an external network.

  Note that the method of configuring a group of mobile sensor networks and the method of collecting group information at the group management node 110 are outside the scope of the present invention. For example, a method is also conceivable in which a group is configured by a star type or tree type network in which the group management node 110 is a relay node with an external network, and a node identification information collecting function is realized from relayed communication addresses or the like. . A method of grouping or collecting group information in cooperation with another system that performs group organization according to the physical arrangement of the wireless sensor nodes 111 to 11N is also conceivable.

  The MAGs 101 and 103 provide an access gateway function for managing an access link of a network in which movement is performed and a subordinate node, a function of transmitting a node location registration request to the LMA 100, and transmission / reception with a network outside the subordinate node It has a function to relay packets. In the present embodiment, the MAGs 101 and 103 also have a function of receiving group member group information from the group management node 110 and making a location registration request to the LMA 100 by grouping the group members.

  The LMA 100 provides a function of a position management server for nodes that move between networks, executes a position registration process for subordinate nodes, manages position information, and sends / receives packets to / from networks outside the subordinate nodes. Has a relay function. Further, in this embodiment, when the LMA 100 receives the position registration requests for the group members from the MAGs 101 and 103, the LMA 100 executes the position registration processing of the wireless sensor nodes 111 to 11N of all the group members, and collects the processing results together. It also has a function of returning to 103.

Next, the operation of this embodiment described above will be described.
FIG. 2 is a sequence diagram for explaining the operation of the proxy mobile IP type mobility support system according to this embodiment. FIG. 2 shows a wireless sensor network in which the group management node 110 and the mobile sensor network including N wireless sensor nodes 111 to 11N are subordinate to the MAG 103 in the configuration shown in FIG. The flow of processing when moving to is shown.

  When the movement sensor network moves from the subordinate of the MAG 101, the group management node 110 detects the movement (step S201). The method for detecting movement is outside the scope of the present invention. For example, the method for detecting disconnection of the wireless connection between the group management node 110 and the wireless sensor network gateway 102 or the means such as a button provided on the group management node 110 A method based on an input from an external system that detects movement due to an error may be considered.

  The group management node 110 that has detected the movement requests the wireless sensor nodes 111 to 11N of the group members to set the movement mode (step S202). The wireless sensor nodes 111 to 11N stop communication with the external network of the mobile sensor network when the group management node 110 requests to set the mobile mode.

  When the wireless sensor network moves and the group management node 110 completes wireless connection with the wireless sensor network gateway 104 (step S203), the group management node 110 transmits group information including identification information of the group members to the MAG 103. The position registration of the wireless sensor nodes 111 to 11N of the group members is requested (step S204).

  When the MAG 103 receives the group member group information and the location registration request from the group management node 110, the MAG 103 makes a location registration request for the group members to the LMA 100 (step S205).

  When the LMA 100 receives a location registration request that summarizes the group members from the MAG 103, the LMA 100 executes the location registration processing of the wireless sensor nodes 111 to 11N of all the group members in the same manner as when receiving the request individually (step S206). . When the location registration processing for all members is completed, a completion notification that summarizes information such as the home network prefixes of the group members is returned to the MAG 103 (step S207).

  Upon receiving the location registration processing completion notification, the MAG 103 updates the registration information of the node in the MAG 103, sets up a bidirectional tunnel with the LMA 100 as necessary (step S208), and sends it to the group management node 110. A notification of completion of the location registration process is transmitted to the terminal (step S209). The group management node 110 requests the group member wireless sensor nodes 111 to 11N to cancel the movement mode (step S210), and each of the wireless sensor nodes 111 to 11N resumes communication with a network outside the mobile sensor network. (Step S211).

  In the present embodiment, after communication with an external network of the mobile sensor network is resumed, even when communication used to trigger location registration for the LMA 100, such as a router request message, occurs from the wireless sensor nodes 111 to 11N to the MAG 103, By using the registration information in the MAG 103 to send a reply, it becomes possible to prevent location registration communication with the LMA 100 from occurring.

  Further, in the present embodiment, even when viewed from the above configuration and operation, it is only necessary to add a function of receiving location registration requests for group members from the MAGs 101 and 103 to the LMA 100 and returning the processing results together. There is no need to add new management functions.

  According to the above-described embodiment, when the wireless sensor nodes 111 to 11N move between the wireless sensor networks in units of groups, the wireless sensor nodes 111 to 11N in the group are requested by a request from the group management node 110 that is a representative node. When the location registration processing and communication of individual wireless sensor nodes can be omitted by collectively performing location registration processing for all, the group of wireless sensor nodes 111 to 11N moves between wireless sensor networks. In addition, it is possible to reduce the load of location registration communication with the LMA 100.

101, 103 MAG
102, 104 Wireless sensor network gateway 110 Group management node 111-11N Wireless sensor node 120 External service server, etc.

Claims (13)

A wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
Requesting location registration processing for the plurality of wireless sensor nodes from a group management node that manages the plurality of wireless sensor nodes to the destination wireless sensor network when moving between the wireless sensor networks;
Receiving a request for the location registration process, and executing a location registration process for the plurality of wireless sensor nodes. A wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
A group management node that manages the plurality of wireless sensor nodes detecting movement of the plurality of wireless sensor nodes between wireless sensor networks;
When movement of the plurality of wireless sensor nodes between the wireless sensor networks is detected, the group management node performs location registration processing for the plurality of wireless sensor nodes with respect to an access gateway that manages the wireless sensor network of the movement destination. Requesting, and
The access gateway that has received the request for location registration processing transmits a location registration request for the plurality of wireless sensor nodes to a location management server that performs location management of the wireless sensor nodes;
The location management server that has received location registration requests for the plurality of wireless sensor nodes executes a location registration process for the plurality of wireless sensor nodes. A wireless sensor network movement support method when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
A group management node that manages the plurality of wireless sensor nodes detects movement of the plurality of wireless sensor nodes between wireless sensor networks;
When the movement of the plurality of wireless sensor nodes between wireless sensor networks is detected, the group management node stops communication of the plurality of wireless sensor nodes to an external network;
When the plurality of wireless sensor nodes are connected to a destination wireless sensor network, the group management node transmits group information regarding the plurality of wireless sensor nodes to an access gateway that manages the destination network. Requesting location registration processing;
The access gateway that has received the request for location registration processing requests a location management server that performs location management of wireless sensor nodes based on the group information to perform location registration processing for the plurality of wireless sensor nodes. When,
When the location management server receives location registration requests for the plurality of wireless sensor nodes, the location management server includes a step of executing location registration processing for the plurality of wireless sensor nodes. When the location registration processing for the plurality of wireless sensor nodes is completed, the location management server returns the execution result of the location registration processing to the access gateway;
When the access gateway receives the execution result of the location registration process, the location information of the wireless sensor node in the access gateway is updated, and the group management node is notified of the completion of the location registration process;
The group management node further includes a step of resuming communication of the plurality of wireless sensor nodes to an external network when receiving notification of completion of location registration processing from the access gateway. The wireless sensor node movement support method described.   5. The wireless sensor node movement support method according to claim 3 or 4, wherein the group information includes identification information for identifying the plurality of wireless sensor nodes. A wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
A group management node that is one of the plurality of wireless sensor nodes and manages the plurality of wireless sensor nodes;
A location management server that manages location information of wireless sensor nodes that move between the wireless sensor networks,
The group management node is
Group location registration request means for transmitting location registration processing requests for the plurality of wireless sensor nodes to the destination wireless sensor network when moving between the wireless sensor networks,
The location management server
When receiving a location registration processing request for the plurality of wireless sensor nodes from the group management node, a group location registration unit that executes location registration processing for the plurality of wireless sensor nodes is provided.
A wireless sensor node movement support system. A wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
A group management node that is one of the plurality of wireless sensor nodes and manages the plurality of wireless sensor nodes;
An access gateway for managing access links of wireless sensor nodes under the wireless sensor network;
A location management server that manages location information of wireless sensor nodes that move between the wireless sensor networks,
The group management node is
A movement detecting means for detecting movement between the wireless sensor networks of the plurality of wireless sensor nodes;
Group information notifying means for notifying group information relating to the plurality of wireless sensor nodes to the access gateway that manages the wireless sensor network of the movement destination when movement between the wireless sensor networks is detected by the movement detecting means; With
The access gateway is
When receiving the group information, the location management server comprises a group location registration processing request means for transmitting a group location registration request for the plurality of wireless sensor nodes based on the group information,
The location management server
When receiving the group location registration request, a group location registration unit that executes location registration processing for the plurality of wireless sensor nodes is provided.
A wireless sensor network movement support system. A wireless sensor network movement support system when a plurality of wireless sensor nodes move between wireless sensor networks in groups,
A group management node that is one of the plurality of wireless sensor nodes and manages the plurality of wireless sensor nodes;
An access gateway for managing access links of wireless sensor nodes under the wireless sensor network;
A location management server that manages location information of wireless sensor nodes that move between the wireless sensor networks,
The group management node is
A movement detecting means for detecting movement between the wireless sensor networks of the plurality of wireless sensor nodes;
Communication stop requesting means for stopping communication of the plurality of wireless sensor nodes to an external network when movement between wireless sensor networks is detected by the movement detection means;
When the plurality of wireless sensor nodes are connected to a destination wireless sensor network, group information notifying means for notifying the access gateway that manages the destination network of group information related to the plurality of wireless sensor nodes is provided. ,
The access gateway is
When receiving the group information, the location management server comprises a group location registration processing request means for transmitting a group location registration request for the plurality of wireless sensor nodes based on the group information,
The location management server
When receiving the group location registration request, a group location registration unit that executes location registration processing for the plurality of wireless sensor nodes is provided.
A wireless sensor node movement support system. The location management server
When the location registration process for the plurality of wireless sensor nodes is completed, the system further comprises execution result return means for returning the execution result of the location registration process to the access gateway.
The access gateway is
When the execution result of the location registration process is received, the location information of the wireless sensor node in the access gateway is updated, and further provided is a location registration process completion notification means for notifying the group management node of the completion of the location registration process,
The group management node is
A communication resumption means for resuming communication of the plurality of wireless sensor nodes to an external network upon receiving notification of completion of the location registration process from the access gateway;
The wireless sensor node movement support system according to claim 8.   The wireless sensor node movement support system according to any one of claims 7 to 9, wherein the group information includes identification information for identifying the plurality of wireless sensor nodes. A group management node device that is one of a plurality of wireless sensor nodes that can move between wireless sensor networks in units of groups, and that manages the plurality of wireless sensor nodes,
A movement detecting means for detecting movement between the wireless sensor networks of the plurality of wireless sensor nodes;
Communication stop requesting means for stopping communication of the plurality of wireless sensor nodes to an external network when movement between the wireless sensor networks is detected by the movement detection means;
When the plurality of wireless sensor nodes are connected to a destination wireless sensor network, group information notification means for notifying group information regarding the plurality of wireless sensor nodes to an access gateway device that manages the destination network;
Communication resuming means for resuming communication of the plurality of wireless sensor nodes to an external network upon receiving notification of completion of position registration processing indicating completion of group position registration for the plurality of wireless sensor nodes from the access gateway device And a group management node device comprising: An access gateway device for managing an access link of a wireless sensor node under a wireless sensor network,
When receiving group information regarding the plurality of wireless sensor nodes from a group management node device that manages the plurality of wireless sensor nodes that detects that the plurality of wireless sensor nodes have moved between wireless sensor networks in units of groups, Group location registration processing request means for transmitting a group location registration request for the plurality of wireless sensor nodes based on the group information to a location management server device that manages location information of wireless sensor nodes that move between sensor networks. When,
When the location management server receives the execution result of the location registration process transmitted from the location management server device after the location registration processing for the plurality of wireless sensor nodes is completed, the location information of the wireless sensor node in the access gateway And a location registration processing completion notifying means for notifying the group management node device of completion of the location registration processing. A location management server device that manages location information of wireless sensor nodes that move between wireless sensor networks,
Location registration for the plurality of wireless sensor nodes is performed based on group information regarding a plurality of wireless sensor nodes that have moved between wireless sensor networks in units of groups from an access gateway device that manages access links of wireless sensor nodes under the wireless sensor network. When receiving a request for group location registration, group location registration means for executing location registration processing for the plurality of wireless sensor nodes;
When the location registration processing for the plurality of wireless sensor nodes is completed, the location management server device comprises execution result return means for returning the execution result of the location registration processing to the access gateway device.

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