KR101162338B1 - sensor node identification method for hierarchical sensor network and component therefor - Google Patents

Abstract

Provided are a method for a component constituting a hierarchical sensor network to identify a sensor node, and a component therefor. In a hierarchical sensor network, a method of identifying a sensor node by a first component of a first layer includes receiving a sensing request including sensor node identification information from a second component of a second layer before the first layer; Modifying the sensor node identification information by removing the identifier of the first layer from the sensor node identification information if the identifier of the first layer of the sensor node identification information matches the identifier of the first component and the modified sensor And sending a sensing request including node identification information to a third component of a third layer after the first layer. When the first component is a service provider, the second component is a client, and the third component is a gateway, the sensor node identification information is made by combining a service provider identifier, a gateway identifier and a sensor node identifier.

Sensor node, SPID, GWID, SNID

Description

Sensor node identification method for hierarchical sensor network and component therefor}

An embodiment of the present invention relates to a method for identifying a sensor node by a component constituting a hierarchical sensor network, and a component therefor.

The present invention is derived from the research conducted as part of the information communication standard development support project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunication Research and Development. [Task management number: 2008-P1-06-07I91, Project name: USN networking and application technology standard development] (Hierarchical identification scheme for sensor node).

Sensor network is a foundation network for realizing ubiquitous environment, and various research and development is being carried out at home and abroad. Data collected through sensors in the sensor network environment can be utilized in various USN (Ubiquitous Sensor Network) service areas through systematic analysis and interconnection between services.

However, since different services are developed using different protocols and communication technologies, mutual information sharing is difficult. In addition, the MAC (Internet Access Control), IP (Internet Protocol) or randomly assigned addresses used within the existing sensor network are addresses for communication only and do not provide the function of identification for managing each node, network and service. I can't.

Accordingly, in order to develop into a USN in a wide area in a sensor network environment, a standardized identification system for identifying configuration nodes, networks, and services among heterogeneous USN services, and searching and managing collected information is required. The identification system referred to herein is a unique identifier assigned to the USN to distinguish various physical entities, networks, service types, and the like, and includes object management, information required for location determination and access, and service management methods for interworking.

Conventional sensor node identifiers are designed to be uniquely identified globally, or are defined and used to be uniquely identified only within a particular sensor network. However, when designing as a unique identifier globally, the length of the identifier increases, which causes a burden on the sensor network mainly composed of low-performance devices, and when defined to be uniquely identified only in a specific sensor network, heterogeneous sensors There is a problem of incompatibility between networks.

The embodiment of the present invention is proposed to solve the above problems, and the method of identifying the components of the sensor network hierarchically and combining the component identifiers of each layer to uniquely distinguish the desired sensor node in each layer and its implementation. To provide a component to do this.

One aspect of the present invention for achieving the above object relates to a method for a first component of a first layer to identify a sensor node in a hierarchical sensor network, the method comprising: from a second component of a second layer before the first layer; Receiving a sensing request including sensor node identification information; and if the identifier of the first layer of the sensor node identification information matches the identifier of the first component, the identifier of the first layer is determined from the sensor node identification information. Removing and modifying the sensor node identification information and transmitting a sensing request including the modified sensor node identification information to a third component of a third layer after the first layer.

In this case, the first component includes at least one of a client, a service provider, and a gateway.

Here, when the first component is a service provider, the second component is a client, and the third component is a gateway, the sensor node identification information includes information combining a service provider identifier, a gateway identifier, and a sensor node identifier. .

In addition, when the first component is a gateway, the second component is a service provider, and the third component is a sensor node, the sensor node identification information includes information combining a gateway identifier and a sensor node identifier.

Another aspect of the present invention relates to a component for identifying a first sensor node of a first layer in a hierarchical sensor network, the method comprising receiving a sensing request including sensor node identification information from a second component of the layer before the first layer Identification information for correcting the sensor node identification information by removing the identifier of the first layer from the sensor node identification information when the identifier of the first layer of the sensor node identification information matches the identifier of the first component. And a transmitter for transmitting a sensing request including the analyzer and the modified sensor node identification information to a third component of a third layer after the first layer.

In this case, the first component includes at least one of a client and a gateway, when the first component is a gateway, the second component is a client, and the third component is a sensor node, the sensor node identification information is a gateway. This is done by combining an identifier and a sensor node identifier.

According to an embodiment of the present invention, since identification information for uniquely identifying a desired sensor node can be variably configured according to each layer of the sensing service network, data for the actual sensor network can be provided while providing a worldwide identification system. Do not burden the amount.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. Also, the terms " part, "" module," and " module ", etc. in the specification mean a unit for processing at least one function or operation and may be implemented by hardware or software or a combination of hardware and software have.

Throughout the specification, a sensing service network is a broad network that includes a sensing requester, a sensing service provider, and a sensing information provider, and a sensor network refers to a consensus network of the sensing information provider (s).

1A and 1B illustrate a structure of a sensing service network to which an embodiment of the present invention is applied.

In FIG. 1A, the sensing service network includes components of a client 110, a service provider 120, a gateway 130, and a sensor node 140, which is optional. As a result, a service portal 150 may be further included.

The client 110 is also called an issuing agent and transmits a sensing request to the service provider 120. The client 110 may search its own database to find a service provider 120 to provide a sensing service desired by the client 110, but may search using an external resource such as a service portal.

The service portal 150 has a user interface and / or an authentication process that is easy for the client 110 to access, and when a search request is received from the client 110, the service portal 150 searches for a service provider 130 that provides the corresponding sensing service and searches for the client ( 110).

When the service provider 120 receives the sensing request from the client 110, the service provider 120 searches for the sensor node 140 to provide sensing information corresponding to the sensing request, and transmits the sensing request including the identification information of the detected sensor node to the gateway ( 130). In addition, when sensing information about the sensing request is received through the gateway 130, the sensing information is provided to the corresponding client 110. The service provider 120 may commercialize and provide the sensing information in a form that is easily accessible to the user through a predetermined analysis and / or editing process.

When the sensing request is received from the service provider 120, the gateway 130 transmits the received sensing request to the sensor node 140 of the sensor network. When sensing information regarding the sensing request is received from one or more sensor node (s) 140, the sensing information is collected.

In addition, the gateway 130 serves as a relay for interworking the sensor network with an external network. For example, when the external network connected to the service provider 120 is an IP-based Internet, the gateway 130 converts protocols between the sensor network and the Internet. Here, the conversion of the protocol includes the conversion of the MAC / PHY protocol as well as the conversion between the Internet protocol and the sensor network protocol.

The sensor node 140, also called a sensor tag, detects recognition information such as shape and color of an object or environmental information such as temperature, humidity, and pollution level according to a sensing request, and transmits the detected information to a gateway ( 130).

Next, FIG. 1B illustrates another example of a sensing service network, in which the sensing service network includes components of a client 210, a gateway 220, and a sensor node 230. The service portal 240 may further be included.

The client 210, also called an issuing agent, requests sensing information from the gateway 220 or the sensor node 230. The client 210 may search its own database to find the sensor node 230 to provide the sensing information desired by the client 210. However, the client 210 may search using a separate external resource. As an example of an external resource, the service portal 240 has a user interface and / or authentication process that is easy for the client 210 to access, and the sensor node 230 that provides the corresponding sensing information when there is a search request from the client 210. ) And provide the identification information to the client 210.

When the sensing request is received from the client 210, the gateway 220 transmits the received sensing request to the sensor node 230 of the sensor network. When sensing information regarding the sensing request is received from one or more sensor node (s) 230, the sensing information is collected and the collected sensing information is provided to the corresponding client 210. To this end, the gateway 200 basically plays a relay role for interfacing the sensor network with an external network.

The sensor node 230 is also called a sensor tag, and detects recognition information or environment information of a thing according to a sensing request of the gateway 220 or the client 210, and detects the detected information. 210).

As described above with reference to FIGS. 1A and 1B, the clients 110 and 210 are connected to the service provider 120 to receive sensing information, or when the service provider opens the sensor network, the gateway 220 or the sensor node 230. ) Directly to obtain the sensing information. In this case, in order for the gateway or the client to request specific sensing information by designating a specific sensor node, unique identification information for identifying the corresponding sensor node is required.

In this case, the identification information of the sensor node should be able to uniquely identify the sensor node in the global environment and should be designed as small as possible because it is used in a low-performance sensor network unlike the existing wired Internet environment.

If a sensor node is uniquely identified at the gateway layer, then there is no problem in communication between a particular gateway and the sensor node, and if a sensor node is uniquely identified at the service provider layer, then no communication between any gateway and any sensor node belonging to the lower layer is required. There will be no problem. Embodiments of the present invention, based on this fact, suggest the following sensor node identification scheme.

2 is a block diagram of a sensor network for each layer for explaining a sensor node identification scheme according to an embodiment of the present invention.

In FIG. 2, the sensor network for each layer is divided into a client layer, a service provider layer, a gateway layer, and a sensor node layer. An identifier of the client layer is an issuing agent code (IAC), and an identifier of a service provider layer is a service provider ID (SPID). The identifier of the gateway layer is referred to as a gateway ID (GWID), and the identifier of the sensor node layer is referred to as a sensor node ID (SNID).

In order to hierarchically manage the sensor node identification system according to an embodiment of the present invention, the IAC may be assigned to an identification system management agency representing each country or to a neutral identification system management organization other than the country.

The SPID is used to identify the service provider that provides the sensing service, and the IAC can perform the allocation and management.

The GWID is used to identify each gateway operated by the service provider, and the service provider may perform assignment and management.

The SNID is used to identify each sensor node inside a specific gateway, and the service provider can perform assignment and management. In addition, depending on the sensor network, the gateway may automatically assign an SNID.

According to the sensor node identification scheme, a specific gateway of the gateway layer may identify each sensor node managed by the SNID, a specific service provider of the service layer may identify each gateway by a GWID, and specific of the client layer. The client can identify each service provider to which it can connect by the SPID.

This will be described below with specific examples.

In order to uniquely identify the sensor node for each layer, it is necessary to variably configure the identification information of the sensor node for each layer. That is, sensor node identification information is defined as SNID in the gateway layer, 'GWID + SNID' in the service provider layer, and 'IAC + SPID + GWID + SNID' in the global layer for the global use of sensor nodes.

As a special case when the sensor network is connected to the Internet through two or more gateways, the sensor node may have two or more identifiers at the service provider layer and the gateway layer. In this case, each service provider and gateway must be uniquely identified worldwide, so the global layer's SPID is defined as 'IAC + SPID' and the global layer's GWID is defined as 'IAC + SPID + GWID'. Therefore, the SPID and GWID of the sensor node identification information for each layer described above should be replaced with the SPID of the global layer and the GWID of the global layer, respectively.

In summary, the gateway level SNID of the gateway layer is used to uniquely identify a specific sensor node within a specific gateway, and the service node level SNID of the service provider layer is used to identify a specific service provider. It is used to uniquely identify a specific sensor node internally, and global sensor node identification information (Global SNID) is used to uniquely identify a specific sensor node in a global environment.

In addition, the global gateway identifier (Global GWID) is used to uniquely identify a specific gateway in the global environment, the global service provider identifier (Global SPID) is used to uniquely identify a specific service provider in the global environment.

A process of sensing service using the identification method of the sensor node described above will now be described.

3 is a flowchart illustrating a sensor node identification method according to an embodiment of the present invention.

The client uses the service portal or its own database to search for sensor nodes that will provide the desired sensing service. The sensor node identification information obtained as a result of the search includes each component identifier of the sensing service network that must pass to access the target sensor node. That is, the retrieved sensor node identification information is a structure in which a service provider identifier (SPID), a gateway identifier (GWID), and a sensor node identifier (SNID) are combined, and the client transmits a sensing request including the sensor node identification information to the service provider. (S101).

The service provider removes an identifier (SPID) indicating itself from the sensor node identification information included in the sensing request, and then transmits a sensing request including the modified sensor node identification information to the gateway (S102).

In detail, when a sensing request is received from the client (S102-1), the service provider compares the identifier (SPID) of the service provider included in the request sensor node identification information with its identifier. If they are different, they are sent to the wrong service provider, and according to a predetermined rule, the sensing request is discarded as it is or transmitted to other service providers in the vicinity. If both are the same, they are transmitted to the correct service provider, and the service provider removes the service provider identifier (SPID) from the sensor node identification information included in the service request (S102-2), and forwards the service request to the gateway. (S102-3).

The gateway removes an identifier (GWID) indicating itself from the sensor node identification information included in the sensing request, and then transmits a sensing request including the modified sensor node identification information to the sensor node (S103). At this time, when receiving a sensing service request from the service provider, the sensing request including the modified identification information is transmitted to the sensor node according to the sensor network protocol.

Specifically, when the sensing request is received from the service provider, the gateway compares the gateway identifier (GWID) included in the request sensor node identification information with its identifier. If they are different, they are sent to the wrong gateway, and according to a predetermined rule, the sensing request is discarded or forwarded to other nearby gateways. If they are the same, the gateway is transmitted to the correct gateway, and the gateway removes the gateway identifier (GWID) from the sensor node identification information included in the service request, and then transmits the service request to the sensor node.

When the sensor node receives a sensing request from the gateway, the sensor node compares the sensor node identifier (SNID) included in the requested sensor node identification information with its identifier. If the two are different, they are sent to the wrong sensor node. Therefore, the sensing request is discarded as it is or according to a predetermined rule, or transferred to other sensor nodes around. If both are the same, since the data is transmitted to the correct sensor node, the sensor node collects sensing information according to the content of the corresponding service request (S104).

The collected sensing information is transmitted to the client through the gateway and the service provider again (S105).

If the service provider opens the sensor network so that the client can directly access the gateway or sensor node, step S102 or step S103 may be omitted. In this case, the sensing request transmitted by the client to the gateway or sensor node includes 'GWID + SNID' or 'SNID' as sensor node identification information, respectively.

Next, the component structure of the sensing service network for identifying the sensor node according to an embodiment of the present invention. 4 is a block diagram showing the structure of a component according to an embodiment of the present invention.

The component of the sensing service network refers to a service provider or a gateway, and the sensing service network is divided into a client layer, a service provider layer, a gateway layer, and a sensor node layer. Hereinafter, a service provider will be described as an example of a component, but a person skilled in the art can easily infer the configuration of a gateway through this description.

The service provider 400 according to the exemplary embodiment of the present invention includes a receiver 410, an identification information manipulation unit 420, and a transmitter 430.

The receiver 410 receives a sensing request from a specific client of the client layer.

The identification information analyzer 420 compares the service provider identifier included in the sensor node identification information of the sensing request with its own identifier. If the identification information analyzer 420 is identical to each other, the identification information analyzer 420 removes the identifier from the sensor node identification information and then corrects the modified identifier. The sensing request is transmitted to the transmitter 430. If the two are not identical to each other, the sensing request is transmitted to the transmitter 430.

The transmitter 430 forwards the modified sensing request from the identification information analyzer 420 to the gateway layer. On the other hand, when the unmodified sensing request is transmitted, the sensing request is forwarded to another service provider of the same layer (service provider layer) or discarded without additional forwarding according to network rules.

The embodiments of the present invention described above are not implemented only through the apparatus and the method, but may be implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention or a recording medium on which the program is recorded. The implementation can be easily implemented from the description of the above-described embodiments.

In addition, although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of the invention.

1A and 1B illustrate a structure of a sensing service network to which an embodiment of the present invention is applied.

2 is a block diagram of a sensor network for each layer for explaining a sensor node identification scheme according to an embodiment of the present invention.

3 is a flowchart illustrating a sensor node identification method according to an embodiment of the present invention.

4 is a block diagram showing the structure of a component according to an embodiment of the present invention.

Claims (7)

1. A method in which a first component of a first layer identifies a sensor node in a hierarchical sensor network, the method comprising: Receiving a sensing request including sensor node identification information from a second component of a second layer before the first layer; Modifying the sensor node identification information by removing the identifier of the first layer from the sensor node identification information if the identifier of the first layer of the sensor node identification information matches the identifier of the first component; And Transmitting a sensing request including the modified sensor node identification information to a third component of a third layer after the first layer Sensor node identification method comprising a. The method of claim 1, The first component Sensor node identification method comprising at least one of a client, a service provider and a gateway. 3. The method of claim 2, If the first component is a service provider, the second component is a client, and the third component is a gateway, The sensor node identification information includes information combining a service provider identifier, a gateway identifier, and a sensor node identifier. 3. The method of claim 2, If the first component is a gateway, the second component is a service provider, and the third component is a sensor node, And the sensor node identification information includes information combining a gateway identifier and a sensor node identifier. A component for identifying a first sensor node of a first layer in a hierarchical sensor network, A receiver configured to receive a sensing request including sensor node identification information from a second component of the first layer before the first layer; An identification information analyzer configured to modify the sensor node identification information by removing the identifier of the first layer from the sensor node identification information when the identifier of the first layer of the sensor node identification information matches the identifier of the first component; And Transmitter for transmitting the sensing request containing the modified sensor node identification information to the third component of the third layer after the first layer Component of a hierarchical sensor network comprising a. The method of claim 5, The first component Component of a hierarchical sensor network comprising at least one of a client and a gateway. The method of claim 6, If the first component is a gateway, the second component is a client, and the third component is a sensor node, And the sensor node identification information is made by combining a gateway identifier and a sensor node identifier.

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