KR20090049757A - Sensor system based on ubiquitous sensor network - Google Patents

Abstract

The present invention relates to a USN based sensor system. According to the present invention, a sensor node for sensing information for at least one of environmental hazardous substance detection, fire detection, and distance separation detection, and management and control of the sensor node, collect the sensed data through a predetermined network Including a transmitting gateway, the sensor node and the gateway is equipped with middleware for performing at least one of control, status check, management, monitoring and maintenance of the sensor node. According to the present invention, there is an advantage in that the sensor node can be integratedly managed.

Sensor, USN, Gateway, In-Network, Middleware, Server, IP Based

Description

Sensor System based on Ubiquitous Sensor Network}

 The present invention relates to a USN-based sensor system, and more particularly, to a method and a system capable of integrated management of a sensor node performing a detection according to a predetermined purpose.

 The country aims to realize the future intelligent foundation society (U-Korea) by establishing the world's best USN. Until 2007, the nation will complete the foundation for USN construction and develop technologies and services that can be used in full scale. It is trying to promote 7% market share and convergence with BN, NT and other industries.

Sensor technology has been a core element of the information wave, and R & D activities have been carried out in major developed countries such as the United States and Japan, and recently, as it is emerging as a core technology for U-sensor network, research as a part of next-generation core industry promotion policy in the world Development is currently in progress.

As part of the IT 839 strategy being pursued by the Ministry of Information and Communication, the ultimate goal is to embed computing, sensing, and communication functions in all things, and to detect information from the external environment and to connect, manage, and control the network in real time. As it is expected to be accompanied by the exponential growth of the sensor market when the initial implementation stage or U-sense network industry is in full swing, ubiquitous sensors that detect environmental factors such as pressure, temperature, humidity, and brightness are recently In order to connect with the sensor, more active development of the sensor network as well as the sensor is needed.

Although sensor networks are expected to be difficult to apply to all applications with a single specification as they can be applied to various potential applications, efforts to operate a scalable sensor network connected to an external network need more investment. .

Such a sensor network can be applied to various fields using a short range communication method. In particular, it can be applied to the prevention of theft or loss of goods through the detection of environmental hazards, fire detection, and distance separation.

However, according to the prior art, the detection technology through the sensor node applied to the field has been actively developed, but the development of a system for managing it integrally is insufficient.

In the present invention, in order to solve the problems of the prior art as described above, it is proposed a USN-based sensor system that can integrally manage each sensor rigor.

According to a preferred embodiment of the present invention to achieve the above object, USN-based sensor system, comprising: a sensor node for sensing information for at least one of environmentally hazardous material detection, fire detection and distance separation detection; And a gateway configured to manage and control the sensor node and collect and transmit the sensed data through a predetermined network, wherein the sensor node and the gateway control, status check, manage, monitor and maintain the sensor node. A USN based sensor system is provided that is equipped with middleware to perform at least one of the repairs.

According to the present invention, there is an advantage in that the sensor nodes distributed in each site can be integratedly managed.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In describing the drawings, similar reference numerals are used for similar elements.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms such as those defined in the commonly used dictionaries should be construed as having meanings consistent with the meanings in the context of the related art, and, unless expressly defined in this application, are construed in ideal or excessively formal meanings. It doesn't work.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, the same reference numerals will be used for the same means regardless of the reference numerals in order to facilitate the overall understanding.

1 is a view showing the configuration of a sensor system according to the present invention.

As shown in FIG. 1, a USN-based sensor system according to the present invention includes a wireless sensor network including a sensor node 100, a sink node 102, a gateway 104, and the above-described sensor network. It may include a management system 110 connected to the "WSN" and the IP-based network (for example, the Internet).

Here, the sensor node 100 may include one or more, and delivers information detected in the environment, the physical system, or a specific event related to the sensor based on wired or wireless communication technology or performs computing.

The sensor node 100 is composed of a processor, a communication device, and a battery to perform processes such as data processing and communication path setting.

In the present invention, the sensor node 100 may be configured as a composite sensor in the case of detecting a complex element such as temperature, humidity, CO2 for environmental hazardous substance monitoring, fire monitoring. However, the present invention is not limited thereto, but the transmitting device and the receiving device are separately configured to detect the distance separation, and when the receiving device calculates the separation distance or the separation distance more than a predetermined distance through the strength of the signal transmitted from the transmitting device, it uses a single sensor. It will be understood by those skilled in the art that they can be constructed.

The sink node 102 collects data sensed by the sensor node 100 or enables eventual data to be linked with the outside.

The gateway 104 performs a function of associating the WSN with the IP-based network to provide USN services through various networks (LAN, WLAN, CDMA, Wibro, Satellite, etc.) that can be accessed based on IP (Internet Protocol). do. Although FIG. 1 illustrates that the gateway 104 and the sink node 102 are provided independently, the sink node 102 may be implemented in the gateway 104 in some cases.

Meanwhile, the WSN may be connected to the IP-based management system 110 through the gateway 104.

Management system 110 according to the present invention may include a USN middleware, USN applications.

The USN middleware may include server side middleware for linking with an application service. However, the USN middleware may include in-network middleware for managing the sensor node 100 without being limited thereto.

Server-side middleware performs the function of filtering / integrating / analyzing sensing data collected from heterogeneous WSNs, and extracts, stores, manages, and retrieves meaningful information. In addition, it can perform the delivery to the application service and the linkage / integration function between services.

Meanwhile, the in-network middleware is mounted on the sensor node 100 and the sink node 102 and exists between various sensor application software, an operating system, and a network function. The in-network middleware is provided with various matters required for maintenance, installation / deployment, and application execution. Support.

In addition, program update of WSN, program adjustment according to application change, database (sensor DB) for sensing data measured at sensor node 100 and sink node 102, data storage management, data operation and processing suitable for various applications Perform the (Data Fusion) function.

The required functions of the in-network middleware are shown in [Table 1].

division main function Power management Processing and hardware management reflecting sensor node low power characteristics Location awareness Location-based information provision and node information grasping for location-based service provision Time synchronization Time synchronization for accurate collaboration between sensor nodes Software distribution and automatic renewal Correction and addition of functionality for mobile or geographically distributed sensor nodes Sensing Information Storage and Management Efficient generation, transfer, storage and management of sensing data measured by sensors Data distribution and replication Improves data accessibility and minimizes energy consumption by transmitting redundant data by storing sensed data and common data in optimal locations Sensor Node and Network Security Middleware-level security to prevent untrusted code from running on sensor nodes Fault Management Failover capability for stable operation in a reliable, low availability environment Sensor node, network naming Identification scheme for effective classification and management of numerous sensor nodes Link with Existing Network Interworking with IP networks and non-IP sensor networks

Required Features of In-Network Middleware

On the other hand, USN applications are designed with profiles for specific services and applications based on the built USN middleware.

In the present invention, to detect environmental hazardous substances, fire monitoring and distance separation, the USN application performs a profile creation and management function for data and events input from each sensor node 100.

Hereinafter, each configuration of the sensor system according to the present invention will be described in detail.

2 is a block diagram of a sensor node 100 in accordance with the present invention.

As shown in FIG. 2, the sensor node 100 according to the present invention may include a controller 200 and an RF module 210.

The controller 200 may include a software platform 202 and a transceiver interface 204 and is connected to one or more sensor units 206.

According to the present invention, the software platform 202 may include an operating system and in-network middleware.

The operating system of the controller 200 may support low power communication, efficient management of processor memory, time synchronization of sensor nodes, multi-hop, and mesh networks.

Preferably, the control unit 200 according to the present invention may be applied to the Tiny OS of the Berkeley University or Nano-QPlus of ETRI.

In addition, according to the present invention, as shown in FIG. 3, a compact abstraction layer 300 may be added to the in-network middleware to support multiple operating systems.

4 is a diagram illustrating the function of the in-network middleware according to the present invention.

Referring to FIG. 4, the middleware mounted on the gateway includes a plurality of components.

The sensor node maintenance component 400 performs the maintenance of the gateway software and the maintenance of the sensor node network.

The in-network query processing component 402 performs a function of managing queries to be efficiently processed between the plurality of sensor nodes 100 when in-network query processing is possible. By performing in-network query processing, the amount of large sense data transmitted from the sensor nodes 100 can be filtered.

The sensor node control management component 404 is capable of applying control commands such as “pause”, “resume”, “end” to in-network query processing performed at the gateway 104 and the sensor node 100. Do this.

The sensor node monitoring management component 406 monitors real-time state information such as the remaining power of the sensor node 100, the operating state of the sensor node, and whether the sensor node is connected.

Through this, it may be determined whether the sensor node 100 is lost.

The sensor node network routing management component 408 provides the functionality to support a multi-hop routing scheme that connects from the gateway 104 to all sensor nodes 100.

On the other hand, the middleware mounted on the sensor node 100 includes a plurality of modules for performing substantial functions.

The in-network query processing module 410 performs a query processing operation at the sensor node 100. In this case, the server may be processed in the server side middleware for error checking and optimizing the query.

The sensor node control module 412 may control a query being processed by the sensor node 100, and the sensor node status check module 414 may perform status information monitoring of the sensor node.

The sensor node maintenance module 416 performs software maintenance and error processing of the sensor node 100.

In the state in which the in-network middleware is mounted, the sensor node 100 may perform a sensing data collection transmission process for detecting an application service, that is, an environmental hazardous material alarm, fire monitoring, and distance separation.

For example, in case of an environmental hazardous substance alarm, the sensor unit 206 may be provided with means for sensing fine dust, CO 2, CO, VOC, temperature, and humidity, and in case of fire monitoring, temperature, CO 2, and flame may be provided. Means for detecting may be provided.

On the other hand, in the case of distance separation detection, the sensor unit 206 may include means for receiving a signal transmitted from a transmission device attached to a predetermined object or person.

When the wireless signal is received, the controller 200 analyzes the strength of the received signal to determine whether the object or person is separated from the sensor node 100 by more than a predetermined distance (for example, 3 m or more) or how far the current separation distance is. Can be calculated.

The calculation of the spaced distance may be performed by converting the received signal into a voltage and comparing it with a reference voltage, and it will be apparent to those skilled in the art that various methods may be applied.

Sensing data or event data detected by the sensor node 100 is transmitted to the RF module 210 through the transceiver interface 204.

The transceiver interface 204 transfers the sensing data to the RF module 210 through a network stack and a media access control (MAC).

According to the present invention, the RF module 210 is implemented in the form of a SoC or a single chip based on IEEE 802.15.4 and ZigBee (Zigbee), and can be implemented in a single chip with the control unit 200 for miniaturization and low power. have.

ZigBee uses dual PHYs and uses 2.4GHz and 868 / 915MHz frequency bands, direct sequence spread spectrum (DS-SS), and data rates of 20-250kbps.

On the other hand, Figure 5 is a view showing a simplified configuration of the gateway according to the present invention, Figure 6 is a view showing a detailed configuration of the gateway according to the present invention.

As shown in FIG. 5, the gateway 104 may include a sink node 102 and may be equipped with a 32-bit low power high performance controller and an external mass memory for smooth communication between the IP based network and the WSN. .

As illustrated in FIG. 6, the gateway 104 according to the present invention includes an RF transceiver 600 for a sink node function, a controller 602 for providing a gateway function and a middleware function, and a memory (SRAM). , Flash, 604, and MAC / transceivers 606 through 610 for connection to an IP-based network.

Preferably, each MAC / transceiver for IP-based network access can be designed to be easy to add and remove.

The RF transceiver 600 performs a function of receiving data and events from the sensor node 100, and the controller 602 provides a function corresponding to the in-network middleware.

The memory 604 manages execution of software and storage of data.

In addition, the LAN MAC / transceiver 606 is an interfacing function for connection with a LAN (Loca Area Network), the WLAN MAC / transceiver 608 is an interfacing function for connection with a wireless LAN (WLAN), and a CDMA MAC / transceiver 610. ) Performs an interfacing function for connection with a CDMA network.

Meanwhile, the software platform of the gateway according to the present invention may include an operating system (OS), a protocol stack, and in-middleware.

The operating system of the gateway may be an open source embedded Linux and other commercial Real Time Operating System (RTOS). Here, the RTOS may include Nucleus, VxWorks, pSOS, and the like.

The protocol stack of the gateway may be applied to the USN overlay Internet model format, as shown in FIG. 7, for connection between the sensor node and the IP-based network.

On the other hand, the sensor system according to the present invention, as shown in Figs. 8 and 9, the application service for setting the application service manager 800 and the application service manager of the USN middleware for use in various specific application services Provide a profile creator 900.

Among the server-side middleware, the application service manager receives an application service profile and allocates and sets USN resources necessary for a specific application service.

Here, the application service profile is information on whether the sensor system is applied to detecting environmentally harmful substances, fire detection or distance separation.

Referring to FIG. 8, the application service manager 800 manages connection management with front-end software of a specific application service, query processing, situation recognition processing, and control of a WSN according to each profile.

The query processing module 802 processes and filters a query for the WSN according to the profile set by the application service manager.

The situation recognition processing module 804 performs a warning on a preset dangerous situation and corresponding processing based on a profile rule suitable for each application service.

The control processing module 806 controls the WSN, the external network, and the database according to a profile suitable for each application service.

Meanwhile, referring to FIG. 9, the application service profile generator 900 performs a process of generating an application service profile according to a type of sensing data, a service API, and a situation recognition processing rule.

Through the above configuration, the sensor system according to the present invention can easily manage and control the sensor node performing a predetermined sensing operation, and also the sensor node in the management system connected to the sensor node through an IP-based network. It can manage the operation and control of the integrated.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. Additions should be considered to be within the scope of the following claims.

1 illustrates a USN based sensor system in accordance with the present invention.

2 is a diagram showing a detailed configuration of a sensor node according to the present invention.

3 illustrates an operating system abstraction layer supporting multiple operating systems according to the present invention.

4 illustrates the functionality of in-network middleware in accordance with the present invention.

5 shows a simplified configuration of a gateway according to the invention.

6 illustrates a detailed configuration of a gateway according to the present invention.

7 illustrates the USN overlay internet model format.

8 is a diagram illustrating an example of an implementation of an application service using USN according to the present invention.

9 illustrates a USN application service profile generator in accordance with the present invention.

Claims (9)

In the USN based sensor system, A sensor node that senses information for at least one of environmentally hazardous material detection, fire detection, and distance separation detection; And A gateway for performing management and control of the sensor node and collecting the sensed data and transmitting it through a predetermined network; The sensor node and the gateway is USN-based sensor system is equipped with middleware for performing at least one of the control, status check, management, monitoring and maintenance of the sensor node. The method of claim 1, And a plurality of sensor nodes, wherein the middleware processes queries between the plurality of sensor nodes. The method of claim 1, Middleware mounted on the gateway USN-based sensor system that supports multi-hop routing from the gateway to the sensor node. The method of claim 1, The gateway is a USN-based sensor system comprising a sink node for collecting the sensed data sensed by the sensor node, and collects eventuality data. The method of claim 1, A USN-based sensor system connected to the gateway through an IP-based network, the management system including middleware that performs at least one of filtering, integrating, and analyzing sensing data collected from the gateway. The method of claim 1, The sensor node, A control unit connected to at least one sensor unit and performing maintenance of software; And And an RF module connected to the control unit to wirelessly transmit sensing data sensed by the sensor unit. The RF module is a USN-based sensor system for transmitting and receiving wirelessly sensing data based on Zigbee. The method of claim 1, Middleware mounted on the sensor node supports a USN-based sensor system through an abstraction layer. The method of claim 1, And the sensor node determines whether the sensor node is spaced apart by more than a predetermined distance between the transmitting device and the sensor node through the strength of a signal transmitted from a predetermined wireless transmitting device. The method of claim 1, Middleware installed in the gateway is USN-based sensor system to determine whether the sensor node is missing by checking the state of the sensor node.

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