KR20110057442A - RS-I and PLC-based Location-based Service System and Method - Google Patents

Abstract

The present invention relates to a LBS system and method based on RSSI and PLC, the configuration comprising: a mobile node capable of performing RF communication, and movable; A plurality of fixed nodes performing RF communication with the mobile node, calculating RSSI values received from the mobile node via RF communication, and performing a PLC; And a PLC server connected to the fixed nodes to the PLC and collecting and monitoring the position data according to the RSSI value of the mobile node transmitted from the fixed node. The present invention can be used to complement the unsafe RF by using a combination of RF and PLC, to reduce the waste of resources by using a PLC that does not require the installation of other communication devices, can be conveniently installed and operated anywhere Since a large number of nodes are not required, and especially a router is used, location estimation in a large building can be easily performed.

Description

Location-based service system and method based on RS-I and PRC C {SYSTEM AND METHOD FOR LOCATION-BASED SERVICE BASED ON RECEIVED SIGNAL STRENGTH INDICATOR AND POWER LINE COMMUNICATION}

The present invention relates to RSSI and PLC-based LBS system and method, and more particularly, to a RSSI and PLC-based LBS system and method that can easily estimate the position of the mobile node by mixing RF and PLC.

 The ubiquitous environment is an information and communication environment in which a user can freely access a network regardless of a location without recognizing a wired or wireless network environment. In order to realize such a ubiquitous environment, a lot of researches are being conducted on the importance and recognition of wireless sensor network technology.

One of the major findings of the study is the Global Positioning System (GPS) using satellites developed for military purposes. Such GPS is currently being applied to a variety of means of transportation such as vehicles and ships. However, GPS signals from satellites are not detected indoors, and it is impossible to apply them because the error range is wide.

Therefore, the wireless sensor network is being researched and operated as indoor location estimation technology. Wireless sensor network technology is a 2.4GHz frequency band, which is widely applied to the home network field because of its short range, low speed, low power, and low cost. Indoor location estimation technology using wireless sensor network utilizes RSSI (Received Signal Strength Indicator (RSSI), the signal strength of RF, to attach cellular nodes to specific locations and beacons to indoor location metabolic nodes. After calculating the RSSI value by triangulation method and transmitting the location data through the RF to the base station.

However, this method has a disadvantage in that a large number of nodes must be installed and operated in a cellular manner in order to minimize an error range and transmit position data through RF.

The present invention has been proposed to solve the above problems, and an object thereof is to provide an RSSI and PLC-based LBS system and method that can be easily applied indoors and can reduce errors.

Another object of the present invention is to provide an RSSI and PLC-based LBS system and method for easily estimating the position of a mobile node with a small number of nodes.

In accordance with an aspect of the present invention, an RSSI and a PLC-based LBS system includes: a mobile node capable of performing RF communication and moving; Performing a plurality of RF communication with the mobile node, calculating a received signal strength indicator (RSSI) value received from the mobile node through the RF communication, and performing a power line communication (PLC); Fixed nodes; And a PLC server connected to the fixed nodes to the PLC and collecting and monitoring position data according to the RSSI value of the mobile node transmitted from the fixed node.

In addition, the above-described RSSI and PLC-based LBS method according to the present invention for achieving the above object, the mobile node periodically radiating a beacon message to the fixed node; Specific fixed nodes receiving the beacon message, calculating RSSI values of the mobile nodes, and estimating the location of the mobile nodes; Transmitting, by the specific fixed nodes, position data of the mobile node according to the RSSI value to the PLC server; And collecting and monitoring the position data of the mobile node by the PLC server.

In addition, another RSSI and PLC-based LBS system according to the present invention for achieving the above object is a mobile node that performs RF communication, and movable; A plurality of routers forming an Ad-hoc network through RF communication with the mobile node and calculating RSSI values received from the mobile node; A plurality of fixed nodes that perform RF communication with the router and include a specific fixed node that estimates the location of the mobile node with location data according to the RSSI value of the mobile node transmitted from the router; And a PLC server connected to the fixed nodes to the PLC and collecting and monitoring position data of the mobile node transmitted from the specific fixed node.

The specific fixed node of the above-described RSSI and PLC-based LBS system according to the present invention is characterized in that it is predetermined or any fixed node of the plurality of fixed nodes.

In addition, another RSSI and PLC-based LBS method according to the present invention for achieving the above object comprises the steps of the mobile node periodically radiating a beacon message to the router; Calculating a RSSI value of the mobile node by the router receiving the beacon message; Transmitting, by the router, location data of the mobile node according to the RSSI value to a predetermined or arbitrary specific fixed node; Estimating the position of the mobile node by the specific fixed node; Transmitting, by the specific fixed node, position data of the mobile node to the PLC server; And collecting and monitoring the position data of the mobile node by the PLC server.

The process of radiating a beacon message by the mobile node of the RSSI and PLC-based LBS method according to the present invention is periodically radiated according to a time set in the mobile node, and a specific operation is performed when a button is provided to the mobile node. It is characterized by the fact that / message transmission is performed.

The present invention can be used to complement the RF communication distance in the room by using the RF and PLC together, to reduce the waste of resources by using a PLC that does not need to install other communication facilities, and conveniently installed in any place can do.

In addition, a large number of nodes are not required, and in particular, when using a router, location estimation in a large building can be easily performed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, the true scope of protection of the present invention should be determined only by the appended claims.

Hereinafter, an RSSI and a PLC-based LBS system and method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First embodiment

1 is a diagram illustrating an LBS system based on RSSI and a PLC according to a first embodiment of the present invention, and FIG. 2 is a diagram illustrating a screen displayed on the PLC server of FIG. 1.

1 and 2, the LBS system based on RSSI and PLC according to the present embodiment includes a mobile node 100 (BD; blind device), a plurality of fixed nodes (200, RD; reference device), and a PLC server ( 300).

The mobile node 100 is a mobile node, and is provided with an RF unit for RF communication. The mobile node 100 is a node for location estimation, and is a node possessed by a person to track a location indoors.

A plurality of fixed nodes 200 (200a, 200b ... 200n) are provided. The fixed node 200 performs RF communication with the mobile node 100 and is provided with an RF unit for this purpose. The fixed node 200 calculates the RSSI value received from the mobile node 100 through RF communication, and estimates the position of the mobile node 100 through this.

The fixed node 200 performs power line communication (PLC). PLC is a technology that picks up high-frequency signals of several tens to hundreds of kilowatts together on copper wires with alternating current in the 50-60 kHz frequency line coming into the home by power lines, and selects only the communication signals from the electric lines by using a modem. PLC can use the existing power line as it is, the investment cost is low, and the terminal can be supplied cheaply compared with the wireless communication method. There is an effect that can be reduced.

The fixed node 200 may be installed on the wall or ceiling of a designated place for position estimation. The fixed node 200 is connected to the PLC server 300 through a PLC.

The PLC server 300 is connected to the fixed nodes 200 through the PLC. The PLC server 300 collects position data according to the RSSI value of the mobile node 100 from a specific fixed node, for example, the first and second fixed nodes 200a and 200b among the fixed nodes 200 through the PLC. In other words, the PLC server 300 is applied to the RSSI values of the mobile nodes 100 transmitted from the first and second fixed nodes 200a and 200b which are fixed nodes at positions where the RSSI values of the mobile nodes 100 can be calculated. Collect and monitor location data accordingly.

In the present embodiment, the first and second fixed nodes 200a and 200b are located close to the mobile node 100 and receive RSSI values from the mobile node 100 as an example. It is not.

A screen in which the PLC server 300 collects and monitors position data of the mobile node 100 from the fixed node 200 is shown in FIG. 3. As shown in FIG. 3, the PLC server 300 may indicate the location of the mobile node 100 on a map of the corresponding room, and may include an ID (Reference Node ID) 301 of the fixed node 200 and the mobile node 100. ID (Blind Node) 303, button data (Blind Node Action) 305 of the mobile node 100, RSSI value 307 of each fixed node 200, and RSSI value monitoring packet (Analyzed Packet Viewer; 309 may be output and displayed.

Here, the button data of the mobile node 100 is periodically radiated according to the time set in the mobile node 100, and by pressing the button equipped with the subject as necessary, the beacon message / task / message fixed nodes Data displayed when radiating to 200. That is, in the RSSI and PLC-based LBS system according to the present embodiment, the mobile node 100 may include a button, and due to the operation of pressing the button, the target person possessing the mobile node 100 interprets any job / message. It may be provided in the form of the transmission from the location.

Hereinafter, an RSSI and a PLC-based LBS method according to the present embodiment will be described. 3 is a flowchart illustrating an RSSI and a PLC-based LBS method according to a first embodiment of the present invention.

Referring to FIG. 3, in the LBS method based on RSSI and PLC according to the present embodiment, first, the mobile node 100 is configured to have fixed nodes 200, for example, first to nth fixed nodes 200a, 200b. 200n) to emit a beacon message (S301, S303, S305). Here, the radiation of the beacon message, as described above, by emitting a beacon at a certain time of the mobile node 100 may start the position estimation and transmit the work / message by pressing a button provided.

Next, the first and second fixed nodes 200a and 200b calculate RSSI values and estimate positions of the mobile node 100 (S307 and S309). That is, among the first to nth fixed nodes 200a, 200b... 200n receiving the beacon message from the mobile node 100, the first and second fixed nodes 200a, which are located close to the mobile node 100, 200b) performs RSSI value calculation and position estimation.

Subsequently, the first and second fixed nodes 200a and 200b transmit the position data of the mobile node 100 to the PLC server 300 through the PLC (S311 and 313). For this reason, the PLC server 300 collects position data of the mobile node 100 and performs monitoring (S315).

Second embodiment

RSSI and PLC-based LBS system and method according to the present embodiment is similar to the invention according to the first embodiment described above, but is characterized in that a router is further provided. In this embodiment, descriptions of portions similar or identical to those of the first embodiment will be omitted.

4 is a diagram illustrating an LBS system based on RSSI and a PLC according to a second embodiment of the present invention.

Referring to FIG. 4, the LBS system based on RSSI and PLC according to the present embodiment includes a mobile node 100, a plurality of routers 400, a router, a plurality of fixed nodes 200, and a PLC server 300. do.

The router 400 performs RF communication with the fixed nodes 200a and 200b and includes an RF unit for this purpose. The router 400 forms an Ad-hoc network with the fixed nodes 200a and 200b, and the fixed nodes 200a and 200b may calculate RSSI values using beacons transmitted from the mobile node 100. The router 400 is provided for an LBS system applied to a large space of a large building, and a large number of fixed nodes 200 should be installed in the large space.

When the mobile node 100 emits a beacon message, the router 400 receives a beacon message by the plurality of fixed nodes 200a and 200b, calculates an RSSI value, and calculates an RSSI value to the router 400 to calculate the RSSI. The position data according to the value is transmitted to the specific fixed node 200 ′.

The fixed node 200 is provided in plural and performs RF communication with the router 400. Among the fixed nodes 200, a specific fixed node 200 ′ receives location data according to the RSSI value of the mobile node 100 from the router 400. The particular fixed node 200 ′ estimates the location of the mobile node 100 based on the location data received from the router 400. Herein, the specific node 200 ′ may be preset or arbitrarily designated.

The PLC server 300 is connected to a specific node 200 'through a PLC. The PLC server 300 transmits the position data of the mobile node 100 calculated by the fixed nodes 200 through the PLC to Ad_hoc to the router 400, and then to the specific fixed node 200 ′ to transfer the mobile node 100 to the mobile node 100. Collect and monitor location data.

Hereinafter, an RSSI and a PLC-based LBS method according to the present embodiment will be described. 5 is a flowchart illustrating an RSSI and a PLC-based LBS method according to a second embodiment of the present invention.

Referring to FIG. 5, in the LBS method based on RSSI and PLC according to the present embodiment, a mobile node 100 first transmits a beacon message to routers 200, for example, first to nth routers 200a. It emits (S501, S503). Here, the emission of the beacon message may be performed by pressing a button provided in the mobile node 100, as described above.

Next, the fixed node 200 calculates an RSSI value (S505 and S507). The fixed node 200 transmits the Ad-hoc to the router 400 through the Ad-hoc, and the router 400 transmits the position data of the mobile node 100 according to the RSSI value to the specific fixed node 200 '(S509 and S511). ).

Subsequently, the specific fixed node 200 ′ estimates the position of the mobile node 100 based on the received position data of the mobile node 100 (S513). The specific fixed node 200 ′ transmits the position data of the mobile node 100 to the PLC server 300 through the PLC (S515). For this reason, the PLC server 300 collects position data of the mobile node 100 and performs monitoring (S517).

On the other hand, the LBS system and method based on RSSI and PLC according to the present embodiment is not limited to the above-described form, it can be variously modified within the scope without departing from the technical spirit of the present invention. This will be readily apparent to those skilled in the art.

1 is a diagram illustrating an LBS system based on RSSI and a PLC according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a screen displayed on the PLC server of FIG. 1.

3 is a flowchart illustrating an RSSI and a PLC-based LBS method according to a first embodiment of the present invention.

4 is a diagram illustrating an LBS system based on RSSI and a PLC according to a second embodiment of the present invention.

5 is a flowchart illustrating an RSSI and a PLC-based LBS method according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100; Mobile node 200; Fixed node

300; PLC server 400; router

Claims (3)

A mobile node capable of performing RF communication and being movable; Performing a plurality of RF communication with the mobile node, calculating a received signal strength indicator (RSSI) value received from the mobile node through the RF communication, and performing a power line communication (PLC); Fixed nodes; And A PLC server connected to the fixed nodes and the PLC, the PLC server collecting and monitoring position data according to the RSSI value of the mobile node transmitted from the fixed node; LBS based on RSSI and PLC -Based Service system. In the LBS method using the RSSI and PLC-based location-based service system of claim 1, Periodically radiating a beacon message to the fixed node by the mobile node; Specific fixed nodes receiving the beacon message, calculating RSSI values of the mobile nodes, and estimating the location of the mobile nodes; Transmitting, by the specific fixed nodes, position data of the mobile node according to the RSSI value to the PLC server; And And collecting and monitoring the position data of the mobile node by the PLC server. A mobile node capable of performing RF communication and being movable; A plurality of routers forming an Ad-hoc network through RF communication with the mobile node and calculating RSSI values received from the mobile node; A plurality of fixed nodes that perform RF communication with the router and include a specific fixed node that estimates the location of the mobile node with location data according to the RSSI value of the mobile node transmitted from the router; And And a PLC server connected to the fixed nodes to the PLC and configured to collect and monitor position data of the mobile node transmitted from the specific fixed node.

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