KR20110117342A - Zone based location recognizing apparatus using local wireless communication and method thereof - Google Patents

Abstract

The present invention relates to a region-based location recognition apparatus and method using short-range wireless communication, and more particularly, a mobile node receives a signal of a fixed node rather than a method of calculating a signal strength by receiving a distance of the mobile node. Recognizes the response area that is received and responds to the location of the mobile node to recognize the location of each mobile node to reduce the influence on the surrounding environment and noise to increase the location recognition rate, and the fixed node is configured to variably partition the area according to the signal strength After that, the signal is segmented and transmitted periodically so that only mobile nodes in a specific area respond according to the signal of the corresponding area, thereby reducing positional recognition errors. Each divided area according to the signal strength generated by each fixed node Fixed nodes, if moving nodes exist in the nested region of the By sending the response of the mobile node to the coordinator, the coordinator analyzes the transmission contents of the fixed node according to the preset rules to determine the location of the mobile node, so that the precise position can be identified and the signal strength generated by the plurality of fixed nodes By setting the partitions according to the environment of the corresponding node differently, it is possible to use various location recognition rules according to the environment, thereby facilitating the application of the system.

Description

Zone-based Location Recognition Apparatus and Method Using Near Field Communication {ZONE BASED LOCATION RECOGNIZING APPARATUS USING LOCAL WIRELESS COMMUNICATION AND METHOD THEREOF}

The present invention relates to a region-based location recognition apparatus and method using short-range wireless communication, and more particularly, to a stationary node communicating by using short-range wireless communication of a mobile object responding to a corresponding signal by transmitting radio waves periodically changing signal strength. The present invention relates to an area-based location recognition apparatus and method using short-range wireless communication to identify a location as an area corresponding to a preset signal strength.

Currently, there are various apparatuses for recognizing the location of the terminal using short-range wireless communication as a means for identifying the location of the user terminal within a certain range. These devices use short range wireless communication technologies such as Bluetooth, ZigBee, and the like.

Short-range wireless communication technologies such as Bluetooth and ZigBee have received low-power, low-cost, and ultra-compact technologies as competitive technologies in the area of sensor networks and vertical applications, and in particular, received signal strength (RSSI: Received Signal Strength) Indication) may recognize the location of the specific terminal or the departure of the terminal location.

1 is an example of a location recognizing apparatus managing a moving object by using such RSSI. The location recognizing apparatus may be divided into fixed nodes (1, 2, 3, 4) and moving nodes (7) which are targets for position recognition, and the fixed nodes (1, 2, 3, 4) and moving nodes ( 7) Recognize the location by converting the distance by using the strength (dBm) of the received signal in the wireless environment. That is, the fixed nodes 1, 2, 3, and 4 receive RSSI values, which are indicators of received signal strength of the moving node 7, respectively. For example, the fixed nodes 3, 4 near the moving node 7 receive a high RSSI value and the moving node 7 and the fixed nodes 1, 2 far away transmit a low RSSI value. Receive. Then, each RSSI value received from the plurality of fixed nodes (1, 2, 3, 4) is transmitted to the sink node 5 and compared with the server (6) to identify the location of the mobile node (7) . However, since the RSSI signal in a wireless environment is sensitive to the surrounding environment and noise, errors frequently occur and thus are difficult to apply in reality.

As such, the conventional position recognition device that receives the difference in the strength of the signal transmitted from the mobile node 7 and compares them to find the position is not practical because of an error, and thus, an error does not occur when the object is recognized within a certain range. There is a need for a location recognition apparatus and method using short-range wireless communication that can increase location recognition rate and apply to various environments.

An object of the embodiments of the present invention to solve the above-mentioned problem is to identify a response area in which a mobile node receives a signal of the fixed node and responds to it, rather than a method in which the fixed node receives the distance of the mobile node and calculates a signal strength thereof. The present invention provides a region-based location recognition apparatus and method using short-range wireless communication to reduce the influence on the surrounding environment and noise by recognizing the location of a mobile node for each region.

Another object of the embodiments of the present invention for improving the above-mentioned problem is that only a mobile node of a specific area is configured to have a fixed node variably divide and set a region according to signal strength, and then segment and periodically transmit a signal according to the same. It is an object of the present invention to provide an area-based location recognition apparatus and method using short-range wireless communication that responds according to an area signal.

Another object of the embodiments of the present invention to solve the above-mentioned problem is that each fixed node responds to the mobile node when there is a mobile node in the overlapping area of each partition according to the signal strength generated by each fixed node. The present invention provides a region-based location recognition apparatus and method using short-range wireless communication in which a coordinator analyzes the transmission contents of a fixed node according to a predetermined rule to determine the location of a corresponding mobile node by transmitting to a coordinator.

Another object of the embodiments of the present invention for improving the above-described problem is that the partitions according to the signal strengths generated by the plurality of fixed nodes can be set differently according to the environment of the corresponding node so that they can be applied to various locations according to the environment. It is an object of the present invention to provide an area-based location recognition apparatus and method using short-range wireless communication that enables the recognition rule.

In order to achieve the above object, the area-based location recognition apparatus using short-range wireless communication according to an embodiment of the present invention transmits a signal while varying a predetermined area corresponding to the signal strength by sequentially changing the signal strength, At least one fixed node providing area information according to the mobile node's response to the signal, a mobile node receiving the signal of the fixed node and transmitting a response to the signal to the fixed node; And a coordinator for receiving area information corresponding to the response and using the same to recognize the location of the mobile node based on the area.

The fixed node variably changes the strength of the signal strength according to each located environment to adjust the preset area to transmit the signal, and the coordinator is configured to receive the respective area information transmitted from a plurality of fixed nodes. The location of the mobile node is determined as an area recognized by the analysis by analyzing according to an area recognition rule set according to an environment.

Bluetooth or ZigBee may be used as the short range wireless communication.

In addition, in order to achieve the above object, in the area-based location recognition method using short-range wireless communication according to an embodiment of the present invention, at least one fixed node sequentially changes the signal strength to a predetermined area corresponding to the corresponding signal strength. Transmitting a signal periodically, the mobile node receiving a signal from the fixed node and transmitting a response to the signal to the fixed node, and the fixed node transmitting area information corresponding to the response to the coordinator The coordinator recognizes the location of the mobile node based on the area by using the area information.

The transmitting of the signal may further include transmitting the signal by adjusting the preset area by varying the strength of the signal strength in accordance with an environment in which the fixed node is located.

In the location recognition step, the coordinator analyzes each area information transmitted from a plurality of fixed nodes according to an area recognition rule set according to the environment, and the mobile node is located in the area recognized by the analysis by the coordinator. The step of determining the location of the further comprises.

The area-based location recognition apparatus and method using short-range wireless communication according to an embodiment of the present invention is not a method in which a fixed node receives a distance of a mobile node and calculates a signal strength, and thus a mobile node receives and receives a signal of a fixed node. By identifying the response area to recognize the location of the mobile node for each area, it is effective to increase the position recognition rate by reducing the influence on the surrounding environment and noise.

In the region-based location recognition apparatus and method using short-range wireless communication according to an embodiment of the present invention, the fixed node variably divides and sets an area according to signal strength, and then segments and periodically transmits a signal according to the movement of a specific area. Only the node responds according to the signal of the corresponding area, thereby reducing the position recognition error.

According to an embodiment of the present invention, an apparatus and method for area-based location recognition using short-range wireless communication are mobile nodes when mobile nodes exist in overlapping regions of each partition according to signal strength generated by each fixed node. By sending the response to the coordinator, the coordinator analyzes the transmission contents of the fixed node according to a predetermined rule to determine the location of the corresponding mobile node.

The region-based location recognition apparatus and method using short-range wireless communication according to an embodiment of the present invention may be configured by applying different partitions according to signal strengths generated by a plurality of fixed nodes according to the environment of the corresponding node. It is possible to use a variety of location recognition rules according to the effect to facilitate the system application.

1 is an example of a location recognition apparatus for managing a moving object using RSSI.
2 is an exemplary diagram of a partition area according to signal strength of a fixed node according to an embodiment of the present invention.
3 is a block diagram of a region-based location recognition apparatus according to signal strength of a plurality of fixed nodes according to an embodiment of the present invention.
4 is a flow chart of a region-based location recognition method according to an embodiment of the present invention.
5 is a flow chart of the position recognition step according to an embodiment of the present invention.

The present invention as described above will be described in detail with reference to the accompanying drawings and embodiments.

FIG. 2 is an exemplary diagram of a partitioned area according to signal strength of a fixed node according to an embodiment of the present invention. FIG. 2 (a) shows that the fixed node 100 recognizes a mobile node 40 located in the partitioned area. 2 (b) shows that the fixed node 100 sequentially transmits a signal by changing the signal strength (10, 20, 30).

The fixed node 100 shown in FIG. 2A transmits a signal using short-range wireless communication. Examples of the short range wireless communication include Bluetooth or ZigBee. The fixed node 100 periodically adjusts (10, 20, 30) and transmits the strength of the signal strength according to the received signal strength (RSSI) using the short range wireless communication. That is, the position recognizing apparatus according to the present invention changes the RSSI value by dividing the fixed distance of the fixed node into a zone rather than calculating the distance by receiving the RSSI value of the node to which the existing fixed node moves. While transmitting, it is recognized that the node is located in the area corresponding to the signal strength received from the mobile node. In this case, the zone (Zone) means a zone having a definite boundary having certain characteristics. For example, the zones A-1, B-1, and C-1 are fixed as shown in FIG. It can be defined as the concentric circles 10, 20, 30 having a radius of the distance that the specific signal strength reaches from the node. In addition, the received signal strength (RSSI) is an indicator indicating the strength of the received signal, a value indicating the signal strength of the frequency band of the radio channel generally used in the 802.11 standard. Since the received signal strength refers to the signal power input to the wireless receiver, the gain of the antenna and the loss in the circuit are not considered.

When the operation of the location recognizing apparatus according to the present invention is described in order, the fixed node 100 sequentially changes the signal strength (10, 20, 30) and periodically signals up to a predetermined region corresponding to the corresponding signal strength. Send. The fixed node 100 is configured to know in advance information about a receivable distance according to signal strength in various ways such as a table or a formula. The mobile node 40 receiving the signal of the fixed node 100 transmits a response to the signal to the fixed node 100. Since the fixed node 100 already knows the size of the corresponding area of the signal corresponding to the response, that is, the area B-1 having the radius of the signal reception distance, the mobile node 40 that responded to the area corresponds to the area. It can recognize that it is located in (B-1). As described above, the fixed node 100 receives the distance of the mobile node and not the method of calculating the signal strength, so that the mobile node 40 receives the signal of the fixed node 100 and detects the response area in response thereto. Since the location of the node 40 is recognized as the corresponding area B-1, the location recognition rate can be increased by reducing the influence on the surrounding environment and noise. Also, when a moving node (for example, a person, a vehicle, or a thing) enters a fixed node area by using this, the fixed node detects a moving node through short-range wireless communication and recognizes the location. You can see the departure. In addition, by arranging a plurality of fixed nodes, the location recognition or positional deviation information of each fixed node may be analyzed to track the location of the corresponding node.

FIG. 2B illustrates that the fixed node 100 sequentially transmits a signal to a predetermined area according to signal strength. When the fixed node 100 gradually increases the strength of a signal transmitted by the fixed node 100 and transmits the signals 10, 20, and 30, the area capable of receiving the transmitted signal is sequentially widened. Accordingly, it is possible to determine the area where the mobile node is located in response to the signal. As described above, the fixed node 100 variably divides and sets an area according to signal strength, and then segments and periodically transmits a signal according to the signal so that only the mobile node of a specific area responds according to the signal of the corresponding area. The recognition error can be reduced.

3 is a configuration diagram of an area-based location recognition device according to signal strengths of a plurality of fixed nodes according to an embodiment of the present invention, wherein the area-based location recognition device sequentially changes the signal strength to correspond to the corresponding signal strength. And transmit signals while varying a predetermined area, and receive signals from at least one fixed node (100, 200, 300, 400) or the fixed node (100, 200, 300, 400) that provide area information according to the mobile node's response to the signal. Receives area information corresponding to the response from the mobile node 110, 120, 130, 140, 150, and the fixed node 100, 200, 300, 400 that transmits a response to the fixed node and recognizes the location of the mobile node 110, 120, 130, 140, 150 based on the area. It includes a coordinator 500.

The fixed nodes 100, 200, 300, and 400 are fixedly installed and periodically change the signal strength and transmit a broadcasting message. Since the fixed nodes 100, 200, 300, and 400 have a predetermined distance according to the received signal strength, each of the fixed nodes 100, 200, 300, and 400 periodically adjusts the strength of the received signal strength (A-> B-> C) and broadcasts the message. The concentric region A-1, B-1, C-1 or A-2, B-2, C-2 or A-3, B-3, C-3 or A-4, B-4, C-4) will be transmitted. In this case, as the intensity of the corresponding signal is subdivided, the region is subdivided, so that a more accurate position can be known.

When the mobile node (110, 120, 130, 140, 150) receives a broadcasting message from the fixed node (100, 200, 300, 400), the mobile node (110, 120, 130, 140, 150) sends a response message to the fixed node (100, 200, 300, 400) to send a broadcast message with its own address.

At this time, the fixed node (100, 200, 300, 400) stores the position of the point at which the mobile node responds as zone-based information corresponding to the received signal strength and transmits the area information to the coordinator 500 and the coordinator (500) The connected central server 600 analyzes the area information to recognize the locations of the mobile nodes 110, 120, 130, 140, and 150. For example, if mobile node 2 120 responds when fixed node 2 200 sends a broadcast message at the received signal strength of B-2, the position of mobile node 2 120 is changed to B-2. Corresponding to the area information is transmitted to the coordinator 500. The coordinator 500 receiving the area information converts the location and distance to the B-2 area by using the area-based recognition rule set in the central server 600 to determine the location of the mobile node 120. Recognize based. That is, it can be seen that the mobile node 2 120 is in the B-2 region. In addition, as the area according to the strength of the signal is further subdivided, the position recognition error may be reduced.

As such, by recognizing the location based on the area, the error of the location recognition of the conventional RSSI method can be reduced.

In addition, the coordinator 500 may perform the location recognition function of the central server 600.

In addition, when the mobile nodes 140 and 150 exist in the overlapping areas of the respective partitions according to the signal strengths generated by the fixed nodes 100, 200, 300 and 400, the respective fixed nodes 100, 200, 300 and 400 respond to the mobile nodes 140 and 150. When transmitting to the coordinator 500, the coordinator 500 analyzes the transmission contents of each fixed node (100, 200, 300, 400) according to a predetermined rule to determine the location of the mobile node (140, 150) to determine a more precise location have. For example, if the location of any mobile node 140 transmitted to coordinator 500 has been transmitted by fixed node 1 (100) to area C-1 and fixed node 2 (200) to area B-2, According to the region-based location recognition rule set in the coordinator 500, the location of the mobile node 140 may be defined as the overlapping area, thereby obtaining a more precise location.

In addition, when the fixed node (100, 200, 300, 400) transmits the signal by varying the intensity of the signal in accordance with the environment in each location, the coordinator 500 is a plurality of coarse The area information transmitted from the fixed nodes 100, 200, 300, and 400 may be analyzed according to an area recognition rule set according to the environment, and thus the location of the mobile nodes 140 and 150 may be identified as the area recognized by the analysis. That is, if an environment in which a fixed node 100 is located is a noisy area due to its characteristics, the resolution of the area is reduced by catching a wider interval of signal strength of the fixed node 100 than other fixed nodes 200, 300, and 400. Therefore, the position recognition error due to noise can be reduced. In addition, if an environment in which a fixed node 400 is located is an area in which precise measurement is possible, the resolution of area detection may be higher than that of other fixed nodes 100, 200, and 300 by further dividing the signal strength.

Accordingly, by using a plurality of fixed nodes 100, 200, 300, and 400 having different classifications of signal strengths according to the respective locations, the partitions according to the signal strengths generated by the corresponding fixed nodes 100, 200, 300, and 400 are applied. Various location awareness rules can be used to facilitate system application.

4 is a flowchart of a region-based location recognition method according to an embodiment of the present invention, wherein the region-based location recognition method is a region in which at least one fixed node sequentially changes the signal strength and is preset to correspond to the corresponding signal strength Transmitting a signal while varying (S401), the mobile node receives a signal of the fixed node and transmits a response to the signal to the fixed node (S402), wherein the fixed node corresponds to the response Transmitting the information to the coordinator (S403), the coordinator recognizes the location of the mobile node based on the area using the area information (S404).

The signal transmitting step S401 may further include transmitting the signal by adjusting the preset area by varying the strength of the signal strength according to the environment where the fixed node is located.

5 is a flowchart of a location recognition step according to an embodiment of the present invention, wherein the location recognition step is performed by the coordinator according to an area recognition rule preset according to the environment for each of the area information transmitted from a plurality of fixed nodes. Analyzing (S501, S502), and the coordinator to identify the position of the mobile node to the area recognized by the analysis (S503).

The area analyzing step (S501, S502) is a node area in which each fixed node transmits the response of the mobile node to the coordinator when the mobile node exists in the overlapping area of each partition according to the signal strength generated by each fixed node. The method may further include determining a region in which the mobile node is located by analyzing transmission contents of each fixed node according to a preset rule.

The foregoing embodiments and advantages are merely exemplary and are not to be construed as limiting the present invention. However, the present invention is not limited to the above-described embodiments, and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention. .

100, 200, 300, 400: fixed node
110, 120, 130, 140, 150: mobile node
500: coordinator
600: central server

Claims (6)

An apparatus for recognizing a location of a mobile node using near field communication,
At least one fixed node that transmits a signal while varying a predetermined area corresponding to the signal strength by sequentially changing the signal strength, and provides area information according to the mobile node's response to the signal;
A mobile node receiving the signal of the fixed node and transmitting a response to the signal to the fixed node;
And a coordinator for receiving area information corresponding to the response from the fixed node and recognizing the location of the mobile node based on the area based on the received area information.
The method of claim 1,
The fixed node transmits the signal by variably changing the strength of the signal strength according to each environment, and adjusting the preset area.
The coordinator analyzes each of the area information transmitted from a plurality of fixed nodes according to an area recognition rule set according to the environment, and identifies the location of the mobile node as the area recognized by the analysis. Area-based Location Recognition Device using Near Field Communication.
The method of claim 1,
Area-based location recognition device using short-range wireless communication, characterized in that using the Bluetooth (Bluetooth) or ZigBee (short-range wireless communication).
In the area-based location recognition method using the area-based location recognition device using short-range wireless communication,
a) at least one fixed node sequentially changing a signal strength to transmit a signal while varying a predetermined area corresponding to the signal strength;
b) a mobile node receiving a signal from the fixed node and transmitting a response to the signal to the fixed node;
c) transmitting, by the fixed node, area information corresponding to the response to the coordinator;
and d) the coordinator recognizing the location of the mobile node based on the area information using the area information.
The method of claim 4, wherein step a)
and e) varying the strength of the signal strength according to the respective location of the fixed node to adjust the preset area to transmit the signal. Location recognition method.
The method of claim 5, wherein d)
f) analyzing, by the coordinator, each of the area information transmitted from a plurality of fixed nodes according to an area recognition rule preset according to the environment;
g) The coordinator further comprises the step of identifying the location of the mobile node to the area recognized by the analysis, the area-based location recognition method using short-range wireless communication.

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