KR100816616B1 - Wireless Identification System and Method Using Wireless Access Point - Google Patents

Abstract

Disclosed are a wireless identification system and method using a wireless access point. A wireless identification system according to an embodiment of the present invention includes a plurality of access points, a plurality of wireless tags, a plurality of fixed tags, and a location tracking module. The plurality of access points transmit a wireless signal. A plurality of radio tags receive the radio signals and transmit signal strength of the radio signals together with a radio tag ID. A plurality of fixed tags receive the wireless signals, and transmits the signal strength of the wireless signals with a fixed tag ID. The location tracking module receives the signal strength of the wireless signals transmitted with the wireless tag ID and the signal strength of the wireless signals transmitted with the fixed tag ID to select the wireless tag and the fixed tag having similar signal characteristics. Determine the location of the selected wireless tag relative to the fixed tag. Since the wireless identification system according to the embodiment of the present invention can utilize a commonly used access point as a reader, there is an advantage that the active wireless identification system can be easily and inexpensively implemented.

Description

Radio frequency identification system using access point and method

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a block diagram of a wireless identification system according to an embodiment of the present invention.

2 is a block diagram of a wireless tag of FIG. 1.

3 is a block diagram of the location tracking module of FIG. 1.

4 is a flowchart of a wireless identification method according to an embodiment of the present invention.

5 is a block diagram of another embodiment of the location tracking module of FIG.

6 is a flowchart of a method of tracking a location of a wireless tag in the location tracking module of FIG. 5.

The present invention relates to a wireless identification system and method, and more particularly to a wireless identification system and method capable of tracking the location of a broadband wireless identification tag using a plurality of access points.

Radio frequency identification (RFID) is a technology that incorporates the use of electromagnetic or electrostatic coupling within the radio frequency of the electromagnetic spectrum portion to identify objects, animals or humans. RFID is a technology that replaces bar codes and is increasingly used in the industry. The advantage of RFID is that it does not have to be in direct contact or to show a specific area and to scan.

In general, an RFID system consists of a reader and a tag. In general, a tag may be divided into a passive tag and an active tag. Since the passive tag uses a relatively low frequency band of 30 kHz to 500 kHz, there is an advantage that it can be manufactured relatively easily at low cost, but there is a problem that it should be used at a relatively short distance within a few meters.

Therefore, active tags are used at long distances of tens to hundreds of meters. Active tags use relatively high frequency bands from 850 MHz to 950 MHz and 2.4 GHz to 2.5 GHz, resulting in relatively long effective distances of tens to hundreds of meters. However, the higher the frequency band, the more complicated the circuit structure, and thus, active tags are difficult and expensive. Therefore, there is a need for an easy way to implement an active RFID system at a lower cost.

An object of the present invention is to provide a wireless identification system capable of tracking the location of a wide range wireless identification tag using a plurality of access points.

An object of the present invention is to provide a wireless identification method capable of tracking the location of a broadband wireless identification tag using a plurality of access points.

The wireless identification system according to the embodiment of the present invention for achieving the above technical problem includes a plurality of access points, a plurality of wireless tags, a plurality of fixed tags, and a location tracking module. The plurality of access points transmit a wireless signal. A plurality of radio tags receive the radio signals and transmit signal strength of the radio signals together with a radio tag ID. A plurality of fixed tags receive the wireless signals, and transmits the signal strength of the wireless signals with a fixed tag ID. The location tracking module receives the signal strength of the wireless signals transmitted with the wireless tag ID and the signal strength of the wireless signals transmitted with the fixed tag ID to select the wireless tag and the fixed tag having similar signal characteristics. Determine the location of the selected wireless tag relative to the fixed tag.

In this case, it is preferable that the plurality of wireless tags and the plurality of fixed tags transmit the signal strength of the wireless signals through an access point transmitting the wireless signal having the largest signal strength.

The wireless tag includes a transceiver, a wireless tag information storage unit, and a controller. The transceiver performs transmission and reception with the plurality of access points. The wireless tag information storage unit stores wireless tag information including the wireless tag ID. The control unit measures the signal strength of the received wireless signals, and controls the transceiver to transmit the signal strength of the wireless signals with the wireless tag ID.

At this time, the control unit includes a firmware storage unit for storing the firmware for controlling the operation of the control unit, the firmware storage unit is preferably a nonvolatile memory.

Meanwhile, the transceiver is an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro (wireless broadband) technology standard (high-speed portable internet (HPi) It is preferable that it is a module.

The fixed tag includes a transceiver, a fixed tag information storage unit, and a control unit. The transceiver performs transmission and reception with the plurality of access points. The fixed tag information storage unit stores fixed tag information including the fixed tag ID. The control unit measures the signal strength of the received wireless signals, and controls the transceiver to transmit the signal strength of the wireless signals with the fixed tag ID.

At this time, the control unit preferably includes a firmware storage unit for storing the firmware for controlling the operation of the control unit, it is preferable that the firmware storage unit is a nonvolatile memory.

Meanwhile, the location tracking module includes a receiver, a tag selector, and a location determiner. The receiver receives the signal strength of the wireless signals transmitted with the wireless tag ID and the signal strength of the wireless signals transmitted with the fixed tag ID. The tag selector selects a radio tag and a fixed tag that are similar in signal strength order of the radio signals. The location determiner determines the location of the selected wireless tag based on the location of the selected fixed tag.

In addition, the location tracking module is preferably implemented in the middleware (middleware) between the access point and the integration server.

Wireless tag according to another embodiment of the present invention for achieving the above technical problem includes a transceiver, a tag information storage unit, and a controller. The transceiver performs transmission and reception with a plurality of access points. The tag information storage unit stores tag information including a tag ID. The control unit measures the signal strength of the radio signals received by the transceiver and controls the transceiver to transmit the signal strength of the radio signals together with the radio tag ID through an access point transmitting the radio signal having the largest signal strength. do.

Position tracking module according to another embodiment of the present invention for achieving the above technical problem includes a receiver, a tag selector, and a position determiner. The receiver receives the signal strength of the radio signals transmitted with the radio tag ID from the radio tag and the signal strength of the radio signals transmitted with the fixed tag ID from the fixed tag. The tag selector selects a radio tag and a fixed tag that are similar in signal strength order of the radio signals. The location determiner determines the location of the selected wireless tag based on the location of the selected fixed tag.

Wireless identification method according to an embodiment of the present invention for achieving the another technical problem, transmitting a radio signal at a plurality of access points, at the plurality of radio tags, receives the radio signal, the Transmitting a signal strength with a wireless tag ID, receiving a wireless signal from a plurality of fixed tags, and transmitting signal strength of the wireless signals with a fixed tag ID, wireless transmitted with the wireless tag ID Receiving a signal strength of signals and a strength of wireless signals transmitted together with the fixed tag ID to select a wireless tag and a fixed tag having similar signal characteristics, and determining the position of the selected wireless tag relative to the selected fixed tag It includes a step.

According to another aspect of the present invention, there is provided a method of transmitting and receiving a wireless tag, the method comprising: receiving a wireless signal from a plurality of access points, measuring signal strength of the received wireless signals, and receiving a signal And transmitting the signal strength of the radio signals together with the radio tag ID through the access point transmitting the radio signal having the greatest strength.

Wireless tag location tracking method according to another embodiment of the present invention for achieving the another technical problem, the signal strength of the radio signals transmitted with the wireless tag ID from the wireless tag, and transmitted with the fixed tag ID from the fixed tag Receiving a signal strength of the selected wireless signals, selecting a wireless tag and a fixed tag having a similar order of signal strength of the wireless signals, and determining a position of the selected wireless tag based on the position of the selected fixed tag It includes.

DETAILED DESCRIPTION In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

In general, wireless tags located at the same time and place have similar signal characteristics. The present invention takes advantage of this feature, which allows wireless tags to be fixed at a specific location (hereinafter referred to as a fixed wireless tag, or a sign post (SP)), which moves with fixed wireless tags. Monitor the signal strength of the radio signal in the tags.

At this time, the mobile radio tags received by two or more readers whose signal characteristics are most similar to the predetermined fixed radio tags are regarded as being close to the predetermined fixed radio tag, and the moving radio tags are identified. Can be. Hereinafter, the specific configuration and operation of the present invention will be described.

1 is a block diagram of a wireless identification system according to an embodiment of the present invention. The wireless identification system 100 includes a plurality of access points AP_1 to AP_N, a plurality of wireless tags TAG_1 to TAG_L, a plurality of fixed tags SP_1 to SP_M, and a location tracking module 110. And, it may further include an integrated server for the operation of the entire system.

One of ordinary skill in the art to which the present invention pertains can easily understand the configuration in which the integrated server operates the entire system. In the present invention, the operation of the wireless identification system 100 for tracking the position of the tag is described. The explanation is centered. Hereinafter, an operation of the wireless identification system 100 for tracking the position of a tag will be described in detail with reference to FIG. 1 and FIG. 4, which shows a flowchart of a wireless identification method according to an embodiment of the present invention.

First, the plurality of access points AP_1 to AP_N transmit a radio signal (S401). Each of the plurality of radio tags TAG_1 to TAG_L and the plurality of fixed tags SP_1 to SP_M receives radio signals transmitted from the plurality of access points AP_1 to AP_N. After receiving the radio signals, operations of the plurality of radio tags TAG_1 to TAG_L and the plurality of fixed tags SP_1 to SP_M are as follows.

2 is a block diagram of a wireless tag of FIG. 1. An operation of each of the wireless tags TAG_1 to TAG_L will be described with reference to FIGS. 2 and 4. Each wireless tag TAG_1 to TAG_L includes a transceiver 210, a tag information storage 230, and a controller 250.

The transceiver 210 performs transmission / reception with a plurality of access points AP_1 to AP_N (S403). Therefore, the wireless signal received from the plurality of access points AP_1 to AP_N is received by the transceiver 210.

The tag information storage unit 230 stores tag information, that is, wireless tag information. At this time, the radio tag information includes radio tag IDs for identifying respective radio tags TAG_1 to TAG_L.

The controller 250 measures the signal strength of the radio signals received by the transceiver 210 (S403), and controls the transceiver 210 to transmit the signal strength of the radio signals together with the radio tag ID. In an embodiment of the present invention, it is preferable that the transceiver 210 transmits the signal strength of the radio signals together with the radio tag ID through an access point that has transmitted the radio signal having the largest signal strength.

Hereinafter, the operation of the controller 250 will be described in more detail. When the wireless signal is received, the controller 250 also checks from which access point the received wireless signal is transmitted. After measuring the signal strength of the wireless signals, the controller 250 checks the signal strength of the wireless signal for each access point, and selects the access point that transmitted the largest wireless signal (S405).

Thereafter, the controller 250 outputs the signal strength of the wireless signal for each access point, the wireless tag ID stored in the wireless tag information storage unit 230, and the selected access point to the transceiver 210, and transmits and receives a transceiver ( 210 transmits the signal strength of the wireless signal for each access point together with the radio tag ID to the selected access point (S407).

Meanwhile, as shown in FIG. 2, the controller 250 may include a firmware storage unit 255. The firmware storage unit 255 stores firmware for controlling the operation of the controller 250. The firmware is preferably software for performing the operation of the controller 250. Meanwhile, in the present invention, the firmware storage unit 255 is preferably a nonvolatile memory. One of ordinary skill in the art to which the present invention pertains can easily understand a configuration in which the above-described operation of the control unit is implemented by firmware, which is software, and stored in the firmware storage unit, and thus a detailed description thereof will be omitted.

Meanwhile, in the embodiment of the present invention, since the access point that can be used in the wireless communication system is used as the reader of the wireless identification system, the transceiver 210 preferably uses a module that can be used in the wireless communication system. For example, in an embodiment of the present invention, the transceiver 210 may be an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro: wireless broadband A) a standard of technology (HPi (high-speed portable internet)) module.

Next, operations of the plurality of fixed tags SP_1 to SP_M will be described. In the embodiment of the present invention, the plurality of fixed tags SP_1 to SP_M have the same configuration as the plurality of wireless tags TAG_1 to TAG_L, and thus, each of the fixed tags SP_1 to SP_M also has the configuration shown in FIG. 2. Have Hereinafter, the operation of each fixed tag SP_1 to SP_M will be described with reference to FIGS. 2 and 4.

Each fixed tag SP_1 to SP_M includes a transceiver 210, a tag information storage 230, and a controller 250. The transceiver 210 performs transmission / reception with a plurality of access points AP_1 to AP_N (S413). Therefore, the wireless signal received from the plurality of access points AP_1 to AP_N is received by the transceiver 210.

The tag information storage unit 230 stores tag information, that is, fixed tag information. In this case, the fixed tag information includes fixed tag IDs for identifying respective fixed tags TAG_1 to TAG_L.

The controller 250 measures the signal strength of the wireless signals received by the transceiver 210 (S413), and controls the transceiver 210 to transmit the signal strength of the wireless signals together with the fixed tag ID. In an embodiment of the present invention, the transceiver 210 preferably transmits the signal strength of the radio signals along with the fixed tag ID through the access point transmitting the radio signal having the largest signal strength.

Hereinafter, the operation of the controller 250 will be described in more detail. When the wireless signal is received, the controller 250 also checks from which access point the received wireless signal is transmitted. After measuring the signal strength of the wireless signals, the controller 250 checks the signal strength of the wireless signal for each access point, and selects the access point that transmitted the largest wireless signal (S415).

Thereafter, the controller 250 outputs the signal strength of the wireless signal for each access point, the fixed tag ID stored in the fixed tag information storage unit 230, and the selected access point to the transceiver 210, thereby transmitting and receiving a transceiver ( 210 transmits the signal strength of the wireless signal for each access point together with the fixed tag ID to the selected access point (S417).

Meanwhile, as shown in FIG. 2, the controller 250 may include a firmware storage unit 255. The firmware storage unit 255 stores firmware for controlling the operation of the controller 250. The firmware is preferably software for performing the operation of the controller 250. Meanwhile, in the present invention, the firmware storage unit 255 is preferably a nonvolatile memory. Those skilled in the art to which the present invention pertains can easily understand the configuration of storing the firmware storage unit by implementing the above-described operation of the controller in software firmware, and thus, a detailed description thereof will be omitted.

Meanwhile, in the embodiment of the present invention, since the access point that can be used in the wireless communication system is used as the reader of the wireless identification system, the transceiver 210 preferably uses a module that can be used in the wireless communication system. For example, in an embodiment of the present invention, the transceiver 210 may be an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro: wireless broadband A) a standard of technology (HPi (high-speed portable internet)) module.

Meanwhile, in the above description, the order in which the plurality of wireless tags TAG_1 to TAG_L and the plurality of fixed tags SP_1 to SP_M operate is not mentioned, but one of ordinary skill in the art to which the present invention pertains, It will be appreciated that the operation of the present invention is independent of the order in which the plurality of wireless tags TAG_1 to TAG_L and the plurality of fixed tags SP_1 to SP_M operate.

Referring back to FIG. 1, the location tracking module 110 receives signal strengths of the wireless signals transmitted with the wireless tag ID and signal strengths of the wireless signals transmitted with the fixed tag ID. The fixed tag is selected (S421), and the position of the selected wireless tag with respect to the selected fixed tag is determined (S423). Hereinafter, the configuration and operation of the location tracking module will be described in detail with reference to FIGS. 3 and 4.

3 is a block diagram of the location tracking module of FIG. 1. The location tracking module 110 includes a receiver 111, a tag selector 113, and a location determiner 115. The receiver 111 accesses a wireless tag ID transmitted from the plurality of wireless tags TAG_1 to TAG_L, a signal strength of a wireless signal for each access point, and a fixed tag ID transmitted from the plurality of fixed tags SP_1 to SP_M. Receive the signal strength of the wireless signal for each point.

The tag selector 113 selects a radio tag and a fixed tag having similar signal characteristics. In the embodiment of the present invention, the signal characteristic is preferably the signal strength order of the wireless signals. Hereinafter, an operation of selecting the wireless tag and the fixed tag by the tag selector 113 will be described in detail.

The receiver 111 receives a signal strength of a wireless signal for each access point from each of the plurality of wireless tags TAG_1 to TAG_L and the plurality of fixed tags SP_1 to SP_M. The tag selector 113 selects a radio tag and a fixed tag having the most similar order of signal strength of radio signals in the radio tags TAG_1 to TAG_L and the fixed tags SP_1 to SP_M.

For example, the order of the signal strength of the radio signal received by the radio tag TAG_1 is {the signal strength of the radio signal from the access point AP_1, the signal strength of the radio signal from the access point AP_3, and the access point AP_2. Signal strength of the radio signal from }, The signal strength of the radio signal received by the radio tag TAG_2 is {signal strength of the radio signal from the access point AP_1, the signal strength of the radio signal from the access point AP_2, and the access point AP_3. Signal strength of the radio signal from } Is assumed.

In addition, the signal strength order of the wireless signal received by the fixed tag SP_1 is equal to {the signal strength of the wireless signal from the access point AP_1, the signal strength of the wireless signal from the access point AP_3, and from the access point AP_2. Signal strength of the wireless signal,... } Is assumed.

At this time, the tag selector 113 determines that the wireless tag and the fixed tag having the most identical signal strength order have similar signal characteristics. That is, in the above example, the tag selector selects the wireless tag TAG_1 and the fixed tag SP_2 by determining that the wireless tag TAG_1 and the fixed tag SP_2 have similar signal characteristics. In an embodiment of the present invention, it is preferable that at least two orders of magnitude greater in signal agree with each other.

When the tag selector 113 selects the wireless tag and the fixed tag, the position determiner 115 determines the position of the selected wireless tag with respect to the selected fixed tag and transmits the same to the integration server 130. The position of the radio tag and the fixed tag may be obtained using three access points that transmit three radio signals having the largest signal strength among the radio signals received from the selected radio tag and the selected fixed tag.

Those skilled in the art may easily implement the operation of determining the position of the radio tag or the fixed tag using the strength of the radio signal and the positions of the three access points. For example, the signal strength of each of the wireless signals received from three access points is inversely proportional to the square of the distance between each access point from the radio tag (or fixed tag), so that the position and the radio of each of the three access points The signal strength of each of the signals may be used to determine the location of wireless tags (or fixed tags) that received the wireless signals.

5 is a block diagram of another embodiment of the location tracking module of FIG. 1, and FIG. 6 is a flowchart of a method for tracking the location of a wireless tag in the location tracking module of FIG. 5. 5 and 6, the location of the fixed tag is tracked using the coordinates of the wireless tags and the coordinates of the fixed tags. Hereinafter, another embodiment of tracking the location of a wireless tag will be described in detail with reference to FIGS. 5 and 6.

The location tracking module 110 includes a receiver 510, a location detector 530, and a location determiner 550. The receiver 510 accesses a wireless tag ID transmitted from the plurality of wireless tags TAG_1 to TAG_L, a signal strength of a wireless signal for each access point, and a fixed tag ID transmitted from the plurality of fixed tags SP_1 to SP_M. Receive the signal strength of the wireless signal for each point.

The location detecting unit 530 uses the wireless tag ID and the signal strength of the wireless signal for each access point and the signal strength of the fixed tag ID and the wireless signal for each access point. The position is detected (S621). As described above, a person of ordinary skill in the art may detect the positions of the radio tags and the fixed tags that receive the radio signals using the location of the access points and the signal strength of each of the radio signals. Since it can be easily carried out, a detailed description thereof will be omitted.

When the position detector 530 detects the positions of the wireless tags and the fixed tags, the position determiner 550 compares the positions of the detected wireless tags with the positions of the fixed tags to determine the position of the wireless tag closest to the position of the fixed tag. The location of the wireless tags may be tracked by determining the location of the wireless tags in a manner of viewing the location (S623).

Meanwhile, as shown in FIG. 1, the location tracking module 110 may be implemented between the plurality of access points AP_1 to AP_N and the integration server 130. However, one of ordinary skill in the art will appreciate that the location tracking module may be implemented in an integrated server. In addition, in the embodiment of the present invention, the location tracking module is preferably implemented in the wireless tag system as middleware.

As described above, optimal embodiments have been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not intended to limit the scope of the present invention as defined in the claims or the claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, since the wireless identification system according to the embodiment of the present invention can utilize a commonly used access point as a reader, there is an advantage that an active wireless identification system can be easily and inexpensively implemented.

In addition, since the signal characteristics in an environment where obstacles are present are clearly distinguished from those of an open space, the wireless identification system according to the embodiment of the present invention can easily track a wireless tag in an environment where obstacles exist. There is this.

Claims (31)

A plurality of access points for transmitting a wireless signal; A plurality of wireless tags that receive the wireless signals and transmit signal strengths of the wireless signals together with a wireless tag ID; A plurality of fixed tags that receive the wireless signals and transmit signal strengths of the wireless signals together with a fixed tag ID; And Receiving signal strengths of wireless signals transmitted with the wireless tag ID and signal strengths of wireless signals transmitted with the fixed tag ID, selecting a wireless tag and a fixed tag having similar signal characteristics, and selecting the fixed tag with respect to the selected fixed tag. And a location tracking module for determining the location of the selected wireless tag. The method of claim 1, And the plurality of radio tags and the plurality of fixed tags transmit signal strengths of radio signals through an access point transmitting a radio signal having the largest signal strength. The method of claim 1, wherein the wireless tag, A transceiver for performing transmission and reception with the plurality of access points; A wireless tag information storage unit for storing wireless tag information including the wireless tag ID; And And a controller which measures the signal strength of the received wireless signals and controls the transceiver to transmit the signal strength of the wireless signals together with the wireless tag ID. The method of claim 3, wherein the control unit, And a firmware storage for storing firmware for controlling the operation of the controller. The method of claim 4, wherein And the firmware storage unit is a nonvolatile memory. The method of claim 3, wherein The transceiver is an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro (wireless broadband) technology standard (high-speed portable internet (HPi)) Wireless identification system, characterized in that the module. The method of claim 1, wherein the fixed tag, A transceiver for performing transmission and reception with the plurality of access points; A fixed tag information storage unit for storing fixed tag information including the fixed tag ID; And And a controller which measures the signal strength of the received wireless signals and controls the transceiver to transmit the signal strength of the wireless signals together with the fixed tag ID. The method of claim 7, wherein the control unit, And a firmware storage for storing firmware for controlling the operation of the controller. The method of claim 8, And the firmware storage unit is a nonvolatile memory. The method of claim 7, wherein The transceiver is an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro (wireless broadband) technology standard (high-speed portable internet (HPi)) Wireless identification system, characterized in that the module. The method of claim 1, wherein the location tracking module, A receiver receiving signal strength of wireless signals transmitted with the wireless tag ID and signal strengths of wireless signals transmitted with the fixed tag ID; A tag selector for selecting a radio tag and a fixed tag having a similar order of signal strength of the radio signals; And And a location determiner configured to determine a location of the selected wireless tag based on the location of the selected fixed tag. The method of claim 1, And the location tracking module is implemented as middleware between the access point and an integrated server. A plurality of access points for transmitting a wireless signal; A plurality of wireless tags that receive the wireless signals and transmit signal strengths of the wireless signals together with a wireless tag ID; A plurality of fixed tags that receive the wireless signals and transmit signal strengths of the wireless signals together with a fixed tag ID; And Receiving the signal strength of the wireless signals transmitted with the wireless tag ID and the signal strength of the wireless signals transmitted with the fixed tag ID to detect positions of the plurality of wireless tags and the plurality of fixed tags, And a location tracking module for determining a location of a fixed tag closest to a wireless tag as the location of the wireless tag. A transceiver for performing transmission and reception with a plurality of access points; A tag information storage unit for storing tag information including a tag ID; And A control unit for measuring the signal strength of the wireless signals received by the transceiver and controlling the transceiver to transmit the signal strength of the wireless signals together with the wireless tag ID through an access point transmitting the wireless signal having the largest signal strength Wireless tag comprising a. The method of claim 14, wherein the control unit, And a firmware storage for storing firmware for controlling the operation of the controller. The method of claim 15, And the firmware storage unit is a nonvolatile memory. The method of claim 14, The transceiver is an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro (wireless broadband) technology standard (high-speed portable internet (HPi)) Wireless tag, characterized in that the module. A receiver for receiving signal strengths of wireless signals transmitted with a wireless tag ID from a plurality of wireless tags, and signal strengths of wireless signals transmitted with a fixed tag ID from a plurality of fixed tags; A tag selector for selecting a radio tag and a fixed tag having a similar order of signal strength of the radio signals; And And a location determiner configured to determine a location of the selected wireless tag based on the location of the selected fixed tag. A receiver for receiving signal strengths of wireless signals transmitted with a wireless tag ID from a plurality of wireless tags, and signal strengths of wireless signals transmitted with a fixed tag ID from a plurality of fixed tags; A position detector for detecting positions of the plurality of wireless tags and positions of the plurality of fixed tags; And And a positioning unit determining a position of the fixed tag closest to the wireless tag as the position of the wireless tag. At a plurality of access points, transmitting a wireless signal; Receiving, at a plurality of radio tags, the radio signal and transmitting signal strength of the radio signals together with a radio tag ID; Receiving, at a plurality of fixed tags, the wireless signal and transmitting signal strength of the wireless signals together with a fixed tag ID; Selecting a wireless tag and a fixed tag having similar signal characteristics by receiving signal strengths of wireless signals transmitted with the wireless tag ID and wireless signals transmitted with the fixed tag ID; And Determining a location of the selected wireless tag relative to the selected fixed tag. The method of claim 20, The transmitting with the wireless tag ID and the transmitting with the fixed tag ID are wireless identification method, characterized in that the transmission through the access point transmitting the radio signal having the largest signal strength. The method of claim 20, The wireless signal can be an 802.11b or 802.11g wireless Ethernet standard (Wi-Fi (wireless fidelity)) module, or 802.16e wireless broadband transmission technology standard (Wibro: wireless broadband technology standard (high-speed portable internet (HPi) Wireless identification method characterized in that the transmission and reception according to. A computer readable recording medium having recorded thereon a program for performing the method of claim 20. Receiving a radio signal from a plurality of access points; And Measuring the signal strength of the received wireless signals, and transmitting the signal strength of the wireless signals together with a wireless tag ID through an access point transmitting the wireless signal having the largest signal strength. Signal transmission and reception method in. A computer readable recording medium having recorded thereon a program for performing the method of claim 24. Receiving signal strengths of wireless signals transmitted with wireless tag IDs from the plurality of wireless tags, and signal strengths of wireless signals transmitted with fixed tag IDs from the plurality of fixed tags; Selecting a radio tag and a fixed tag having a similar signal strength order of the radio signals; And And determining the location of the selected wireless tag based on the location of the selected fixed tag. A computer readable recording medium having recorded thereon a program for performing the method of claim 26. At a plurality of access points, transmitting a wireless signal; Receiving, at a plurality of radio tags, the radio signal and transmitting signal strength of the radio signals together with a radio tag ID; Receiving, at a plurality of fixed tags, the wireless signal and transmitting signal strength of the wireless signals together with a fixed tag ID; Detecting the position of the plurality of wireless tags and the position of the plurality of fixed tags by receiving the signal strength of the wireless signals transmitted with the wireless tag ID and the strength of the wireless signals transmitted with the fixed tag ID; And Determining the position of the fixed tag closest to the radio tag as the position of the radio tag. A computer readable recording medium having recorded thereon a program for performing the method of claim 28. Receiving signal strengths of wireless signals transmitted with wireless tag IDs from the plurality of wireless tags, and signal strengths of wireless signals transmitted with fixed tag IDs from the plurality of fixed tags; Detecting a location of the plurality of wireless tags and a location of the plurality of fixed tags; And And determining the position of the fixed tag closest to the radio tag as the position of the radio tag. A computer-readable recording medium having recorded thereon a program for performing the method of claim 30.

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