KR101630808B1 - Tag device and control method thereof - Google Patents
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- KR101630808B1 KR101630808B1 KR1020150056041A KR20150056041A KR101630808B1 KR 101630808 B1 KR101630808 B1 KR 101630808B1 KR 1020150056041 A KR1020150056041 A KR 1020150056041A KR 20150056041 A KR20150056041 A KR 20150056041A KR 101630808 B1 KR101630808 B1 KR 101630808B1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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Abstract
The present invention proposes a tag device capable of maximizing a tag accommodating capacity in a communication device (AP) and an operation method of the tag device in a tag signal-based positioning technique (TDOA positioning technology).
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning technique based on a tag signal for measuring a position of a tag device based on a tag signal transmitted from the tag device, AP) to maximize tag capacity.
Currently, the Real Time Location Service (RTLS), which provides various information according to the real time location of moving objects, is a very familiar service that is commonly used.
In an RTLS system providing such RTLS, basically, the position of the moving object must be measured (grasped).
Among the positioning techniques for measuring the position of a moving object (hereinafter referred to as a tag device) that can be used for RTLS, a tag-based positioning technique (TDOA: Time Difference Of Arrival).
When the tag device periodically transmits a tag signal, the tag signal of the tag device is received by neighboring APs, assuming that the TDOA positioning technology is synchronized between APs (Access Points) located in the periphery of the tag device And the position of the tag device is measured (grasped) based on the time difference.
As described above, in the conventional TDOA positioning technique, the tag device periodically transmits the tag signal.
Since the tag device independently performs the operation of transmitting the tag signal periodically, without any communication or cooperation with the other tag device or the AP, it is possible for the AP device to perform collision ) May occur.
If a collision of the tag signal occurs in the AP, the positioning of the tag devices transmitting the collided tag signal fails, and the AP can not provide the RTLS to the corresponding tag devices. Therefore, The amount of the tag device (hereinafter referred to as " tag accommodating capacity ") can be reduced.
Therefore, the present invention proposes a method of minimizing the collision of the tag signals and solving the tag accommodating capacity decrease in the AP caused by the collision of the tag signals, thereby maximizing the tag accommodating capacity in the AP do.
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object to be achieved by the present invention is to maximize the tag accommodating capacity in a communication device (AP) in a tag signal based positioning technique (TDOA positioning technology) And a method of operating the tag device and the tag device.
According to a first aspect of the present invention, there is provided a tag apparatus comprising: a signal receiver for receiving a synchronization signal between communication devices located in the periphery of the tag apparatus; A transmission time determining unit that determines a transmission time point of a tag signal to be transmitted to the communication device by using the synchronization signal, differently from other tag devices that have received the synchronization signal; And a tag signal transmitter for transmitting a tag signal to the communication device upon reaching the transmission time point.
Preferably, the transmission time determination unit may determine the transmission time using a time point at which the synchronization signal is received and unique identification information uniquely assigned to the tag device.
Preferably, the transmission time determination unit includes a time point when the synchronization signal is received, unique identification information (Index X) uniquely assigned to the tag device, and a tag signal transmission interval (Tag Term) To determine the transmission time (T transmission).
Preferably, the transmission time determination unit may determine a transmission time point T at which the synchronization signal is received, unique identification information (Index X) uniquely assigned to the tag device, a predetermined transmission reservation interval (Safe Margin) The transmission timing (T transmission) can be determined using the inter-tag signal transmission interval (Tag Term).
Preferably, the synchronization signal may be a signal transmitted from the specific one of the communication devices to the remaining communication devices every predetermined synchronization cycle.
Preferably, the specific communication device is a master AP, and the remaining communication device may be a slave AP.
Preferably, the tag signal transmitter may operate in a basic transmission mode in which the tag signal is transmitted every predetermined tag signal transmission period when the synchronization signal is not received so that the preset reception waiting time has elapsed.
According to a second aspect of the present invention, there is provided a method of operating a tag device, comprising: receiving a synchronization signal between communication devices located in the periphery of the tag device; And a transmission time determination step of determining, using the synchronization signal, a transmission time point of a tag signal to be transmitted to the communication device, different from that of another tag device that has received the synchronization signal.
Preferably, the transmission time determination step may determine the transmission time point by using the time at which the synchronization signal is received and the unique identification information uniquely allocated to the tag device.
Thus, according to the tag apparatus and the operation method of the tag apparatus according to the present invention, the effect of efficiently maximizing the tag accommodating capacity in the communication apparatus (AP) in the tag-based positioning technique (TDOA positioning technology) .
1 is a block diagram illustrating an RTLS system including a tag apparatus according to a preferred embodiment of the present invention.
2 is a block diagram showing a configuration of a tag device according to a preferred embodiment of the present invention.
3 is a flowchart illustrating an operation method of a tag apparatus according to a preferred embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
1 is a diagram illustrating an RTLS system including a tag apparatus according to a preferred embodiment of the present invention.
As shown in FIG. 1, a real time location service (RTLS) system according to a preferred embodiment of the present invention includes a moving object that can be used for RTLS, that is, a plurality of tag devices and a communication device for providing RTLS .
A number of
Hereinafter, for convenience of description, one tag device 1 among a plurality of
The communication device is an apparatus that provides RTLS to the tag device 1 through a wireless communication method, and may be an AP (Access Point) and a device such as a (macro or small) base station.
Hereinafter, for convenience of description, the communication apparatus will be referred to as an AP and it will be assumed that four communication apparatuses AP1, AP2, AP3, and AP4 are located around the tag apparatus 1 as shown in FIG.
At present, in the RTLS system, basically, the position of the tag device must be measured (grasped).
Among the positioning techniques for measuring the position of the tag device, there is a time difference of arrival (TDOA) technique based on a tag signal for measuring the position of the tag device based on the tag signal transmitted from the tag device.
The TDOA positioning technique will be briefly described with reference to the tag device 1. The tag device 1 periodically transmits tag signals (WiFi, BT, RFID) to the RFID device 1 under the condition that the TDOA positioning technology is synchronized between AP1, AP2, AP3, , ZigBee, UWB, etc.).
Each of the peripheral AP1, AP2, AP3, and AP4 receiving the tag signal of the tag device 1 transmits the time information of the received tag signal and the device information of the tag device 1 that has transmitted the tag signal to a positioning server (not shown) . At this time, according to the distance between the tag device 1 and AP1, AP2, AP3, and AP4, there will be a difference between the time when the tag signal of the tag device 1 is received at each of AP1, AP2, AP3, and AP4.
In the positioning server (not shown), based on the information provided from each of the AP1, AP2, AP3, and AP4, based on the time difference between the tag signals of the tag devices 1, AP1, AP2, AP3, 1 can be measured (grasped).
As described above, in the existing TDOA positioning technique, the tag device as the positioning target periodically transmits the tag signal.
Since the tag device independently performs the operation of transmitting the tag signal periodically, without any communication or cooperation with the other tag device or the AP, it is possible for the AP device to perform collision ) May occur.
If a collision of the tag signal occurs in the AP, the positioning of the tag devices transmitting the collided tag signal fails, and the AP can not provide the RTLS to the corresponding tag devices. Therefore, The amount of the tag device (hereinafter referred to as " tag accommodating capacity ") can be reduced.
In view of this, the present invention minimizes the collision of the tag signals and solves the tag accommodating capacity decrease in the AP which may be caused by the collision of the tag signals, thereby maximizing the tag accommodating capacity in the AP And proposes a tag device for realizing such a scheme.
Hereinafter, a tag device according to a preferred embodiment of the present invention will be described in detail with reference to FIG. Hereinafter, the
2, a
The
For example, as shown in FIG. 1, it is assumed that four communication devices, that is, AP1, AP2, AP3, and AP4 are located around the
In this case, for the application of TDOA positioning technology, a synchronized state is assumed between AP1, AP2, AP3 and AP4.
AP1, AP2, AP3, and AP4. In the first embodiment, a synchronization signal is transmitted / received between the AP1, the AP2, the AP3, and the AP4 via the wired Ethernet. Synchronization can be performed.
Meanwhile, in the second embodiment of the synchronization process between APs, synchronization between AP1, AP2, AP3 and AP4 can be performed by transmitting / receiving a synchronization signal between AP1, AP2, AP3 and AP4 via radio.
For example, AP1, AP2, AP3, and AP4 can be classified into a master AP and a slave AP. As shown in FIG. 1, AP1 is a master AP and AP2, AP3, and AP4 are slave APs.
Accordingly, in the second embodiment of the synchronization process between the APs, the master AP, i.e., AP1 transmits a synchronization signal to the slave APs AP2, AP3 and AP4 every predetermined synchronization cycle (e.g., 200 ms), thereby synchronizing AP1, AP2, AP3, Can be performed.
Here, since the
Accordingly, the
As a result, the synchronization signal received by the
Of course, in the case of following the first embodiment of the synchronization process between the APs, the
Meanwhile, in the present invention, the
That is, it is also possible to provide a separate signal transmitting apparatus (not shown) for transmitting a signal (synchronization signal) for determining the transmission time point of the tag signal. In this case, the
The transmission
Specifically, the transmission
More specifically, unique identification information unique to each of the tag devices 1, 2, 3, ... is assigned.
For example, supposing that 30 tag devices are operated in the area where RTLS is to be provided through AP1, AP2, AP3, and AP4, each tag device is provided with unique identification information of one of 30 different values from Index 0 to Index 29 Can be uniquely assigned. At this time, the entity that manages the assignment of the unique identification information may be a positioning server (not shown) or a separate allocation server (not shown).
According to one embodiment, when a synchronization signal is received through the
Hereinafter, for ease of explanation, it is assumed that Index 3 is assigned as the unique identification information to the
In this case, the transmission
The
In this case, the other tag devices 2, 3, ... receiving the synchronization signal also have the same timing as the above-mentioned equation (1) (T transmission = T + X) using the unique identification information (Index X) of the synchronization signal and the transmission timing When it reaches the time point (T transmission = T + X) delayed by the time X, it will generate a tag signal and transmit it to AP1, AP2, AP3, AP4.
According to another embodiment, when the synchronization signal is received through the
Hereinafter, it is assumed that the transmission interval (Tag Term) is set to 2 ms.
In this case, the transmission
The
At this time, the other tag apparatuses 2, 3, ... receiving the sync signal also have the following relationship according to the present invention: Equation (3) (T transmission = T + (2 x Index X)) using the unique identification information (Index X) and Tag Term (2 ms) of the synchronization signal AP2, AP3, and AP4 when it reaches the time point (T transmission = T + (2 x X)) delayed by the delay time (2 x Index X) according to the unique identification information (Index X) will be.
According to another embodiment, when the synchronization signal is received through the
Hereinafter, it is assumed that 10ms is set as the transmission margin (Safe Margin) and 2ms is set as the transmission interval (Tag Term).
In this case, the transmission
The
At this time, the other tag apparatuses 2, 3, ... receiving the sync signal also have the following relationship according to the present invention: Equation (3) (T transmission = T + 10 + (2 x Index X)) using the unique identification information (Index X), Safe Margin (10 ms) and Tag Term (2 ms) (T transmission = T + 10 + (2 x X)) delayed by a delay time (10+ (2 x Index X)) according to different unique identification information (Index X) , And generates a tag signal and transmits it to AP1, AP2, AP3, and AP4.
As a result, according to the present invention, each of the tag apparatus 100 (same as the tag apparatus 1), the tag apparatuses 2, 3, ... uses a synchronization signal between APs to differentiate the transmission timing of the tag signal from the other tag apparatuses The tag signal is transmitted at a dispersed time point.
Therefore, the possibility that a collision in which the tag signals from the tag apparatus 100 (same as the tag apparatus 1) and the tag apparatuses 2, 3, ... are received at the same time on AP1, AP2, AP3, AP4 will be significantly reduced.
On the other hand, the
In this case, since the
To this end, the tag
That is, if the synchronizing signal is not received so that the reception waiting time elapses, the tag
In the present invention, it is also important to manage the unique identification information used for determining the transmission time. Therefore, it is preferable that a subject (for example, a positioning server, an allocation server, etc.) that manages allocation of unique identification information applies an optimization management scheme for efficiently managing unique identification information.
For example, when a signal from a tag device to which unique identification information (e.g., Index 29) is assigned is not checked for a predetermined period of time (for example, a positioning server, an allocation server, , It is considered that the drive is turned off or lost for the tag device, and the unique identification information (for example, Index 29) is assigned to another tag device and can be recycled.
As described above, the tag apparatus according to the present invention minimizes the collision of the tag signals that may occur in the AP, resolves the tag capacity reduction in the AP that may be caused by the collision of the tag signals, The tag accommodating capacity can be efficiently maximized.
Hereinafter, an operation method of the tag apparatus according to the preferred embodiment of the present invention will be described with reference to FIG. For convenience of description, description will be given with reference to Figs. 1 and 2 described above.
The method of operation of the
For example, as shown in FIG. 1, it is assumed that four communication devices, that is, AP1, AP2, AP3, and AP4 are located around the
In this case, for the application of TDOA positioning technology, a synchronized state is assumed between AP1, AP2, AP3 and AP4.
AP1, AP2, AP3, and AP4 are synchronized by transmitting a synchronization signal to the slave APs AP2, AP3, and AP4 every predetermined synchronization period (e.g., 200 ms) Synchronization between AP3 and AP4 can be performed.
The operation method of the
For example, the operation method of the
When the synchronizing signal is received (Yes in S100), the method of operation of the
Specifically, the operation method of the
More specifically, unique identification information unique to each of the tag devices 1, 2, 3, ... is assigned.
For example, supposing that 30 tag devices are operated in the area where RTLS is to be provided through AP1, AP2, AP3, and AP4, each tag device is provided with unique identification information of one of 30 different values from Index 0 to Index 29 Can be uniquely assigned.
According to an embodiment of the present invention, an operation method of the
For example, if Index 3 is assigned as the unique identification information to the
The method of operation of the
In this case, the other tag devices 2, 3, ... receiving the synchronization signal also have the same timing as the above-mentioned equation (1) (T transmission = T + X) using the unique identification information (Index X) of the synchronization signal and the transmission timing When it reaches the time point (T transmission = T + X) delayed by the time X, it will generate a tag signal and transmit it to AP1, AP2, AP3, AP4.
Thus, each of the tag apparatus 100 (same as the tag apparatus 1), the tag apparatuses 2, 3, ... determines the transmission time point of the tag signal by using the inter-AP synchronization signal, At a distributed point in time.
AP1, AP2, AP3 and AP4 receive the tag signals of the tag device 100 (same as the tag device 1), the tag devices 2, 3, 1), and the tag apparatuses 2, 3, ..., respectively (S130).
That is, AP1, AP2, AP3, and AP4 are time information for receiving the tag signal for each tag device (same as tag device 1, 100), tag device 2, (Not shown), the positioning server (not shown) performs a positioning procedure for providing the device information to a positioning server (not shown). In accordance with the information provided from AP1, AP2, AP3, The tag signals can be measured (grasped) on the basis of the time difference received by the tag signals AP1, AP2, AP3 and AP4, respectively.
According to another embodiment of the present invention, an operation method of the
The method of operation of the
For example, when it is assumed that 10 ms is set as a transmission margin (Safe Margin), 2 ms is set as a transmission interval (Tag Term), and Index 3 is assigned as unique identification information to the
The operation method of the
At this time, the other tag apparatuses 2, 3, ... receiving the sync signal also have the following relationship according to the present invention: Equation (3) (T transmission = T + 10 + (2 x Index X)) using the unique identification information (Index X), Safe Margin (10 ms) and Tag Term (2 ms) (T transmission = T + 10 + (2 x X)) delayed by a delay time (10+ (2 x Index X)) according to different unique identification information (Index X) , And generates a tag signal and transmits it to AP1, AP2, AP3, and AP4.
Thus, each of the tag apparatus 100 (same as the tag apparatus 1), the tag apparatuses 2, 3, ... determines the transmission time point of the tag signal by using the inter-AP synchronization signal, At a distributed point in time.
AP1, AP2, AP3 and AP4 receive the tag signals of the tag device 100 (same as the tag device 1), the tag devices 2, 3, 1), and the tag apparatuses 2, 3, ..., respectively (S130).
Thereafter, the method of operation of the
The method of operation of the
For example, the method of operation of the
If it is determined that the synchronizing signal is not received (S100 No), the operation method of the
At this time, the operation method of the
The operation method of the
That is, if the synchronizing signal is not received so that the reception waiting time (for example, 10 minutes) elapses (S150 Yes), the operation method of the
Although not shown in FIG. 3, the method of operation of the
INDUSTRIAL APPLICABILITY As described above, the method of operating the tag apparatus according to the present invention minimizes the collision of the tag signals that may occur in the AP, resolves the tag capacity reduction in the AP, which may be caused by the collision of the tag signals, It is possible to efficiently maximize the tag accommodating capacity in the AP.
The method of operation of the tag device according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
According to the tag apparatus and the operation method of the tag apparatus according to the present invention, in the tag-based positioning technique (TDOA positioning technology), since the tag accommodating capacity in the communication apparatus AP can be maximized, It is an invention that is industrially applicable because it is not only the use of related technology but also the possibility of market or operation of the applicable device as well as the possibility of being practically and practically obvious as it goes beyond the limit.
100: Tag device
110: signal receiving unit 120: transmission time determining unit
130: Tag signal transmitter
Claims (9)
A signal receiving unit for receiving a synchronization signal transmitted and received between different communication apparatuses located in the periphery of the tag apparatus;
A transmission time determining unit for determining a transmission time point different from a time point at which the synchronization signal is received and the unique ID information uniquely assigned to the tag device; And
And a tag signal transmitter for transmitting the tag signal to the communication device when the determined transmission time point is reached.
The transmission time determination unit may determine,
The transmission time point is determined by using a time point (T) at which the synchronization signal is received, unique identification information (Index X) uniquely assigned to the tag device, and a tag signal transmission interval (Tag Term) Wherein the tag device comprises:
Transmission time = T + (Tag Term x Index X)
The transmission time determination unit may determine,
(T), a unique identification information (Index X) uniquely assigned to the tag device, a predetermined transmission retention interval (Safe Margin), and a predetermined tag device transmission interval (Tag Term) To determine the transmission time point.
Transmission time = T + Safe margin + (Tag term x Index X)
The synchronizing signal includes:
And the specific communication device among the communication devices is a signal transmitted to the remaining communication devices every predetermined synchronization cycle.
The specific communication device is a master AP
And the remaining communication device is a slave AP.
Wherein the tag signal transmitter comprises:
Wherein the controller operates in a basic transmission mode in which the tag signal is transmitted every predetermined tag signal transmission period when the synchronization signal is not received so that the predetermined reception waiting time elapses.
A signal receiving step of receiving a synchronizing signal transmitted and received between different communication apparatuses located around the tag apparatus; And
A transmission time determining step of determining a transmission time point different from a time at which the synchronization signal is received and the unique ID information uniquely assigned to the tag device; And
And transmitting the tag signal to the communication device when the determined transmission time is reached.
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| KR1020150056041A KR101630808B1 (en) | 2015-04-21 | 2015-04-21 | Tag device and control method thereof |
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| KR1020150056041A KR101630808B1 (en) | 2015-04-21 | 2015-04-21 | Tag device and control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021848A (en) * | 2007-07-12 | 2009-01-29 | Denso Wave Inc | Rfid tag system, tag reader, and synchronizer |
| JP2011100209A (en) * | 2009-11-04 | 2011-05-19 | Nec Corp | Ic tag management system |
| KR101221446B1 (en) * | 2010-12-14 | 2013-01-11 | 한국전자통신연구원 | Method and apparatus for controlling reader in radio frequency identification system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009021848A (en) * | 2007-07-12 | 2009-01-29 | Denso Wave Inc | Rfid tag system, tag reader, and synchronizer |
| JP2011100209A (en) * | 2009-11-04 | 2011-05-19 | Nec Corp | Ic tag management system |
| KR101221446B1 (en) * | 2010-12-14 | 2013-01-11 | 한국전자통신연구원 | Method and apparatus for controlling reader in radio frequency identification system |
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