Method and apparatus for estimating position in wireless communication system

The present disclosure relates to a communication technique for combining a 5G communication system for supporting a higher data transmission rate than a 4G system with an IoT technology, and a system therefor. The present disclosure can be applied to 5G communication technology and IoT related technology-based intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety related services, etc.). A method in which a transmitter estimates a position in a communication system according to an embodiment of the present disclosure comprises the steps of: transmitting, to a receiver, a magnetic field signal generated from a single coil included in the transmitter; and receiving, from the receiver, position information estimated on the basis of a received signal strength of the magnetic field signal.

CROSS-REFERENCE TO RELATED APPLICATION(s)

This application is a 371 U.S. National Stage of International Patent Application No. PCT/KR2016/009452 filed on Aug. 25, 2016, which claims priority to Korean Patent Application No. 10-2015-0119641 filed on Aug. 25, 2015, each of which are incorporated herein by reference into the present disclosure as if fully set forth herein.

TECHNICAL FIELD

The present disclosure generally relates to a method and apparatus for estimating a position in a communication system, and more particularly, to a method and apparatus for estimating a position of a terminal based on a magnetic field signal.

BACKGROUND

Efforts have been made to develop an improved 5th-Generation (5G) communication system or a pre-5G communication system to meet the increasing demand for wireless data traffic after the commercialization of 4th-Generation (4G) communication system. For this reason, the 5G communication system or the pre-5G communication system is called a beyond 4G network communication system after 4G network or a post LTE system after an LTE system.

In order to achieve a higher data transmission rate, 5G communication systems are being considered for implementation in ultra-high frequency (mmWave) bands (for example, 60 GHz bands). In order to mitigate the path loss of radio waves in the ultra-high frequency bands and to increase the propagation distance of the radio waves, in the 5G communication system, beamforming, massive multi-input multi-output (massive MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large scale antenna technologies are being discussed.

In addition, in order to improve the network of a system, in the 5G communication system, technologies such as an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, Device to Device communication (D2D), wireless backhaul, a moving network, cooperative communication, Coordinated Multi-Points (CoMP), interference cancellation, and the like are being developed.

In addition in the 5G system, Hybrid FSK and QAM Modulation (FQAM) and Sliding Window Superposition Coding (SWSC), which are Advanced Coding Modulation (ACM) schemes, Filter Bank Multi-Carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA), which are advanced access schemes, and the like are being developed.

On the other hand, the Internet has evolved into an Internet of Things (IoT) network in which information is exchanged between distributed components such as objects, in a human-centered connection network where humans generate and consume information. Internet of Everything (IoE) technology, which combines IoT technology with big data processing technology through connection with cloud servers, is also emerging. In order to implement IoT, technology elements such as sensing technology, wired/wireless communication, network infrastructure, service interface technology, and security technology are required. In recent years, technologies such as sensor network, Machine to Machine (M2M), Machine Type Communication (MTC), etc., for connection between objects have been studied. In an IoT environment, an intelligent Internet Technology (IT) service can be provided that collects and analyzes data generated from connected objects to create new value in human life. IoT can be applied to fields such as smart home, smart building, smart city, smart car or connected car, smart grid, health care, smart home appliance, advanced medical service, etc., through the convergence and combination of existing information technology (IT) and various industries.

Accordingly, various attempts have been made to apply the 5G communication system to the IoT network. For example, technologies such as a sensor network, M2M, MTC, etc., are implemented by the 5G communication technologies such as beamforming, MIMO, array antenna, etc. To apply the cloud RAN as the above-described big data processing technology may be an example of the convergence of 5G technology and IoT technology.

Recently, position-based services using the position of a terminal have attracted much attention due to the rapid spread of smart terminals. The position estimation in an indoor environment can be utilized in various ways such as position awareness and route guidance of a terminal within a large building or shopping mall, guidance to the position of a parked car in a large parking lot, rescue inside a large building in case of disaster such as fire or earthquake, and the like.

In such an indoor environment, the accuracy of the position estimation of the terminal is highly likely to be degraded due to interference signals to people and surrounding obstacles. Therefore, in order to secure the accuracy of a short distance (for example, 5 m) in a communication system, a plurality of Access Points (APs) must be installed within a certain range (for example, 10 m). However, when a plurality of APs is installed in the communication system, the installation cost increases and an algorithm for estimating the position of the terminal may be complicated. Therefore, there is a need for a method of increasing the accuracy of the position estimation of a terminal using one AP in a communication system.

SUMMARY

According to aspects of the present disclosure, a method and apparatus for estimating a position of a terminal based on a magnetic field signal are provided.

In addition, according to aspects of the present disclosure, a method and apparatus for estimating a position of a terminal including a coil for generating a magnetic field signal in a communication system using the terminal and an access point (AP) are provided.

In accordance with an aspect of the present disclosure, a method in which a transmitter performs position estimation in a communication system, includes: transmitting a magnetic field signal generated from one coil included in the transmitter to a receiver; and receiving position information of the transmitter estimated based on a Received Signal Strength (RSS) of the magnetic field signal from the receiver.

In accordance with another aspect of the present disclosure, a method in which a receiver performs position estimation in a communication system, includes: receiving a magnetic field signal from a transmitter through three coils having orientations orthogonal to each other; measuring an RSS of the magnetic field signal; estimating a position of the transmitter based on the RSS; and transmitting information about the estimated position to the transmitter.

In accordance with still another aspect of the present disclosure, a transmitter of which a position is estimated in a communication system includes: a control unit that controls a magnetic field signal generated from one coil included in the transmitter to be transmitted to a receiver and ascertains position information estimated based on an RSS of the magnetic field signal received from the receiver; and a transmission/reception unit that transmits the magnetic field signal to the receiver and receives the position information from the receiver.

In accordance with yet another aspect of the present disclosure, a receiver that estimates a position of a transmitter in a communication system includes: a reception unit that receives a magnetic field signal through three coils having different orientations; a control unit that measures an RSS of the magnetic field signal and estimates the position of the transmitter based on the RSS; and a transmission unit that transmits information about the estimated position to the transmitter.

DETAILED DESCRIPTION

Hereinafter, an exemplary embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, it should be noted that only portions required for comprehension of operations according to the embodiments of the present disclosure will be described and descriptions of other portions will be omitted not to make subject matters of the present disclosure obscure.

The main point of the present disclosure is that each of a transmitter and a receiver transmits and receives a magnetic field signal using a coil and the receiver estimates a position of a terminal (i.e., transmitter) based on Received Signal Strength (RSS) of the magnetic field signal.

To this end, a method and apparatus for estimating a position of a terminal in a communication system according to an embodiment of the present disclosure will be described in detail.

FIG. 1illustrates a configuration of a communication system according to an embodiment of the present disclosure.

Referring toFIG. 1, the communication system according to an embodiment of the present disclosure includes a terminal100, an Access Point (AP)130, and a server150. Here, the terminal100may be implemented as a transmitter, and the AP130and the server150may be implemented as a receiver as a single unit. The server150may be a position estimation server.

The terminal100includes a coil (inductor)110for generating a magnetic field signal in an internal transmission module. Here, the coil110is used for Near Field Communication (NFC) and Wireless Power Transfer (WPT), and resonates at a specific frequency f0. Here, the terminal100may be a terminal capable of data and voice communication such as in a cellular phone, or a terminal (e.g., a tag type terminal) that performs only position estimation.

When detecting an event requesting position estimation, the terminal100transmits a magnetic field signal generated from the coil110to the AP130.

At this time, the terminal100may detect an event requesting the position estimation according to predetermined information. For example, when the terminal100recognizes that a specific application (app) requiring position estimation is executed or it has entered a specific place, the terminal100may detect an event requesting position estimation. As another example, when the terminal100is a tag type terminal only for position estimation, the terminal100may detect an event requesting position estimation every predetermined period.

In order to notify the AP130that the magnetic field signal transmitted to the AP130belongs to the terminal100, the terminal100may transmit the magnetic field signal to the AP130, and at the same time, may also transmit information on an identifier of the terminal100to the AP130. As another example, the terminal100may transmit the information on the identifier of the terminal100to the AP130before transmitting the magnetic field signal, and may transmit, when receiving a signal transmission request from the AP130, the magnetic field signal to the AP130. Obviously, the AP130can identify the terminal100in a method other than the above-described method.

The AP130receives the magnetic field signal from the terminal100through three coils131,133, and135having different orientations. Here, each of the three coils131,133, and135may have one of x-axis orientation, y-axis orientation, and z-axis orientation. In particular, one of the three coils131,133, and135may have an orientation orthogonal to the remaining two coils. The three coils131,133, and135may be included in the AP130or may be connected to (that is, attached to) the outside. Alternatively, only some of the three coils may be included in the AP130or may be connected to the outside.

The AP130may calculate a received signal strength indication (RSSI) of the magnetic field signal received from the terminal100based on the magnetic field signals received from the respective orientations. For example, the AP130may calculate the RSSI based on the magnetic field signals received in each orientation as shown in Equation 1 below.

In Equation 1, HRdenotes an RSSI of the magnetic field signal received from the terminal100, Hxdenotes a signal received through the coil in the x-axis orientation, Hydenotes a signal received through the coil in the y-axis orientation, and Hzdenotes a signal received through the coil in the z-axis orientation.

The AP130transmits information about the RSSI to the server150or the terminal100. In this case, when the terminal100receives the RRSI information from the AP130, it is possible to estimate the position of the terminal100in the same manner as that in the server150.

The server150receives the measured RSSI information from the AP130and calculates a distance between the terminal100and the AP130according to the received RSSI information. Next, the server150estimates the position of the terminal100using information about the calculated distance and information about a built-in map. Here, when estimating the position of the terminal100, the server150may more accurately estimate the position of the terminal100using information for position estimation received from another AP other than the AP130. The server150transmits information about the estimated position of the terminal100to the terminal100.

Meanwhile, the RSSI information measured from Equation 1 in the AP130is information that does not consider an orientation between the AP130and the terminal100. When the server150calculates the distance between the AP130and the terminal100using the RSSI information that does not consider the orientation between the AP130and the terminal100, an error may occur in calculating the distance.

For example,FIG. 2is a graph illustrating distance information calculated in accordance with the orientation of a terminal according to an embodiment of the present disclosure.

InFIG. 2, an angle (theta) between the terminal (i.e., transmitter) and the AP (i.e., receiver) varies depending on the orientation of the terminal.

Referring toFIG. 2, when a distance between the AP130and the terminal100is calculated by changing the orientation of the terminal, it can be confirmed that a distance error of up to 13% may be generated according to the orientation of the terminal. Accordingly, in order to improve the accuracy of position estimation, an embodiment of the present disclosure proposes a method and an apparatus in which the AP130measures an RSSI in consideration of an orientation between the terminal100and the AP130.

For example, objects through which a magnetic field signal cannot be transmitted in an indoor environment may be a ceiling and a floor. In this case, the AP130cannot receive the magnetic field signal transmitted by the terminal100as it is, but may receive the magnetic field signal deformed (i.e., including an interference signal) by the ceiling or floor in which the AP130is installed. That is, as shown inFIGS. 3 and 5, when even the same terminal100is connected to the AP130in a different orientation, the AP130may receive another magnetic field signal.

FIGS. 3 and 6show an example in which an AP receives a magnetic field signal according to the orientation of a terminal in a communication system according to an embodiment of the present disclosure. InFIGS. 3 to 6, the AP includes only a coil in the z-axis orientation.

Referring toFIG. 3, when a terminal310is positioned perpendicular to the ceiling in a room, the magnetic field signal of the terminal310is transmitted to an AP320through an XY plane, so that the AP320can receive the magnetic field signal transmitted from the terminal310through the XY plane. In this case, since the magnetic field signal transmitted from the terminal310does not pass through a z-axis plane, the AP does not receive interference caused by the ceiling above a certain threshold value. From this, when the terminal310is positioned perpendicular to the ceiling, the AP320may receive the magnetic field signal having a low deformation rate among the magnetic field signals transmitted from the terminal310. Accordingly, since the AP320calculates the RSSI using the magnetic field signal having a low deformation rate which is almost the same as the magnetic field signal from the terminal310, a probability that an error occurs in the distance information calculated based on the RSSI may be lower than a predetermined threshold value.

FIG. 4is a graph illustrating an error of a distance calculated based on the RSSI by the AP when a terminal is positioned perpendicular to the ceiling in a door as shown inFIG. 3.

InFIG. 4, a beacon401performs the function of the AP.FIG. 4shows an error calculated by measuring the position of the terminal between a table405and the beacon401at intervals of about 4 m in the x-axis and about 2.5 m in the y-axis. Referring toFIG. 4, errors of the distance calculated by the beacon401based on the RSSI are all 5 m or less, except for one specific point403. In other words, according to the present disclosure, it is possible to perform position estimation with an error of 5 m or less only using one receiver, that is, the beacon401, in an area of 27.5 m×13.1 m.

However, as shown inFIG. 5, when the terminal510is positioned in parallel with the ceiling in a room, the magnetic field signal of the terminal510is transmitted to an AP520through an XZ plane or an YZ plane, so that the AP520may receive the magnetic field signal transmitted from the terminal510through the XZ plane or the YZ plane. In this case, since the magnetic field signal transmitted from the terminal510passes through a Z-axis plane, the AP520may receive interference caused by the ceiling above a predetermined threshold value. From this, when the terminal510is positioned in parallel with the ceiling, the AP520may receive the magnetic field signal having a high deformation rate among the magnetic field signals transmitted from the terminal510. Accordingly, since the AP520calculates the RSSI using the magnetic field signal having a high deformation rate among the magnetic field signals transmitted from the terminal510, a probability that an error occurs in the distance information calculated based on the RSSI may be higher than a predetermined threshold value.

FIG. 6is a graph illustrating an error of a distance calculated based on the RSSI by the AP when a terminal is positioned in parallel with the ceiling in a room as shown inFIG. 5.

InFIG. 6, a beacon601performs the function of the AP. The beacon601represents an error calculated by measuring the position of the terminal at intervals of about 4 m in the x-axis and about 2.5 m in the y-axis in the same manner as that inFIG. 4. Referring toFIG. 6, an error of a distance calculated based on the RSSI by the beacon601is 5 m or more at 50% or more of the number of measured terminals.

Accordingly, the AP520according to the embodiment of the present disclosure may estimate an accurate position of the terminal510by measuring the RSSI after modifying the magnetic field signal received from the terminal510to be the same as the magnetic field signal transmitted by the terminal510.

To this end, hereinafter, an example in which three coils are attached to a ceiling existing in a room will be described, and a method in which the AP520calculates the RSSI by modifying the received magnetic field signal will be described.

FIG. 7is a diagram illustrating an example in which three coils are attached to a ceiling existing in a room according to an embodiment of the present disclosure.

In the embodiment ofFIG. 7, it is assumed that the three coils are attached to the ceiling, but obviously, the embodiment of the present disclosure can be applied to a case in which the coils are attached to a floor.

Referring toFIG. 7, a coil701in an x-axis orientation and a coil703in a y-axis orientation may be included in an AP710, and a coil705in a z-axis orientation may be connected to the outside of the AP710.

Specifically, the coil705in the z-axis orientation is a sheet type coil in the z-axis having a tile size of a ceiling, and may be configured to occupy a larger area than the AP710. The coil705in the z-axis orientation may be installed to be included in a ceiling tile or may be installed as a transparent sheet on a tile surface. As another example, the coil705in the z-axis orientation may be attached to a ferrite sheet attached to the ceiling.

The coil701in the x-axis orientation and the coil703in the y-axis orientation included in the AP710may be installed on each of two orthogonal ferrite rods.

The AP710may receive a magnetic field signal from a terminal using the three coils configured as shown in the embodiment ofFIG. 7.

As described above, the AP710measures the RSSI after modifying the magnetic field signal received from the terminal, taking into consideration that the magnetic field signal received from the terminal may be deformed.

As an example, the AP710according to the embodiment of the present disclosure may calculate the RSSI by applying, to a signal received from the coil in the z-axis orientation, height information (h) from a specific position to an installation position of the AP710in order to modify the signal received from the coil in the z-axis orientation, as shown in the following Equation 2. Here, the specific position may be a position corresponding to, for example, the floor.
|Hmodified|=√{square root over (Hx2+Hy2+k(h)×Hz2)}  Equation 2

In Equation 2, Hmodifieddenotes an RSSI for a magnetic field signal modified by the AP710, k(h) denotes an empirical value according to the height information (h), which may be set differently depending on a place where the AP710is installed.

As another example, when the AP710according to the embodiment of the present disclosure receives, from the terminal, orientation information (i.e., an angle) about the orientation between the terminal and the AP710, the AP710may modify the magnetic field signal received from the terminal using the height information (h) from the specific position to the installation position of the AP and information about the orientation of the terminal, as shown in the following Equation 3.
|Hmodified|=(1+k(h)sin θ)×|Hreceived|  Equation 3

In Equation 3, Hreceiveddenotes an RSSI for the magnetic field signal which the AP710receives from the terminal, Hmodifieddenotes an RSSI for a magnetic field signal obtained such that the AP710modifies the height information (h) about the position of the AP710and the information about the orientation of the terminal (i.e., horizontal level (degree) of the terminal and the ground).

As described above, when the AP710calculates the RSSI by modifying the magnetic field signal received from the terminal using Equation 2 and Equation 3, a probability that an error occurs in information about the calculated distance is lowered.

FIG. 8is a graph illustrating an error of a distance calculated by an AP based on an RSSI for the magnetic field signal modified according toFIG. 7.

InFIG. 8, a beacon801performs the function of the AP. The beacon801represents an error calculated by measuring the position of the terminal at intervals of about 4 m in the x-axis and about 2.5 m in the y-axis in the same manner as those inFIGS. 4 and 6.

The beacon801includes three coils as described above inFIG. 7and calculates a modified RSSI using Equation 3.

Referring toFIG. 8, when the beacon801uses the RSSI information calculated from Equation 3, it can be seen that the error has been significantly reduced compared toFIG. 6.

FIG. 9shows a method in which a transmitter performs position estimation in a communication system according to an embodiment of the present disclosure. Referring toFIG. 9, the transmitter may correspond to the terminal100requesting the position estimation.

Referring toFIG. 9, in operation901, the transmitter detects an event requesting position estimation. For example, when recognizing that a specific application on which position estimation is required is executed or the transmitter enters a specific place, the transmitter may detect an event requesting position estimation. As another example, when the transmitter is a tag type terminal only for position estimation, the transmitter may detect an event requesting position estimation every predetermined period.

Next, in operation903, the transmitter transmits a magnetic field signal generated from a coil to a receiver. At this time, in order to notify the receiver that the transmitted magnetic field signal belongs to the transmitter, the transmitter may transmit the magnetic field signal to the receiver, and at the same time, may also transmit information about an identifier of the transmitter to the receiver. As another example, the transmitter may transmit the information about the identifier of the transmitter to the receiver before transmitting the magnetic field signal, and may transmit, when receiving a signal transmission request from the receiver, the magnetic field signal to the receiver. In addition, obviously, the receiver can identify the transmitter in a method other than the above-described method.

Next, in operation905, the transmitter receives a response message including the RSSI information and the position information from the receiver. Next, in operation907, the transmitter ascertains whether the RSSI information is included in the response message. In operation909, when the RSSI information is not included in the response message (i.e., when the position information is included), the transmitter ascertains the position information included in the response message. On the other hand, in operation911, when the RSSI information is included in the response message, the transmitter ascertains the RSSI information included in the response message, calculates a distance between the transmitter and the receiver based on the RSSI information, and performs position estimation according to the calculated distance information using a map stored therein.

FIG. 10shows a method in which a receiver performs position estimation in a communication system according to an embodiment of the present disclosure.

Here, the receiver may correspond to the AP130or the server150ofFIG. 1which receives a request for the position estimation.

Referring toFIG. 10, in operation1001, the receiver receives a magnetic field signal requesting position estimation from a transmitter. Here, the magnetic field signal may be received through three coils included inside or outside the receiver, or may be received wirelessly from the three coils included in a separate infrastructure device (e.g., a beacon for localization).

Next, in operation1003, the receiver calculates an RSSI for the magnetic field signal using Equation 2 or Equation 3. Here, it is assumed that the receiver has already received information (i.e., at least one piece of information of height information and orientation information) required in Equation 2 and Equation 3 from the transmitter.

Next, in operation1005, the receiver determines whether to transmit the measured RSSI information to the transmitter according to setting information of the communication system. In operation1007, when the receiver determines to transmit the measured RSSI information to the transmitter, the receiver transmits a response message including the measured RSSI information to the transmitter. On the other hand, in operation1009, when the receiver determines not to transmit the measured RSSI information to the transmitter, the receiver calculates a distance between the transmitter and the receiver based on the measured RSSI information. Next, in operation1011, the receiver estimates the position of the transmitter according to the calculated distance in a map stored therein. Accordingly, the receiver may transmit the response message including the estimated position information to the transmitter.

Meanwhile, the position estimation process between the receiver and the transmitter according to an embodiment of the present disclosure may be terminated when an end event for the position service is detected or when the transmitter leaves a specific place.

FIG. 11shows a detailed device configuration in which a transmitter according to an embodiment of the present disclosure performs position estimation.

Referring toFIG. 11, the transmitter may include a transmission unit1111, a reception unit1113, a control unit1130, an input unit1151, an output unit1153, a storage unit1170, and a signal generation unit1190in order to perform position estimation. Here, the transmission unit1111and the reception unit1113may be configured as one transmission/reception unit1110, and the input unit1151and the output unit1153may be also configured as one input/output unit1150.

First, the signal generation unit1190includes a coil having one axis according to an embodiment of the present disclosure.

FIGS. 12A to 12Cshow a coil connected to a transmitter according to an embodiment of the present disclosure as one example.

Referring toFIG. 12A, a coil1201is included in a metal frame1203configured outside the transmitter. Referring toFIG. 12B, the coil1201may connect a part of the coil1201to the metal frame1203to increase the area of the coil1201as shown in a section1207ofFIG. 12B. In addition, referring toFIG. 12C, the signal generation unit1190may further include a capacitor1205so that a magnetic field signal generated in the coil1201of the transmitter is accurately transmitted to the receiver. The capacitor1205is connected to the metal frame and operates as a repeater resonator to form a resonant loop at the same frequency F0as that of the coil1201.

The input unit1151detects an event requesting position estimation according to an embodiment of the present disclosure. The input unit1151may include a gyro sensor for measuring an angle between the transmitter and the receiver.

The control unit1130controls the overall operation of the transmitter, and in particular, controls operations related to an operation of estimating the position by the transmitter according to an embodiment of the present disclosure. Here, the operations related to the operation of estimating the position by the transmitter according to the embodiment of the present disclosure are the same as those described with reference toFIGS. 1 to 9, and thus, a detailed description thereof will be omitted here.

The transmission unit1111transmits various signals and various messages to the receiver under the control of the control unit1130. Here, the various signals and various messages transmitted by the transmission unit1111are the same as those described with reference toFIGS. 1 to 9, and thus, a detailed description thereof will be omitted here.

In addition, the reception unit1113receives various signals and various messages from the receiver under the control of the control unit1130. Here, the various signals and various messages received by the reception unit1113are the same as those described with reference toFIGS. 1 to 9, and thus, a detailed description thereof will be omitted here.

The storage unit1170stores programs and a variety of information related to the operation of estimating the position by the transmitter according to the embodiment of the present disclosure under the control of the control unit1130.

The output unit1153outputs various signals and various messages related to the operation of estimating the position by the transmitter according to the embodiment of the present disclosure, under the control of the control unit1130. Here, the various signals and various messages output by the output unit1153are the same as those described with reference toFIGS. 1 to 9, and thus, a detailed description thereof will be omitted here.

Meanwhile,FIG. 11shows a case in which the transmitter is implemented with separate units such as the transmission/reception unit1110, the control unit1130, the input/output unit1150, the storage unit1170, and the signal generation unit1190. However, obviously, the transmitter can be implemented in a form in which at least two of the transmission/reception unit1110, the control unit1130, the input/output unit1150, the storage unit1170, and the signal generation unit1190are integrated. In addition, the transmitter can be implemented as a single processor.

FIG. 13shows a detailed device configuration in which a receiver according to an embodiment of the present disclosure performs position estimation.

Referring toFIG. 13, the receiver may include a control unit1310, a storage unit1330, a transmission unit1351, and a reception unit1353in order to receive a magnetic field signal from a transmitter and estimate the position of the transmitter. Here, the transmission unit1351and the reception unit1353may be configured as one transmission/reception unit1350.

The control unit1310controls the overall operation of the receiver, and in particular, controls operations related to an operation of estimating the position by the receiver according to an embodiment of the present disclosure. The operations related to the operation of estimating the position by the receiver according to an embodiment of the present disclosure are those described with reference toFIGS. 1 to 10, and thus a detailed description thereof will be omitted here.

The transmission unit1351transmits various signals and various messages to the transmitter under the control of the control unit1310. Here, the various signals and various messages transmitted by the transmission unit1351are the same as those described with reference toFIGS. 1 to 10, and thus, a detailed description thereof will be omitted here.

In addition, the reception unit1353receives various signals and various messages from the transmitter under the control of the control unit1310. The various signals and various messages received by the reception unit1353are the same as those described with reference toFIGS. 1 to 10, and thus, a detailed description thereof will be omitted here.

The storage unit1330stores programs and a variety of information related to the operation of estimating the position by the receiver according to an embodiment of the present disclosure, under the control of the control unit1310. In addition, the storage unit1330stores the various signals and various messages which the reception unit1353receives from the transmitter.

Meanwhile,FIG. 13shows a case in which the receiver is implemented with separate units such as the transmission/reception unit1350, the control unit1310, and the storage unit1330. However, obviously, the receiver can be implemented in a form in which at least two of the transmission/reception unit1350, the control unit1310, and the storage unit1330are integrated. In addition, obviously, the transmitter can be implemented as a single processor.

Therefore, the transmitter may be provided with position-based service information based on precisely estimated position information from the receiver according to the embodiment of the present disclosure. Here, the position-based service includes an indoor navigation service, a position-based advertisement service, a product information service, an acquaintance finding service, and a missing child (distress) location finding service, and the like. In addition, when the transmitter is composed of a tag, the receiver according to the embodiment of the present disclosure can effectively provide an asset management service, a position-based service for staff management, and the like to a manager terminal managing the transmitter.