KR20230019803A - Method and apparatus for positioning mobile station using wireless communications - Google Patents

Abstract

The present disclosure discloses a signal measuring device, which includes: a first communication unit using a first communication method; a second communication unit using a second communication method; and a control unit exchanging link formation or channel setting information for positioning using the second communication method of a target terminal with the target terminal through the first communication unit, measuring a signal of the second communication method transmitted by the target terminal based on the link formation or channel setting information, and calculating the location of the target terminal based on the measurement result or transmitting the measurement result to a location measurement server through the first communication unit.

Description

Method and apparatus for measuring position of terminal using wireless communication {METHOD AND APPARATUS FOR POSITIONING MOBILE STATION USING WIRELESS COMMUNICATIONS}

The present disclosure relates to a technique for securing location information of a terminal.

A mobile communication system is composed of a base station and a terminal. The conventional terminal location estimation method estimates the position of a corresponding terminal based on a signal transmitted by the terminal. At this time, a commonly used method is to use a delay value of a signal transmitted by a terminal to reach a base station. In addition, the distance between the base station and the terminal can be estimated based on the amount of propagation attenuation generated in the channel through which the signal transmitted by the terminal arrives at the base station. In other words, in the conventional method of estimating the position of a terminal in a mobile communication system, a base station receives a signal transmitted by a terminal, and estimates the position of the terminal based on a delay on a radio channel of the received signal and radio wave attenuation.

In order to measure more accurately than the conventional location estimation method of a terminal, a signal measurer for measuring the location of a terminal based on an uplink signal transmitted by a mobile communication terminal and a method for calculating the location of a terminal based on the measurements Various techniques have been proposed. In addition to the method of using the mobile communication device included in the terminal, it is also necessary to design a method of utilizing an unlicensed band communication device such as WIFI or Bluetooth or an ultra-wideband communication device such as UWB.

The present disclosure proposes a method of measuring a location of a terminal by utilizing WIFI, Bluetooth, or UWB included in a terminal in addition to a method of measuring the location of a terminal by utilizing an uplink signal of mobile communication. According to this method, it is possible to measure the location of a terminal in a shadow area of mobile communication or an area where a mobile communication-based signal measurer does not operate. In addition, since it is possible to utilize a band without a license unlike a mobile communication system, it may be possible to measure the location of a terminal at a low cost.

An embodiment devised to solve the above problems is a first communication unit using a first communication method, a second communication unit using a second communication method, and whether or not a link is formed or a channel for positioning using the second communication method of a target terminal. Setting information is exchanged with the target terminal through the first communication unit, a signal of the second communication method transmitted by the target terminal is measured based on whether a link is formed or channel setting information is transmitted through the second communication unit, and based on the measurement result, the target terminal It is possible to provide a signal measuring device including a controller that calculates the location of a terminal or transmits a measurement result to a location measurement server through a first communication unit.

In addition, another embodiment exchanges information on whether position measurement is performed with a signal measurer through the third communication unit using the third communication method, the second communication unit using the second communication method, and the third communication unit, and requesting location measurement. Including a control unit for outputting a signal of the second communication method through the second communication unit and transmitting whether the signal of the second communication method is output or channel setting information of the second communication method to the signal meter through the third communication unit. terminal can be provided.

In addition, another embodiment outputs a signal of the communication method through the communication unit when the location measurement for the communication unit and the target terminal using a communication method using an unlicensed band or ultra wide band (UWB) is determined. , It is possible to provide a signal generator including a control unit capable of controlling to output signals of a communication method at two or more different places.

In addition, another embodiment searches for a signal of a communication method using an unlicensed band or ultra wide band (UWB) output by a signal generator when location measurement of the communication unit and the target terminal is determined. To provide a positioning server including a control unit that transmits a command to a target terminal, receives a measurement result of a signal of a communication method output from a signal generator from the target terminal, and calculates the location of the target terminal based on the measurement result. can

The location measurement method proposed in the present disclosure acquires identification information of an unlicensed band communication device or ultra-wideband communication device installed in a terminal to be measured, and measures a communication signal of the identification information using the communication method. and acquiring location information of the target terminal based on the measurement. To this end, the signal meter is equipped with a communication device for unlicensed band or an ultra-wideband communication device. In addition, the signal measurer obtains identification information of a terminal that is a target of location measurement, and determines whether a received signal is a signal of a target terminal.

According to the present disclosure, a signal transmitted from an unlicensed band communication device or an ultra-wideband communication device installed in a mobile communication terminal may be measured, and the location of the terminal may be measured based on the measured signal. Through this, it is possible to measure the position of the terminal in the shadow area of mobile communication. In addition, since a licensed band is not used, location measurement may be possible at a low price.

1 is a diagram illustrating the concept of positioning using a mobile communication uplink signal.
2 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to an embodiment of the present disclosure.
3 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to another embodiment of the present disclosure.
4 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to another embodiment of the present disclosure.
5 and 6 are diagrams illustrating examples of operating two different communication methods according to an embodiment of the present disclosure.
7 is a flowchart for determining a communication method supporting positioning according to an embodiment of the present disclosure.
8 is a diagram illustrating implementation of a signal measurer according to an embodiment of the present disclosure.
9 is a diagram illustrating implementation of a signal measurer according to another embodiment of the present disclosure.
10 is a diagram illustrating implementation of a signal measurer according to another embodiment of the present disclosure.
11 is a flowchart illustrating a determination of a transmission setting of a signal according to an embodiment of the present disclosure.
12 is a flowchart for determining a transmission setting of a signal according to another embodiment of the present disclosure.
13 is a diagram showing the structure of a frame transmitted in WIFI according to an embodiment of the present disclosure.
14 is a diagram illustrating a structure of a frame transmitted in Bluetooth according to an embodiment of the present disclosure.
15 is a diagram illustrating a structure of a frame transmitted in a Bluetooth long range according to an embodiment of the present disclosure.
16 is a flowchart illustrating an operation of a receiver for measuring a signal according to an embodiment of the present disclosure.
17 is a diagram illustrating a configuration of a receiver for detecting and measuring a signal according to an embodiment of the present disclosure.
18 is a diagram illustrating configuration and connection between a signal measurer and a target terminal according to an embodiment of the present disclosure.
19 is a diagram showing the configuration of a signal measurer according to an embodiment of the present disclosure.
20 is a diagram illustrating a configuration of a terminal according to an embodiment of the present disclosure.
21 is a diagram showing the configuration of a signal generator according to an embodiment of the present disclosure.
22 is a diagram showing the configuration of a positioning server according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing the present disclosure, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description may be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing the components of the present disclosure. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element is directly connected or connectable to the other element, but there is another element between the elements. It will be understood that elements may be “connected”, “coupled” or “connected”.

Unless otherwise defined, all terms (including technical and scientific terms) used in this disclosure may be used in a meaning that can be commonly understood by those of ordinary skill in the art to which the embodiments of the present disclosure belong. . In addition, terms defined in commonly used dictionaries are not interpreted ideally or excessively unless explicitly specifically defined. In addition, terms to be described later are terms defined in consideration of functions in the embodiments of the present disclosure, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the content throughout this disclosure.

In this specification, a wireless communication system refers to a system for providing various communication services such as voice and packet data. A wireless communication system includes a user equipment (UE) and a base station (BS).

A user terminal is a comprehensive concept meaning a terminal in wireless communication, UE (User Equipment) in WCDMA, LTE, HSPA, and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) in GSM, UT (User Terminal), SS (Subscriber Station), wireless device (wireless device) should be interpreted as a concept that includes all.

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B, an evolved Node-B (eNB), a gNode-B (gNB), and a Low Power Node (LPN). ), sector, site, various types of antennas, BTS (Base Transceiver System), access point, point (eg, transmission point, reception point, transmission/reception point), relay node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), and small cell.

Since the various cells listed above have a base station controlling each cell, the base station can be interpreted in two meanings. 1) In relation to the radio area, it may be a device itself that provides a mega cell, macro cell, micro cell, pico cell, femto cell, or small cell, or 2) it may indicate the radio area itself. In 1), all devices providing a predetermined radio area are controlled by the same entity or all devices interacting to form a radio area cooperatively are directed to the base station. A point, transmission/reception point, transmission point, reception point, etc., according to a configuration method of a radio area, becomes an embodiment of a base station. In 2), the base station may indicate the radio area itself in which signals are received or transmitted from the viewpoint of the user terminal or the neighboring base station.

In the present disclosure, a cell may mean a component carrier having coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point (transmission point or transmission/reception point), and the transmission/reception point itself. can

In the present disclosure, a user terminal and a base station are used in a comprehensive sense as two (Uplink or Downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present disclosure, and are not limited by specific terms or words. don't In addition, a device for measuring the location of a target terminal in the present disclosure refers to a terminal or a separate device capable of measuring the location of a target terminal, and the device is not limited thereto.

Uplink (UL, or uplink) refers to a method of transmitting and receiving data to and from a base station by a user terminal, and downlink (DL, or downlink) refers to a method of transmitting and receiving data to and from a user terminal by a base station means

Uplink transmission and downlink transmission may use a Time Division Duplex (TDD) method that is transmitted using different times, a Frequency Division Duplex (FDD) method that is transmitted using different frequencies, a TDD method and an FDD method. Mixed methods may be used.

In the present disclosure, downlink may specify downlink transmitted through a frequency band transmitting resource allocation information and control information for uplink.

In addition, in a wireless communication system, standards are configured by configuring uplink and downlink based on one carrier or carrier pair.

In the uplink and downlink, control information is transmitted through a control channel such as a physical downlink control channel (PDCCH) and a physical uplink control channel (PUCCH), and a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH). It consists of the same data channel and transmits data.

Downlink may mean communication or a communication path from multiple transmission/reception points to a terminal, and uplink may mean communication or communication path from a terminal to multiple transmission/reception points. In this case, in the downlink, the transmitter may be a part of a multi-transmission/reception point, and the receiver may be a part of a terminal. Also, in uplink, a transmitter may be a part of a terminal, and a receiver may be a part of a multi-transmission/reception point.

Hereinafter, a situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be expressed as 'transmitting and receiving PUCCH, PUSCH, PDCCH, and PDSCH'.

Meanwhile, higher layer signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station performs downlink transmission to terminals. The base station is a physical downlink for transmitting downlink control information such as scheduling required for reception of a downlink data channel, which is a primary physical channel for unicast transmission, and scheduling grant information for transmission in an uplink data channel. control channel can be transmitted. Hereinafter, transmission and reception of signals through each channel will be described in the form of transmission and reception of the corresponding channel. The base station can transmit resource allocation information to the terminal through the PDCCH, and the base station also allocates resources to the terminal through the PDSCH. A control signal for signal transmission may be transmitted.

There is no limitation on multiple access schemes applied in wireless communication systems. Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Non-Orthogonal Multiple Access (NOMA), OFDM-TDMA, OFDM-FDMA, Various multiple access schemes such as OFDM-CDMA can be used. Here, NOMA includes SCMA (Sparse Code Multiple Access) and LDS (Low Density Spreading).

An embodiment of the present disclosure is directed to resource allocation such as asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 via GSM, WCDMA, and HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000, and UMB. can be applied

In the present disclosure, a machine type communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. Alternatively, in this specification, an MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and/or coverage enhancement.

In other words, in the present disclosure, the MTC terminal may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category/type that performs LTE-based MTC-related operations. Alternatively, in the present disclosure, the MTC terminal supports an improved coverage compared to the existing LTE coverage, or a UE category/type defined under the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost (or It may mean low complexity) UE category/type. Alternatively, it may mean a further enhanced MTC terminal defined in Release-14.

In the present disclosure, a NarrowBand Internet of Things (NB-IoT) terminal refers to a terminal supporting wireless access for cellular IoT. The objectives of NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low latency sensitivity, ultra-low terminal cost, low power consumption, and optimized network structure.

As representative usage scenarios in NR (New Radio), which is currently being discussed in 3GPP, eMBB (enhanced Mobile BroadBand), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communication) are being raised.

In the present disclosure, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals, and various messages related to NR (New Radio) can be interpreted in various meanings used in the past or currently used or in the future.

In the present disclosure, for convenience of description and understanding, LTE technology is mainly described, but the contents of the present disclosure may be equally applied to 5G NR. Accordingly, a subframe described below may be replaced with a slot in NR, and a TTI means one scheduling unit and may be replaced with a slot or minislot in NR. In addition, contents described based on LTE may be replaced with NR terms having the same function in 3GPP. In addition, the content of the present disclosure can be equally applied to a communication system newly introduced later as long as it does not contradict the technical idea.

Hereinafter, a method and apparatus for measuring a location of a terminal using wireless communication will be described with reference to related drawings.

In the present disclosure, an apparatus for measuring the location of a target terminal by acquiring an uplink signal of the target terminal is described as a device for measuring the location of the target terminal. However, these terms are for convenience of understanding, and may be replaced with terms such as information collection device, signal measurement device, signal measurer, or signal measurer as needed. That is, the aforementioned terms should be understood to refer to the same subject.

Meanwhile, in the present disclosure, technical ideas are described based on two nodes, a terminal and a base station, but this is only for convenience of understanding, and the same technical idea may be applied between terminals and terminals. For example, the base station described below is exemplarily disclosed and described as one node that communicates with a terminal, and can be replaced with another terminal or infrastructure device that communicates with the terminal as needed.

That is, the technical idea of the present disclosure may be applied not only to communication between a terminal and a base station, but also to communication between terminals (Device to Device), sidelink communication (Sidelink), and vehicle communication (V2X). In particular, it can be applied to communication between terminals in next-generation wireless access technology, and terms such as signal and channel of the present disclosure can be modified and applied in various ways according to the type of communication between terminals. In addition, various communications such as unlicensed band communications or ultra-wideband communications can be used.

For example, PSS and SSS may be applied after being changed to PSSS (Primary D2D Synchronization Signal) and SSSS (Secondary D2D Synchronization Signal) in inter-device communication, respectively. In addition, the channel for transmitting broadcast information, such as the aforementioned PBCH, is changed to PSBCH, the channel for transmitting data in the sidelink, such as PUSCH and PDSCH, is changed to PSSCH, and the channel for transmitting control information, such as PDCCH and PUCCH, is changed to PSCCH. and can be applied. Meanwhile, communication between devices requires a discovery signal, which is transmitted and received through PSDCH. However, it is not limited to these terms.

Hereinafter, in the present disclosure, communication between a terminal and a base station is described based on an example of the technical idea, but the base station node can be replaced with another terminal if necessary and the technical idea of the present disclosure can be applied.

The present disclosure relates to a method and apparatus for acquiring information on a location of a terminal in a wireless communication system, particularly a mobile communication system.

In the present disclosure, a new type of signal measurer having both a downlink signal receiver and an uplink signal receiver in a mobile communication system is proposed. The proposed signal measurer may include a plurality of uplink signal receivers, and the plurality of uplink signal receivers may be installed in different physical locations.

The signal measurer of the present disclosure can analyze downlink signals transmitted by a base station to obtain information on which signals are transmitted from a terminal to a base station through uplink. In addition, an uplink signal is received through an uplink signal receiver, it is determined whether the uplink data is transmitted from the terminal to the base station, and the position of the corresponding terminal can be determined based on the received signal or data.

In addition, the signal measurer of the present disclosure receives resource allocation and uplink transmission parameter information of a target terminal from a mobile communication system. And, the uplink signal is received through the uplink signal receiver, and based on this, the location of the terminal can be determined.

A related field of the present embodiments is a technology for acquiring location information of terminals in a wireless communication system.

Applicable products and methods of the present embodiments are location estimation of missing people through a mobile communication system and location estimation for lifesaving in case of disaster or distress.

The prior art most closely related to the present embodiments is a mobile communication system.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. And, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the content throughout this disclosure.

Meanwhile, the embodiments described below may be applied individually or in any combination.

In the mobile communication system of the present disclosure, a base station and a terminal exchange signals. The present disclosure arranges a signal measurer around a target terminal to track the location, the signal measurer receives an uplink signal of the target terminal and transmits information about the uplink signal to a positioning server, so that the positioning server We propose a location measurement system that measures the location of a terminal.

The signal measuring device of the present disclosure captures an uplink signal transmitted by a target terminal, and the location measurement server measures the location of the terminal based on this. In order to accurately measure the position of the target terminal, one or more of the signal measurers may be disposed around the target terminal. Although the signal measurer of the present disclosure can be carried and used by a person, it is also possible to use it by installing it in a vehicle or drone. In the present disclosure, the mobile communication system is described assuming an LTE-based mobile communication system, but it should be noted that it can be commonly applied to mobile communication systems to which other technologies are applied. In particular, it is possible to accurately measure the location of a terminal even in a GSM and W-CDMA type communication system, which is a circuit type mobile communication system among mobile communication systems. In addition, it can be applied to various wireless communication systems including other mobile communication systems.

The device for localization of the present disclosure is movable. In the conventional method, the device for position measurement was present at a fixed location, but in the present disclosure, there is an advantage that it can be carried and moved. Since the device of the present disclosure is movable, a person or object carrying the device of the present disclosure can move to a location closer to a target terminal to be measured. That is, since the user can get closer to the target terminal, more accurate location measurement of the target terminal is possible. In addition, it should be noted that the device of the present disclosure can be installed in a fixed location and used to accurately measure the location of a terminal.

To measure the location of a mobile communication terminal, a device and method for measuring the position of a terminal using a signal measurer having a downlink receiver and an uplink receiver of a mobile communication system have been proposed. The technology includes a controller that obtains time synchronization information of a mobile communication system through a downlink receiver and obtains resource allocation information for an uplink signal, and measures an uplink signal based on the uplink resource allocation information. , This is a technology for securing location information of a target terminal whose location is to be measured based on the measurement. The calculation of the location information can be calculated in the location measurement server based on the result measured by the signal measuring device.

The method for obtaining uplink resource allocation information of the target terminal in the above process may be obtained by receiving a downlink signal transmitted from the base station to the target terminal. In addition, the base station may transmit the signal to the signal measurer through a communication path separate from the downlink. In addition, resource allocation of the target terminal may be performed using resources previously agreed between the base station and the location measurement server or signal measurer.

1 is a diagram illustrating the concept of positioning using a mobile communication uplink signal.

1 shows the operation of a technique for measuring the location of a target terminal based on such a mobile communication uplink signal. 1, an uplink signal transmitted from the target terminal is measured using one or more signal measurers (100_1, 100_2, 100_3) around the target terminal 200 to measure the position, and based on the measurement, the target Calculate the location information of the terminal. 1 shows an embodiment in which the signal measurer transmits the measurement result to the location measurement server 400 and the location measurement server calculates the location information of the target terminal.

Referring to FIG. 1, in a mobile communication system, a base station 300 and a terminal 200 exchange signals with each other. The signal measurers 100_1, 100_2, and 100_3 of the present disclosure are disposed around a terminal (hereinafter referred to as a target terminal or target terminal) 200 to measure a position, receive a signal transmitted by the target terminal 200, and locate the position The measurement server 400 measures the position of the target terminal 200 based on this.

At this time, the position of the target terminal 200 is measured based on the delay of the signal transmitted by the target terminal 200 and the size of the received signal and the like reaching the respective signal measurers 100_1, 100_2, and 100_3.

In addition, the signal measurer may measure the position of the target terminal using the angle or direction at which the signal is received. As an example, the signal measurer may include one or more uplink signal receivers, and the signal measurer may combine angles or directions at which uplink signals are received from antennas connected to each uplink signal receiver, reception time, and received power information. Thus, the location of the target terminal can be measured.

As another example, the signal measurer may include one or more uplink signal receivers, and the signal measurer transmits angle or direction information at which an uplink signal is received from an antenna connected to each uplink signal receiver to a positioning server, The location measurement server may measure the location of the target terminal by combining the reception angle or reception direction information of the received signal, the reception time point, and the reception power information. A larger number of signal measurers can be placed around the target terminal 200 for more accurate location measurement.

For this measurement, a link must be formed between the base station and the target terminal so that the target terminal transmits uplink. In addition, even in the case of a target terminal that has already formed a link with a base station, the target terminal can be configured to transmit a signal promised in advance by the mobile communication network and the signal measurer for more accurate measurement. In the present disclosure, forming a link between a base station and a target terminal and setting the base station to transmit mutually promised signals to each other are defined as link formation for positioning.

The link establishment request between the target terminal and the base station may be directly requested by the signal measurer of the present disclosure to the mobile communication system. Alternatively, when the searcher transfers the request to the positioning server of the present disclosure, the positioning server may transmit the request to the mobile communication network, receive information on the link from the mobile communication network, and inform the signal measurer of the request.

In the above process, one of the signal measurers disposed near the target terminal becomes a master and can transmit a request for setting and canceling the link. In addition, as another method, all signal measurers may request establishment and termination of the link with the same authority.

In addition, the location measurement server can determine the location information of the target terminal and the signal measurer for the target terminal, and based on this, request to set up a call to the mobile communication network, or command the signal measurer to measure the signal for the target terminal. there is. That is, if the location measurement server determines the distance between the signal measurer and the target terminal and satisfies a predetermined condition, it can command link formation and signal measurement based on this. It may be that the signal measurer and the target terminal exist within a certain distance under a predetermined condition.

The signal measurers 100_1, 100_2, and 100_3 proposed in the present disclosure receive an uplink signal transmitted by a target terminal 200 in a mobile communication system and measure the size of the target terminal 200 based on the signal size and time delay information. perform localization. In order to acquire the timing at which the target terminal 200 transmits a signal in a mobile communication system, the signal measurers 100_1, 100_2, and 100_3 of the present disclosure include a downlink signal receiver, which is a signal transmitted by the base station 300. That is, the signal measurers 100_1, 100_2, and 100_3 of the present disclosure capture a forward signal (downlink signal) as a downlink signal receiver transmitted from a mobile communication system, and based on this, a reverse link signal (uplink signal) is transmitted estimate the time of

To this end, the signal measurer measures a downlink signal of a serving base station to which the target terminal is connected or a base station having time offset information with the serving base station, and detects an uplink signal of the target terminal based on this. That is, the signal measurer acquires a reference time point at which a reverse link signal is transmitted, and acquires and receives a reverse signal transmitted by the target terminal 200 around the reference time point. The downlink signal received by the signal measurer in the above process can be set to receive a frequency band for transmitting control information or channel setting information, specifically, resource allocation information to the target terminal.

In addition, the downlink signal receiver of the signal measurer receives a signal from a base station establishing a call with the target terminal. In this process, if necessary, the downlink signal receiving unit provided in the signal measurer may receive system information transmitted by the base station, such as BCCH (Broadcasting Control Channel) or BCH, to acquire general parameters of the system.

Using the above-described technique, it is possible to measure the location of a terminal within a mobile communication coverage. However, there are cases in which location measurement of a terminal outside the mobile communication coverage or in an area to which the above-described technology has not yet been applied is required. In addition, it is necessary to measure the position of a terminal at a low rate and cost in an unlicensed band, not in a licensed band.

In the present invention, information on a target terminal whose location is to be measured is secured in a mobile communication network, and then the information is transmitted to the signal measurer of the present invention to measure the position of the target terminal. The transmitted information may include identification information of an unlicensed band communication device of the target terminal or identification information of an ultra-wideband communication device. The identification information may be a MAC address of a WIFI or Bluetooth communication device. Another example may be a MAC address of an ultra-wideband communication device. As another example, it is also possible for a target terminal to be measured for location to transmit its own identification information to a signal measurer. In this process, the identification information can be encrypted to improve security. In addition, the signal measurer may discard the identification information after measuring the location of the target terminal.

When the communication method and identification information of the target terminal are obtained in this way, the signal measurer measures the signal corresponding to the identification information in the signal of the corresponding communication method based on the identification information, and measures the location of the target terminal based on the measurement. do. In the above process, it is also possible to obtain location information of the target terminal from the signal measurer. In addition, it is also possible to acquire the location of the terminal in the server by transmitting the measurement result to a server such as a location measurement server.

In the above situation, in order to measure the signal of the target terminal, the target terminal transmits a constant signal. For example, an unlicensed band communication device or an ultra-wideband communication device of the target terminal is set to act as an AP. In this case, the corresponding communication device of the target terminal periodically transmits a signal such as a beacon. The signal is measured by the communication device of the signal meter. As another embodiment, a method in which a communication device of a signal measurer periodically transmits a predetermined signal and a corresponding communication device of a target terminal reports a measurement result thereof is possible. In another embodiment, by controlling an unlicensed band communication device (eg, WIFI AP) or an ultra-wideband communication device that communicates with the target terminal, the communication device may issue a command to transmit a certain signal from the target terminal. In another embodiment, the communication device of the signal measurer periodically transmits a predetermined signal, the corresponding communication device of the target terminal sends a response to it, the communication device of the signal measurer measures it, and based on this, the location of the target terminal is determined. A way to measure it is also possible.

2, 3, and 4 show signal flows for the three operations described above. 2 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to an embodiment of the present disclosure. 3 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to another embodiment of the present disclosure. 4 is a diagram illustrating signal transmission and measurement between a target terminal and a signal measurer according to another embodiment of the present disclosure.

Referring to FIG. 2 , when positioning of a target terminal starts, an unlicensed band communication device or an ultra-wideband communication device of the target terminal periodically transmits a signal (S100). According to an example, the signal may be a beacon signal. The signal measurer measures the signal transmitted by the target terminal (S110), and the position of the target terminal can be calculated based on the measurement and the location information of the signal measurer.

When a positioning request for a target terminal is received, one or more signal measurers move to the vicinity of the location of the target terminal to find the location of the target terminal. The movement can be searched by a person possessing the signal measuring device while carrying the coral measuring device. In addition, the same operation can be performed by mounting the signal measurer on a moving object such as a drone. When it is confirmed that the device has arrived nearby, the signal measurer or a server connected thereto commands the target device to transmit a search signal. The command may be transmitted through a mobile communication network. Upon receiving the command from the mobile communication network, the target terminal transmits a search signal.

The signal for the search may be a signal of an unlicensed band such as WIFI or Bluetooth. In addition, it may be an ultra-wideband signal such as UWB (Ultra Wide Band). The target terminal receiving the command detects nearby interference, determines an optimal frequency band, and transmits an unlicensed band or ultra-wideband signal to the band. The transmission method, used frequency, transmission period, MAC ID, etc. of the transmitted signal are transmitted to the server, and the server transmits the information to a signal measurer to search for the signal. In the above process, a beacon of a certain period may be transmitted, and not only the MAC ID transmitted to the beacon but also other additional messages may be transmitted to the signal measurer to notify.

In addition, in the above process, it is possible to facilitate search by determining a predetermined form and period of a signal transmitted by the target terminal. However, the frequency to be used can be set in a direction in which interference is reduced according to the area where the target terminal is located. In the above process, the power of the signal transmitted by the target terminal may be set to be transmitted at the maximum usable power. In this way, it is possible to inform the signal measurer that the target terminal transmits a signal. The target terminal may directly inform signal measurers of the above process. It is also possible to transmit via a server.

When it is known that the signal transmitted by the target terminal is transmitted, the signal measurer detects the signal transmitted by the target terminal, measures the strength of the signal, transmission direction, time delay, etc., and calculates the measurement result and the position of the signal measurer. Based on this, it is possible to calculate the position of the target terminal.

Figure 3 shows an embodiment in which the communication device of the signal measurer transmits a signal. For example, each signal measurer may transmit a beacon signal at regular intervals (S200). This is received by the unlicensed band or ultra-wideband communication device of the target terminal and measures the signal (S210). The location of the target terminal may be calculated based on the measured values. In this case, the communication device of the target terminal can calculate its own location by securing the location information of the signal measurer. Alternatively, the target terminal may transmit the result to be measured to the location measurement server, and the location measurement server may calculate the location of the target terminal based on the measurement result of the target terminal and the location information of the signal measuring device.

In the above process, information about the signal transmitted by the signal measurer is transmitted to the server, and the server informs the target terminal so that the target terminal can improve the performance of receiving the signal. For example, the frequency band, transmission method, MAC ID information or information included in the header of the signal transmitted by the signal meter is transmitted through the server, and the communication device of the target terminal easily receives the signal based on the information can do

In the above process, the target terminal may transmit information such as identification information and reception strength of the detected signal measurer to the server so as to calculate location information of the target terminal. In the above process, the signal measuring device transmits its own location information to the server, and the server can obtain the location information of the target terminal based on the location information of the signal measuring devices and the measurement information of the target terminal. In the above process, the MAC ID may be used as identification information of the signal transmitted by the signal meter. In addition, it is possible to transmit signal information transmitted by each signal measurer, including information of the MAC ID, frequency band, transmitted signal format, etc., to a corresponding communication device of the target terminal.

In the above process, the signal measurer transmits a signal and informs the target terminal of the information, which can be notified through a mobile communication network. After checking the information, the target terminal detects and measures the signal by driving an unlicensed band communication device or an ultra-wideband communication device. The signal to be measured may measure signal strength as well as ID information of the signal to be transmitted. In addition, it is possible to measure the direction in which a signal to be transmitted is received.

Although the expression signal measurer was used in the concept of FIG. 3, it can actually be interpreted as a mobile signal transmitter from the viewpoint of the communication system of the unlicensed band. As such, in the present invention, the signal measurer is not only a concept of a signal measurer that receives signals of the unlicensed band or licensed band of a mobile target terminal, but also a signal generator of a mobile unlicensed band or ultra-wideband (hereinafter, it may also be referred to as a signal transmitter) It should be interpreted as a concept that includes the concept of

In the concept of FIG. 3, the signal generator of the unlicensed band can transmit signals of a certain unlicensed band in various places. By transmitting the signal of the unlicensed band at two or more different places, the location of the target terminal can be determined based on whether the target terminal receives the signal and the level of the received signal. And, by transmitting the information on each transmission location to the location measurement server, it is possible to accurately measure the location of the target terminal. In addition, the location measurement server may measure the location of the target terminal based on the transmission location information and the measured value of the target terminal.

In the case of a mobile signal generator, a signal in an unlicensed band is transmitted after a decision or a command for position measurement of a target terminal is given, so that interference in the corresponding band can be minimized in normal times. Alternatively, for the same purpose, after receiving an instruction or determination that the target terminal has arrived near or within a certain distance, the signal of the unlicensed band may be transmitted. In the above case, it is suggested that the signal is not transmitted normally, but the signal is started to be transmitted after the location measurement of the target terminal is determined or after it is determined that the target terminal arrives near the target terminal. On the other hand, while transmitting a signal at the first transmit power level in normal times, the signal may start to be transmitted at the second transmit power level after a location measurement decision for the target terminal is made or after it is determined that the target terminal arrives near the target terminal. In this case, it is proposed to set the second transmit power level higher than the first transmit power. The user of the signal generator may input the determination of the situation through the input device of the signal generator to start signal transmission or to increase the transmission power level. It is possible to request the measurement of the signal by notifying the location measurement server or the target terminal of the state change of the signal generator in response thereto through the communication device.

4 shows another embodiment of signal measurement. Referring to Figure 4, the signal measurer can transmit a signal at regular intervals (S300). The signal may include a beacon signal. After the communication device of the target terminal receives the signal, it transmits a reply (S310). The signal measurer measures the above-mentioned reply signal (S320), and based on this, the position of the target terminal can be measured. In this case, the location information of each signal measuring device can be secured together and used for location calculation. The above position measurement may be calculated by the signal measurer by communicating with each other. However, it is also possible to transmit the information to one server and calculate the location of the target terminal in the server.

Through the above reply, it is possible to calculate the round trip time delay. Through this, it is possible to more accurately measure the distance between the target terminal and the signal measurer. 4 illustrates an embodiment in which the signal measurer transmits signals at regular intervals. However, it is also possible that the target terminal transmits a signal such as a beacon at regular intervals and the signal measurer receives it and transmits a response thereto. In this way, the target terminal can obtain round trip time information, and the target terminal transmits the information to the positioning server, and based on this, it is possible to obtain location information of the target terminal. At this time, each signal measurer can transmit its location information to the location measurement server to help calculate the location of the target terminal. It is possible to acquire or improve the location information of the target terminal based on the location information of the above-described signal measurers and the measurement information of the target terminal.

The above operation can be performed by the signal measurer of the present invention at two or more different locations to measure the location of the target terminal. Also, a communication device that starts transmitting a signal first may start to measure the position of the target terminal after determining or after determining that the signal measurer is near the target terminal.

As described above, a server that controls the operation is required to enable the communication devices and the signal measurer of the target terminal to transmit and measure signals to acquire location information of the target terminal. The server should not only make the communication device of the target terminal operate, but also make the signal measurer perform an operation to measure the signal of the target terminal to be positioned.

2, 3 or 4 as described above, a positioning request must be made to the server. The positioning request may be requested by the target terminal itself. Also, it is possible to request from an external server. A location measurement server may be utilized as the external server. In addition, it is possible for the signal measurer to request positioning for a terminal that satisfies a certain condition.

Under the above conditions, (1) when a location measurement decision for the target terminal is made or a request is received, (2) when it is determined that the distance between the target terminal and the signal measurer is within a certain distance, (3) or, the target terminal For , it may include a case where it is confirmed through a signal measurer to enter a cell or region supporting location measurement.

According to the determination, the communication device transmitting the signal may transmit the signal, and the communication device measuring the signal may receive and measure the signal. It is necessary to exchange information on operation between communication devices so that the two operations can be performed simultaneously or at the same time. As in the present disclosure, if the operation is performed through an unlicensed band or ultra-wideband communication device, information exchange may be performed through a mobile communication system of a licensed band. In addition, when the target terminal performs the above operation through communication with a certain server through unlicensed band communication, information may be exchanged through the communication path. An example of this may include a case where the positioning is determined by the target terminal communicating with an external server outside the mobile communication coverage.

In addition, in the present disclosure, the signal measurer includes a receiver for a mobile communication uplink signal and a communication device for unlicensed band or ultra-wideband communication, and measures the location of a target terminal through an uplink signal of a mobile communication system according to circumstances, or It enables measurement based on signals of unlicensed band or ultra-wideband communication method. Also, in some applications, it is possible to measure the position of a target terminal based on signals transmitted from two or more communication devices installed in one target terminal at the same time in order to improve the accuracy of position measurement.

5 and 6 are diagrams illustrating examples of operating two different communication methods according to an embodiment of the present disclosure.

Referring to FIG. 5 , an embodiment of measuring the location of a target terminal using two or more communication methods is illustrated in the present disclosure. In general, coverage is formed differently for each communication method. In general, the coverage of the mobile communication system is the largest, and the coverage decreases in order of WIFI, Bluetooth, and ultra-wideband communication. And, in the case of Bluetooth long range, it is possible to secure coverage equal to or higher than that of WIFI. Referring to FIG. 5, it is shown that the coverage 20 of another communication system is included in the coverage 10 of one communication system. For example, the large area 10 represents coverage operating in a mobile communication system. In addition, in the case of the small area 20 inside, coverage of an unlicensed band or ultra-wideband communication method.

Referring to FIG. 5, according to an example, when the signal measurer moves, the signal measurer initially operates only based on the mobile communication system, and additionally operates a communication device of an unlicensed band or ultra-wideband communication system when approaching a target terminal. to measure the position of the target terminal. That is, the operation ranges of two or more communication systems are checked, and when each operation range is confirmed, the corresponding communication system can be operated. The above operation not only operates the communication device of the target terminal, but also enables the operation of the measuring device or communication device for the communication device of the signal measurer.

In the present disclosure, it is first determined whether or not to start measurement of a target terminal to be positioned. For example, this may be positioning for emergency rescue, or the owner of the terminal may start positioning by requesting positioning for navigation or the like. When the positioning of the target terminal is initiated in this way, it is necessary to determine which communication method is to be used for positioning.

For example, the present disclosure may include a condition for operating mobile communication uplink-based positioning and a condition for driving a communication device of an unlicensed band or ultra-wideband communication device. After checking the above conditions, if the conditions for operating mobile communication uplink-based positioning are satisfied, uplink signal transmission of the target terminal is performed, and precise positioning based on the uplink signal is performed. In addition, the operation conditions of the unlicensed band or ultra-wideband communication device are checked, and if the corresponding condition is satisfied, the unlicensed band or ultra-wideband communication device is driven to perform precise positioning. A device that determines the above conditions may be a location measurement server or a signal measuring device. In addition, the target terminal or a mobile communication network communicating with the target terminal may determine and notify the positioning server or signal measuring device.

As shown in FIG. 5, in performing a target terminal search based on unlicensed band or ultra-wideband communication such as Wi-Fi in some regions, unlicensed band or ultra-wideband communication can be additionally used when it is more advantageous than using the uplink of the mobile communication system. can For example, when the target terminal is near the base station or in a visible environment with the base station, the uplink transmission power may not be set high. In this case, the location of the target terminal can be calculated using signals of the unlicensed band or ultra-wideband signals by using the target terminal and the signal measurer. As another example, if it is difficult for the signal meter to measure an uplink signal because the target terminal exists in the handover area and frequently performs or may perform handover, additionally using an unlicensed band signal or ultra-wideband signal Position measurement of the target terminal may be performed.

For example, in order to reduce the power consumption of the target terminal, position measurement of the target terminal based on the mobile communication signal is generally performed, but in the following cases, only the unlicensed band or ultra-wideband communication signal is additionally used, or the mobile communication signal In addition, the location of the target terminal can be measured by additionally using an unlicensed band or ultra-wideband communication signal.

(1) When the power transmitted by the target terminal is lower than a predetermined reference value, it may be difficult to measure the location of the target terminal only with the mobile communication signal because the transmission power of the target terminal is low. Alternatively, when the radio wave attenuation of the forward link is measured and the radio wave attenuation is less than a certain value, an unlicensed band or ultra-wideband communication signal may be additionally utilized.

(2) When the target terminal is located in the handover area and there is a possibility of frequent handover, or Ec/Io of the target terminal (where Ec is the power of a signal received by the target terminal from the serving cell, and Io is When the total received power)) of the target terminal is lower than a specific threshold, an unlicensed band or ultra-wideband communication signal may be additionally utilized.

(3) If the mobile communication network does not support positioning of a target terminal based on a mobile communication signal, an unlicensed band or ultra-wideband communication signal may be additionally utilized. For example, the corresponding case includes a case where positioning for a target terminal outside the mobile communication coverage is not supported, a case where a mobile communication device of the target terminal has a failure, and the like.

Various methods may be applied to determine the condition of whether the power transmitted by the target terminal in (1) is lower than a predetermined reference value. For example, information on transmission power transmitted by a mobile station may be obtained from a base station to determine a corresponding condition. In this case, according to an example, a power headroom report transmitted by the terminal may be used as one of the methods for securing the corresponding information. Alternatively, it may be determined based on the path attenuation of the forward link measured by the terminal. That is, when the reception level of a certain signal such as a pilot transmitted by the base station is received above a threshold value or when Ec/Io is received above a certain value, it can be determined that the path attenuation is small based on this.

In the above-described process, the area 10 performing precise positioning based on a mobile communication uplink signal and the area 20 performing positioning through an ultra-wideband or unlicensed band communication device may be configured differently. Referring to FIG. 6, an example in which a mobile communication uplink signal-based precision positioning area and an unlicensed band or ultra-wideband signal-based positioning area are set differently is shown. In this case, according to an example, the two operating areas may be set identically so that communication is always performed using two or more communication methods. Alternatively, according to an example, the range for performing positioning based on a mobile communication uplink signal may be configured to include a range for driving an unlicensed band or ultra-wideband communication device.

Alternatively, according to another example, it is possible to set the two regions differently. For example, in an area where positioning based on a mobile communication uplink signal is possible, positioning based on unlicensed band or ultra-wideband communication may be configured not to be used. Conversely, in an area where positioning based on unlicensed band or ultra-wideband communication is possible, positioning based on mobile communication uplink signals may not be used. in other words. The location of the target terminal can be determined using only one of the communication device in the licensed band and the communication device in the unlicensed band.

7 is a flowchart for determining a communication method supporting positioning according to an embodiment of the present disclosure.

The signal measurer of the present disclosure determines whether to perform location measurement based on an uplink signal of a mobile communication system when location measurement of a target terminal is started. The determination may be performed by a signal measuring device or may be performed by a positioning server.

Referring to FIG. 7 , first, a search for a target terminal may be started (S410). In this regard, determination as a target terminal and acquisition of approximate location information of the target terminal according to an existing method may be performed. If a predetermined condition for location measurement based on the uplink signal of the mobile communication system is satisfied (S420), the location measurement is performed by measuring the uplink signal of the target terminal (S430). According to an example, the predetermined condition may be that a target terminal or a signal measurer is located in an area where mobile communication uplink location measurement is performed. Alternatively, the predetermined condition may be that at least one signal measurer exists within a predetermined distance from a position where the target terminal is expected to be located.

In addition, it is possible to determine whether the location is measured through the unlicensed band or the ultra-wideband communication device (S440). If the corresponding condition is satisfied, positioning is performed using the unlicensed band or ultra-wideband communication device (S450). According to an example, the predetermined condition may be that the target terminal or signal measurer is located in an area where positioning is performed using an unlicensed band or ultra-wideband communication device. Alternatively, it may be a condition that at least one signal measurer exists within a predetermined distance from a position where the target terminal is expected to be located.

If the conditions for location measurement based on the uplink signal of the mobile communication system and location measurement through an unlicensed band or ultra-wideband communication device are not all satisfied, a notification indicating that location measurement according to the two methods is not possible is output. It can (S460). The output of the corresponding notification may be output through an interface such as a display, a speaker, or a haptic module provided in the signal measurer or the position measurement server.

The present disclosure determines a target terminal to be measured, and in measuring the position of the target terminal, positioning using a mobile communication uplink signal and positioning using an unlicensed band or ultra-wideband communication device are used in combination. Suggest a way. When the target terminal is determined, the control server that controls location measurement may determine a communication method to be used for location measurement and instruct the target terminal to operate a communication device of the communication method. In addition, the control server may instruct the signal measurer to perform positioning for the communication method. The operation instruction of the signal measuring device may be transmitted by the control server through the positioning server. Also, the role of the control server may be configured to be performed by a positioning server.

For the above operation, software of the target terminal may need to be changed. For example, software for controlling an unlicensed band communication device and an ultra-wideband communication device may be required in a target terminal. According to an example, the software is installed in the target terminal in the form of a smartphone application (referring to Application or APP), and may operate based on information of the corresponding App. Downloading and installation of the app follows a known method, and is not limited to a specific method.

Alternatively, the software may be implemented to be included in a part of the operating system (OS) of the smartphone. That is, the corresponding software may be added as a function of the operating system during the initial production of the terminal or through OS update thereafter.

When the control server controlling location measurement instructs to operate a communication module corresponding to the determined communication method, the target terminal may operate the corresponding communication module according to the instruction. Also, according to an example, the target terminal may provide a user interface related to a corresponding positioning operation on a display of the target terminal based on the information included in the software. Also, according to an example, the description of the software may be substantially equally applied to a signal measurer.

The signal measurer for positioning technology proposed in the present disclosure can be implemented in various ways.

8 is a diagram illustrating implementation of a signal measurer according to an embodiment of the present disclosure. 9 is a diagram illustrating implementation of a signal measurer according to another embodiment of the present disclosure. 10 is a diagram illustrating implementation of a signal measurer according to another embodiment of the present disclosure.

Referring to FIG. 8 , the signal measurer 800 may include a downlink signal receiver 810, an uplink signal receiver 820, and a control unit 830 of a mobile communication system. The signal measurer 800 may be implemented to be connected to a terminal 850 that is a separate communication device such as a smartphone or tablet. In this case, the signal measurer 800 may use a corresponding device included in the terminal 850 if it is necessary to use an unlicensed band or ultra-wideband communication device to measure the location of the target terminal. In this case, according to an example, the signal measurer 800 may be implemented in the form of a terminal cover that is communicatively connected to the terminal 850 .

In addition, the signal measurer 800 may further include a GPS receiver 840 for receiving GPS information. In addition, the signal measurer 800 may be connected to an input device 860 included in the terminal 850 or configured separately, and receive a user input through the corresponding input device 860 .

In FIG. 9, another example of a signal measurer 900 composed of a downlink signal receiver 910 and an uplink signal receiver 920 of a mobile communication system is connected to a terminal 950, which is a separate communication device such as a smartphone or tablet. shows The difference from the aforementioned FIG. 8 is that the signal measurer 900 does not use the unlicensed band or ultra-wideband communication device included in the terminal 950, but uses a separate unlicensed band or ultra-wideband communication device 970. It is to measure the signal of the target terminal. In this case, the signal measurer 900 may use a device such as a mobile communication device or a display of the terminal 950 and the input device 960 .

The above-described separate communication device 970 is mounted on the same module as the module including the downlink signal receiver and the uplink signal receiver for the mobile communication system, and it is possible for this module to operate in connection with a smartphone or tablet. . However, the module including the separate communication device 970 may be implemented as a separate module different from the module including the downlink signal receiver and the uplink signal receiver.

10 shows another implementation of the signal measurer 1000 of the present disclosure. The implementation of FIG. 10 includes a downlink signal receiver 1010 and an uplink signal receiver 1020 of a mobile communication system, and includes an unlicensed band or ultra-wideband communication device 1080. In addition, it includes a communication unit 1040, which is a communication device for communicating with the outside, and through the communication unit 1040, the signal measurer 1000 can be connected to a location measurement server or a mobile communication network. The signal measurer 1000 according to the embodiment of FIG. 10 is a portable terminal including an input unit 1050 and a display 1060 capable of displaying measurement and location measurement results. The implementation of FIG. 10 is interpreted as including a receiver for an uplink signal of a mobile communication signal transmitted by a target terminal to a general smartphone or mobile phone, and in addition to a receiver for detecting an unlicensed band or ultra-wideband communication signal transmitted by the target terminal. can do. In addition, it is also possible to place the signal measurer at a fixed location and measure the signal of the target terminal.

As described above, the signal measurers of FIGS. 8, 9, and 10 may use an input device or display provided in a separate terminal, or may include a separate input device or display. The signal measurer may display the location of the target terminal or characteristics of the signal measured by the signal measurer on the display. In addition, the location or status of the signal measurer as well as the location information of the target terminal can be displayed. Through the input device, a person possessing the signal measuring device may input a command to start measuring a position of a target terminal or transmit it to another device. According to one example, the display and the input device may be implemented as an integrated touch screen.

In the configuration of the signal measurers of FIGS. 8, 9 and 10, a time synchronization device such as a GPS may be additionally included as a device for securing time synchronization between each signal measurer. In the present disclosure, GPS should be interpreted in a broad sense including GNSS that receives signals transmitted from satellites or devices that transmit signals to measure positions and calculates positions based thereon.

The present disclosure proposes a method of using unlicensed band communication or ultra-wideband communication to measure the location of a target terminal. In order to obtain the position of the target terminal within a short time, it is necessary to detect and measure a signal transmitted for positioning at a long distance.

However, Wi-Fi or Bluetooth, which are unlicensed band communication systems, is a communication method designed for short-distance communication, so it may not be easy to detect and measure at a long distance. In the case of Wi-Fi, the preamble consists of two training sequences of 8 μs. A signal must be sensed in this section to compensate for the frequency offset. Therefore, it is not easy to detect a Wi-Fi signal at a long distance. Also, in the case of Bluetooth, it is common to use a short preamble. Recently, the Bluetooth long-range standard was created to enable Bluetooth to be used over long distances. In this case, the length of the preamble and access code of Bluetooth was made about 8 times longer than before.

In the present disclosure, a method for detecting a communication signal of an unlicensed band at a long distance is proposed. In particular, since many mobile communication terminals include communication devices such as Wi-Fi and Bluetooth, a technique for locating the terminal using the communication devices is proposed. In an embodiment of the present disclosure, a method in which a target terminal transmits a signal in an unlicensed band and a signal measurer detects it and a method in which the signal measurer transmits a signal in an unlicensed band and the target terminal detects it and reports it to a server or a signal measurer are proposed. do.

In the above process, it is very important to select a communication method capable of detecting a longer distance and to determine the transmission frequency. In this process, it is necessary to check how much the maximum transmittable power for each communication method is in the target terminal. In addition, it is necessary to check what kind of transmission method can be supported with respect to the communication method that can be supported by each target terminal. Through this, when a signal is transmitted with the maximum possible output, a communication method that can be detected at the longest distance is selected, and the target terminal can transmit a communication signal in the unlicensed band using this.

In the above process, the target terminal may additionally determine the quality of the channel for each band by measuring the interference of the channel, etc., and reflect this in the frequency selection. The above-described signal measurer and channel measurement information of the target terminal are transmitted to the positioning server, and the positioning server determines a frequency to be used and informs the signal measurer thereof. In addition, by transmitting measurement information of the signal measurer to the target terminal, the target terminal may determine a frequency to be used and inform the signal measurer of this. In addition, after transmitting the quality information of the channel measured by the target terminal to the signal measurers, one of the signal measurers may select a frequency band to be used. The above operation may be performed by a master signal measurer among signal measurers.

11 is a flowchart illustrating a determination of a transmission setting of a signal according to an embodiment of the present disclosure.

In the above process, it is possible to select a frequency to transmit a communication signal of the unlicensed band. In the conventional method, a user may arbitrarily select a frequency or transmit a beacon by determining a frequency having the least interference around a communication device set as an AP. In the present disclosure, each signal measurer may measure the power of interference signals in an unlicensed band and transmit the information to the positioning server so that the signal measurer can detect the signal of the target terminal at a long distance (S510). Based on the location and interference signal information of each signal measurer, the location measurement server determines the communication method and frequency of the unlicensed band to be transmitted by the target terminal (S520), informs the target terminal of this, and transmits the unlicensed band signal using the frequency. It can be done (S530). That is, the signal transmitted by the target terminal is received in a frequency band where interference is less received by the receiver of the signal measurer, so that the signal measurer can detect the signal even at a long distance (S550).

In selecting a frequency in the above process, it is possible to select a frequency band and communication method having a common channel environment by simultaneously considering the interference level information measured by the signal measurer and the interference level information measured by the target terminal. In the above process, since the communication path of the unlicensed band has not yet been formed between the target terminal and the signal measurement period, communication of the unlicensed band to be detected is performed in order to share information for extending the detection distance or to notify the start of a certain operation (S540). A communication path other than the link is used. According to an example, mobile communication of a licensed band may be used as the communication path. That is, the information can be exchanged using a mobile communication transceiver installed in the target terminal. The location measurement server may determine the frequency band and inform the target terminal and the signal measurer. In addition, this can be performed in the target terminal or signal measurer to inform the rest of the devices.

12 is a flowchart for determining a transmission setting of a signal according to another embodiment of the present disclosure.

A signal measurer or signal generator (hereinafter, may also be referred to as a mobile beacon, a mobile beacon transmitter, a mobile signal transmitter, or a signal generator) transmits a signal of the unlicensed band (S630), measures the signal in the target terminal, and locates it The measurement server may be notified (S650). Alternatively, the target terminal may inform the signal measurer or mobile beacon of the measurement result. Based on the above measurement, the location of the target terminal may be determined. In this process, in order to detect the signal of the unlicensed band transmitted by the target terminal with high performance even at a long distance, the target terminal reports the channel status of the unlicensed band to the location measurement server (S610), and based on the measurement result, a signal measuring device or The communication method and frequency band transmitted by the mobile beacon may be set (S620) and transmitted (S640). Also, the determination may be performed by the target terminal.

In this way, the target terminal receiving the signal of the unlicensed band measures the nearby channel environment and informs the transmitter that transmits the signal, so that the signal can be transmitted using the frequency that can be received with the best performance. Information can be exchanged. It is possible to use the mobile communication system of the licensed band, which is a communication method other than the link of the unlicensed band in which the above information is to be detected.

13 is a diagram showing the structure of a frame transmitted in WIFI according to an embodiment of the present disclosure.

We propose a method to extend the detectable distance in the Wi-Fi communication method, which is the most widely used unlicensed band. 13 shows a format of a WIFI beacon frame signal transmitted after the preamble. Some or all of the above data may be shared between the signal measurer and the target terminal, and a beacon signal may be transmitted based on the shared information. A receiver that detects this can detect a beacon signal based on the information. In the above process, it is necessary to set the length of data long enough to detect signals even at long distances. The shared data may include a source address (SA), a destination address (DA), and a BSS ID. In addition, contents included in the SSID or option field can be shared.

In sharing the above data, the data to be transmitted can be promised and transmitted in advance. In addition, a plurality of data sets may be determined and one of them may be transmitted. In addition, the side transmitting the signal may generate arbitrary data and transmit the signal to a signal measurer that receives and detects the signal to inform it.

In order to share some or all of the above data, a link other than an unlicensed band communication link may be used as a communication channel between the target terminal and the signal measurer (or mobile beacon). A mobile communication link may be used as the other link. Alternatively, there is a predetermined server in the middle of the communication path, which can mediate communication between the target terminal and the signal measurer (or mobile beacon).

As a method of sharing the data, signal detection and measurement can be performed using a predetermined signal between a transmitter of an unlicensed band communication method and a receiver that detects it. As another example, some or all of the aforementioned fields may be shared and used to regenerate a part of a signal transmitted by the transmitter and use it for detection. As another example, it is possible to define some signals transmitted by the transmitter of the unlicensed band and share parameters for specifying the signals through a communication channel. The receiver receiving the parameter can regenerate a part of the signal transmitted by the transmitter and use it for detection. Based on the signal regenerated by the method of detecting the signal described above, the received signal is matched and filtered to obtain information such as the presence or absence of the signal, the reception level, and the time delay.

Through the above process, it is possible to overcome the limitations of the Wi-Fi signal generated due to the short preamble and identification information, and to detect the Wi-Fi beacon signal even at a long distance. In this process, the above data is regenerated and the length of the signal used for the matched filter is longer than 8 us, which is the length of the preamble of the Wi-Fi signal. Alternatively, it is used longer than 16 us, which is the sum of the two preamble lengths.

In order to facilitate regeneration of the Wi-Fi signal, a mode that does not use a channel code may be used. For example, a beacon may be transmitted using a direct sequence spread spectrum (DSSS) operation mode used in 802.11b through the above process. When a communication method that does not use a channel code is used, it is easy to regenerate a signal transmitted by a receiver performing detection.

14 is a diagram illustrating a structure of a frame transmitted in Bluetooth according to an embodiment of the present disclosure.

In addition, signal regeneration can also be performed in Bluetooth in the receiver that performs the above detection. 14 shows an example of data transmitted through Bluetooth. The data of FIG. 14 are data transmitted after the preamble. Detection performance can be improved by sharing some or all of the above fields between a transmitter and a receiver that detects them. As a method of sharing the data, signal detection and measurement can be performed using a predetermined signal between a transmitter of an unlicensed band communication method and a receiver that detects it. As another method, some or all of the fields described above may be shared and used to regenerate a part of the signal transmitted by the transmitter and use it for detection. Another method is to define some signals transmitted by transmitters in the unlicensed band and to share parameters for specifying the signals through a communication channel. The receiver receiving the parameter can regenerate a part of the signal transmitted by the transmitter and use it for detection. It is possible to acquire information such as the presence or absence of a signal, received power, and time delay by performing matched filtering on the received signal based on the signal regenerated by the method of detecting the signal described above.

As described above, the target terminal that needs location measurement transmits a beacon at regular intervals. One way to do this in Bluetooth is to transmit advertisement packets at regular intervals. On the other hand, the mobile signal transmitter may transmit beacons at regular intervals, and the target terminal may detect them.

15 is a diagram illustrating a structure of a frame transmitted in a Bluetooth long range according to an embodiment of the present disclosure.

For long-distance detection, we propose to extend the detected distance using Bluetooth long range. 15 shows a packet format used for Bluetooth long latency. Bluetooth long range transmits 80us by extending the length of the preamble to a greater extent than before for long-distance communication. Also, the access address can be transmitted for 256us. In one embodiment, the target terminal can regenerate the signal by informing the signal measurer of the access address to be transmitted. As another embodiment, in the case of using coded PHY, the content of CI (coding indicator) and Term1 can also be shared so that the receiver can regenerate the signal.

As another example, the performance can be further improved by pre-promising a signal to be transmitted as a message or notifying the receiver to regenerate part or all of the message. In the above process, all or part of the content transmitted in the message may be informed through the communication channel. A mobile communication link may be used as the communication channel. That is, before a link of an unlicensed band or ultra-wideband communication signal such as Bluetooth or Wi-Fi is formed, the information is exchanged using a mobile communication link to transmit a signal capable of locating the target terminal even at a long distance.

16 is a flowchart illustrating an operation of a receiver for measuring a signal according to an embodiment of the present disclosure.

The receiver of the positioning device using unlicensed band or ultra-wideband communication proposed in the present disclosure may be implemented in a signal measurer when a target terminal transmits a signal for positioning. In addition, when the beacon is transmitted from the signal measurer, it is also possible to implement it in the target terminal.

In FIG. 16, the receiver receives channel configuration information or identification information about the signal of the unlicensed band transmitted from the transmitter (S710). The above configuration information may include a communication method used, frequency, transmission period, and other parameters. In addition, information such as a message to be transmitted or an access address may be included. Based on the above information, the receiver regenerates part or all of the signal transmitted by the transmitter (S720). The signal is detected and measured by performing matched filtering on a transmission frequency using the regenerated signal (S730). In the above process, it is possible to reduce the amount of data to be transmitted by promising several messages or addresses in advance and transmitting parameters capable of transmitting the information.

17 is a diagram illustrating a configuration of a receiver 500 for detecting and measuring a signal according to an embodiment of the present disclosure.

Referring to FIG. 17, an example of a receiver for detecting and measuring an unlicensed band or ultra-wideband signal is shown. The receiver 500 receives the configuration and identification information of the signal transmitted by the transmitter through the communication device, and the control device 540 regenerates some or all of the signal transmitted by the transmitter through the signal regenerator 530. there is. A signal may be detected based on information of the regenerated signal. At this time, if the signal to be transmitted is randomly generated to have a characteristic of a low autocorrelation function, signal detection may be facilitated. In the above process, a matched filter 520 may be used as a detector. When a large correlation value between the received signal and the regenerated signal is observed, it can be determined that a signal has been detected. As another example, the regenerated signal may be transmitted as a sum of one or more single tones. In this case, it is possible to detect based on the magnitude of the frequency tone based on the characteristics of the regenerated signal without detecting through a matched filter. When the signal is detected in this way, the frequency deviation of the input signal is measured through the frequency error detector 510.

In the case of an unlicensed band or ultra-wideband communication signal, the frequency deviation of the transmitted signal is large. This frequency deviation can significantly degrade performance in detecting and measuring signals. In the present invention, when multiple signal measurers search for a signal of a target terminal, the signal measurer that first searches for the signal measures the frequency deviation and exchanges the information to improve the detection and measurement performance of other signal measurers. . The information may be shared through a mobile communication link. To this end, when several signal measurers detect a signal transmitted by one target terminal, the first signal measurer transmits information on the frequency deviation of the signal transmitted by the target terminal measured by the detected signal measurer to the server, and the server transmits information to the other signal measurers. You can share this information with

If two or more signal measurers measure the frequency error of the target terminal in the above process, a more reliable value of the frequency error can be obtained based on the measured value and notified to the other signal measurers. At this time, a measurement with higher reliability or a higher signal-to-noise ratio among two or more frequency error measurement values may be output as the final frequency error. As another method, two or more frequency error measurement values may be averaged or linearly combined and output as a final frequency error value.

The signal measurer receiving the frequency offset information of the target terminal detects the signal transmitted by the target terminal by utilizing the frequency offset information received at the center frequency of the signal transmitted by the target terminal. The frequency offset can be compensated for by changing the oscillation frequency of the local oscillator by the frequency offset or by correcting the phase of an input signal downconverted with respect to the same local oscillator at a constant rate in consideration of the frequency offset. After receiving the frequency offset information in the above process, the detection performance can be improved by increasing the length of time for coherent accumulation of the matched filter compared to before.

18 is a diagram showing the configuration and connection between the signal measurer 100 and the target terminal 200 according to an embodiment of the present disclosure.

Referring to FIG. 18, the target terminal 200 includes a mobile communication transceiver and an unlicensed band or ultra-wideband communication device. The target terminal 200 transmits an uplink signal through a mobile communication transmitter when positioning is required. The signal measurer 100 can detect and measure the signal to determine the location of the target terminal. In addition, the target terminal 200 is provided with an unlicensed band or ultra-wideband communication device to transmit an unlicensed band or ultra-wideband signal, and the signal measurer 100 detects and measures the signal to determine the location of the target terminal. In addition, it is also possible that the signal measurer 100 transmits an unlicensed band or ultra-wideband communication signal and the target terminal receives it. Also, a link capable of communicating with each other is formed between the target terminal 200 and the signal measurer 100, and a mobile communication link can be used as the communication link. The start and termination of an operation are mutually confirmed through the link. In addition, configuration of a channel to be transmitted through the link, identification information, and setting parameters may be exchanged. Also, information such as frequency offset may be exchanged. In addition, a message capable of regenerating a transmitted signal or a configuration parameter of a channel or identification information may be exchanged.

When a target terminal transmits a signal and the signal measurer detects it, there may be a case in which signals transmitted by several target terminals must be detected at the same time. In this case, different target terminals can be configured to transmit different and identifiable signals. To this end, each different target terminal may randomly generate a signal, transmit the information to the server, and the server may inform the signal measurer. In addition, a signal to be generated by the server may be determined by another method, and identification information on the signal may be transmitted to the target terminal and the signal measurer to detect it. In addition, it is also possible for a signal measurer functioning as a master among a plurality of signal measurers to determine a signal to be transmitted by the target terminal and to request transmission of the signal by the target terminal. As another method, the target terminals may include the MAC ID based on the MAC ID or create a signal generated therefrom and transmit the MAC ID information to the server so that the server informs the signal measurer.

When two or more mobile signal generators transmit signals and the target terminal detects the signals, it is more efficient to have the signals generated by the signal generators generate different signals that can be identified from each other. To this end, different signals may be generated and identification information or parameters thereof may be transmitted to the target terminal. In the above process, a signal may be transmitted based on identification information unique to the signal transmitter, such as a MAC ID, and the target terminal detecting the identification information or parameters may be notified.

In addition, it is possible to reduce interference between the signal transmitters of the unlicensed band by securing time synchronization information between signal transmitters that periodically transmit signals of the unlicensed band and setting the signals to be transmitted at different times.

In this way, even if the second communication link of unlicensed band or ultra-wideband communication is not formed between the signal measurer 100 and the target terminal 200, mutual detection and measurement can be facilitated by exchanging information using another communication link. there is. Although the communication between the target terminal and the signal measurer may be performed by connecting a direct link, the server 400 may help control and exchange information by placing an intermediate positioning server or control server. To this end, a third communication link between the target terminal and the server may be formed, and a first communication link between the server and the signal measurer may be formed. Different communication systems may be used for the above two communication links. In an embodiment of the present disclosure, the two communication links may be configured using a mobile communication network.

In general, a target terminal performs communication with a server using mobile communication. However, when the target terminal is located outside the mobile communication coverage, it is possible to perform communication with the server using a communication method capable of communicating with the outside including WIFI using another communication method such as WIFI. In addition, the signal measurer may also exist outside the mobile communication coverage. Even in this case, the signal measurer may communicate with the server using other communication methods including D2D and TRS.

In this way, locating the target terminal using unlicensed band communication or ultra-wideband communication is to measure the signal of the target terminal in at least two or more places by using a signal measurer, or transmit a communication signal from the signal measurer and receive it by the target terminal. This allows for more accurate positioning.

In the above process, the transmission of the unlicensed band or ultra-wideband communication signal may start when the user of the target terminal makes an input through the user interface. In addition, a person possessing a signal measurer or a mobile signal generator can approach the target terminal and request signal transmission to the target terminal through a user interface of the signal measurer upon determining this. In the above process, the signal measurer receives the input and informs the location measurement server, and the location measurement server can inform the target terminal of this. When the signal measurer transmits a signal, the user interface of the signal measurer may transmit the signal using unlicensed band communication or ultra-wideband communication and inform the target terminal of this fact. There is also an intermediary server that can relay message delivery.

As another method, when the distance between the two is reduced to a certain standard or less in a server that knows the location of the signal measurer and the approximate location of the target terminal, both sides can be notified of the start of signal transmission and detection. A location measurement server that obtains location information of a target terminal based on a measurement result as the server may be used. In addition, even when the signal measurer enters a certain area or when the approximate location of the target terminal is in a preset positioning possible area, the server transmits a signal to the target terminal, and the signal measurer can be set to detect and measure it. . In addition, when the mobile signal generator enters a certain area, the server may command the mobile signal transmitter to transmit a signal and the target terminal to detect and measure it.

Cancellation of location measurement using the above-described unlicensed band communication may proceed in the following ways similarly.

(One) When the user of the target terminal requests cancellation through the user interface, (2) when the owner of the signal meter or mobile signal generator requests cancellation using the interface used, (3) checks the conditions set in advance by the server and can be canceled if the above conditions are satisfied. It may be a case where location measurement of the target terminal is achieved with a certain accuracy or higher under the above conditions. In addition, when the signal measurer or the target terminal reaches an area or condition in which positioning can no longer be performed, it can be canceled.

According to this, by measuring the signal transmitted from the unlicensed band communication device or the ultra-wideband communication device installed in the mobile communication terminal to measure the location of the terminal, the location measurement of the terminal in the shadow area of mobile communication and the location of low price measurement may be possible.

Hereinafter, the operation of each device will be described in detail with reference to the drawings of each device related to position measurement of the target terminal described above. In the above description, the contents corresponding to each device may be substantially equally applied to the following description even if there is no separate description.

19 is a diagram showing the configuration of a signal measurer according to an embodiment of the present disclosure.

Referring to FIG. 19, the signal measurer 100 includes a first communication unit 110 using a first communication method, a second communication unit 120 using a second communication method, and a target terminal for positioning using the second communication method. Link formation or channel setting information is exchanged with the target terminal through the first communication unit, and based on the link formation or channel setting information, a signal of the second communication method transmitted by the target terminal is measured through the second communication unit, and the measurement is performed. It may include a control unit 130 that calculates the location of the target terminal based on the result or transmits the measurement result to the location measurement server through the first communication unit.

The signal measurer 100 may communicate with an external device such as a mobile communication network, a location measurement server, another signal measurer, or a target terminal using the first communication method. According to an example, the first communication method may be a mobile communication method using a licensed band. However, it is not limited thereto, and if the technical idea of the present disclosure can be applied, the first communication method may include other communication methods such as a device-to-device (D2D) communication method or a trunked radio system (TRS) communication method. can

The signal measurer 100 can transmit and receive unlicensed band or ultra-wideband signals using a communication method using an unlicensed band or ultra wide band (UWB) such as Wi-Fi or Bluetooth, which is a second communication method. there is. That is, the second communication unit 120 may be implemented as an unlicensed band or ultra-wideband communication device. In a state where the link between the signal measurer 100 and other devices is not formed, the transmission of the unlicensed band or ultra-wideband signal may be the output of the signal to a certain radius outside, and the reception of the unlicensed band or ultra-wideband signal from the outside. It may be a measurement of an unlicensed band or ultra-wideband signal being searched for.

For positioning using the second communication method, the control unit 130 may exchange channel setting information or whether a link is formed through the second communication method with the target terminal through the first communication unit. To this end, according to an example, the controller 130 may form a link with the target terminal using the first communication method. In this case, the controller 130 may receive channel setting information about whether a link is formed with the target terminal through the second communication method and a channel for transmitting a signal of the second communication method through the corresponding link. According to an example, information on whether a link is formed through the second communication method may include identification information of an unlicensed band or ultra-wideband device for link formation.

Based on the corresponding information, the control unit 130 forms a link with the target terminal using the second communication method, receives a signal of the second communication method transmitted by the target terminal through the second communication unit 120, and measures the corresponding signal. can do. Alternatively, the controller 130 may measure a signal of the second communication method transmitted by the target terminal through the second communication unit 120 without forming a link using the second communication method with the target terminal based on the corresponding information. can That is, the signal measurer transmits the unlicensed band or ultra-wideband signal output from the second communication method device of the target terminal to the information received through the first communication method device without going through a link forming operation with the second communication method device of the target terminal. Based on the signal of the second communication method can be measured.

Alternatively, according to another example, even when a link with the target terminal is not formed using the first communication method, when the first communication method is the mobile communication method, the controller 130 sets the second communication method to the target terminal. Whether or not a link is formed and channel setting information for a channel through which signals are transmitted may be received from a mobile communication network or a positioning server. In this case, the location measurement server may obtain related information through the target terminal, an external device requesting location measurement of the target terminal, or an input device provided in the location measurement server.

The controller 130 may calculate the location of the target terminal based on the measurement result of the signal of the second communication method or transmit the measurement result to the location measurement server through the first communication unit. Here, the measurement result of the signal of the second communication method may include information usable for calculating the location of the target terminal, such as received signal strength of the corresponding signal, angle of arrival, and round trip time delay.

According to an example, the signal measurer 100 may further include a signal measurer (not shown) for measuring a licensed band signal transmitted and received between external devices. As described above with reference to FIG. 1 , the signal measuring unit may measure a downlink signal transmitted from the base station to the target terminal or an uplink signal transmitted from the target terminal to the base station. That is, the signal measurer can measure the licensed band signal of the mobile communication method transmitted by the target terminal. The location of the target terminal can be measured using the measurement result of the uplink signal.

When location measurement of the target terminal is requested, the controller 130 may select at least one communication method to be used for location measurement from among the licensed band communication method and the second communication method of the target terminal based on a predetermined condition. That is, the control unit 130 may perform positioning by selecting a more suitable communication method among the licensed band communication method and the second communication method in order to measure the location of the target terminal.

According to an example, the controller 130 may be set to perform positioning of the target terminal using the first communication method first. In this case, the controller 130 may determine whether to use the second communication method alternatively or additionally by determining whether a predetermined condition is satisfied. Here, the predetermined conditions are whether or not selection information on the communication method to be used for location measurement is received, the transmission power of the licensed band signal transmitted by the target terminal, the possibility of handover according to the licensed band communication method for the target terminal, the target terminal and It may include whether to support location measurement using a distance or a licensed band signal. For example, when selection information for applying the second communication method is received from the outside, when the transmission power of a licensed band signal transmitted by a target terminal is lower than a reference value, handover over a predetermined number of times according to the licensed band communication method When there is a possibility, when the distance to the target terminal is less than a predetermined distance, or when the licensed band communication method is not supported, the second communication method may be used.

However, this is an example and is not limited thereto, and the control unit 130 may be set to use the second communication method prior to the first communication method. Alternatively, upon receiving the positioning request, the control unit 130 may set the first communication method and the second communication method with the same priority and apply a more appropriate communication method according to the predetermined conditions described above.

The control unit 130 may drive a communication device that measures a signal of at least one selected communication method and measure the corresponding signal.

According to an example, the control unit 130 receives, through the first communication unit 110, shared information about data or fields to be used for location measurement of a target terminal among data or fields included in a signal of the second communication method, and , At least a part of the data or field may be regenerated based on the shared information.

For example, in order to extend the detectable distance in the Wi-Fi communication method, some or all of the data in the WIFI beacon frame signal may be shared between the signal measurer and the target terminal, and a beacon signal may be transmitted based on the shared information. . A receiver that detects this can detect a beacon signal based on the information. In the above process, the length of the data can be set long so that a signal can be detected even at a long distance. Shared data may include a source address (SA), a destination address (DA), and a BSS ID. Also, content included in the SSID or option field may be shared.

In sharing the above data, the data to be transmitted can be promised and transmitted in advance. In addition, a plurality of data sets may be determined and one of them may be transmitted. In addition, the side transmitting the signal may generate arbitrary data and transmit the signal to a signal measurer that receives and detects the signal to inform it.

As a method of sharing the data, signal detection and measurement can be performed using a predetermined signal between a transmitter of an unlicensed band communication method and a receiver that detects it. As another example, some or all of the aforementioned fields may be shared and used to regenerate a part of a signal transmitted by the transmitter and use it for detection. As another example, it is possible to define some signals transmitted by the transmitter of the unlicensed band and share parameters for specifying the signals through a communication channel. The receiver receiving the parameter can regenerate a part of the signal transmitted by the transmitter and use it for detection. Based on the signal regenerated by the method of detecting the signal described above, the received signal is matched and filtered to obtain information such as the presence or absence of the signal, the reception level, and the time delay.

In the above, the Wi-Fi method has been described, but is not limited thereto. As described above, as in the case of a signal transmitted through Bluetooth or Bluetooth long range, the detection range can be increased by regenerating various unlicensed band signals or ultra-wideband signals as long as they do not contradict the technical idea of the present disclosure.

According to an example, at least one of the first communication unit 110 and the second communication unit 120 may be integrally configured with the signal measurer 100 or may be configured as a communication unit of another terminal communicatively connected to the signal measurer. The signal measurer 100 may be implemented to be connected to a separate terminal such as a smartphone or tablet. In this case, according to an example, the signal measurer 100 may be implemented in the form of a terminal cover or case that is communicatively connected to the corresponding terminal.

For example, the signal measurer 100 uses a device included in another terminal as the first communication unit 110 when it is necessary to use a device of a first communication method such as mobile communication to measure the location of a target terminal. can The signal measurer 100 may use a corresponding device included in another terminal as the second communication unit 120 when it is necessary to use an unlicensed band or ultra-wideband communication device to measure the location of the target terminal.

20 is a diagram showing the configuration of a terminal 200 according to an embodiment of the present disclosure.

According to an example, the terminal 200 determines whether the signal measurer and location measurement are performed through the third communication unit 210 using the third communication method, the second communication unit 220 using the second communication method, and the third communication unit. information is exchanged, and when location measurement is requested, a signal of the second communication method is output through the second communication unit, and whether the signal of the second communication method is output or channel setting information of the second communication method is transmitted to the signal measurer. It may include a control unit for transmitting through the third communication unit.

Here, the terminal is a target terminal subject to location measurement, and the third communication method may include a mobile communication method using a licensed band. In addition, the second communication method may include a communication method using an unlicensed band or ultra wide band (UWB).

For positioning using the second communication method, the control unit 230 may exchange channel setting information or whether a link is formed through the second communication method with the signal measurer with the target terminal through the third communication unit 210. To this end, according to an example, the control unit 230 may form a link with the signal measurer using the third communication method. In this case, the control unit 230 may receive channel setting information about whether a link is formed through the signal measurer and the second communication method and a channel for transmitting a signal of the second communication method through a corresponding link. According to an example, information on whether a link is formed through the second communication method may include identification information of an unlicensed band or ultra-wideband device for link formation.

The control unit 230 may transmit a signal of the second communication method through the second communication unit 220 by forming a link using the second communication method with the target terminal based on the corresponding information. Alternatively, the control unit 230 may output a signal of the second communication method through the second communication unit 220 without forming a link using the signal measurer and the second communication method based on the corresponding information. That is, the target terminal transmits signals of the second communication method to the outside based on information exchanged through the third communication method device without going through the link formation operation of the signal measurer with the second communication method device for unlicensed band or ultra-wideband signals. can be output as

According to an example, the control unit 230 may perform an operation related to the output of a signal of the second communication method performed using the second communication unit for positioning by information included in an application installed in the terminal 200 or the terminal 200. It can be controlled based on the functions included in the operating system of For the above operation, software of the target terminal may need to be changed. For example, software for controlling an unlicensed band communication device and an ultra-wideband communication device may be required in a target terminal. According to an example, the software may be installed in a target terminal in the form of a smart phone app and operate based on information of the corresponding app. Downloading and installation of the app follows a known method, and is not limited to a specific method.

Alternatively, the software may be implemented to be included in a part of the operating system of the smart phone. That is, the corresponding software may be added as a function of the operating system during the initial production of the terminal or through OS update thereafter.

When the control server controlling location measurement instructs to operate a communication module corresponding to the determined communication method, the target terminal may operate the corresponding communication module according to the instruction. Also, according to an example, the target terminal may provide a user interface related to a corresponding positioning operation on a display of the target terminal based on the information included in the software. Also, according to an example, the description of the software may be substantially equally applied to a signal measurer or a signal generator.

21 is a diagram showing the configuration of a signal generator 600 according to an embodiment of the present disclosure.

According to an example, the signal generator 600 determines the location of the communication unit 610 using a communication method using an unlicensed band or ultra wide band (UWB) and the target terminal, the communication unit It may include a control unit 620 capable of outputting the signal of the communication method through a control unit so that the signal of the communication method is output at two or more different places. In addition, a user who possesses the signal generator may set the signal of the communication method to be output at two or more different places. In this case, the signal generator additionally includes a location information acquisition device, obtains its own location information on the place where the signal is transmitted based on this, and transmits the information to the location measurement server, thereby facilitating location measurement of the target terminal. It can work. The location information obtaining device may be implemented using a device such as GNSS or Pedestrian Dead Reckoning (PDR) based on satellite signals.

The control unit 620 may transmit signals of a certain unlicensed band in various places. By transmitting the signal of the unlicensed band at two or more different locations, the control unit 620 can determine the location of the target terminal based on whether the target terminal receives the signal and the level of the received signal.

The control unit 620 may transmit signals of unlicensed band or ultra-wideband. Alternatively, the target terminal may inform the signal measurer or signal generator of the measurement result. Based on the above measurement, the location of the target terminal may be determined.

The control unit 620 transmits a signal in an unlicensed band after a determination or command for location measurement of the target terminal is given, so that interference in the corresponding band can be minimized in normal times. Alternatively, the control unit 620 may operate to transmit a signal of the unlicensed band after determining or receiving an instruction that the target terminal has arrived near or within a certain distance. That is, the signal may not be transmitted normally, but the signal may start to be transmitted after a determination of positioning of the target terminal is made or after it is determined that the target terminal arrives near the target terminal. Unlike this, while transmitting a signal at the first transmit power level in normal times, after a location measurement decision for the target terminal is made or after it is determined that the target terminal has arrived near the target terminal, the signal can be started to be transmitted at the second transmit power level. . In this case, the second transmission power level may be set higher than the first transmission power. The signal generator may receive a positioning start command from a user through an input device provided in the signal generator. The signal generator receiving the input starts transmitting a signal or transmitting power at a second transmission power level.

In addition, the control unit 620 may generate the communication method signal by applying unique identification information or parameters so as to be distinguished from the communication method signal output by other signal generators.

22 is a diagram showing the configuration of a positioning server according to an embodiment of the present disclosure.

According to an example, the location measurement server 400 uses an unlicensed band or ultra wide band (UWB) output from the signal generator when the location measurement of the communication unit 410 and the target terminal is determined. A search command for searching for a signal of a communication method is transmitted to a target terminal, a measurement result of the signal of the communication method output by a signal generator is received from the target terminal, and the location of the target terminal is determined based on the measurement result. It may include a controller 420 that calculates.

The control unit 420 may determine whether to measure a position through an unlicensed band or an ultra-wideband communication device based on predetermined conditions. When the corresponding condition is satisfied, the control unit 420 may determine to perform positioning using an unlicensed band or ultra-wideband communication device and transmit the search command. When a signal of a communication method using unlicensed band or ultra-wideband is output from the signal generator, the corresponding search command may be transmitted to the target terminal. Conversely, when a signal of a communication method using unlicensed band or ultra-wideband is output from the target terminal, the corresponding search command may be transmitted to the signal measurer.

According to an example, the predetermined condition may be that the target terminal or signal measurer is located in an area where positioning is performed using an unlicensed band or ultra-wideband communication device. Alternatively, it may be a condition that at least one signal measurer exists within a predetermined distance from a position where the target terminal is expected to be located.

According to an example, the controller 420 may be configured to first determine whether to perform location measurement based on an uplink signal of a mobile communication system when location measurement of a target terminal starts. The controller 420 may transmit the search command to the signal measurer to measure the location by measuring the uplink signal of the target terminal when a predetermined condition for location measurement based on the uplink signal of the mobile communication system is satisfied. According to an example, the predetermined condition may be that a target terminal or a signal measurer is located in an area where mobile communication uplink location measurement is performed. Alternatively, the predetermined condition may be that at least one signal measurer exists within a predetermined distance from a position where the target terminal is expected to be located.

According to this, by measuring the signal transmitted from the unlicensed band communication device or the ultra-wideband communication device installed in the mobile communication terminal to measure the location of the terminal, the location measurement of the terminal in the shadow area of mobile communication and the location of low price measurement may be possible.

Also, the terms "system", "processor", "controller", "component", "module", "interface", "model", "unit", etc. are generally used to refer to computer-related entities hardware, combinations of hardware and software, It can mean software or running software. For example, but is not limited to, a process driven by a processor, a processor, a controller, a control processor, an object, a thread of execution, a program, and/or a computer. For example, a component can be both an application running on a controller or processor and a controller or processor. One or more components can reside within a process and/or thread of execution and a component can be located on one system or distributed across two or more systems.

Standard contents or standard documents mentioned in the foregoing embodiments are omitted to simplify the description of the specification and constitute a part of the present specification. Therefore, adding some of the contents of the above standard contents and standard documents to this specification or describing in the claims should be construed as falling within the scope of the present invention.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (15)

a first communication unit using a first communication method;
a second communication unit using a second communication method; and
Link formation or channel setting information for positioning using the second communication method of the target terminal is exchanged with the target terminal through the first communication unit, and the target terminal transmits based on the link formation or channel setting information A controller for measuring a signal of a second communication method through the second communication unit and calculating the location of the target terminal based on the measurement result or transmitting the measurement result to a location measurement server through the first communication unit signal meter. According to claim 1,
The first communication method,
Including a mobile communication method using a licensed band, a device-to-device (D2D) communication method, or a trunked radio system (TRS) communication method,
The second communication method,
A signal measuring device that includes a communication method using an unlicensed band or ultra wide band (UWB). According to claim 1,
Further comprising a signal measuring unit for measuring a licensed band signal transmitted and received between external devices,
The control unit,
When location measurement for the target terminal is requested, at least one communication method to be used for location measurement is selected from among the licensed band communication method and the second communication method of the target terminal based on a predetermined condition, and the selected at least one communication method is selected. A signal meter that measures the signal of the method. According to claim 3,
The predetermined condition is,
Whether or not selection information on the communication method to be used for location measurement is received, transmission power of the licensed band signal transmitted by the target terminal, handover possibility according to the licensed band communication method for the target terminal, distance from the target terminal or license A signal measuring device that includes support for location measurement using band signals. According to claim 1,
The control unit,
Among the data or fields included in the signal of the second communication method, sharing information about data or fields to be used for location measurement of the target terminal is received through the first communication unit, and based on the shared information, the data or fields A signal meter that regenerates at least some of it. According to claim 1,
The control unit,
A signal measurer for obtaining frequency offset information of a signal of a received second communication method, and transmitting the frequency offset information to another signal measurer or receiving it from another signal measurer. According to claim 6,
The control unit,
A signal measurer for transmitting or receiving the frequency offset information through a server communicating with the signal measurers. According to claim 1,
At least one of the first communication unit and the second communication unit,
A signal measurer configured integrally with the signal measurer, or composed of a communication unit of another terminal communicatively connected to the signal measurer. a third communication unit using a third communication method;
a second communication unit using a second communication method; and
Exchanges information on whether position measurement is performed with the signal measurer through the third communication unit, outputs a signal of a second communication method through the second communication unit when location measurement is requested, and signals of the second communication method A terminal including a control unit for transmitting whether or not to output or channel setting information of a second communication method to the signal meter through the third communication unit. According to claim 9,
The third communication method,
Including a mobile communication method using a licensed band,
The second communication method,
A terminal including a communication method using an unlicensed band or ultra wide band (UWB). According to claim 9,
The control unit,
A terminal for controlling an operation related to the output of a signal of a second communication method performed using the second communication unit based on information included in an application installed in the terminal or a function included in an operating system of the terminal. A communication unit using a communication method using an unlicensed band or ultra wide band (UWB); and
After the location measurement of the target terminal is determined, a signal transmission request is received through an input device, and a signal of the communication method is output through the communication unit, and the communication method signal is output at two or more different places. A signal generator including a control unit capable of According to claim 12,
The control unit,
A signal generator for generating a signal of the communication method by applying unique identification information or parameters so as to be distinguished from signals of the communication method output by other signal generators. communications department; and
When the location measurement for the target terminal is determined, a search command for searching for a signal of a communication method using an unlicensed band or ultra wide band (UWB) output by the signal generator is transmitted to the target terminal, and , A location measurement server including a controller that receives a measurement result of the signal of the communication method output from the signal generator from the target terminal, and calculates the location of the target terminal based on the measurement result. 15. The method of claim 14,
The control unit,
The location measurement server for transmitting the search command to the target terminal when the distance between the signal generator and the target terminal enters within a predetermined range.

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