WO2021107714A1 - Method and device for positioning target terminal in wireless communication system - Google Patents

Abstract

The present embodiments relate to a method and device for acquiring position information of a target terminal by using a wireless communication system. An embodiment provides a device and a method for positioning a target terminal, the device comprising: a configuration unit for configuring a setting parameter for receiving an uplink signal transmitted to a base station by a target terminal; a signal acquisition unit for acquiring, on the basis of the setting parameter, the uplink signal which has been transmitted by the target terminal according to the setting parameter; and an information extraction unit for extracting, on the basis of the uplink signal, information for enhancing calculation of a target terminal position or information which can estimate a target terminal state.

Description

Method and apparatus for measuring the location of a target terminal in a wireless communication system

The present embodiments relate to a method and apparatus for acquiring location information of a target terminal using a wireless communication system.

Recently, there have been attempts to obtain the location or movement information of a terminal existing in a specific area by a third party, not a telecommunication service provider, for public services. As an example of this, public organizations such as the Road Corporation and the National Police Agency attempted to obtain information such as the number or speed of terminals passing through a specific area.

In this situation, the reality is that there is no method for a third party other than a telecommunication service provider to obtain the location or traffic information of a terminal existing in a specific area for the purpose of public service. In particular, there is a restriction that the method of acquiring such information must be performed without affecting existing communication equipment and communication networks. In addition, it is necessary for the communication service provider to more accurately estimate the location of the terminal.

The present embodiments are intended to propose a method and apparatus for measuring the location of a target terminal using a wireless communication system.

In an embodiment devised according to the present task, in an apparatus for measuring the location of a target terminal, the target terminal is configured according to the configuration parameter and the configuration parameter for receiving an uplink signal transmitted to the base station by the target terminal. Includes a signal obtaining unit for obtaining the transmitted uplink signal based on a setting parameter, and an information extraction unit for extracting information for estimating the state of the target terminal or information for improving the location calculation performance of the target terminal based on the uplink signal To provide an apparatus for measuring the location of a target terminal.

Another embodiment is a method for measuring the location of a target terminal, in which the target terminal configures a setting parameter for receiving an uplink signal transmitted to a base station and an uplink signal transmitted by the target terminal according to the setting parameter It provides a method comprising: a signal obtaining step obtained based on a setting parameter; and an information extraction step of extracting information for estimating the state of the target terminal or information for improving the location calculation performance of the target terminal based on the uplink signal .

According to the present embodiment, it is possible to provide an effect of measuring the location of the target terminal using a wireless communication system, and there is an effect that more accurate location measurement is possible.

1 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to an embodiment.

2 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment.

3 is a diagram illustrating a PUSCH subframe structure in a conventional LTE communication system.

4 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment.

5 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment.

6 is a diagram for explaining an uplink signal transmitted by changing a reference signal according to an embodiment.

7 and 8 are diagrams for explaining an embodiment of a process in which a setting parameter is transmitted.

9 to 11 are diagrams exemplarily illustrating the structure of an uplink signal to which a configuration parameter is applied according to an embodiment.

12 is a flowchart illustrating a method of measuring a location of a target terminal according to an embodiment.

13 is a flowchart illustrating an operation of a base station according to an embodiment.

14 is a flowchart illustrating an operation for measuring a location of a target terminal according to an embodiment.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the present embodiments, if 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 thereof will be omitted.

In the present 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, and as well as UE (User Equipment) in WCDMA, LTE, HSPA and IMT-2020 (5G or New Radio), etc., MS (Mobile Station) in GSM, UT (User Terminal), SS (Subscriber Station), and should be interpreted as a concept including all of the wireless device (wireless device).

A base station or cell generally refers to a station that communicates with a user terminal, and includes a Node-B (Node-B), an evolved Node-B (eNB), gNode-B (gNB), and a Low Power Node (LPN). ), sector, site, various types of antennas, base transceiver system (BTS), 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), small cell (small cell), etc.

In the various cells listed above, since there is 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 the device itself providing a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or 2) may indicate the radio area itself. In 1), the 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, a transmission/reception point, a transmission point, a reception point, etc. become an embodiment of a base station according to a configuration method of a radio area. In 2), the radio area itself in which the signal is received or transmitted from the viewpoint of the user terminal or the neighboring base station may be indicated to the base station.

In the present specification, a cell is a component carrier having a coverage of a signal transmitted from a transmission/reception point or a coverage of a signal transmitted from a transmission/reception point, and the transmission/reception point itself. can

In this specification, the user terminal and the base station are used in an inclusive sense as two (Uplink or Downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by the term or word specifically referred to. does not In addition, the device for measuring the location of the target terminal in the present specification means a terminal or a separate device capable of measuring the location of the target terminal, and there is no limitation on the device.

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

For uplink transmission and downlink transmission, a time division duplex (TDD) method transmitted using different times may be used, and a frequency division duplex (FDD) method transmitted using different frequencies, a TDD method and an FDD method may be used. Mixed methods may be used.

In addition, in a wireless communication system, a standard is configured by configuring an uplink and a downlink based on one carrier or a pair of carriers.

The uplink and downlink transmit control information through a control channel such as a Physical Downlink Control CHannel (PDCCH), a Physical Uplink Control CHannel (PUCCH), etc., and a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), etc. It consists of the same data channel and transmits data.

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

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

Meanwhile, High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The base station performs downlink transmission to the 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 main physical channel for unicast transmission, and scheduling grant information for transmission in an uplink data channel. A control channel may be transmitted. Hereinafter, the transmission and reception of a signal through each channel will be described in the form of transmission and reception of the corresponding channel. The base station may transmit resource allocation information to the terminal through the PDCCH, and the base station may also allocate resources to the terminal through the PDSCH and A control signal for signal transmission may be transmitted.

There is no limitation on the multiple access scheme applied in the wireless communication system. 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 Sparse Code Multiple Access (SCMA) and Low Density Spreading (LDS).

One embodiment of the present invention is asynchronous wireless communication evolving to LTE/LTE-Advanced, IMT-2020 through GSM, WCDMA, HSPA, and synchronous wireless communication evolving to CDMA, CDMA-2000 and UMB for resource allocation. can be applied.

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

In the present specification, a NB-IoT (NarrowBand Internet of Things) terminal means 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-cost terminal cost, low power consumption, and optimized network structure.

As a typical usage scenario in NR (New Radio) currently under discussion 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 specification, 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) in the present specification can be interpreted in various meanings used in the past or present or used in the future.

In this specification, LTE technology is mainly described for convenience of explanation and understanding, but the contents of this specification may be equally applied to 5G NR. Accordingly, a subframe described below may be replaced with a slot in NR, and TTI means one scheduling unit, and may be replaced with a slot or minislot in NR. In addition, descriptions based on LTE may be replaced with NR terms having the same function in 3GPP.

Meanwhile, in the present disclosure, an apparatus for measuring the location of the target terminal by obtaining an uplink signal of the target terminal will be described as an apparatus for measuring the location of the target terminal. However, these terms are for the convenience of understanding, and may be described by being replaced with terms such as an information collecting device, a signal measuring device, and a position measuring device, if necessary. That is, the above terms should be understood to refer to the same object.

Recently, there have been attempts to obtain the location or movement information of a terminal existing in a specific area by a third party, not a telecommunication service provider, for public services. As an example of this, public organizations such as the Road Corporation and the National Police Agency have attempted to obtain information such as the number or speed of terminals passing through a specific area.

In this situation, the reality is that there is no method for a third party other than a telecommunication service provider to obtain the location or traffic information of a terminal existing in a specific area for the purpose of public service. In particular, there is a restriction that the method of acquiring such information must be performed without affecting existing communication equipment and communication networks. In addition, it is necessary for the communication service provider to more accurately estimate the location of the terminal.

The present disclosure has been devised to solve the above-described problems, and there is no limitation on its use.

1 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to an embodiment.

Referring to FIG. 1 , the apparatus 100 for measuring the location of a target terminal includes a configuration unit 110 that configures a setting parameter for receiving an uplink signal transmitted from a target terminal to a base station and a target terminal according to the setting parameter. Information for extracting information for estimating the state of the target terminal or the information for improving the position calculation performance of the target terminal based on the signal obtaining unit 120 and the uplink signal that obtains the transmitted uplink signal based on the configuration parameter An extractor 130 may be included. The apparatus 100 for measuring the location of the target terminal refers to a device that performs a role of measuring an uplink signal of the target terminal for which the location is to be measured, and may be described as a signal measuring device if necessary. Accordingly, the apparatus for measuring the location of the target terminal in the present specification may be understood as being replaced with a signal measuring device, and there is no limitation on the term.

The apparatus 100 for measuring the location of the target terminal may measure the location of the target terminal by collecting an uplink signal transmitted from the target terminal. Alternatively, the apparatus 100 for measuring the location of the target terminal may help to measure the location of the target terminal by collecting an uplink signal transmitted from the target terminal and transmitting it to the server.

Information for improving the location calculation performance of the target terminal in the present specification is used to include information necessary for location information of the target terminal or help information that helps to improve the location accuracy of the target terminal, and information necessary for the location information of the target terminal. . Hereinafter, it is described as location information as necessary, but this is exemplarily described for the convenience of understanding and description, and may be replaced with information helpful in estimating location as well as location information. Similarly, information capable of estimating the target terminal state in the present specification can be described and described as terminal state information, but this not only means direct terminal state information, but also information that can be used to estimate/calculate terminal state information used in an all-encompassing sense.

To this end, the configuration unit 110 may receive and configure a setting parameter for receiving an uplink signal transmitted by the target terminal from the base station. The configuration parameter may also be received by the target terminal, and the target terminal may transmit an uplink signal using the configuration parameter. Alternatively, the setting parameters may be configured in advance.

For example, the setting parameter may include at least one of transmission information of an uplink signal, reference signal pattern information included in an uplink signal, reference signal sequence information, data information included in an uplink signal, and decoding information of an uplink signal. may include.

For example, the transmission information of the uplink signal may include whether the target terminal transmits an uplink signal according to the configuration parameter or radio resource information for transmitting the uplink signal according to the configuration parameter. For example, the target terminal may transmit an uplink signal to which the configuration parameter is applied. The base station may include activation indication information for indicating whether to transmit an uplink signal to which the configuration parameter is applied in the configuration parameter. The apparatus 100 for measuring the location of the target terminal receives the activation indication information, checks whether the target terminal transmits an uplink signal for location measurement, and receives an uplink signal according to a setting parameter of the target terminal. position can be measured. As another example, the transmission information of the uplink signal may include radio resource information including time and frequency resources of the uplink signal transmitted by the target terminal. The target terminal may transmit an uplink signal to which a setting parameter is applied based on radio resource information using a corresponding time period and frequency resource. The apparatus 100 for measuring the location of the target terminal may collect an uplink signal for measuring the location of the target terminal by using radio resource information of a configuration parameter.

As another example, the reference signal pattern information may include at least one of information on the type of reference signal included in the uplink signal, density information of the reference signal, and symbol information to which the reference signal is allocated. For example, the reference signal pattern information is included in the uplink signal so that the apparatus 100 for measuring the location of the target terminal more accurately and efficiently measures the location of the target terminal compared to the general uplink signal transmitted by the target terminal. It may include pattern information for modifying the shape, type, frequency, etc. of a reference signal (RS). For example, the reference signal pattern information may include information on the type of reference signal included in the uplink signal. That is, the uplink signal may include a demodulation reference signal (DM-RS), a sounding reference signal (SRS), and the like. In addition, information on how many symbols the DM-RS or SRS is included in one subframe (slot in NR) may be included based on the density information of the reference signal. Alternatively, the symbol information to which the reference signal is allocated may include information on which symbol to which the reference signal included in the uplink signal is allocated. Alternatively, in the case of an LTE system, the reference signal pattern information may include CP type information of the uplink channel because the symbol position to which the DM-RS is allocated varies according to the CP length of the uplink. The apparatus 100 for measuring the location of the target terminal may more efficiently detect an uplink signal for location measurement using a reference signal included in the uplink signal. In addition, the base station may transmit information on which sequence is used as the DM-RS and SRS. For example, the information on the sequence may be directly transmitted to the apparatus 100 for measuring the location of the target terminal or may be transmitted through a location measurement server. Alternatively, the above-described information may be previously agreed between the apparatus 100 for measuring the location of the target terminal, the base station, and the target terminal, and the target terminal may transmit an uplink signal using the preset setting parameters and sequence. can

As another example, the data information included in the configuration parameter may include data type information included in the uplink signal according to the configuration parameter or phase information for each symbol. For example, the data information may include information on data included in a data region of an uplink signal to which a setting parameter is applied for position measurement. For example, when the target terminal transmits an uplink signal according to a configuration parameter, all null data may be included in the data region. Alternatively, the target terminal may transmit a predetermined pattern so that the apparatus 100 for measuring the location of the target terminal can know in advance the signal transmitted to the data area. Alternatively, the base station may transmit information on the data pattern of the above-described data region to the apparatus 100 for measuring the location of the target terminal using a separate communication channel. For another example, when transmitting an uplink signal according to a configuration parameter, the target terminal may transmit the same data of the same phase or a different phase for each symbol. Through this, the apparatus 100 for measuring the location of the target terminal can check the reference signal of the uplink signal as well as the data area information, so that the uplink signal can be collected more accurately and efficiently to be used for measuring the location of the target terminal. can

As another example, data transmitted through uplink may be encrypted and transmitted. In this case, even if the data pattern is predetermined, the data actually transmitted by scrambling for uplink encryption or the encoder may be changed. Accordingly, the apparatus 100 for measuring the location of the target terminal needs to know scrambling or encoding information. To this end, the base station may notify the above-described information to the apparatus 100 for measuring the location of the target terminal. For example, the decoding information of the uplink signal may include encryption information for decoding an uplink signal transmitted according to a configuration parameter, scrambling information, and information indicating whether to encode the uplink signal. For example, the apparatus 100 for measuring the location of the target terminal needs to obtain encryption information in advance in order to decode data information of an uplink signal. To this end, the configuration parameter may include encryption information or scrambling information for an uplink signal. In addition, the uplink signal for position measurement may not be encoded or scrambled. In this case, the decoding information of the uplink signal may include information indicating whether the corresponding uplink signal is encoded or scrambled.

The apparatus 100 for measuring the location of the target terminal using the above-described configuration parameter may acquire an uplink signal transmitted by the target terminal by acquiring it from the base station. The method for the apparatus 100 for measuring the location of the target terminal to receive the configuration parameter may be a method in which the base station directly receives a downlink signal transmitted to the target terminal or a method in which it is obtained through a server. In addition, the apparatus 100 for measuring the location of the target terminal may acquire the setting parameter through various methods, and there is no limitation on the acquisition method.

The signal acquisition unit 120 may collect an uplink signal transmitted by the target terminal by using the received configuration parameter. For example, the signal acquisition unit 120 may collect an uplink signal based on a correlation value between a reference signal pattern used for an uplink signal and a received signal according to a setting parameter. Alternatively, the signal acquisition unit 120 may collect the uplink signal based on a correlation value between the data information used for the uplink signal and the received signal according to a setting parameter.

The signal acquisition unit 120 may acquire an uplink signal based on a correlation value between a reference signal pattern or data information used for the uplink signal and the received signal. For example, there is no limitation on the correlation analysis method of the signal acquisition unit 120 . The signal acquisition unit 120 may acquire an uplink signal of the target terminal based on a correlation value obtained as a result of correlation analysis. Alternatively, the signal acquisition unit 120 may measure the received energy of the reference signal based on the correlation value, and obtain an uplink signal based on the measured received energy.

The information extractor 130 may extract information for improving the location calculation performance of the target terminal or information for estimating the state of the target terminal based on the acquired uplink signal. The information extracted by the information extraction unit 130 may include a reception power level of an uplink signal or a signal reception time, a time delay, and the like. As described above, the information extraction unit 130 may directly extract location information as well as information helpful in calculating location information. Similarly, the information extraction unit 130 may extract information helpful in estimating the state of the target terminal as well as the target terminal state information.

As described above, the apparatus 100 for measuring the location of the target terminal directly measures the location of the target terminal, or extracts information used for location measurement and transmits it to a server or other device to indirectly help the location measurement . If the device 100 for measuring the location of the target terminal directly measures the location of the target terminal, the device 100 for measuring the location of the target terminal receives information about the target terminal from another device or server, Using this, the location of the target terminal may be measured.

On the other hand, the information extractor 130 extracts information helpful for estimating the state of the target terminal as well as location information of the target terminal (including the uplink signal reception direction and strength information helpful for location measurement) from the acquired uplink signal. can also be extracted.

For example, the information for estimating the target terminal state is calculated based on the phase pattern for each symbol of the reference signal included in the uplink signal, and may include transmit power information or power state information of the target terminal. That is, when a reference signal is allocated to each symbol according to a setting parameter, transmission power or power state information of the target terminal may be obtained based on the phase pattern of each symbol. Matching information between the phase pattern of each symbol and the transmission power or power state may be configured in advance.

The apparatus 100 for measuring the location of the target terminal through the above-described operation may be used directly or indirectly to measure the location of the target terminal by collecting an uplink signal transmitted from the target terminal. Through this, the location measurement of the target terminal for public safety can be performed more quickly and accurately.

Hereinafter, various operating embodiments of the entire system including the apparatus 100 for measuring the location of the target terminal will be described with reference to the drawings. Each of the embodiments described below may be performed by the apparatus 100, the base station, or the server for measuring the location of the target terminal individually or in combination in any combination.

2 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment.

Referring to FIG. 2 , the components of the apparatus 100 for measuring the location of a target terminal may be described from a different perspective. The apparatus 100 for measuring the location of the target terminal may include a downlink signal receiver 210 for receiving a signal transmitted by the base station, and an uplink signal receiver 220 for receiving a signal transmitted by the target terminal. have. Also, the apparatus 100 for measuring the location of the target terminal may receive downlink and uplink through one antenna 200 . Of course, two or more antennas may be provided to receive downlink and uplink signals, respectively. In addition, the controller 230 for obtaining the above-described signal, information extraction, and the like may be provided.

For example, the apparatus 100 for measuring the location of the target terminal includes an apparatus for receiving uplink resource allocation information transmitted from a wireless communication system and an uplink receiver, and a corresponding uplink based on the uplink resource allocation information. By checking whether there is a terminal transmitting a signal in the link resource, location information of the terminal can be obtained based on the size of the signal. Accordingly, the apparatus 100 for measuring the location of the target terminal according to the present disclosure may receive both uplink and downlink signals, unlike a mobile communication terminal or a base station.

In the structure of FIG. 2 , both downlink and uplink signals are received through one antenna 200 . In addition, the apparatus 100 for measuring the location of the target terminal may control the uplink signal receiver 220 and the downlink signal receiver 210 to interwork through the controller 230 . However, in the structure of FIG. 2 , an uplink antenna and a downlink antenna may be used separately, and a plurality of uplink antennas and an uplink receiver may be used.

Also, one or more apparatuses 100 for measuring the location of the target terminal may be disposed adjacent to the target terminal for which the location is to be measured. The apparatus 100 for measuring the location of the target terminal receives a signal transmitted from the target terminal, measures information such as signal strength, arrival time delay, and reception direction of the received signal, and calculates the location of the target terminal based on this do. In the method of calculating the location, the information measured by the apparatus 100 for measuring the location of one or more target terminals may be transmitted to the location measurement server, and the location measurement server may calculate the location of the target terminal. The calculated location information of the target terminal may be transmitted to the apparatus 100 for measuring the location of each target terminal. Another method is to share measurement information between the devices 100 for measuring the location of the target terminal, and to measure the location of the target terminal in the apparatus 100 for measuring the location of one or more target terminals. If the device 100 for measuring the location of one target terminal calculates the location of the target terminal, the calculated information may be transmitted to the device 100 for measuring the location of another target terminal and shared. In , the base station establishes a link with the target terminal to perform communication, and the base station may allow the target terminal to transmit an uplink signal. To this end, the base station transmits uplink resource allocation information to the target terminal.

As described above, the apparatus of the present disclosure measures the signal transmitted by the target terminal and acquires the presence or absence of the target terminal, location information, and distance information to the device in this embodiment based on this. In this process, the target terminal's The apparatus 100 for measuring a location may measure information such as a signal size and time delay of a target terminal.

In order to improve the positioning performance of the target terminal, it is necessary for the apparatus for measuring the location of the target terminal to be able to detect the uplink signal of the target terminal from a longer distance and to measure more accurately. The present disclosure proposes a method for a target terminal to transmit an uplink signal to improve positioning performance and a method for measuring the same. In addition, a method of operating a base station that configures a signal transmitted by a target terminal is proposed. In addition, a position locator (a device for measuring the position of a target terminal) that detects and measures a signal based on an uplink signal transmitted by a target terminal is proposed.

In the present specification, a case in which a target UE transmits a Physical Uplink Shared Channel (PUSCH) in uplink for positioning will be described. As described above, the uplink signal is not limited to the PUSCH. In the LTE system, terminals transmit PUSCH for uplink data transmission. On the other hand, the device for measuring the position of the target terminal described above will be described below as a position finder or a signal collector, but is not limited to these terms.

3 is a diagram illustrating a PUSCH subframe structure in a conventional LTE communication system.

Referring to FIG. 3 , in the LTE system, there are two types of a CP (cyclic prefix) with a long CP and a short CP. When a short CP such as 310 is used, 14 OFDM symbols are included in one subframe of 1 ms, and a reference signal for demodulating the PUSCH is transmitted to the 4th and 11th symbols. On the other hand, when a long CP such as 320 is used, 12 OFDM symbols are included in one subframe of 1 ms, and a reference signal is transmitted to the 3rd and 9th symbols.

In the conventional PUSCH, only two reference signals are transmitted in every subframe, and as the number of reference signals increases, it is easier for a position locator to detect or measure a signal of an uplink PUSCH of a target terminal. In consideration of this point, a method for a target UE to transmit a PUSCH signal according to an embodiment will be described.

First, this embodiment describes a method and apparatus for a position finder to obtain time synchronization for an uplink signal of a target terminal for obtaining information on a location of a specific terminal in a wireless communication system, in particular, a mobile communication system do. The device described in this embodiment configures an appropriate uplink signal detection time window based on the location and configuration information of the cell in the cell of the mobile communication system, and detects the signal of the target terminal based on the window. . Accordingly, the applicable products and methods of the present embodiments can be applied to not only traffic information and public services through a wireless communication system, but also accurate location information services of a terminal using a mobile communication system.

To this end, the position finder (device for measuring the position of the target terminal) may be configured in various forms.

4 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment. 5 is a diagram illustrating a configuration of an apparatus for measuring a location of a target terminal according to another embodiment.

Referring to FIG. 4 , the location locator includes a downlink receiver 410 for receiving an LTE downlink signal and an uplink receiver 420 for receiving an uplink signal transmitted by a target terminal. In addition, it may include a communication device 430 for communication with a base station or a server. The location finder may receive the GPS receiver 440 for measuring its own location, and may include a display 450 for visually outputting the location and various information of the target terminal or location finder. Also, the position measuring device may include an input device 450 for receiving input information. The input device 450 may be configured as a touch interface as well as a physical button, and may receive an input signal through various interfaces such as voice. In addition, the position measuring device may include a control device 400 for controlling each of the above-described components. The control device 400 may perform an operation for controlling each component or interworking between each component.

As another example, referring to FIG. 5 , the location locator 100 may include the aforementioned downlink receiver 410 , uplink receiver 420 , a GPS receiver 440 , and a controller 400 . In this case, the position measuring device 100 may be controlled by another device such as a smart phone or tablet 500, the input device 510 provides an input signal to 500 devices, and the position measuring device 100 is 500 devices. can be controlled through In this case, the position measuring device 100 can be reduced in size and weight, and can be controlled by various devices by installing the application in 500 devices.

In addition to this, the position measuring device may be implemented in various forms including the functions of FIG. 1 described above.

Meanwhile, as described in FIG. 3 , two DM-RSs are transmitted in one TTI in the LTE system. Data is transmitted in the remaining symbols. As for the symbol in which the DM-RS is transmitted, the signal collector (position locator) can acquire information about the pattern in advance, and the detection performance thereof is high. On the other hand, there is a problem in that the detection performance of a symbol through which data is transmitted cannot be known what is transmitted data. In this case, the position finder may detect and measure the uplink signal of the target terminal using only the DM-RS symbol that can know the transmitted waveform in advance.

In one embodiment, the base station may give a command so that the target terminal simultaneously transmits the PUSCH as well as the SRS to the TTI in which the location locator measures the signal of the target terminal.

6 is a diagram for explaining an uplink signal transmitted by changing a reference signal according to an embodiment.

Referring to FIG. 6 , the target UE may be configured to transmit the PUSCH in one TTI as well as the SRS in the last symbol. The base station also transmits the setting parameters including the information on the channel setting to the position finder. The configuration parameters may include timing information and channel configuration information for a TTI through which the PUSCH transmits an uplink signal. In particular, the DM-RS transmitted on the PUSCH may include parameters necessary for calculation of the SRS as well as information on whether to transmit the SRS. In addition, the setting parameter may include a parameter for the transmission power of each part.

The location locator detects an uplink signal of the target terminal at the TTI in which the target terminal transmits the PUSCH based on the configuration parameters of the target terminal. To this end, the positioner generates a pattern of DM-RS and SRS transmitted by the target terminal based on the transmitted parameter, calculates a correlation value for the pattern for the uplink received signal, and based on this, the uplink of the target terminal It can detect and measure signals. In particular, the position finder may calculate the correlation value for the SRS as well as the signal correlation value for the DM-RS and detect or measure the uplink signal of the target terminal based on the calculation. In one embodiment, the position locator may calculate and combine the received energy of the DM-RS part and the received energy of the SRS, and use the combined value to detect and measure an uplink signal.

Alternatively, the position locator may obtain information on data or modulation symbols transmitted by the target terminal through uplink, calculate a correlation value or receive energy of a data bit portion based on this, and use it for detection and measurement.

To this end, the base station may configure the target terminal to include predetermined data in the PUSCH transmitted for measurement. For example, when there is no data to be transmitted by the target terminal, the base station may transmit an uplink signal and null data may be transmitted in the PUSCH. The base station notifies the location locator of whether such null data is transmitted. For example, null data may mean a message transmitted when an uplink transmission request is received even when there is no data to be transmitted to the base station by the terminal.

As another method, the base station may instruct the target terminal to transmit known data in advance. For example, the base station may instruct the target terminal to transmit data of a specific pattern. As another example, the base station may repeatedly transmit a command for transmitting data of a specific pattern so that the target terminal transmits data of the specific pattern through the PUSCH at a predetermined time. The base station also transmits information about the data pattern transmitted by the target terminal to the location finder, and the location finder generates a data pattern transmitted by the target terminal based on information received from the base station. The location locator may detect and measure the PUSCH transmitted by the target terminal based on this.

For example, the base station may set to transmit information on the specification or unique number of the terminal, and may command to repeatedly transmit the information. Such data means data by which the base station can predict in advance which message the terminal will transmit, and there is no limitation on the type of data. The base station obtains the information and informs the position finder so that the locator can control the position finder to use it to calculate a correlation value for the data part.

As another method, the base station may demodulate and receive the uplink data transmitted by the target terminal, and transmit information on the data to the location locator. The locator demodulates data of the target terminal based on the received information. In this case, the data pattern set after the point of time when the PUSCH is received is transmitted. Therefore, the position finder stores the signal at a specific time of the target terminal in the storage device, generates an uplink signal pattern after the base station transmits information about the data pattern, calculates a correlation value with the stored signal, and based on this to detect and measure an uplink signal.

Meanwhile, when the position locator detects and measures an uplink signal based on a data symbol transmitted on the PUSCH, the transmitted data may be encrypted or scrambled. In this case, it may be difficult to completely recover the pattern of the data symbol transmitted by the target terminal only with the pattern for the data. An operation for solving this will be described below.

For example, encryption or scrambling of the target terminal for the aforementioned TTI period may be disabled. Through this, the positioner can easily calculate the pattern of uplink data symbols.

As another example, the base station of the mobile communication network may transmit information including an encryption key or an initial seed capable of deciphering encryption or scrambling of data symbols to the position locator. The position locator can easily obtain the data symbol of the PUSCH transmitted by the target terminal based on this information.

As another example, the mobile communication base station may transmit a message of the control plane rather than user data in the TTI through which the PUSCH for measurement is transmitted. Based on this, the location locator may detect or measure uplink data of the target terminal. Also, in this case, the control plane may not be encrypted or scrambled, and only data of the user plane may be encrypted or scrambled. The mobile communication base station may notify the location locator of whether the user plane or the control plane is encrypted or information of related parameters. Alternatively, the base station may notify the location measurement server of the above-described information, and the location measurement server may notify the location measurement server.

On the other hand, it is very important for the location finder to improve the signal detection or measurement performance of the target terminal for the presence or absence of the target terminal or for obtaining location information. In order to improve such detection or measurement performance, a new type of uplink measurement signal that does not exist in the conventional LTE standard may be defined. For example, in the conventional LTE system, the number of symbols of DM-RS or SRS in one TTI may be increased. That is, in the conventional LTE system, in a DM-RS or SRS transmission scheme of 1 or 2 symbols within one TTI, a format for transmitting more DM-RS or SRS symbols than before may be defined. For example, transmission of three or more DM-RSs in one TTI may be allowed in order to improve the detection and signal measurement performance of the target terminal of the location locator. Alternatively, it may be allowed to transmit two or more symbols of SRS in one TTI. In another embodiment, the DM-RS or SRS occupies a higher proportion of the uplink signal transmitted by the target UE in one TTI than the PUSCH for transmitting general data. The above-described TTI is a minimum unit in which the terminal transmits an uplink frame or data, and in the case of an LTE system, a unit of 1 ms.

The position locator detects or measures the uplink signal of the target terminal based on this new type of uplink signal transmission. That is, a new type of channel structure may be defined in order to improve the uplink detection performance of the target terminal.

In the above-described embodiments, a case has been described in which the base station of the mobile communication network directly transmits the data pattern transmitted to the PUSCH and information on the uplink channel configuration to the target terminal (locator). However, the same can be applied to the case where the base station transmits the above-mentioned information to the location measurement server and the location measurement server transmits the information to the target terminal (location measurer).

7 and 8 are diagrams for explaining an embodiment of a process in which a setting parameter is transmitted.

Referring to FIG. 7 , the base station 700 may transmit the above-described configuration parameters or information to the location locator 100 and the target terminal 720 through a downlink signal. The position locator 100 and the target terminal 720 transmit an uplink signal according to a setting parameter or information, and the position finder 100 may detect and measure it. Each position finder 100 , 101 , 102 may receive the above-described setting parameters or information from the same base station 700 , or may receive it from a different base station, respectively. That is, the position locator 100 may receive the downlink signal transmitted from the base station 700 to the target terminal 720 to obtain the above-described configuration parameters or information of the target terminal 720 .

Referring to FIG. 8 , the base station 700 may transmit the above-described configuration parameters or information to the target terminal 720 through a downlink signal. Also, the base station 700 may transmit the above-described setting parameters or information to the location measurement server 710 . The location measurement server 710 transmits setting parameters or information to the location measurement device 100 . The target terminal 720 may transmit an uplink signal according to a configuration parameter or information, and detect and measure it. Each position measuring device 100 , 101 , 102 may receive the above-described setting parameters or information from the same position measurement server 710 , or may receive it from a different position measurement server 710 . That is, the position locator 100 may obtain configuration parameters or information of the target terminal by using an arbitrary communication path other than the downlink signal transmitted by the base station 700 to the target terminal 720 .

9 to 11 are diagrams exemplarily illustrating the structure of an uplink signal to which a configuration parameter is applied according to an embodiment.

Referring to FIG. 9 , in the new type of PUSCH, all symbols in one TTI may be configured as DM-RSs. Alternatively, in the new type of PUSCH, all symbols may be composed of SRS. As such, more DM-RSs or SRSs than in the conventional PUSCH format may be transmitted in one TTI.

For example, a PUSCH is allocated to a target UE in one TTI. That is, all symbols in one TTI may be configured as reference signals as shown in FIG. 9 . In addition, since all reference signals are transmitted in the same phase, consecutive symbols may be coherently accumulated. In this case, the position locator can improve performance by coherently accumulating two or more consecutive symbols of a shared and received reference signal and detecting or measuring the same.

As another example, in the embodiment of FIG. 9 , a simple message may be transmitted by changing the phase between the respective reference signal symbols. That is, the position finder can transmit simple information by detecting a phase difference between each symbol. For example, the target terminal may transmit information on the transmit power level of a signal transmitted by the target terminal or the remaining amount of the battery by using the phase difference of each symbol. In this case, each position finder may detect a phase change between reference symbols and acquire information related to the remaining battery power and transmission power transmitted by the target terminal based on this. The position finder may calculate a path attenuation value by comparing the acquired transmission power information of the target terminal with the reception power received through the uplink. In another method, the position locator transmits information related to the transmission power of the target terminal to the position measurement server. The location measurement server may determine the transmit power value of the target terminal by combining the received values for the transmit power information of the target terminal transmitted by several location measurers. Based on this, the radio wave attenuation between the target terminal and the locator can be calculated.

For example, the target terminal may transmit information about the transmission power level transmitted by the target terminal by changing the code used for each symbol in the uplink signal. As another example, the target terminal may transmit an uplink signal by using a code of a predetermined pattern for each symbol, but with a different transmission phase between the symbols. If the target terminal transmits an uplink signal by changing the relative phases between symbols, the position locator obtains a correlation value for the signal of each symbol and calculates an energy value for the correlation value. Then, the position locator detects or measures the uplink signal of the target terminal by accumulating energy values between each symbol. A specific method for transmitting the above-described message may be configured in advance between the location locator and the target terminal. .

In addition, the location finder may transmit information related to the remaining battery level of the target terminal to the location measurement server. As an example, the location finder may transmit whether the target terminal is in a low battery state. Information related to the remaining amount of the battery is transmitted in a soft decision state. The location measurement server collects information related to the remaining battery power transmitted by several location measuring devices, and based on this, determines the final remaining battery level information. Accordingly, a request may be made to the mobile communication base station to change the uplink signal setting of the target terminal.

As described above, the present disclosure proposes a method for transmitting an uplink signal of a target terminal that can more reliably detect and measure a signal of a target terminal compared to a conventional LTE system. As another implementation of the above-described embodiment, a part or all of a data part of a PUSCH or a pattern of a modulated symbol may be transmitted in a predefined form. For example, one or more of these patterns may be defined and one of the patterns may be transmitted to the target terminal. The base station notifies the location locator of information on which pattern the target terminal uses among the patterns, and measures the signal based on the information.

Meanwhile, an object of the present disclosure is to obtain information on whether a target terminal exists near a specific location and information on the location by using an uplink signal transmitted by the target terminal. In order to improve the uplink performance of the target terminal and solve the problem of the interference signal, it is advantageous for the target terminal to transmit a wideband signal to increase transmission power and to allocate resources so that multiple terminals do not transmit signals at the same time. . In this way, when location measurement for several terminals is to be performed at the same time, resource allocation for this may be excessive. To this end, one TTI may be divided by two or more terminals to transmit an uplink signal.

With reference to FIG. 10, description will be made based on a short CP in an LTE system in which one TTI is 1 ms. One TTI may be divided by two terminals to transmit uplink. In FIG. 10 , the first terminal among 14 symbols in one TTI may transmit using the first 7 symbols. On the other hand, another terminal may transmit using the 7 symbols behind it.

11 shows an embodiment in which a long CP is used for a TTI of 1 ms. Referring to FIG. 11 , of 12 symbols in one TTI, target UE 1 transmits the first 6 symbols. On the other hand, the target UE 2 transmits using 6 symbols at the back. As described above, by using a symbol in one TTI for time division, multiple users share and use resources, so that more efficient transmission is possible.

Various methods are possible for a method of transmitting transmission information (eg, a configuration parameter) for the above-described uplink signal. As an example, the base station may define and deliver it to the PDCCH. For example, the length of the uplink signal and location information within one TTI may be transmitted through the PDCCH. Alternatively, the base station may notify the target terminal of transmission information (ex, a configuration parameter) in a signaling message (eg, a higher layer message such as an RRC message), and transmit only whether the resource allocation of the positioning signal is allocated to the PDCCH. Alternatively, the base station may periodically transmit a measurement signal through a signaling message.

Through the above-described operation, the location finder can measure the location, presence, etc. of the target terminal more accurately and efficiently.

Hereinafter, the operation of the above-described position measuring system will be briefly described once again with reference to a flowchart. Each step below may be performed by changing the mutual order or integrating or dividing into a specific step.

12 is a flowchart illustrating a method of measuring a location of a target terminal according to an embodiment.

Referring to FIG. 12 , the method of measuring the location of the target terminal may include a configuration step of configuring a setting parameter for the target terminal to receive an uplink signal transmitted to the base station (S1210).

The setting parameters may be received from a base station or a server. Alternatively, the setting parameter may be previously promised and stored in at least two or more of the base station, the target terminal, the server, and the apparatus for measuring the location of the target terminal.

For example, in the configuration step, a configuration parameter for receiving an uplink signal transmitted by the target terminal may be received from the base station. The configuration parameter may also be received by the target terminal, and the target terminal may transmit an uplink signal using the configuration parameter.

For example, the setting parameter may include at least one of transmission information of an uplink signal, reference signal pattern information included in an uplink signal, reference signal sequence information, data information included in an uplink signal, and decoding information of an uplink signal. may include.

For example, the transmission information of the uplink signal may include whether the target terminal transmits an uplink signal according to the configuration parameter or radio resource information for transmitting the uplink signal according to the configuration parameter. For example, the target terminal may transmit an uplink signal to which the configuration parameter is applied. The base station may include activation indication information for indicating whether to transmit an uplink signal to which the configuration parameter is applied in the configuration parameter. The apparatus for measuring the location of the target terminal receives activation indication information, checks whether the target terminal transmits an uplink signal for location measurement, and receives an uplink signal according to a setting parameter to measure the location of the target terminal can do. As another example, the transmission information of the uplink signal may include radio resource information including time and frequency resources of the uplink signal transmitted by the target terminal. The target terminal may transmit an uplink signal to which a setting parameter is applied based on radio resource information using a corresponding time period and frequency resource. The apparatus for measuring the location of the target terminal may collect an uplink signal for measuring the location of the target terminal by using radio resource information of a configuration parameter.

As another example, the reference signal pattern information may include at least one of information on the type of reference signal included in the uplink signal, density information of the reference signal, and symbol information to which the reference signal is allocated. For example, the reference signal pattern information includes the reference signal ( Reference Signal (RS) may include pattern information for changing the shape, type, frequency, and the like. For example, the reference signal pattern information may include information on the type of reference signal included in the uplink signal. That is, the uplink signal may include a demodulation reference signal (DM-RS), a sounding reference signal (SRS), and the like. In addition, information on how many symbols the DM-RS or SRS is included in one subframe (slot in NR) may be included based on the density information of the reference signal. Alternatively, the symbol information to which the reference signal is allocated may include information on which symbol to which the reference signal included in the uplink signal is allocated. Alternatively, in the case of an LTE system, the reference signal pattern information may include CP type information of the uplink channel because the symbol position to which the DM-RS is allocated varies according to the CP length of the uplink. The apparatus for measuring the location of the target terminal may more efficiently detect the uplink signal for location measurement by using the reference signal included in the uplink signal. In addition, the base station may transmit information on which sequence is used as the DM-RS and SRS. For example, the information on the sequence may be directly transmitted to the apparatus 100 for measuring the location of the target terminal or may be transmitted through a location measurement server. Alternatively, the above-described information may be previously agreed between the apparatus 100 for measuring the location of the target terminal, the base station, and the target terminal, and the target terminal may transmit an uplink signal using the preset setting parameters and sequence. can

As another example, the data information included in the configuration parameter may include data type information included in the uplink signal according to the configuration parameter or phase information for each symbol. For example, the data information may include information on data included in a data region of an uplink signal to which a setting parameter is applied for position measurement. For example, when the target terminal transmits an uplink signal according to a configuration parameter, all null data may be included in the data region. Alternatively, the target terminal may transmit a predetermined pattern so that the apparatus 100 for measuring the location of the target terminal can know in advance the signal transmitted to the data area. Alternatively, the base station may transmit information on the data pattern of the above-described data region to the apparatus 100 for measuring the location of the target terminal using a separate communication channel. For another example, when transmitting an uplink signal according to a configuration parameter, the target terminal may transmit the same data of the same phase or a different phase for each symbol. Through this, the apparatus for measuring the location of the target terminal can check the data area information as well as the reference signal of the uplink signal, so that the uplink signal can be collected more accurately and efficiently and used for measuring the location of the target terminal.

As another example, data transmitted through uplink may be encrypted and transmitted. In this case, even if the data pattern is predetermined, the data actually transmitted by scrambling for uplink encryption or the encoder may be changed. Accordingly, the apparatus 100 for measuring the location of the target terminal needs to know scrambling or encoding information. To this end, the base station may notify the above-described information to the apparatus 100 for measuring the location of the target terminal. For example, the decoding information of the uplink signal may include encryption information for decoding an uplink signal transmitted according to a configuration parameter, scrambling information, and information indicating whether to encode the uplink signal. For example, an apparatus for measuring the location of a target terminal needs to obtain encryption information in advance in order to decode data information of an uplink signal. To this end, the configuration parameter may include encryption information or scrambling information for an uplink signal. In addition, the uplink signal for position measurement may not be encoded or scrambled. In this case, the decoding information of the uplink signal may include information indicating whether the corresponding uplink signal is encoded or scrambled.

In the uplink signal obtaining step, the uplink signal transmitted by the target terminal may be collected by obtaining the above-described configuration parameters from the base station. The uplink signal acquisition may be a method in which a base station directly receives a downlink signal transmitted to a target terminal, or a method in which the uplink signal is obtained through a server. In addition to this, setting parameters may be acquired through various methods, and there is no limitation on the acquisition method.

Meanwhile, the method of measuring the location of the target terminal may include a signal obtaining step of obtaining an uplink signal transmitted by the target terminal based on the setting parameter according to the setting parameter (S1220).

For example, the signal obtaining step may collect the uplink signal based on a correlation value between a reference signal pattern used for the uplink signal and the received signal according to a setting parameter. Alternatively, the signal obtaining step may collect an uplink signal based on a correlation value between data information used for an uplink signal and a received signal according to a setting parameter.

The signal acquiring step may acquire an uplink signal based on a correlation value between a reference signal pattern or data information used for the uplink signal and a received signal. For example, there is no limitation on the correlation analysis method of the signal acquisition step. In the signal obtaining step, an uplink signal of the target terminal may be obtained based on a correlation value obtained as a result of the correlation analysis. Alternatively, the signal obtaining step may measure the received energy of the reference signal based on the correlation value, and obtain an uplink signal based on the measured received energy.

The method of measuring the location of the target terminal may include an information extraction step of extracting information for improving the location calculation performance of the target terminal or information for estimating the state of the target terminal based on the uplink signal (S1230). The information extracted by the information extraction step may include a reception power level of an uplink signal or a time at which the signal is received, a time delay, and the like.

On the other hand, the information extraction step includes information for improving the location calculation performance of the target terminal from the obtained uplink signal (including uplink signal reception direction and strength information helpful for location measurement) as well as information for estimating the state of the target terminal can also be extracted. For example, the information for estimating the target terminal state is calculated based on the phase pattern for each symbol of the reference signal included in the uplink signal, and may include transmit power information or power state information of the target terminal. That is, when a reference signal is allocated to each symbol according to a setting parameter, transmission power or power state information of the target terminal may be obtained based on the phase pattern of each symbol. Matching information between the phase pattern of each symbol and the transmission power or power state may be configured in advance.

Meanwhile, in order to apply the above-described embodiment, it is necessary to change the uplink transmission format defined in the existing LTE or make a new appointment. In this case, it is impossible for conventionally commercialized terminals to transmit the new format, and only new terminals implementing the changed format can transmit the format. That is, it is necessary to classify whether the operation of the present disclosure can be applied according to the terminal capability. For example, the base station determines whether a terminal capable of transmitting an uplink signal of a new format or not, and the base station sets uplink signal settings for measurement according to a function capable of generating an uplink signal of any type is supported. It can be set differently.

13 is a flowchart illustrating an operation of a base station according to an embodiment.

Referring to FIG. 13 , modem version information of the target terminal may be obtained ( S1310 ). For example, the base station may obtain version information (eg, modem version information or terminal capability information) of the target terminal from the terminal. Alternatively, the base station may acquire information on the type of an uplink transmission signal that the target terminal can transmit.

The base station determines whether a signal setting request for positioning to the target terminal is received (S1320). If the base station does not receive a request for setting a positioning signal for a specific terminal, the base station performs a normal operation (S1340). Contrary to this, when the base station receives a positioning signal setting request for a specific terminal, it is determined whether the target terminal receiving the positioning signal setting request supports a new type of positioning signal (S1330).

For example, when the target terminal does not support the new type of positioning signal, the base station requests to transmit the existing uplink signal as the positioning signal (S1350). On the contrary, when the target terminal supports a new type of positioning signal, the base station requests the target terminal to transmit a positioning uplink signal (S1360).

In this way, the base station may determine how to request transmission of the above-described uplink signal for positioning by using the terminal capability.

14 is a flowchart illustrating an operation for measuring a location of a target terminal according to an embodiment.

Referring to FIG. 14 , the location locator starts signal measurement for the target terminal (S1410). The position finder monitors whether the positioning signal setting information for the target terminal is received from the base station or the server (S1420). If the positioning signal configuration information for the target terminal is received, it is determined whether the target terminal transmits the positioning uplink signal (S1430). The determination may be performed based on information transmitted from the base station or the server.

If the target terminal transmits an uplink signal for positioning, the location finder searches and measures the signal of the target terminal by using the positioning parameter (S1450). Otherwise, the location locator searches for and measures the uplink signal of the target terminal by using the existing uplink signal configuration parameter (S1440).

Such an operation may be performed in conjunction with the operation of FIG. 13 .

Meanwhile, the position measuring device in the present disclosure may be implemented in various forms as shown in FIGS. 1, 2, 4, and 5 . For example, the locator includes an LTE downlink receiver and an LTE uplink receiver to receive a mobile communication signal. The LTE downlink receiver captures the initial downlink receiver of LTE to acquire system time synchronization, and serves to acquire a base station ID and system information. In addition, the downlink receiver may receive control information transmitted from the base station to the target terminal. The LTE uplink receiver detects the transmission signal of the target terminal based on the information of the uplink transmission resource allocated to the target terminal and calculates the arrival time and signal power of the signal. In this process, the uplink resource allocation information for the target terminal may be received through the downlink receiver, but the above-described information may be directly transmitted from the mobile communication system. Alternatively, it may be received via a location measurement server. In addition, it is possible to establish a communication link with the target terminal by using the resources (time, frequency, code, etc.) and transmission parameters agreed in advance between the mobile communication system and the position finder.

In addition, the position locator may obtain an absolute time reference and calculate the difference between the time points at which each position finder receives the uplink signal of the target terminal. For example, based on GPS signals, positioners secure temporal synchronization. However, in the present disclosure, another method may be used to secure time synchronization between different types of position locators or to distinguish a difference in time (time delay) at which an uplink radio signal arrives. For example, it can be applied if a high-precision watch is used and the synchronization between position measuring devices can be adjusted in advance or the relative difference can be calculated. In addition, location measurement may be performed based on a time difference between a time point at which a specific signal of the LTE downlink receiver is received and a time point at which an uplink signal of another user is received. This reception time or time delay information is transmitted to the location measurement server.

In addition, GPS may be used to measure the position of the locator of the present disclosure. In addition, information on absolute time can be obtained through GPS, and various position measuring devices can share information on time using the information.

In the present disclosure, when direct communication with a location measurement server or a base station or direct communication with another location measurement device is required, a separate communication device may be used. As shown in FIG. 4 , the implementation example of the location finder includes an output device such as a display to display the location of the target terminal to the user. In addition, an input device for a user's input is provided. Through the input device, the user inputs additional information, such as manually inputting information on the current location of the location measuring device, so that the accuracy of location measurement can be increased. In addition, information related to the target terminal and location measurement may be input through the input device, and commands related to call setup for the target terminal and operation of the location measurement server may be input. It includes a control unit for controlling the operation of such a position measuring device. The control unit performs a role of controlling information reception, measurement, communication, input/output, etc. described in this specification in connection with each device.

In addition, as shown in FIG. 5 , other smart phones or tablets may be used for the functions of the communication device and the input/output device. GPS can also be implemented using GPS in a smartphone or tablet.

In the case of time synchronization, it can be secured in various ways. For example, a downlink of a mobile communication system is received to secure downlink time synchronization. Then, the resource allocation information of the target terminal is secured, and uplink resource allocation information is obtained based on this. This process can be secured by receiving the downlink signal of the mobile communication system, and can also be performed by receiving resource allocation information from the mobile communication system. And, it is determined whether a target terminal exists by detecting an uplink signal based on the uplink resource allocation information.

The above description is merely illustrative of the technical spirit of the present disclosure, and various modifications and variations will be possible without departing from the essential characteristics of the present disclosure by those skilled in the art to which the present disclosure pertains. In addition, since the present embodiments are for explanation rather than limiting the technical spirit of the present disclosure, the scope of the present technical spirit is not limited by these embodiments. The protection scope of the present disclosure should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present disclosure.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is based on U.S. Patent Law 119 for Patent Application No. 10-2019-0157160 filed in Korea on November 29, 2019 and Patent Application No. 10-2020-0161677 filed in Korea on November 26, 2020 Priority is claimed under section (a) (35 USC § 119(a)), the entire contents of which are incorporated herein by reference. In addition, if this patent application claims priority for countries other than the United States for the same reason as above, all contents thereof are incorporated into this patent application by reference.

Claims (15)

1. In the apparatus for measuring the location of the target terminal,

   a configuration unit that configures a setting parameter for receiving an uplink signal transmitted from a target terminal to a base station;

   a signal obtaining unit for obtaining the uplink signal transmitted by the target terminal according to the setting parameter based on the setting parameter; and

   and an information extractor configured to extract information for estimating the state of the target terminal or information for improving the location calculation performance of the target terminal based on the uplink signal.
2. The method of claim 1,

   The setting parameters are

   At least one information of transmission information of the uplink signal, reference signal pattern information included in the uplink signal, reference signal sequence information, data information included in the uplink signal, and decoding information of the uplink signal A device for measuring the location of the target terminal.
3. 3. The method of claim 2,

   Transmission information of the uplink signal,

   Whether the target terminal transmits an uplink signal according to the configuration parameter or an apparatus for measuring a location of a target terminal including radio resource information for transmission of an uplink signal according to the configuration parameter.
4. 3. The method of claim 2,

   The reference signal pattern information,

   An apparatus for measuring a location of a target terminal including at least one of information on the type of reference signal included in the uplink signal, density information of the reference signal, and symbol information to which the reference signal is allocated.
5. 3. The method of claim 2,

   The data information is

   An apparatus for measuring a location of a target terminal including data type information or symbol-specific phase information included in the uplink signal according to the configuration parameter.
6. 3. The method of claim 2,

   The decoding information of the uplink signal,

   An apparatus for measuring the location of a target terminal including encryption information for decoding an uplink signal transmitted according to the configuration parameter, scrambling information, and information indicating whether to encode the uplink signal.
7. The method of claim 1,

   The uplink signal transmitted according to the setting parameter is,

   An apparatus for measuring a location of a target terminal in which a ratio of symbols to which the reference signal is allocated is set to be higher than that of an uplink signal to which the configuration parameter is not applied.
8. The method of claim 1,

   The setting parameters are

   An apparatus for measuring the location of a target terminal configured to transmit the uplink signal by two or more different target terminals within one TTI.
9. In the method of measuring the location of the target terminal,

   a configuration step of configuring, by a target terminal, a setting parameter for receiving an uplink signal transmitted to a base station;

   a signal obtaining step of obtaining the uplink signal transmitted by the target terminal according to the setting parameter based on the setting parameter; and

   and an information extraction step of extracting information for improving the location calculation performance of the target terminal or information for estimating the state of the target terminal based on the uplink signal.
10. 10. The method of claim 9,

    The setting parameters are

    At least one information of transmission information of the uplink signal, reference signal pattern information included in the uplink signal, reference signal sequence information, data information included in the uplink signal, and decoding information of the uplink signal Way.
11. 11. The method of claim 10,

    Transmission information of the uplink signal,

    Whether the target terminal transmits an uplink signal according to the configuration parameter or a method including radio resource information for transmission of an uplink signal according to the configuration parameter.
12. 11. The method of claim 10,

    The reference signal pattern information,

    A method comprising at least one of information on the type of reference signal included in the uplink signal, information on the density of the reference signal, and symbol information to which the reference signal is allocated.
13. 11. The method of claim 10,

    The data information is

    A method of including data type information or phase information for each symbol included in the uplink signal according to the configuration parameter.
14. 11. The method of claim 10,

    The decoding information of the uplink signal,

    A method comprising encryption information for decoding an uplink signal transmitted according to the configuration parameter, scrambling information, and information indicating whether to encode the uplink signal.
15. 10. The method of claim 9,

    The uplink signal transmitted according to the setting parameter is,

    A method in which a ratio of symbols to which the reference signal is allocated is set to be higher compared to an uplink signal to which the setting parameter is not applied.

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