WO2020076039A1 - Dispositif de mesure d'emplacement destiné à mesurer l'emplacement d'un terminal cible dans un système de communication sans fil et son procédé de mesure d'emplacement - Google Patents

Dispositif de mesure d'emplacement destiné à mesurer l'emplacement d'un terminal cible dans un système de communication sans fil et son procédé de mesure d'emplacement Download PDF

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Publication number
WO2020076039A1
WO2020076039A1 PCT/KR2019/013154 KR2019013154W WO2020076039A1 WO 2020076039 A1 WO2020076039 A1 WO 2020076039A1 KR 2019013154 W KR2019013154 W KR 2019013154W WO 2020076039 A1 WO2020076039 A1 WO 2020076039A1
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WIPO (PCT)
Prior art keywords
base station
location
measuring device
target terminal
information
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PCT/KR2019/013154
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English (en)
Korean (ko)
Inventor
문희찬
Original Assignee
한양대학교 산학협력단
주식회사 인포씨즈시스템
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020190124204A external-priority patent/KR20200040676A/ko
Application filed by 한양대학교 산학협력단, 주식회사 인포씨즈시스템 filed Critical 한양대학교 산학협력단
Priority to US17/283,403 priority Critical patent/US11997559B2/en
Priority to CN201980066543.4A priority patent/CN112840711A/zh
Priority to EP19871419.8A priority patent/EP3866520A4/fr
Publication of WO2020076039A1 publication Critical patent/WO2020076039A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management

Definitions

  • the present embodiments relate to a method and apparatus for positioning a target terminal using a wireless communication system.
  • a position measuring device for measuring the position of the terminal is proposed, but a method for securing time synchronization of the uplink signal of the target terminal has not been specifically proposed.
  • the position measuring device receives resource allocation and related information of the target terminal from the mobile communication system. Based on this, the uplink signal transmitted by the target terminal can be detected, and information such as the presence and location of the target terminal can be obtained. However, for uplink detection, it is very important to secure synchronization of the uplink signal.
  • the position measuring device considered in the present invention secures an approximate time synchronization for the mobile communication system based on the downlink signal transmitted from the mobile communication system.
  • the position measuring device of the present invention acquires signal synchronization so that the reception SNR of the uplink signal is maximized by setting a constant time window for the uplink signal synchronization.
  • the time window setting depends on where the base station is located, where the position finder of the present invention is located in one cell in one cell, and in what range of the terminal the position finder of the present invention wants to detect an uplink signal.
  • the time window is set differently.
  • the time window may be set according to a service radius of a cell to which another method belongs.
  • the time window may be set differently according to an expected position or a range in which the target terminal is assumed to exist.
  • the position measuring device is an uplink signal receiving unit for receiving an uplink signal from one or more target terminals to determine location or presence, and the position of the position measuring device itself,
  • the target according to one or more of one or more of a location of a base station, a cell radius of the base station, a distance from the base station, a range of a location where a target terminal is predicted to exist, and a signal detection range for detecting an uplink signal from the target terminal.
  • It provides a position measuring device including a control unit (variable to set the uplink search time window of the uplink signal received from the terminal).
  • the step of receiving an uplink signal from one or more target terminals to determine the presence or absence of the position measurement, and the position of the position of its own position, the position of the base station, the cell of the base station The uplink signal received from the target terminal according to one or more of a radius, a distance from the base station, a range of a position where a target terminal is predicted to exist, and a signal detection range for detecting an uplink signal from the target terminal It provides a method for measuring the position of the position measuring device comprising the step of variablely setting the uplink search time window.
  • the time synchronization window setting method for uplink signal detection of the target terminal of the present invention When the time synchronization window setting method for uplink signal detection of the target terminal of the present invention is used, performance of uplink time synchronization of the terminal to be detected can be improved. In addition, it is possible to implement an uplink receiver without significantly increasing the complexity of the position measuring device considered in the present invention.
  • FIG. 1 is a view of the position measuring device of the target terminal considered in the present invention.
  • FIG. 2 is a view showing the concept of position measurement of the present invention.
  • FIG. 3 is a conceptual diagram of a position measuring device for position measurement according to an embodiment of the present invention.
  • FIG. 4 is a conceptual diagram of a position measuring device for position measurement according to another embodiment of the present invention.
  • 5 shows downlink and uplink times in a conventional LTE system.
  • FIG. 6 shows a schematic operation of a position measuring device according to another embodiment of the present invention.
  • FIG. 7 illustrates an operation in which a position measuring device detects an uplink signal according to another embodiment of the present invention.
  • FIG 8 shows a time point of receiving an uplink signal of a target terminal when the position measuring device of the present invention is used in an LTE system.
  • FIG. 10 is an example of setting a time window for uplink signal detection when a position measuring device according to another embodiment of the present invention is applied to a W-CDMA system.
  • FIG. 11 illustrates an operation of a method of sharing information on a downlink reception time point for acquiring time information for uplink proposed in the present invention.
  • FIG. 12 illustrates an embodiment of a method of obtaining information on a downlink time point of a serving cell for detecting an uplink signal of a target terminal proposed in the present invention.
  • FIG 13 shows an embodiment of the implementation of the position measuring device proposed in the present invention.
  • FIG. 14 is an embodiment of a base station of a mobile communication network according to an embodiment of the present invention.
  • 15 is an embodiment of a location measurement server according to an embodiment of the present invention.
  • 16 is a flowchart of a position measuring method of a position measuring device according to another embodiment of the present disclosure.
  • 17 is an example of measuring a neighbor cell signal of a position meter according to an embodiment of the present invention.
  • 18 is an embodiment of an offset message of a frame boundary for an adjacent cell transmitted by a location measurement server in the present invention.
  • 19 is an embodiment in which the position measuring device of the present invention acquires a frame boundary of a serving cell from a signal of an adjacent cell.
  • a wireless communication system means a system for providing various communication services such as voice and packet data.
  • the wireless communication system includes a user equipment (UE) and a base station (BS).
  • UE user equipment
  • BS base station
  • the user terminal is a comprehensive concept that refers to a terminal in wireless communication, user equipment (UE) in WCDMA, LTE, HSPA and IMT-2020 (5G or New Radio), as well as MS (Mobile Station) in GSM, UT It should be interpreted as a concept including (User Terminal), SS (Subscriber Station), and wireless device. However, this specification was prepared based on the LTE system.
  • Base station or cell generally refers to a station (station) to communicate with the user terminal, Node-B (Node-B), eNB (evolved Node-B), gNB (gNode-B), LPN (Low Power Node) ), Sector, Site, Antennas of various types, Base Transceiver System (BTS), Access Point, Point (e.g., transmit point, receive point, transmit / receive point), relay node ( Relay Node), mega cell, macro cell, micro cell, pico cell, femto cell, remote radio head (RRH), radio unit (RU), and small cell (small cell).
  • Node-B Node-B
  • eNB evolved Node-B
  • gNB gNode-B
  • LPN Low Power Node
  • Sector Site
  • Antennas of various types Base Transceiver System (BTS), Access Point, Point (e.g., transmit point, receive point, transmit / receive point), relay node ( Relay Node), mega cell
  • the base station can be interpreted in two ways. 1) a device that provides a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell in relation to the wireless area, or 2) the wireless area itself. In 1), all devices that provide a predetermined wireless area are controlled by the same entity or interact to configure the wireless area in a collaborative manner. Points, transmission / reception points, transmission points, reception points, and the like, according to a configuration method of a wireless area, are examples of a base station. In 2), the radio area itself, which receives or transmits a signal from the viewpoint of the user terminal or the neighboring base station, may indicate to the base station.
  • a cell is a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission / reception point, or a transmission / reception point itself. You can.
  • the user terminal and the base station are two (Uplink or Downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are used in a comprehensive sense and are not limited by terms or words specifically referred to. Does not.
  • the uplink (Uplink, UL, or uplink) means a method of transmitting and receiving data to the base station by the user terminal
  • the downlink (Downlink, DL, or downlink) transmits and receives data to the user terminal by the base station Means the way.
  • TDD time division duplex
  • FDD frequency division duplex
  • an uplink and a downlink are configured based on one carrier or a pair of carriers to configure a standard.
  • Uplink and downlink transmit control information through control channels such as PDCCH (Physical Downlink Control CHannel), PUCCH (Physical Uplink Control CHannel), and PDSCH (Physical Downlink Shared CHannel), PUSCH (Physical Uplink Shared CHannel), etc. It consists of the same data channel and transmits data.
  • PDCCH Physical Downlink Control CHannel
  • PUCCH Physical Uplink Control CHannel
  • PDSCH Physical Downlink Shared CHannel
  • PUSCH Physical Uplink Shared CHannel
  • Downlink may mean a communication or communication path from a multiple transmit and receive point to a terminal
  • uplink may mean a communication or communication path from a terminal to a multiple transmit and receive point.
  • the transmitter may be a part of multiple transmission / reception points
  • the receiver may be a part of the terminal.
  • the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.
  • the 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.
  • the control channel can be transmitted.
  • the transmission and reception of signals through each channel will be described as a form in which the corresponding channel is transmitted and received.
  • the base station can transmit resource allocation information to the terminal through the PDCCH, and the base station can also transmit a control signal for resource allocation and signal transmission to the terminal through the PDSCH.
  • Time Division Multiple Access TDMA
  • Frequency Division Multiple Access FDMA
  • Code Division Multiple Access CDMA
  • Orthogonal Frequency Division Multiple Access OFDMA
  • NOMA Non-Orthogonal Multiple Access
  • OFDM-TDMA OFDM-FDMA
  • SCMA Separatse Code Multiple Access
  • LDS Low Density Spreading
  • One embodiment of the present invention is to allocate resources such as asynchronous wireless communication evolving to LTE / LTE-Advanced, IMT-2020 via GSM, WCDMA, HSPA, and synchronous wireless communication fields evolving to CDMA, CDMA-2000 and UMB. Can be applied.
  • a Machine Type Communication (MTC) terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement.
  • the MTC terminal may mean a terminal defined as a specific category for supporting low cost (or low complexity) and / or coverage enhancement.
  • the NB-IoT (NarrowBand Internet of Things) terminal means a terminal supporting wireless access for cellular IoT.
  • the objectives of the NB-IoT technology include improved indoor coverage, support for large-scale low-speed terminals, low sensitivity, ultra-low-cost terminal costs, low power consumption, and optimized network architecture.
  • NR New Radio
  • eMBB enhanced Mobile BroadBand
  • mMTC Massive Machine Type Communication
  • URLLC Ultra Reliable and Low Latency Communication
  • frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals, various messages related to NR (New Radio) can be interpreted as meaning used in the past or present or various meanings used in the future.
  • the main purpose of the information collecting device considered in the present invention is to measure a signal transmitted by a target terminal and use it to measure the position of the target terminal based on the signal. Therefore, it can be expressed in terms of a position measuring device and a signal measuring device, and they can be interpreted by the same or similar devices.
  • This embodiment describes a method and apparatus for obtaining a time synchronization for an uplink signal of a target terminal by a position measuring device for acquiring information on a specific terminal in a wireless communication system, particularly a mobile communication system.
  • the device described in this embodiment configures an appropriate uplink signal detection time window based on information such as a position in a cell of a mobile communication system and a cell configuration, and detects a signal of a target terminal based on the window. do.
  • a related field of the present embodiments is a technology for grasping presence or absence of terminals and obtaining location information based on an uplink signal transmitted by a terminal in a wireless communication system.
  • Applicable products and methods of the present embodiments are traffic information and public services through a wireless communication system, as well as accurate location information services of a terminal using a mobile communication system.
  • this specification uses various terms such as a searchable distance or a searchable range for a signal detection range for detecting an uplink signal from a target terminal, but should be interpreted in the same sense.
  • this specification uses various terms such as a cell service radius, a cell radius, and a base station radius for the cell radius of the base station, but should be interpreted in the same sense.
  • a GPS receiver is used as a method of acquiring information on the location and time of a receiver by receiving an external signal.
  • the GPS receiver should be interpreted in a broad sense including SBAS, Galileo, etc., which are other types of receivers used for the same purpose.
  • FIG. 1 The configuration of the mobile communication system is shown in FIG. 1.
  • An information collecting device for an adjacent terminal as shown in FIG. 1 was proposed in the invention of Korean Patent Registration No. 1992486 (Invention name: Method and apparatus for obtaining location information of terminal through wireless communication system).
  • a case in which uplink resource allocation information is acquired through a downlink receiver is illustrated.
  • the information collecting device considered in the present invention may include a downlink signal receiver 110, an uplink signal receiver 120 and an antenna 140. Therefore, unlike the mobile communication terminal or the base station, the adjacent terminal information collecting device considered in the present invention can receive both uplink and downlink signals.
  • both downlink and uplink signals are received through one antenna. And this information collecting device can be controlled to interlock the uplink signal receiver 120 and the downlink signal receiver 110 through the controller 130.
  • the uplink antenna and the downlink antenna may be used separately, and a plurality of uplink antennas and uplink receivers may be used.
  • the signal measuring device of the structure of FIG. 1 acquires the uplink resource allocation information allocated to the terminal, and measures the uplink signal based on this to obtain whether the terminal exists nearby and its location information.
  • the signal measuring apparatus of the present invention may receive control information transmitted in the downlink of the mobile communication system through the downlink signal receiver 110 to obtain the uplink resource allocation information.
  • application number 10-2018-0046139 “Position measuring method and device for mobile communication terminal”
  • Application No. 10-2018-0048825 “Method for setting uplink signal for location measurement of mobile communication terminal ”
  • Application No. 10-2018-0101066“ Method and apparatus for location measurement of terminal in mobile communication system ” Application No. 10-2019-0045762“ Position measurement system of mobile terminal ”can be referred to.
  • These contents may form part of the present specification.
  • Fig. 2 shows the operation of the position measuring device proposed in the present invention.
  • the base station 250 and the target terminal 210 exchange signals with each other.
  • One or more position measuring devices 220, 230, and 240 are disposed adjacent to the target terminal 210 for measuring the position.
  • the position measuring devices 220, 230, and 240 receive a signal transmitted by the target terminal 210, measure information such as signal strength, arrival time delay, and reception direction of the received signal and based on this, the target terminal ( 210).
  • the method of calculating the position sends information measured by one or more position measuring devices to the position measuring server, and the position measuring server calculates the position of the target terminal.
  • the calculated position information of the target terminal can be sent to each position measuring device.
  • Another method is to share information between location meters and measure information, and measure the location of a target terminal in one or more location meters. If the position of the target terminal is calculated by one position measuring device, the above information can be transmitted to another position measuring device to be shared.
  • the base station 250 forms a link with the target terminal 210 to perform communication, and the base station 250 allows the target terminal 210 to transmit an uplink signal and targets uplink resource allocation information therefor. It transmits to the terminal 210.
  • the above-described position measuring device is a device similar to the information collecting device of FIG. 1, and it is revealed that those described as an information collecting device in the present specification can be applied to the position measuring device of FIG. 2.
  • the position meter shown in FIG. 2 can be used for various purposes to estimate the position of the target terminal 210.
  • the position measuring device measures the signal transmitted by the target terminal 210 and acquires information such as the presence or absence of the target terminal 210, location information, and distance from the device of the present invention based on this. In this process, the position measuring device may measure information such as the size and time delay of the signal of the target terminal 210.
  • the position measuring device When the position measuring device according to the present embodiment measures the uplink signal, information on when the uplink signal of the target terminal 210 is transmitted is very important. If, even if the location finder according to the present embodiment acquires uplink resource allocation information, it is not known when this signal is received, in order to detect and measure it, complexity increases significantly or performance deteriorates. In order to know when the uplink signal is transmitted, it is very important to acquire the time synchronization including the frame boundary of the uplink transmitted by the target terminal 210 according to the present embodiment. In the present invention, an efficient method for acquiring a time synchronization including a frame boundary of an uplink signal transmitted by the target terminal 210 is provided by the position measuring device or the signal measuring device.
  • a method for acquiring a time synchronization including a frame boundary for an uplink signal transmitted by a target terminal by a position measuring device or a signal collector of the present invention.
  • one frame is composed of 10ms.
  • the system frame number (SFN) is a number from 0 to 1023 as the number of each frame.
  • the position measuring device receives a downlink signal transmitted by a serving cell communicating with a target terminal, and adds an offset of a predetermined value of a frame boundary area of the downlink signal to set the frame boundary of the uplink signal.
  • the offset of the constant value can be set to a positive value, a negative value, and 0.
  • the SFN value of the downlink signal of the serving cell communicating with the target terminal is set accordingly.
  • the position measuring device of the present invention sets a detection window for the uplink signal of the target terminal.
  • the detection window adds an offset of a constant value at a downlink reception time point of the serving cell, determines a time window size therein, and performs signal detection for the time window.
  • FIG. 7 is a view showing the configuration of a position meter according to an embodiment of the present disclosure.
  • FIG. 3 shows an embodiment of the structure of a position meter for implementing the present invention. (As described above, the position measuring device and the signal collector in this specification are conceptually the same device.
  • the position measuring device of the present invention includes at least one downlink signal receiver 310 and at least one uplink signal receiver 320 to receive a mobile communication signal.
  • the position measuring device includes a control unit 330 for controlling the received signal.
  • the position measuring device is a communication unit 340 capable of communicating with a base station or a location measuring server or another position measuring device, a GPS receiving unit 370 performing synchronization with absolute time, and an input unit 350 receiving input from a user.
  • a display unit 360 displaying information processed by the control unit 330.
  • the downlink signal receiver 710 and the uplink signal receiver 720 may be LTE downlink receivers and LTE uplink signal receivers.
  • the present invention has been described based on the LTE system, it is revealed that it can be easily applied to other wireless communication systems. That is, if the communication system in which the call of the target terminal is set is GSM or W--CDMA, the downlink receiver 710 and the uplink receiver 720 are implemented as receivers of the GSM or W-CDMA system, respectively.
  • the LTE downlink receiver captures an initial LTE downlink receiver, acquires system time synchronization, and acquires base station ID and system information. Further, the downlink receiver may receive control information transmitted to a target terminal that is a base station.
  • the LTE uplink receiver performs a role of detecting a transmission signal of the target terminal based on the information of the uplink transmission resource allocated to the target terminal, and calculating the arrival time and signal power of the target terminal.
  • uplink resource allocation information for a target terminal may be received through a downlink receiver
  • the information may be directly transmitted from a mobile communication system.
  • it may be received via a location measurement server.
  • it is possible to establish a communication link with a target terminal by using a mobile communication system and a predetermined resource (time, frequency, code, etc.) and transmission parameters during a location measurement period.
  • the position measuring device of FIG. 3 can secure an absolute time reference to calculate a difference between a time point at which each position measuring device receives an uplink signal of a target terminal.
  • the position meters secure the temporal synchronization based on the GPS signal so that they can play this role.
  • the present invention may use other methods to secure mutual time synchronization between different types of position measuring devices or to distinguish a difference in time (time delay) at which an uplink radio signal arrives. For example, it is applicable if a high-precision clock is used and it is possible to use the synchronization of the position measurement period in advance or to calculate a relative difference.
  • measurement of time may be performed based on a time difference between a time when a specific signal of an LTE downlink receiver is received and a time when an uplink signal of another user is received. The reception time or time delay information is transmitted to the location measurement server.
  • the GPS of FIG. 3 can be used to measure the position of the position meter of the present invention.
  • information about absolute time can be obtained through GPS, and multiple location meters can share time information using the information.
  • a separate communication unit 340 may be used when direct communication with a location measurement server or a base station or direct communication with another location measurement device is required.
  • the implementation of the position measuring device of FIG. 3 includes a display unit 360 to display the position of the target terminal to the user.
  • an input unit 350 for a user's input is provided. Through the input unit 340, the user inputs additional information such as manually inputting the information of the position of the current position measuring device to increase the accuracy of the position measurement. You can.
  • information related to the target terminal and the location measurement may be input through the input unit 340, and commands related to call setup and operation of the location measurement server may be input to the target terminal.
  • the control unit 330 connects to each device to control information reception, measurement, communication, input / output, and the like described herein.
  • the position measuring device 400 of FIG. 4 includes a downlink signal receiving unit 410, an uplink signal receiving unit 420, a control unit 430, and a GPS receiving unit 440, communication function with other equipment, display function, input
  • the function is implemented by connecting to a terminal 450 such as a commercial tablet or smartphone.
  • a terminal 450 such as a commercial tablet or smartphone.
  • connection between the control unit 430 and the terminal 450 of FIG. 4 may be connected using a wire such as USB, but a wired connection such as WIFI may also be used.
  • a wired connection such as WIFI may also be used.
  • both a wired connection and a wireless connection may be provided and selected and used according to circumstances.
  • a simple input / output device for power ON / OFF, function setting, etc. can be added to the position measuring device in a dotted rectangle in the position measuring device of FIG. 8. It is also possible to implement the GPS in the dotted line box using the GPS in the smartphone or tablet. In that case, the GPS in the dashed box can be omitted.
  • the devices of FIGS. 1, 3, and 4 commonly receive a downlink of a mobile communication system to secure time synchronization of the downlink. Then, the resource allocation information of the target terminal is secured, and the resource allocation information of the uplink is obtained based on this.
  • the above process can be secured by receiving the downlink signal of the mobile communication system, and may be performed by receiving resource allocation information from the mobile communication system. Then, based on the uplink resource allocation information, an uplink signal is detected to determine whether a target terminal exists.
  • the time synchronization for the uplink is incorrect. That is, although the signal transmitted by the terminal is transmitted in time synchronization at the base station, a considerable amount of time synchronization may occur in the position measuring device considered in the present invention. Therefore, there is a need for a method for securing accurate time synchronization for an uplink signal transmitted by a terminal.
  • FIG. 5 is a diagram for explaining a time synchronization error occurring in the position measuring device of the present invention when the terminal in the existing LTE mobile communication system matches uplink time synchronization.
  • the LTE base station is generally operated with the same downlink transmission time and uplink reception time. Therefore, LTE terminals transmit an uplink in a fairly large amount of time ahead of time, and the transmission time may vary greatly depending on the location of the terminal in a cell. In addition, the time at which the base station receives the uplink signal varies greatly.
  • the terminal In the LTE system, the terminal initially attempts to access the mobile communication base station through random access. In this case, different time delays occur depending on the distance of the terminal from the base station. That is, the time at which the base station receives the uplink signal may be different for each terminal. In order to overcome the difference in time delay according to the distance from the base station, the base station transmits a time correction command for the uplink signal to terminals to receive the uplink signal at one time. In general, the base station is set so that the downlink signal transmission time and the uplink signal reception time are the same.
  • the specification of the present invention has been mainly described in the case where the transmission time of the downlink signal of the base station and the reception time of the uplink signal are set to be the same.
  • the offset of the two viewpoints can be given, and in such a case, the position measuring device of the present invention can obtain the offset information and correct the uplink reception time of the target terminal by the value.
  • the above-described offset can be obtained in various ways.
  • the value may be received from a base station.
  • the mobile communication network may transmit the above values to the location measuring server of the present invention, and the location measuring server may transmit it to the location measuring server.
  • the time correction command received after the terminal is randomly accessed may be analyzed to estimate the value of the offset.
  • the signal transmitted from the mobile communication base station arrives at the terminal with a time delay of ⁇ T1. Therefore, if the terminal transmits an uplink signal at this time, it arrives at the base station with a time delay of 2 ⁇ T1. Therefore, the base station instructs the terminal to transmit the uplink signal at a time earlier by 2 ⁇ T1. Therefore, depending on where the terminal is located in one cell, a time point at which the terminal transmits a signal is different. Based on the base station, terminals transmit signals at - ⁇ T1.
  • a time point for transmitting an uplink is different depending on where it is located in one cell.
  • all the uplink signals are set to arrive at almost the same time point, but since the position measuring device of the present invention is located at a different location from the base station, uplink signal synchronization is very important.
  • the information collecting device of the present invention can receive a forward signal, that is, a downlink signal and determine which control information is transmitted from the base station to the terminal.
  • the communication device receives control information associated with a Radio Network Temporary Identifier (RNTI) through a downlink signal receiver and transmits an uplink signal to a base station based on whether the uplink signal is transmitted, that is, the terminal subsequently uses the aforementioned control information. Can be determined.
  • RNTI Radio Network Temporary Identifier
  • RNTI is used as a temporary ID of a terminal in a base station, and it is possible to maintain anonymity because it is not known which RNTI is assigned to a terminal.
  • RNTI has been described based on a method for identifying a terminal, but the present invention reveals that an ID temporarily assigned to a terminal within a base station or cell can be used with the same function.
  • the location finder of the present invention receives a downlink signal of a serving cell to obtain a location for arbitrary terminals, obtains RNTI information and uplink resource allocation information based on this RNTI, and the terminal of the RNTI is a location measurer. Whether it is in the vicinity or not and acquires its location information.
  • the RNTI is used as the identification information of the terminal, there is an advantage that a terminal capable of measuring location information at a specific point in time can be specified without leaking personal information (e.g. phone number / name / resident registration number) of the terminal user.
  • the location finder of the present invention can measure only location information of a terminal identified by a specific RNTI or phone number, instead of measuring location information for any terminal.
  • a base station or a mobile communication system forms a communication link with a target terminal so that the target terminal transmits an uplink signal.
  • the information collecting device of the present invention detects and measures the uplink signal. Based on this, information such as the presence or absence of a target terminal, time delay, and signal size is acquired in the vicinity of a specific position measuring device.
  • the position measuring device of the present invention can receive the RNTI and resource allocation information transmitted to the target terminal through the downlink control channel, and measure the presence or absence and signal of the target terminal uplink signal based on this.
  • the mobile communication system transmits the information of the RNTI value, uplink frequency, resource, and transmission parameters allocated to the target terminal to the position measurer of the present invention, and based on this, the position finder of the present invention is targeted.
  • the presence or absence of the uplink signal of the terminal, the time delay, the received power, etc. can be measured, and the position of the target terminal can be measured based on these measured values.
  • the position of the target terminal may be measured using information of one or more position measuring devices.
  • the mobile communication system may directly transmit the information related to the uplink transmission of the target terminal to the position measuring device of the present invention, it may transmit it to the position measuring server and the position measuring server may inform the position measuring device of the present invention.
  • an RNTI or resource allocation may be used in advance with the base station.
  • the position measuring device of the present invention acquires information such as a transmission time of a UL signal transmitted by a target terminal, a transmission channel, an MCS used for transmission, and a scrambling code, and based on this, the uplink of the target terminal is obtained. Signals can be detected and measured.
  • At least one location measuring device transmits measurement information such as time delay and reception power of an uplink signal transmitted by the target terminal and transmits the measured information to the location measuring server so that the location measuring server can measure the location of the target terminal.
  • the position measurement period of the present invention can communicate with each other to exchange measurement information and share it, and calculate the position of the target terminal in the position finder.
  • one position measuring device can measure the signal of the target terminal at different positions and transmit it to the location measuring server to calculate the position of the target terminal. As another method, it is possible for one position measuring device to measure the signal of the target terminal at different positions and to perform position calculation.
  • the information collecting device considered in the present invention or a device connected thereto can be configured in various ways.
  • First, one of the possible configurations is the configuration of FIG. 3.
  • Another configuration embodiment is illustrated in FIG. 4.
  • the functions of communication, display, input device, etc. with other external equipment are connected to an external smartphone or tablet to reduce the number of parts of the position measuring device of the present invention. Is implemented.
  • the inside of the dotted box is an embodiment of the information collecting device and can be used by connecting it to a commercial tablet or smartphone.
  • FIGS. 3 and 4 collect uplink resource allocation information of the target terminal, and detect and measure the uplink signal of the target terminal based on this. In addition, as well as detecting and measuring the uplink signal of the target terminal, it is possible to communicate to share the information with a server or other equipment.
  • the position measuring device of the present invention may operate at a fixed position, but a person or a mobile body to measure the position of the target terminal may carry and move it to measure the signal of the target terminal.
  • the position measuring device can be expressed by a position measuring device or a signal collector. It is noted that the present invention can be applied to any type of receiver to detect the presence or location of a target terminal based on this by detecting and measuring a signal transmitted by the target terminal.
  • the position measuring device should detect the uplink signal transmitted by the target terminal.
  • 5 illustrates a relationship between a terminal transmitting and receiving when a base station sets a downlink signal transmission time and an uplink signal reception time together.
  • the base station sets the same time to transmit the downlink signal and the time to receive the uplink as described above will be mainly described. However, even when the two viewpoints are different, the concept of the present invention can be easily modified and applied.
  • the method of the present invention it is possible to reduce the complexity of the position measuring device for receiving and measuring the uplink of the target terminal, as well as to improve the uplink reception performance transmitted by the target terminal.
  • FIG. 6 shows a schematic operation of a position measuring device according to another embodiment of the present invention.
  • the LTE system operates based on a 1 ms TTI, and downlink control information may be transmitted from a base station to a terminal every TTI. Meanwhile, the same procedure as below may be performed in a mobile communication system other than the LTE system.
  • the communication device may receive control information transmitted from the base station to the terminal (S610).
  • the UE can demodulate and decode the downlink signal every TTI.
  • the downlink signal received by the terminal from the base station may be a control channel (PDCCH) or a data channel (PDSCH). That is, in LTE, control information is generally transmitted through the PDCCH, but when the control information is transmitted through the PDSCH, the PDSCH may be received.
  • the position measuring device of the present invention may first receive the downlink PDCCH, and then attempt to receive the PDSCH where the control information is received.
  • the position measuring device may receive a forward signal, that is, a downlink signal, transmitted from the base station to the terminal, and then, when and through which resource, the uplink is transmitted, and determine the RNTI of the terminal at that time.
  • a forward signal that is, a downlink signal
  • the position measuring device of the present invention can receive control information of the target terminal corresponding to the RNTI when the base station gives the information of the RNTI, thereby obtaining uplink resource allocation information.
  • the mobile communication system may transmit the resource allocation information of the target terminal and the parameters necessary for the uplink reception of the target terminal to the position measuring device of the present invention.
  • the position measuring device of the present invention can acquire uplink resource allocation information of the target terminal.
  • the information related to the uplink of the target terminal can be directly transmitted to the location measuring device by the mobile communication system, but it is also possible to transmit it through the location measuring server.
  • each uplink signal receiver determines whether or not uplink signal transmission exists for each uplink signal receiver (S620). This process may include determining whether there is a terminal transmitting an uplink through control information transmitted through the downlink and what the RNTI of the terminal is. That is, when each uplink signal receiver determines that there is uplink signal transmission, it collects an uplink signal transmitted to the base station through the uplink resource, and transmits the uplink signal based on the collected uplink signal. Can be judged. In another method, the base station instructs the uplink transmission to the target terminal with the pre-promised resource allocation, and can transmit the information on the promised resource allocation to the location meter of the present invention in advance.
  • one or more uplink signal receivers included in the communication device may attempt to receive uplink signals by collecting uplink signals for each uplink signal receiver. Yes (S630).
  • the communication device may determine whether to transmit the uplink signal for each uplink signal receiver (S640).
  • the above-described operation may be continuously performed every TTI. Then, based on whether or not the uplink signal is transmitted through the signals collected by each uplink signal receiver, the communication device can grasp the presence, location, and mobility information of the terminal.
  • the above-described process may be performed based on the information of the RNTI of the terminal. That is, the communication device may determine only whether or not the uplink signal transmitted from the terminal having a specific RNTI is transmitted, and thus may determine the existence, location, and mobility information of the terminal having a specific RNTI.
  • FIG. 7 illustrates an operation in which a position measuring device detects an uplink signal according to another embodiment of the present invention.
  • a communication device may acquire uplink transmission information from a downlink received signal obtained through a downlink signal receiver. And the communication device may collect the uplink signal transmitted from the terminal to the base station through the resources allocated to the uplink based on the obtained uplink transmission information, and calculate the average received power of the collected signal (S710) ).
  • the communication device may compare the calculated average received power value with a pre-calculated or set threshold (S720). As a result of comparison, if the average received power value is greater than the threshold value (S720-Y), since an uplink signal has been received, it is determined that the terminal to measure the location exists nearby (S740), while the average received power value is critical If it is smaller than the value (S720-N), since an uplink signal has not been received, it may be determined that the terminal for measuring the location does not exist nearby (S730). If it is determined to exist near the terminal (S740), the uplink signal of the target terminal may be measured and used to calculate the location. In the above process, information on the reception strength and time delay of the uplink signal can be measured.
  • the power of the reference signal which is a pilot signal transmitted to the uplink PUCCH or PUSCH
  • power of a data signal transmitted on an uplink PUCCH or PUSCH can be used.
  • the presence and location information of the terminal can be grasped by combining the power values of the reference signal and the data signal.
  • the measurement can be performed using the SRS transmitted by the target terminal.
  • measurement may be performed using a RACH signal transmitted by a target terminal.
  • a mobile communication system controls an uplink transmission time through a time correction command so that uplink signals of terminals are received at the same time.
  • the position measuring device of the present invention since the position measuring device of the present invention is located at a different location from the base station, there is uncertainty about the time at which it is received. Therefore, in order to detect the uplink signal of the target terminal and maximize the SNR of the received uplink signal, it is essential to acquire time synchronization for the uplink signal of the target terminal.
  • the receiver performs a search for a time window of a certain time, and minimizing the time window is more advantageous in performance and implementation complexity.
  • the present invention proposes a method of optimizing and setting the time window.
  • the position measuring device of the present invention acquires its own position information. This can be achieved using the GPS on the locator. If the location does not receive the GPS signal, the user of the location meter may manually input the location. In addition, the position measuring device of the present invention acquires the position information of the base station of the serving cell in communication with the target terminal.
  • each position measuring device since a serving cell is a cell communicating based on a target terminal, each position measuring device may not only communicate with the serving cell, but may not receive the signal. Therefore, it is revealed that it is different from the concept of a serving cell defined in a conventional mobile communication system.
  • the search window may be set differently according to the position of the position measuring device of the present invention.
  • the search window may be set differently according to the location of the serving cell base station. From the above information, the distance between the serving cell base station and the position measuring device of the present invention is calculated. A search window is set based on the distance information.
  • Position measuring device of the present invention can be set in advance to the maximum distance to detect the target terminal. For example, it may be determined in advance whether to detect a target terminal within 1 km or a target terminal within a distance of 3 km. This value is called the search radius ds.
  • the search window according to the uplink signal of the target terminal is set differently according to the set value of the search radius to be detected.
  • the search radius may also be set by varying according to the estimated position of the position measuring device or the target terminal.
  • the search window may be set differently according to the service radius of the base station of the serving cell communicating with the target terminal.
  • the position measuring device may acquire radius information of the service cell and set a search window differently accordingly.
  • the position measuring device may acquire cell ID information of a serving cell and location information of a base station through which the target terminal communicates.
  • the location information of the base station is transmitted from the mobile communication network to the location measurement server, and the location measurement server can transmit the location information of the base station to the location meters. If the location finder does not accurately understand the location information of the base station (for example, a mobile base station), each location measurer measures information such as the arrival time of the downlink signal from the base station and the received power, This is transmitted to the location measurement server. The location measurement server calculates the location of the base station based on the measurement information, and informs the location meter of the location.
  • each position measuring device can share measurement information such as the arrival time of the downlink signal of the base station and the received power by the position measuring devices and calculate the position of the base station based on this.
  • the position of the base station calculated in this way can be displayed on the display of the location measurement server.
  • the location of the base station can be displayed on the display of a location meter or a mobile phone connected to it.
  • At least one location meter at the location of the base station analyzes the LTE downlink signal and receives the base station from the signal. It is possible to obtain the frame ID information of the cell ID and downlink signal of.
  • the obtained cell ID information can be transmitted to the location server to be shared with other location sensors. In another way, location meters can communicate with each other to share the necessary information.
  • 8 shows a time point of receiving an uplink signal of a target terminal when the position measuring device of the present invention is used in an LTE system.
  • 8 is a view showing a reception time at a position measuring device when a position measuring device is present in a direction in which a target terminal is centered around a base station. Therefore, when setting the detection window of the position measuring device of the present invention, the detection window may be set differently according to the approximate location information of the target terminal or information on the range. If the target terminal is located on the opposite side of the base station and the target terminal must be detected even in this case, it is necessary to set the detection window of the position measuring device larger than that described in FIG.
  • the distance between the base station and the position measuring device of the present invention is d1.
  • c is the speed of propagation, that is, the speed of light.
  • ds is the maximum distance from the target terminal to be detected by the position measuring device of the present invention. That is, it is an estimated value of the maximum distance between the position measuring device and the detectable target terminal.
  • the target terminal is present between the base station and the position measuring device of the present invention.
  • the time point when the uplink transmitted by the target terminal is received by the position measuring device is -2d1 / c + 2ds / c.
  • FIG. 8 shows a case where the position measuring device is present between the base station and the target terminal.
  • the time point when the uplink transmitted by the target terminal is received by the position measuring device is -2d1 / c.
  • the target terminal and the position measuring device are located at the same distance as the base station and the distance therebetween is ds, the time when the uplink transmitted by the target terminal is received by the position measuring device is -2d1 / c + ds / c.
  • the position meter in order to detect the signal of the target terminal, the position meter must search at least the window between [-2d1 / c, -2d1 / c + 2ds / c].
  • the search window should be set to include [0, 2ds / c] based on -2d1 / c. That is, the location window needs a search window [0, 2ds / c] having a size of 2 ds / c for the distance ds where the location finder can search for the target terminal. Adjust it by / c.
  • the window of [-2d1 / c -W1, -2d1 / c + 2ds / c + W2] is set.
  • W1 and W2 are zero or more values.
  • the center of the search window of the position measuring device is -2d1 / c, and thus, the center of the search window is moved according to the distance between the base station and the position measuring device.
  • the size of the search window is set differently according to the distance to be searched.
  • the signal of the target terminal may reach the position measuring device at a different time point from FIG. 8.
  • the target terminal is located on the opposite side of the base station, and the target terminal-base station-locator is located in a straight line, the target terminal transmits at -d2 / c time, which reaches the time point 0 at the base station.
  • d2 is the distance between the target terminal and the base station. This signal arrives at the d1 / c point of time on the opposite position meter.
  • the search window of the position measuring device is set to [-2d1 / c -W1, d1 / c + W2].
  • W1 and W2 are zero or more values.
  • the search window may be set to [-W1, d1 / c + W2]. In this way, depending on the position of the target terminal and the distance ds to be detected, the position measuring device may set a different search window.
  • the mobile communication system provides the location information of the base station to the location meter, and the location meter measures its own position and calculates the distance d1 between the base station and the location meter based on this.
  • the mobile communication system may directly inform the location meter of the location of the base station.
  • the mobile communication system may transmit the information to the location measuring server, and then the location information server may transmit the information to the location measuring device.
  • the location server can store the location of each base station and then deliver the information to the location meter.
  • the position measuring device measures the attenuation of the downlink signal and based on this, the distance between the base station and the position measuring device can be measured.
  • the position measuring device of the present invention includes GPS as shown in the embodiment of FIG. 3 or 4 or is connected to a terminal including GPS.
  • the position measuring device of the present invention calculates the value of d1 based on its own position measured from GPS and the position information of the base station.
  • the control device can calculate this value.
  • the control device may calculate the d1 value, but the connected smartphone or tablet calculates the value and transmits the value to the control device, so that the control device can set a search window.
  • the position measuring device of the present invention may be located in an area where GPS is not operated. If this situation occurs, the user can use the input device of FIGS. 3 and 4 to input the location of the location meter on the map or to input the location information in another way to grasp the location of the location meter.
  • Other methods include using PDRs, geomagnetic sensors, gyro sensors, and the like.
  • the method for calculating the searchable distance ds of the target terminal may require various parameters. For example, the transmission power of the target terminal, the radio wave environment of the cell, the position and reception performance of the position measuring device, and the like.
  • the searchable distance can be set in a variety of scenarios.
  • One example is to calculate the searchable distance from the base station of the mobile communication system and deliver it to the location meter.
  • the location measuring server may be informed and the location measuring server may inform the location measuring device.
  • the base station may calculate the searchable distance ds in consideration of the transmission power transmitted by the target terminal and the radio wave environment of the cell.
  • the base station receives a report such as a power headroom report from the target terminal and can use it for transmission power of the target terminal.
  • Another method is to calculate the searchable distance ds in the locator of the present invention. It calculates the searchable distance based on information such as the number of receiving antennas of the terminal, the type of antenna, and the environment and location of the surrounding radio waves of the position measuring device. In this process, it is assumed that the power transmitted by the target terminal is a constant value and the searchable distance can be roughly calculated.
  • the searchable distance may be set in advance in consideration of the reception performance of the position measuring device. For example, it can be set in consideration of the maximum distance that the position meter can detect.
  • a more efficient method than the above method is more efficient in receiving the transmission power information of the target terminal from the mobile communication system and utilizing it to calculate the searchable distance by combining it with information such as the reception performance of the location meter.
  • the transmission power information of the target terminal can be transmitted by the mobile communication system to the position measuring device, but the position measuring server can inform the position measuring server to inform the position measuring device.
  • Another method is to calculate the searchable distance from the location server and inform the location meter.
  • the location measurement server periodically receives the transmission power information of the target terminal from the mobile communication system.
  • information on the type of position measuring device and reception performance is secured.
  • the above information can be transmitted through the registration process of the position measuring device at the start of position measurement for the target terminal.
  • information such as the radio wave environment of the target terminal area and the size of the cell can be secured in advance. Based on the above information, the searchable distance of the target terminal is calculated, and the calculated result is notified to the position measuring device.
  • the mobile communication system provides the location of the base station and based on this, the position measuring device sets a search time period for searching the target terminal.
  • a method in which the mobile communication system informs the location of the base station is used.
  • the method may not operate normally.
  • the base station moves.
  • the position measuring device cannot measure its own position.
  • the mobile communication system informs the position measuring device of the service radius dR of the corresponding cell, and the position measuring device can set a search window based on this.
  • the mobile communication system informs the location server of the service radius of the cell, and the location server can inform the location meter.
  • the location measurement server may calculate a search window based on the information of the service radius of the cell and inform the location meter.
  • the present invention relates to setting a search window of a position measuring device for detecting a target terminal.
  • the setting of the search window can be changed according to the location of the base station, the position range of the target terminal, the position of the signal measuring device, the distance between the base station and the signal measurement period, the range to be detected, and the like.
  • the search window setting can be calculated by the location measuring server and notified to each location measuring device.
  • the location measurement server may transmit some or all of the information to the location meter, and set a search window based on this information and its own measurement information.
  • Fig. 9 shows setting a search window of the signal of the target terminal based on the service radius dR of the cell.
  • Fig. 9 shows the arrival time of the radio wave when the target terminal is located in the direction of the signal measuring device relative to the base station.
  • the reception time is the most advanced.
  • the reception time at this time is -2dR / c based on the reception time of the position measuring device.
  • the search window of the position meter should include [-2dR / c, 0].
  • the position meter sets the search window to [-2dR / c-W1, W2].
  • W1 and W2 are zero or more numbers.
  • the search window of the position measuring device needs to be set to [-2d R / c-W1, d R / c + W2]. If it is certain that the target terminal is on the other side of the base station, a search window may be set with [-W1, d R / c + W2]. This can be set differently depending on the position range of the target terminal and the range to be detected by the position meter.
  • the base station may set the transmission time of the uplink and the reception time of the uplink differently. If there is a difference between the two viewpoints, the base station can inform the location measurement server or the location meter, and correct it in the target terminal search window setting. If the base station sets the uplink reception time later than the downlink transmission time by ⁇ Toff, it can inform the location measurement server or the location meter to set a search window considering this. In this case, the search window of the position measuring device is moved on the time axis by ⁇ Toff as a whole. At this time, the direction of movement becomes the direction in which the number increases.
  • the position meter of the present invention can be installed in a fixed position.
  • the distance information between the base station and the terminal can be input to the storage device of the position measuring device of the present invention at the time of initial installation.
  • the search window can be calculated from the saved search window.
  • the service radius information of the base station may be input.
  • the search window can be stored in the storage device in advance.
  • the distance from the base station (or the service radius of the cell) may be stored for each frequency band. This is because cell radius and base station location may be different for each frequency band.
  • the search window information can be stored for each frequency.
  • a search window is set based on the information of the stored cell (location of the base station or the radius of the cell) or information of the search window. Thereafter, whenever the operating frequency of the position measuring device is changed, a search for a signal of the target terminal is performed based on the information of the stored cell or the search window. Alternatively, whenever the frequency is changed, the location measurement server can receive the information of the window and detect the uplink signal.
  • the radius of the serving cell may be set based on the approximate position of the serving cell. For example, it is possible to set differently depending on whether it is an urban area, a rural area, a mountainous area, or a coastal area. In this way, the degree of radius of the serving cell can be simply and stably acquired. That is, even if the service radius information of all cells is not stored, it is possible to set the approximate cell radius with only a large range of regional divisions, such as a city, a rural area, and a coast, and to set a window based on this.
  • the setting of the search window described above can be applied to the WCDMA system.
  • terminals are designed to transmit an uplink based on a point in time when the uplink is received. Therefore, it operates without matching the uplink reception time in the base station as in the LTE method.
  • the timing of receiving the position measuring device in this case is described in FIG.
  • FIG. 10 is an example of setting a time window for uplink signal detection when a position measuring device according to another embodiment of the present invention is applied to a W-CDMA system.
  • the search time of the target terminal can be set to [0, 2ds / c]. It can be seen that this is set regardless of the distance d1 between the base station and the position meter. In fact, it can be set to [-W1, 2ds / c + W2] when applied to the position meter.
  • W1 and W2 are zero or more numbers.
  • d2 is the distance between the target terminal and the base station.
  • the search window can be set to [-W1, 3dR / c + W2]. This is the case where the target terminal and the locator are located in the cell boundary area, and the target terminal-base station-locator is in line.
  • the location measurement server acquires the location information of the base station and the service radius of the cell and delivers the information to the location meter.
  • the search window may be calculated and notified to the locator.
  • the location measurement server can store and use the location information of the base station and the service radius of the cell in an internal database. That is, only the base station ID is received from the mobile communication network, and based on this, the location information of the base station or the service radius of the cell can be obtained or calculated from the stored data.
  • the above information can be transmitted from a mobile communication network.
  • Another possible method is to have both the location information of the base station and the service radius of the cell equipped with the location finder.
  • a search window is set based on the distance between the base station and the location measuring device.
  • the search window is set based on the cell service radius. In this way, the search window can be variably set according to the environment.
  • the present invention proposes a method of setting a search window of an uplink receiver of a position measuring device for detecting an uplink signal of a target terminal.
  • the search window of the uplink receiver is set based on the reception time of the downlink signal of the cell to which the target terminal belongs.
  • the location finder of the present invention may be located where the target terminal does not receive the downlink signal of the cell to which it belongs. In such a case, even if the position measuring device of the present invention is in a position capable of detecting the target terminal, it may not be possible to detect the downlink signal.
  • the present invention proposes a method for solving this.
  • each position measuring device reports a time difference between the time when the downlink signal of the serving cell is received (the downlink signal of the cell to which the target terminal belongs) and the reference time of the GPS to the position measuring server. Based on this, the location server calculates the time difference information between the downlink signal of the cell to which the target terminal belongs and the GPS reference time, and notifies each location meter of this value.
  • the signal measuring device of the present invention grasps the timing of the downlink signal of the cell to which the target terminal belongs, based on the time difference information, and sets a detection window of the uplink signal of the target terminal based on this information.
  • FIG. 11 illustrates an operation of a method of sharing information on a downlink reception time point for acquiring time information for uplink proposed in the present invention.
  • the mobile communication base station is set to transmit an uplink signal to the target terminal.
  • Several position measuring devices of the present invention are arranged around the target terminal to attempt to detect the uplink signal of the target terminal.
  • some position meters may properly receive the downlink signal of the base station of the cell to which the target terminal belongs, and some may not properly receive.
  • the failure to properly receive the above may include a case in which the signal of the base station is not detected, or even if it is detected, the signal cannot be trusted because the signal is not received with sufficient SNR.
  • the position measuring device 1 properly receives the downlink signal of the base station, and the position measuring device 2 and the position measuring device 3 do not.
  • the position measuring device 1 measures the information at the time when the downlink of the base station is received and informs the position measuring server.
  • the measurement may measure the difference between the time when the downlink signal of the base station is received and the time of GPS, and inform the location measurement server.
  • the position measuring device 1 transmits the reception time information of the downlink signal of the base station communicating with the target terminal to the position measuring server, and based on this, the position measuring server determines the transmission time or downlink signal of the downlink signal of the base station. Calculate the time of arrival at the locator and notify other locators.
  • the location measurement server may calculate the transmission time of the base station signal using Equation 1 below based on the downlink reception time of the location meter 1.
  • the propagation delay value between the base station and the location measurement period may be calculated using a value obtained by dividing the distance between the base station and the location measurement period so that light is deceived.
  • the location measurement server calculated the information of the serving base station's downlink transmission time, but the location measurement server transmits the location information of the base station to each location measuring device, and based on this, the downlink transmission time of the serving base station is determined. It is clear that each locator can calculate.
  • the position measurer measures a time point when a downlink signal of a serving base station is received or a time point of a downlink signal of a serving base station is transmitted based on GPS time, and transmits it to a location measurement server.
  • the location measurement server calculates a time point at which a downlink signal of a serving base station is transmitted or a time point at which the downlink signal is received based on information received from each location measurer and transmits this information to each location measurer.
  • the position measuring device receiving the information from the position measuring device does not detect the signal of the serving base station or detects it with low reliability
  • the position of the target terminal is increased based on the information on the downlink time point of the serving base station received from the position measuring server. Predict the time when the link signal is transmitted and set the detection window based on this to detect the uplink signal of the target terminal.
  • the location measurement server calculates the downlink transmission time of the serving base station or the downlink reception time at the location meter based on the information received from each location meter, and transmits it to each location meter.
  • the method for calculating the transmission time of the base station may calculate the downlink transmission time of the serving base station measured by each position measuring device based on the information transmitted from each position measuring device, and average it and set it as a representative value. As another method, it can be set as a representative value using the earliest or the slowest value of each downlink transmission time value. Alternatively, it can be set based on the measurement result of the position measuring device that has received the strongest signal. Alternatively, the position transmitter that has received a signal having an SNR of a certain threshold or higher may have the fastest transmission time.
  • the location measurement server calculates the downlink reception time of the serving cell based on the measurement value transmitted from each location measuring device, a similar method can be used to calculate the representative value and transmit it to each location measurement server.
  • the location measurement server calculates the transmission time of the serving cell base station and notifies each location measurer.
  • Each position measuring device can calculate a reception time of a downlink signal based on a distance value between the base station and the position measuring device, and based on this, a search window for detecting a target terminal signal can be set.
  • the location server can calculate the received point values for each location meter and notify them.
  • Each position measuring device sets a search window value based on the received point value.
  • the position measuring device acquires information on the downlink transmission time of the serving cell or the reception time at the position measuring device, and sets a search window for detecting the uplink signal of the target terminal based on this.
  • FIG. 12 illustrates an embodiment of a method of obtaining information on a downlink time point of a serving cell for detecting an uplink signal of a target terminal proposed in the present invention.
  • the position measuring device includes a GPS-based timer and an LTE downlink signal-based timer, respectively, to grasp the flow of time.
  • both timers simultaneously display a 10 ms boundary. It can be seen that there is a difference in the Toff value between the two timers.
  • the position measuring device can read the value of Toff, and grasp the difference between the LTE downlink reception time and the GPS-based timer based on this.
  • Fig. 13 shows an embodiment of the implementation of the position measuring device proposed in the present invention.
  • the position measuring device includes a GPS receiver and an LTE downlink receiver, respectively.
  • it has a reference timer for measuring the time received from the GPS receiver and a timer for measuring the time received from the LTE downlink receiver.
  • the timer can read and write the information of the timer.
  • the method for the position measuring device to acquire the Toff value for the serving cell of the target terminal can read the values of the two timers at the desired time point by the control device, and calculate the Toff value based on the difference value.
  • Another method is to know the value of another timer at the frame boundary point of one timer, and calculate the value of Toff based on this.
  • one of the two timers is selected, and a signal indicating the transmission time (or the reception time or transmission time of the downlink) of the uplink signal of the target terminal is generated based on the selected timer. Then, an uplink signal detection window of the target terminal is set based on this, and a signal of the target terminal is detected based on the window.
  • the position measuring device when the position measuring device stably receives the uplink signal of the serving cell of the target terminal, the timer based on the downlink signal is used to detect and measure the uplink signal of the target terminal.
  • the position measuring device does not detect the downlink signal (or downlink signal of the time-synchronized cell) of the serving cell of the target terminal, or if the reception performance is poor, the downlink time and GPS time of the serving cell It receives the information on the difference for and detects and measures the uplink signal of the target terminal based on a timer obtained from the GPS signal.
  • the position measuring device of the present invention may not be able to detect the downlink signal of the serving cell and may be in a position where the GPS signal is not captured. Even in this case, it is necessary to set up a search window while holding uplink time synchronization for the target terminal.
  • each position locator determines one reference cell through a downlink receiver.
  • the position measurer measures the frame boundary of the reference cell and the offset of the downlink signal of adjacent cells and transmits this information to the position measurement server.
  • the reference cell may be determined as a serving cell communicating with a target terminal. However, when the reception level of the signal of the serving cell is unstable below a specific value, the cell receiving the strongest downlink signal may be determined as the reference cell. Alternatively, a cell for which the downlink of the strongest signal is always received may be determined as a reference cell.
  • the position measuring device measures the ID of the reference cell, the ID of the adjacent cell and the offset information of the frame boundary, and can inform the position measuring server.
  • each location meter may share the information through direct communication.
  • Fig. 17 shows an example of a frame boundary of a downlink signal received from the position measuring device.
  • the position measurer selects a signal of a base station for receiving the strongest downlink signal as a reference cell.
  • the position measurer measures a boundary offset value of a frame of a signal received from an adjacent cell based on a boundary of a downlink frame of a reference cell.
  • the position measuring device transmits the ID and offset values of the neighboring base station along with the ID of the reference cell to the position measuring server. In another way, it is also possible to operate by sharing the information between the location meters.
  • the location server calculates the offset values between the serving cell and the adjacent cells based on the measurement of the offset value of the downlink signal of the location meters and informs the location meters. That is, the time offsets of all of the offsets that can be calculated are calculated by combining the offset values transmitted by the location meters, and the location meters are notified in the form of a message.
  • the serving cell is S1.
  • Position meter 1 can only receive signals from S1, N1, and N2.
  • Positioner 2 can only receive signals from N2 and N3.
  • Positioner 3 can only receive signals from N3 and N4.
  • S1, N1, N2, and N3 are all serving cell or cell IDs of adjacent cells.
  • the position measurement server calculates offset information with the downlink frame boundary of the serving cell of the adjacent cells based on the offset report of each position measurement device.
  • the offset value of N4 can be calculated only when all three position meters are reported.
  • the ID and offset values of the adjacent cells thus calculated are notified to each position measuring device.
  • the offsets can be calculated by considering only the measurement result of the position finder received within the time of the latest T_window. Since the relative time between base stations may change over time, it is possible to calculate by reflecting only recently measured results.
  • the time offset between each base station may be kept constant.
  • the location measurement server may obtain the information of the time offsets from the mobile communication network and inform the location measurement device.
  • FIG. 18 shows an embodiment of a message informing a position offset of each position meter in the position measurement server.
  • the position measurer transmits time offset values of neighbor cells capable of offset calculation and cell IDs of the neighbor cells in one message.
  • the time offset values are calculated based on the downlink signal of the serving cell.
  • each position measuring device can exchange the offset information through a communication channel, and calculate the offset of each neighboring base station.
  • the process by which the position measuring device measures and reports the offset values of adjacent cells, and the process by which the position measuring server calculates and transmits the offset information of the adjacent cells need not always operate. This is performed when at least one position measuring device does not receive the downlink signal of the serving cell.
  • the position measurement server may command the position measurement devices for offset measurement and transmission when one or more position measurement devices do not receive a signal from the serving cell.
  • the location measurement server may instruct the location meters to measure and transmit offsets when one or more location meters do not receive signals from the serving cell and GPS signals. The position measurement server receiving the measurement report of the offset calculates the offset of each adjacent cell and transmits the calculated offset information to each position measuring device.
  • the position measurement devices When the position measurement server issues an offset measurement command to the position measurement devices, the position measurement devices periodically report an offset measurement for adjacent cells, and the position measurement server notifies the position measurement devices of the offset values for the adjacent cells based on this. .
  • the frequency at which the position measuring device reports the offset may be set by the position measuring server. According to another embodiment, it may be set to report when the offset is changed over a certain value.
  • the position measuring devices may obtain offset information of each neighboring cell by receiving the offset message transmitted by the position measuring server.
  • the position measuring device having obtained the offset information does not receive the signal of the serving cell (or when the serving cell signal of reliable quality is not received)
  • the location signal of the highest quality downlink among the neighboring cells having obtained the offset information is transmitted.
  • the frame boundary information of the serving cell is obtained as a reference.
  • the highest quality may refer to a downlink of an adjacent cell received with the largest power. Alternatively, it may mean a downlink of an adjacent cell that is the highest SNR. 19 shows an embodiment of the operation in the position meter.
  • the position measuring device receives the downlink signal of the highest quality base station among the adjacent cells that have obtained the offset information and acquires the frame boundary. Based on this, a signal corresponding to the frame boundary of the downlink signal transmitted by the location measurement server may be generated, and based on this, an uplink signal detection window of the target terminal may be set.
  • the position measuring device selects one of the adjacent cells that secures the offset information and sets a detection window of the uplink signal of the target terminal based on the downlink frame boundary of the adjacent cell. do.
  • the target terminal receives a downlink of a neighboring cell having good downlink quality among neighboring cells obtained offset information and acquires a frame boundary.
  • the frame boundary of the serving cell can be obtained by adding an offset value to this frame boundary.
  • the value of the offset is represented by T off_N5 .
  • An uplink detection window of the target terminal may be set based on the frame boundary of the serving cell.
  • the position measuring device has been described with reference to FIGS. 3 and 4.
  • the position meter according to the above-described embodiments includes the following components.
  • the position measuring device receives the uplink signal from one or more target terminals to determine the presence or absence of the position measurement, the uplink signal receiving units 320 and 420, and the position of the position measuring device itself, The location of the base station, the range of the location where the target terminal is predicted to exist, the approximate location range of the target terminal, the cell radius of the base station, the distance from the base station, and a signal detection for detecting an uplink signal from the target terminal And control units 330 and 430 configured to variably set an uplink search time window of an uplink signal received from the target terminal according to one or more of the ranges.
  • the position measuring device may include a downlink signal receiving unit 310 or 410 receiving a downlink signal from a base station or a GPS receiver 340 or 440 receiving a GPS signal.
  • the control units 330 and 430 may acquire time information from the downlink signal or the GPS signal, and set an uplink search time window of the target terminal from the time information.
  • the position measuring device may confirm the position of the position measuring device itself based on one of the acquired position measuring device's own location information or the manually input position measuring device's own location information.
  • the location finder can confirm the location of the base station based on one of the location information of the base station received from the base station or the location information of the base station received from another location measurement server.
  • the location finder may check the cell radius of the base station based on one of cell radius information of the base station received from the base station or cell radius information of the base station received from another location measurement server.
  • the position measuring device confirms the position of the position measuring device itself based on one of the acquired position measuring device's own position information or the manually input position measuring device's own positioning information, and the location information of the base station received from the base station or Based on one of the location information of the base station received from another location measurement server, the location of the base station can be confirmed, and a distance between the base station and the location of the base station can be calculated.
  • the position measuring device may measure the attenuation of the downlink signal and calculate a distance from the base station based on the measured attenuation of the downlink signal.
  • the position measuring device the uplink signal from the target terminal based on one of the signal detection range information received from the base station or the signal detection range information received from another location measuring server, the position measuring device itself calculated signal detection range information It is possible to check the signal detection range detecting.
  • the position measuring device when the position measuring device itself calculates the signal detection range information, the transmission power transmitted by the target terminal and the radio wave environment of the cell of the base station, the head ROM report received from the target terminal, the target terminal
  • the signal detection range may be calculated in consideration of the number of antennas, the type of the antenna of the target terminal, and one or more of the position measuring device's own radio environment or location.
  • control unit 330, 340 of the position measuring device sets the uplink search time window of the uplink signal received from the target terminal based on the time when the downlink is received, or when the downlink is received. Regardless, an uplink search time window of an uplink signal received from the target terminal may be set.
  • the control units 330 and 340 receive the location meter itself from the base station.
  • the downlink reception time may be obtained based on the downlink reception time or based on the downlink reception time information received from another location measuring device or a location measurement server.
  • the control unit may acquire a time of the downlink reception by measuring a time difference between a GPS-based timer and a downlink-based timer. have.
  • the downlink reception time (or downlink transmission time of the base station) in consideration of the time difference information of the downlink reception time (or the transmission time of the base station) transmitted by the GPS-based timer and the location measurement server or another position measuring device can be obtained.
  • an uplink signal search time window of the target terminal is set based on the information.
  • the position measuring device may set an uplink detection window of the target terminal based on the downlink frame boundary of the adjacent cell.
  • the control unit obtains offset information of downlink signals of adjacent cells and serving cells.
  • the control unit sets a timer based on the downlink signal of the adjacent cell from which the offset information is obtained, and sets an uplink detection window for the target terminal based on this.
  • the position measurer measures the relative time offset of the frame boundary of the downlink signal transmitted by adjacent base stations and reports it to the position measurement server.
  • FIG. 14 shows a structure of a base station of a mobile communication network according to the present invention.
  • the base station 1400 includes a downlink signal transmitter 1410 and an uplink signal receiver 1420.
  • the downlink signal transmitter 1410 functions to transmit signals to terminals.
  • the uplink signal receiving unit 1420 functions to receive an uplink signal transmitted by terminals.
  • the base station 1400 of the mobile communication network includes a communication unit 1440 for transmitting RNTI information or channel setting and resource allocation information of the target terminal to the position measuring device.
  • the base station 1400 informs the position measuring device of the state of the target terminal.
  • cell ID information of the base station 1400 that has established a link with the target terminal and cell ID information of the base station maintaining an adjacent time synchronization may be transmitted.
  • the control unit 1430 uses the downlink signal transmitting unit 1410 and the uplink signal receiving unit 1420 of the base station to set the signal transmission to the target terminal.
  • the position measurement server 1500 of the present invention includes a communication unit 1510 and a control unit 1520.
  • the communication unit 1510 has a communication function with a mobile communication network and a communication function with a position measuring device.
  • the communication function with the mobile communication network receives identification information of the target terminal or uplink channel setting and resource allocation information. Then, the state information of the target terminal, the cell ID information of the base station forming a link with the target terminal, and the cell ID information of the base station maintaining an adjacent time synchronization are received.
  • the control unit 1520 controls a function of receiving identification information or resource allocation and channel setting information of the target terminal from the base station of the mobile communication network. Further, the state information of the target terminal, the cell ID of the base station that has established a link with the target terminal, and the cell ID information of another base station maintaining an adjacent time synchronization are received.
  • the position measurement server 1500 performs a function of transmitting information received from the mobile communication network to the position measurement device. In addition, it receives the uplink measurement result of the target terminal from one or more position measuring devices to calculate the position of the target terminal and transmits it to the position measuring device. In addition, the control unit 1520 controls a function of receiving a location measurement request for a target terminal from a location meter or other device and transmitting it to the mobile communication network.
  • the position measurement server 1500 receives the offset information between adjacent cells measured by each position measuring device, calculates the time offset between each neighboring cell and the serving cell based on this, generates a message including the information, and generates it. It is delivered to the position measuring device.
  • 16 is a flowchart of a position measuring method of a position measuring device according to another embodiment of the present disclosure.
  • the method for measuring a position of a position measuring device 1600 includes receiving a downlink signal from a base station (S1610), the position of the position measuring device itself, and the target terminal.
  • a base station S1610
  • One or two of the range of the position to be predicted, the approximate position range of the target terminal, the position of the base station, the cell radius of the base station, the distance from the base station, and the signal detection range for detecting an uplink signal from the target terminal Variablely setting the uplink search time window of the uplink signal received from the target terminal according to the above (S1230), and receiving the uplink signal from one or more target terminals to determine location or presence or absence.
  • the step of receiving a downlink signal from the above-described base station (S1610) does not correspond to an essential component in the position measuring method 1600 of the position measuring device according to another embodiment.
  • the position measuring method 1600 of the position measuring device may receive a downlink signal from a base station or a GPS signal.
  • time information can be obtained from the downlink signal or the GPS signal, and the uplink search time window of the target terminal can be set from the time information. have.
  • the position measuring method 1600 of the position measuring device may check the position of the position measuring device itself based on one of the acquired position measuring device's own position information or the manually entered position measuring device's own position information.
  • the position measuring method 1600 of the position measuring device may check the location of the base station based on one of the location information of the base station received from the base station or the location information of the base station received from another location measuring server.
  • the location information of the target terminal can be used by receiving the initial location range information of the target terminal received from the emergency rescue center or the mobile communication system from the location measurement server. In addition, it can be obtained based on the range of the target terminal calculated by the location measurement server based on the signal measurement of the target terminal.
  • the position measuring method 1600 of the position measuring device may check the cell radius of the base station based on one of cell radius information of the base station received from the base station or cell radius information of the base station received from another location measuring server. .
  • the position measuring method 1600 of the position measuring device confirms the position of the position measuring device itself based on one of the acquired position measuring device's own position information or the manually input position measuring device's own positioning information, and from the base station
  • the location of the base station is determined based on one of the received location information of the base station or the location information of the base station received from another location measurement server, and the identified location of the position meter and the distance from the base station to the base station Can be calculated.
  • the position measuring method 1600 of the position measuring device may measure the attenuation of the downlink signal and calculate the distance from the base station based on the measured attenuation of the downlink signal.
  • the position measuring method 1600 of the position measuring device is based on one of the signal detection range information received from the base station or the signal detection range information received from another location measuring server, or the signal detection range information calculated by the position measuring device itself. A signal detection range for detecting an uplink signal from the target terminal can be confirmed.
  • the position measuring method 1600 of the position measuring device when the position measuring device itself calculates the signal detection range information, the transmission power transmitted by the target terminal and the radio wave environment of the cell of the base station, received from the target terminal
  • the signal detection range may be calculated in consideration of one or more of the head rom report, the number of antennas of the target terminal, the type of the antenna of the target terminal, and the propagation environment or location of the position measuring device itself.
  • the position measuring method 1600 of the position measuring device based on the time when the downlink is received, sets the uplink search time window of the uplink signal received from the target terminal, or the time when the downlink is received. Regardless, an uplink search time window of an uplink signal received from the target terminal may be set.
  • the position measuring method 1600 of the position measuring device sets an uplink search time window of an uplink signal received from the target terminal based on a time point at which the downlink is received, the position measuring device itself receives from the base station.
  • the downlink reception time may be obtained based on one downlink reception time or based on the downlink reception time information received from another location measuring device or a location measurement server.
  • the control unit when the position measuring device is equipped with a GPS-based timer and a downlink-based timer, the control unit considers a time difference between a GPS-based timer and a downlink-based timer. By doing so, the downlink reception time can be calculated.
  • the position measuring device and the position measuring method according to the above-described embodiments can improve performance of uplink time synchronization of a terminal to be detected by using a time synchronization window setting method for uplink signal detection of a target terminal. .
  • the position measuring device and the position measuring method according to the above-described embodiments can implement an uplink receiver without significantly increasing the complexity of the considering position measuring device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un dispositif de mesure d'emplacement et son procédé de mesure d'emplacement, le dispositif de mesure d'emplacement recevant un signal de liaison montante provenant d'au moins un terminal cible qui est soumis à la mesure d'un emplacement ou à la détermination de son existence ou non, et définit de manière variable une fenêtre temporelle de recherche de liaison montante du signal de liaison montante reçu en provenance du terminal cible selon au moins un ou deux des éléments suivants : un emplacement du dispositif de mesure d'emplacement, un emplacement d'une station de base, un rayon de cellule de la station de base, une distance à partir de la station de base, une plage d'emplacement à laquelle on prévoit que le terminal cible existe, et une plage de détection de signal dans laquelle le signal de liaison montante est détecté à partir du terminal cible.
PCT/KR2019/013154 2018-10-08 2019-10-08 Dispositif de mesure d'emplacement destiné à mesurer l'emplacement d'un terminal cible dans un système de communication sans fil et son procédé de mesure d'emplacement WO2020076039A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/283,403 US11997559B2 (en) 2018-10-08 2019-10-08 Location measurement device for measuring location of target terminal in wireless communication system and location measurement method thereof
CN201980066543.4A CN112840711A (zh) 2018-10-08 2019-10-08 无线通信系统中用于目标终端的位置测量的位置测量设备及其位置测量方法
EP19871419.8A EP3866520A4 (fr) 2018-10-08 2019-10-08 Dispositif de mesure d'emplacement destiné à mesurer l'emplacement d'un terminal cible dans un système de communication sans fil et son procédé de mesure d'emplacement

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KR20180120038 2018-10-08
KR10-2018-0120038 2018-10-08
KR10-2019-0124204 2019-10-07
KR1020190124204A KR20200040676A (ko) 2018-10-08 2019-10-07 무선통신 시스템에서 타겟 단말기의 위치측정을 위한 위치측정기 및 그 위치측정방법

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