Link signal setting method for location measurement of mobile communication terminals

Abstract

This invention proposes an apparatus and method for estimating the location of a target terminal in a mobile communication system. Typically, a mobile communication system consists of a base station and terminals. In this invention, one or more location measuring devices are arranged around the target terminal where location measurement is required to measure the transmitted signals of the target terminal, and based on this, the location of the target terminal is accurately measured. In this process, the base station needs to connect a communication channel to the terminal to measure the terminal's location, and a method for this is proposed. In particular, this invention relates to a method for configuring a terminal in a standby state to transmit an uplink. Furthermore, operations and protocols for location measurement of a target terminal are proposed.

Description

[0001] This application is a divisional application based on Chinese patent application No. 201980028699.3 (International Application No. PCT / KR2019 / 005082), filed on April 26, 2019, entitled "Link Signal Setting Method for Location Measurement of Mobile Communication Terminal". Technical Field

[0002] This invention proposes an apparatus and method for estimating the location of a target terminal in a mobile communication system. Background Technology

[0003] Mobile communication systems consist of base stations and terminals. Traditional location estimation methods estimate location based on signals transmitted by the terminals. In this case, a common approach is to use the delay required for the signal transmitted by the terminal to reach the base station. Alternatively, the distance between the base station and the terminal can be estimated based on the propagation attenuation that occurs in the channel through which the signal transmitted by the terminal reaches the base station. Various conventional methods for communication between the base station and the terminal can be used as communication methods for this purpose.

[0004] In this invention, the terminal used for measuring location is called the target terminal. Korean Patent Application KR10-2019-0045762 discloses a method for accurately measuring the location of a target terminal. This invention includes a device for acquiring uplink resource allocation information transmitted in a wireless communication system and an uplink receiver. Based on this uplink resource allocation information, it checks whether a terminal transmitting a signal to the corresponding uplink resource is nearby, and obtains the terminal's location information based on information such as signal strength and time delay. In this invention, a base station of a mobile communication network establishes a link with the target terminal. Furthermore, the measurement information of the uplink channel of the target terminal, measured by the location measurement device, is sent to a location measurement server, and the location measurement server calculates the location of the target terminal.

[0005] To accurately measure the location of a target terminal, the target terminal needs to transmit uplink signals within a certain time period. Additionally, a base station or location measurement equipment measures the signals transmitted by the target terminal.

[0006] When a target terminal is in a call state, it continuously exchanges signals with the base station. Therefore, the base station can perform distance or location measurements based on the signals sent by the terminal. If the terminal needs to send a specific signal with more precise measurements, the base station can instruct the terminal to send that signal.

[0007] On the other hand, when the target terminal is in standby mode, most terminals do not send uplink signals or send uplink signals at a very low frequency. Therefore, it is difficult for base stations or location measurement equipment to measure distance or location based on the signals sent by the terminal.

[0008] In addition, in order for the location measurement device to accurately measure the signal of the target terminal, it is necessary to design the operation and protocol between the mobile communication network base station, the location measurement server and the location measurement device. Summary of the Invention

[0009] The technical problem to be solved by the present invention

[0010] In this invention, when measuring the position of a target terminal in standby mode, the target terminal can send an uplink signal for position measurement while minimizing or not altering its operation. The position measurement device can then measure distance, position, etc., based on the uplink signal sent by the target terminal.

[0011] In addition, it provides effective operation and protocols between base stations, location measurement servers and location measurement devices of mobile communication networks related to the location measurement of target terminals.

[0012] Technical solution

[0013] In one embodiment, a method is provided to measure the transmitted signals of a target terminal by arranging one or more location measuring devices around the target terminal, and to accurately measure the location of the target terminal based on this measurement. This invention also proposes interoperability and protocols between location measuring devices, location measuring servers, and base stations in a mobile communication network.

[0014] Beneficial effects

[0015] According to the present invention, when attempting to measure the position of a target terminal in standby mode, the target terminal can send an uplink signal for position measurement while minimizing or not changing the operation of the target terminal.

[0016] In addition, an effective operation method and protocol for the mobile communication network base station, location measurement server and location measurement equipment required for measuring the location of the target terminal are proposed. Attached Figure Description

[0017] Figure 1 This is a diagram illustrating traditional base station-based location measurement.

[0018] Figure 2 This is a diagram illustrating the concept of position measurement according to the present invention.

[0019] Figure 3This is a flowchart illustrating a link signal control method according to an embodiment of the present invention.

[0020] Figure 4 This is a diagram illustrating the signal flow between a location measurement device, a location measurement server, and a base station of a mobile communication network according to an embodiment of the present invention.

[0021] Figure 5 This is a diagram illustrating the state transitions of a position measuring device according to an embodiment of the present invention.

[0022] Figure 6 This is a diagram illustrating two sub-states of a target terminal in a state where the uplink signal of a location measuring device can be measured, according to an embodiment of the present invention.

[0023] Figure 7 This is a first embodiment of a position measuring device according to an embodiment of the present invention.

[0024] Figure 8 This is a second embodiment of a position measuring device according to an embodiment of the present invention.

[0025] Figure 9 This is an example of an implementation of a base station for a mobile communication network according to an embodiment of the present invention.

[0026] Figure 10 This is an example of an implementation of a location measurement server according to an embodiment of the present invention. Detailed Implementation

[0027] In the following, some embodiments of the invention will be described in detail with reference to the exemplary accompanying drawings. When adding reference numerals to the components in each drawing, it should be noted that the same reference numerals should be assigned to the same components whenever possible, even if they indicate the same components in different drawings. Furthermore, in describing the invention, detailed descriptions of related known configurations or functions may be omitted if it is determined that such detailed descriptions would obscure the subject matter of the invention.

[0028] Furthermore, in describing the components of the present invention, terms such as first, second, A, B, (a), (b) may be used. These terms are used only to distinguish a component from other components, and the nature, order, sequence, or number of the corresponding components are not limited by the terms. When a component is described as being "connected," "coupled," or "bonded" to another component, the component may be directly connected or bonded to the other component, but it should be understood that other components may be "inserted" between each component, or each component may be "connected," "coupled," or "bonded" through other components.

[0029] The wireless communication system of this invention is widely deployed to provide various communication services, such as voice and packet data. The wireless communication system includes user equipment (UE) and base stations (BS or eNB). In this specification, "user equipment" is a general concept referring to a terminal in wireless communication, and should be interpreted as including all user equipment (UE) in WCDMA, LTE, HSPA, etc., as well as MS (mobile station), UT (user terminal), SS (user station), and wireless equipment in GSM.

[0030] A base station or cell typically refers to a station that communicates with user terminals, and can also be referred to as Node-B, Evolved Node-B (eNB), Sector, Site, Base Transceiver System (BTS), Access Point, Relay Node, Remote Radio Head (dRRH), Radio Unit (RU), and small cell, among other terms.

[0031] That is, in this specification, the base station or cell should be interpreted in a comprehensive sense, indicating the part of the area or function covered by the Base Station Controller (BSC) in CDMA, the NodeB in WCDMA and the eNB or sector (site) in LTE, etc., with the aim of covering all kinds of coverage areas, such as large cells, macro cells, micro cells, pico cells, femtocells and relay nodes, RRH, RU, small cell communication range, etc.

[0032] Among the various cells listed above, since there is a base station controlling each cell, the term "base station" can be interpreted in two ways: i) regarding a radio area, it can refer to the equipment itself providing a large cell, macro cell, micro cell, pico cell, femtocell, or small cell; or ii) it can refer to the radio area itself. In case i), a base station can be referred to as: equipment that forms and provides a corresponding radio area and is controlled by the same entity, or equipment that interacts and cooperates with each other to form and provide a corresponding radio area. Depending on the configuration method of the radio area, eNB, RRH, antenna, RU, LPN, point, transmit / receive point, transmit point, receive point, etc., are embodiments of base stations. In case ii), from the perspective of the user terminal or from the perspective of adjacent base stations, the radio area to which signals are to be received or transmitted can be referred to as a base station.

[0033] Therefore, large cells, macro cells, micro cells, pico cells, femtocells, small cells, RRH, antenna, RU, low power node (LPN), point, eNB, transmit / receive point, transmit point and receive point are collectively referred to as base stations.

[0034] In this specification, user terminal and base station are two transmitting / receiving entities used to implement the technology or technical ideas described herein. User terminal and base station are defined as general terms and are not limited to specific terms or words. User terminal and base station are two (uplink or downlink) transmitting / receiving entities used to implement the technology or technical ideas described herein. User terminal and base station are defined as general terms and are not limited to specific terms or words. Here, uplink (UL or uplink) refers to the method by which a user terminal transmits and receives data to and from a base station, and downlink (DL or downlink) refers to the method by which a base station transmits and receives data to and from a user terminal.

[0035] There are no restrictions on the multiple access technologies applied to wireless communication systems. Various multiple access technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, and OFDM-CDMA can be used. Embodiments of this invention can be applied to resource allocation in asynchronous wireless communication fields evolving from GSM, WCDMA, and HSPA to LTE and Advanced LTE, 5G, as well as in synchronous wireless communication fields evolving to CDMA, CDMA-2000, and UMB. This invention should not be construed as limited to or confined to a specific wireless communication field, but rather should be interpreted as encompassing all technical fields to which the spirit of this invention can be applied.

[0036] For uplink and downlink transmissions, either Time Division Duplex (TDD) or Frequency Division Duplex (FDD) can be used, which uses different transmission times.

[0037] Furthermore, in systems such as LTE and LTE-Advanced, the uplink and downlink are configured based on a single carrier or carrier pair. The uplink and downlink transmit control information via control channels such as the Physical Downlink Control Channel (PDCCH), Physical Control Format Indicator Channel (PCFICH), Physical Hybrid ARQ Indicator Channel (PHICH), Physical Uplink Control Channel (PUCCH), and Enhanced Physical Downlink Control Channel (EPDCCH), and transmit data via data channels configured by the Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH).

[0038] Alternatively, control information can be sent using enhanced PDCCH or extended PDCCH (EPDCCH).

[0039] In this specification, a cell may refer to the coverage area of ​​a signal transmitted from a transmitting / receiving point, or a component carrier having the coverage area of ​​a signal transmitted from a transmitting / receiving point (transmitting point or transmitting / receiving point), or the transmitting / receiving point itself.

[0040] The wireless communication system in the application embodiment can be a cooperative multi-point transmission / reception system (CoMP system), a coordinated multi-antenna transmission system, or a cooperative multi-cell communication system, in which two or more transmitting / receiving points cooperate to transmit signals. A CoMP system may include at least two or more transmitting / receiving points and terminals.

[0041] Multiple transmit / receive points can be base stations or macro cells (hereinafter referred to as 'eNBs') and at least one remote radio head (RRH), which is connected to the eNB via optical cable or fiber and is thereby controlled in a wired manner, and has high or low transmit power in the macro cell area.

[0042] In the following text, a downlink refers to a communication or communication path from multiple sending / receiving points to a terminal, and an uplink refers to a communication or communication path from a terminal to multiple sending / receiving points. In a downlink, a transmitter may be part of multiple sending / receiving points, and a receiver may be part of a terminal. In an uplink, a transmitter may be part of a terminal, and a receiver may be part of multiple sending / receiving points.

[0043] In the following text, the situation of sending / receiving signals through channels such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH can be expressed as "sending and receiving PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH".

[0044] Additionally, in the following text, the description of sending or receiving PDCCH or sending or receiving signals via PDCCH may be used to indicate sending or receiving EPDCCH or sending or receiving signals via EPDCCH.

[0045] That is, the physical downlink control channel described below can refer to PDCCH or EPDCCH, or it can be used to mean both PDCCH and EPDCCH.

[0046] In addition, for ease of description, the EPDCCH described in this embodiment of the invention can also be applied to the part described as PDCCH, and the PDCCH can be applied to the part described as EPDCCH in this embodiment of the invention.

[0047] Additionally, the high-layer signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

[0048] The eNB performs downlink transmissions to the terminal. The eNB can transmit the Physical Downlink Shared Channel (PDSCH) and the Physical Downlink Control Channel (PDCCH). The PDSCH is the primary physical channel used for unicast transmission, and the PDCCH is used to transmit i) downlink control information, such as scheduling required for receiving the PDSCH; and ii) scheduling approval information for transmission on uplink data channels (e.g., the Physical Uplink Shared Channel (PUSCH)). The transmission and reception of signals through each channel will be described below in terms of transmission and reception on the respective channels.

[0049] This invention proposes an apparatus and method for estimating the location of a target terminal in a mobile communication system. Typically, a mobile communication system consists of a base station and terminals. In this invention, one or more location measuring devices are arranged around the target terminal to measure its transmitted signals, and based on this, the location of the target terminal is accurately measured. In this process, the base station needs to connect a communication channel to the terminal to measure the terminal's location; this invention provides a method for this purpose. In particular, this invention relates to a method for configuring a terminal in a standby state to transmit an uplink. However, it should be noted that the above method can be applied not only to target terminals in a standby state but also to target terminals in which a call has been initiated.

[0050] This invention relates to obtaining the location information of a terminal in a wireless communication system.

[0051] This invention is applicable to estimating the location of missing persons via mobile communication systems, estimating locations for lifesaving purposes in the event of a disaster or loss of life, and providing location-based services by accurately identifying the location of terminals.

[0052] It is anticipated that this invention will be applied to mobile communication base stations and related services.

[0053] The most relevant technology to this invention is the mobile communication system.

[0054] exist Figure 1 The configuration of the mobile communication system is shown in the figure. (Refer to...) Figure 1 The mobile communication system consists of a base station 10 and a terminal 11. As a method for estimating the terminal's location, the location is estimated based on the signal transmitted from the terminal 11. In this case, a commonly used method is to use the propagation delay of the signal required for the signal transmitted from the terminal 11 to reach the base station 10. Alternatively, the distance between the base station 10 and the terminal 11 can be estimated based on the propagation attenuation that occurs in the channel from the signal transmitted by the terminal 11 to the base station 10. To accurately measure the location of the target terminal, the target terminal needs to transmit uplink signals within a specific time period. Furthermore, the base station or a location measurement device measures the signals transmitted by the target terminal.

[0055] When terminal 11 is in a call state, terminal 11 continuously exchanges signals with base station 10. Therefore, base station 10 can perform distance or location measurements based on the signals transmitted by terminal 11. Additionally, if terminal 11 needs to transmit a specific signal for more precise measurements, base station 10 can command terminal 11 to transmit that specific signal. This specific signal can be a broadband periodic uplink signal.

[0056] On the other hand, when terminal 11 is in standby mode, most terminals 11 do not send uplink signals or send uplink signals at a very low frequency. Therefore, when the target terminal is in standby mode, it is difficult for the base station or location measurement equipment to measure distance or location based on the uplink signals sent by the target terminal.

[0057] Preferred embodiments of the invention will be described in detail below with reference to the accompanying drawings. Furthermore, in describing the invention, detailed descriptions of related known functions or configurations will be omitted where it is determined that such descriptions would unnecessarily obscure the subject matter of the invention. Additionally, the terminology described later is defined in consideration of the functions within the invention and may vary according to the intentions or habits of the user or operator. Therefore, definitions should be based on the entirety of this specification.

[0058] This invention proposes an efficient method for measuring the location of a target terminal. This method involves transmitting and receiving signals between a base station and the terminal, and deploying location measuring devices around the target terminal at the location to be tracked. The location measuring devices of this invention capture signals transmitted by the target terminal and measure the target terminal's location based on these signals. To accurately measure the terminal's location, one or more location measuring devices can be deployed around the terminal. The location measuring devices of this invention can be carried and used by a person, but can also be installed in vehicles and drones. Furthermore, conventional macrocell and small cell base stations can be used as the location measuring devices of this invention.

[0059] Figure 2 The operation of the position measuring device proposed in this invention is illustrated. (Refer to...) Figure 2 In a mobile communication system, base station 250 and target terminal 210 exchange signals with each other. The location measuring device of the present invention is arranged around the target terminal 210 whose location is to be measured to receive signals transmitted from the target terminal 210 and to measure the location of the target terminal 210 based on the received signals. At this time, the location of the target terminal 210 is measured based on the delay of the signal transmitted from the target terminal 210 to each location measuring device 240, the direction of the received signal, and the magnitude of the received signal. To measure the location of the target terminal 210 more accurately, one or more location measuring devices 220, 230, and 240 can be arranged around the target terminal 210. The location of the target terminal 210 can also be measured more accurately by combining the magnitude and time delay information of the signal received by the base station 250 with the information received by the location measuring devices.

[0060] As embodiments of the location measurement device of the present invention, reference can be made to the following Korean patent applications: Korean Patent Application No. 10-2018-0046139 "Method and Apparatus for Position Measurement of Mobile Communication Terminal", Korean Patent Application No. 10-2018-0048825 "Method for Setting Uplink Signal for Position Measurement of Mobile Communication Terminal", Korean Patent Application No. 10-2018-0101066 "Method and Apparatus for Measuring Terminal Position in Mobile Communication System", and Korean Patent Application No. 10-2019-0045762 "Location Measurement System for Mobile Terminal". Alternatively, a conventional base station can be used as the location measurement device.

[0061] This invention provides a method for measuring the position of a terminal in standby mode. Specifically, this invention relates to a method that allows a terminal in standby mode to transmit uplink signals. Furthermore, an objective of this invention is to minimize changes in external operations of the terminal in standby mode during the aforementioned process.

[0062] Sending data to a terminal in standby mode can be done by establishing a call or by sending SMS (Short Message Service) / MMS (Multimedia Messaging Service). In these methods, a call is typically established with the corresponding terminal when a large amount of or long-term communication is required (e.g., voice calls and file transfers). In this case, the call can only be established when the user of the receiving terminal allows the connection by pressing the send or answer button.

[0063] On the other hand, SMS / MMS is used to send relatively small amounts of data in a short period of time, even if the end user does not respond. Typically, in the case of SMS / MMS, the message sent to the terminal is displayed after data transmission is complete. In this invention, a method is proposed that allows the terminal to use the SMS / MMS function to send uplink signals when the target terminal for location measurement is in standby mode.

[0064] Figure 3 A flowchart of the method proposed in this invention is shown. (Refer to...) Figure 3 The base station sends a notification SMS / MMS message to the target terminal whose location is to be tracked via paging (S310). Upon receiving this notification, the target terminal sends a response signal to the base station (S320). The sending of this response signal is independent of the user's response at the target terminal. Then, the base station sends the message to be sent to the terminal. Typically, the message sending / receiving process is performed in the active state after the terminal transitions from idle to active. After successfully receiving the data to be sent by the base station, the terminal notifies the base station of the received message. Then, the terminal displays the message to the user.

[0065] exist Figure 3 In this process, the terminal sends a notification via SMS / MMS message to transition to an active state. In one embodiment, the base station requests the target terminal to report the channel state or the terminal's own state, functions, channel environment, etc., and the terminal responds, thereby performing actions similar to... Figure 3 In another embodiment, a similar operation can be performed by commanding the target terminal to register. However, in the above process, the message sending step of the base station can be omitted, and the system can be configured to send uplink signals to the terminal within a predetermined time period.

[0066] This invention proposes a method that allows a terminal in standby mode to send uplink signals required for location measurement via an SMS / MMS message sending process. When sending data via a regular call setup, a user response is requested, or a call is established via a smartphone application. This invention provides a method for setting up uplink signal transmission for the terminal even when no specific smartphone application is installed and the user does not respond.

[0067] In this invention, by means of Figure 3 In this process, the base station begins sending SMS / MMS messages to the target terminal, which is in standby mode, to measure its location. Typically, after receiving a response from the target terminal, the base station sends the message to be sent, and the terminal receives the message from the base station. This message sending and receiving usually occurs in the active state. When the terminal successfully receives a message during the message sending / receiving process, it not only notifies the base station but also outputs the message to the user via a terminal display or similar means.

[0068] If the terminal does not receive the message during message reception, it is determined that the entire SMS / MMS transmission process has not been successful, and the message will not be displayed on the screen. This invention proposes a method for setting uplink signal transmission required for location measurement during signal transmission, so that the target terminal cannot determine that it has received the message during SMS / MMS transmission. In other words, this invention proposes a method to terminate SMS / MMS transmission before the target terminal has determined that the reception of the message sent to the SMS / MMS has been completed.

[0069] In this invention, the base station sends an SMS / MMS notification to the terminal, and the terminal is in a state of receiving the message. Typically, message reception occurs in an active state. Uplink signal transmission required for location measurement is set to the terminal in this message receiving state. After a certain period of time, the SMS / MMS transmission is deactivated. Specifically, the process terminates if the terminal has not successfully received the SMS / MMS message. This prevents the terminal from outputting any messages to the mobile phone.

[0070] Various methods can be used in SMS / MMS message sending to achieve the purpose of this invention, which are summarized as follows:

[0071] (1) The base station does not send messages to the terminal. That is, after transitioning to the active state for message sending, the terminal is configured to send uplink signals without sending messages.

[0072] (2) The base station deliberately sends a message with a CRC error. In this case, the terminal has difficulty successfully receiving the message.

[0073] (3) A large amount of noise or interference signals are added to the transmitted signal and sent, so that the terminal cannot successfully receive the message.

[0074] (4) In order to prevent the terminal from estimating the channel required for reception, it may not send signals such as reference signals or pilots for channel estimation, or send incorrect signals.

[0075] (5) In channel conditions, transmit data with an MCS (modulation and coding scheme) higher than the MCS (modulation and coding scheme) that can receive data.

[0076] These methods involve intentionally sending signals during SMS / MMS transmission that cause message reception to fail. By using these methods, the terminal can be configured to send uplink signals while maintaining a connection with the terminal. Of these methods, the most efficient in terms of resource allocation is the first method (1), which does not send any messages.

[0077] In this manner, the base station activates a standby terminal by sending an SMS / MMS and configures the terminal to transmit uplink signals (S330). The base station configures the uplink signal transmission to be repeated within a predetermined time period or longer, so that the location measurement device can easily detect and measure the target terminal's signal. Subsequently, the base station notifies the location measurement device and the location measurement server of the information related to this transmission to measure the target terminal's uplink signal.

[0078] Additionally, according to similar embodiments, when the target terminal used for location measurement is in standby mode, the base station of the mobile communication network can perform a similar operation by sending a paging command to the target terminal. This paging message is not intended to establish a voice call or data channel, but rather performs a similar function by commanding the terminal's status, channel environment, or functionality, or by commanding the terminal's registration or channel status. The paging is characterized in that even if the user of the target terminal does not input a response to the terminal, the target terminal sends a response signal regarding the paging to transition to an active state. Furthermore, the paging is characterized in that it does not impose or minimize changes to the external shape of the target terminal. That is, it is characterized in that the user of the target terminal cannot identify the paging and subsequent uplink channel settings through the terminal's display, sound, or vibration. In this invention, even if the user of the target terminal does not respond, the base station transitions the target terminal to an active state. Additionally, the base station sends an uplink signal to the target terminal and notifies the location measurement server and location measurement equipment of information related to the uplink signal transmission. This information includes notification that the uplink signal transmission of the target terminal has begun. When a location measuring device learns that a target terminal has begun transmitting an uplink signal, it measures the target terminal's uplink signal based on information related to the uplink transmission. The location measuring device then notifies the location measuring server of the measured uplink signal, and the location measuring server calculates the target terminal's location based on this measurement.

[0079] In another embodiment, the location measuring devices of the present invention can communicate with each other to share their location and measurement information, and based on this, the location of the target terminal can be calculated. Additionally, the location measuring devices of the present invention can send location and measurement information to another location measuring device, where the location of the target terminal is calculated.

[0080] Furthermore, the base station of the present invention can be configured to periodically transmit uplink signals even after the target terminal transitions from a standby state to an active state. To measure the location of the target terminal, the target terminal needs to transmit uplink signals. In the present invention, when the target terminal transmits uplink signals, the target terminal, which has transitioned from a standby state to an active state, can periodically or frequently transmit uplink signals within a predetermined time period. For example, in the case of an LTE system, the target terminal periodically or frequently transmits the PUSCH channel or the SRS channel. For example, the base station can request the target terminal to transmit specific data via a broadband uplink. In one embodiment, the base station can command the transmission of channel information about the downlink measured by the target terminal at a very low MCS (a lower MCS than the allocated resources) at a specific period. In another embodiment, the base station can command the transmission of parameters related to the target terminal's transmit power (e.g., power margin reports) or parameters related to the target terminal's functionality at a low MCS at a specific period. Additionally, PUDDC can be transmitted periodically.

[0081] Additionally, the target terminal can be configured to transmit uplink signals with two or more different channel settings. These two different channels are referred to as the first uplink signal and the second uplink signal. The first uplink signal is a signal characterized by high-frequency transmission in narrowband, and the second uplink signal can be configured to be a signal characterized by wideband low-frequency transmission. For example, PUCCH and PUSCH can be transmitted. Alternatively, it can be configured to transmit PUCCH and SRS. Simultaneous configuration of SRS and PUSCH is also possible. As another example of an embodiment, narrowband frequent PUSCH configuration and wideband low-frequency PUSCH can be transmitted simultaneously.

[0082] The location estimation of the target terminal in this invention can be performed using a single uplink signal, but it can also be performed based on measurements from a location measuring device and a base station, using two or more different signals. Narrowband uplink signals are advantageous in calculating the average power of the target terminal. By measuring propagation delay, wideband signals can be used for more accurate distance and location measurements. Typically, the difference lies in the fact that the terminal does not frequently transmit wideband signals in the uplink, unlike in cases where SMS / MMS are sent to the terminal acting as a base station or in paging requests for measurements, registration, status information, etc., from the terminal proposed in this invention.

[0083] In this invention, the approximate location of the target terminal is found using the positioning of a conventional mobile communication network. During this process, the target terminal's location can also be located using devices such as Wi-Fi or GPS. In this process, cell information of the mobile communication network to which the target terminal belongs and the location information of the base station in that cell can be obtained. Furthermore, approximate location information of the target terminal can be obtained. And, information regarding the accuracy of the target terminal's location information can be obtained. The accuracy of the location information can be given in the form of a radius around a specific location.

[0084] A searcher who has obtained the above information possesses a location measurement device and requests to establish a link to the target terminal from its vicinity. A link establishment request allows the searcher to request call establishment from the location measurement server via their location measurement device. Alternatively, a call establishment request can be made by directly inputting the request into the location measurement server.

[0085] When a call setup request is entered, the location measurement server requests call setup from the mobile communication network. Typically, a base station that can maintain the optimal channel condition with the target terminal in the mobile communication network is selected, and call setup is performed. When the target terminal is in standby mode, it is set to a mobile active state via paging as proposed in this invention. Furthermore, in the active state, the base station sets the uplink signal transmission of the target terminal. Subsequently, the base station of the mobile communication network sends the call setup and uplink signal transmission setting information of the target terminal to the location measurement server. The location measurement server sends the call setup and uplink signal transmission setting information of the target terminal to the location measurement device to perform signal detection and measurement of the target terminal. The aforementioned call setup information may include the fact that a call has already been established.

[0086] If the target terminal is in standby mode during the above process, it may take some time to establish a call with the base station. This is usually due to time delays that occur during paging and channel setup. Therefore, the location measurement device has information about the status of the link between the current mobile communication network base station and the target terminal and notifies the searcher of this information.

[0087] During the above process, the location measurement equipment and the location measurement server need to know the status of the link between the base station and the target terminal. That is, if the target terminal is in standby mode, the target terminal can be in one of the following states.

[0088] (1) Standby state

[0089] (2) Call setup in progress

[0090] (3) Activation status or measurement signal setting in progress

[0091] (4) In the active state, the measurement signal is being transmitted.

[0092] In a mobile communication network, the base station that has established a link with the target terminal notifies the location measurement server of the link status. The location measurement server then notifies the location measurement device of this information. Therefore, the location measurement device and the location measurement server will only perform positioning on the target terminal when the target terminal sends a measurement signal in an active state. Furthermore, the location measurement device can notify the searcher by displaying the target terminal's status on a monitor.

[0093] In the above states, the state of call setup in progress of the target terminal in (2) and the state of activation or uplink signal setting of the target terminal in (3) can be merged into one to define the call setup and uplink signal setting states of the target terminal.

[0094] If a call has been established with the base station and the target terminal has been located while it is in an active state, the target terminal may be in one of the following states.

[0095] (1) Normal activation state (before requesting to locate the target terminal)

[0096] (2) In the active state, the measurement signal setting is in progress.

[0097] (3) In the active state, the measurement signal is being transmitted.

[0098] The base station of the mobile communication network notifies the location measurement server of the link status with the target terminal. The location measurement server then notifies the location measurement device of this information. Therefore, the location measurement device and the location measurement server only perform location tracking on the target terminal when it sends a measurement signal while in an active state. Furthermore, the location measurement device can notify the searcher by displaying the target terminal's status on its display. The location measurement device's status can be categorized into initial state (before requesting location tracking of the target terminal), call setup state (after requesting location tracking of the target terminal), uplink signal setup in progress state, and measurement uplink signal transmission state, etc., and can be displayed on the location measurement device's screen. Additionally, the location measurement device only performs detection and measurement when the target terminal is in the measurement uplink signal transmission state. This state is shared with the location measurement server, and the location measurement server only calculates the target terminal's location when the target terminal is in the measurement uplink signal transmission state.

[0099] If the base station periodically sends random access signals while the target terminal is in standby mode, the location measurement server and location measurement equipment can locate the target terminal by sending random access signals as uplink signals for measurement, even if the target terminal is in standby mode. Considering this, the base station of the mobile communication network can notify the location measurement equipment and location measurement server whether the target terminal is in standby or active mode.

[0100] In another embodiment of the invention, the position measuring device may be in one of the following states.

[0101] (1) Standby state

[0102] (2) The uplink channel of the target terminal is set to standby mode.

[0103] (3) Measurable status of the target terminal (uplink signal transmission status of the target terminal)

[0104] The standby state of a location measurement device refers to the state where the device has not yet sent a location measurement request to the target terminal. In other words, this may mean that the base station of the mobile communication network has not yet set up the uplink signal for measurement for the target terminal. The uplink channel setting standby state of the target terminal refers to the state where the base station is setting up the uplink signal for measurement for the target terminal, or the location measurement device has not yet received channel setting information, resource allocation information, or terminal identification information about the target terminal. The measurable state of the target terminal refers to the state where the base station sets up the uplink signal for measurement for the target terminal, and the location measurement device has acquired the channel setting, resource allocation information, or terminal identification information of that uplink signal. In the measurable state of the target terminal, the location measurement device and the location measurement server can measure the signal of the target terminal. Specifically, in this state, the location measurement device reports the measurement results of the uplink signal of the target terminal to the location measurement server, and the location measurement server calculates the location of the target terminal based on these measurement results.

[0105] Figure 4 The signal flow and status between the location measurement device, location measurement server, and base station proposed in this invention are illustrated. (Refer to...) Figure 4The location measurement device is initially in standby mode. When the uplink channel setting of the target terminal is sent to the mobile communication network, in response, the base station notifies the location measurement server and the location measurement device that it has received the call and uplink channel setting request for the target terminal. Upon receiving this response from the mobile communication network, the location measurement device transitions from standby mode to target terminal uplink channel setting standby mode. As another example, when the location measurement device receives predetermined input from the operator of the location measurement device searcher, the location measurement device transitions from standby mode to target terminal uplink channel setting standby mode. The base station sets up the uplink channel for measurement for the target terminal and sends this information to the location measurement server and the location measurement device. This information may include the uplink channel setting of the target terminal, resource allocation information, and identification information of the target terminal. After receiving this information, the location measurement device and the location measurement server switch to the target terminal uplink channel measurement state and perform signal measurement of the uplink channel of the target terminal. In this state, the location measurement device measures the signal of the target terminal and sends it to the location measurement server, which then calculates the location of the target terminal based on the measurement result. The location measuring device displays this status on the monitor so that the searcher can know the status of the target terminal.

[0106] Figure 5 A diagram showing the state transitions of the position measuring device proposed in this invention is illustrated. Figure 5 Although an embodiment illustrating three states of the location measuring device is shown, it should be noted that this state can be divided into two or more sub-states, or two states can be combined to define a single state for use. Furthermore, the state of the location measuring device can be shared with a location measuring server, ensuring that both operate in the same state. In particular, it is crucial that both are in the same state when the target terminal is in a measurable state.

[0107] Reference Figure 5When the power is on, the location measuring device enters a standby state. When the location measuring device receives a location request for a target terminal from the searcher or mobile communication network operating the device, it transitions from standby to a target terminal uplink setting standby state. Furthermore, after completing the uplink setting of the target terminal, if information related to the uplink setting of the target terminal is obtained from the mobile communication base station, the location measuring device transitions from the target terminal uplink setting standby state to a target terminal uplink signal measurable state, capable of measuring the target terminal's signal. The base station can be configured to transmit the target terminal's uplink signal during a predetermined time T1. The location measuring device can perform uplink signal measurement of the target terminal during this predetermined time T1. In another example, the base station can cause the target terminal to stop transmitting uplink signals after a predetermined time. In this case, the location measuring device can either transition to a standby state or to the target terminal uplink setting standby state. If uplink transmission regarding the target terminal terminates, the location measuring device transitions back to a standby state. If the uplink signal transmission of the target terminal is resumed after a predetermined time T2, the location measurement device transitions to the target terminal uplink setting standby state. In this standby state, the location measurement device deletes the target terminal's information, previous settings, and measurement results. Conversely, when the location measurement device transitions to the target terminal uplink signal setting standby state, it continuously stores and maintains the target terminal's information, previous channel settings, and all or part of the measurement results. However, in this state, channel measurements and measurement results for the target terminal are not sent to the location measurement server. Additionally, when the target terminal's location measurement is complete and no further measurement is required, the mobile communication network can stop the uplink signal setting for the target terminal, and in this case, the location measurement device transitions to standby. Alternatively, by inputting a search termination message to another communication server or location measurement server, these servers can notify the location measurement device and the mobile communication base station.

[0108] exist Figure 5 In the definition of the state of a position measurement device, one or more substates can be placed in each state. For example, in Figure 5 When the uplink signal of the target terminal is measurable, the location measuring device attempts to measure the uplink signal of the target terminal. However, in this state, the signal of the target terminal is not always detectable. Depending on the positions of the location measuring device and the target terminal, there are detectable areas and undetectable areas. Therefore, the uplink signal measurable state of the target terminal can be divided into sub-states where the target terminal's signal is successfully detected and sub-states where the target terminal's signal is not detected.

[0109] Figure 6 This diagram illustrates the state transitions between two sub-states when the position measuring device of the present invention is in a state where the uplink signal of the target terminal is measurable. (Refer to...) Figure 6 The position measuring device exists in either an undetected sub-state or a detected sub-state of the target terminal when the uplink signal of the target terminal is measurable. Initially, when transitioning from a target terminal uplink setting standby state to a target terminal uplink signal measurable state, it enters the undetected sub-state since the target terminal signal has not yet been detected. However, when the position measuring device moves and approaches the target terminal, it detects the target terminal signal and transitions to the target terminal detection sub-state. On the other hand, if the target terminal cannot detect the signal in the target terminal detection sub-state due to changes in the propagation environment or movement, it transitions to the target terminal undetected sub-state. Thus, it alternates between the sub-state for detecting the target terminal signal and the sub-state for failing to detect the signal, depending on changes and movement in the propagation environment.

[0110] Specifically, the uplink signal of the target terminal can only be actually measured when the location measuring device is in the target terminal detection sub-state. Therefore, it is necessary to notify the searcher through the display of the location measuring device whether the location measuring device has detected the signal of the target terminal. Additionally, the status can be shared by notifying the location measuring server whether it is in the detected state. Furthermore, each location measuring device can obtain location information and status / sub-state information such as detection status from other location measuring devices searching for the same target terminal, and display it on the display. In the above process, the location measuring server receives location information, detection status, measurement results, etc., from the location measuring devices and shares them with other location measuring devices searching for the same target terminal. Furthermore, the location measuring server can output the location, status / sub-state information, measurement information, and the calculated location or location range of the target terminal from the location measuring devices on the display. Moreover, this information can be transmitted to another control room and displayed on a screen.

[0111] The location measuring device notifies the location measuring server by sending its status / sub-status information. The location measuring server manages information about the status / sub-status of each location measuring device. In the above process, the only situation in which a location measuring device can meaningfully measure the uplink signal of the target terminal is when the target terminal is in the target terminal detection sub-state, under signal-measurable conditions. Therefore, the location measuring device only measures the uplink signal of the target terminal and sends it to the location measuring server when it is in this sub-state. Furthermore, the location measuring server calculates the location of the target terminal based on the measurement results of the target terminal detection sub-state from the measurement results of multiple location measuring devices and transmits the calculated location or range of the target terminal to all location measuring devices.

[0112] The present invention has been described in relation to an embodiment in which a target terminal is measured via a location measurement server. However, the concepts of the present invention can also be applied to cases where location measurement devices share measurement information about the target terminal via a communication channel, and where one or more location measurement devices calculate the location of the target terminal. That is, status / sub-state information can be shared between location measurement devices via a communication channel, and the location of the target terminal can be measured and calculated by reflecting this status / sub-state information. For example, when one location measurement device sends a measurement result to another location measurement device via a communication channel, it can be limited to the detection sub-state of the target terminal. Furthermore, when calculating the location of the target terminal, the measurement results of the location measurement devices under the detection sub-state of the target terminal can be considered only. Additionally, not only can the status / sub-state information of each location measurement device be displayed on the screen, but the status / sub-state information of other location measurement devices can also be displayed on the screen so that the searcher can be aware of this information.

[0113] This invention relates to a method in which a base station receives approximate location information of a target terminal from a mobile communication network, places one or more location measuring devices near that location, sets up uplink signal transmission for the target terminal, and the location measuring devices measure the uplink signal of the target terminal. When the location measuring devices receive the approximate location information of the target terminal, they can receive information about a coordinate on a map. Additionally, they can also receive location information of the base station of the cell to which the target terminal belongs. Furthermore, one of the required pieces of information is the ID information of the base station of the cell to which the target terminal belongs. This information is called the cell ID in LTE systems. Initially, the base station of the mobile communication network transmits the cell ID information of the base station to a location measuring server, and the location measuring server transmits this information to the location measuring devices. In another example, the mobile communication network can directly transmit the cell ID information to the location measuring devices.

[0114] The location measurement device of this invention requires the use of a downlink receiver to receive signals from a base station that forms a link with the target terminal. This is done by receiving downlink signals to obtain time synchronization information and uplink time information. Therefore, the location measurement device of this invention needs to operate while receiving downlink signals from a base station with that cell ID based on the base station's cell ID information. If no signal from the base station forming a link with the target terminal is received, the location measurement device may be unable to reliably detect and measure the uplink signal of the target terminal.

[0115] Another reason is that when located in an area that receives signals from a base station that forms a link with the target terminal, the probability of being close to the target terminal is higher, so it is necessary to receive signals from a base station with that cell ID.

[0116] To this end, the location measurement device acquires the cell ID information of the base station that has already established a link with the target terminal and determines whether it is stably receiving downlink signals from that cell ID base station. This can be determined by whether the RSSI or SNR of the downlink signal received from that base station is equal to or greater than a predetermined threshold. Furthermore, this information is transmitted to the location measurement server.

[0117] The location measurement device acquires the cell ID information of the base station that forms a link with the target terminal and displays on a screen whether the signal from the base station with that cell ID is being received stably. In another embodiment, the signal quality of the base station can be displayed on the location measurement device's screen in the form of SNR, RSSI, etc. Furthermore, this quality information can be sent to a location measurement server along with measurement information about the target terminal.

[0118] The location measurement equipment displays an estimated value or range of the target terminal's location on a map. Furthermore, it can display not only its own location on the map but also the locations of other location measurement equipment participating in the search for the target terminal. It can also indicate whether each location measurement equipment is stably receiving downlink signals from the base station that forms a link with the target terminal.

[0119] Typically, a cell in a mobile communication system is divided into multiple sectors. Therefore, each sector has a unique cell ID. Base stations in multiple sectors within a single cell are usually synchronized in time. Additionally, time synchronization is typically maintained between several nearby cells.

[0120] In this scenario, even if the location measuring device is not time-synchronized with the base station that forms a link with the target terminal, it can still obtain time synchronization information from another base station to detect the uplink signal of the target terminal. Considering this environment, when the mobile communication network sends the cell ID of the base station that forms a link with the target terminal, it can also send the cell IDs of other base stations that maintain time synchronization between adjacent base stations. If all base stations maintain time synchronization, the base station can notify the location measuring device of this information. As another example of this process, the mobile communication network can notify the location measuring server of this fact, and the location server can then notify the location measuring device.

[0121] Based on this information, the location measuring device attempts to receive downlink signals from the base station with which it has established a link. If stable signal reception from the base station is difficult, synchronization between that base station and other base stations maintaining signal synchronization is obtained. The location measuring device can then notify the location measuring server of this information. This process is performed based on the cell ID information of the base stations maintaining time synchronization as described in the previous process.

[0122] The location measurement device acquires the cell ID information of the base station that forms a link with the target terminal and displays on a screen whether the signal from the base station with that cell ID is being received stably. In another embodiment, the signal quality of the base station can be displayed on the location measurement device's screen in the form of SNR, RSSI, etc. If the base station has difficulty detecting the signal, a downlink signal that is time-synchronized with the base station can be received from another base station, the quality of that signal can be measured, and time synchronization can be ensured based on that signal. The location measurement device can display this status on the screen. Additionally, it can display whether the location measurement device obtains a time reference by receiving the downlink signal from the base station that forms a link with the target terminal, or whether the location measurement device obtains a time reference from the downlink signal of another base station, and notify this to the location measurement server. In another example, the location measurement device can display the cell ID of the base station it is currently receiving from for time reference and notify the location measurement server. Furthermore, this status information and the downlink quality information of the currently received base station can be sent to the location measurement server along with measurement information about the target terminal.

[0123] Location measurement devices can display estimated values ​​or estimated ranges of the target terminal's location on a map. Furthermore, they can display not only their own location but also the locations of other location measurement devices participating in the search for the target terminal. The downlink cell ID information received by each location measurement device can be shared among them. Additionally, each location measurement device can indicate whether other location measurement devices are stably receiving downlink signals from the base station forming a link with the target terminal. Moreover, it can indicate which base station's downlink signal each location measurement device is receiving to ensure time synchronization.

[0124] In this invention, the location measurement server calculates the location of the target terminal based on the uplink signal measurement results of the target terminal from the location measurement devices. When calculating the location of the target terminal based on the measurement results of the location measurement devices, the location of the target terminal is calculated by reflecting the quality of the downlink signal received by each location measurement device. For example, if the quality of the downlink signal received by the location measurement device is poor, the measurement results of the target terminal signal from the location measurement device can be ignored, or a low weight can be used to calculate the location of the target terminal.

[0125] In this invention, when the mobile communication network receives a request to set uplink signals for location measurement of a target terminal, it maintains the previously set uplink signals or sets new uplink signals for the target terminal to achieve more accurate positioning, and then notifies the location measurement device of all or part of the information regarding the set uplink signals. During this process, a request for location measurement can be made from the location measurement device, the location measurement server, an emergency rescue center, etc.

[0126] When a base station of a mobile communication network receives a location measurement request for a target terminal, it sends the target terminal's uplink signal configuration resource allocation information and identification information to the location measurement device. The base station can send this information directly to the location measurement device, or it can send it to a communication server, which in turn can forward it to the location measurement device. The location measurement server can function as the communication server. Based on this information, the location measurement device of this invention detects and measures the uplink signal of the target terminal.

[0127] In order for a location measuring device to detect and measure the uplink signal of a target terminal, the location measuring device needs to acquire the signal settings and resource allocation information of that uplink signal. As an example of the above process, the location measuring device receives the terminal's identification information and analyzes the downlink signal transmitted by the base station based on this identification information, and obtains the resource allocation information and signal settings information sent to the target terminal. The RNTI of the target terminal can be used as this identification information. In another embodiment, the base station of the mobile communication network notifies the location measuring device of the uplink signal settings and resource allocation information of the target terminal. In yet another embodiment, a specific signal settings and resources are pre-committed between the base station of the mobile communication network and the location measuring device, and the base station sets the uplink signal transmission of the target terminal according to this commitment, and only notifies the location measuring device whether the target terminal is transmitting a signal. It should be noted that, regardless of the methods described above, the concepts proposed in this invention can be applied to various techniques for measuring the location of a target terminal.

[0128] Figure 7 This is a diagram illustrating the configuration of a position measuring device according to an embodiment of the present invention. (Refer to...) Figure 7The location measuring device of the present invention includes one or more downlink signal receiving units 710 and one or more uplink signal receiving units 720 to receive mobile communication signals. Additionally, the location measuring device includes a control unit 730 for controlling the received signals. Optionally, the location measuring device may include: a communication unit 740 for communicating with a base station, a location measuring server, or another location measuring device; a GPS receiving unit 770 for performing absolute time synchronization; an input unit 750 for receiving input from a user; and a display unit 760 for displaying information processed by the control unit 730.

[0129] Here, the downlink signal receiving unit 710 and the uplink signal receiving unit 720 can be an LTE downlink signal receiving unit and an LTE uplink signal receiving unit, respectively. In this invention, the downlink signal receiving unit can operate by setting a frequency band in which control information regarding the uplink signal transmitted by the target terminal is transmitted is transmitted. Although this invention is described based on an LTE system, it can be readily 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, then the downlink signal receiving unit 710 and the uplink signal receiving unit 720 are implemented as receivers for the GSM or W-CDMA system, respectively.

[0130] The LTE downlink signal receiving unit acquires system time synchronization by capturing the initial LTE downlink signal, and also obtains the base station ID and system information. Furthermore, by measuring the signal transmitted from the base station, the downlink signal strength can be measured and displayed on a screen. Additionally, the base station ID or whether the user is within the service range of the desired base station is displayed. This allows confirmation that the user is within the service range of the desired base station. The downlink receiver receives BCCH and other data, and obtains system information.

[0131] The LTE uplink signal receiving unit detects the uplink signal sent by the target terminal and performs measurements to obtain location-related information.

[0132] To detect and measure the uplink signal of a target terminal, the location measuring device needs to acquire the uplink signal settings and resource allocation information sent by the target terminal. In one embodiment of the invention, the location measuring device acquires the identification information of the target terminal, and based on this, uses the downlink signal receiving unit 710 to receive the downlink signal sent by the base station, and analyzes it to obtain the uplink signal settings and resource allocation information of the target terminal. In the above process, the base station of the mobile communication network can notify the location measuring device of the target terminal's identification information after receiving the location request from the target terminal. Additionally, after notifying the communication server of this information, the communication server can notify the location measuring device. Furthermore, in another embodiment of the invention, the uplink settings and resource allocation information of the target terminal can be received from the communication server through the communication unit 740, and the location measuring server can be used as the communication server. In another embodiment, the mobile communication network and the location measuring device can be configured to send the target terminal's signal at predetermined resources and times, and can use the resource allocation information and setting information. The control unit 730 acquires the uplink channel settings and resource allocation information of the target terminal and controls the process of detecting and measuring the target terminal's signal.

[0133] Furthermore, the position measurement device of the present invention can ensure an absolute time reference and calculate the difference between the time points when each position measurement device receives the uplink signal from the target terminal. Figure 7 In this embodiment, the location measuring device performs time synchronization based on GPS signals received from the GPS receiving unit 770, thereby achieving this function. In this process, not only GPS can be used, but other technologies (e.g., SBAS, Galileo, etc.) can also be used for positioning or time information, or they can be used in combination with GPS. However, in this invention, any method capable of ensuring time synchronization between different types of location measuring settings, or capable of distinguishing the difference between arrival times, can be used. For example, time synchronization can be achieved by pre-aligning the time between location measuring devices using a high-precision clock, or by any method or technology capable of calculating the relative difference in time. Additionally, any method capable of distinguishing the difference between the time point when a specific signal is received from the LTE downlink signal receiving unit and the arrival time of another user can be used to perform time measurement. Location measurement can be performed based on the time difference with the time point when the uplink signal is received. Information about this reception time is sent to the location measuring server.

[0134] In this invention, a separate communication unit 740 can be used when communication with a location measurement server or direct communication with another location measurement device is required. The communication unit 740 can use a frequency band different from the frequency band of the signal from the target terminal. This is to prevent the communication device from interfering with the uplink signal transmitted by the target terminal.

[0135] Figure 7 The location measurement device includes an output device such as a display to show the user the location of the target terminal. Additionally, it includes an input unit 750 for user input, through which the user can input additional information, such as manually entering information about the current location of the location measurement device, thereby improving the accuracy of location measurement. Furthermore, the searcher can input a location request for the target terminal through the input unit 750.

[0136] Figure 7 The control unit 730 controls the operation of the aforementioned position measuring device. The control unit 730 is connected to each device and is used to control the information reception, measurement, communication, input / output, etc., as described herein.

[0137] Figure 8 This is a diagram illustrating the configuration of a position measuring device according to another embodiment of the present invention. Figure 7 The difference in the configuration of the location measurement device is that the number of components of the location measurement device of the present invention is reduced by connecting functions such as communication with other external devices (location measurement server or other location measurement devices), display and input devices to an external terminal 850 such as a smartphone or tablet. Figure 8 The location measurement device includes a downlink signal receiving unit 810, an uplink signal receiving unit 820, a control unit 830, and a GPS receiving unit 840, and its communication, display, and input functions with other devices are realized by connecting to a terminal 850 such as a commercial tablet or smartphone. Figure 8 The dashed rectangle in the image shows an implementation of the new position measurement device. It can be connected using a wired connection such as USB. Figure 8 The connection between the control unit 830 and the terminal 850 can be established, and a wired connection such as Wi-Fi can also be used. In another example, both wired and wireless connections can be provided, and the choice and use can be made as appropriate. Figure 8 In a position measurement device, simple input / output devices for power on / off, function settings, etc., can be added to the position measurement device within the dashed rectangle.

[0138] Figure 9 The structure of a base station in a mobile communication network according to the present invention is shown. (Refer to...) Figure 9The base station includes a downlink signal transmitting unit 910 and an uplink signal receiving unit 920. The downlink signal transmitting unit 910 transmits signals to the terminal. The uplink signal receiving unit 920 receives uplink signals transmitted by the terminal. Additionally, the mobile communication network base station includes a communication unit 940, used to transmit the target terminal's RNTI information or channel setting and resource allocation information to the location measurement device. The base station notifies the location measurement device of the target terminal's status. Furthermore, it can transmit the cell IDs of base stations forming a link with the target terminal and the cell ID information of base stations maintaining adjacent time synchronization. The communication unit 940 can directly transmit information to the location measurement device. Alternatively, the target terminal can transmit information to another communication server, which can then transmit the information to the location measurement device. In this case, the location measurement server can act as a communication server. Alternatively, the base station can communicate using a downlink transmitter and an uplink receiver without a separate communication unit 940, which transmits the target terminal's identification information, channel setting and resource allocation information, and cell ID-related information of the base station. Additionally, the control unit 930 uses the downlink signal transmission unit 910 and uplink signal reception unit 920 of the base station to set the signal transmission to the target terminal. It also performs a function to check whether the signal set by the uplink signal reception unit 920 is correctly received.

[0139] Figure 10An embodiment of the configuration of the location measurement server of the present invention is shown. The location measurement server includes a communication unit 1010. The communication unit 1010 has communication functions with a mobile communication network and communication functions with a location measurement device. The communication function with the mobile communication network receives identification information or uplink channel settings and resource allocation information of a target terminal. Additionally, it receives status information of the target terminal, cell ID information of the base station forming a link with the target terminal, and cell ID information of the base station maintaining adjacent time synchronization. Furthermore, when a location measurement request for a specific target terminal is sent to the location measurement server, a link setting request for the target terminal is sent to the mobile communication network. This location measurement request can be made by the location measurement device or an emergency rescue center, or it can be made by connecting an input device to the location measurement server via an input device. When the location measurement device requests location measurement, it sends it through the communication unit 1010. At this time, the target terminal's telephone number, IMSI, etc., can be used as the target terminal's identification information. Alternatively, the terminal's serial number or TMSI can be used. The communication function with the location measurement device performs the function of communicating with the location measurement device. The location measurement device sends the signal measurement results of the target terminal, and based on this, the location measurement server calculates the location of the target terminal and sends it back to the location measurement device. The signal measurement results include information such as the signal strength, time delay, and receiving direction of the target terminal. Additionally, it may include information about the location of the location measurement device and the time used to measure the signal.

[0140] The location measurement server includes a control unit 1020. The control unit 1020 controls the following functions: requesting the mobile communication network to establish a link with the target terminal, and receiving the target terminal's identification information or resource allocation and channel setting information from the base stations of the mobile communication network. Additionally, it receives the target terminal's status information, the cell ID of the base station establishing the link with the target terminal, and the cell IDs of other base stations maintaining adjacent time synchronization. The location measurement server performs the function of sending information received from the mobile communication network to location measurement devices. Furthermore, it receives uplink measurement results of the target terminal from one or more location measurement devices, calculates the target terminal's location, and sends the results to the location measurement devices. Additionally, the control unit controls the following functions: receiving a location measurement request for the target terminal from the location measurement devices or another device, and sending the request to the mobile communication network.

[0141] As an example of an embodiment of the position measuring device of the present invention, the contents disclosed in Korean Patent Application No. 10-2018-0046139 "Method and Apparatus for Position Measurement of Mobile Communication Terminal", Korean Patent Application No. 10-2018-0048825 "Method for Setting Uplink Signal for Position Measurement of Mobile Communication Terminal", Korean Patent Application No. 10-2018-0101066 "Method and Apparatus for Measuring the Position of Terminal in Mobile Communication System", and Korean Patent Application No. 10-2019-0045762 "Position Measurement System for Mobile Terminal" may be used or partially modified.

[0142] In this invention, when attempting to measure the position of a target terminal in standby mode, an uplink signal capable of position measurement can be sent without altering or minimizing the operation of the target terminal. Furthermore, a method for effectively measuring the position of a target terminal is proposed. The position measurement device can measure distance, position, etc., based on the uplink signal sent by the target terminal.

[0143] The above description is merely an exemplary illustration of the technical concept of the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Furthermore, the embodiments disclosed in this invention are not intended to limit the technical concept of the invention, but are for illustrative purposes; the scope of the technical concept of the invention is not limited by these embodiments. The scope of protection of this invention should be interpreted by the appended claims, and all technical concepts within the equivalent scope should be interpreted as being included within the scope of the claims of this invention.

[0144] Cross-reference to related applications

[0145] This application claims priority to patent applications 10-2018-0048825, filed in Korea on April 27, 2018, and 10-2019-0048789, filed in Korea on April 25, 2019, the entire contents of which are incorporated herein by reference. Furthermore, if this application claims priority from a country outside the United States for the same reasons as described above, the entire contents of that country are incorporated herein by reference.

Claims

1. A base station, characterized by The base station includes: A communication unit for receiving uplink signal setting requests from a location measuring device or a server communicating with the location measuring device regarding a terminal in standby mode; A control unit, configured to generate a state change signal to indicate a state change of the terminal in standby mode, and to generate a downlink signal for the terminal to transmit an uplink signal; and The transmitting unit is used to transmit the state change signal and the downlink signal to the terminal. The uplink signal is used to measure the uplink signal of the terminal in the location measuring device. The measured uplink signal is used to obtain the location of the terminal. The communication unit sends the terminal's status change information and the uplink signal's channel setting information to the location measuring device or a server communicating with the location measuring device.

2. The base station of claim 1, wherein, The communication unit also sends the terminal's identification information to the server or location measurement device.

3. The base station of claim 1, wherein, After receiving a location request for the terminal in standby mode, the control unit generates a state change signal to indicate a change in the state of the terminal in standby mode, and generates a downlink signal for the terminal to send uplink signals. The transmitting unit sends the state change signal and the downlink signal to the terminal.

4. The base station according to claim 1, characterized in that, The receiving unit receives a link status information request signal from the location measuring device or the server, which requests link setting status information between the base station and the terminal. The control unit responds to the link status information request signal to send the link setting status information between the base station and the terminal to the location measurement device or the server.

5. The base station according to claim 1, characterized in that, The state change signal configures the terminal in standby mode to send uplink signals unchanged at the user interface of the terminal.

6. A position measuring device, characterized in that, The position measuring device includes: Downlink signal receiving unit, which is used to receive downlink signals from the base station; An uplink signal receiving unit, used to receive uplink signals from the terminal; and The control unit is configured to determine whether to perform the operation of detecting the uplink signal of the terminal and whether to perform the operation of sending the measurement signal obtained by measuring the uplink signal to the base station or location measurement server. Furthermore, the status of the location measuring device is determined based on whether the terminal sends an uplink signal for location measurement or whether the location measuring device successfully detects the uplink signal sent by the terminal. The location measuring device obtains the terminal's status change information from the base station or location measuring server.

7. The position measuring device according to claim 6, characterized in that, Also includes: A communication unit is used to receive state change information of the terminal.

8. The position measuring device according to claim 6, characterized in that, The control unit calculates the position of the terminal based on the measurement signal and the state of the position measuring device.

9. The position measuring device according to claim 8, characterized in that, The control unit displays the position of the position measuring device on a display connected to the position measuring device.

10. The position measuring device according to claim 6, characterized in that, The server is a location measurement server.

11. A method for configuring uplink signals of a terminal in a base station, characterized in that, The method includes: The steps of receiving an uplink signal setting request from a location measuring device or a server communicating with the location measuring device regarding a terminal in standby mode; The steps include generating a state change signal to indicate a state change of the inactive terminal, and generating a downlink signal to enable the terminal to send an uplink signal. The steps of sending the state change signal and the downlink signal to the terminal; The measured uplink signal is used to obtain the location of the terminal; and The step of sending the terminal's state change information and the uplink signal's channel setting information to the location measuring device or a server communicating with the location measuring device. The uplink signal is used to measure the uplink signal of the terminal in the location measuring device. The measured uplink signal is used to obtain the location of the terminal.

12. The method according to claim 11, characterized in that, Also includes: The step of sending the terminal's identification information to the server or location measurement device.

13. The method according to claim 11, characterized in that, Also includes: The step of receiving a link status information request signal from the location measuring device or the server for requesting link setting status information between the base station and the terminal; as well as The step of sending link setting status information between the base station and the terminal to the location measurement device or the server in response to the link status information request signal.

14. The method according to claim 11, characterized in that, The state change signal configures the terminal in standby mode to send uplink signals unchanged at the user interface of the terminal.

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