5G high-precision positioning method and device

Abstract

The present invention discloses a 5G high-precision positioning method and device, which uses an LMF network element to obtain data from a 5G base station for positioning calculation. The LMF network element stores a data encryption private key, and the 5G base station stores a matching data encryption public key. The LMF network element accesses a 5G base station with a TRP, and the LMF network element sends a TRP information request to the 5G base station. The 5G base station encrypts a TRP information response containing TRP location data and feeds it back to the LMF network element. The LMF network element decrypts the TRP information response to obtain the TRP location data; when there is a positioning demand, the LMF network element sends a positioning measurement request of the terminal to the 5G base station, and the 5G base station encrypts a positioning measurement response containing the positioning parameters of the terminal and feeds it back to the LMF network element. The LMF network element decrypts the positioning measurement response to obtain the positioning parameters. The 5G base station of the present invention encrypts the TRP location data and positioning parameters when transmitting them to the LMF network element, thereby protecting the security of the access network, protecting the security of the data, and preventing data from being stolen.

Description

Technical Field

[0001] The present invention relates to the field of 5G communications, and in particular to the design of high-precision positioning of terminals in 5G communications. Background Art

[0002] 5G high-precision positioning technology combines 5G networks with high-precision positioning algorithms. Leveraging the high speed, low latency, and large number of connections of 5G networks, combined with high-precision positioning algorithms, it enables seamless, high-precision location services both indoors and outdoors. This technology is crucial for providing high-precision, low-cost location services that bridge the "last mile" from outdoor to indoor locations.

[0003] In the 5G high-precision positioning technology, the corresponding UL-TDOA, UL-AoA and UL E-CID positioning technologies that are not available in 4G are introduced. The principle of these technologies is to use the TRP on the base station to measure the terminal signal, and combine the TRP position and test data to calculate the spatial position and global position of the terminal. In order to support these positioning technologies, the NRPPa protocol (NR Positioning Protocol A) for signaling and data transmission between the base station and the 5G positioning network element LMF is also introduced. According to the latest TS 3GPP 38455-i00, 38413-i00 and 38305-i00 protocols, in the high-precision positioning process, regardless of whether the positioning uses UL-TDOA, UL-AoA, UL E-CID or other positioning technologies, the NRPPa protocol that supports signaling and data transmission in the entire high-precision positioning process are all transmitted directly in plain text in the 5G core network and 5G access network. If the 5G core network and 5G access network equipment are not deployed in the same computer room, and the remote deployment method is commonly used, then the plain text transmission of NRPPa message data will have security risks and can be easily intercepted by the outside world and obtain the TRP information and terminal location information on each base station.

[0004] Therefore, there is an urgent need for a 5G high-precision positioning method and device that can solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a 5G high-precision positioning method and device, which can encrypt and transmit the TRP position data and positioning parameters transmitted by the 5G base station back to the 5G core network, protect the security of TRP data, protect the security of the access network, protect the security of terminal measurement data, and prevent them from being stolen.

[0006] In order to achieve the above-mentioned object, the present invention provides a 5G high-precision positioning method, comprising: after the LMF network element accesses a 5G base station with a TRP, it exchanges TRP information with the 5G base station to obtain TRP position data fed back by the 5G base station; upon receiving a positioning request from the terminal, the LMF network element exchanges positioning data with the 5G base station to obtain the positioning parameters of the terminal fed back by the 5G base station; the LMF calculates the position of the terminal based on the TRP position data and positioning parameters of the TRP in the 5G base station; The TRP information interaction between the LMF network element and the 5G base station with TRP specifically includes: storing a data encryption private key in the LMF network element, storing a data encryption public key matching the data encryption private key in the 5G base station, the LMF network element sending a TRP information request to the 5G base station, the 5G base station generating a TRP information response based on the TRP location data after receiving the TRP information request, encrypting the TRP information response based on the data encryption public key, the encrypted TRP information response including the encrypted TRP location data, feeding back the encrypted TRP information response to the LMF network element; the LMF network element decrypting the TRP information response based on the data encryption private key to obtain the TRP position data of the TRP; the LMF network element and the 5G base station perform positioning data interaction specifically including: when the LMF network element receives the positioning request of the terminal, the terminal sends the positioning measurement request to the TRP of the 5G base station; after receiving the positioning measurement request, the TRP of the 5G base station measures the positioning parameters corresponding to the terminal, generates a positioning measurement response based on the positioning parameters, encrypts the positioning measurement response based on the data encryption public key, the encrypted positioning measurement response includes the encrypted positioning parameters, and feeds back the positioning measurement response to the LMF network element; the LMF network element decrypts the positioning measurement response based on the data encryption private key to obtain the positioning parameters of the terminal.

[0007] Preferably, after the 5G base station with TRP accesses the 5G network, the LMF network element periodically exchanges TRP information with the 5G base station with TRP. When the LMF network element initially sends a TRP information request to the 5G base station, the TRP information request includes a data encryption public key that matches the data encryption private key stored in the LMF network element. The 5G base station saves the data encryption public key after initially obtaining the TRP information request including the data encryption public key. When the LMF network element periodically sends a TRP information request to the 5G base station subsequently, the TRP information request does not include the data encryption public key. Of course, the LMF network element may also not carry the data encryption public key in any TRP information request, but may pre-configure matching data encryption private keys and data encryption public keys in the LMF network element and the 5G base station respectively through other network elements or modules, or the LMF network element may send the data encryption public key to the 5G base station for storage separately before the TRP information request.

[0008] Preferably, after the 5G base station with TRP accesses the 5G network, the LMF network element periodically exchanges TRP information with the 5G base station with TRP. When the LMF network element initially sends a TRP information request to the 5G base station, the TRP information request includes a data encryption public key. After the 5G base station initially obtains the TRP information request including the data encryption public key, it saves the data encryption public key. When the LMF network element periodically sends a TRP information request to the 5G base station subsequently, the TRP information request does not include the data encryption public key.

[0009] Preferably, the TRP information response is encrypted using the elliptic curve signature algorithm in asymmetric encryption, and the positioning measurement response is encrypted using the elliptic curve signature algorithm in asymmetric encryption. Of course, the present invention can also use other encryption algorithms in asymmetric encryption.

[0010] Preferably, the LMF network element is communicatively connected to the 5G base station through the AMF network element.

[0011] Preferably, the 5G base station encrypts the entire message of the TRP information response based on the data encryption public key.

[0012] Preferably, the 5G base station encrypts the entire message of the positioning measurement response according to the data encryption public key.

[0013] Preferably, the 5G base station only encrypts the TRP location data in the TRP information response based on the data encryption public key, without encrypting the entire message.

[0014] Preferably, the 5G base station performs local data encryption on only the positioning parameters in the positioning measurement response according to the data encryption public key, without encrypting the entire message.

[0015] The present invention also provides a 5G high-precision positioning device, including an LMF network element, a 5G base station and an AMF network element, the 5G base station having a TRP, the LMF network element storing a data encryption private key, and the 5G base station storing a data encryption public key matching the data encryption private key; after the 5G base station with TRP accesses the 5G network, the LMF network element sends a TRP information request to the 5G base station; when the LMF network element receives the positioning request of the terminal, it sends the positioning measurement request of the terminal to the TRP of the 5G base station; after receiving the TRP information request, the 5G base station generates a TRP information response based on the TRP position data, encrypts the TRP information response based on the data encryption public key, and the encrypted TRP information response includes the encrypted TRP position data. The encrypted TRP information response is fed back to the LMF network element; after receiving the positioning measurement request, the TRP of the 5G base station measures the positioning parameters corresponding to the terminal, generates a positioning measurement response according to the positioning parameters, encrypts the positioning measurement response according to the data encryption public key, the encrypted positioning measurement response includes the encrypted positioning parameters, and feeds back the positioning measurement response to the LMF network element; the LMF network element also decrypts the TRP information response and the positioning measurement response according to the data encryption private key to obtain the TRP position data and the positioning parameters of the terminal, calculates the position signal of the terminal according to the TRP position data and positioning parameters of the TRP in the 5G base station, and calculates the position of the terminal according to the TRP position data and positioning parameters of the TRP in the 5G base station.

[0016] Preferably, after the 5G base station with TRP accesses the 5G network, the LMF network element periodically exchanges TRP information with the 5G base station with TRP, and when the LMF network element initially sends a TRP information request to the 5G base station, the TRP information request includes a data encryption public key that matches the data encryption private key stored in itself, and the 5G base station saves the data encryption public key after initially obtaining the TRP information request containing the data encryption public key; when the LMF network element subsequently periodically sends a TRP information request to the 5G base station, the TRP information request does not include the data encryption public key. Of course, the LMF network element may also not carry the data encryption public key in any TRP information request, but may pre-configure matching data encryption private keys and data encryption public keys in the LMF network element and the 5G base station respectively through other network elements or modules, or the LMF network element may separately send the data encryption public key to the 5G base station for storage before the TRP information request.

[0017] Preferably, the 5G base station encrypts the entire message of the TRP information response based on the data encryption public key.

[0018] Preferably, the 5G base station encrypts the entire message of the positioning measurement response according to the data encryption public key.

[0019] Preferably, the 5G base station only performs local data encryption on the TRP location data in the TRP information response based on the data encryption public key.

[0020] Preferably, the 5G base station only performs local data encryption on the positioning parameters in the positioning measurement response based on the data encryption public key.

[0021] Preferably, the TRP information response is encrypted using the elliptic curve signature algorithm in asymmetric encryption, and the positioning measurement response is encrypted using the elliptic curve signature algorithm in asymmetric encryption. Of course, the present invention can also use other encryption algorithms in asymmetric encryption.

[0022] Preferably, the LMF network element is communicatively connected to the 5G base station through the AMF network element.

[0023] Compared with the prior art, in the present invention, after a 5G base station with TRP accesses the 5G network, the LMF network element sends a TRP information request containing a data encryption public key to the 5G base station through the AMF network element, and the LMF network element sends a TRP information request and a positioning measurement request to the 5G base station, so that when the 5G base station feeds back a TRP information response and a positioning measurement response, the 5G base station needs to encrypt the positioning measurement response and the positioning measurement response according to the data encryption public key, thereby encrypting the TRP location data and positioning parameters transmitted back to the 5G core network by the 5G base station, protecting the security of the TRP data in the NRPPa message, protecting the security of the access network, protecting the security of the terminal measurement data, and preventing it from being stolen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the 5G high-precision positioning device of the present invention.

[0025] Figure 2 It is a flow chart of the 5G high-precision positioning method of the present invention.

[0026] Figure 3 It is a specific flow chart of step 100 in the 5G high-precision positioning method of the present invention.

[0027] Figure 4 This is a specific flow chart of step 200 in the 5G high-precision positioning method of the present invention. DETAILED DESCRIPTION

[0028] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0029] refer to Figure 1 The present invention provides a 5G high-precision positioning device for obtaining the positioning of a terminal (UE) using a 5G network, including an LMF network element 10, a 5G base station 20 and an AMF network element 30. The 5G base station 20 (gNB) has a TRP21 (Transmission-Reception Point). The LMF network element 10 stores a data encryption private key, and the 5G base station 20 stores a data encryption public key matching the data encryption private key.

[0030] Among them, a 5G base station 20 can have zero to multiple TRP21s, and TRP21 is used to locate the terminal.

[0031] The 5G high-precision positioning device includes a 5G core network and a 5G access network. The 5G access network is used to communicate with terminals and provide the terminals with the network services of the 5G core network. The 5G core network includes LMF network element 10, AMF network element 30, GMLC network element, and NEF network element. LMF network element 10 (Location Management Function) is a location management function, AMF network element 30 (Access and Mobility Management Function) is an access and mobility management function, GMLC is a gateway mobile location center, and NEF network element (Network Exposure Function) is a network exposure function. External servers can use this network element to access network elements within the core network or request corresponding services within the core network. 5G base station (gNB), next generation node B.

[0032] Among them, the 5G core network and the 5G access network transmit messages through the NRPPa protocol. The NRPPa protocol is carried by the AMF network element 30 and the LMF network element 10 using the http2 protocol message, which has a security encryption function. Different from the prior art in which the AMF network element 30 and the 5G base station 20 use the plaintext NGAP protocol message, the AMF network element 30 and the 5G base station 20 in this application use the asymmetric encrypted NRPPa protocol, wherein the messages sent by the AMF network element 30 to the 5G base station 20 do not need to be encrypted, and the messages sent by the 5G base station 20 to the LMF network element 10 and containing key data need to be encrypted using an asymmetric encryption method. The key data includes the spatial position and wireless characteristics of the TRP21, the location parameters of the base station collected by the TRP21, etc. The location parameters can be the wireless angle between the 5G base station 20 and the terminal, or the round-trip time of the wireless information between the 5G base station 20 and the terminal, depending on the currently used positioning technology. If UL-TDOA positioning technology is used, the positioning parameters include the time for the wireless information to travel back and forth between the 5G base station 20 and the terminal. If UL-AoA positioning technology is used, the positioning parameters include the wireless angle between the 5G base station 20 and the terminal.

[0033] Among them, after the 5G base station 20 with TRP21 accesses the 5G network, the LMF network element 10 sends a TRP information request to the 5G base station 20; when the LMF network element 10 receives the terminal's positioning request, it sends the terminal's positioning measurement request to the TRP21 of the 5G base station 20.

[0034] After receiving the TRP information request, the 5G base station 20 generates a TRP information response based on the TRP location data, encrypts the TRP information response based on the data encryption public key, the encrypted TRP information response includes the encrypted TRP location data, and feeds back the encrypted TRP information response to the LMF network element 10.

[0035] After receiving the positioning measurement request, the TRP21 of the 5G base station 20 measures the positioning parameters corresponding to the terminal, generates a positioning measurement response based on the positioning parameters, encrypts the positioning measurement response based on the data encryption public key, the encrypted positioning measurement response includes the encrypted positioning parameters, and feeds back the positioning measurement response to the LMF network element 10.

[0036] The LMF network element 10 also decrypts the TRP information response and the positioning measurement response based on the data encryption private key to obtain the TRP position data and the positioning parameters of the terminal, calculates the position signal of the terminal based on the TRP position data and positioning parameters of TRP21 in the 5G base station 20, and calculates the position of the terminal based on the TRP position data and positioning parameters of TRP21 in the 5G base station 20.

[0037] Among them, the LMF network element 10 is communicatively connected to the 5G base station 20 through the AMF network element 30.

[0038] The 5G high-precision positioning device is used to perform a 5G high-precision positioning method. Figure 2 , the 5G high-precision positioning method includes steps 100 to 300.

[0039] In step 100, after accessing a 5G base station 20 having a TRP 21, the LMF network element 10 exchanges TRP information with the 5G base station 20 to obtain TRP location data fed back by the 5G base station 20. Specifically, in step 100, the LMF network element 10 obtains the encrypted TRP location data of multiple TRPs 21 sent by the 5G base station 20, and then the LMF network element 10 decrypts the TRP location data of multiple TRPs 21.

[0040] In step 200, upon receiving a positioning request from a terminal, the LMF network element 10 exchanges positioning data with the 5G base station 20 to obtain the terminal positioning parameters fed back by the 5G base station 20. Specifically, in step 200, the LMF network element 10 obtains the encrypted terminal positioning parameters measured by multiple TRPs and fed back by the 5G base station 20, and then the LMF network element 10 decrypts the terminal positioning parameters measured by multiple TRPs 21.

[0041] In step 300 , the LMF network element 10 calculates the position of the terminal based on the TRP position data of the plurality of TRPs 21 and the positioning parameters of the terminal measured by the plurality of TRPs 21 .

[0042] refer to Figure 3 , step 100 specifically includes steps S11 to S15.

[0043] S11. After the LMF network element 10 accesses the 5G base station 20 with TRP21, it sends a TRP information request to the 5G base station 20.

[0044] Among them, the LMF network element 10 sends the TRP information request to the AMF network element 30, and the AMF network element 30 sends the TRP information request to the 5G base station 20.

[0045] S12. After receiving the TRP information request, the 5G base station 20 generates a TRP information response based on the TRP location data.

[0046] S13. The 5G base station 20 encrypts the TRP information response based on the data encryption public key, and the encrypted TRP information response includes encrypted TRP location data.

[0047] In the first embodiment, the 5G base station 20 encrypts the entire message of the TRP information response according to the data encryption public key. This solution is to fully encrypt the entire message of the TRP information response.

[0048] In the second embodiment, the 5G base station 20 only performs local data encryption on the TRP location data in the TRP information response based on the data encryption public key. This scheme realizes local encryption of core data without encrypting the entire message.

[0049] S14. The 5G base station 20 feeds back the encrypted TRP information response to the LMF network element 10.

[0050] Among them, the 5G base station 20 feeds back the encrypted TRP information response to the AMF network element 30, and the AMF network element 30 feeds back the encrypted TRP information response to the LMF network element 10.

[0051] S15. The LMF network element 10 decrypts the TRP information response based on the data encryption private key to obtain the TRP location data of the TRP21.

[0052] In this embodiment, after the 5G base station 20 with TRP21 accesses the 5G network, the LMF network element 10 periodically exchanges TRP information with the 5G base station 20 with TRP21 to execute the above-mentioned steps S11 to S15. Specifically, when the LMF network element 10 initially sends a TRP information request to the 5G base station 20, the TRP information request includes a data encryption public key that matches the data encryption private key stored in the 5G base station 20. After the 5G base station 20 initially obtains the TRP information request including the data encryption public key, it saves the data encryption public key. When the LMF network element 10 periodically sends a TRP information request to the 5G base station 20 subsequently, the TRP information request does not include the data encryption public key. Of course, the LMF network element 10 may also not carry the data encryption public key in any TRP information request, but instead pre-configure matching data encryption private keys and data encryption public keys in the LMF network element 10 and the 5G base station 20 through other network elements or modules, or the LMF network element 10 may send the data encryption public key to the 5G base station 20 for storage separately before the TRP information request.

[0053] Preferably, the 5G base station 20 with TRP21, when interacting with the LMF network element 10 for TRP information, also communicates with the terminal to prepare wireless resources to facilitate subsequent signal measurement of the terminal. Specifically, the 5G base station 20 prepares the measured wireless resources for the corresponding terminal, and when the LMF initiates the NRPPa positioning activation request, it activates the wireless resources of the corresponding terminal and feeds back the positioning activation result to the LMF network element 10.

[0054] Among them, after the 5G base station 20 with TRP21 accesses the 5G network, the LMF network element 10 periodically interacts with the 5G base station 20 with TRP21 through TRP information. When the LMF network element 10 initially sends a TRP information request to the 5G base station 20, the TRP information request includes a data encryption public key. The 5G base station 20 saves the data encryption public key after initially obtaining the TRP information request including the data encryption public key. When the LMF network element 10 periodically sends a TRP information request to the 5G base station 20 subsequently, the TRP information request does not include the data encryption public key.

[0055] refer to Figure 4 , step 200 specifically includes steps S21 to S26.

[0056] S21. When the LMF network element 10 receives the positioning request of the terminal, it sends the positioning measurement request of the terminal to the TRP21 of the 5G base station 20.

[0057] Among them, the LMF network element 10 sends the terminal's positioning measurement request to the AMF network element 30, and the AMF network element 30 sends the terminal's positioning measurement request to TRP21 of the 5G base station 20.

[0058] Among them, the LMF network element 10 sends the terminal's positioning measurement request to multiple TRP21s, which can be the TRP21 of one 5G base station 20 or the TRP21 of multiple 5G base stations 20.

[0059] S22. After receiving the positioning measurement request, the TRP21 of the 5G base station 20 measures the positioning parameters corresponding to the terminal.

[0060] S23. The 5G base station 20 generates a positioning measurement response based on the positioning parameters.

[0061] S24. The 5G base station 20 encrypts the positioning measurement response according to the data encryption public key, where the encrypted positioning measurement response includes encrypted positioning parameters.

[0062] In the first embodiment, the 5G base station 20 encrypts the entire message of the positioning measurement response according to the data encryption public key. This solution is to fully encrypt the entire message of the positioning measurement response.

[0063] In a second embodiment, the 5G base station 20 performs partial data encryption on only the positioning parameters in the positioning measurement response according to the data encryption public key. This solution implements partial encryption of core data without encrypting the entire message.

[0064] S25. The 5G base station 20 feeds back the encrypted positioning measurement response to the LMF network element 10.

[0065] Among them, the 5G base station 20 feeds back the encrypted positioning measurement response to the AMF network element 30, and the AMF network element 30 feeds back the encrypted positioning measurement response to the LMF network element 10.

[0066] S26. The LMF network element 10 decrypts the positioning measurement response according to the data encryption private key to obtain the positioning parameters of the terminal.

[0067] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A 5G high-precision positioning method, characterized by: include: After accessing a 5G base station with a TRP, the LMF network element interacts with the 5G base station for TRP information to obtain TRP location data fed back by the 5G base station. Upon receiving a positioning request from a terminal, the LMF network element interacts with the 5G base station for positioning data to obtain positioning parameters of the terminal fed back by the 5G base station, and calculates the location of the terminal based on the TRP location data and positioning parameters of the TRP in the 5G base station. The LMF network element and the 5G base station having the TRP perform TRP information interaction specifically including: storing a data encryption private key in the LMF network element, storing a data encryption public key matching the data encryption private key in the 5G base station, the LMF network element sending a TRP information request to the 5G base station, the 5G base station generating a TRP information response based on the TRP location data after receiving the TRP information request, encrypting the TRP information response based on the data encryption public key, the encrypted TRP information response including the encrypted TRP location data, and feeding back the encrypted TRP information response to the LMF network element; the LMF network element decrypting the TRP information response based on the data encryption private key to obtain the TRP location data of the TRP; The LMF network element and the 5G base station interact with the positioning data specifically including: when the LMF network element receives the positioning request of the terminal, the terminal sends the positioning measurement request to the TRP of the 5G base station; after receiving the positioning measurement request, the TRP of the 5G base station measures the positioning parameters corresponding to the terminal, generates a positioning measurement response based on the positioning parameters, encrypts the positioning measurement response based on the data encryption public key, the encrypted positioning measurement response includes the encrypted positioning parameters, and feeds back the positioning measurement response to the LMF network element; the LMF network element decrypts the positioning measurement response based on the data encryption private key to obtain the positioning parameters of the terminal.

2. The 5G high-precision positioning method according to claim 1, wherein: After the 5G base station with TRP accesses the 5G network, the LMF network element periodically exchanges TRP information with the 5G base station with TRP. When the LMF network element initially sends a TRP information request to the 5G base station, the TRP information request includes a data encryption public key that matches its own stored data encryption private key. The 5G base station saves the data encryption public key after initially obtaining the TRP information request including the data encryption public key. When the LMF network element periodically sends a TRP information request to the 5G base station subsequently, the TRP information request does not include the data encryption public key.

3. The 5G high-precision positioning method according to claim 1, wherein: The TRP information response is encrypted using the elliptic curve signature algorithm in asymmetric encryption, and the positioning measurement response is encrypted using the elliptic curve signature algorithm in asymmetric encryption.

4. The 5G high-precision positioning method according to claim 1, wherein: The LMF network element is connected to the 5G base station through the AMF network element.

5. The 5G high-precision positioning method according to claim 1, wherein: The 5G base station encrypts the entire message of the TRP information response according to the data encryption public key or encrypts only the TRP location data in the TRP information response according to the data encryption public key; The 5G base station encrypts the entire message of the positioning measurement response according to the data encryption public key, or only performs partial data encryption on the positioning parameters in the positioning measurement response according to the data encryption public key.

6. A 5G high-precision positioning device, characterized by: It includes an LMF network element, a 5G base station and an AMF network element, the 5G base station has a TRP, the LMF network element stores a data encryption private key, and the 5G base station stores a data encryption public key matching the data encryption private key; After the 5G base station with TRP accesses the 5G network, the LMF network element sends a TRP information request to the 5G base station; when the LMF network element receives the terminal's positioning request, it sends the terminal's positioning measurement request to the TRP of the 5G base station; After receiving the TRP information request, the 5G base station generates a TRP information response based on the TRP location data, encrypts the TRP information response based on the data encryption public key, the encrypted TRP information response includes the encrypted TRP location data, and feeds back the encrypted TRP information response to the LMF network element; after receiving the positioning measurement request, the TRP of the 5G base station measures the positioning parameters corresponding to the terminal, generates a positioning measurement response based on the positioning parameters, encrypts the positioning measurement response based on the data encryption public key, the encrypted positioning measurement response includes the encrypted positioning parameters, and feeds back the positioning measurement response to the LMF network element; The LMF network element also decrypts the TRP information response and the positioning measurement response based on the data encryption private key to obtain the TRP position data and the positioning parameters of the terminal, calculates the position signal of the terminal based on the TRP position data and positioning parameters of the TRP in the 5G base station, and calculates the position of the terminal based on the TRP position data and positioning parameters of the TRP in the 5G base station.

7. The 5G high-precision positioning device according to claim 6, wherein: After the 5G base station with TRP accesses the 5G network, the LMF network element periodically interacts with the 5G base station with TRP through TRP information. When the LMF network element initially sends a TRP information request to the 5G base station, the TRP information request includes a data encryption public key that matches its own stored data encryption private key. After the 5G base station initially obtains the TRP information request including the data encryption public key, it saves the data encryption public key. When the LMF network element periodically sends a TRP information request to the 5G base station subsequently, the TRP information request does not include the data encryption public key.

8. The 5G high-precision positioning device according to claim 6, wherein: The 5G base station encrypts the entire message of the TRP information response according to the data encryption public key or encrypts only the TRP location data in the TRP information response according to the data encryption public key; The 5G base station encrypts the entire message of the positioning measurement response according to the data encryption public key, or only performs partial data encryption on the positioning parameters in the positioning measurement response according to the data encryption public key.

9. The 5G high-precision positioning device according to claim 6, wherein: The 5G base station uses the elliptic curve signature algorithm in asymmetric encryption to encrypt the TRP information response, and the 5G base station uses the elliptic curve signature algorithm in asymmetric encryption to encrypt the positioning measurement response.

10. The 5G high-precision positioning device according to claim 6, wherein: The LMF network element is connected to the 5G base station through the AMF network element.

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