CN115134744A

CN115134744A - High-precision carrier positioning method based on 5G transmission power control

Info

Publication number: CN115134744A
Application number: CN202210591559.0A
Authority: CN
Inventors: 赵雪; 陈勇为; 杜笑笑
Original assignee: Beijing Yuansi Jiuwei Technology Co ltd
Current assignee: Beijing Yuansi Jiuwei Technology Co ltd
Priority date: 2022-05-28
Filing date: 2022-05-28
Publication date: 2022-09-30

Abstract

The invention discloses a high-precision carrier positioning method based on 5G transmission power control, which comprises the following steps: s1: the user terminal equipment establishes connection with a network positioning server through a 5G base station in a target cell to complete initialization information configuration, and then the 5G base station transmits a downlink 5G NR signal to support the user terminal equipment to obtain a position service request; s2: the method comprises the steps that user terminal equipment receives a positioning reference signal and captures a 5G NR signal, after initialization information is obtained, relevant data and configuration information required by positioning are obtained through a tracking loop, a first power control parameter is determined based on first receiving power of the user terminal equipment and the transmission condition of expected positioning data, and system resources required to be allocated for current positioning and required transmission power for transmitting SRS to base station equipment are determined at least based on the first power control parameter; s3: and carrying out multiple interactions between the user terminal equipment and the 5G base station, and carrying out position calculation to obtain accurate position information of the user terminal equipment.

Description

High-precision carrier positioning method based on 5G transmission power control

Technical Field

The invention relates to the technical field of wireless communication positioning, in particular to a high-precision carrier positioning method based on 5G transmission power control.

Background

With the continuous development of wireless mobile communication technology and position service application requirements, researchers and relevant equipment manufacturers at home and abroad increasingly realize the market potential of realizing high-precision positioning in special scenes such as indoors, underground and the like by using a wireless mobile communication network. The international standards organization 3GPP (3rd generation partnership project) in 2016 has specified that the 5G network standard will support high-precision positioning capability, and in the Release 17 standard frozen in 2022 and the newly released Release 18 standard, more specifically, for different application scenarios, increasingly strict requirements are put forward on positioning accuracy, availability, power consumption, and the like of the 5G mobile communication network, taking the internet of things as an example, and it is expected that the positioning accuracy of 0.2 meter in 99% cases is provided in the scenario.

Because the 4G and previous wireless mobile communication networks focus on communication characteristics more and are generally performed in positioning, the terminal positioning currently uses a GNSS method more, but with the arrival of the 5G era, the function of positioning in the 5G standard is fully supplemented, and compared with a GNSS satellite positioning system, the positioning using the 5GNR system has the following advantages:

the receiving power of the NR carrier positioning reference signal is much stronger than that of the GNSS carrier positioning reference signal, the target receiving power of the GNSS on the entire carrier frequency bandwidth is usually designed to be more than-130 dBm, the power of the 5GNR reference signal is not less than-100 dBm, and the power of the NR reference signal is much stronger than that of the GNSS signal, which is more beneficial for a receiver at a receiving end to lock the positioning signal. The wireless base stations are typically stationary on the ground without consideration of complex mechanisms for determining the positions of the satellites and the phase centers of the antennas of the global navigation satellite system. The user cannot control the transmission mode of the GNSS signals, i.e., cannot control the configuration of the transmission frequency, the transmission power, and the like. Unlike GNSS, one of the advantages of 5GNR positioning is that the network may actually control the transmission of NR signals.

However, at the present stage, only the 5G related standards are preliminarily formulated and completed, and the long process is needed for actual deployment in engineering to realize and subsequent large-scale popularization and application. In the 5GNR positioning at the present stage, conventional methods such as fingerprint matching and phase measurement are adopted, the positioning performance of such positioning methods is greatly uncertain due to factors such as base station density, cell edge, multipath environment and the like, and even positioning in the same cell shows a large difference, so that research on 5GNR positioning has a large application prospect and also has a large challenge, and therefore, a problem to be solved in the present stage is to seek a novel positioning method or a novel positioning system.

Disclosure of Invention

The invention aims to provide a high-precision carrier positioning method based on 5G transmission power control, which transmits a positioning reference signal through a 5G base station, dynamically controls the transmission power by adjusting configuration parameters in the transmission process of a 5G NR signal, and ensures the high-efficiency transmission of the positioning reference signal to the maximum extent under the condition of not influencing the communication performance.

In order to achieve the above object, the present invention provides a high-precision carrier positioning method based on 5G transmission power control, which mainly comprises the following steps;

(1) the user terminal equipment establishes connection with a network positioning server through a 5G base station in a target cell to complete initialization information configuration, and then the 5G base station transmits a downlink 5GNR signal to support the user terminal equipment to obtain a position service request.

The user terminal device generally refers to any electronic device that can receive the 5G NR signal for positioning, and may also be referred to as a communication device, a User Equipment (UE), a Subscriber Station (SS), an Unmanned Aerial Vehicle (UAV), a portable subscriber station, a Mobile Station (MS), or an Access Terminal (AT);

user end devices may include, but are not limited to, mobile phones, cellular phones, smart phones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable end devices, Personal Digital Assistants (PDAs), portable computers, desktop computers, image capture end devices such as digital cameras, gaming end devices, music storage and playback devices, in-vehicle wireless end devices, wireless endpoints, mobile stations, laptop embedded devices, laptop installed devices, USB dongles, smart devices, wireless Customer Premises Equipment (CPE), internet of things devices, watches or other wearable devices, Head Mounted Displays (HMD), vehicles, drones, medical devices and applications, industrial devices and applications, consumer electronics, and so forth.

The target cell comprises a service cell where the user terminal equipment is located and one or more adjacent cells; the 5G base station comprises a gNB under an independent networking (SA) and a ng-eNB or an en-gNB under a non-independent Networking (NSA); wherein, the gNB is a 5G base station which is in butt joint with a 5G core network under independent networking; under the NSA networking architecture of the ng-eNB in the Option4 series, the 4G base station needs to be upgraded to support the enhanced LTE and is in butt joint with a 5G core network, and the upgraded 4G base station is the ng-eNB; the en-gNB is a 5G base station which is in butt joint with a 4G core network under the NSA networking architecture of the Option3 series.

The 5G NR signal should also contain data and configuration information related to the positioning process on the premise of ensuring the 5G high-rate communication rate service.

Further, in terms of positioning, the 5G NR signal is mainly a Positioning Reference Signal (PRS), the PRS may be a pure carrier sinusoidal signal, and the carrier frequency thereof is a pre-configured or pre-defined carrier frequency, and a positioning reference signal modulated by a random sequence may also be considered.

Wherein, 5GNR PRS is different from 4G LTE PRS, and 5G NR positioning reference signal is enhanced as follows:

1) the interval of resource units for mapping PRS signals in the 5G network can be as small as 2 subcarriers, and PRS signals in the LTE network only support a comb structure with the resource unit frequency interval of 6 subcarriers, so that the frequency spectrum resources occupied by the 5G PRS signals under the same bandwidth can reach 3 times of those occupied by the 4G PRS signals, and the anti-interference capability of the 5G PRS is obviously improved;

2) in the aspect of time resources, the 5G PRS signals can occupy 12 continuous symbols, while the 4G PRS signals can only be mapped on 7 symbols in one subframe (total 14 symbols), so that the sequence length of the PRS signals is greatly increased by 5G, the anti-noise capability is improved, the signal broadcasting time is also prolonged, and a foundation is laid for tracking the signals;

3) the 5G PRS signal also shortens a cycle interval, and can support the cycle continuous broadcasting of the PRS signal, and a minimum of 4 subframes are needed to be arranged between the front and back two periods of the PRS signal of the LTE network;

4) the 5G PRS signal increases the configuration function of power, while the 4G PRS signal can only be broadcasted with the same power as the communication signal, and the 5G PRS signal can support the PRS signal to be embedded in the background noise of the communication signal with extremely low power, so that the same-frequency common-carrier of the communication and the positioning signal can be realized, and the continuous broadcasting of the positioning signal can be carried out without affecting the communication capability.

The user terminal equipment needs to support 5G signals and can interact with a 5G base station to calculate the position.

The base station transmitter at least determines a sending beam for sending the positioning reference signal, carries out beam forming on the sending beam according to the direction of the appointed beam, and sends at least one positioning reference signal to the user terminal equipment by utilizing the formed sending beam.

(2) The user terminal equipment acquires the 5G NR signal, acquires relevant data and configuration information required by positioning through a tracking loop after acquiring initialization information, determines a first power control parameter based on first receiving power of the user terminal equipment and the transmission condition of expected positioning data, and determines system resources required to be allocated for current positioning and required transmission power for transmitting SRS to the base station equipment based on at least the first power control parameter.

In the process of receiving the positioning reference signal by the user terminal equipment, the 5G signal transmitted by the base station is firstly captured, and the purpose of the capturing stage is to determine the 5G base stations near the receiver and roughly estimate the corresponding start time and doppler frequency. To this end, after acquiring the carrier frequencies of the surrounding gNB, the ue starts sampling the 5G signal at least a sufficient sampling rate to acquire the entire SSB/PBCH bandwidth and converts the signal to the baseband domain by removing the carrier frequency, then searches for and acquires the start time and doppler frequency of the current positioning operation, and after obtaining initial rough estimates of the start time and doppler frequency, the ue refines and maintains these estimates through a tracking loop.

For the acquisition of the 5G NR signal, the user terminal equipment at least determines a transmitting beam of a received PRS, carries out beam forming on the receiving beam according to a specified beam direction, and receives at least one PRS signal by utilizing the formed receiving beam.

Further, the positioning configuration should at least include the following indication information: target device information required to transmit a positioning reference signal, and resource information allocated for transmitting the positioning reference signal to the target device; and determining a first power control parameter based on a first received power of the user terminal device and the transmission of expected positioning data; determining system resources required to be allocated for current positioning and required transmission power for transmitting the SRS to the base station equipment at least based on the first power control parameter;

the transmit power of the positioning signal is one of the important aspects that needs to be tightly controlled in order to meet high requirements between devices such as power consumption, complexity, etc. and network efficiency such as signaling overhead, latency, scalability, etc.

The transmit power for signal transmission by the terminal device may be controlled by its serving network equipment, such as the gbb. For example, if the terminal device is to transmit SRS to its serving network device, the serving network device may configure the terminal device via Radio Resource Control (RRC) signaling with power control parameters and reference signals for path loss measurements. The terminal device may determine a transmit power for transmitting the SRS to the network device based on the power control parameter and a path loss estimate derived by measuring configured reference signals transmitted from the serving network device.

However, in case of a user terminal device towards one or more neighbouring network devices with which the user terminal device has no data connection established, it is difficult for the serving network device to properly control the transmit power used by the user terminal device for towards the respective neighbouring network device. In particular, in order to control transmit power to neighboring network devices, the serving network device may have to predict appropriate power control parameters for one or more neighboring network devices or one or more appropriate receive beams to be used by the neighboring network devices in order to determine appropriate reference signals transmitted by the neighboring network devices for path loss measurements.

In addition, determining power control parameters and receive beams for neighboring network devices may result in complex negotiation procedures between the serving network device, the user terminal device, the neighboring network devices, and the network location server, resulting in a large amount of signaling overhead between these devices and additional measurement and processing operations performed by these devices.

(3) And carrying out multiple interactions between the user terminal equipment and the 5G base station, and carrying out position calculation to obtain accurate position information of the user terminal equipment.

The user terminal equipment measures the downlink reference signal to obtain the sending and receiving time difference; the method comprises the steps that a base station measuring unit captures an uplink reference signal, measures and sends a receiving time difference, summarizes the uplink reference signal to a positioning server, obtains required position information through multiple interactive solution, and uses a 5G NR Multi-cell RTT positioning technology in multiple interaction of a network positioning server and user terminal equipment through a 5G base station.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the invention relates to a high-precision carrier positioning method based on 5G transmission power control, which is characterized in that after user terminal equipment obtains initialization information, a tracking loop is used for obtaining required positioning data, and the transmission power is dynamically controlled by adjusting configuration parameters, so that the high-efficiency transmission of positioning reference signals is ensured to the maximum extent; and finally, the user terminal equipment interacts with the 5G base station for many times, so that position calculation is carried out, and accurate position information is obtained. According to the invention, the transmission power is controlled by dynamically adjusting the configuration parameters while the 5G high-speed communication service capability is not influenced, so that the positioning reference signal can be efficiently transmitted, and the positioning capability of the 5G NR system is further improved;

2. according to the high-precision carrier positioning method based on 5G transmission power control, each time of transmission power is accurately controlled in the 5G NR multiple position service interaction process, the positioning reference signal is ensured to be in the optimal transmission state, the positioning precision is improved, meanwhile, the loss of a transmitting end can be reduced to the greatest extent, and system resources are saved;

drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic diagram of a network architecture applicable in embodiments of the present invention;

fig. 2 is a flowchart of a high-precision carrier positioning method based on 5G transmission power control according to an embodiment of the present invention;

fig. 3 is a flowchart of transmission power control provided in an embodiment of the present invention;

fig. 4 is a flowchart of a method for implementing transmission power control according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Examples

Referring to fig. 1 to fig. 3, a high-precision carrier positioning method based on 5G transmission power control is provided in this embodiment, wherein:

the number of positioning devices, the number of positioning links, and the number of other elements shown in fig. 1 are for illustration purposes only and are not meant to imply any limitations. The location network environment may include only homogeneous location network deployments or only heterogeneous location network deployments.

In a positioning environment, the positioning environment is divided into a Downlink (DL) and an Uplink (UL), in the DL, a 5G base station is a transmitting device, and a user terminal device is a receiving device; in the UL, the 5G base station device is a receiving device, and the user terminal device is a transmitting device;

a high-precision carrier positioning method based on 5G transmission power control comprises the following specific steps:

(1) the user terminal equipment establishes connection with a network positioning server through a 5G base station in a target cell to complete initialization information configuration, and then the 5G base station transmits a downlink 5G NR signal to support the user terminal equipment to obtain a position service request;

(2) user terminal equipment captures the 5G NR signal, and after initialization information is obtained, related data and configuration information required by positioning are obtained through a tracking loop; and determining a first power control parameter based on a first received power of the user terminal device and the transmission of expected positioning data; the allocated system resources required for the current positioning and the required transmission power for transmitting the SRS to the base station apparatus are determined based on at least the first power control parameter.

Specifically, for the control of the transmission power, the specific steps are as follows:

1) in the transmission process of the 5G NR signal, analyzing the 5G NR signal to obtain a 5G NR downlink frame header position and uplink resource allocation information of 5G user terminal equipment;

2) the resource allocation information of the 5G user terminal equipment at least comprises the time-frequency resource position occupied by the PUSCH of the 5G user terminal equipment, the length and the configuration parameters of the PUSCH DMRS;

4) performing time-frequency transformation on the PUSCH time domain signal of the uplink wireless signal to obtain a target PUSCH time-frequency resource grid;

and the target PUSCH time-frequency resource grid is obtained by carrying out fast Fourier transform on a PUSCH time-domain signal of the uplink wireless signal according to the configured subframe length.

5) Setting the size of a frequency domain window, sliding according to the size of the frequency domain window, and extracting a PUSCH DMRS window block containing a target signal from a target PUSCH time-frequency resource grid to obtain a plurality of PUSCH DMRS window blocks;

the method comprises the following steps of:

calculating the symbol position, the frequency domain initial position S and the frequency domain length LEN of the PUSCH DMRS according to the time-frequency resource occupied by the PUSCH and the configuration parameters of the PUSCH DMRS analyzed from the downlink wireless signal;

setting the size of a frequency domain window according to the deduced symbol position, frequency domain initial position S and frequency domain length LEN of the PUSCH DMRS;

and extracting a plurality of PUSCH DMRS window blocks from the target PUSCH time-frequency resource grid according to the set frequency domain window size.

6) Calculating a channel estimation value H1 of each PUSCH DMRS window block in a frequency domain search window;

the calculating the channel estimation value H1 of each PUSCH DMRS window block in the frequency domain search window comprises:

generating a local PUSCH DMRS signal according to the configuration parameters of the PUSCH DMRS of the 5G user terminal equipment analyzed from the 5G NR signal and the 3GPP physical layer protocol specification;

and dividing each PUSCH DMRS window block by the local PUSCH DMRS signal to obtain a channel estimation value H1 of each PUSCH DMRS window block in the frequency domain search window.

7) Carrying out frequency offset correction and time offset correction on the channel estimation value H1 to obtain a corrected channel estimation value H2;

the performing frequency offset correction and time offset correction on the channel estimation value H1 to obtain a corrected channel estimation value H2 includes:

for any PUSCH DMRS window block, calculating the frequency offset real part and imaginary part values of any PUSCH DMRS window block on any symbol;

calculating the frequency offset value between the carriers corresponding to any one PUSCH DMRS window block on any one symbol according to the real part and the imaginary part of the frequency offset;

according to the frequency offset value among the carriers, carrying out frequency offset correction on any PUSCH DMRS window block to obtain a channel estimation value Hf after the frequency offset correction of any PUSCH DMRS window block on any symbol;

calculating a corresponding time offset value according to the channel estimation value Hf after the frequency offset correction of any PUSCH DMRS window block on any symbol;

and according to the time offset value, performing time offset correction on the corresponding channel estimation value Hf after the frequency offset correction to obtain a channel estimation value H2 after the time offset correction.

8) Based on the position of the 5G NR downlink frame header, the position and length of time-frequency resources occupied by the PUSCH of the 5G user terminal equipment and the configuration parameters of the PUSCH DMRS, calculating the power value of the 5G user terminal equipment according to the channel estimation value H2 corrected by each PUSCH DMRS window block, wherein the calculated power value of the 5G user terminal equipment is the uplink power of the 5G user terminal equipment, which needs to be transmitted;

for a plurality of time offset corrected channel estimation values H2 corresponding to any PUSCH DMRS window block on different symbols, carrying out square summation on the plurality of time offset corrected channel estimation values H2 to obtain a correlation value of any PUSCH DMRS window block;

calculating a correlation value of each PUSCH DMRS window block to obtain a plurality of correlation values;

acquiring a frequency domain index value where a target PUSCH DMRS (physical uplink shared channel) corresponding to the maximum correlation value in the multiple correlation values is located, wherein the maximum correlation value is a correlation value peak value, and calculating a power value of the 5G user terminal equipment according to the correlation value peak value;

and removing the correlation value peak values of the plurality of correlation values, then obtaining an average value to obtain a noise value, and calculating the signal-to-noise ratio of the 5G user terminal equipment according to the correlation value peak values and the noise value.

After the obtaining of the frequency domain index value of the target PUSCH DMRS corresponding to the maximum correlation value, the method further comprises:

performing correlation calculation on the uplink wireless signal in a frequency domain window to obtain energy, a signal-to-noise ratio and a frequency domain peak value transmitted by the 5G user terminal equipment based on the NR downlink frame header position, the time frequency resource position and length occupied by the PUSCH of the 5G user terminal equipment and the configuration parameters of the PUSCH DMRS;

comparing a frequency domain index value deduced according to the PUSCH DMRS configuration parameters with a frequency domain peak index value of the 5G user terminal equipment calculated from the uplink wireless signal, wherein if the frequency domain index value is consistent with the frequency domain peak index value, the maximum correlation value is effective;

and when the maximum correlation value is valid, calculating the power value of the 5G user terminal equipment.

The user terminal equipment measures the downlink reference signal to obtain the sending and receiving time difference; and the base station measuring unit captures the uplink reference signal, measures the sending and receiving time difference, summarizes the uplink reference signal to the positioning server, and obtains the required position information through multiple interactive solution.

For a network positioning server to interact with user terminal equipment for multiple times through a 5G base station, a 5G NR Multi-cell RTT positioning technology is used, the prior mobile communication network positioning DL-TDOA technology requires strict synchronization of each base station, but the Multi-cell RTT technology does not depend on the strict synchronization between the base stations, the measurement precision is not influenced by the synchronization precision between the base stations, but the terminal is required to know the exact time when a signal starts to be transmitted.

For the position calculation, the position calculation is carried out under the condition that the network positioning server establishes connection with the user terminal equipment through the 5G base station, and the specific steps are as follows:

1. the network positioning server acquires receiving-transmitting point (TRP) information required by positioning through Multi-RTT, and requests positioning capability and UL information of the target equipment.

For the acquisition of TRP information required for Multi-RTT positioning, the following steps are adopted:

1) the network location server determines that certain TRP configuration INFORMATION is required and sends an NRPPa TRP INFORMATION REQUEST message to the gNB-the REQUEST including an indication of which particular TRP configuration INFORMATION is requested.

2) The gNB provides the requested TRP INFORMATION in an NRPPa TRP INFORMATION RESPONSE message (if available at the gNB). If the gNB cannot provide any INFORMATION, it returns a TRP INFORMATION FAILURE message indicating the reason for the FAILURE.

3) The UL INFORMATION of the target device is obtained by the network location server sending an NRPPa position INFORMATION REQUEST message to the serving gNB.

The gNB determines resources available for the UL-SRS and configures the target device with a set of UL-SRS resources, and the gNB provides the UL-SRS configuration INFORMATION to the network location server in an NRPPa POSITIONING INFORMATION RESPONSE message.

3. In the case of semi-persistent or aperiodic SRS, the network location server may request activation of UE SRS transmission by sending an NRPPa location activation request message to the serving gNB of the target device, which then activates UE SRS transmission and sends an NRPPa location activation response message. And the target equipment starts UL-SRS transmission according to the time domain behavior of the UL-SRS resource configuration.

4. The network location server provides UL information to the selected gNB in an NRPPa MEASUREMENT REQUEST message that includes all the information needed to enable the gNB/TRP to perform UL MEASUREMENTs.

5. The network positioning server sends an LPP provide assistance data message to the target device that includes any assistance data needed by the target device to perform the necessary DL-PRS measurements.

6. The network location server sends an LPP request location information message to request a Multi-RTT measurement.

7. The target device reports DL-PRS measurements of Multi-RTT to the network positioning server in an LPP provide location information message.

8. Each gNB reports the user terminal device SRS measurement results to the network location server in an NRPPa measurement response message.

9. The network location server sends an NRPPa POSITIONING DEACTIVATION message to the serving gNB.

10. The network positioning server determines RTT of each gNB providing corresponding UL and DL measurements according to the UE and gNB Rx-Tx time difference measurements, and calculates the position of the target device.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A high-precision carrier positioning method based on 5G transmission power control is characterized by comprising the following steps:

s1: the user terminal equipment establishes connection with a network positioning server through a 5G base station in a target cell to complete initialization information configuration, and then the 5G base station transmits a downlink 5G NR signal to support the user terminal equipment to obtain a position service request;

s2: the method comprises the steps that a user terminal device captures a 5G NR signal, after initialization information is obtained, relevant data and configuration information required by positioning are obtained through a tracking loop, a first power control parameter is determined based on first receiving power of the user terminal device and the transmission situation of expected positioning data, and system resources required to be allocated for current positioning and transmission power required for transmitting SRS to a base station device are determined at least based on the first power control parameter;

s3: and carrying out multiple interactions between the user terminal equipment and the 5G base station, and carrying out position calculation to obtain accurate position information of the user terminal equipment.

2. The method as claimed in claim 1, wherein the user terminal device in step S1 is an electronic device capable of receiving 5G NR signals for positioning, and the user terminal device includes any one of a communication device, a user equipment, a subscriber station, an unmanned aerial vehicle, a portable subscriber station, a mobile station, or an access terminal.

3. A high accuracy carrier location method based on 5G transmission power control according to claim 2, wherein the user terminal equipment further comprises any one of mobile phones, cellular phones, smart phones, voice over IP phones, wireless local loop phones, tablets, wearable terminal equipment, personal digital assistants, portable computers, desktop computers, image capture terminal equipment, game terminal equipment, music storage and playback equipment, vehicle-mounted wireless terminal equipment, wireless endpoints, mobile stations, laptop embedded equipment, laptop installed equipment, USB dongle, smart equipment, wireless customer premises equipment, internet of things equipment, watches or other wearable equipment, head-mounted displays, vehicles, drones, medical equipment and applications, industrial equipment and applications, and consumer electronics.

4. The method as claimed in claim 1, wherein the target cell in step S1 includes a serving cell where the ue is located and one or more neighboring cells.

5. The method of claim 1, wherein the 5G base station comprises a gNB under independent networking and a ng-eNB or an en-gNB under non-independent networking; wherein, the gNB is a 5G base station which is in butt joint with a 5G core network under independent networking; under the NSA networking architecture of the ng-eNB in the Option4 series, the 4G base station needs to be upgraded to support the enhanced LTE and is in butt joint with a 5G core network, and the upgraded 4G base station is the ng-eNB; the en-gNB is an Option3 series NSA networking architecture, and the 5G base station which is in butt joint with the 4G core network is the en-gNB.

6. The method as claimed in claim 1, wherein the 5G NR signal further includes data and configuration information related to a positioning process under the premise of guaranteeing 5G high rate communication service.

7. A high accuracy carrier positioning method based on 5G transmission power control according to claim 6, characterized in that the configuration information includes following indication information:

target device information required to transmit a positioning reference signal, and resource information allocated for transmitting the positioning reference signal to the target device;

determining a first power control parameter based on a first received power of a user terminal device and a transmission scenario of expected positioning data;

the allocated system resources required for the current positioning and the required transmission power for transmitting the SRS to the base station apparatus are determined based on at least the first power control parameter.

8. A high-precision carrier positioning method based on 5G transmission power control according to claim 1, wherein, in the process of receiving the positioning reference signal by the user terminal equipment in the step S2, the 5G signal transmitted by the base station is firstly acquired, the purpose of the acquisition phase is to determine the 5G base stations near the receiver, and roughly estimate the corresponding start time and Doppler frequency, after the carrier frequencies of the surrounding gNB are acquired, the user terminal equipment starts sampling the 5G signal with at least a sufficient sampling rate, to acquire the entire SSB/PBCH bandwidth and convert the signal to the baseband domain by removing the carrier frequency, then search and acquire the start time and doppler frequency of the current positioning operation, after obtaining initial rough estimates of the start time and doppler frequency, the subscriber terminal equipment refines and holds these estimates through the tracking loop.

9. The method of claim 8, wherein for acquisition of 5G NR signals, the UE determines at least one transmit beam of a received PRS, performs beamforming on the receive beam according to a specified beam direction, and receives at least one PRS signal using the beamformed receive beam.

10. A high-precision carrier positioning method based on 5G transmission power control as claimed in claim 1, wherein the 5GNR signal is a positioning reference signal in terms of positioning, the positioning reference signal is a sinusoidal signal of pure carrier or a positioning reference signal modulated by random sequence, and the carrier frequency is a pre-configured or pre-defined carrier frequency.