A one-way ranging positioning method based on wireless signal arrival time

Abstract

The present invention provides a positioning method based on the arrival time of wireless signals, comprising: performing ranging interaction between a wireless device and multiple base stations, wherein the wireless device sends a one-way ranging request in the form of a reference signal; obtaining a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer; obtaining the position of the wireless device relative to the base station based on the ranging data packets fed back by the multiple base stations; the present invention can obtain more accurate sending time and arrival time of the reference signal at the physical layer without encapsulating, sending, unpacking and parsing the data packet at the application layer, and obtain more accurate signal theoretical flight time, thereby improving the positioning accuracy of the positioning method based on the arrival time of wireless signals.

Description

Technical Field

[0001] The present invention relates to the field of wireless communications, in particular to the field of positioning of mobile devices, and more particularly to a one-way ranging positioning method based on wireless signal arrival time. Background Art

[0002] For wireless positioning systems, most common positioning methods are based on distance measurement values. Positioning based on distance measurement values ​​can be divided into two categories. One is the measurement method of coordinate position; the other is the measurement method of position-related parameters, which indirectly measures the distance by measuring parameter values, including measurement methods based on time of arrival (TOA), time difference of arrival (TDOA), etc.

[0003] The principle of the positioning method based on the arrival time of wireless signals is to measure the flight time (TOF) of the signal from the tag to be located (transmitter) to the base station (receiver), multiply it by the propagation speed of the signal in the air to obtain the distance measurement value, and then estimate the tag position by solving the nonlinear circular coordinate equations. Therefore, inaccurate flight time measurement will lead to a large measurement error, which will be further amplified when the solution obtained by the nonlinear circular equation is not accurate enough during positioning estimation. The main reasons for inaccurate measurement in the current positioning method based on the arrival time of wireless signals include errors caused by the clock asynchrony between the tag to be measured and the base station, and errors caused by the difficulty in accurately measuring the arrival time of the first path due to multipath and non-line-of-sight (NLOS) propagation. The difference in ranging accuracy of different measurement methods will directly affect the final positioning accuracy, so it is particularly important to reasonably select the ranging method to improve the ranging accuracy.

[0004] Among the commonly used positioning methods based on the arrival time of wireless signals, the ranging methods mainly include one-way ranging and two-way ranging.

[0005] The schematic diagram of single-way ranging (SWR) is shown in Figure 1 , which is done by a signal interaction between the wireless device and the base station (sending a polling data packet, Poll), and then the base station sends a ranging data packet (Ranging) to the wireless device for positioning calculation. The wireless device first records the timestamp t of sending the polling data packet S , sends the polling data packet to the base station, after the flight time t F After the base station receives the polling data packet, it records the receiving timestamp t R ; The base station responds after a delay of time t replyAfter that, the ranging data packet is returned. The ranging data packet carries the receiving timestamp t of the base station receiving the polling data packet. R Information. After receiving the ranging data packet, the wireless device analyzes and calculates the flight time TOF, and then multiplies it by the speed of light to get the end-to-end distance. Based on the measured distances from multiple base stations, the position of the wireless device can be obtained through the nonlinear circle equation coordinate solution. Alternatively, after receiving the ranging data packet, the wireless device can also solve the distance-related timestamp information in the ranging data packets measured by multiple base stations and send it to a certain base station, which determines the location of the wireless device. In fact, since the traditional one-way ranging method interacts between devices by sending and receiving data packets, the encapsulation and unpacking process of the data packet takes a certain amount of time, including the processing delay of the physical layer and protocol layer for the data packet, and the encapsulation and unpacking delay of the application layer. After considering the processing delay of the data packet and the encapsulation and unpacking delay, the schematic diagram of the one-way ranging considering the data packet encapsulation and unpacking time is as follows Figure 2 As shown, the following process is included:

[0006] (1) The wireless device sends a polling packet

[0007] The wireless device first records the sending timestamp t S , after time t pack Then the Poll data packet is encapsulated and sent to the base station. After the actual flight time t F(Truth) After the base station receives the data packet, after t unpack Time to unpack data and parse it, record the receiving timestamp t R .

[0008] (2) The base station returns a ranging data packet

[0009] The base station responds after a delay of time t reply After the packaging time t pack The ranging data packet is returned to the wireless device, and the ranging data packet carries the arrival timestamp t of the base station R Information, after passing t F(Truth) After time, the wireless device receives the ranging data packet and passes t unpack Unpacking and parsing.

[0010] (3) Ultimately, wireless devices can calculate flight time

[0011] t F =t F(Truth) +t pack +t unpack =t R -t S ;

[0012] Therefore, by Figure 2It can be concluded that the measurement error between the theoretical flight time and the actual flight time is:

[0013] e 1 =t F -t F(Truth) =t pack +t unpack ;

[0014] The advantage of traditional one-way ranging is that it is easy to operate, but this ranging method is greatly affected by the asynchrony between the wireless device and the base station clock, that is, the timestamp t S With t R Since the timing does not start at the same time, there is a large error when performing the differential, which will be further amplified when reflected in the positioning estimation error, so the ranging accuracy is low. However, one-way ranging has the advantage of short ranging time and can be used in some scenarios where the user's approximate location needs to be obtained quickly. At the same time, during the ranging process, wireless devices and base stations usually interact in the form of data packets, and the encapsulation, sending, and unpacking and parsing time of data packets in the application layer are included in the calculation of the flight time TOF. The extremely small error of the flight time TOF will be amplified when converted to distance for positioning, resulting in poor positioning accuracy. For example, it may make it difficult for the final positioning accuracy to reach the meter level or even the sub-meter level.

[0015] Therefore, it is necessary to improve the one-way ranging process in the traditional positioning method based on the wireless signal arrival time TOA to improve the positioning accuracy. Summary of the invention

[0016] Therefore, the object of the present invention is to overcome the defects of the prior art and provide a one-way ranging and positioning method based on the arrival time of wireless signals.

[0017] The objective of the present invention is achieved through the following technical solutions:

[0018] According to a first aspect of the present invention, a positioning method based on wireless signal arrival time is provided, comprising: performing ranging interaction between a wireless device and multiple base stations, wherein the wireless device sends a one-way ranging request in the form of a reference signal; obtaining, by the wireless device, a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer; and obtaining the position of the wireless device relative to the base station based on the ranging data packets fed back by the multiple base stations.

[0019] In some embodiments of the present invention, the arrival time of the reference signal is obtained by measuring the first path arrival time of the reference signal at the physical layer.

[0020] In some embodiments of the present invention, the method includes: broadcasting a one-way ranging request in the form of a reference signal by a wireless device, and recording the sending time of the one-way ranging request; obtaining the ranging data packet by the wireless device, wherein the arrival time of the reference signal in the ranging data packet is obtained by measuring the first path arrival time of the one-way ranging request by a base station at a physical layer.

[0021] In some embodiments of the present invention, the method further comprises: subtracting the sending time of the corresponding one-way ranging request from the arrival time thereof to obtain the theoretical flight time of the signal used for positioning calculation.

[0022] In some embodiments of the present invention, the method further includes: determining the distance between the wireless device and the corresponding base station based on the theoretical flight time of the signal; determining the position of the wireless device through a TOA positioning algorithm based on the distance between the wireless device and multiple base stations and the coordinates of the multiple base stations.

[0023] In some embodiments of the present invention, the method further comprises: before broadcasting the one-way ranging request each time, synchronizing the clock of the wireless device with a base station within its communication range.

[0024] In some embodiments of the present invention, the method also includes: configuring the carrier parameters of the carrier carrying the reference signal before the reference signal sent by the wireless device, so as to configure different physical layer IDs for the carriers transmitting reference signals of different wireless devices; when the base station receives the corresponding reference signal, identifying the identity of the sender of the reference signal through the physical layer ID of the carrier and associatively recording the arrival time of the reference signal.

[0025] In some embodiments of the present invention, the method also includes: dynamically allocating the correspondence between the wireless device and the physical layer ID in the base station, wherein, when the wireless device enters the coverage of the base station, the physical layer ID is allocated to it; when the wireless device leaves the coverage of the base station, the physical layer ID allocated to it is recovered.

[0026] In some embodiments of the present invention, the method further includes: binding the physical layer ID of the wireless device to the IP address or MAC address of the wireless device; when the base station receives the corresponding reference signal, identifying the identity of the sender of the reference signal through the physical layer ID of the carrier, and feeding back the ranging data packet to the corresponding wireless device through the IP address or MAC address bound to the physical layer ID.

[0027] According to a second aspect of the present invention, a wireless communication system is provided, comprising a wireless device and a plurality of base stations, wherein the wireless device and the plurality of base stations are configured to locate the wireless device using the method described in the first aspect.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] The present invention improves the traditional positioning method based on flight time. The wireless device interacts with multiple base stations for ranging. During the ranging interaction, the wireless device sends a one-way ranging request in the form of a reference signal. The wireless device obtains a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer. Without encapsulating and sending the data packet and unpacking and parsing the data packet at the application layer, a more accurate sending time and arrival time of the reference signal can be obtained at the physical layer, and a more accurate theoretical flight time of the signal can be obtained, thereby improving the positioning accuracy of the positioning method based on the arrival time of the wireless signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The embodiments of the present invention are further described below with reference to the accompanying drawings, in which:

[0031] Figure 1 The schematic diagram of the existing one-way ranging;

[0032] Figure 2 The schematic diagram of the existing one-way ranging considering the packet encapsulation and unpacking time is shown;

[0033] Figure 3 The figure is a schematic diagram of the principle of a one-way ranging scenario in a positioning method based on wireless signal arrival time according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] As mentioned in the background technology section, in the existing positioning method based on the arrival time of wireless signals, since all communications in the interaction process use data packets, the duration of the encapsulation, transmission and unpacking analysis of the data packets is included in the calculation of the flight time, resulting in poor positioning accuracy. In order to improve the positioning accuracy of the positioning method based on the flight time, the present invention improves the traditional positioning method based on the flight time, and the wireless device interacts with multiple base stations for ranging. During the ranging interaction, the one-way ranging request of the wireless device is sent in the form of a reference signal; the wireless device obtains the ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer. Without the encapsulation, transmission and unpacking analysis of the data packet by the application layer, a more accurate transmission time and arrival time of the reference signal can be obtained at the physical layer, and a more accurate theoretical flight time of the signal can be obtained, thereby improving the positioning accuracy of the positioning method based on the arrival time of the wireless signal.

[0036] According to one embodiment of the present invention, the present invention provides a positioning method based on the arrival time of a wireless signal, comprising: a wireless device performs ranging interaction with multiple base stations, during which a one-way ranging request of the wireless device is sent in the form of a reference signal; the wireless device obtains a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer. The method also includes: positioning the wireless device according to the ranging data packet fed back by multiple base stations. For example, a positioning method based on the arrival time of a wireless signal comprises: a wireless device performs ranging interaction with multiple base stations, wherein the wireless device sends a one-way ranging request in the form of a reference signal; the wireless device obtains a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries the arrival time of the reference signal measured by the base station at the physical layer; and obtains the position of the wireless device relative to the base station based on the ranging data packets fed back by multiple base stations. Preferably, the arrival time of the reference signal is obtained by measuring the first path arrival time of the reference signal at the physical layer. For example, a power strength threshold of the reference signal is set, and the first path arrival time is determined according to the power strength threshold, and the time of arrival of the path that arrives first and has a power strength greater than or equal to the power strength threshold is used as the first path arrival time of the reference signal. This is only used for illustration, and other technologies in the field for measuring the first path arrival time of a signal can be used, which will not be repeated here. The technical solution of this embodiment can at least achieve the following beneficial technical effects: the present invention improves the traditional positioning method based on the arrival time of the wireless signal, and the signal of the one-way ranging request between the wireless device and the base station is sent in the form of a reference signal, and the arrival time of the reference signal is measured at the physical layer, thereby avoiding the calculation of the encapsulation and unpacking delay of the data packet into the theoretical flight time of the signal, thereby improving the positioning accuracy of the positioning method based on the arrival time of the wireless signal.

[0037] According to one embodiment of the present invention, a reference signal (RS) is a signal sent by configuring time-frequency resources at the physical layer. In the present invention, a reference signal refers to a reference signal sent by configuring time-frequency resources at the physical layer for positioning based on the arrival time of a wireless signal. Usually, reference signals are often used for channel estimation (pilot), channel detection, etc. In the present invention, a reference signal can be a signal added in addition to the original reference signal of a wireless communication system in order to implement a positioning method based on the arrival time of a wireless signal. For example, in addition to the reference signals SRS, DMRS, CRS, etc. of 4G LTE, a reference signal of the present invention is added, and relevant rules are set to realize the transmission and identification of the reference signal. For another example, in addition to the reference signals DM-RS, PT-RS, CSI-RS, T-RS, S-TS, etc. of 5G NR, a reference signal of the present invention is added. Taking 5G NR as an example, the basic parameters of the reference signal of the present invention can be configured according to 3GPP 5G NR physical layer protocol 38.211\214 or other versions of the protocol, and the present invention will not elaborate on this. In the time-frequency mapping relationship, the most basic unit is the resource element (RE), which is defined as a subcarrier in the frequency domain and a symbol in the time domain. In 5G NR, multiple resource elements in the frequency domain form a resource block (RB\PRB). For example, 12 consecutive resource elements in the frequency domain form a resource block. A resource grid is composed of multiple resource blocks, and the resource grid represents the entire time-frequency domain mapping structure. In the frame structure of the reference signal, a frame (Frame) contains n subframes (Subframe). The basic frame structure uses time slots as the basic granularity. Different numbers of time slots can be set in a frame. The absolute time length of the time slot changes with different numbers of time slots. The number of time slots contained in a subframe can be determined by the parameter μ, which means that each subframe contains 2 μtime slots. According to one embodiment of the present invention, the resource space occupied by the reference signal is a symbol in a subcarrier, that is, an RE; or, the resource space occupied by the reference signal is multiple symbols in a subcarrier; or, the resource space occupied by the reference signal is multiple symbols in multiple subcarriers. In actual application, the reference signal can also be set according to the specific circumstances of the communication system or protocol. In addition to the number of subcarriers and the number of symbols, some communication systems or protocols have other parameters that can be set. For example, in 5G, in addition to the number of subcarriers and the number of symbols occupied by the reference signal, different subcarrier spacings (SCS), the number of symbols per unit time slot (Symbol) and / or comb size (Comb size) can be flexibly configured to achieve different time-frequency domain resource configurations (Pattern) to meet the needs of positioning using reference signals and distinguishing from the original reference signals of the system. For example, after configuration, the reference signal is represented in the resource grid as a sequential arrangement or an interlaced structure arrangement. In addition, for the reference signal design under other protocol standards, there may be different reference signal setting methods and rules, which can be flexibly configured according to specific circumstances. According to one embodiment of the present invention, the reference signal is a signal used for positioning that is sent out at the physical layer by configuring the number of subcarriers, subcarrier spacing, number of symbols, time slot length, cyclic prefix length of the symbol, or a combination thereof.

[0038] According to an embodiment of the present invention, a positioning method based on the arrival time of a wireless signal is provided, which adopts a one-way ranging method for positioning, including: a wireless device broadcasts a one-way ranging request in the form of a reference signal, and records the sending time of the one-way ranging request; the wireless device obtains the ranging data packet, wherein the arrival time of the reference signal in the ranging data packet is obtained by measuring the first path arrival time of the one-way ranging request at the physical layer by the base station. For example, the wireless device broadcasts the one-way ranging request in the form of a reference signal, and records the sending time of the one-way ranging request; the base station measures the first path arrival time of the one-way ranging request at the physical layer, and uses it as the arrival time of the one-way ranging request; the base station encapsulates the arrival time of the one-way ranging request into the ranging data packet and sends it to the wireless device in the form of a non-reference signal for positioning calculation. Preferably, in the one-way ranging, the wireless device can obtain the ranging data packet, subtract the sending time of the one-way ranging request from the arrival time of the one-way ranging request, and obtain the signal theoretical flight time for positioning calculation. It should be understood that the calculations performed for positioning in the present invention are not limited to the wireless device itself. For example, if a base station needs to obtain the location of the wireless device, the wireless device can obtain ranging data packets from multiple base stations, and then send the multiple ranging data packets to the base station that needs to obtain the location of the wireless device, and the base station can locate the wireless device based on the multiple ranging data packets.

[0039] Combine the following Figure 3 To further illustrate the process of one-way ranging, according to an embodiment of the present invention, in the method, the ranging interaction process corresponding to the one-way ranging includes: the wireless device broadcasts the one-way ranging request in the form of a reference signal and records the sending time of the one-way ranging request; the base station measures the first path arrival time of the one-way ranging request at the physical layer and uses it as the arrival time of the one-way ranging request; the base station encapsulates the arrival time of the one-way ranging request into a ranging data packet and sends it to the wireless device in the form of a non-reference signal for positioning calculation. Preferably, during one-way ranging, the wireless device can obtain the ranging data packet, subtract the sending time of the one-way ranging request from the arrival time of the one-way ranging request, and obtain the signal theoretical flight time for positioning calculation. It should be understood that the calculation for performing positioning in the present invention is not limited to the wireless device itself. For example, if a base station needs to obtain the position of the wireless device, the wireless device can obtain the ranging data packets of multiple base stations, and then send the multiple ranging data packets to the base station that needs to obtain the position of the wireless device, and the base station locates the wireless device based on the multiple ranging data packets.

[0040] like Figure 3 As shown, the ranging interaction process corresponding to the one-way ranging includes: the wireless device transmits a reference signal TRS (corresponding to the one-way ranging request) to the base station, wherein the wireless device records the signal transmission timestamp of sending the reference signal TRS (corresponding to the sending time of the one-way ranging request); flight time After the reference signal TRS arrives at the base station, the base station records the signal arrival timestamp of the received reference signal TRS at the physical layer (corresponding to the arrival time of the reference signal (one-way ranging request)); the base station sends a ranging data packet (Ranging data packet) to the wireless device, where the ranging data packet contains the signal arrival timestamp Wireless devices send timestamps based on signals and signal arrival timestamp Determine the signal flight time (corresponding to the signal theoretical flight time) and determine the distance between the wireless device and the base station, where the signal flight time According to the distance between the wireless device and multiple base stations and the position coordinates of multiple base stations, the nonlinear circular coordinate equations are solved to determine the position of the wireless device. delay Then send the ranging data packet to the wireless device, and after the encapsulation time t pack , actual flight time t F(Truth) After that, the wireless device has passed time t unpack Unpack and parse the ranging data packet. The sending and parsing of the ranging data packet takes time t F =t pack +t F(Truth) +tunpack ; At the second receiving time Parse the signal arrival timestamp contained in the ranging data packet It can be seen that the one-way ranging process of the present invention uses a reference signal and records the arrival time of the reference signal at the physical layer, so there is no need to consider the encapsulation and unpacking process of the data packet, thereby accurately measuring the arrival time of the reference signal. At the same time, the encapsulation and unpacking time of the ranging data packet does not participate in the calculation of the flight time, so it will not affect the final result. The theoretical flight time calculated by the present invention is closer to the actual flight time, and the flight time TOF measurement is more accurate. Preferably, the one-way ranging is performed under the condition that the base station and the wireless device are clock synchronized to reduce the error caused by clock asynchrony.

[0041] In order to record the arrival time of the corresponding reference signal at the physical layer and improve the accuracy of the flight time of the recorded signal, according to an embodiment of the present invention, a positioning method based on the arrival time of a wireless signal includes: configuring the carrier parameters of the carrier carrying the reference signal before the reference signal sent by the wireless device, so as to configure different physical layer IDs for the carriers transmitting the reference signal of different wireless devices; when the base station receives the corresponding reference signal, the identity of the sender of the reference signal is identified by the physical layer ID of the carrier and the arrival time of the reference signal is recorded in association. The technical solution of this embodiment can at least achieve the following beneficial technical effects: the present invention can configure different physical layer IDs for the carriers transmitting the reference signal of different wireless devices or base stations by configuring the carrier parameters, add identification logic at the physical layer, so as to identify the identity of the sender at the physical layer and record the arrival time of the corresponding reference signal in association; thereby, the party receiving the reference signal only parses and records the arrival time of the reference signal at the physical layer to obtain the arrival time of the reference signal; without passing or adopting the form of parsing the data packet at the application layer to obtain the arrival time of the reference signal, the accuracy of determining the flight time of the wireless signal can be improved, and the accuracy of determining the flight time of the wireless signal can be improved, which is conducive to more accurate positioning later.

[0042] In order to reduce the waste of resources caused by the occupation of physical layer ID by wireless devices that leave the coverage of the base station, according to one embodiment of the present invention, the positioning method based on the arrival time of wireless signals also includes: dynamically allocating the physical layer ID of the wireless device in the base station, wherein when the wireless device enters the coverage of the base station, the physical layer ID is allocated to it; when the wireless device leaves the coverage of the base station, the physical layer ID allocated to it is recovered. The technical solution of this embodiment can at least achieve the following beneficial technical effects: the present invention dynamically allocates the physical layer ID of the wireless device in the base station, which can save storage resources and avoid overly complicated carrier parameter settings, thereby ensuring the efficiency of positioning.

[0043] In order to accurately and quickly feed back the ranging data packet to the corresponding sender after receiving the one-way ranging request, according to one embodiment of the present invention, the physical layer ID of the wireless device is bound to the IP address or MAC address of the wireless device; when the base station receives the corresponding reference signal, the identity of the sender of the reference signal is identified through the physical layer ID of the carrier, and the ranging data packet is fed back to the corresponding wireless device through the IP address or MAC address bound to the physical layer ID.

[0044] According to one embodiment of the present invention, the present invention further provides a wireless communication system, including a wireless device and multiple base stations, wherein the wireless communication system is configured to locate the wireless device using the positioning method based on the wireless signal arrival time of the aforementioned embodiment. For example, the wireless device and / or the multiple base stations are configured to locate the wireless device using the positioning method based on the wireless signal arrival time of the aforementioned embodiment.

[0045] It should be noted that although the above describes the various steps in a specific order, it does not mean that the various steps must be executed in the above specific order. In fact, some of these steps can be executed concurrently or even in a different order as long as the required functions can be achieved.

[0046] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0047] Computer readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. Computer readable storage medium can include, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (non-exhaustive list) of computer readable storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, for example, a punch card or a protruding structure in a groove on which instructions are stored, and any suitable combination thereof.

[0048] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A positioning method based on wireless signal arrival time, characterized in that: include: The wireless device performs ranging interaction with multiple base stations, wherein the wireless device sends a one-way ranging request in the form of a reference signal and records the sending time of the one-way ranging request; The wireless device obtains a ranging data packet fed back by the base station in response to the one-way ranging request, wherein the ranging data packet carries an arrival time of a reference signal measured by the base station at a physical layer; The position of the wireless device relative to the base station is obtained based on the ranging data packets fed back by multiple base stations, wherein the arrival time of the corresponding one-way ranging request is subtracted from its sending time to obtain the signal theoretical flight time used for positioning calculation, and the wireless device performs the positioning calculation based on the signal theoretical flight time.

2. The method according to claim 1, characterized in that The arrival time of the reference signal is obtained by measuring the first path arrival time of the reference signal at the physical layer.

3. The method according to claim 2, characterized in that The method comprises: A one-way ranging request is broadcasted by the wireless device in the form of a reference signal; The ranging data packet is acquired by the wireless device, wherein the arrival time of the reference signal in the ranging data packet is obtained by measuring the first path arrival time of the one-way ranging request by the base station at the physical layer.

4. The method according to claim 3, characterized in that The method further comprises: Determine the distance between the wireless device and the corresponding base station based on the signal theoretical flight time; The location of the wireless device is determined by a TOA positioning algorithm according to the distance between the wireless device and multiple base stations and the coordinates of the multiple base stations.

5. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Before each broadcast of a one-way ranging request, the wireless device is first clock-synchronized with a base station within its communication range.

6. The method according to any one of claims 1 to 4, characterized in that: The method further comprises: Before the reference signal sent by the wireless device, configure the carrier parameters of the carrier carrying the reference signal, so as to configure different physical layer IDs for the carriers transmitting the reference signals of different wireless devices; When the base station receives the corresponding reference signal, it identifies the identity of the sender of the reference signal through the physical layer ID of the carrier and associates and records the arrival time of the reference signal.

7. The method according to claim 6, characterized in that The method further comprises: The correspondence between the wireless device and the physical layer ID in the base station is dynamically allocated, wherein when the wireless device enters the coverage of the base station, the physical layer ID is allocated to it; when the wireless device leaves the coverage of the base station, the physical layer ID allocated to it is recovered.

8. The method according to claim 7, characterized in that The method further comprises: Bind the physical layer ID of the wireless device to the IP address or MAC address of the wireless device; When the base station receives the corresponding reference signal, it identifies the identity of the sender of the reference signal through the physical layer ID of the carrier, and feeds back the ranging data packet to the corresponding wireless device through the IP address or MAC address bound to the physical layer ID.

9. A wireless communication system, comprising a wireless device and a plurality of base stations, characterized in that: The wireless device and the plurality of base stations are configured to locate the wireless device using the method according to any one of claims 1-8.

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