Transmission delay measurement method, positioning method, terminal, base station, storage medium

Abstract

The application provides a transmission delay measurement method, a positioning method, a terminal, a base station and a storage medium. The transmission delay measurement method comprises the following steps: acquiring a downlink reference signal transmitted by a base station, determining a LOS path and a reference path from a transmission path of the downlink reference signal; acquiring a reference delay difference, wherein the reference delay difference is a difference between downlink transmission delays of the LOS path and the reference path; transmitting an uplink reference signal to the base station, so that the base station acquires an uplink transmission delay of the reference path; and reporting the reference delay difference to the base station, so that the base station obtains an uplink transmission delay of the LOS path according to the uplink transmission delay of the reference path and the reference delay difference. According to the scheme provided in the embodiment of the application, the base station can acquire the uplink transmission delay of the reference path through an uplink reference signal, and then calculate the uplink transmission delay of the LOS path in combination with the reference delay difference, thereby effectively reducing the resource cost of measuring the uplink transmission delay of the LOS path.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of wireless communication, and particularly to a transmission delay measurement method, a positioning method, a terminal, a base station, and a storage medium. Background Technology

[0002] With the development of communication technology, positioning has become an indispensable function of communication equipment, and distance measurement is a key component of positioning, generally achieved by measuring the transmission delay between the transmitting and receiving ends. Since it is difficult for current commercial base stations and terminals to maintain a high degree of consistency in time reference, international standardization organizations have proposed Round Trip Time (RTT) measurement in relevant standards.

[0003] The line-of-sight (LOS) path is a transmission path where the transmitted signal is not reflected; therefore, the transmission delay of the LOS path is crucial information for RTT (Real-Time Tolerance) measurement. However, when the terminal's transmit power is low, the reference signal transmitted through the LOS path can easily be overwhelmed by sidelobes, noise, or interference from the non-line-of-sight (NLOS) path.

[0004] To address this issue, the terminal typically transmits multiple uplink reference signals consecutively to improve the signal-to-noise ratio (SNR) of the signal received by the base station, thereby detecting the LOS path and measuring its uplink transmission delay. However, when the SNR of the uplink reference signals transmitted by the terminal is low, a large number of uplink reference signals need to be transmitted, resulting in significant resource overhead. Summary of the Invention

[0005] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0006] This invention provides a transmission delay measurement method, a positioning method, a terminal, a base station, and a storage medium, which can measure the uplink transmission delay of the LOS path with less resource overhead when the terminal transmit power is low.

[0007] In a first aspect, embodiments of the present invention provide a transmission delay measurement method, applied to a terminal, the transmission delay measurement method comprising:

[0008] Obtain the downlink reference signal sent by the base station, and determine the LOS path and reference path from the transmission path of the downlink reference signal;

[0009] Obtain a reference delay difference, which is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path;

[0010] Send an uplink reference signal to the base station so that the base station can obtain the uplink transmission delay of the reference path based on the uplink reference signal;

[0011] The reference delay difference is reported to the base station so that the base station can obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference.

[0012] Secondly, embodiments of the present invention also provide a transmission delay measurement method, applied to a base station, the transmission delay measurement method comprising:

[0013] Send a downlink reference signal to the terminal so that the terminal can determine the LOS path and the reference path from the transmission path of the downlink reference signal;

[0014] Obtain the uplink reference signal sent by the terminal, and obtain the uplink transmission delay of the reference path based on the uplink reference signal;

[0015] The reference delay difference reported by the terminal is obtained, and the uplink transmission delay of the LOS path is obtained based on the uplink transmission delay of the reference path and the reference delay difference, wherein the reference delay difference is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path.

[0016] Thirdly, embodiments of the present invention also provide a positioning method applied to a positioning server, wherein the positioning server is communicatively connected to a base station and a terminal, and the positioning method includes:

[0017] The downlink transmission delay of the LOS path sent by the terminal and the uplink transmission delay of the LOS path sent by the base station are obtained, wherein the uplink transmission delay of the LOS path is obtained according to the transmission delay measurement method as described in the first aspect, or according to the transmission delay measurement method as described in the second aspect.

[0018] The location information of the terminal is determined based on the downlink transmission delay and uplink transmission delay of the LOS path.

[0019] Fourthly, embodiments of the present invention also provide a terminal, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the transmission delay measurement method as described in the first aspect.

[0020] Fifthly, embodiments of the present invention also provide a base station, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the transmission delay measurement method as described in the second aspect.

[0021] This invention includes: acquiring a downlink reference signal transmitted by a base station; determining a line-of-sight (LOS) path and a reference path from the transmission path of the downlink reference signal; acquiring a reference delay difference, wherein the reference delay difference is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path; transmitting an uplink reference signal to the base station, so that the base station acquires the uplink transmission delay of the reference path based on the uplink reference signal; and reporting the reference delay difference to the base station, so that the base station obtains the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference. According to the solution provided by this invention, even when the uplink power of the terminal is limited, an uplink reference signal enables the base station to acquire the uplink transmission delay of the reference path, and calculate the uplink transmission delay of the LOS path by combining the uplink transmission delay of the reference path and the reference delay difference, effectively reducing the resource overhead of measuring the uplink transmission delay of the LOS path.

[0022] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0024] Figure 1 This is a flowchart of a transmission delay measurement method applied to a terminal provided in an embodiment of the present invention;

[0025] Figure 2 This is a flowchart of determining the LOS path and reference path provided in another embodiment of the present invention;

[0026] Figure 3 This is a flowchart of generating a Sounding Reference Symbol (SRS) provided in another embodiment of the present invention;

[0027] Figure 4 This is a flowchart of reporting reference delay difference by modulating SRS, provided in another embodiment of the present invention;

[0028] Figure 5 This is a flowchart of determining the transmission beam provided in another embodiment of the present invention;

[0029] Figure 6This is a flowchart of reporting reference delay difference via communication signaling provided in another embodiment of the present invention;

[0030] Figure 7 This is a flowchart of a transmission delay measurement method applied to a base station provided in another embodiment of the present invention;

[0031] Figure 8 This is a flowchart for generating a reference SRS provided in another embodiment of the present invention;

[0032] Figure 9 This is a flowchart for obtaining the reference delay difference provided in another embodiment of the present invention;

[0033] Figure 10 This is a flowchart of determining the receiving beam provided in another embodiment of the present invention;

[0034] Figure 11 This is a flowchart of obtaining reference delay difference through communication signaling provided in another embodiment of the present invention;

[0035] Figure 12 This is a flowchart of Example 1 provided in another embodiment of the present invention;

[0036] Figure 13 yes Figure 12 The spectrum diagram of Example 1 is shown below;

[0037] Figure 14 This is a flowchart of Example 2 provided in another embodiment of the present invention;

[0038] Figure 15 yes Figure 14 The spectrum diagram of Example 2 is shown;

[0039] Figure 16 This is a flowchart of a positioning method provided in another embodiment of the present invention;

[0040] Figure 17 This is a schematic diagram of a terminal device provided in another embodiment of the present invention;

[0041] Figure 18 This is a schematic diagram of a base station device provided in another embodiment of the present invention. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0043] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, or the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0044] This invention provides a transmission delay measurement method, a positioning method, a terminal, a base station, and a storage medium. The transmission delay measurement method includes: acquiring a downlink reference signal transmitted by a base station; determining a LOS path and a reference path from the transmission path of the downlink reference signal; acquiring a reference delay difference, which is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path; transmitting an uplink reference signal to the base station, so that the base station can acquire the uplink transmission delay of the reference path based on the uplink reference signal; and reporting the reference delay difference to the base station, so that the base station can obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference. According to the solution provided by the embodiments of this invention, an uplink reference signal enables the base station to acquire the uplink transmission delay of the reference path, and calculate the uplink transmission delay of the LOS path by combining the uplink transmission delay of the reference path and the reference delay difference, effectively reducing the resource overhead of measuring the uplink transmission delay of the LOS path.

[0045] It is worth noting that although one of the technical backgrounds addressed by the technical solution of the present invention is the technical defect caused by the weak transmission power of the terminal, even if the terminal transmission power is sufficient and the base station can directly extract the signal corresponding to the LOS path from the transmitted signal, the method in the embodiments of the present invention can still be used to calculate the parameters of the LOS path by combining the reference delay difference and the parameters of the reference path. This will not limit the technical solution of the present invention.

[0046] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0047] like Figure 1 As shown, Figure 1 This is a transmission delay measurement method provided in one embodiment of the present invention, applied to a terminal. The transmission delay measurement method includes, but is not limited to, steps S110, S120, S130 and S140.

[0048] Step S110: Obtain the downlink reference signal sent by the base station, and determine the LOS path and reference path from the transmission path of the downlink reference signal.

[0049] It should be noted that the downlink reference signal can be a downlink positioning reference signal used for positioning, or other types of signals, as long as the terminal can determine each transmission path based on the downlink reference signal. Those skilled in the art are motivated to select specific signal types according to actual conditions, and this embodiment does not impose any limitations on this.

[0050] It is worth noting that since the signal transmission power of the base station can usually be considered sufficient, the downlink reference signal received by the terminal can be assumed to be unaffected by noise and interference. Based on this, the terminal can directly determine the LOS path from the transmission path of the downlink reference signal in any way. This embodiment does not impose many limitations on the method by which the terminal determines the LOS path.

[0051] It should be noted that the reference path can be any path other than the LOS path. The purpose of selecting the reference path is to use the fact that the uplink and downlink paths are the same, and to calculate the parameters of the LOS path by combining the parameters of the reference path with the reference delay difference. Of course, the uplink and downlink paths can be the same by using the same transmit and receive beams, which will not be limited here.

[0052] It is worth noting that the signal transmission of the LOS path is affected by factors such as the transmission environment and interference. Even if the terminal's transmit power is increased, the signal power of the LOS path and the interference signal will increase proportionally. Increasing the number of uplink reference signals will increase resource overhead. Furthermore, when the SNR of the LOS path transmission signal is extremely low, even if the number of uplink reference signals is increased, the base station may still have difficulty detecting the LOS path transmission signal. Based on this, this embodiment introduces a reference path and calculates the uplink transmission delay of the LOS path through the reference delay difference between the reference path and the LOS path. This not only saves resource overhead but also replaces direct measurement with calculation. Even with extremely low SNR, the uplink and downlink transmission delays of the LOS path can be accurately obtained.

[0053] It is worth noting that, when the transmission signal of the LOS path is not submerged, the base station can directly measure the uplink transmission delay, or it can adopt the technical solution of this embodiment to calculate the uplink transmission delay of the LOS path through the reference delay difference between the LOS path and the reference path. This calculation can replace measurement, ensuring that the uplink transmission delay of the LOS path is accurately obtained. Those skilled in the art are motivated to pre-set the acquisition method of the uplink transmission delay of the LOS path in the base station, and the terminal can send the corresponding uplink reference signal according to the acquisition method set by the base station. This embodiment does not limit this further.

[0054] Step S120: Obtain the reference delay difference, which is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path.

[0055] It should be noted that the reference delay difference can be the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path. Since the uplink and downlink transmission paths can be the same, the reference delay difference at the terminal side is the same as the reference delay difference at the base station side. Based on this, taking advantage of the strong signal power of the downlink reference signal received by the terminal, the reference delay difference is calculated at the terminal side. When the signal power received by the base station is weak, only the uplink reference delay of the reference path needs to be measured, and the uplink transmission delay of the LOS path can be calculated by combining the reference delay difference. Therefore, by adopting the technical solution of this embodiment, at least one reference delay difference and one uplink reference signal that can enable the base station to identify the reference path are needed to realize the uplink transmission delay of the LOS path, which effectively reduces the number of uplink reference signals that need to be sent for RTT measurement and saves resource overhead.

[0056] Step S130: Send an uplink reference signal to the base station so that the base station can obtain the uplink transmission delay of the reference path based on the uplink reference signal.

[0057] It should be noted that the uplink reference signal can be an uplink positioning reference signal used for positioning, such as the common SRS, and this embodiment does not limit it further.

[0058] It should be noted that, in order to ensure that the base station can measure the uplink transmission delay of the reference path, the transmission path with the strongest signal power can be used as the reference path. The uplink transmission delay can be measured in any way, and this embodiment does not impose any restrictions on it.

[0059] It is understandable that since the reference path is selected by the terminal from the transmission path, the reference path is unknown to the base station. Therefore, the terminal and the base station can agree on the identification method of the reference path in advance. For example, they can pre-set the same beam for signal transmission and reception through configuration information and take the path with the strongest signal power as the reference path. This embodiment does not impose any restrictions on this.

[0060] Step S140: The reference delay difference is reported to the base station so that the base station can obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference.

[0061] It should be noted that, based on the description of step S120, the uplink transmission delay of the LOS path can be measured using the same principle at both the transmitting and receiving ends by utilizing the reference delay difference of the transmission path. After the base station obtains the uplink transmission delay of the reference path and the reference delay difference, the data obtained by adding the two data is the uplink transmission delay of the LOS path.

[0062] It should be noted that the reporting method for the reference delay difference can be selected according to actual needs. Those skilled in the art are capable of determining the specific reporting method by modifying the device configuration information. For example, when signaling resources are sufficient, the terminal can be configured to report via additional signaling interaction, directly informing the base station of the reference delay difference. Using this technical solution, only one uplink reference signal needs to be sent to the base station, allowing the base station to determine the uplink transmission delay of the reference path, thereby obtaining the uplink transmission delay of the LOS path, which helps to save the resource overhead of sending the uplink reference signal. Alternatively, the base station can be pre-configured to report using the uplink reference signal carrying the reference delay difference. An uplink reference signal is modulated according to the reference delay difference. After receiving the uplink reference signal modulated according to the reference delay difference, the base station obtains the reference delay difference by measuring the difference between the reference paths in the two uplink reference signals. Using this technical solution, only two uplink reference signals need to be sent to achieve the measurement of the uplink transmission delay of the LOS path, effectively reducing resource overhead.

[0063] Additionally, refer to Figure 2 In one embodiment, Figure 1 Step S110 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0064] Step S210: The transmission path that first completes the downlink reference signal transmission is determined as the LOS path;

[0065] Step S220: Determine the signal received power of the transmission path of the downlink reference signal, and determine the reference path based on the signal received power, wherein the signal received power of the reference path is greater than or equal to the signal received power of the LOS path.

[0066] It should be noted that since the LOS path is a transmission path through which the transmitted signal is not reflected, it can be determined that the downlink reference signal transmitted through the LOS path will arrive at the terminal earliest. Furthermore, the base station's transmit power is usually sufficient, and there is no situation where the transmitted signal of the LOS path is submerged by noise. Therefore, it can be determined that the transmission path of the earliest received downlink transmission signal is the LOS path.

[0067] It is understood that the reference path can be any path other than the LOS path. For example, to facilitate identification, the path with the strongest signal power can be selected, or the centroid of all transmission paths can be used as the reference path. For instance, the centroid of the aforementioned transmission paths can be obtained by multiplying the delay of each transmission path by its signal power, summing the results, and then dividing by the sum of the signal power of all transmission paths to obtain a virtual path. The specific method for selecting the reference path can be determined according to the specific situation of the transmitted signal. It is understood that, in order to reduce resource overhead, only one transmission path can be selected as the reference path. Of course, the number of reference paths can be appropriately increased when resources are sufficient, thereby improving the accuracy of data measurement. This embodiment does not impose any limitations on this.

[0068] In another embodiment, the uplink reference signal is SRS, which is used as the reference signal. Figure 3 , Figure 1 Step S130 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0069] Step S310: Generate reference SRS;

[0070] Step S320: The reference SRS is sent to the base station so that the base station can determine the reference path from the transmission path of the reference SRS.

[0071] It should be noted that for Orthogonal Frequency Division Multiplexing (OFDM) systems, the uplink reference signal is the SRS. It can be generated and transmitted using the SRS configuration method specified by existing protocols or standards, so that the delay obtained by the base station through the reference SRS is the actual delay, providing a reference basis for the uplink transmission delay calculation of the subsequent LOS path.

[0072] Additionally, refer to Figure 4 In one embodiment, Figure 1 Step S140 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0073] Step S410: Generate a new reference SRS, and modulate the new reference SRS according to the reference time delay difference to obtain the modulated SRS;

[0074] Step S420: The modulated SRS is sent to the base station so that the base station can obtain the reference delay difference based on the modulated SRS and the reference SRS, and obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference.

[0075] It should be noted that the identification methods of the reference SRS and modulation SRS can be pre-set in the base station. For example, the terminal sends two consecutive OFDM symbols to the base station in one time slot. The SRS on the first received OFDM symbol is the reference SRS, and the SRS on the second received OFDM symbol is the modulation SRS. Those skilled in the art know how to set this up in the base station, so it will not be elaborated here.

[0076] It should be noted that for OFDM systems, the expression for the uplink reference signal is s(k,l), where k is the frequency index and l is the symbol index. Therefore, the expression for the transmitted reference SRS can be s. tx (k,l ref )=s(k,l ref In order to carry the reference time delay difference, modulation can be based on the reference SRS. For example, the modulated SRS obtained by modulation is s tx (k,l)=s(k,l)·exp(j2πηΔτ los,ref kΔf+φ), where j is the imaginary part, π is pi, and Δτ los,ref Here, φ is the reference delay difference, k is the frequency index, Δf is the subcarrier spacing of the terminal, and η is a scaling parameter preset by the terminal and the base station, which can be set to ±1. Compared to the reference SRS, which reflects the true uplink transmission delay, modulating the SRS as an OFDM symbol can cause a certain deviation in the delay received by the receiver. This deviation is related to the reference delay difference. Through the technical solution of this embodiment, the acquisition of the reference delay difference can be transformed into the acquisition of the difference between symbols. The terminal only needs to send two symbols of SRS to the base station to realize the calculation of the uplink transmission delay of the LOS path. Even if the terminal's transmit power is weak, since the transmission path with the strongest signal power is selected as the reference path, the difference between the reference paths of the two symbols can still be obtained. Therefore, it is not necessary to send multiple uplink reference signals, effectively saving resources.

[0077] It is understandable that the reference delay difference, obtained from the reference SRS and the modulated SRS, can be estimated using channel characteristics. The following example illustrates this assuming that both the transmitting and receiving ends use the same transmit and receive beams:

[0078] For the reference SRS, assuming the channel is H(k,l), the reference SRS received by the base station can be expressed as: S rx (k,l ref )=H(k,l ref )·s(k,l ref )+N(k,l ref ), where N(k,l refIf noise and interference are considered, then the estimated channel characteristics of the reference SRS can be expressed as follows: Those skilled in the art will understand that, using the above expression, the uplink reference delay of the reference path can be estimated using methods such as Fourier transform, for example, denoted as τ. Bs,ref .

[0079] For modulated SRS, referring to the above discussion, the signal received by the base station can be expressed as: s rx (k,l)=H(k,l)·s(k,l)·exp(j2πηΔτ los,ref Given kΔf+φ)+N(k,l); then the estimated channel characteristics of the modulated SRS can be expressed as: Using the estimation method described above, the uplink reference delay of the reference path can be estimated as τ. BS,non-ref =τ BS,ref -ηΔτ los,ref .

[0080] Since the reference delay difference on the base station side and the reference delay difference on the terminal side should be the same, Δτ can be derived. los,ref =(τ BS,ref -τ BS,non-ref ) / η, and because Δτ los,ref =τ BS,los -τ BS,ref , where τ Bs,los Let τ be the uplink reference delay for the LOS path. Combining the above expressions, we can obtain: Bs,los =Δτ los,ref +τ BS,ref =(τ BS,ref -τ BS,non-ref ) / η+τ Bs,ref Therefore, it can be seen that directly demodulating to obtain the reference delay difference is quite complex, while according to the above expression, obtaining the reference delay difference can be transformed into calculating τ. Bs,ref -τ BS,non-ref The uplink transmission delay of the reference SRS and the modulated SRS in the reference path is relatively easy to measure since the reference path is the transmission path with the strongest signal power. This allows for the calculation of the uplink transmission delay of the LOS path with only two symbols of SRS, simplifying the measurement process.

[0081] Additionally, refer to Figure 5 In one embodiment, during execution Figure 1 Before step S130 in the illustrated embodiment, the following steps may also be included, but are not limited to:

[0082] Step S510: Determine the receiving beam of the downlink reference signal;

[0083] Step S520: The receiving beam is determined as the transmitting beam for transmitting the uplink reference signal.

[0084] It should be noted that using the same beam in both the uplink and downlink directions ensures that the relative relationships between transmission paths remain as constant as possible. For example, the time delay difference between different paths is the same, and the signal transmission power is similar, reducing measurement errors caused by the beam.

[0085] Additionally, refer to Figure 6 In one embodiment, Figure 1 Step S140 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0086] Step S610: Generate communication signaling carrying the reference delay difference;

[0087] Step S620: Send the communication signaling to the base station.

[0088] It should be noted that since the downlink reference signal received by the terminal side has relatively strong power, the reference delay difference can be measured relatively easily. According to the description in the above embodiments, the reference delay difference between the terminal side and the base station side can be considered the same when the characteristics of the transmission path are the same. Therefore, when signaling resources are sufficient, the reference delay difference can be directly reported to the base station through signaling interaction. After obtaining the reference SRS, the base station obtains the uplink transmission delay of the reference path based on the reference SRS, and then sums the uplink transmission delay and the reference delay difference to obtain the uplink transmission delay of the LOS path.

[0089] Additionally, refer to Figure 7 In one embodiment of the present invention, a transmission delay measurement method is also provided, which is applied to a base station. The transmission delay measurement method includes, but is not limited to, steps S710, S720 and S730.

[0090] Step S710: Send a downlink reference signal to the terminal so that the terminal can determine the LOS path and the reference path from the transmission path of the downlink reference signal;

[0091] Step S720: Obtain the uplink reference signal sent by the terminal, and obtain the uplink transmission delay of the reference path based on the uplink reference signal;

[0092] Step S730: Obtain the reference delay difference reported by the terminal, and obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference, wherein the reference delay difference is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path.

[0093] It should be noted that the base station sending downlink reference signals to the terminal can be triggered by a location request. The location request can be initiated by the base station, the terminal, or the location server. This embodiment does not impose any restrictions on this.

[0094] It should be noted that the method for base station and terminal interaction to achieve uplink transmission delay measurement of LOS path can be found in [reference needed]. Figure 1 The description of the embodiments shown is omitted here for the sake of simplicity.

[0095] It is understandable that although the base station and the terminal can agree on the reporting method of the reference delay difference through configuration information, and thus obtain the uplink transmission delay of the LOS path by combining the uplink transmission delay of the reference path, those skilled in the art are also motivated to configure the base station to first judge the signal strength after receiving the uplink reference signal, for example, by setting a certain power threshold, or by trying to obtain the uplink transmission delay of the LOS path. If the signal strength of the uplink reference signal is sufficient to directly obtain the uplink transmission delay of the LOS path, the uplink transmission delay of the LOS path can be directly obtained according to actual needs. Alternatively, the technical solution of the present invention can still be adopted, combining the uplink transmission delay of the reference path and the reference delay difference to calculate the uplink transmission delay of the LOS path. This embodiment does not impose any limitations on this.

[0096] Additionally, refer to Figure 8 In one embodiment, the uplink reference signal is SRS. Figure 7 Step S720 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0097] Step S810: Obtain the reference SRS sent by the terminal;

[0098] Step S820: Determine the reference path from the transmission path of the reference SRS.

[0099] It should be noted that the method for determining the reference path after the base station receives the SRS can be found in [reference needed]. Figure 3 The description of the embodiments shown is omitted here for the sake of simplicity.

[0100] Additionally, refer to Figure 9 In one embodiment, Figure 7 Step S730 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0101] Step S910: Obtain the modulated SRS and reference SRS sent by the terminal, wherein the modulated SRS is obtained by the terminal from a new reference SRS generated by modulation based on the reference delay difference;

[0102] Step S920: Obtain the reference delay difference based on the modulated SRS and the reference SRS.

[0103] It should be noted that the method for obtaining the reference delay difference based on the modulated SRS and the reference SRS can be found in [reference]. Figure 4 The description of the embodiments shown is omitted here for the sake of simplicity.

[0104] Additionally, refer to Figure 10 In one embodiment, during execution Figure 7 Before step S720 in the illustrated embodiment, the following steps may also be included, but are not limited to:

[0105] Step S1010: Determine the transmit beam for transmitting the downlink reference signal;

[0106] Step S1020: The transmit beam is determined as the receive beam for receiving the uplink reference signal.

[0107] It should be noted that the principle of using the same beam for the uplink reference signal and the downlink reference signal can be found in [reference needed]. Figure 5 The description of the embodiments shown is omitted here for the sake of simplicity.

[0108] Additionally, refer to Figure 11 In one embodiment, Figure 7 Step S730 in the illustrated embodiment also includes, but is not limited to, the following steps:

[0109] Step S1110: Obtain the communication signaling sent by the terminal, wherein the communication signaling carries a reference delay difference.

[0110] It should be noted that the principle of obtaining the reference delay difference through communication signaling can be found in [reference]. Figure 6 The description of the embodiments shown is omitted here for the sake of simplicity.

[0111] In addition, to provide a more detailed explanation of the transmission delay measurement method provided by the present invention, the technical solution of the present invention is described below with two specific examples.

[0112] It should be noted that in the two examples below, the uplink reference signal uses SRS; the reference path is the transmission path with the strongest signal power; at the same time, it can be assumed that the transmit beam and receive beam of the uplink reference signal and the downlink reference signal are the same to ensure that the relative relationship between the transmission paths is the same.

[0113] Example 1: Reporting reference delay difference via modulated SRS, reference Figure 12 The transmission delay measurement method includes, but is not limited to, the following steps:

[0114] Step S1210: The base station sends a downlink positioning reference signal to the terminal;

[0115] Step S1220: The terminal determines the LOS path and the reference path from the transmission path of the downlink positioning reference signal;

[0116] In step S1230, the terminal determines the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path as the reference delay difference.

[0117] Step S1240: The terminal generates two reference SRSs and modulates one of the reference SRSs according to the reference delay difference to obtain the modulated SRS.

[0118] In step S1250, the terminal sends a reference SRS and a modulated SRS to the base station through the beam that receives the downlink positioning reference signal;

[0119] In step S1260, the base station receives the reference SRS and the modulated SRS by transmitting the beam of the downlink positioning reference signal;

[0120] Step S1270: The base station determines the reference path based on the reference SRS;

[0121] In step S1280, the base station obtains the transmission delay difference of the reference path between the modulated SRS and the reference SRS, and calculates the symbol difference to obtain the uplink transmission delay of the LOS path by combining the uplink transmission delay of the reference path in the reference SRS.

[0122] It should be noted that the reference Figure 13 , Figure 13 According to Figure 12 The example shown yields a spectrum in Figure 13 In the diagram, the signal below the noise floor reference line 1330 is the noise floor, which is the waveform formed by noise and interference in the transmission path. Since the base station's transmission power is sufficient, the first signal detected in the spectrum received by the terminal can be determined to be the downlink positioning reference signal transmitted through the LOS path. Figure 13 The first peak point 1311 shown is the signal transmission path corresponding to which can be considered as the LOS path. Meanwhile, the point with the highest signal power is the second peak point 1312. Therefore, the signal transmission path corresponding to the second peak point 1312 is the reference path.

[0123] It is worth noting that in the two symbols sent by the terminal to the base station, symbol 1 in the figure is the reference SRS, and symbol 2 is the modulated SRS. The first peak point 1311 is generated before the second peak point 1312. Since the transmitting and receiving ends use the same beam, it can be assumed that the transmitted signal received by the LOS path at the base station should also be before the reference path. Figure 13As can be seen, for the reference SRS, the point with the strongest signal power is the fourth peak point 1322. The third peak point 1321, which precedes it, is located below the noise floor reference line 1330. That is, the transmission signal of the LOS path has been submerged by noise. Therefore, since the fifth peak point 1323 obtained by modulating the SRS and the fourth peak point 1322 corresponding to the reference SRS correspond to the reference path and are easily detected in the spectrum, the uplink transmission delay of the reference path can be obtained. Then, the uplink transmission delay of the LOS path can be calculated by the method described above. This enables the measurement of the uplink transmission delay of the LOS path using only two symbols of SRS when the terminal power is low, reducing the resource overhead in the RTT measurement process.

[0124] Example 2: Reporting reference delay difference via signaling interaction. Figure 14 The transmission delay measurement method includes, but is not limited to, the following steps:

[0125] Step S1410: The base station sends a downlink positioning reference signal to the terminal;

[0126] Step S1420: The terminal determines the LOS path and the reference path from the transmission path of the downlink positioning reference signal;

[0127] In step S1430, the terminal determines the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path as the reference delay difference, and sends the reference delay difference to the base station through signaling interaction.

[0128] Step S1440: The terminal generates a reference SRS and sends the reference SRS to the base station through the beam that receives the downlink positioning reference signal;

[0129] Step S1450: Receive reference SRS by transmitting downlink positioning reference signal via beam;

[0130] Step S1460: Determine the reference path based on the reference SRS;

[0131] Step S1470: Calculate the uplink transmission delay of the LOS path based on the reference delay difference and the uplink transmission delay of the reference path.

[0132] It should be noted that the reference Figure 15 , Figure 15 According to Figure 14 The example shown yields a spectrum in Figure 15 In the diagram, the signal below the noise floor reference line 1530 is the noise floor, which is the waveform formed by noise and interference in the transmission path. Since the base station's transmission power is sufficient, the first detected signal in the spectrum received by the terminal can be determined to be the downlink positioning reference signal transmitted through the LOS path. Figure 15The first peak point 1511 shown is the signal transmission path corresponding to which can be considered as the LOS path. Meanwhile, the point with the highest signal power is the second peak point 1512. Therefore, the signal transmission path corresponding to the second peak point 1512 is the reference path.

[0133] It is worth noting that in the reference SRS sent from the terminal to the base station, the first peak point 1511 occurs before the second peak point 1512. Since the transmitting and receiving ends use the same beam, it can be assumed that the transmitted signal received by the LOS path at the base station should also occur before the reference path. Figure 15 As can be seen from the data, for the reference SRS, the point with the strongest signal power is the fourth peak point 1522. The third peak point 1521, which precedes it, is located below the noise floor reference line 1530. That is, the transmission signal of the LOS path has been submerged by noise. Since the fourth peak point 1522 is easy to detect in the spectrum, the uplink transmission delay of the reference path can be obtained. Then, the reference delay difference can be obtained through signaling interaction, and the uplink transmission delay of the LOS path can be calculated, reducing the resource overhead in the RTT measurement process.

[0134] In addition, a positioning method is also provided with reference to the embodiments of the present invention, which is applied to a positioning server. The positioning server is communicatively connected to a base station and a terminal. The positioning method includes, but is not limited to, steps S1610 and S1620.

[0135] Step S1610: Obtain the downlink transmission delay of the LOS path sent by the terminal and the uplink transmission delay of the LOS path sent by the base station, wherein the uplink transmission delay of the LOS path is determined according to... Figure 1 The transmission delay measurement method of the illustrated embodiment is obtained, or, according to Figure 7 The transmission delay measurement method provided in the illustrated embodiment is obtained.

[0136] Step S1620: Determine the terminal's location information based on the downlink transmission delay and uplink transmission delay of the LOS path.

[0137] It should be noted that the uplink transmission latency of the LOS path can be referenced. Figure 1 or Figure 8 The method of the illustrated embodiment will not be described in detail here for the sake of simplicity.

[0138] It should be noted that the location request can be initiated by the location server, the terminal, or the base station; this embodiment does not impose any limitations on this. After a location request is generated, both the terminal and the base station need to report the transmission delay of the LOS path to the location server. This is because a method is used... Figure 1 or Figure 8The method of the illustrated embodiment for measuring transmission delay not only reduces resource overhead, but also effectively improves measurement efficiency because it only requires a maximum of two symbols of SRS to complete the measurement of uplink transmission delay of the LOS path. It eliminates the need to wait for the transmission and reception of multiple SRS, thereby achieving rapid positioning.

[0139] It is understandable that after the positioning server receives the downlink transmission delay and uplink transmission delay of the LOS path, it can determine the location information of the terminal in any way, such as the RTT measurement method specified in the relevant standards. This embodiment does not impose any restrictions on this.

[0140] Additionally, refer to Figure 17 An embodiment of the present invention also provides a terminal 1700, which includes a memory 1710, a processor 1720, and a computer program stored in the memory 1710 and executable on the processor 1720.

[0141] The processor 1720 and memory 1710 can be connected via a bus or other means.

[0142] The non-transient software program and instructions required to implement the transmission delay measurement method of the above embodiments are stored in the memory 1710. When executed by the processor 1720, the transmission delay measurement method applied to the terminal 1700 in the above embodiments is executed, for example, the method described above is executed. Figure 1 Method steps S110 to S140 in the middle Figure 2 Method steps S210 to S220 in the middle Figure 3 Method steps S310 to S320 in the middle Figure 4 Method steps S410 to S420 in the middle Figure 5 Method steps S510 to S520 in the middle Figure 6 Method steps S610 to S620.

[0143] Additionally, refer to Figure 18 An embodiment of the present invention also provides a base station 1800, which includes: a memory 1810, a processor 1820, and a computer program stored in the memory 1810 and executable on the processor 1820.

[0144] The processor 1820 and memory 1810 can be connected via a bus or other means.

[0145] The non-transient software program and instructions required to implement the transmission delay measurement method of the above embodiments are stored in the memory 1810. When executed by the processor 1820, the transmission delay measurement method applied to the base station 1800 in the above embodiments is executed, for example, the method described above is executed. Figure 7 Method steps S710 to S730, Figure 8 Method steps S810 to S820 Figure 9 Method steps S910 to S920 Figure 10 Method steps S1010 to S1020 Figure 11 Method step S1110.

[0146] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0147] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller, for example, by a processor in the above-described terminal embodiment, causing the processor to perform the transmission delay measurement method applied to the terminal in the above-described embodiment, for example, performing the above-described... Figure 1 Method steps S110 to S140 in the middle Figure 2 Method steps S210 to S220 in the middle Figure 3 Method steps S310 to S320 in the middle Figure 4 Method steps S410 to S420 in the middle Figure 5 Method steps S510 to S520 in the middle Figure 6 Method steps S610 to S620; for example, if executed by a processor in the above base station embodiment, the processor can execute the transmission delay measurement method applied to the base station in the above embodiment, for example, executing the method described above. Figure 7 Method steps S710 to S730, Figure 8 Method steps S810 to S820 Figure 9 Method steps S910 to S920 Figure 10 Method steps S1010 to S1020 Figure 11Method step S1110. Those skilled in the art will understand that all or some of the steps and systems disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0148] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A transmission delay measurement method, applied to a terminal, comprising: Obtain the downlink reference signal sent by the base station, and determine the line-of-sight (LOS) path and reference path from the transmission path of the downlink reference signal; Obtain a reference delay difference, which is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path; An uplink reference signal is sent to the base station, and the uplink reference signal is used by the base station to obtain the uplink transmission delay of the reference path; The reference delay difference is reported to the base station, and the reference delay difference is used by the base station to obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference. The uplink reference signal is a channel sounding signal (SRS), and sending the uplink reference signal to the base station includes: Generate reference SRS; The reference SRS is sent to the base station. The reference SRS is used by the base station to determine the reference path from the transmission path of the reference SRS and to obtain the uplink transmission delay of the reference path.

2. The method according to claim 1, characterized in that, Determining the LOS path and reference path from the transmission path of the downlink reference signal includes: The transmission path that first completes the transmission of the downlink reference signal is determined as the LOS path; The signal reception power of the transmission path of the downlink reference signal is determined, and the reference path is determined based on the signal reception power, wherein the signal reception power of the reference path is greater than or equal to the signal reception power of the LOS path.

3. The method according to claim 1, characterized in that, The step of reporting the reference delay difference to the base station includes: A new reference SRS is generated, and the new reference SRS is modulated according to the reference delay difference to obtain a modulated SRS; The modulation SRS is transmitted to the base station, and the modulation SRS is used for: the base station to obtain the reference delay difference based on the modulation SRS and the reference SRS, and to obtain the uplink transmission delay of the LOS path based on the uplink transmission delay of the reference path and the reference delay difference.

4. The method according to claim 1, characterized in that, Before sending the uplink reference signal to the base station, the method further includes: Determine the receiving beam of the downlink reference signal; The receiving beam is determined as the transmitting beam for transmitting the uplink reference signal.

5. The method according to claim 1, characterized in that, The step of reporting the reference delay difference to the base station includes: Generate communication signaling carrying the reference delay difference; The communication signaling is sent to the base station.

6. A transmission delay measurement method, applied to a base station, comprising: Send a downlink reference signal to the terminal, the downlink reference signal being used by the terminal to determine the LOS path and the reference path from the transmission path of the downlink reference signal; Obtain the uplink reference signal sent by the terminal, and obtain the uplink transmission delay of the reference path based on the uplink reference signal; The reference delay difference reported by the terminal is obtained, and the uplink transmission delay of the LOS path is obtained based on the uplink transmission delay of the reference path and the reference delay difference, wherein the reference delay difference is the difference between the downlink transmission delay of the LOS path and the downlink transmission delay of the reference path. The uplink reference signal is SRS. The step of obtaining the uplink reference signal sent by the terminal and obtaining the uplink transmission delay of the reference path based on the uplink reference signal includes: Obtain the reference SRS sent by the terminal; The reference path is determined from the transmission path of the reference SRS, and the uplink transmission delay of the reference path is obtained.

7. The method according to claim 6, characterized in that, The step of obtaining the reference delay difference reported by the terminal includes: The modulated SRS and reference SRS transmitted by the terminal are obtained, wherein the modulated SRS is obtained by the terminal from a new reference SRS generated by modulation based on the reference delay difference; The reference delay difference is obtained based on the modulated SRS and the reference SRS.

8. The method according to claim 6, characterized in that, Before acquiring the uplink reference signal sent by the terminal, the method further includes: Determine the transmit beam used to transmit the downlink reference signal; The transmit beam is determined as the receive beam for receiving the uplink reference signal.

9. The method according to claim 6, characterized in that, The step of obtaining the reference delay difference reported by the terminal includes: Obtain the communication signaling sent by the terminal, wherein the communication signaling carries the reference delay difference.

10. A positioning method applied to a positioning server, the positioning server being communicatively connected to a base station and a terminal, the positioning method comprising: The downlink transmission delay of the LOS path sent by the terminal and the uplink transmission delay of the LOS path sent by the base station are obtained, wherein the uplink transmission delay of the LOS path is obtained by the transmission delay measurement method according to any one of claims 1 to 5, or by the transmission delay measurement method according to any one of claims 6 to 9. The location information of the terminal is determined based on the downlink transmission delay and uplink transmission delay of the LOS path.

11. A terminal, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the computer program, it implements the transmission delay measurement method as described in any one of claims 1 to 5.

12. A base station, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the computer program, it implements the transmission delay measurement method as described in any one of claims 6 to 9.

13. A computer-readable storage medium storing computer-executable instructions for performing the transmission delay measurement method as described in any one of claims 1 to 5, or for performing the transmission delay measurement method as described in any one of claims 6 to 9.

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