CN110475339B - Time difference of arrival positioning method and device - Google Patents
Time difference of arrival positioning method and device Download PDFInfo
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- CN110475339B CN110475339B CN201910902563.2A CN201910902563A CN110475339B CN 110475339 B CN110475339 B CN 110475339B CN 201910902563 A CN201910902563 A CN 201910902563A CN 110475339 B CN110475339 B CN 110475339B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W64/00—Locating users or terminals or network equipment for network management purposes, e.g. mobility management
- H04W64/006—Locating users or terminals or network equipment for network management purposes, e.g. mobility management with additional information processing, e.g. for direction or speed determination
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
A time difference of arrival positioning method and device, the time difference of arrival positioning method comprises: a terminal acquires data from a network side, wherein the data comprises a list of a reference cell and a neighbor cell; storing time domain data, wherein the time domain data comprises corresponding positioning subframes of at least one part of cells in a reference cell and a neighbor cell, and the positioning subframes comprise positioning reference signals; detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating the power time delay distribution of the detected cell under each phase by referring to the positioning reference signals corresponding to the different time domain phases; and analyzing the power time delay distribution to obtain the arrival time difference between the positioning reference signal of the adjacent cell and the terminal compared with the positioning reference signal of the reference cell. The time difference of arrival positioning method and device can improve the positioning accuracy.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a time difference of arrival positioning method and apparatus.
Background
The Time Difference of Arrival (OTDOA) is a technique for performing positioning based on the Difference between the propagation times of signals from at least three base stations to a mobile terminal. The terminal respectively measures the arrival time difference between each adjacent cell and the terminal compared with the reference cell, and when all the adjacent cells are measured or the specified time expires, the terminal finally reports the measurement result of the arrival time difference to the positioning server, the positioning server estimates the distance difference of the terminal arriving at two different base stations, and the intersection point of different hyperbolas formed by at least three base stations is the estimated terminal position.
The accuracy of the existing time difference of arrival positioning method needs to be improved.
Disclosure of Invention
The invention solves the technical problem of improving the accuracy of the time difference of arrival positioning method.
To solve the above technical problem, an embodiment of the present invention provides a time difference of arrival positioning method, including:
a terminal acquires data from a network side, wherein the data comprises a list of a reference cell and a neighbor cell;
storing time domain data, wherein the time domain data comprises corresponding positioning subframes of at least one part of cells in a reference cell and a neighbor cell, and the positioning subframes comprise positioning reference signals;
detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating the power time delay distribution of the detected cell under each time domain phase by referring to the positioning reference signals corresponding to the different time domain phases;
and analyzing the power time delay distribution to obtain the arrival time difference between the positioning reference signal of the adjacent cell and the terminal compared with the positioning reference signal of the reference cell.
Optionally, the storing the time domain data includes:
detecting the starting position of the positioning subframe;
analyzing the list of the reference cell and the adjacent cell, and determining the frame length of the time domain data to be stored;
and storing time domain data with the starting position as a starting point and the length as the frame length.
Optionally, the calculating, with reference to the positioning reference signals corresponding to the different time domain phases, power delay distribution of the detected cell in each time domain phase includes:
attempting a plurality of different time domain phases to obtain first time domain data of the positioning reference signal from the time domain data;
transforming the first time domain data under different time domain phases to obtain first frequency domain data;
detecting a positioning reference signal of each cell in the first frequency domain data;
and calculating the power time delay distribution of the positioning reference signals according to the detected positioning reference signals of each cell.
Optionally, the calculating the power delay distribution of the detected cell according to the detected positioning reference signals of each cell includes:
combining positioning reference signals in the first frequency domain data between different symbols within one subframe;
and transforming the combined positioning reference signal to a time domain, and calculating the power time delay distribution of the corresponding cell in the time domain.
Optionally, if there are the positioning reference signals corresponding to multiple subframes of the same cell, the power delay distributions among the multiple subframes may be incoherently combined to obtain a combined power delay distribution.
Optionally, the data further includes a reference signal time difference uncertainty, and the number of attempts of the different time domain phases is determined in the following manner: and obtaining the trial times of different time domain phases according to the quotient of the uncertainty of the time difference of the positioning reference signal and a preset trial interval.
Optionally, the time difference of arrival positioning method further includes: descrambling the positioning reference signal is carried out for a plurality of times within the range of the subframe ambiguity of the positioning reference signal.
Optionally, when the terminal includes multiple receiving antennas, the calculating the power delay distribution of the detected cell in each phase includes: and incoherently combining the power delay distribution corresponding to the plurality of receiving antennas.
Optionally, the analyzing the power delay distribution to obtain an arrival time difference between the positioning reference signal of the neighboring cell and the positioning reference signal of the reference cell to the terminal includes:
for each cell, analyzing the power delay distribution of the positioning reference signals under different time domain phases, and determining the optimal power delay distribution;
and carrying out interpolation filtering on the optimal power time delay distribution of each cell, and calculating the arrival time difference according to the result of the interpolation filtering.
An embodiment of the present invention further provides a time difference of arrival positioning apparatus, including: the device comprises a network side data acquisition unit, a storage unit, a power time delay distribution calculation unit and an arrival time difference generation unit; wherein:
the network side data acquisition unit is suitable for acquiring data from a network side, wherein the data comprises a list of a reference cell and a neighbor cell;
the storage unit is suitable for storing time domain data, the time domain data comprises corresponding positioning subframes of at least one part of cells in a reference cell and a neighbor cell, and the positioning subframes comprise positioning reference signals;
the power time delay distribution calculating unit is suitable for detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating to obtain the power time delay distribution of the detected cell under each phase by referring to the positioning reference signals corresponding to the different time domain phases;
the time difference of arrival generating unit is adapted to analyze the power delay distribution to obtain a time difference of arrival from the positioning reference signal of the neighboring cell to the terminal compared to the positioning reference signal of the reference cell.
Optionally, the storage unit includes: the device comprises a starting position detection unit, a length determination unit and a data storage unit; wherein:
the starting position detection unit is suitable for detecting the starting position of the positioning subframe;
the length determining unit is adapted to analyze the list of the reference cell and the neighboring cell and determine the frame length of the time domain data to be stored;
the data storage unit is suitable for storing time domain data with the starting position as a starting point and the length as the frame length.
Optionally, the power delay profile calculating unit includes: the system comprises a first time domain data acquisition unit, a first frequency domain data generation unit, a cell signal detection unit and a power time delay distribution generation unit; wherein:
the first time domain data acquisition unit is suitable for trying a plurality of different time domain phases so as to acquire first time domain data of the positioning reference signal from the time domain data;
the first frequency domain data generating unit is suitable for transforming the first time domain data under different time domain phases to obtain first frequency domain data;
the cell signal detection unit is adapted to detect a positioning reference signal of each cell in the first frequency domain data;
the power time delay distribution generating unit is adapted to calculate the power time delay distribution corresponding to each cell according to the detected positioning reference signal of each cell.
Optionally, the power delay profile generating unit includes: a merging unit and a generating unit; wherein the merging unit is adapted to merge positioning reference signals in the first frequency domain data between different symbols within one subframe; the generating unit is adapted to transform the combined positioning reference signal into a time domain, and calculate power delay distribution of a corresponding cell in the time domain.
Optionally, the delay profile calculating unit further includes a non-coherent combining unit, adapted to perform non-coherent combining on the power delay profiles between the multiple subframes when the positioning reference signals of the multiple subframes exist, so as to obtain a combined power delay profile.
Optionally, the data further comprises a reference signal time difference uncertainty; the first time domain data acquisition unit is suitable for obtaining the trial times of different time domain phases according to the quotient of the uncertainty of the time difference of the positioning reference signal and a preset trial interval.
Optionally, the power delay profile calculating unit further includes a descrambling unit, and is adapted to perform descrambling on the positioning reference signal multiple times within a range of subframe ambiguity of the positioning reference signal.
Optionally, the power delay profile calculating unit is further adapted to incoherently combine the power delay profiles corresponding to the multiple receiving antennas.
Optionally, the arrival time difference generating unit is adapted to perform interpolation filtering on the optimal power delay distribution of each cell, and calculate the arrival time difference according to a result of the interpolation filtering.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
because the existing time difference of arrival positioning method measures the positioning reference signal according to the time sequence of the serving cell, when the time difference of arrival of the serving cell and the adjacent cell is larger, the number of symbols of the available positioning reference signal of the adjacent cell is reduced, thereby affecting the measurement quality. The embodiment of the invention stores the time domain data of the corresponding positioning subframes of at least one part of the cells including the reference cell and the adjacent cell, performs off-line analysis on the related time domain data, can store the positioning subframes corresponding to the cells without considering the time sequence of the service cell, and can fully utilize all position reference information numbers in a measurement scene, thereby improving the measurement precision.
Drawings
FIG. 1 is a flow chart of a time difference of arrival location method in an embodiment of the present invention;
FIG. 2 is a detailed flow chart of the method for storing time domain data in the time difference of arrival location shown in FIG. 1;
FIG. 3 is a detailed flow chart of the calculation of a power delay profile in the time difference of arrival location method of FIG. 1;
fig. 4 is a detailed flowchart of step S14 in the time difference of arrival localization method shown in fig. 1;
FIG. 5 is a flow chart of another time difference of arrival location method in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a time difference of arrival positioning apparatus according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a specific structure of a memory cell in the TDOA apparatus shown in FIG. 6;
fig. 8 is a schematic diagram showing a specific configuration of a power delay profile calculation unit in the time difference of arrival positioning apparatus shown in fig. 6.
Detailed Description
As described above, the Time Difference of Arrival (OTDOA) is a technique for performing positioning based on the Difference between the propagation times of signals from at least three base stations to a mobile terminal. The terminal respectively measures the arrival time difference between each adjacent cell and the terminal compared with the reference cell, and when all the adjacent cells are measured or the specified time expires, the terminal finally reports the measurement result of the arrival time difference to the positioning server, the positioning server estimates the distance difference of the terminal arriving at two different base stations, and the intersection point of different hyperbolas formed by at least three base stations is the estimated terminal position. The accuracy of the existing time difference of arrival positioning method needs to be improved.
Because the existing time difference of arrival positioning method measures the positioning reference signal according to the time sequence of the serving cell, when the time difference of arrival of the serving cell and the adjacent cell is larger, the number of symbols of the available positioning reference signal of the adjacent cell is reduced, thereby affecting the measurement quality.
The embodiment of the invention stores the time domain data of the corresponding positioning subframe of at least one part of the cells including the reference cell and the adjacent cell, carries out off-line analysis on the relevant time domain data, and does not need to consider the time sequence of the service cell, thereby fully utilizing all position reference information numbers in a measurement scene, and improving the measurement precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart of a time difference of arrival positioning method according to an embodiment of the present invention.
S11, the terminal obtains data from the network side, where the data includes a list of reference cells and neighbor cells.
The information which is sent by the network side and contains the list of the pre-configured reference cell and the adjacent cell can be sent by a positioning server, and the positioning server can be integrated in a base station for example; the terminal may be a mobile communication device, may be a mobile phone, a wearable device, or the like.
S12, storing time domain data, where the time domain data includes positioning subframes corresponding to at least some of the reference cell and the neighboring cells, and the positioning subframes include positioning reference signals.
Because the positioning reference signals of the reference cell and the adjacent cell are aliased in the time domain, the terminal can store the time domain data of the reference cell and the adjacent cell in a proper time range at one time according to the requirement; or dividing the time domain data in the proper time range into time periods, and storing the positioning subframe time domain data for multiple times. Further, within the suitable time range, corresponding positioning subframes of the reference cell and the neighboring cell are stored, which refer to the respective positioning subframes for time difference of arrival positioning in the reference cell and the neighboring cell.
The positioning subframe includes a positioning reference signal, and because the distance from the terminal to the reference cell and each neighboring cell is different, the time for the positioning subframe of the reference cell and the neighboring cell to reach the terminal is different.
The reference cell may be a serving cell or a neighbor cell. In the prior art, the measurement of the positioning reference signals of the reference cell and the neighboring cell is performed in the time sequence of the serving cell, and when the arrival time difference between the neighboring cell and the serving cell is large, the positioning reference signals of only part of the positioning subframes of the neighboring cell can be obtained, and the accuracy of the arrival time difference positioning method needs to be improved. In this embodiment, the corresponding positioning subframe is completely stored, so that the subsequent positioning calculation is more accurate, which is described in detail below.
In a specific implementation, the flow of storing time domain data may be as shown in fig. 2.
And S121, detecting the initial position of the positioning subframe.
For example, the start position of the positioning subframe may be determined by determining the frame header.
And S122, analyzing the list of the reference cell and the adjacent cell, and determining the frame length of the time domain data to be stored.
Since signals of the reference cell and the neighboring cell are aliased, the frame length of the time domain data needs to comprehensively consider the relevant cells in the measurement scenario. The frame length finally stored is not necessarily an integer multiple of the unit frame length, taking into account the time difference between the arrival of the signal at the terminal in each cell.
And S123, storing time domain data with the starting position as a starting point and the length as the frame length.
By completely storing the positioning subframes corresponding to the reference cell and the adjacent cell, the positioning reference signals in the positioning subframes can be fully utilized, so that the accuracy of the time difference of arrival positioning method is improved.
In a specific implementation, the time domain data including 6 subframes is stored when the bandwidth is 1.4MHz, the time domain data including 4 subframes is stored when the bandwidth is 3MHz, the time domain data including 2 subframes is stored when the bandwidth is 5MHz, and the time domain data including 1 subframe is stored when the bandwidth is greater than 5 MHz.
And S13, detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating the power time delay distribution of the detected cell under each time domain phase by referring to the positioning reference signals corresponding to the different time domain phases.
And positioning reference signals are respectively arranged in the corresponding reference cell and the adjacent cell, and time domain data are detected by using different time domain phases. Because the detection results obtained by using different time domain phases are different, the obtained power delay distribution is also different, and for the positioning reference signals of each cell, the power delay distribution of each cell can be calculated according to the positioning reference signals obtained by detection under different time domain phases.
In a specific implementation, referring to the positioning reference signals corresponding to the different time domain phases, a specific process of calculating the power delay distribution of the detected cell in each phase may be as shown in fig. 3.
S131, try a plurality of different time domain phases to obtain the first time domain data of the positioning reference signal from the time domain data.
In a specific implementation, the number of attempts of the different time domain phases may be determined as follows: and obtaining the trial times of different time domain phases according to the quotient of the uncertainty of the time difference of the positioning reference signal and a preset trial interval.
For example, if the uncertainty of the Expected positioning reference signal propagation time difference (Expected _ RSTD _ uncertainty) of a certain neighboring cell is 1500Ts, and the time domain trial phase interval is 500Ts, then 3 trials are performed in the time domain to measure the cell.
S132, the first time domain data under different time domain phases are transformed to obtain first frequency domain data.
In a specific implementation, the transforming the first time domain data may be an FFT transform.
S133, detecting a positioning reference signal of each cell in the first frequency domain data.
Since the positioning reference signals of the cells in the stored time domain data are aliased, after the first time domain data is transformed, the positioning reference signals of the cells can be detected in the first frequency domain data, and the frequency domain data corresponding to the positioning reference signals of the cells is obtained.
In a specific implementation, after step S133, the positioning reference signal may also be descrambled. When descrambling the positioning reference signal, the subframe number of the positioning subframe needs to be utilized.
The positioning Subframe Offset (PRS _ Subframe Offset) in the assistance information in the list of cells will have an ambiguity of one Subframe, i.e. if the Subframe number obtained from the network side is 7, but the actual Subframe number may be 6 or 7 or 8. Therefore, when descrambling the positioning reference signal, the ambiguity of the subframe needs to be considered, and the positioning reference signal is descrambled by using the subframe number configured at the network side and the subframe numbers adjacent to each other in the front and the back, so as to obtain different descrambling results.
And S134, calculating power time delay distribution corresponding to each cell according to the detected positioning reference signals of each cell.
Since the first time domain data is obtained by measuring a plurality of different time domain phases, after the first time domain data is transformed to obtain the first frequency domain data, the first frequency domain data is subjected to frequency domain detection of the positioning reference signal, and corresponding to each cell, a plurality of kinds of frequency domain data can be obtained.
And transforming the multiple frequency domain data obtained corresponding to each cell into a time domain to obtain second time domain data, and obtaining power time delay distribution corresponding to each cell according to the transformed second time domain data.
In a specific implementation, calculating the power delay distribution corresponding to each cell according to the detected positioning reference signal of each cell may include: combining positioning reference signals in the first frequency domain data between different symbols within one subframe; and transforming the combined positioning reference signal into a time domain to obtain corresponding power time delay distribution. The transformation into the time domain may be an IFFT transformation.
In a specific implementation, if there are the positioning reference signals corresponding to multiple subframes of the same cell, the power delay distributions among the multiple subframes may be incoherently combined to obtain a combined power delay distribution.
In one implementation, when the descrambling takes into account subframe ambiguity, the power delay profile for each cell further includes different power delay profiles for different descrambling results.
In another implementation, when the terminal includes multiple receiving antennas, calculating the power delay distribution of the detected cell at each phase includes: and incoherently combining the power delay distribution corresponding to the plurality of receiving antennas.
S14, analyzing the power delay distribution to obtain an arrival time difference between the positioning reference signal of the neighboring cell and the terminal compared to the positioning reference signal of the reference cell.
The arrival time of the positioning reference signals of the adjacent cell and the reference cell can be determined through power time delay distribution, and the arrival time difference from the positioning reference signal of the adjacent cell to the terminal compared with the positioning reference signal of the reference cell is calculated.
Because the number sum of the reference cell and the adjacent cell is more than three, the intersection point of different curves formed by at least three base stations is the estimated terminal position, and therefore the positioning of the terminal can be realized.
In a specific implementation, step S14 may include the steps shown in fig. 4.
And S141, analyzing the power delay distribution under different time domain phases for each cell, and determining the optimal power delay distribution.
In one implementation, different time domain phases may also correspond to different descrambling results, with multiple power delay distributions for each cell. According to the quality of the power delay profile, the optimal power delay profile for each cell can be finally determined.
And S142, performing interpolation filtering on the optimal power delay distribution of each cell, and calculating the arrival time difference according to the result of the interpolation filtering.
By performing interpolation filtering on the power time delay distribution, the data precision is improved, and the precision and the accuracy of the time difference of arrival positioning method are further improved. The interpolation filtering is only carried out on the neighbor cell positioning reference signal data with the power larger than the threshold value, but not all the data, so that the calculation amount can be reduced, and the expense on terminal hardware is reduced. Interpolation filtering is carried out on the optimal power delay distribution of each cell, and the arrival time difference is calculated according to the interpolation filtering result, so that the accuracy of the arrival time difference can be improved.
The interpolation filtering may be performed according to the following equation:
wherein:
n is the number of raw data points, M is a multiple of interpolation, and x (N) is the data in the power delay distribution.
Fig. 5 is a flow chart of another time difference of arrival location method in an embodiment of the present invention.
S51, storing time domain data, where the time domain data includes positioning subframes corresponding to at least some of the reference cell and the neighboring cells, and the positioning subframes include positioning reference signals.
For a specific implementation of step S51, refer to step S12, which is not described herein.
S52, determining whether the positioning reference signal detection on the time domain data by using the time domain phase is completed, if so, executing step S510; otherwise, step S53 is executed.
S53, transforming the first time domain data detected by the current phase to obtain first frequency domain data.
The specific implementation of step S53 can be referred to the implementation of step S132 in fig. 3, which is not described in detail herein.
S54, determining whether the detection of the positioning reference signals of all cells in the first frequency domain data corresponding to the current phase detection is completed, if so, executing step S55, otherwise, executing step S56.
The specific implementation of step S54 can be referred to the implementation of step S132 in fig. 3, which is not described in detail herein.
And S55, detecting the positioning reference signal by using the next phase to the time domain data.
The detection of the positioning reference signal by using different time-domain phases to the time-domain data can be seen in step S131. After step S55 is performed, step S52 is re-performed.
And S56, judging whether the descrambling of the positioning reference signal in the subframe ambiguity range is finished. If descrambling is completed, step S57 is performed, otherwise, step S58 is performed.
The specific implementation of descrambling is described in the foregoing description, and is not described in detail here.
S57, performing positioning reference signal detection on the next cell in the first frequency domain data corresponding to the current phase detection. After the execution of step S57 is completed, step S54 is re-executed.
S58, generating power time delay distribution according to the descrambled signal of the current phase of the current cell; and updating the power delay distribution of the current cell.
Because subframe ambiguity may occur, frequency domain data corresponding to the positioning reference signal needs to be descrambled for multiple times; because different time domain data can be obtained by utilizing different phases for measurement, and different positioning reference signals corresponding to each cell can be obtained by analyzing the different time domain data, a plurality of descrambling processes are available.
For the descrambled signal of the current cell in the current phase, the corresponding frequency domain data can be transformed into the time domain, and corresponding power delay distribution is generated. After generating the new power delay distribution, denoising processing may be performed, power delay distributions corresponding to different antennas are combined, and the quality of each power delay distribution corresponding to each cell is compared to update the power delay distribution.
And S59, entering the descrambling process corresponding to the next ambiguity.
After step S59 is executed, step S56 is executed again.
And S510, carrying out interpolation filtering on the power time delay distribution of each cell.
S511, calculating the time difference between the positioning reference signal of the neighboring cell and the arrival time of the terminal compared to the positioning reference signal of the reference cell.
It is to be understood that the first time domain data and the "first" in the first frequency domain data are only used for distinguishing and do not limit the data property.
Because the existing time difference of arrival positioning method measures the positioning reference signal according to the time sequence of the serving cell, when the time difference of arrival of the serving cell and the adjacent cell is larger, the number of symbols of the available positioning reference signal of the adjacent cell is reduced, thereby affecting the measurement quality. According to the embodiment of the invention, the time domain data of the corresponding positioning subframe of at least one part of the reference cell and the adjacent cell is stored, and the related time domain data is analyzed in an off-line manner, so that the time sequence of the service cell does not need to be considered; and storing the positioning subframes corresponding to the cells, so that all position reference information numbers in one measurement scene can be fully utilized, and the measurement precision can be improved.
Referring to fig. 6, an embodiment of the present invention further provides a time difference of arrival positioning apparatus, including: a network side data acquisition unit 61, a storage unit 62, a power delay distribution calculation unit 63, and an arrival time difference generation unit 64; wherein:
the network side data obtaining unit 61 is adapted to obtain data from the network side, where the data includes a list of reference cells and neighbor cells;
the storage unit 62 is adapted to store time domain data, where the time domain data includes corresponding positioning subframes of at least some of the reference cell and the neighboring cells, and the positioning subframes include positioning reference signals;
the power delay distribution calculating unit 63 is adapted to detect the time domain data by using a plurality of different time domain phases, and calculate the power delay distribution of the detected cell in each phase;
the time difference of arrival generating unit 64 is adapted to analyze the power delay distribution to obtain the time difference of arrival from the positioning reference signal of the neighboring cell to the terminal compared to the positioning reference signal of the reference cell.
In a specific implementation, the power delay profile calculation unit 63 includes: a merging unit and a generating unit (not shown); wherein the merging unit is adapted to merge positioning reference signals in the first frequency domain data between different symbols within one subframe; the generating unit is adapted to transform the combined positioning reference signal into a time domain, and calculate power delay distribution of a corresponding cell in the time domain.
In a specific implementation, the power delay profile calculating unit 63 may further include a non-coherent combining unit, adapted to perform non-coherent combining on the power delay profiles between multiple subframes when the positioning reference signals of multiple subframes exist, so as to obtain a combined power delay profile.
In a specific implementation, referring to fig. 7, the storage unit 62 may include: a start position detection unit 71, a length determination unit 72, and a data storage unit 73; wherein:
the start position detection unit 71 is adapted to detect a start position of the positioning subframe;
the length determining unit 72 is adapted to analyze the list of the reference cell and the neighboring cell and determine a frame length of the time domain data to be stored;
the data storage unit 73 is adapted to store time domain data with the start position as a start point and the length of the frame length.
In a specific implementation, referring to fig. 8, the power delay profile calculation unit 63 may include: a first time domain data acquisition unit 81, a first frequency domain data generation unit 82, a cell signal detection unit 83, and a power delay distribution generation unit 84; wherein:
the first time domain data obtaining unit 81 is adapted to try a plurality of different time domain phases to obtain the first time domain data of the positioning reference signal from the time domain data;
the first frequency domain data generating unit 82 is adapted to transform the first time domain data in each of the different time domain phases to obtain first frequency domain data;
the cell signal detection unit 83 is adapted to detect the positioning reference signal of each cell in the first frequency domain data;
the power delay profile generating unit 84 is adapted to calculate, according to the detected positioning reference signals of the cells, power delay profiles respectively corresponding to the cells.
In particular implementations, the data may also include a reference signal time difference uncertainty; the first time domain data acquisition unit is suitable for obtaining the trial times of different time domain phases according to the quotient of the uncertainty of the time difference of the positioning reference signal and a preset trial interval. The reference signal time difference uncertainty may be obtained from secondary measurement information provided by the network side.
In a specific implementation, the power delay profile calculation unit 63 may further include a descrambling unit (not shown) adapted to perform descrambling of the positioning reference signal multiple times within a range of subframe ambiguity of the positioning reference signal.
In a specific implementation, the power delay profile calculating unit 63 is further adapted to incoherently combine the power delay profiles corresponding to the multiple receiving antennas.
In a specific implementation, the time difference of arrival generating unit 64 is adapted to perform interpolation filtering on the optimal power delay distribution of each cell, and calculate the time difference of arrival according to the result of the interpolation filtering.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A time difference of arrival location method, comprising:
a terminal acquires data from a network side, wherein the data comprises a list of a reference cell and a neighbor cell;
storing time domain data, wherein the time domain data comprises corresponding positioning subframes of at least one part of cells in a reference cell and a neighbor cell, and the positioning subframes comprise positioning reference signals;
detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating the power time delay distribution of the detected cell under each time domain phase by referring to the positioning reference signals corresponding to the different time domain phases;
analyzing the power time delay distribution to obtain the arrival time difference between the positioning reference signal of the adjacent cell and the terminal compared with the positioning reference signal of the reference cell;
wherein the storing time domain data comprises:
detecting the starting position of the positioning subframe;
analyzing the list of the reference cell and the adjacent cell, and determining the frame length of the time domain data to be stored;
storing time domain data with the starting position as a starting point and the length as the frame length;
and completely storing the positioning subframes corresponding to the reference cell and the adjacent cell by taking the initial position as a starting point and time domain data with the length of the frame length as a starting point.
2. The method of claim 1, wherein when the terminal includes a plurality of receiving antennas, the calculating the power delay distribution of the detected cell at each phase comprises: and incoherently combining the power delay distribution corresponding to the plurality of receiving antennas.
3. The method of claim 1, wherein the analyzing the power delay distribution to obtain the arrival time difference between the positioning reference signal of the neighboring cell and the positioning reference signal of the reference cell to the terminal comprises:
analyzing power delay distribution under different time domain phases for each cell, and determining optimal power delay distribution;
and carrying out interpolation filtering on the optimal power time delay distribution of each cell, and calculating the arrival time difference according to the result of the interpolation filtering.
4. A time difference of arrival positioning apparatus, comprising: the device comprises a network side data acquisition unit, a storage unit, a power time delay distribution calculation unit and an arrival time difference generation unit; wherein:
the network side data acquisition unit is suitable for acquiring data from a network side, wherein the data comprises a list of a reference cell and a neighbor cell;
the storage unit is suitable for storing time domain data, the time domain data comprises corresponding positioning subframes of at least one part of cells in a reference cell and a neighbor cell, and the positioning subframes comprise positioning reference signals;
the power time delay distribution calculating unit is suitable for detecting the time domain data by using a plurality of different time domain phases to obtain positioning reference signals corresponding to the different time domain phases, and calculating to obtain the power time delay distribution of the detected cell under each time domain phase by referring to the positioning reference signals corresponding to the different time domain phases;
the time difference of arrival generating unit is adapted to analyze the power delay distribution to obtain a time difference of arrival from the positioning reference signal of the neighboring cell to the terminal compared to the positioning reference signal of the reference cell;
the memory cell includes: the device comprises a starting position detection unit, a length determination unit and a data storage unit; wherein:
the starting position detection unit is suitable for detecting the starting position of the positioning subframe;
the length determining unit is adapted to analyze the list of the reference cell and the neighboring cell and determine the frame length of the time domain data to be stored;
the data storage unit is suitable for storing time domain data with the starting position as a starting point and the length as the frame length;
and completely storing the positioning subframes corresponding to the reference cell and the adjacent cell by taking the initial position as a starting point and time domain data with the length of the frame length as a starting point.
5. The time difference of arrival positioning apparatus of claim 4 wherein the power delay profile calculation unit is further adapted to non-coherently combine the power delay profiles corresponding to the plurality of receiving antennas.
6. The time difference of arrival positioning apparatus of claim 4, wherein the time difference of arrival generating unit is adapted to perform interpolation filtering for the optimal power delay profile of each cell, and calculate the time difference of arrival according to the result of the interpolation filtering.
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| US11320511B2 (en) * | 2017-09-29 | 2022-05-03 | Futurewei Technologies, Inc. | Observed time difference of arrival (OTDOA) positioning in wireless communication networks |
| CN110166501B (en) * | 2018-02-11 | 2021-06-29 | 华为技术有限公司 | Positioning method, terminal and server |
| CN111148014B (en) * | 2018-11-02 | 2021-05-25 | 展讯半导体(南京)有限公司 | Configuration method and device of reference signal for positioning, network side equipment and mobile terminal |
| CN111356071B (en) * | 2018-12-21 | 2023-05-16 | 深圳市中兴微电子技术有限公司 | Processing method and device for observing arrival time difference and storage medium |
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