CN106851570B - Method and device for positioning mobile terminal based on MR - Google Patents
Method and device for positioning mobile terminal based on MR Download PDFInfo
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- CN106851570B CN106851570B CN201710040485.0A CN201710040485A CN106851570B CN 106851570 B CN106851570 B CN 106851570B CN 201710040485 A CN201710040485 A CN 201710040485A CN 106851570 B CN106851570 B CN 106851570B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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Abstract
The invention provides a method and a device for positioning a mobile terminal based on an MR. The method comprises the following steps: the method comprises the steps of obtaining first signal receiving power aiming at a service base station and second signal receiving power aiming at a neighbor base station from an MR, calculating received signal strength difference by combining a standard propagation model, thereby eliminating a large number of uncertain parameters in the propagation model, obtaining a fixed value of the ratio of the distance from a mobile terminal to the service base station to the distance from the mobile terminal to the neighbor base station, and finally positioning the mobile terminal by using an Apollonius circle, thereby avoiding the problem that the distance between the mobile terminal and the base station is not accurate by the propagation model and the multipath effect, eliminating the influence of complex coefficients in the propagation model on a calculation result, reducing the influence of a large number of environmental factors, and further improving the positioning accuracy.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for positioning a mobile terminal based on MR (measurement report).
Background
In the technical field of communication, accurate positioning of a mobile terminal is currently an extremely important technical task, which provides a basis for telecom operators to know the user condition of the mobile terminal and the operation condition of the telecom operators in time, and particularly can find a network signal weak coverage area in time by a mode of positioning the mobile terminal, thereby quickly and effectively solving the existing weak coverage problem.
Currently, the most common method is to calculate the distance from the mobile terminal to each base station according to the path loss model of the wireless signal, and then position the mobile terminal by using a triangle centroid positioning method, wherein the path loss model of the wireless signal can be summarized as the following formula:
L＝k1+k2logf-k3loghb-k4loghm+10Nlogd+X
where L is the path loss, f is the signal frequency, hbIs the base station antenna height, hmIs the antenna height of the mobile terminal, d is the propagation distance, k1-k4N, X is a constant coefficient, which varies depending on the propagation environment of the signal, and d can be calculated from the above equation.
However, since the Non-Line of Sight (NLOS) error of the wireless signal propagation is a large Non-negative value, the calculated distance is much larger than the real distance, and thus when the mobile terminal is located by using the triangle centroid location method, the location of the mobile terminal is located in the overlapping region of the circles (as the region surrounded by A, B, C points in fig. 1) with each distance d as the radius. The point in this area where the sum of the distances to the three points A, B, C is the smallest, i.e., the point where F (x, y) ═ min F (x, y) is the location of the mobile terminal, where: f (x, y) ═ x-xA)2+(y-yA)2+(x-xB)2+(y-yB)2+(x-xC)2+(y-yC)2。
In the above algorithm, the determination rule of intersection A, B, C is: arbitrarily selecting two circles (such as the base station BS1 and the base station BS2 in FIG. 1), and calculating the intersection point (namely, the points A and F) of the two circles; selecting a point (i.e., point a) closest to and within the third circle (base station BS3) from the two intersections as a boundary point of the overlapping area; if both intersections lie within the third circle, both points are selected, and if neither intersection lies within the third circle, neither point is selected.
But considering some special cases: because of measurement errors, the two circles may not have an intersection, as shown in FIG. 2, between the circle where the base station BS1 is located and the circle where the base station BS2 is located(this absence of intersection is caused by the RSS value measured by BS2 containing a large NLOS (non line of sight) error, etc.). To handle this, the radius r2 of the circle in which the base station BS2 is located is corrected to r2 ═ d12+ r1, wherein d12Representing the distance between base station BS1 and base station BS 2. The modified circle with radius r 2' intersects the circle in which base station BS1 is located at one point (i.e., point D), so that only A, B out of 5 points satisfy the condition according to the above principle of determining the coverage area boundary points, and thus F (x, y) is modified as: f (x, y) ═ x-xA)2+(y-yA)2+(x-xB)2+(y-yB)2The MS position is still determined by F (x, y) ═ min F (x, y).
In addition, referring to fig. 3, there is no intersection between the circle of the base station BS1 and the circle of the base station BS3, and this is mainly because the RSS measured by the two base stations contains a large measurement error. To handle this non-intersection situation, the midpoint of the connection between base station BS1 and base station BS3 (i.e., point a) would be treated as the intersection of the two circles. According to the principle of determining the boundary point of the coverage area, the point a is the position of the mobile terminal.
In the above positioning method in which the mobile terminal measures 3 base station signals, if the mobile terminal can measure the path loss of N base stations, the estimated values of the distances from the mobile terminal to the N base stations can be obtained, that is, N distance circles (i.e., circles made by taking the distance from the mobile terminal to the base stations as the radius) can be determined. Optionally 3 of them, a total of
And (4) carrying out various combinations, wherein for each combination, GLE algorithm is utilized to carry out position estimation of the mobile terminal, K estimated values are obtained and are marked as { X1，X2…XKThen calculating the centroid of the K position estimation values
If it is not
Within the sector ring defined by CI and TA, then
Is the finally determined position of the mobile terminal. If it is not
Not located within the sector ring defined by CI and TA, then
The midpoint of the line connecting the centers of the fan rings is the finally determined position of the mobile terminal.
Although the distances from the mobile terminal to the service base station and the neighboring base stations can be calculated through the propagation model, the position of the mobile terminal is determined by utilizing a triangular centroid positioning algorithm; however, the scheme cannot distinguish whether the mobile terminal is indoors or outdoors, and if the same propagation model is adopted, the distance calculated according to the propagation model is large due to large loss of the indoor mobile terminal, which is contradictory to the actual situation. In addition, in the transmission process, the geomorphic environment is complex, the transmission model parameters are more, and the influence factors on the transmission loss result are more, so that the distance between the mobile terminal and the base station obtained by calculation is inaccurate, and further, the mobile terminal is inaccurately positioned.
Disclosure of Invention
The embodiment of the application provides a method and a device for positioning a mobile terminal based on a Measurement Report (MR), and at least solves the problem that the positioning of the mobile terminal is inaccurate in the prior art.
According to an embodiment of the present invention, there is provided a method for positioning a mobile terminal based on MR, including: determining first receiving power when a mobile terminal to be positioned receives reference signals sent by a service base station according to a Measurement Report (MR), and determining second receiving power when the mobile terminal to be positioned receives the reference signals sent by three adjacent base stations adjacent to the service base station; determining the ratio of the distance from the mobile terminal to be positioned to the serving base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the first receiving power and the three second receiving powers; determining three circle of Arrhenius according to the three ratios, the position of the service base station and the positions of the three adjacent base stations by using the Arrhenius circle theorem; and when the three circle of Arch intersect at one point, determining the position corresponding to the intersection point as the position of the mobile terminal to be positioned, or when the three circle of Arch intersect at the three points, determining the position corresponding to the centroid of a triangle formed by the three intersection points as the position of the mobile terminal to be positioned.
According to another embodiment of the present invention, there is provided an apparatus for positioning a mobile terminal based on MR, including: the receiving power determining unit is used for determining first receiving power when the mobile terminal to be positioned receives the reference signals sent by the service base station according to the measurement report MR and determining second receiving power when the mobile terminal to be positioned receives the reference signals sent by three adjacent base stations adjacent to the service base station; a ratio determining unit, configured to determine, according to the first receiving power and the three second receiving powers, a ratio between a distance from the mobile terminal to be positioned to the serving base station and a distance from the mobile terminal to be positioned to each of the three neighboring base stations; an circle of attritor determining unit, configured to determine three circles of attritor according to the three determined ratios, the position of the serving base station, and the positions of the three neighboring base stations, by using the circle of attritor theorem; and the positioning unit is used for determining the position corresponding to the intersection point as the position of the mobile terminal to be positioned when the three Archie circles intersect at one point, or determining the position corresponding to the centroid of a triangle formed by the three intersection points as the position of the mobile terminal to be positioned when the three Archie circles intersect at the three points.
The at least one technical scheme adopted by the embodiment of the application can achieve one or more of the following beneficial effects: according to the technical scheme, the first signal receiving power for the service base station and the second signal receiving power for the neighbor base station are obtained from the MR, the received signal strength difference is calculated by combining a standard propagation model, so that a large number of uncertain parameters in the propagation model are eliminated, the ratio of the distance from the mobile terminal to the service base station to the distance from the mobile terminal to the neighbor base station is obtained as a fixed value, and finally the mobile terminal is positioned by using an Apollonius circle, so that the problem that the distance between the mobile terminal and the base station is not accurate through the propagation model and the multipath effect is solved, the influence of complex coefficients in the propagation model on the calculation result is eliminated, and the complex coefficients are only related to the distance and the coefficient related to the height of the base station, so that the influence of a large number of environmental factors is reduced through the calculation result.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a triangle centroid location principle involved in the prior art;
FIG. 2 is a schematic diagram of a second principle of triangle centroid location according to the prior art;
FIG. 3 is a third schematic diagram illustrating the positioning principle of the centroid of a triangle according to the prior art;
fig. 4 is a schematic diagram illustrating a step of a method for positioning a mobile terminal according to an embodiment of the present invention;
FIG. 5(a) is a schematic diagram of MR acquisition principle;
FIG. 5(b) is a schematic diagram of the principle of the Archer's circle theorem shown in the embodiment of the present invention;
FIG. 6 is a schematic diagram of the intersection of three circles shown in the embodiment of the present invention;
FIG. 7 is a schematic diagram of three circles shown in the embodiment of the present invention intersecting at three points;
fig. 8 is a schematic structural diagram of a mobile terminal positioning device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Example 1
As shown in fig. 4, a schematic step diagram of a method for positioning a mobile terminal according to an embodiment of the present invention is implemented based on a measurement report MR, and specifically refers to the following steps:
step 11: and determining first receiving power when the mobile terminal to be positioned receives the reference signals of the serving base station according to the measurement report MR, and determining second receiving power when the mobile terminal to be positioned receives the reference signals of three adjacent base stations adjacent to the serving base station.
According to an embodiment, a measurement report MR is measurement data information reported by a network device, referring to an MR acquisition principle schematic diagram shown in fig. 5(a), the network device (eNodeB or UE) periodically performs acquisition of measurement data, and uploads the acquired MR to a radio access network element management system OMC-R in a periodic setting or event triggering manner, and then the OMC-R periodically generates MR statistical information and reports the MR statistical information to a network management system NMS through a northbound interface, and the NMS performs a series of data analysis according to the MR statistical information. The positioning scheme provided by the invention can be understood as being carried out in NMS, a series of corresponding data of 'position-network information' can be generated through data analysis, and the data can be used for accurately positioning the position of a network problem point, and further carrying out work such as network planning optimization. Thus, the subject of the positioning method of the present invention can be regarded as an NMS or a positioning device integrated in an NMS.
The MR includes the received power of the mobile terminal UE for the serving base station and the received power of the neighboring base station, and if the received power of the reference signal received by the UE from the serving base station is represented by mr.ltescrsrp, the MR is a main index reflecting the coverage condition of the serving base station; lterncsrp denotes the received power of reference signals of neighboring base stations with defined and undefined neighbor relations received under the serving base station where the UE is located. The MR may also include other information, such as base station signal quality and MR. rxtxtimediff, where MR. rxtxtimediff is a UE transmit-receive time difference and may be converted to an approximate distance of the UE from the serving base station.
Thus, after determining a mobile terminal to be positioned, a first reception power at which the mobile terminal to be positioned receives the reference signal of the serving base station and a second reception power at which the mobile terminal to be positioned receives the reference signals of three neighboring base stations adjacent to the serving base station can be determined from the MR.
Through empirical analysis, the height difference between the serving base station and the adjacent base station is controlled within 20%, and the follow-up error can be ensured not to exceed 0.7%; if the heights of the serving base station and the adjacent base station are the same, almost no error exists; therefore, in order to ensure the positioning accuracy, when the adjacent base station is selected, a plurality of adjacent base stations adjacent to the service base station can be determined according to the MR; selecting three adjacent base stations meeting preset constraint conditions; and determining the second receiving power of each adjacent base station in the three adjacent base stations meeting the preset constraint condition received by the mobile terminal to be positioned at the preset time. Wherein, the preset constraint conditions satisfied by the three neighboring base stations are as follows: the heights of the adjacent base stations are sequentially ranked from high to low, and the adjacent base stations ranked at the first three bits are closest to the serving base station in height. And the signal strengths of the three neighboring base stations are high. Therefore, the adjacent base station with the height close to the service base station is selected as much as possible, and the calculation is carried out within the range that the height difference of the adjacent base station is 20%.
Step 12: and determining the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the first signal receiving power and the three second signal receiving powers.
Alternatively, this step 12 may be specifically performed as:
calculating the difference between first receiving power corresponding to a service base station and each second receiving power corresponding to three adjacent base stations;
for example, for a mobile terminal to be located, mr.ltescrsrp, mr.ltenncrrsrpp 1, mr.ltenncrrsrpp 2, mr.ltenncrrsrpp 3, and mr.rxtxtimediff can be obtained from an MR report, and therefore, the difference in received power between the serving base station and each of the three neighboring base stations is easily obtained: for example, the difference between the first received power of the serving base station and the second received power of the neighbor base station 1: Δ RSRP1 ═ mr.ltescrsrp-mr.ltencrsrpp 1, the difference between the first received power of the serving base station and the second received power of the neighbor base station 2: Δ RSRP2 ═ mr.ltescrsrp-mr.ltencrsrp2, the difference between the first received power of the serving base station and the second received power of the neighbor base station 3: Δ RSRP3 ═ mr.ltescrsrp-mr.ltenncrrsrp 3.
And secondly, determining the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the three differences and the standard propagation model SPM.
In fact, the mobile communication propagation environment is far more complex than the free space, and the propagation loss is difficult to be expressed by theoretical analysis, so a model for describing the mobile communication propagation loss must be summarized on the basis of a large amount of test data. The SPM model is supported by a relatively wide application planning tool in TD-LTE wireless network planning
A standard macrocell model. The expression of the SPM model is: PR ═ PTX-PL, wherein,
wherein, PR is the signal strength or the received power of a certain base station received by the UE, and the unit thereof is dBm; PTX is the transmit power value of the base station in dBm; PL is the propagation path loss in dB; k1Is the decay constant; k2Is a correction factor for lg (d) related to the propagation distance; k3A correction factor of lg (heff) that is highly correlated with the transmitter antenna; k4Is a correction factor for diffraction calculations, diffraction losses calculated using the equivalent bladed diffraction method of Epstein Peterson, Deygout or Bullington; k5Is lg (heff) lg (d)A correction factor; k6Is the effective antenna height h of the mobile terminalmThe correction factor of (4); d is the distance between the base station and the mobile terminal; heff is the effective height of the transmitter antenna of the base station; diff _ Loss is the Loss due to diffraction on the blocked path; h ismIs the effective antenna height of the mobile terminal; the Cluter _ offset is a ground feature attenuation correction value and is the average weighted loss of the landform.
In fact, the propagation model calibration may be performed on the above parameters according to the local wireless environment (geographical environments such as mountainous areas, basins, plains, etc. may also be considered), so as to obtain the propagation model coefficients under different scenes (scenes such as dense urban areas, general urban areas, etc.), it should be noted that the propagation model parameters in the following table are only used as an example, and the actual values are different for different scenes such as: k6Parameters such as Clutter _ offset are not necessarily 0, and are detailed in table 1 below:
TABLE 1
In the existing standard propagation model formula, the coverage radius d of the cell governed by the base station needs to be calculated, that is:
wherein, the formula (3) expresses that d is equal to the power of Y of 10, and the value of Y is
Many parameters are related to different propagation environments, the distance from a base station to a mobile terminal, namely a coverage radius formula of the base station, is determined according to the formula, and in the calculation process, the calculation accuracy is influenced by many uncertain factors such as diffraction loss of a wireless environment, surface feature factors, mobile antenna height and the like.
In consideration of the similarity of the propagation environments from the UE to the serving base station and the neighboring base stations, the present invention does not directly calculate the distance by using the above method, but substitutes a propagation model formula by using a calculation method of a difference Δ RSRP between the received powers of the serving base station and the neighboring base stations, where the propagation model formula is obtained by taking the serving base station Cell0 and the neighboring base station Cell1 as examples:
the Δ RSRP is a difference value between a first signal received power corresponding to the serving base station Cell0 and a second signal received power corresponding to the current neighbor base station Cell 1; Δ KCell1Is the difference between the attenuation constant in the SPM coefficient of the serving base station Cell0 and the attenuation constant in the SPM coefficient of the current neighbor base station Cell 1; k3 is the transmitting antenna height correction factor of the serving Cell0 and the current neighbor Cell 1; k5 is a correction factor of the logarithm of the antenna heights of the serving Cell0 and the current neighbor Cell 1; the Heff0 is an antenna effective height corresponding to the serving base station Cell 0; the Heff1 is the effective height of the antenna corresponding to the current neighbor base station Cell 1; the d0 is the distance from the mobile terminal to be positioned to the serving base station Cell 0; d isTOAThe approximate equal distance from the mobile terminal to be positioned to the serving base station Cell0 is determined according to the time difference of the sending and receiving signals of the mobile terminal to be positioned and the serving base station Cell 0; the d1 is the distance from the mobile terminal to be positioned to the current neighbor base station Cell 1; d0/d1 is constant, i.e. the ratio of the distance of the mobile terminal to the serving Cell0 to the distance of the mobile terminal to the neighboring Cell1 is constant.
Further, the formula can be simplified as follows:
as can be seen from the equation, d0 is the distance from the UE to the serving BS, and the approximate value d of d0 can be calculated from MR by RxTxTimeDiffTOAThen, the above equation (5) can be further simplified as:
it can be seen from the above formula that uncertain factors such as terrain related to environment, parameters such as K4, Diff _ Loss, Clutter _ offset, etc., and the influence of K6 coefficient related to the antenna height of the mobile terminal are eliminated in this way. Further combining with a base station database, obtaining base station transmitting power, base station antenna height and base station transmitting frequency from the database, wherein: the Δ PTX1-PTX2 is a known value, and in general (the base station transmission power is the same), the Δ PTX is 0, and can be specifically calculated according to an actual value; Δ KCell1Is a known value, if the frequency bands of the serving base station and the adjacent base station are the same, then Δ KCell1If the frequency bands are different, the frequency bands can be calculated according to the attenuation constant in the SPM coefficient of the serving base station Cell0 and the attenuation constant in the SPM coefficient of the current neighbor base station Cell 1; k3 × lg (Heff0/Heff1) is a known value, and the height ratio of the serving bs to the neighbor bss can be obtained from the bs database. If the height of the serving base station antenna is not much different from the height of the neighboring base station antenna, lg (Heff0/Heff1) is a small variable value (if the heights of the two are the same, the value is 0); if the actual distance from the UE to the serving base station is not much different from the distance reported by the MR, lg (d 0/d)TOA) In order to obtain a small variable value, K5 × lg (Heff0/Heff1) × lg (d 0/d)TOA) Is a small variable value which can be ignored.
Therefore, equation (6) above can be further simplified to obtain:
further, it can be deduced that:
furthermore, the ratio of the distance d0 from the mobile terminal to the serving base station Cell0 to the distance dn from the mobile terminal to the neighboring base station Cell can be derived through the above formula (9), referring to the following formula (1), where n can be an integer such as 1, 2, 3, etc.;
wherein, the formula (1) expresses that d0/dn is equal to the power of X of 10, and the value of X is
The delta PTX is the difference between the transmission power of the service base station and the transmission power of the current adjacent base station n; the Δ RSRP is a difference value between a first signal received power corresponding to the serving base station and a second signal received power corresponding to a current neighbor base station n; said Δ KCellnThe difference between the attenuation constant in the SPM coefficient of the service base station and the attenuation constant in the SPM coefficient of the current adjacent base station n; the K3 is a transmitting antenna height correction factor of the service base station and the current adjacent base station n; the K5 is a correction factor of the antenna height logarithm values of the serving base station and the current adjacent base station n; the Heff0 is the effective height of the antenna corresponding to the service base station; the Heffn is the effective height of the antenna corresponding to the current adjacent base station n; the d0 is the distance from the mobile terminal to be positioned to the serving base station; d isTOADetermining an approximate equal distance from the mobile terminal to be positioned to the service base station according to the time difference of the sending and receiving signals of the base station corresponding to the mobile terminal to be positioned and the service base station; the dn is the distance from the mobile terminal to be positioned to the current adjacent base station n; d0/dn is constant, i.e. the ratio of the distance of the mobile terminal to the serving base station to the distance of the mobile terminal to the neighbor base station n is constant.
Here, the error of d0/dn needs to be analyzed, taking d0/d1 as an example:
wherein, in the formula (8), d0/d1 is equal to the power of Z of 10 multiplied by
Z has a value of
Namely to represent
Equal to the power of T of 10, T being taken to the value
Lower pair
Further analysis: in order to ensure the positioning accuracy of the invention, when selecting the adjacent base station cell, the adjacent base station with the height close to the service base station is selected as much as possible, and the calculation is carried out according to the height difference of 20 percent of the adjacent base station, so that Heff0/Heff1 epsilon [0.83, 1.2], | lg (Heff0/Heff1) | epsilon [0, 0.08). According to dTOAThe error with d0 is within 50 percent, i.e. d is more than or equal to 1/1.50/dTOAThe | lg (d 0/d) can be obtained by calculating the ratio of ≤ 1.5TOA)|∈[0，0.176]. Assuming that K2 is 41.89, K5 is-6.55, and Heff1 is 35 (average height of base station) in propagation model parameters, the calculation can obtain:
therefore, the height difference between the serving base station and the adjacent base station is controlled within 20 percent, and the error of d0/d1 can be calculated to be not more than 0.7 percent; if the serving base station and the neighbor base station are the same in height, there is no error in d0/d 1. Thus, d0/dn also satisfies the above condition.
Therefore, the distance d0 from the mobile terminal UE to be located to the serving base station can be calculated according to the above method, and the ratio of the distance d1, d2, d3 from the mobile terminal UE to be located to the neighboring base station 1, the neighboring base station 2, the neighboring base station 3, that is, the ratio corresponding to the neighboring base station 1: d0/d1, ratio corresponding to the neighboring base station 2: d0/d2, the corresponding ratio of the adjacent base station 3: d0/d 3.
Step 13: and determining three circle of Arrhenius according to the three determined ratios, the position of the service base station and the positions of the three adjacent base stations by using the Arrhenius circle theorem.
First, we introduce the law of circle of Arhnsonia, which is called the law of circle of Arbornism in its entirety, and specifically described as: referring to FIG. 5(b), if the distance ratio between a moving point P and two fixed points F1 and F2 is equal to the fixed ratio m: n, the locus of the point P is a circle having a diameter equal to the line connecting the two points of the inner and outer fixed line segments AB in the fixed ratio m: n. The circle is called an Apollonius circle, called an Apollonius circle for short; the ratio of the distances to the two fixed points F1 and F2 is a fixed value, wherein the two tracks (the circle with the center at C' and the circle with the center at C) with the fixed ratio of k and 1/k (k is not equal to 1) are symmetrical about the middle vertical line of the trunk line segment F1F 2.
In particular, in performing this step 13, for each ratio determined: and determining the circle of Arrowth corresponding to the ratio by taking the position of the service base station and the position of the adjacent base station which determine the ratio as two fixed points and taking the ratio as the distance ratio in the Arrowth circle determination.
For example, referring to fig. 6, the serving Cell0 and the neighboring Cell1 are two fixed points, and the ratio d0/d1 is a distance ratio, so as to obtain an alder circle with O1 as a center; similarly, the serving Cell0 and the neighboring Cell2 are two fixed points, and the ratio d0/d2 is a distance ratio, so as to obtain an alder circle with O2 as the center; the serving Cell0 and the neighboring Cell3 are two fixed points, and the ratio d0/d3 is a distance ratio, so that an circle of attorney with O3 as the center is obtained.
Step 14: and when the three circle of Arabic intersect at one point, determining the position corresponding to the intersection point as the position of the mobile terminal to be positioned, or when the three circle of Arabic intersect at the three points, determining the position corresponding to the centroid of a triangle formed by the three intersection points as the position of the mobile terminal to be positioned.
Generally, the three circle intersection areas are preliminary location areas of the terminal user, and the three circle intersection areas are divided into three cases of point, triangle and non-intersection, and if the intersection is a point (as shown in fig. 6), the point is the location of the mobile terminal; if the intersection is a triangle (as shown in the following fig. 7) enclosed by three points, the centroid of the triangle is the position of the mobile terminal according to the existing triangle centroid positioning method; if the two base stations are not intersected (as in the case of fig. 2 and fig. 3), more neighboring base stations and the serving base station can be selected to construct an apollonis circle, and the intersection condition is found to obtain the accurate position of the mobile terminal.
Further, in the invention, according to the reference signal received power RSRP reported by the mobile terminal, the mobile terminal can be positioned by using the positioning method of the invention when the received power is lower than a preset value or the communication quality is detected to be poor, so that an accurate weak coverage hole, such as an RSRP cell-110 dBm, can be obtained, and all RSRP values and terminal position points are collected and summarized, so as to find and solve the weak coverage problem in time.
Through the technical scheme, three adjacent base stations are selected according to the signal strength (namely receiving power) of the service base station and the adjacent base stations received by the mobile terminal, the distance ratio between the mobile terminal and the service base station and the distance ratio between the mobile terminal and the three adjacent base stations are deduced by utilizing an MR report, a wireless signal propagation model and a base station information database, and the ratio of the distance between the mobile terminal and the service base station to the distance between the mobile terminal and the three adjacent base stations is finally obtained as a fixed value. And then, three Apollonius circles are constructed by utilizing the obtained distance ratio and the position information of the serving base station and the adjacent base station, each Apollonius circle is the position relation meeting the strength of the corresponding signals received by the serving base station and the adjacent base station, and the intersection area of the three Apollonius circles can be determined as the initial position of the terminal user. Furthermore, according to the intersection area of the Apollonius circles, the accurate position of the terminal user can be determined according to the intersection condition of the three Apollonius circles and the triangular mass center positioning method. Therefore, the invention provides a positioning method of an Apollonius round mobile terminal, which avoids the problem that the distance between the mobile terminal and a base station is inaccurate when a propagation model and a multipath effect are calculated, and also avoids the problems that an additional device is needed to measure and calculate the time difference from a terminal user to different base stations and the time difference is converted into the distance difference from the terminal user to different base stations, so that the cost is increased, and meanwhile, a larger error exists; the invention fully utilizes the approximation of the environmental characteristics from the mobile terminal to the surrounding base stations, eliminates the influence of complex coefficients in a propagation model on the calculation result by the strength difference of the received signals, and is only related to the coefficients related to the distance and the height of the base stations, thereby reducing the influence of a large number of environmental factors (such as landform, buildings, the height of the mobile station antenna, diffraction factors and the like) on the calculation result and greatly improving the calculation accuracy. Meanwhile, an additional device is not needed, only the data of the MR and the base station database and the locally corrected propagation model are needed, the positioning cost of the mobile terminal is reduced, and the positioning precision of the mobile terminal is improved.
Example two
The invention also provides a device for positioning the mobile terminal based on the MR, which belongs to the same inventive concept as the first embodiment.
As shown in fig. 8, a schematic structural diagram of an apparatus for positioning a mobile terminal based on MR provided by the present invention is mainly included in the following functional units:
a received power determining unit 21, configured to determine, according to the measurement report MR, first signal received power when the mobile terminal to be positioned receives the reference signal of the serving base station at a preset time, and second signal received power when the mobile terminal to be positioned receives the reference signals of three neighboring base stations adjacent to the serving base station;
a ratio determining unit 22, configured to determine, according to the first signal receiving power and the three second signal receiving powers, a ratio between a distance from the mobile terminal to be positioned to the serving base station and a distance from the mobile terminal to be positioned to each of the three neighboring base stations;
an circle of attritor determining unit 23, configured to determine three circles of attritor according to the three determined ratios, the position of the serving base station, and the positions of the three neighboring base stations, by using the circle of attritor theorem;
the positioning unit 24 is configured to determine, when the three circle arches intersect at one point, a position corresponding to the intersection point as a position of the mobile terminal to be positioned; and when the three circle of Ardisia intersect at the three points, determining the position corresponding to the centroid of the triangle formed by the three intersection points as the position of the mobile terminal to be positioned.
Optionally, when determining, according to the measurement report MR, that the mobile terminal to be located receives the second signal received powers of three neighboring base stations adjacent to the serving base station at a preset time, the received power determining unit 21 is specifically configured to: determining a plurality of adjacent base stations adjacent to the service base station according to the MR; selecting three adjacent base stations meeting preset constraint conditions; and determining the second signal receiving power of each adjacent base station in the three adjacent base stations meeting the preset constraint condition received by the mobile terminal to be positioned at the preset time.
Optionally, the ratio determining unit 22 is specifically configured to: calculating the difference between the first signal receiving power corresponding to the service base station and each second signal receiving power corresponding to the three adjacent base stations; and determining the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the three differences and a standard propagation model SPM.
Optionally, when determining, according to the three differences and the standard propagation model SPM, the ratio determining unit 22 is specifically configured to: the following formula is determined from the standard propagation model SPM:
wherein, the formula (1) expresses that d0/dn is equal to the power of X of 10, and the value of X is
The delta PTX is the difference between the transmission power of the service base station and the transmission power of the current adjacent base station n; the Δ RSRP is a difference value between a first signal received power corresponding to the serving base station and a second signal received power corresponding to a current neighbor base station n; said Δ KCellnThe difference between the attenuation constant in the SPM coefficient of the service base station and the attenuation constant in the SPM coefficient of the current adjacent base station n; the K3 is the serviceThe height correction factors of the transmitting antennas of the base station and the current adjacent base station n; the K5 is a correction factor of the antenna height logarithm values of the serving base station and the current adjacent base station n; the Heff0 is the effective height of the antenna corresponding to the service base station; the Heffn is the effective height of the antenna corresponding to the current adjacent base station n; the d0 is the distance from the mobile terminal to be positioned to the serving base station; d isTOADetermining an approximate equal distance from the mobile terminal to be positioned to the service base station according to the time difference of the sending and receiving signals of the base station corresponding to the mobile terminal to be positioned and the service base station; the dn is the distance from the mobile terminal to be positioned to the current adjacent base station n; substituting the difference into the formula (1), and calculating to obtain the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations.
Optionally, the circle of attorney determination unit 23 is specifically configured to: for each ratio determined: and determining the circle of Arrowth corresponding to the ratio by taking the position of the service base station and the position of the adjacent base station which determine the ratio as two fixed points and taking the ratio as the distance ratio in the Arrowth circle determination.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A method for positioning a mobile terminal based on MR is characterized by comprising the following steps:
determining first receiving power when a mobile terminal to be positioned receives reference signals sent by a service base station according to a Measurement Report (MR), and determining second receiving power when the mobile terminal to be positioned receives the reference signals sent by three adjacent base stations adjacent to the service base station;
determining the ratio of the distance from the mobile terminal to be positioned to the serving base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the first receiving power and the three second receiving powers;
determining three circle of Arrhenius according to the three ratios, the position of the service base station and the positions of the three adjacent base stations by using the Arrhenius circle theorem;
when the three circle of attorney intersect at one point, determining the position corresponding to the intersection point as the position of the mobile terminal to be positioned, or when the three circle of attorney intersect at the three point, determining the position corresponding to the centroid of a triangle formed by the three intersection points as the position of the mobile terminal to be positioned;
wherein, the determining, according to the first receiving power and the three second receiving powers, a ratio of a distance from the mobile terminal to be positioned to the serving base station to a distance from the mobile terminal to be positioned to each of the three neighboring base stations specifically includes:
calculating the difference between the first receiving power corresponding to the service base station and each second receiving power corresponding to the three adjacent base stations;
and determining the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the three differences and a standard propagation model SPM.
2. The method according to claim 1, wherein determining, according to the MR, second reception powers at which the mobile terminal to be positioned receives three neighboring base stations neighboring the serving base station specifically comprises:
determining a plurality of adjacent base stations adjacent to the service base station according to the MR;
selecting three adjacent base stations meeting preset constraint conditions;
and determining the second receiving power of each adjacent base station in the three adjacent base stations meeting the preset constraint condition received by the mobile terminal to be positioned.
3. The method according to claim 1, wherein determining, according to the three differences and a standard propagation model SPM, a ratio between a distance from the mobile terminal to be positioned to the serving base station and a distance from the mobile terminal to be positioned to each of the three neighboring base stations, specifically includes:
the following formula is determined from the standard propagation model SPM:
wherein, the formula (1) expresses that d0/dn is equal to the power of X of 10, and the value of X is
The delta PTX is the difference between the transmission power of the service base station and the transmission power of the current adjacent base station n; the Δ RSRP is a difference value between a first received power corresponding to the serving base station and a second received power corresponding to a current neighbor base station n; said Δ KCellnThe difference between the attenuation constant in the SPM coefficient of the service base station and the attenuation constant in the SPM coefficient of the current adjacent base station n; the K3 is a transmitting antenna height correction factor of the service base station and the current adjacent base station n; the K5 is a correction factor of the antenna height logarithm values of the serving base station and the current adjacent base station n; the Heff0 is the effective height of the antenna corresponding to the service base station; the Heffn is the effective height of the antenna corresponding to the current adjacent base station n; the d0 represents the mobile terminal to be positioned to the service base stationThe distance of (d); d isTOADetermining an approximate equal distance from the mobile terminal to be positioned to the service base station according to the time difference of the sending and receiving signals of the base station corresponding to the mobile terminal to be positioned and the service base station; the dn is the distance from the mobile terminal to be positioned to the current adjacent base station n;
substituting the difference into the formula (1), and calculating to obtain the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations.
4. The method of claim 1, wherein determining three circle of attorney according to the three ratios determined and the positions of the serving base station and the three neighboring base stations by using the circle of attorney theorem comprises:
for each ratio determined: and determining the circle of Arrowth corresponding to the ratio by taking the position of the serving base station and the position of the adjacent base station for determining the ratio as two fixed points and taking the ratio as the distance ratio in the circle of Arrowth for determining the ratio.
5. An apparatus for positioning a mobile terminal based on MR, comprising:
the receiving power determining unit is used for determining first receiving power when the mobile terminal to be positioned receives the reference signals sent by the service base station according to the measurement report MR and determining second receiving power when the mobile terminal to be positioned receives the reference signals sent by three adjacent base stations adjacent to the service base station;
a ratio determining unit, configured to determine, according to the first receiving power and the three second receiving powers, a ratio between a distance from the mobile terminal to be positioned to the serving base station and a distance from the mobile terminal to be positioned to each of the three neighboring base stations;
an circle of attritor determining unit, configured to determine three circles of attritor according to the three determined ratios, the position of the serving base station, and the positions of the three neighboring base stations, by using the circle of attritor theorem;
the positioning unit is used for determining the position corresponding to the intersection point as the position of the mobile terminal to be positioned when the three Archie circles intersect at one point, or determining the position corresponding to the centroid of a triangle formed by the three intersection points as the position of the mobile terminal to be positioned when the three Archie circles intersect at the three points;
wherein, the determining, according to the first receiving power and the three second receiving powers, a ratio of a distance from the mobile terminal to be positioned to the serving base station to a distance from the mobile terminal to be positioned to each of the three neighboring base stations specifically includes:
the ratio determining unit is specifically configured to calculate a difference between the first receiving power corresponding to the serving base station and each of the second receiving powers corresponding to the three neighboring base stations;
and determining the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations according to the three differences and a standard propagation model SPM.
6. The apparatus of claim 5, wherein the reception power determination unit determines the second reception power of the mobile terminal to be positioned from the measurement report MR by:
determining a plurality of adjacent base stations adjacent to the service base station according to the MR;
selecting three adjacent base stations meeting preset constraint conditions;
and determining second receiving power when the mobile terminal to be positioned receives the reference signal sent by each of the three adjacent base stations meeting the preset constraint condition.
7. The apparatus as claimed in claim 5, wherein the ratio determining unit determines the ratio of the distance from the mobile terminal to be positioned to the serving base station to the distance from the mobile terminal to be positioned to each of the three neighboring base stations, respectively, based on the three differences and a standard propagation model SPM, by performing the following operations:
the following formula is determined from the standard propagation model SPM:
wherein, the formula (1) expresses that d0/dn is equal to the power of X of 10, and the value of X is
The delta PTX is the difference between the transmission power of the service base station and the transmission power of the current adjacent base station n; the Δ RSRP is a difference value between a first signal received power corresponding to the serving base station and a second signal received power corresponding to a current neighbor base station n; said Δ KCellnThe difference between the attenuation constant in the SPM coefficient of the service base station and the attenuation constant in the SPM coefficient of the current adjacent base station n; the K3 is a transmitting antenna height correction factor of the service base station and the current adjacent base station n; the K5 is a correction factor of the antenna height logarithm values of the serving base station and the current adjacent base station n; the Heff0 is the effective height of the antenna corresponding to the service base station; the Heffn is the effective height of the antenna corresponding to the current adjacent base station n; the d0 is the distance from the mobile terminal to be positioned to the serving base station; d isTOADetermining an approximate equal distance from the mobile terminal to be positioned to the service base station according to the time difference of the sending and receiving signals of the base station corresponding to the mobile terminal to be positioned and the service base station; the dn is the distance from the mobile terminal to be positioned to the current adjacent base station n;
substituting the difference into the formula (1), and calculating to obtain the ratio of the distance from the mobile terminal to be positioned to the service base station to the distance from the mobile terminal to be positioned to each of the three adjacent base stations.
8. The apparatus of claim 5, wherein the circle of attorney determination unit determines three circles of attorney by performing the following operations:
for each ratio determined: and determining the circle of Arrowth corresponding to the ratio by taking the position of the service base station and the position of the adjacent base station which determine the ratio as two fixed points and taking the ratio as the distance ratio in the Arrowth circle determination.
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| CN109428657B (en) * | 2017-08-29 | 2021-08-13 | 中国移动通信集团吉林有限公司 | Positioning method and device |
| CN107750051B (en) * | 2017-09-29 | 2020-06-23 | 重庆玖舆博泓科技有限公司 | Optimization method and device of wireless propagation model |
| CN108259097B (en) * | 2017-12-29 | 2021-03-09 | 中国通信建设集团设计院有限公司 | Method and device for correcting wireless propagation model based on MR data |
| CN110012418A (en) * | 2017-12-31 | 2019-07-12 | 中国移动通信集团湖北有限公司 | Recognition methods, device, equipment and the medium of wireless network covering problem |
| CN108471596A (en) * | 2018-03-06 | 2018-08-31 | 广州杰赛科技股份有限公司 | Node positioning method, node locating device, computer equipment and storage medium |
| CN110234163B (en) * | 2018-03-06 | 2022-03-29 | 中国移动通信集团海南有限公司 | Method, device, equipment and medium for positioning user terminal |
| CN109581287B (en) * | 2019-01-22 | 2024-02-09 | 西南石油大学 | Wi-Fi-based post-earthquake pressure burying personnel positioning method |
| CN112203214A (en) * | 2019-06-20 | 2021-01-08 | 中兴通讯股份有限公司 | Terminal device positioning method and device, storage medium and electronic device |
| CN110300182A (en) * | 2019-07-04 | 2019-10-01 | 深圳市网心科技有限公司 | Network node dispatching method and device, computer installation and storage medium |
| CN114126042A (en) * | 2021-11-22 | 2022-03-01 | 中大检测(湖南)股份有限公司 | TDOA-based WLAN positioning method |
| CN114363806A (en) * | 2021-12-30 | 2022-04-15 | 北京红山信息科技研究院有限公司 | High-precision 5G triangulation method |
| CN115032585B (en) * | 2022-08-11 | 2022-11-08 | 电子科技大学 | RSS ranging and ray tracing technology-based non-line-of-sight scene positioning method |
| CN116449255B (en) * | 2023-03-09 | 2023-12-22 | 国网浙江省电力有限公司嘉兴供电公司 | Fault detection system and method for box-type transformer |
| CN116256788B (en) * | 2023-05-11 | 2023-07-11 | 中国人民解放军战略支援部队航天工程大学 | Space geometric iteration satellite positioning method based on Apollonius circle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852591A (en) * | 2005-10-31 | 2006-10-25 | 华为技术有限公司 | Method for positioning mobile terminal |
| KR20100032695A (en) * | 2008-09-18 | 2010-03-26 | 에스케이 텔레콤주식회사 | Method and apparatus for calculating location of mobile communication terminal |
| CN103906228A (en) * | 2012-12-28 | 2014-07-02 | 中国电信股份有限公司 | Mobile terminal base station differential positioning method, positioning device and system |
-
2017
- 2017-01-19 CN CN201710040485.0A patent/CN106851570B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1852591A (en) * | 2005-10-31 | 2006-10-25 | 华为技术有限公司 | Method for positioning mobile terminal |
| KR20100032695A (en) * | 2008-09-18 | 2010-03-26 | 에스케이 텔레콤주식회사 | Method and apparatus for calculating location of mobile communication terminal |
| CN103906228A (en) * | 2012-12-28 | 2014-07-02 | 中国电信股份有限公司 | Mobile terminal base station differential positioning method, positioning device and system |
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