CN1933658A - Method and apparatus for realizing mobile station positioning in radio communication system - Google Patents

Abstract

The invention relates to a method and device for realizing positioning of a mobile station in a wireless communication system. The present invention mainly includes: firstly, measuring the received power values of different cell signals with the same receiving and transmitting antenna positions of the mobile station; sending the measurement information to the network through a measurement report, and then, the network obtains the received power values and The direction angle calculation of each cell determines the direction angle information of the mobile station relative to the cell; finally, the network performs positioning of the mobile station according to the direction angle information relative to the cell and the TA value. Since the present invention determines the position of the mobile station based on the information in the measurement report reported by the mobile station and determines the position of the mobile station based on the direction angle information of the adjacent cell, the present invention can calculate and determine the position of the mobile station in the wireless communication system relatively easily. position, effectively improving the processing efficiency for mobile station positioning.

Description

Method and device for realizing mobile station positioning in wireless communication system

technical field

The invention relates to the technical field of wireless communication, in particular to a wireless positioning technology implemented in a wireless communication system.

Background technique

In the wireless communication system, the mobile positioning service based on the user's location has attracted much attention. With the development of the mobile positioning technology, the mobile positioning service will bring rich profits to the operator.

At present, some operators have provided corresponding mobile positioning services in their recently opened 3G networks, which can provide users with detailed, real-time updated digital maps to inform users of their specific locations, and can guide users through electronic maps Find hotels, restaurants, shops, and other commercial establishments of interest to the user.

At present, the mobile positioning technology includes a wireless positioning technology based on the mobile station measurement report. The following will take the GSM network as an example to describe the existing implementation scheme of wireless positioning based on the mobile station measurement report.

In the GSM (Global System for Mobile Communications) network, in order to reduce the complexity of positioning processing for mobile stations, reduce the changes to the established network and the changes to existing mobile stations, when designing the positioning scheme, usually Try to use the measurable system resources of the mobile station or base station in the network to estimate the geographical location information of the mobile station. Wherein, the system resource includes: RxLEV (signal strength), CI (cell identification number), TA (timing advance) and so on.

At present, in the GSM network, there are usually many specific implementation schemes for using the above-mentioned measurable system resource information to locate the mobile station, which can be mainly classified into two types, namely:

(1) FSM (field strength mapping method, Field Strength Mapping) method

In the FSM method, it is specifically as follows: first, use a test mobile station, such as a mobile phone, to store the relevant data of the entire positioning network area obtained by the mobile phone measurement and the corresponding mobile phone position in the database; after that, when the mobile phone needs positioning processing , compare the signal characteristic value measured by the mobile phone with the signal stored in the database, so as to determine the corresponding mobile phone location.

However, in the FSM method, due to the need for large-scale signal measurement and the need to store a large number of signals in the mobile station at the same time, the FSM positioning method requires a relatively large amount of work in the early stage when it is implemented, and in the follow-up maintenance work Due to the need to maintain a large amount of information, the maintenance work is also more complicated.

(2) DCM (Distance Calculation Method, Distance Calculation Method) method

In the DCM method, the position is calculated mainly by constructing mathematical equations or equations based on corresponding mathematical models based on signal characteristic values measured by mobile phones or base stations, such as measured values for the system resource information. Compared with the FSM method, the positioning processing implementation method requires less investment in the preliminary work, that is, it does not need to store a large amount of data in the mobile station, so the use method is more flexible, and it is more adaptable to changes in the network structure. powerful.

In the DCM method, a channel fading model needs to be used for position estimation. However, due to the complexity of the wireless environment, it is difficult to obtain a suitable model to accurately reflect the channel characteristics and achieve high-precision position estimation; moreover, in the process of applying the DCM method, when the wireless environment changes, the The model parameters need to be corrected accordingly. At this time, a certain amount of signal measurement and signal storage and processing are required, so the maintenance workload is relatively large. In addition, since most of the actual network is a directional cell, the gain of the cell transmitting antenna is different in each direction. For this situation, it is difficult to effectively avoid it through the model in the process of position estimation using the DCM method. Therefore, Therefore, an accurate position estimation result cannot be obtained.

Contents of the invention

The purpose of the present invention is to provide a method and device for positioning a mobile station in a wireless communication system, so that the position of the mobile station in the wireless communication system can be calculated and determined relatively easily, and the processing efficiency for positioning the mobile station can be effectively improved.

The purpose of the present invention is achieved through the following technical solutions:

The present invention provides a method for realizing positioning of a mobile station in a wireless communication system, comprising:

A. Measure the received power value of the mobile station receiving signals from different cells with the same transmitting antenna position;

B. Calculate and determine the direction angle information of the mobile station relative to the cell's transmitting antenna position according to the received power values of different cell signals obtained by measurement and the direction angle of each cell;

C. Positioning the mobile station according to the direction angle information relative to the position of the transmitting antenna of the cell.

Described step A comprises:

Determine two adjacent cells where the mobile station is located according to at least one set of measurement reports reported by the mobile station for each cell with the same transmitting antenna position, and measure the power value of the mobile station receiving at least one set of signals from the two adjacent cells .

Described step B comprises:

According to the signal measurement results of the mobile station on different cells with the same transmitting antenna position, combined with the direction angle of each cell and the directional characteristics of the transmitting antenna, the direction angle of the mobile station relative to the position of the transmitting antenna of each cell is calculated.

Described step B specifically comprises:

B1. Set up a system of equations for calculating the direction angle information of the mobile station relative to each cell:

A+B=β-α;

PT1(A)=PR1+D1;

PT2(B)=PR2+D2;

Among them, A and B are the angles between the direction angle of the mobile station relative to the position of the transmitting antenna to be solved and the direction angle of the first cell and the direction angle of the second cell, respectively, and β and α are the angles of the first cell and the second cell, respectively. Direction angle value, PT1(A) and PT2(B) the transmit power value of the first cell and the second cell in the direction of the mobile station position, PR1 and PR2 are the signal power values of the mobile station receiving the first cell and the second cell , D1 and D2 are the attenuation of the first cell and the second cell signal to the mobile station, and D1=D2;

B2. Calculating and determining angles A and B between the direction angle of the mobile station relative to the position of the base station transmitting antenna and the direction angle of the first cell and the direction angle of the second cell, respectively, according to the equation set listed in step B1.

Described step C comprises:

When calculating and obtaining the direction angle information of the mobile station relative to the location of the transmitting antenna of the cell, according to the direction angle information, the time advance TA is used to assist in determining the position information of the mobile station.

Described step C comprises:

When calculating and obtaining the direction angle information of the mobile station relative to two or more different transmitting antenna positions, the straight line where the mobile station is located is respectively determined according to the direction angle information relative to the different transmitting antenna positions, and according to the direction angle information of each straight line The intersection points determine the location information of the mobile station.

The present invention also provides a device for realizing positioning of a mobile station in a wireless communication system, including:

Received signal power measurement module: installed in the mobile station, used to measure the received power values of signals of different cells that need to be reported;

Direction angle information calculation module: use the directional characteristics of the transmitting antenna to calculate the direction angle information of the mobile station relative to the positions of the transmitting antennas in each cell according to the received power measurement results reported by the mobile station and the position information of the transmitting antennas in each cell;

Positioning processing module: determine the position information of the mobile station according to the direction angle information of the mobile station relative to the positions of the transmitting antennas of each cell calculated and obtained by the direction angle information calculation module.

The positioning processing module includes:

TA-assisted positioning module: determine the distance between the mobile station and the base station through TA-assisted positioning;

The first mobile station position information calculation module: determine the position information of the mobile station according to the direction angle information of the position of the mobile station relative to the position of the transmitting antenna of a cell and the distance between the mobile station and the base station determined by the TA-assisted positioning module.

The positioning processing module includes:

The second mobile station position information calculation module: determine the position information of the mobile station according to the intersection point where the direction angles of the mobile station's position relative to two or more different transmitting antenna positions intersect.

It can be seen from the technical solution provided by the present invention above that the present invention determines the position of the mobile station by determining the direction angle information of the mobile station relative to the position of the transmitting antenna of one or more cells according to the information in the measurement report reported by the mobile station Therefore, the present invention can calculate and determine the position of the mobile station in the wireless communication system relatively simply, and effectively improve the processing efficiency for positioning the mobile station.

Moreover, since the present invention measures the position of the mobile station according to the measurement report reported by the mobile station and the known transmitting antenna positions, antenna direction characteristics and direction angles of each cell, there is no need to maintain a large amount of information during the mobile station positioning process. Data information, which can effectively reduce the maintenance workload caused by mobile station positioning.

Description of drawings

Figure 1 is a schematic diagram of the direction angle of the mobile station;

FIG. 2 is a schematic diagram of positioning of a mobile station based on direction angle information;

Fig. 3 is a schematic diagram of a specific implementation process of the method of the present invention;

FIG. 4 is a schematic diagram of a specific implementation structure of the device provided by the present invention;

FIG. 5 is a second structural schematic diagram of the specific implementation of the device provided by the present invention.

Detailed ways

The core of the present invention is to avoid the complexity of the wireless channel and the influence of the directionality of the antenna gain of the cell as much as possible when using resources such as signal strength RxLEV, cell identification number CI, and time advance TA for positioning calculations, thereby obtaining higher accuracy positioning results while minimizing maintenance workload.

Specifically speaking, the core idea of the present invention is that in the measurement report reported by the mobile station, the measurement results of different cells with the same transmitting antenna position are taken as a set of data, and then, through this set of data, the relative value of the mobile station can be obtained. Based on the direction angle of the position of the transmitting antenna, finally, the position information of the mobile station can be accurately determined according to the direction angle information of the mobile station.

In a wireless communication system, as long as the current cell where the mobile station is located is a directional cell, it can be guaranteed that there is at least one set of measurement data required for the direction angle measurement of the mobile station including the current cell. If there are adjacent directional cells, two or more sets of measurement data for measuring the direction angle of the mobile station can also be obtained.

As shown in Figure 1, when only one set of measurement data is obtained, TA (time advance) can be used to assist in determining the position of the mobile station, specifically: first, determine the orientation angle information of the mobile station according to a set of data, and then determine The position of the base station transmitting antenna is a ray starting from the position of the mobile station, and then the distance between the mobile station and the base station transmitting antenna is determined according to the TA auxiliary measurement. At this time, the position of the mobile station is expressed as a circle centered on the base station transmitting antenna, with The distance value is a circular trajectory with a radius, so that the position information of the mobile station can be determined from the intersection point of the ray and the circular trajectory.

As shown in Figure 2, when two or more sets of base station measurement data for different positions are obtained, at least two rays where the mobile station is located can be determined according to the direction angle information of the mobile station obtained from the measurement, and through the two The intersection point of the two rays determined by the azimuth angle determines the position information of the mobile station.

In order to have a further understanding of the present invention, the specific implementation process of the method of the present invention will be described below in conjunction with the accompanying drawings.

First of all, the calculation process of the direction angle of the mobile station involved in the specific implementation process of the method of the present invention is described, specifically including the following steps:

Step 1: Determine the received power value of the mobile station receiving signals from different cells at the same transmitting antenna position, and the direction angle of each cell;

Taking Figure 2 as an example, it is determined that the measurement results of the mobile station on the received signals of cell 1 and cell 2 at the same base station location are PR1 and PR2 respectively, and the direction angles of cell 1 and cell 2 are α and β respectively;

Step 2: Construct a system of equations for calculating and solving the direction angle of the mobile station according to the measurement results of the mobile station for different cell signals, as follows:

A+B=β-α;

PT1(A)=PR1+D1;

PT2(B)=PR2+D2;

Among them, A is the angle between the direction of the mobile station and the main direction of cell 1, B is the angle between the direction of the mobile station and the main direction of cell 2; D1 is the attenuation of the signal from cell 1 to the mobile station, and D2 is the attenuation of the signal from cell 2 to the mobile station Attenuation; PT1 is the transmit power of cell 1 in the direction of the mobile station, and is a function of A, PT2 is the transmit power of cell 2 in the direction of the mobile station, and is a function of B, PT1 and PT2 are based on the transmit power of the base station and Antenna direction gain map determination;

In the above equations, since cell 1 and cell 2 base stations are in the same geographic location, the transmission paths of cell 1 and cell 2 to the mobile station can be considered to be the same. Therefore, it can be considered that D1 and D2 are equal, that is, D1 =D2.

Step 3: Solve the above equations and solve the direction angles A and B of the mobile station. At this time, it can be determined that the mobile station is on the ray determined by the direction angle, as shown by the dotted arrow line in Figure 2.

The present invention will be further described below with an example of determining the specific location information of the mobile station by using the direction angle information of the mobile station.

The specific embodiment is shown in Fig. 2, wherein, the position of base station 2 is (104.1576, 36.54742), and the position of base station 1 is (104.1288, 36.54573). In Fig. 2, the corresponding process of determining the position information of the mobile station is shown in Fig. 3 shown, including:

Step 31: Obtain the measurement report of each cell of the base station 2 reported by the mobile station;

It is known that the transmit power of each cell of base station 2 is the same, the measurement report of 1 cell of base station 2 reported by the mobile station to the network side is 38dbi, the measurement report of 2 cells of base station 2 is 16dbi, and the measurement report of 3 cells of base station 2 32dbi;

Step 32: Construct the equations required for calculating the orientation angle information of the mobile station according to the method described above, and solve the orientation angles of the mobile station relative to each cell according to the equations. The specific method for calculating the orientation angle of the mobile station has been described above , which will not be described in detail here;

Step 33: According to the obtained direction angle information of the mobile station relative to the position of the transmitting antenna, it can be determined that the mobile station is in the L1 direction shown in FIG. 2 . L1 is located between cell 1 and cell 3, and is biased towards cell 1.

Step 34: Obtain the measurement report for each cell of base station 1 reported by the mobile station, and the transmit power of each cell of base station 1 is the same; assume that the obtained measurement report is: the measurement report for 1 cell of base station 1 reported by the mobile station is 34dbi, The measurement report for cell 2 of base station 1 is 35dbi;

Step 35: Construct the equations needed to calculate the direction angle information of the mobile station relative to the position of the transmitting antenna of the base station 2, and solve to obtain the direction angle information of the mobile station;

Step 36: According to the direction angle information of the mobile station, it can be determined that the mobile station is in the direction of L2, and L2 is slightly biased towards the direction of cell 2 in cell 1 and cell 2;

Step 37: Determine the intersection point where L1 and L2 intersect, and the intersection point is the position of the mobile station, so as to obtain the position estimation result of the mobile station.

It should be noted that there is no sequential execution relationship between steps 31 to 33 and steps 34 to 36 in the above processing process, as long as the direction angle information of the mobile station relative to the two base stations is calculated, the direction angle information of the mobile station can be determined through step 37. Position estimation results.

In addition, for the situation shown in Figure 2, assuming that only the azimuth angle information of the mobile station in base station 1 or base station 2 is obtained through calculation, TA can be used to assist in obtaining the position estimation result of the mobile station, specifically: according to the TA measurement The circular trajectory position information of the mobile station is determined, the linear trajectory information of the mobile station is determined according to the direction angle information, and then the intersection point of the circular trajectory and the linear trajectory can be used as the position estimation result for the mobile station.

The present invention also provides a device for realizing mobile station positioning in a wireless communication system, as shown in Figure 4 and Figure 5, specifically including the following functional modules:

(1) Received signal power measurement module

This module is set in the mobile station, and is used to measure the signal power value information of the mobile station receiving different cells with the same base station location;

(2) Direction angle information calculation module

Calculate the direction angle information of the mobile station relative to each cell according to the measurement results of the received signal power measurement module and the direction angles of each cell. The specific method of calculating the direction angle information of the mobile station relative to each cell has been described above, and will not be detailed here. stated;

(3) Positioning processing module

Determine the position information of the mobile station according to the direction angle information of the mobile station calculated by the direction angle information calculation module relative to each cell. In the specific positioning process, according to the amount of the direction angle information of the mobile station obtained, the following two methods can be used Realization of specific positioning processing module results;

The first positioning processing module is shown in Figure 4, specifically including:

TA-assisted positioning module: determine the distance between the mobile station and the base station through TA-assisted positioning;

The first mobile station location information calculation module: determine the location information of the mobile station according to the direction information of the location of the mobile station and the distance between the mobile station and the base station determined by the TA-assisted positioning module.

The second positioning processing module is shown in Figure 5, specifically including:

The second mobile station position information calculation module: calculate the direction information of the mobile station position relative to the positions of at least two base stations according to the direction angle information, determine the intersection point of the two directions, and use the determined intersection point as the position of the mobile station information.

In summary, since the present invention determines the direction angle information of the mobile station relative to the base station position according to the information in the measurement report reported by the mobile station, and determines the position of the mobile station, the present invention can calculate and determine the location of the wireless communication system relatively easily. The position of the mobile station in the mobile station can effectively improve the processing efficiency for the positioning of the mobile station.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1, realize the method for mobile position estimation in a kind of wireless communication system, it is characterized in that, comprising:

A, measurement travelling carriage receive the received power value of the identical different districts signal in transmitting antenna position;

B, calculate according to the deflection of the received power value of the different districts signal that measure to obtain and each sub-district and to determine the deflection information of travelling carriage with respect to transmitting antenna position, sub-district;

C, carry out mobile position estimation according to described deflection information with respect to transmitting antenna position, sub-district.

2, realize the method for mobile position estimation in the wireless communication system according to claim 1, it is characterized in that described steps A comprises:

Determine two adjacent sub-districts at travelling carriage place according at least one group of the measurement report that travelling carriage reports, and measure the performance number that travelling carriage receives at least one group of described two neighbor cell signals at each identical sub-district of transmitting antenna position.

3, realize the method for mobile position estimation in the wireless communication system according to claim 1, it is characterized in that described step B comprises:

According to the signal measurement result of travelling carriage,, calculate the deflection of travelling carriage with respect to each transmitting antenna position, sub-district in conjunction with the deflection of each sub-district and the directional characteristic of transmitting antenna to the identical different districts in transmitting antenna position.

4, realize the method for mobile position estimation in the wireless communication system according to claim 1, it is characterized in that described step B specifically comprises:

B1, foundation are used to calculate the equation group of travelling carriage with respect to the deflection information of each sub-district:

A+B＝β-α；

PT1(A)＝PR1+D1；

PT2(B)＝PR2+D2；

Wherein, A and B be respectively the travelling carriage that need find the solution with respect to the deflection of transmitting antenna position respectively with the angle of the first sub-district deflection and the second sub-district deflection, β and α are respectively the deflection value of first sub-district and second sub-district, PT1 (A) and PT2 (B) first sub-district and second sub-district transmission power level on this direction of location of mobile station, PR1 and PR2 are the signal power value that travelling carriage receives first sub-district and second sub-district, D1 and D2 are the decay to travelling carriage of first sub-district and second cell signal, and D1=D2;

B2, the equation group of listing according to step B1 calculate determine described travelling carriage with respect to the deflection of base station transmit antennas position respectively with the included angle A and the B of the first sub-district deflection and the second sub-district deflection.

5, according to the method that realizes mobile position estimation in claim 1,2, the 3 or 4 described wireless communication systems, it is characterized in that described step C comprises:

When calculate obtaining travelling carriage,, and adopt the auxiliary positional information of determining travelling carriage of Timing Advance TA then according to this deflection information with respect to the deflection information of transmitting antenna position, sub-district.

6, according to the method that realizes mobile position estimation in claim 1,2, the 3 or 4 described wireless communication systems, it is characterized in that described step C comprises:

When calculate obtaining travelling carriage with respect to the deflection information of two or more different transmitting antenna positions, then determine the straight line at travelling carriage place respectively, and determine the positional information of travelling carriage according to the intersection point of each straight line according to deflection information with respect to the different transmit antennas position.

7, realize the device of mobile position estimation in a kind of wireless communication system, it is characterized in that, comprising:

Received signal power measurement module: be arranged in the travelling carriage, be used to measure the received power value of the signal of the variant sub-district that need report;

Deflection information calculations module: utilize the directional characteristic of transmitting antenna, the received power measurement result that reports according to travelling carriage and each sub-district transmitting antenna positional information calculation travelling carriage are with respect to the deflection information of each transmitting antenna position, sub-district;

The localization process module; Calculate the travelling carriage that obtains is determined travelling carriage with respect to the deflection information of each transmitting antenna position, sub-district positional information according to deflection information calculations module.

8, realize the device of mobile position estimation in the wireless communication system according to claim 7, it is characterized in that described localization process module comprises:

TA auxiliary positioning module: determine distance between travelling carriage and the base station by the TA assist location;

The first location of mobile station information calculations module: the positional information that travelling carriage of determining with respect to the deflection information of transmitting antenna position, a sub-district and TA auxiliary positioning module according to location of mobile station and the distance between the base station are determined travelling carriage.

9, realize the device of mobile position estimation in the wireless communication system according to claim 7, it is characterized in that described localization process module comprises:

The second location of mobile station information calculations module: the intersection point that intersects with respect to the deflection of two or more different transmitting antenna positions according to location of mobile station is determined the positional information of travelling carriage.

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