WO2013159592A1

WO2013159592A1 - Uplink pilot signal-based wireless positioning method and device

Info

Publication number: WO2013159592A1
Application number: PCT/CN2013/071920
Authority: WO
Inventors: 邓单; 陈立俊
Original assignee: 京信通信系统（中国）有限公司
Priority date: 2012-04-23
Filing date: 2013-02-27
Publication date: 2013-10-31
Also published as: CN102665275A

Abstract

Proposed is an uplink pilot signal-based wireless positioning method, comprising the steps of: guiding a target terminal to send uplink pilot signals to the network side; respectively measuring a positioning parameter of each of the uplink pilot signals which are sent by the target terminal and received by each signal access point in the same access time slot; and according to the positioning parameter and a position algorithm, determining the position of the target terminal. Also proposed is an uplink pilot signal-based wireless positioning device, which can achieve wireless positioning without modifying the existing communication standard, and at the same time can reduce the cost.

Description

Wireless positioning method and device based on uplink pilot signal

The present invention relates to positioning technologies, and in particular, to a wireless positioning method and apparatus based on uplink pilot signals. Background technique

The Global Positioning System (GPS) provides good positioning and time service in outdoor spaces. However, in the occlusion environment of the building, the GPS does not work properly due to the weak signal. With the continuous improvement and improvement of wireless communication networks, people can use the cellular network to complete indoor wireless positioning by using signal coverage in the room.

In the wireless positioning technology, a method in which a terminal transmits an uplink specific radio positioning signal is generally used, and the precise position of the terminal can be indirectly calculated. However, this method requires modifying the terminal so that the terminal transmits a specific wireless positioning signal, and the existing communication standard needs to be modified, so that a large number of existing terminals cannot obtain the positioning service. Therefore, how to provide location services without modifying existing terminals and communication standards has become a technical problem that the industry urgently needs to solve. Summary of the invention

The object of the present invention is to propose a wireless positioning method based on an uplink pilot signal, which can realize wireless positioning without modifying existing communication standards, and at the same time reduce cost.

In order to achieve the above objectives, the technical solution adopted is:

A wireless positioning method based on an uplink pilot signal, comprising the steps of:

Directing the target terminal to send an uplink pilot signal to the network side;

Measure the positioning parameters of the uplink pilot signal sent by the target terminal in the same access slot received by each signal access point, respectively;

Determining a location of the target terminal according to the positioning parameter.

The method of the invention utilizes the uplink pilot signal in the existing communication standard, and separately measures the arrival time difference or power information of the same uplink pilot signal through the signal access point, and then calculates the precise position of the terminal by using the corresponding position algorithm. There is no need to modify existing communication standards, reducing network deployment costs.

The object of the present invention is to provide a wireless positioning apparatus based on an uplink pilot signal, which can realize wireless positioning without modifying existing communication standards, and at the same time reduce cost.

In order to achieve the above objectives, the technical solution adopted is:

A wireless positioning device based on an uplink pilot signal, comprising:

a guiding unit, configured to direct the target terminal to send an uplink pilot signal to the network side; a measuring unit, configured to separately measure a positioning parameter of an uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

a location determining unit, configured to determine a location of the target terminal according to the positioning parameter.

The device of the invention utilizes the uplink pilot signal in the existing communication standard, respectively measures the arrival time difference or power information of the same uplink pilot signal through the signal access point, and calculates the precise position of the terminal through the corresponding position algorithm. There is no need to modify existing communication standards and reduce network deployment costs. DRAWINGS

Figure 1 is a flow chart of one embodiment of the method of the present invention;

2 is a schematic diagram of a positioning algorithm in the present invention;

Figure 3 is a schematic illustration of the apparatus of the present invention. detailed description

For ease of understanding, the following will be explained in conjunction with the drawings.

Referring to FIG. 1, the present invention provides a wireless positioning method based on an uplink pilot signal. When the target terminal is in a signal access point without a preset, the method includes the following steps:

101. Setting a signal access point;

Set multiple signal access points in the target area. Specifically, κ signal access points are set in the target area; preferably, κ signal access points are uniformly arranged in the target area; may be placed as vertices of the target area, or may be uniformly placed in the target area according to coverage requirements Internal, but generally no less than three.

102. Send an uplink pilot signal.

The guiding target terminal transmits an uplink pilot signal to the network side. For the target terminal, the terminal is redirected to initiate a random access procedure by air interface signaling, and the target terminal sends an uplink pilot signal to the network side. For different communication systems, the uplink pilot signals are different, for example: For the TD-SCDMA system, it may be an uplink pilot time slot signal or a random access signal; for the LTE/WCDMA system, it refers to a random access signal.

103. Measure a positioning parameter of a signal received by the signal access point;

The positioning parameters of the uplink pilot signal transmitted by the target terminal in the same access slot received by each signal access point are respectively measured.

104. Determine a target location according to the positioning parameter.

The method of the invention utilizes the uplink pilot signal in the existing communication standard, respectively measures the arrival time difference or power information of the same uplink pilot signal through the signal access point, and calculates the precise position of the terminal through the corresponding position algorithm. no need for correction Existing communication standards reduce network deployment costs.

In the above embodiment, if there is a signal access point set in advance, the above 101 steps may be omitted.

The positioning parameter in the foregoing step 103 is a time for each signal access point to receive an uplink pilot signal sent by the target terminal in the same access slot;

In step 104, the location of the target terminal is determined according to the arrival time difference algorithm and the positioning parameter. Specifically, the time difference of arrival (0TDA) algorithm is as follows:

The UE position is determined by detecting the time difference of arrival of signals in the three different signal access points. As shown in FIG. 2, the UE is located on a hyperbola focusing on two base stations;

Assuming that the coordinates of the terminal UE are (x, y), the location coordinates of the base station i (ie, the signal access point) are (^, ), the time at which the base station i transmits the signal is Ti, and the time at which the UE receives the signal is, i =l, 2, 3. Available from base station i:

0- +(yy _l )

C,

Where c is the speed of light.

Therefore, the time difference between the base station 1 and the base station 2 arriving at the UE can be obtained as an equation:

(X- +(yy ₂ ) -^(χ-χ,) +(yy

■{T ₂ -T _L ) + - The time difference between the arrival of the base station 1 and the base station 2 to the UE is obtained by the equation:

— χ ₃ ) + (yy ₃ ) -^(χ-χ,) +(yy _Y )

τ ₃ —τ, ϋ Since it is necessary to establish more than two hyperbolic equations for determining the position of the UE, the intersection of the two hyperbolas is the position coordinate of the UE with the base station 1 as the reference cell, then the equations can be obtained:

The difference in time of arrival of each of the different base stations can be directly obtained by the base station by estimating the difference in the uplink channel timing. The geographic coordinates of the UE can be obtained by solving the above equations.

Specifically, in the foregoing step 103, specifically, the positioning parameter is the power strength of the uplink pilot signal sent by the target terminal in the same access slot received by each signal access point; in step 104, according to the power difference matching algorithm or power The intensity difference algorithm and the positioning parameter determine the position of the target terminal; the following is an example based on the power difference matching algorithm - constructing a reference database for the target area: according to the resolution requirement, the target area is evenly divided into several sizes n*m data grid; use the UE to transmit the uplink pilot signal at the center of each data frame j, measure the signal strength of K access points ^, k=l, 2 K, and the intensity difference ^{D = P} - ^P -, k=2, ~K;

And together with the central coordinates of the above data grid to form a database element; the above measurement is performed at the center of each data grid to form a reference database; in the actual test, the UE signal power measured by one access point is recorded as ^M k=l, 2 , -K and corresponding measurement power

_3⁄4 N, = , -M, _ _{1 ) k=2)} ... _K; The measured power difference ^ is matched with the intensity difference in the reference database to find the most matching position point j, which is the UE geographical coordinate.

Also included after step 104 is returning the location to the target terminal.

The device of the present invention is described below. Referring to FIG. 3, the present invention provides a wireless positioning apparatus based on an uplink pilot signal, including:

The guiding unit T1 is configured to guide the target terminal to send an uplink pilot signal to the network side;

The measuring unit Τ2 is configured to separately measure positioning parameters of the uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

The location determining unit Τ3 is configured to determine the location of the target terminal according to the positioning parameter and the location algorithm.

The device of the invention utilizes the uplink pilot signal in the existing communication standard, and separately measures the arrival time difference or power information of the same uplink pilot signal through the signal access point, and then calculates the precise position of the terminal by using the corresponding position algorithm. There is no need to modify existing communication standards, reducing network deployment costs.

The measurement unit Τ2 measures the positioning parameter for the time of the uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

The position determining unit Τ3 determines the position of the target terminal based on the arrival time difference algorithm and the positioning parameter.

Measurement unit Τ2 The measured positioning parameter is the power intensity of the uplink pilot signal transmitted by the target terminal in the same access slot received by each signal access point;

The position determining unit Τ3 determines the position of the target terminal based on the power difference matching algorithm or the power intensity difference algorithm and the positioning parameter.

The guiding unit T1 guides the target terminal to send an uplink pilot signal to the network side through air interface signaling.

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

Rights request

A wireless positioning method based on an uplink pilot signal, characterized in that it comprises:

2. The method for wireless positioning based on uplink pilot signals according to claim 1, wherein:

If there is no signal access point around the target terminal, then no less than 3 signal access points are uniformly disposed around the target terminal, and then the step of guiding the target terminal to send an uplink pilot signal to the network side is performed.

3. The method for wireless positioning based on uplink pilot signals according to claim 1, wherein:

The positioning parameter is a time of an uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

In the step of determining the target terminal location according to the positioning parameter, determining the location of the target terminal according to the arrival time difference algorithm and the positioning parameter.

4. The method for wireless positioning based on an uplink pilot signal according to claim 1, wherein:

The positioning parameter is a power intensity of an uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

In the step of determining the target terminal location according to the positioning parameter, determining the location of the target terminal according to the power difference matching algorithm or the power intensity difference algorithm and the positioning parameter.

5. The method for wireless positioning based on uplink pilot signals according to claim 1, wherein:

The target terminal is configured to send an uplink pilot signal to the network side by air interface signaling.

The method for wireless positioning based on an uplink pilot signal according to any one of claims 1 to 5, wherein after determining the location of the target terminal, the location is returned to the target terminal.

A wireless positioning device based on an uplink pilot signal, comprising:

a guiding unit, configured to direct the target terminal to send an uplink pilot signal to the network side;

a measuring unit, configured to separately measure positioning parameters of the uplink pilot signal sent by the target terminal in the same access slot received by each signal access point;

a location determining unit, configured to determine a target terminal location according to the positioning parameter.

8. The uplink pilot signal based wireless positioning apparatus according to claim 7, wherein: The positioning parameter measured by the measuring unit is a time when each signal access point receives an uplink pilot signal sent by the target terminal in the same access slot;

The location determining unit determines a location of the target terminal according to an arrival time difference algorithm and the positioning parameter.

9. The uplink pilot signal based wireless positioning apparatus according to claim 7, wherein:

The positioning parameter measured by the measuring unit is that each signal access point receives the power intensity of the uplink pilot signal sent by the target terminal in the same access slot;

The location determining unit determines a location of the target terminal according to a power difference matching algorithm or a power intensity difference algorithm, the positioning parameter.

10. The uplink pilot signal based wireless positioning apparatus according to any one of claims 6 to 9, wherein:

The guiding unit directs the target terminal to send an uplink pilot signal to the network side by air interface signaling.