JP2013195356A - Positioning method for radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positioning method for radio systems that eliminates the necessity for a mobile station device to include a GPS signal receiving unit and that has the mobile station device simply determine its position using reference position information obtained from GPS assist data received over a communication network.SOLUTION: Upon detecting a plurality of cells, a mobile station device 1 transmits a GPS assist data request including information on the detected cells, to a base station device 2. Upon receiving GPS assist data corresponding to the GPS assist data request from the base station device 2, the mobile station device 1 obtains each reference position and an error radius from the GPS assist data corresponding to the plurality of detected cells, calculates each reference area, and determines the center of gravity of an intersection of the reference areas as an approximate position of the mobile station device.

Description

  The present invention relates to a positioning method for a wireless system, and more particularly, to a positioning method for a wireless system that easily performs positioning of a mobile station apparatus using assist data including reference position information.

[Conventional technology]
Conventionally, positioning using GPS (Global Positioning System) has been applied to various positioning. In particular, in recent years, it has been widely applied to positioning of mobile station apparatuses in wireless systems such as mobile phones.

  In order to speed up the positioning calculation in such a mobile station apparatus, a method of using GPS assist data including satellite orbit information and reference position information provided from GPS satellites is used. For example, the reference position information is information such as “North latitude 43 degrees 04 minutes 07 seconds, East longitude 141 degrees 21 minutes 03 seconds, error radius 100 m”.

  A conventional mobile station device includes a GPS signal receiving unit that receives a GPS signal from a GPS satellite, and the mobile station device itself performs a positioning calculation using GPS assist data and a GPS signal to calculate a current position with high accuracy. Was.

[Related technologies]
As related prior art, Japanese Patent Laid-Open No. 2001-289933 “Positioning system and position calculation method in mobile communication system” (Hitachi Kokusai Electric) [Patent Document 1], Japanese Patent Laid-Open No. 2010-219755 “Wireless”. Communication terminal "(Hitachi Kokusai Electric Inc.) [Patent Document 2].

  In Patent Document 1, the position calculation means based on three points of the mobile station apparatus calculates the difference in distance between the mobile station apparatus and each base station apparatus from the position information from the three base station apparatuses, and The position of the mobile station apparatus is measured from the difference and stored in the storage unit as the previous position information. The two-point position calculation means determines whether the mobile station apparatus and each base station apparatus use the position information from the two base station apparatuses. It is shown that the distance difference is calculated, and the current position of the mobile station apparatus is calculated from the position information, the distance difference, and the previous position information of the mobile station apparatus stored in the storage unit.

  Patent Document 2 acquires position information of a wireless communication terminal using a received GPS signal, receives and acquires map information including a base station installation status from a base station, and acquires the acquired map information and the wireless communication terminal. It is shown that a base station search process is executed based on position information to determine a base station to be connected.

JP 2001-289933 A JP 2010-219755 A

  However, the conventional positioning method in the mobile station apparatus has a problem that the apparatus becomes expensive because the mobile station apparatus itself is provided with a GPS signal receiving unit to perform positioning calculation.

  Also, depending on the method of use, it may not be necessary to calculate the current position with high accuracy, and it does not meet the requirement that the approximate position should be known by a simpler method or a cheaper method than the conventional positioning method. Is.

  The present invention has been made in view of the above circumstances, and it is not necessary for the mobile station apparatus to include a GPS signal receiving unit, and the mobile station apparatus uses reference position information obtained from GPS assist data received via a communication network. An object of the present invention is to provide a positioning method of a wireless system that performs positioning easily.

  The present invention for solving the problems of the above conventional example is a positioning method of a radio system having a base station device that manages a cell and a mobile station device that is wirelessly connected to the base station device, and the mobile station device When a plurality of cells are detected, a GPS assist data request including information on the detected cells is transmitted to the base station apparatus, and GPS assist data corresponding to the GPS assist data request is received from the base station apparatus. Each reference position and error radius are obtained from GPS assist data corresponding to a plurality of cells, each reference area is calculated, and the center of gravity of the intersection of the reference areas is set as a simple position of the mobile station apparatus. To do.

  The present invention is characterized in that, in the positioning method of the wireless system, a base station apparatus that has received a GPS assist data request or a server connected to the base station apparatus transmits GPS assist data corresponding to a plurality of detected cells. To do.

  According to the present invention, in the positioning method of the wireless system, the mobile station device transmits the GPS assist data request to the base station devices of a plurality of cells, and each base station device transmits corresponding GPS assist data to the mobile station device. It is characterized by transmitting.

  According to the present invention, in the positioning method of the wireless system, the mobile station device transmits a specific signal to the detected base station devices of a plurality of cells, receives a response signal for the specific signal, and returns from the transmission of the specific signal. A distance from each base station apparatus is calculated based on a response period until signal reception, and the distance is used instead of an error radius.

  In the positioning method in the mobile station apparatus, when the mobile station apparatus detects a plurality of cells, the mobile station apparatus transmits a GPS assist data request including information on the detected cells to the base station apparatus. When the GPS assist data corresponding to the request is received from the base station apparatus, each reference position and error radius are obtained from the GPS assist data corresponding to the detected plurality of cells, each reference area is calculated, and the reference area The center of gravity of the intersection is the simple position of the mobile station device.

  According to the present invention, when the mobile station apparatus detects a plurality of cells, the mobile station apparatus transmits a GPS assist data request including information on the detected cells to the base station apparatus, and the GPS assist data corresponding to the GPS assist data request is transmitted. When the data is received from the base station apparatus, each reference position and error radius are obtained from the GPS assist data corresponding to the detected plurality of cells, each reference area is calculated, and the center of gravity of the intersection of the reference areas is calculated as the mobile station. Since the positioning method of the wireless system is a simple position of the device, the mobile station device does not need to have a GPS signal receiving unit, and moves using the reference position and error radius obtained from the GPS assist data received from the base station device. There is an effect that the position of the station device can be measured easily.

1 is a schematic diagram of a wireless system according to an embodiment of the present invention. It is a block diagram of the configuration of the mobile station apparatus. It is a figure which shows the definition of a reference area | region circle. It is a figure which shows the calculation position determination example (1) by simple positioning. It is a figure which shows the calculation position determination example (2) by simple positioning.

Embodiments of the present invention will be described with reference to the drawings.
[Outline of the embodiment]
The positioning method of the radio system according to the embodiment of the present invention is based on a reference area from a reference position and an error radius included in reference position information among assist data received via a communication network for a cell detected by a mobile station apparatus. Since the mobile station apparatus performs simple positioning based on the reference area and calculates its position, the mobile station apparatus does not need to have a GPS signal receiver, and the position of the mobile station apparatus can be easily Can be calculated.

[This wireless system: Fig. 1]
A wireless system (present wireless system) according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram of a radio system according to an embodiment of the present invention.
As shown in FIG. 1, the radio system includes mobile station apparatuses 1a and 1b (which may be simply referred to as “1”) and base station apparatuses 2a and 2b (which are simply referred to as “2”). A positioning server 3 and a network 4.

[Parts of this wireless system]
Each part of the wireless system will be specifically described.
The mobile station apparatus 1 is a terminal apparatus that is wirelessly connected to the base station apparatus 2 and performs telephone calls and data communication.
Further, the mobile station apparatus 1 receives assist data from the positioning server 3 or the base station apparatus 2 to acquire reference position information, forms a reference area based on the reference position and error radius in the information, and uses the reference area as a basis. The position of the mobile station device 2 is simply calculated.
A specific configuration of the mobile station apparatus will be described later.

The base station apparatus 2 forms a cell in the communication area, and transmits GPS assist data transmitted from the positioning server 3 via the network 4 to the mobile station apparatus 1.
Further, the base station device 2 may include a GPS signal receiving unit and transmit GPS assist data obtained from GPS satellites to the mobile station device 1 instead of the positioning server 3.

The positioning server 3 transmits GPS assist data related to the base station device 2 of the cell detected by the mobile station device 1 based on the positioning request from the mobile station device 1 to the base station device 2 via the network 4.
Therefore, the positioning server 3 stores GPS assist data related to the base station device 2 in advance, inputs cell information detected by the mobile station device 1 as a positioning request, and extracts GPS assist data of the detected cell. Send to network 4.
The network 4 is a communication network that connects the base station device 2 and the positioning server 3 or other processing devices.

[Mobile station apparatus: FIG. 2]
Next, the mobile station apparatus of this wireless system will be described with reference to FIG. FIG. 2 is a configuration block diagram of the mobile station apparatus.
As shown in FIG. 2, the mobile station apparatus includes a radio unit 101, a peripheral station search unit 102, a baseband transmission / reception unit 104, an assist data processing unit 105, a reference position acquisition unit 106, and a simple positioning unit 107. The main control unit 108 is provided.

[Each part of mobile station equipment]
The radio unit 101 performs band conversion from a radio frequency band signal communicated between the base station apparatus 2 and the mobile station apparatus 1 of the radio system to a baseband signal, and from the baseband signal to the radio frequency band signal. Band conversion.

The peripheral station search unit 102 searches for a cell that can be detected from the point where the mobile station device 1 is located.
The baseband transmission / reception unit 104 performs baseband demodulation processing and data decoding processing of the signal converted into the baseband band, and is a data code for transmitting data to the network 4 via the wireless unit 101 Processing and baseband modulation processing.

The assist data processing unit 105 acquires GPS assist data from the data demodulated by the baseband transmission / reception unit 104, and generates a message (GPS assist data request message) for requesting GPS assist data from the network side (positioning server 3). And output to the transmission function of the baseband transceiver 104.
The reference position acquisition unit 106 acquires reference position information from the GPS assist data from the assist data processing unit 105.

The simple positioning unit 107 simply calculates the current position using reference position information of a plurality of cells that can be calculated from the point where the mobile station apparatus is located.
The main control unit 108 controls each unit and executes call processing, positioning processing, and the like as a mobile station device.
Specific contents of the positioning process will be described later.

[Positioning method]
[Standby status]
First, the mobile station apparatus 1 enters a standby state after performing location registration in a radio system located in the cell area of the base station apparatus 2. Also in this location registration, the mobile station apparatus 1 performs cell detection and selects an optimum cell.

[GPS assist data acquisition]
When the mobile station device 1 has a request for positioning (GPS assist data request) to the positioning server 3 while waiting, or a request for location information from the network side (positioning server 3) to the mobile station device 1 If there is, the mobile station apparatus 1 establishes a communication link with the network, communicates with the positioning server 3, and acquires GPS assist data necessary for positioning from the positioning server 3.
The base station device 2 may include a GPS signal receiving unit, and the GPS assist data acquired by the receiving unit may be periodically distributed to the mobile station device 1 in the cell.
Further, the positioning server 3 may transmit the GPS assist data to each base station device 2 of the detected cell, and transmit each GPS assist data from each base station device 2 to the mobile station device 1. .

[Search neighboring cells]
In addition, the mobile station apparatus 1 operates to connect to the optimum cell (connect to the base station apparatus having the best communication quality) while changing the serving cell as the mobile station apparatus is on standby or in communication.
For example, in the case of a code divisional multiple access (CDMA) system, the mobile station apparatus 1 moves through a so-called diversity handover state in which a plurality of cells are connected simultaneously in the process of movement of a serving cell.
That is, the peripheral station search unit 102 of the mobile station apparatus 1 searches for a peripheral cell of the serving cell in order to detect a diversity handover candidate cell or to move to a cell of higher quality.

[Specific detection method of neighboring cells]
A method for detecting neighboring cells of the mobile station apparatus 1 in this wireless system will be described. Here, a CDMA system will be described as an example, but this embodiment can be applied to a radio system other than CDMA.
While the mobile station apparatus 1 is waiting, the radio unit 101 digitally converts the baseband signal, and the peripheral station search unit 102 searches for a peripheral cell using the converted baseband signal.

As a result of searching for neighboring cells, the main control unit 108 is notified of the cells detected at the current position of the mobile station apparatus 1.
The main control unit 108 stores information on the cells detected from the current position of the mobile station apparatus 1 and periodically performs a neighboring cell search. If there is an update in the detected cell, the updated cell information Remember.

[Specific positioning method of mobile station apparatus]
A specific positioning method of the mobile station apparatus 1 in this wireless system will be described.
When there is a positioning request in the mobile station apparatus 1, the main control unit 108 establishes a communication link with the stored detection cell in order to acquire GPS assist data necessary for positioning, and thereafter In response to an instruction from the control unit 108, the assist data processing unit 105 creates message data for requesting GPS assist data (GPS assist data request message).
This GPS assist data request message includes information on detected cells stored in the main control unit 108.

The GPS assist data request message is subjected to data encoding processing and baseband modulation processing for transmitting message data to the network in the baseband transmission / reception unit 104.
The baseband modulated message data is wirelessly modulated by the wireless unit 101 and transmitted to the network side (positioning server 3).

The positioning server 3 on the network side receives the GPS assist data request message and transmits the GPS assist data corresponding to the cell detected by the mobile station device 1 via the base station device 2.
That is, the positioning server 3 stores GPS assist data corresponding to a plurality of cells in advance in the storage unit, extracts the GPS assist data corresponding to the detected cell, and transmits it to the network 4.

In the mobile station apparatus 1 that has received the GPS assist data, the radio unit 101 performs frequency conversion and quadrature detection, becomes an in-phase component signal and a quadrature component signal, converts the signal into a digital signal, and outputs the digital signal to the baseband transceiver unit 104. The
The baseband transmission / reception unit 104 performs baseband reception processing such as despreading, synchronous detection, and decoding of the GPS assist data signal using the digitally converted baseband signal.

The assist data processing unit 105 separates the assist data signal subjected to the baseband reception process into various assist data.
The reference position acquisition unit 106 acquires a portion corresponding to the reference position information in the separated assist data, extracts the reference position and error radius information, and outputs the information to the simple positioning unit 107.

  Further, the main control unit 108 acquires assist data similar to the above for all of the detection cells to be stored, acquires information on the reference position and error radius, and outputs the information to the simple positioning unit 107.

[Position calculation method: FIGS. 3 to 5]
Next, the position calculation method of the mobile station apparatus in this radio | wireless system is demonstrated, referring FIGS. FIG. 3 is a diagram showing the definition of the reference area circle, FIG. 4 is a diagram showing a calculation position determination example (1) by simple positioning, and FIG. 5 is a calculation position determination example (2) by simple positioning. FIG.
Note that the calculation of the position calculation of the mobile station apparatus 1 is performed by the simple positioning unit 107.

[Reference area circle: Fig. 3]
As shown in FIG. 3, the reference area circle is a circle whose radius is an error radius with the acquired reference position as the center, and it is considered that the mobile station apparatus 1 is within the range of the circle.
In FIG. 3, Rpa (Xa, Ya) is a reference position obtained from assist data from cell A, and Ra is an error radius obtained from assist data from cell A.

[Position from three detection cells: FIG. 4]
A position calculation method when a plurality of cells are detected will be described with reference to FIG.
As shown in FIG. 4, if three cells of cell A, cell B, and cell C are detected from the mobile station device 1, a reference area circle represented by a reference position and an error radius from the assist data from each cell. Is formed.
For each reference area circle, when the intersection of the circumference of the circle is represented by Cr ₁ , Cr ₂ , Cr ₃ , the mobile station device 1 exists in an area (and reference area) having these points as vertices It is thought that.

Therefore, in order to determine a specific position, the center of gravity of the intersection is calculated and used as the approximate position of the mobile station apparatus 1.
If the intersection points Cr ₁ (X1, Y1), Cr ₂ (X2, Y2), and Cr ₃ (X3, Y3) are assumed, the center of gravity EP (Xe, Ye) is expressed by the following equation.
EP (Xe, Ye) = [(X1 + X2 + X3) / 3, (Y1 + Y2 + Y3) / 3]
The center of gravity EP (Xe, Ye) is set as a calculated position by simple positioning of the mobile station apparatus 1.

[Position from four detection cells: FIG. 5]
Next, as shown in FIG. 5, when four cells are detected, there may be a case where there is no region in which all four of the reference regions from the four cells overlap.
In such a case, for example, consider an AND reference region of three of the four cells.

In the case of FIG. 4, the reference region formed by cells A, B and D having Cr ₁ , Cr ₂ and Cr ₃ as vertices, and cells A, B and C having vertices as Cr ₄ , Cr ₅ and Cr ₆ are used. There are two and reference regions formed of C.
The position is calculated by simple positioning of the mobile station device 1 by obtaining the center of gravity of the vertices of the two reference areas.

Suppose that the vertices of the two reference areas are Cr ₁ (X1, Y1), Cr ₂ (X2, Y2), Cr ₃ (X3, Y3), Cr ₄ (X4, Y4), Cr ₅ (X5, Y5), When Cr ₆ (X6, Y6) is set, the center of gravity EP (Xe, Ye) is expressed by the following equation.
EP (Xe, Ye) = [(X1 + X2 + X3 + X4 + X5 + X6) / 6
(Y1 + Y2 + Y3 + Y4 + Y5 + Y6) / 6]
The center of gravity EP (Xe, Ye) is set as a calculated position by simple positioning of the mobile station apparatus 1.

[Application example]
In order to improve the accuracy of the position calculation of the mobile station apparatus 1, the time until the mobile station apparatus 1 transmits a specific signal to the base station of the detected cell and the response signal of the specific signal returns ( In the response period), the distance between the base station apparatus 2 and the mobile station apparatus 1 is calculated, and the distance is used instead of the error radius.

  Further, the base station 2 measures the attenuation amount of the specific signal from the mobile station device 1 to the base station device 2, calculates the distance between the base station device 2 and the mobile station device 1 based on the attenuation amount, The distance may be used instead of the error radius. Also in this case, there is an effect that the accuracy of the position calculation of the mobile station apparatus 1 can be improved.

[Effect of the embodiment]
According to this wireless system, the mobile station apparatus 1 does not include a GPS signal receiving unit, and the mobile station apparatus 1 can be simply calculated from the reference area in the assist data received via the communication network and the reference area based on the error radius. Therefore, the configuration of the mobile station apparatus 1 can be simplified, and the position calculation can be realized by an easy calculation.

  The present invention is a wireless system in which a mobile station device does not need to have a GPS signal receiving unit, and the mobile station device can easily perform positioning using reference position information obtained from GPS assist data received via a communication network. Suitable for positioning method.

  DESCRIPTION OF SYMBOLS 1 ... Mobile station apparatus, 2 ... Base station apparatus, 3 ... Positioning server, 4 ... Network, 101 ... Radio | wireless part, 102 ... Peripheral station search part, 104 ... Base Band transmission / reception unit, 105 ... Assist data processing unit, 106 ... Reference position acquisition unit, 107 ... Simple positioning unit, 108 ... Main control unit

Claims (5)

A positioning method for a wireless system comprising a base station device for managing a cell and a mobile station device wirelessly connected to the base station device,
When the mobile station apparatus detects a plurality of cells, the mobile station apparatus transmits a GPS assist data request including information on the detected cells to the base station apparatus, and the GPS assist data corresponding to the GPS assist data request is transmitted to the base station apparatus. When receiving from the base station apparatus, each reference position and error radius are obtained from the GPS assist data corresponding to the detected plurality of cells, each reference area is calculated, and the center of gravity of the intersection of the reference areas is calculated by the mobile station. A positioning method characterized by a simple position of the device.   The positioning method according to claim 1, wherein the base station apparatus that has received the GPS assist data request or a server connected to the base station apparatus transmits GPS assist data corresponding to a plurality of detected cells. The mobile station device transmits the GPS assist data request to the base station device of the plurality of cells that detected the request,
The positioning method according to claim 1, wherein GPS assist data corresponding to each base station device is transmitted to the mobile station device.   The mobile station device transmits a specific signal to the detected base station devices of a plurality of cells, receives a response signal to the specific signal, and based on a response period from transmission of the specific signal to reception of the response signal 4. The positioning method according to claim 1, wherein a distance to each base station apparatus is calculated and the distance is used instead of an error radius. A positioning method in a mobile station device,
When the mobile station apparatus detects a plurality of cells, the mobile station apparatus transmits a GPS assist data request including information on the detected cells to the base station apparatus, and transmits the GPS assist data corresponding to the GPS assist data request to the base station. When receiving from the station apparatus, the respective reference positions and error radii are obtained from the GPS assist data corresponding to the detected plurality of cells, the respective reference areas are calculated, and the center of gravity of the intersection of the reference areas is calculated. A positioning method characterized by a simple position.

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