KR20060028235A - Method for acquring gps information using a mobile communication terminal having gps function - Google Patents

Abstract

The present invention relates to a method for acquiring GPS information of a mobile communication terminal equipped with a GPS function. The present invention relates to a method for acquiring GPS information received from GPS satellites. If it is determined not to be connected to a radio frequency link through a mobile communication terminal equipped with a homogeneous GPS function that is tracked as being located at a short distance belonging to the same group and PtoP (Peer To Peer) communication such as Push To Talk (PTT) and Call to obtain the necessary GPS information from a mobile communication terminal equipped with the same GPS function. In this case, if it is determined that the GPS information received from the obtained mobile communication terminal with other GPS functions is not available as well, By acquiring the necessary GPS information from the wireless base station, other GPS located close to the local area when the initial location information of the satellite cannot be obtained. Not only can it greatly reduce TTFF (Time To First Fix) by receiving it, but it can also be equipped with other similarly located GPS functions in close proximity if the GPS information required for some reason cannot be obtained or the reliability of the stored GPS information is low. The GPS information can be obtained from the mobile communication terminal to perform efficient GPS operation.

GPS, PTT, Location, Satellite, Information, Wireless, Frequency, Link

Description

Method for acquring GPS information using a mobile communication terminal having GPS function

1 conceptually illustrates a system to which the present invention is applied;

2 is a view for explaining an example of a system to which the present invention is applied;

3 is a diagram illustrating a mobile communication terminal equipped with a GPS function to which the present invention is applied;

4 is a view showing a GPS packet according to the present invention;

5 to 7 are diagrams illustrating a GPS information acquisition method of a mobile communication terminal equipped with a GPS function according to the present invention.

Explanation of symbols on the main parts of the drawings

300: telephone call unit 310: change demodulator

320: GPS receiving module 330: geomagnetic sensor module

340: temperature sensor module 350: barometric pressure sensor module

360: map storage unit 370: central processing unit

380 display unit 390 command input unit

400: memory 410: PTT transmitter / receiver

According to the present invention, when it is not possible to initially obtain accurate position information of a satellite, the present invention can not only dramatically reduce the time to first fix (TTFF) by receiving from another GPS located at a short distance, but also obtain necessary GPS information for some reason. If the reliability of the missing or stored GPS information is low, the desired GPS information can be obtained from a mobile communication terminal equipped with other GPS functions of the same type located at a short distance, so that efficient GPS operation can be performed. It relates to a method of obtaining information.

With the development of the position acquisition technology using the Global Positioning System (GPS) and the field of telematics, a multimedia system used for moving objects such as a vehicle, the need for a low-cost navigation system is steadily being raised.

The navigation system includes a position acquisition module capable of acquiring current position information of a predetermined moving object, a path calculating module for calculating a moving path of the moving object, and a path guide module. It also utilizes mobile communication such as over-the-air and Code Division Multiple Access (CDMA) to provide additional services.

In the case of broadcast waves such as FM (Frequency Modulation) broadcasting or DMB (Digital Multimedia Broadcasting), mutual communication is impossible, so communication means such as CDMA or Global System for Mobile communication (GSM) are basically required. The resulting cost of CDMA modems has hindered the development of low cost navigation systems.

In order to solve this problem, a low-cost service that can provide a navigation service using a mobile communication terminal that many users have recently appeared.

However, most of these navigation services use the mobile terminal as a monitor for simply displaying a modem and information for communication. That is, in a conventional navigation service using a mobile communication terminal, a user accesses a navigation service company with his mobile communication terminal, downloads map information and traffic information, and displays the downloaded map information and traffic information on the screen. Due to the time required for downloading map information and traffic information, there was a problem in that the movement of the moving object could not be guided in real time.

Therefore, in recent years, along with the development of mobile communication technology, there is a need for a mobile communication terminal capable of guiding the movement of a predetermined moving object in real time by integrating all functions necessary for a navigation system. Patent Application No. 2004-51687 (name of the invention: a method for guiding a mobile route of a mobile communication terminal) has been proposed.

However, a mobile communication terminal (hereinafter, abbreviated as "GPS phone") capable of operating such a navigation system, it is difficult to obtain accurate GPS satellite information until the position of the satellite is tracked after the system is operated. In addition, if the GPS error is located in the system error or the GPS information receiving area, the required GPS information cannot be obtained or the reliability of the loaded GPS information is significantly lowered. It is true.

Therefore, the present invention was developed to solve the above-mentioned problems, and when the initial location information of satellites cannot be obtained, the TTFF (Time To First Fix) can be drastically reduced by receiving from another GPS phone located at a short distance. In addition, if the necessary GPS information cannot be obtained for some reason or the reliability of the stored GPS information is low, the desired GPS information can be obtained from other similarly located GPS phones in a short distance, thereby enabling efficient GPS operation. The purpose is to provide a method of obtaining information.

In accordance with this object, the present invention, according to whether the predetermined GPS phone equipped with the GPS function is available in the internal storage, calling the same type of GPS phone belonging to the same group and sharing a predetermined radio frequency link From the called GPS phone, we want to acquire a set of GPS information such as GPS satellite array information required for initial setup.

To this end, if a predetermined GPS phone is determined to be unavailable by determining whether the GPS information received from GPS satellites is available, the same GPS phone and PTT tracked as being located in the same group and located at a short distance. The same PtoP communication is used to connect and call to a radio frequency link to obtain the necessary GPS information from the GPS phone of the same type.In this case, if it is determined that the GPS information received from another GPS phone is not available, In this case, the GPS information is acquired by the wireless base station.

Hereinafter, with reference to the accompanying drawings will be described in the present invention.

First, the present invention will be described with reference to FIG. 1, which is a diagram illustrating a system to which the present invention is applied as an example.

As shown in the drawing, the system to which the present invention is applied first defines a single area capable of short-range communication with each other according to a predetermined communication protocol, which is defined as the same group used in the present invention, and the GPS phones belonging to the same same group. (100, 110, 120) is set to use PtoP (Peer To Peer) communication, which enables sharing of radio frequency links with each other, such as push-to-talk (PTT), and adds GPS information transmitted from other GPS phones. According to the availability, it has a system structure for communicating with the wireless base station 130 to obtain necessary GPS information.

With such a structure, the system applied to the present invention belongs to the same group and can share a predetermined radio frequency link depending on whether a predetermined GPS phone 130 equipped with a GPS function can use GPS information stored therein. By calling the same type of GPS phone (100, 110) to obtain a series of GPS information, such as GPS satellite array information required for the initial setting from the called GPS phone.

More specifically, when the predetermined GPS phone 130 is determined to be unavailable by determining whether or not the GPS information received from the GPS satellites is available, homologous tracked as belonging to the same group and located at a short distance. The GPS phone 100 is connected to and called through a radio frequency link through a PtoP communication such as PTT to obtain the necessary GPS information from the GPS phone 100 of the same kind, at this time, the other GPS phone 100 obtained If it is determined that the GPS information received from the camera is not available as well, the wireless base station 130 obtains the necessary GPS information.

That is, when it is determined that the GPS information acquired from another GPS phone 100 of the same type is not available, the wireless base station 130 requests necessary GPS information and receives a predetermined GPS information packet following the preset transmission protocol. Extract the required GPS information from the received GPS information packet, and the availability of the above-described GPS information is performed according to a comparison result of a DOP (Dilution of Precision) value of the corresponding GPS information with a preset threshold value. It is preferable.

On the other hand, the GPS phone (100, 110, 120) for transmitting and receiving GPS information should be connected to each other via a predetermined radio frequency link that can be shared to enable PtoP communication, the present invention as an example to solve this problem PTT A push-to-talk scheme is adopted and described in more detail with reference to FIG. 2.

As shown in Figure 2, the present invention obtains the necessary GPS satellite array information from the GPS phone located in the shortest distance in the same group, specifically, the GPS phone 130, GPS information received from the GPS satellites In the case of determining whether the reliability is low and not available, it is determined that the application application is located at the shortest distance and calls the same type of GPS phone 100 that can be shared on the radio frequency link through a preset radio frequency. ), The GPS phone 100 of the same type located at the shortest distance transmits a predetermined response message including its location information in response to a call, so that a radio frequency link for PtoP communication is connected to each other. Through the radio frequency link, the GPS phone 130 can obtain necessary GPS satellite array information from other GPS phones. The above-described PTT is a PtoP between the GPS phones. It is merely an example for communication, and various modifications are possible without departing from the technical spirit of the present invention.

Next, the present invention will be described in more detail with reference to FIG. 3, which is an example of an internal block diagram of a GPS phone equipped with a PTT and a GPS function.

The GPS phone used in the present invention is required to use both a PTT function and a GPS function, and for this, as shown in FIG. 3, the user's voice signal is input through a microphone and the voice signal of the other party is output to the speaker. Demodulates the voice signal of the other party received through the telephone and the telephone call unit 300 for performing a telephone call to the telephone call unit 300 and outputs the voice signal of the user output from the telephone call unit 300. Modulating the modulator 310 to transmit the signal through the antenna, the GPS receiving module 320 to receive the position information signal transmitted by the GPS satellite through the antenna, and detecting and detecting the earth magnetic field. Geomagnetic field sensor module 330 for detecting the orientation of the terminal, temperature sensor module 340 for detecting the ambient temperature of the mobile communication terminal, and barometric pressure sensor for detecting the ambient air pressure of the mobile communication terminal Module 350, the map storage unit 360 for storing digital map data in advance, and the phone call unit 300 and the demodulator 310 to control the phone call, the GPS receiving module ( The position of the mobile communication terminal is determined by the position information signal received by 320, the direction is determined by the output signal of the geomagnetic sensor module 330, and the driving speed is measured by the temperature sensor module 340 and the barometric pressure sensor module. After the correction according to the temperature and atmospheric pressure detected by the 350 and matching to the digital map stored in the map storage unit 360 to control the central processing unit 370, and the control of the central processing unit 370 A display unit 380 for displaying a map matching the phone call state and the location and orientation of the mobile communication terminal, a command input unit 390 for inputting a command according to a user's operation to the central processing unit 370; Work of the central processing unit 370 And a memory 400 for temporarily storing the batter, it is preferred to so as to have a configuration composed of a same kind of phone and a GPS predetermined PTT transmission / reception unit 410 to the interface in the local area.

In the GPS phone of the present invention having such a configuration, the central processing unit 370 controls the telephone call unit 300 and the modulator 310 when the user commands the telephone call by operating the command input unit 390. The voice signal of the user is input through a microphone, processed by the telephone call unit 300, modulated by the modulator 310, and then transmitted through an antenna, and the voice signal of the other party received through the antenna is modulated and demodulated ( In step 310, the signal is demodulated, processed by the phone call unit 300, and then output to a speaker so that a user can make a phone call.

Meanwhile, when a predetermined navigation service operation is started according to the present invention, the CPU 370 detects the current position of the mobile communication terminal by receiving GPS location information received by the GPS receiving module 320.

That is, the GPS receiving module 320 receives GPS location information transmitted by at least three GPS satellites among a plurality of GPS satellites located in a geostationary orbit of the earth, and receives the GPS location information from the mobile communication terminal. By extracting the current position of the CPU 370 determines the current position of the mobile communication terminal by the output signal of the GPS receiving module 320.

At this time, the PTT transmitting / receiving unit 410 calls the same type of GPS phone belonging to the same group and sharing a predetermined radio frequency link under the control of the central processing unit 370. It receives a series of GPS information, such as GPS satellite array information required for the initial setting from the called GPS phone, thereby significantly reducing TTFF (Time To First Fix).

Specifically, when the central processing unit 370 determines whether the GPS location information received from the GPS satellites is available or not, the PTT transmitting / receiving unit 410 determines that the central processing unit 370 is not available. Under the control of), it connects and calls to the radio frequency link through the same type of GPS phone which is tracked to be located in the shortest distance in the same group and PtoP communication such as PTT and receives the necessary GPS information from the GPS device of the same type.

That is, if the DOP value of the GPS location information is less than the preset threshold, the central processing unit 370 determines that the reliability of the GPS location information received from the GPS satellites is low, and the PTT transmitter / receiver 410 determines the central processing unit ( 370 is located at the shortest distance and calls the same type of GPS phone that can be shared in the radio frequency link through a preset radio frequency to receive necessary GPS information from the called same GPS phone.

At this time, when it is determined that the GPS information received from another GPS phone is not available as well, or when there is no other GPS phone of the same kind that can share the radio frequency link within the setting radius, the central processing unit 370 ) To receive the necessary GPS information directly from the wireless base station.

That is, when it is determined that the GPS information obtained from another GPS phone of the same type is not available or when there is no other GPS phone of the same kind that can share the radio frequency link within the set radius, the central processing unit 370 modulates and demodulates. Requesting the GPS information required by the wireless base station through the device 310, receiving a predetermined GPS information packet following a preset transmission protocol, and extracting and obtaining necessary GPS information from the received GPS information packet. Likewise, it is preferable to use whether or not according to the result of comparing the DOP value of the corresponding GPS information with a preset threshold.

On the other hand, the GPS information packet transmitted from the wireless base station can be modified in various ways, Figure 4 is a view showing a preferred GPS information packet as an example, as shown, the frame control (Frame) in the MAC (Medium Access Control) frame The subtype of the control region is composed of 4 bits, and the frame body is composed of 2312 × 8, that is, 18,496 bits. In addition, the subtype defines a type indicating whether the location information request or response according to the present invention, and includes the location information request or response content in the frame body, the remaining packet configuration other than the sub type is the same as the general GPS information packet The detailed description thereof will be omitted here.

Next, the GPS information acquisition method of the GPS phone according to the present invention will be described with reference to FIGS.

When a GPS phone equipped with a GPS function is initially set from a GPS phone called by calling a similar GPS phone belonging to the same group and sharing a predetermined radio frequency link depending on whether the GPS information stored therein is available. Obtain a set of GPS information, such as the required GPS satellite array information.

That is, according to the driving of the GPS phone (S500), the GPS information received from the GPS satellites is loaded (S510) to determine whether it is available or not is determined to be unavailable (S520), the same according to the step (S550) Connect to the radio frequency link through the same type of GPS phone which is tracked as being located in the group and located at a short distance and PtoP communication such as PTT (S530) and call (S540) to obtain necessary GPS information from the GPS phone of the same kind. GPS phones that transmit / receive information should be connected to a predetermined radio frequency link that can be shared to enable PtoP communication. As an example to solve this problem, the present invention adopts a push-to-talk method. It is desirable to apply.

For example, to acquire the necessary GPS satellite array information from the GPS phone located at the shortest distance in the same group (S560, S570), specifically, the GPS phone determines whether the GPS information received from the GPS satellites is available or not. If it is determined that it is not possible to use it due to lack of reliability, it is located at the shortest distance as an application and calls the same type of GPS phone that can be shared on the radio frequency link through the preset radio frequency. In response to the call, the GPS phone transmits a predetermined response message including its location information to each other to establish a radio frequency link for PtoP communication. The array information can be obtained from another GPS phone (S560, S570).

On the other hand, if it is determined that the GPS information received from another acquired GPS phone is not usable as well, as shown in FIG. 6, the wireless base station acquires necessary GPS information.

That is, if it is determined that GPS information obtained from another GPS phone of the same type is not available or there is no other GPS phone of the same type that can share a radio frequency link within a setting radius, request the GPS information required from the wireless base station. (S600), receiving a predetermined GPS information packet according to a preset transmission protocol (S610), parsing necessary GPS information from the received GPS information packet (S620), and extracting necessary GPS protocol information (S630). If the GPS information packet is not received at S610, the default processing is performed according to whether the set time has elapsed (S640). Whether the above-mentioned GPS information is available or not is compared with the preset threshold of the corresponding GPS information. It is desirable to make it according to the result.

Finally, when the GPS information acquired from another GPS phone of the same type is determined to be usable in step S580, the present invention parses the protocol of the GPS information received from the GPS phone (S700), such as GPS satellite array information. After extracting the necessary GPS data (S710), the present invention is terminated by transferring it to a navigation engine inside the GPS phone.

As described in detail above, the GPS information acquisition method of the GPS phone according to the present invention, when initially unable to obtain the accurate position information of the satellite is received TTFF (Time To First Fix) by receiving from other GPS located at a short distance In addition to reducing the number of GPS information required for some reason, or if the reliability of the stored GPS information is not reliable, the desired GPS information can be obtained from other similarly located GPS phones in close proximity, enabling efficient GPS operation. There is.

Although the invention has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the spirit of the invention, and such modifications and variations belong to the appended claims.

Claims (7)

A first step of determining whether a predetermined mobile communication terminal equipped with a GPS function can use stored GPS information; A second step of calling another mobile communication terminal equipped with a shareable GPS function of a predetermined radio frequency link within a set radius according to the determination result of the first step; And a third process of acquiring necessary GPS information from another mobile communication terminal equipped with the GPS function called in the second process. The method of claim 1, wherein the second process comprises: If it is determined that the stored GPS information is not available, the first step of calling the other mobile communication terminal having the same GPS function capable of sharing a predetermined radio frequency link within a set radius is determined. GPS information acquisition method of a predetermined mobile communication terminal equipped with a GPS function, characterized in that consisting of two processes. The method of claim 1, wherein the first process comprises; And comparing the DOP value of the corresponding GPS information with a preset threshold value and determining whether the GPS information is available according to the comparison result. The method of claim 1, further comprising: after a third procedure; A fourth step of determining whether to use the GPS information acquired in the second step; And And a fifth process of acquiring GPS information required by the wireless base station according to the determination result of the fourth process. The method of claim 4, wherein the fifth process comprises; In step 4-1, if it is determined in step 4 that the GPS information is not available, requesting GPS information required by the wireless base station to receive a predetermined GPS information packet following a preset transmission protocol; Step 5-2 of extracting and obtaining the necessary GPS information from the GPS information packet received in step 5-1, GPS information acquisition method of a predetermined mobile communication terminal with a GPS function. The method of claim 4, wherein the fourth process comprises; And comparing the DOP value of the corresponding GPS information with a preset threshold value and determining whether the GPS information is available according to the comparison result. 7. The system of any one of claims 1 to 6, wherein the radio frequency link comprises; GPS information acquisition method of a predetermined mobile communication terminal equipped with a GPS, characterized in that the radio frequency link for Push To Talk (PTT).

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