KR20010094595A - Location Detecting Apparatus and Method for Mobile Terminal - Google Patents

Abstract

PURPOSE: An apparatus and method for recognizing the location of a mobile terminal is provided to clearly receive beacon signals from a plurality of base stations within the coverage of a mobile station at an arbitrary location by controlling the sending of their beacon signals in order to prevent the mutual interference between the signals. CONSTITUTION: An apparatus for recognizing the location of a mobile terminal is comprised of an operation variable setup part(310), a sync signal generation part(320), a pilot signal generation part(330), a signal modulation part(340), a frequency up-converting part(350), an RF amplification part(360), an output control part(370), and a signal sending part(380). The operation variable setup part(310) stores and manages the location information of a base station and the control variable information of an output signal. The sync signal generation part(320) generates a sync signal and a reference frequency signal. The pilot signal generation part(330) generates a carrier wave signal, based on the sync signal and the reference frequency signal. The signal modulation part(340) combines and modulates the carrier wave signal generated by the pilot signal generation part(330) and the location information supplied from the operation variable setup part(310). The frequency up-converting part(350) upconverts the frequency of the modulated signal to an RF band. The RF amplification part(360) amplifies the level of the output signal of the frequency up-converting part(350). The output control part(370) controls the output of the RF amplification part(360), based on the sync signal supplied from the sync signal generation part(320). The signal sending part(380) sends the signal outputted from the RF amplification part(360) to the air.

Description

Device and method for location recognition of mobile terminal {Location Detecting Apparatus and Method for Mobile Terminal}

The present invention relates to an apparatus and method for location recognition of a mobile terminal, and more particularly, by generating and transmitting a CDMA location recognition beacon signal from a base station of a code division multiple access (CDMA) system, The present invention relates to a device and a method for recognizing a location of a mobile terminal, which enables a mobile terminal to obtain its location information in real time.

As a conventional conventional technique for detecting the position of a moving object, a technique for obtaining its own position by analyzing a satellite signal by a low orbit satellite and a technique for searching and obtaining the position of the moving object in a terrestrial base station of a wireless communication system have been proposed. .

Of the electronics that is, position detection technology by the low orbit satellite, a plurality of general-purpose global positioning system, as shown in Figure 1 (Global Positioning System: GPS) receives a satellite signal from a satellite to be emitted (11 ₁ -11 _n) After the device 12 receives it. Those contained in the received signal of each GPS (11 ₁ -11 _n) using the deviation of the location information and the reception time between the signal to be obtained to calculate the position of their 12, the initial synchronization time set in the urban environment ( In addition to the high locking time, the signal transmission by the building and / or the signal reception sensitivity in the building is very weak, thereby causing the location recognition to be inaccurate.

In addition, each of the base stations the signals sent out from, as the latter technique is illustrated in Figure 2, the mobile terminal 21 from the plurality of base stations (22 ₁ -22 _n), and then, the location estimating apparatus 23 is received by the The position is calculated by triangulation based on the positional information of (22 ₁ -22 _n ) and the reception time deviation between the received signals, and the calculation result is provided to the mobile terminal 21. According to the relative distance difference between the mobile terminal and each of the base stations, some base stations located at a relatively long distance from the mobile terminal receive a signal that is necessary for triangulation because the reception sensitivity of the mobile terminal is very weak. In order to compensate for this, it is possible to increase the strength of the transmission power of the corresponding terminal. Terminals around the station, again, not only do not recognize the signal from the remote base station relatively, but also has a problem in that it is impossible to increase or decrease the output of the terminal exponentially in reality.

The present invention has been made to solve the above problems, and its purpose is to generate a CDMA location recognition beacon signal from a base station of a code division multiple access (CDMA) system to be periodically transmitted, but adjacent to each other By transmitting and controlling to prevent mutual interference between each beacon signal transmitted from the base station of the mobile station of the mobile terminal, it is possible to clearly receive each beacon signal of a plurality of base stations in the signal reachable range of the mobile terminal of any position, It is an object of the present invention to provide an apparatus and method for location recognition.

1 and 2 are views for explaining a conventional position recognition method,

3 is a block diagram of an apparatus for location recognition of a mobile terminal according to an embodiment of the present invention;

4 is a flowchart of a method for location recognition of a mobile terminal according to an embodiment of the present invention;

5 is a generation diagram of a staggered beacon signal by the apparatus and method for location recognition of a mobile terminal according to the present invention;

FIG. 6 is a diagram illustrating a signal acquisition of a reception finger according to time and reception time difference of a beacon signal according to time when a beacon signal of each base station is received in a mobile terminal according to the present invention.

※ Explanation of code for main part of drawing

11 ₁ -11 _n : universal earth positioning system 12: satellite receiver

21: mobile terminal 22 ₁ -22 _n : receiver station

23: positioning device

310: operating variable setting unit 320: synchronization signal generator

330: pilot signal generator 340: signal modulator

350: frequency upward adjustment unit 360: high frequency amplifier

370: output controller 380: signal transmitter

In order to achieve the above object, an apparatus for recognizing a location of a mobile terminal according to the present invention, in a CDMA system, sets operating variables for storing and managing location information of a corresponding base station and control variable information of an output signal set from the outside. Way; Synchronizing signal generating means for generating a synchronizing signal and a reference frequency signal; Carrier signal generation means for generating a carrier signal on the basis of the synchronization signal and the reference frequency signal generated from the synchronization signal generation means; Signal modulation means for combining and modulating the position information provided from the operating variable setting means with the generated carrier signal; Frequency upward adjustment means for upwardly adjusting and outputting the frequency of the signal modulated by the signal modulation means; Amplifying means for amplifying the output signal level of the frequency uplink adjusting means; Intermittent the output of the amplifying means based on the synchronizing signal provided from the synchronizing signal generating means, and intermittent on the basis of the control variable information provided from the operating variable setting means. Output control means for controlling characteristics of the output signal; And signal transmitting means for transmitting the signal output from the amplifying means in the air.

In order to achieve the above object, a method for recognizing a location of a mobile terminal according to the present invention includes a location information of a corresponding base station from each of adjacent base stations in a predetermined area in a communication method using a CDMA method. A first step of periodically generating and transmitting the corresponding beacon signals, and sequentially generating the plurality of beacon signals output from the plurality of base stations; Receiving a beacon signal generated from each of the base stations; A third step of extracting and obtaining location information of a corresponding base station included in each of the received beacon signals; A fourth step of measuring a reception time difference between each of the received beacon signals; And a fifth step of calculating a position of the receiving moving body based on the obtained position information and the measured time difference information.

Hereinafter, an apparatus and method for location recognition of a mobile terminal according to an exemplary embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of an apparatus for recognizing a location of a mobile terminal according to an embodiment of the present invention. The operating variable setting unit 310 stores and manages location information of a corresponding base station and control variable information of an output signal set from the outside. ); A synchronization signal generator 320 generating a synchronization signal and a reference frequency signal; A pilot signal generator 330 for generating a carrier signal based on the synchronization signal and the reference frequency signal generated from the synchronization signal generation means; A signal modulator 340 for combining and modulating the carrier signal generated by the pilot signal generator 330 and the position information provided from the operating variable setting unit 310; A frequency up-adjustment unit 350 for adjusting the frequency of the signal modulated by the signal modulator 340 upwardly and outputting the high frequency band; A high frequency (RF) amplifier 360 for amplifying the output signal level of the frequency upward adjuster 350; On the basis of the synchronization signal provided from the synchronization signal generator 320, the output of the high frequency amplification unit 360 is interrupted, and at the time of interruption, it is provided from the operating variable setting unit 310. An output control unit 370 for controlling characteristics of the output signal to be intermitted based on the control variable information; And a signal transmitter 380 for air transmission of the signal output from the high frequency amplifier 360.

The operating variable setting unit 310 stores and manages the position information of the base station where the apparatus of the present invention is installed and the control variable information of an output signal set from the outside, and the control variable information is the last stage of the apparatus of the present invention. The output sequence information of the high frequency beacon signal, which is output from the high frequency amplifying unit 360 and is to be air-transmitted through the signal transmitting unit 380, output increase / decrease slope information, output duration information, and the like.

The sync signal generator 320 receives a precise signal such as GPS satellite data and generates a sync signal such as 1 pps (pulse per second) or ESP (even second pulse) to the base station and the apparatus of the present invention. A reference frequency such as 10 MHz or 19.6608 MHz is generated to provide signals necessary for the pilot signal generator 330 and the output controller 370.

The pilot signal generator 330 generates a beacon signal mediated signal (ie, a carrier signal) based on the sync pulse signal and the reference frequency signal provided from the sync signal generator 320. However, the generated carrier signal is output with a predetermined offset value by a preset pseudo noise offset provided from the operating variable setting unit 310 and provided to the signal modulator 340. This offset value is for functioning as a mutual identifier between multipath signals (beacon output signals respectively output from a plurality of mutually adjacent base stations).

The signal modulator 340 modulates and outputs the position information signal provided from the operation variable setting unit 310 to the signal provided from the pilot signal generator 330 to output a beacon including the position information of the corresponding base station. To make a signal.

The frequency upward adjuster 350 adjusts and outputs a 10 MHz baseband beacon signal provided from the signal modulator 340 to a high frequency band beacon signal such as an 800 MHz band, and the high frequency amplifier 360 The power level of the high frequency beacon signal output from the frequency uplink adjusting unit 350 is amplified and output, and the signal transmitting unit 380 is for transmitting the signal output from the high frequency amplifier 360.

In particular, the high frequency amplifying unit 360 controls the output according to the control of the output control unit 370, and also controls the slope and output duration of the increase and decrease, such as the output control unit 370 ) Receives the sync pulse signal from the sync signal generator 320, intermittently controls the output of the high frequency amplifier 360 based on the provided sync signal, and controls the operation variable during the intermittent control. By receiving the output sequence number information, the output increase and decrease slope information, and the output duration information from the setting unit 310, by converting the provided information into an electrical control signal applied to the high frequency amplifier 360, Signals intermittently output from the high frequency amplifier 360 are output as unit output pulses with a constant period T as shown in FIG. 5, and output signals for each base station (# 1, # 2, .., # n) are mutuallyThe magnitudes of the outputs are alternately outputted, and the unit output signals are sequentially outputted so that the pulses have rising and falling slopes.

That is, as shown in FIG. 5, the unit output signals respectively output from the plurality of neighboring base stations # 1, # 2, ..., #n in the predetermined predetermined area are sequentially staggered by the output sequence number information. And the rising and falling speeds of the unit output signal are controlled by the output increase and decrease slope information. An up slope and a down slope are formed in the unit output signal, and the ascending peak is maintained at a stable level for a predetermined time by the output duration information.

FIG. 4 is a flowchart illustrating a method for recognizing a location of a mobile terminal according to an embodiment of the present invention. Since the present invention is applied to the apparatus according to the present invention of FIG. 3, it will be described with reference to FIG. 3.

First, using the apparatus of FIG. 3, as shown in the beacon signal generation diagram of FIG. 5, the position of the base station from each of adjacent base stations # 1, # 2,... A unit beacon signal including information (a pulse signal having a rising and falling slope) is periodically generated and transmitted, and the unit beacon signals output from the plurality of base stations are alternately generated to sequentially generate each other. According to the control operation of the output control unit 370 based on the output generation sequence information of the operating variable setting unit 310 of 3 and the synchronization signal of the synchronization signal generator 320 (S501).

That is, step S501 is a process of generating a periodic beacon signal from a plurality of terrestrial base station so that the receiving mobile terminal can freely receive it when necessary, and the beacon signal is an operating frequency separate from the talk channel frequency of the CDMA base station. Preference is given to using.

Next, the mobile terminal tunes the frequency with respect to the periodic staggered beacon signal generated from each base station in step S501 and quickly compensates the strength of the received radio wave through an automatic gain control function (S502). .

Subsequently, in the received staggered beacon signal (unit pulse signal), as shown in FIG. 5, the beacon signal is applied to the corresponding beacon signal by using a signal-to-noise ratio (Ec / Io) during a stable level duration level without change. Extract location information of the included base station (S503). In this case, the stable sustain level is determined by the output duration information of the operating variable setting unit 310 of FIG. 3, while the beacon signal is generated and sent from one specific base station, and the stable level is maintained. Since the beacon signals of the respective base stations are sequentially generated alternately as in step S502, the beacon signals of other neighboring base stations are turned off. Therefore, the mobile terminal as the receiving mobile station can clearly receive only one beacon signal so as to obtain a good signal-to-noise ratio of the CDMA method at all times without being interfered with other beacon signals regardless of its position.

Then, the reception time difference between the beacon signals of each base station is measured. When a beacon signal of any base station is received after a stable level duration of the received beacon signal, a finger of the receiving mobile terminal suddenly changes its tuning position or causes another finger to tune to a new signal. This is a phenomenon that is generated according to the overlap degree due to the rising and falling slope between the unit beacon signals or according to the tracking speed of the receiving finger, the output increase and decrease slope information of the operating variable setting unit 310 of FIG. And / or the operation of the finger is different depending on the setting of the operation control variable, such as output duration information. Through the operation of the receiving finger as described above, that is, as shown in FIG. 6, the base station measures the difference in the reception time at which the beacon signals of the base stations are captured by the receiving finger, and based on the measured difference in the reception time, The reception time difference between the beacon signals output from the reception mobile terminal can be known (S504).

Finally, the location of the receiving mobile terminal is calculated by triangulation based on the location information of each base station obtained in step S503 and the reception time difference of each base station measured in step S504 (S505).

As described in detail above, according to the apparatus and method for location recognition of a mobile terminal according to the present invention, by generating a beacon signal for location recognition of the CDMA scheme that is sequentially intersected from a plurality of base stations, and receiving the beacon signal By allowing the mobile terminal to calculate and recognize its own location by triangulation, it eliminates the mutual interference between beacon signals generated from each base station, so that the location information signal of the strong electric field and the precise location information can be obtained even in a complex radio wave disturbance environment such as downtown. The signal source may be provided by the mobile terminal, and the mobile terminal may acquire its corresponding location information in real time without causing a load on the system at the required time. In addition, when the mobile terminal is a CDMA method, it is possible to recognize its own location information by receiving beacon signals from each base station not interfering with each other by only simple software changes without adding additional hardware.

Claims (9)

In a code division multiple access communication system, Operating variable setting means for storing and managing position information of the base station and control variable information for an output signal set from the outside; Synchronizing signal generating means for generating a synchronizing signal and a reference frequency signal; Carrier signal generation means for generating a carrier signal on the basis of the synchronization signal and the reference frequency signal generated from the synchronization signal generation means; Signal modulation means for combining and modulating the position information provided from the operating variable setting means with the generated carrier signal; Frequency upward adjustment means for upwardly adjusting and outputting the frequency of the signal modulated by the signal modulation means; Amplifying means for amplifying the output signal level of the frequency uplink adjusting means; Intermittent the output of the amplifying means based on the synchronizing signal provided from the synchronizing signal generating means, and intermittent on the basis of the control variable information provided from the operating variable setting means. Output control means for controlling characteristics of the output signal; And Apparatus for position recognition of the mobile terminal, characterized in that it comprises a signal transmitting means for transmitting the signal output from the amplifying means in the air. The method of claim 1, And the control variable information of the operating variable setting means comprises output generation sequence number information, output increment gradient information, and output duration information. The method of claim 2, The output control means causes the unit output signals respectively outputted from the plurality of adjacent base stations within a predetermined region to be sequentially generated based on the output occurrence sequence information, and the unit output signals by the output increase / decrease slope information. And a rising speed and a falling speed of the control unit, and controlling the rising peak of the unit output signal to be maintained at a stable level for a predetermined time by the output duration information. The method of claim 1, And the synchronizing signal generating means generates the synchronizing signal and the reference frequency signal on the basis of satellite data output from a universal earth positioning system (GPS). The method of claim 1, And said carrier signal generating means generates a carrier signal having a constant offset value according to a pseudo noise offset provided from said operating variable setting means. In a communication method in a code division multiple access system, The beacon signals including the location information of the base station are periodically generated and transmitted from a plurality of base stations adjacent to each other within a predetermined region, and the plurality of beacon signals output from the plurality of base stations are sequentially A first step of generating; Receiving a beacon signal generated from each of the base stations; A third step of extracting and obtaining location information of a corresponding base station included in each of the received beacon signals; A fourth step of measuring a reception time difference between each of the received beacon signals; And And a fifth step of calculating the position of the moving body based on the obtained position information and the measured time difference information. The method of claim 6, In the first step, the beacon signal is generated in the form of a pulse having an up slope (down slope) and a down slope (down slop). The method of claim 6, In the first step, each beacon signal has a different offset value different from each other, characterized in that for the mobile terminal. The method of claim 6, In the fourth step, a reception time difference between the beacon signals is a beacon signal and a mobile terminal, each of which is a code division multiple access method and a beacon signal transmitted from the base station. And measuring based on the time captured by the finger.