KR20030081203A - A Jamming Methods for WCDMA - Google Patents

Abstract

PURPOSE: A jamming method for an asynchronous mobile communication system is provided to generate a jamming radio wave for preventing the communication of a UE(User Equipment) and a node B when the UE moves to a specific area set in an area covered by the node B. CONSTITUTION: A jamming code generator(420) generates a primary pilot signal by a primary scramble code which is different from a primary scramble code of a node B. The jamming code generator(420) generates a PSC(Primary Synchronization Code) signal for slot synchronization. The jamming code generator(420) generates an SSC(Secondary Synchronization Code) signal for discriminating a frame synchronization and a code group. The jamming code generator(420) synthesizes the primary pilot signal, the PSC signal and the SSC signal, and generates a baseband signal. A WCDMA(Wideband Code Division Multiple Access) IF(Intermediate Frequency) and RF(Radio Frequency) signal processing unit(430) modulates the baseband signal to covert the baseband signal into an RF signal, amplifies the converted RF signal at a desired level, and transmits the amplified RF signal to a jamming specific area.

Description

A Jamming Methods for WCDMA

The present invention relates to a disturbance method of a mobile communication asynchronous system, and more particularly, to a disturbance method that prevents communication with a base station when a mobile terminal moves to a specific area within an area covered by the base station.

Mobile communication systems have evolved into first generation analog cellular, second generation digital cellular, 2.5 generation PCS, and third generation IMT-2000. Currently, up to 2.5 generations have been commercialized and services are in operation, but the third generation of IMT-2000 is being piloted.

The third generation mobile communication system (IMT2000), which is currently under development, adopts two standards: asynchronous system method led by 3GPP (3rd Generation Partnership Project) and synchronous system method led by 3GPP2. The asynchronous system method is WCDMA developed mainly in Japan and Europe, based on DS-CDMA technology, and the synchronous system method is cdma2000 1x (IS2000) method developed in North America.

The biggest difference between the asynchronous system method and the synchronous system method is the difference in time synchronization between base stations.

In the synchronous method, all base stations operate with the same time synchronization using GPS, but in the asynchronous method, all base stations operate with different time differences. That is, the synchronous method aligns the base station time evolved based on the IS-95 to a common absolute time reference to allow the mobile station to easily acquire the system time and handoff, but the base station should be provided with the reference time from the GPS.

Since the frame time of all the base stations is independent, the reference time is not necessary, so that various types of base stations can be easily installed. However, the mobile station requires a lot of time to perform an initial cell search.

On the other hand, if base stations are installed between countries or in certain areas such as cease-fire lines, they may block the signals of neighboring or neighboring countries, or interfere with radio waves to prevent them from properly receiving their signals from neighboring or neighboring countries. There is a need. In the synchronous mobile communication system, an orthogonal call noise simulator having such a function is disclosed in Korean Patent Application Publication No. 2001-0098126, but it has not been developed yet in an asynchronous system.

An object of the present invention is a third generation for generating a disturbing radio wave to prevent communication with the base station when the mobile terminal moves to a specific area set within the area covered by the base station of the asynchronous mobile communication system in order to meet the necessity as described above. The present invention provides a method for disturbing a mobile communication asynchronous system.

1 is a view for explaining the concept of disturbance according to the present invention,

2 is a flowchart of a synchronous procedure in a third generation asynchronous mobile communication system to which the present invention is applied;

3 is an example of a channel structure applied to a synchronization procedure according to the present invention;

4 is a block diagram illustrating a disturbance device according to the present invention;

5 is a block diagram illustrating the configuration of the asynchronous base station disturbance code generator shown in FIG. 4;

FIG. 6 is a block diagram illustrating a clock and a common unit illustrated in FIG. 4;

FIG. 7 is a timing diagram showing a clock of the clock generator shown in FIG. 6;

8 is an example of a downlink scramble code generator applied to the present invention.

9 is a configuration diagram of a test system for measuring disturbance signal strength.

* Explanation of symbols for main parts of the drawings

10: WCDMA disturbance station 12: disturbance zone

20: WCDMA base station 22: calling area

30: boundary line 410: controller

420: asynchronous base station disturbance code generator 430: WCDMA IF and RF signal processing device

421: clock and common section 422: main pilot channel code generator

423: primary sync channel code generator 424: secondary sync channel code generator

425-1 to 425-3: Multiplier 426: Summer

427: real part 428: imaginary part

610: oscillator 620: PLL

630: clock generator 810: X-LSFR

820: Y-LSFR

In order to achieve the above object, the method of the present invention is an asynchronous mobile communication system in which a WCDMA base station transmits an assigned main scramble code to enable terminals within a corresponding cell coverage to communicate with the main scramble code of the base station. Generating a main pilot signal by the main scramble code, generating a main synchronization signal (PSC) signal for slot synchronization, generating a floating signal (SSC) signal for identifying a frame synchronization and a code group; Generating a baseband signal by synthesizing the main pilot signal, the main synchronous signal, and the floating signal; and modulating the baseband signal to convert it into an RF signal, and amplifying the converted RF signal to a desired level to disturb it. Characterized in that the step of sending to a specific area.

In the present invention, the baseband signal processes the synthesized signal and outputs a real (BB_I) signal and an imaginary (BB_Q) signal orthogonal to each other.

In the present invention, the transmitting step includes the step of up-converting the baseband signal to at least one frequency band for each operator to generate a high frequency signal, synthesizing the upconverted high frequency signals, linear power amplification of the synthesized signal And passing only a signal of a predetermined band among the power amplified signals and transmitting the same through an antenna.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the concept of a disturbance method according to the present invention, a WCDA base station 20 for outputting a normal signal for a call in an asynchronous manner, and jamming so that terminals in a specific region do not receive the base station signal (Jamming) WCDMA disturbing station 10 for outputting a signal is shown.

As shown in FIG. 1, when the cell coverage of the base station 20 extends beyond the boundary 30 to other countries (or other regions) to form the call zone 22, the other countries (or other regions) ) Transmits a disturbance signal from the disturbing station 10 to the corresponding region so as not to receive a signal of the own station. Accordingly, the jamming zone 12 is intentionally formed by the disturbing station 10 within the cell coverage of the base station 20, and the terminals in the jamming zone 12 transmit the disturbing radio waves emitted from the disturbing station 10 to the base station radio waves. Since it is mistaken, the signal of the actual base station 20 cannot be received. Here, the antenna of the disturbing station 10 is configured as a directional or directional antenna in consideration of the arrangement interval with the base station 20, the disturbance direction.

2 is a flowchart illustrating a synchronous procedure in a third generation mobile communication asynchronous system to which the present invention is applied.

According to the 3GPP TS 25.214 standard that specifies the procedure of the physical layer of the FDD scheme in the asynchronous system, the terminal is scrambling obtained after performing a cell search (S1) as shown in FIG. 2 as a synchronization procedure of the physical layer. Receives a primary common control physical channel (P-CCPCH) using a code (S2), and operates by obtaining base station information through a broadcast channel (BCH: Broadcast channel) of the corresponding base station (S3).

The base station discovery process (S1) is a process of searching for a base station that the terminal of the asynchronous system can receive the service in the initial stage, the slot synchronization (Slot synchronization) step (S11) and the frame (frame) and code group identification step (S12), A scramble code identification step S13 is made.

All terminals must select a base station that can be serviced from neighboring base stations and perform a cell search process that performs synchronization with the base station, but can receive service from the base station. Therefore, in order to prevent the terminal from properly performing the base station discovery process, the disturbing station 10 generates a code not used in the corresponding base station 20 cell and transmits it to the terminal.

Meanwhile, in an asynchronous mobile communication system, a forward (downlink) scrambling code is used to distinguish a base station from a base station, and a reverse (uplink) scrambling code is used to distinguish a terminal from a terminal. Orthogonal code (OVSF) is used to distinguish, and orthogonal code (OVSF) is used to distinguish the channel transmitted from the terminal.

There are 8192 scrambling codes used on the forward link (downlink) in an asynchronous system. Scrambling code is a kind of pseudo random code. The 8192 codes are divided into 512 code sets, and each of the 512 code sets includes one main scrambling code and 15 subscrambling codes.

Therefore, there are 512 main scrambling codes and 512 main scrambling codes are divided into 16 code groups. Each of the 16 code groups consists of 8 main scrambling codes.

The primary common pilot channel (P-CPICH) always uses the primary scrambling code, and each base station distributes 512 primary scrambling codes.

Referring to FIG. 2, in the base station discovery process S1, the terminal selects the best cell (base station) to determine the forward link (downlink) scrambling code and frame synchronization of the cell.

To this end, in the first step of slot synchronization (S11), the terminal searches for a primary synchronization code (PSC) of the primary synchronization channel (P-SCH) of the base station and synchronizes the slot with respect to the cell received at the highest power. Acquire. This process can be implemented using a matched filter.

In the frame synchronization and code group identification step (S12), the terminal searches the secondary synchronization code (SSC) of the sub-synchronization channel (S-SCH) of the base station to identify the frame synchronization and the scramble code group used by the current base station. do. The CP (Cyclically Permutable) code used as the SSC has a unique property of cyclic shifts, so that frame synchronization and a group of codes can be simultaneously determined.

In the scrambling code identification step (S13), the terminal searches for the main common pilot channel (P-CPICH) and performs correlation with all the scrambling codes belonging to the code group identified in step S12 to identify the main scrambling code of the corresponding cell. . That is, the scrambling code is identified through correlation between all scrambling codes belonging to the code group and symbols of the main common pilot channel (P-CPICH).

When the scrambling code is confirmed, the primary common control physical channel (P-CCPCH) can be detected, and broadcast control data (BCH) can be received.

3 is a timing diagram of channels applied to a synchronization procedure according to the present invention.

Referring to FIG. 3, one frame is composed of 38,400 chips as 10 ms, and is divided into 15 slots from slot 0 to slot 14. One slot consists of 0.667ms, 2560 chips, and is divided into 10 symbols. One symbol consists of 66.7㎲, 256 chips. The main sync channel (P-SCH) outputs the same main sync code (PSC) in all cells at the first symbol of each slot start of one frame. In step S11 of the base station search, slot sync is performed by the main sync code (PSC). To establish.

In the first symbol of every slot of one frame, the sub-sync channel (S-SCH) sends out different floating code codes (SSC ⁰ to SSC ¹⁴ ) for each slot in every cell.In the step S12 of the base station search, this floating code (SSC ^{0) is used.} ~ SSC ¹⁴ ) confirms the frame sync and code group.

In the common common pilot channel (P-CPICH), a pilot signal (Common Pilot) is continuously transmitted to check the scrambling code, and in the base station discovery step (S1), the pilot signal is received and belongs to all code groups identified in step S12. By correlating the scrambling code, the primary scrambling code of the cell is identified. Here, the pilot signal of the main common pilot channel (P-CPICH) is generated by multiplying a scrambling code by information (A = 1 + j) of a predetermined format.

As described above, the terminal of the asynchronous mobile communication system can transmit and receive information only after synchronization is obtained through the channel search process of the base station. Therefore, if synchronization acquisition fails, communication with the base station is not possible.

4 is a block diagram illustrating a disturbance device according to the present invention, which includes a controller 410, an asynchronous base station disturbance code generator 420, a WCDMA IF and RF signal processor 430, and a rechargeable battery. It is composed of a power supply unit 440.

The controller 410 includes a microprocessor 410-1, a memory 410-2, a display unit 410-3, and a key input unit 410-4. The microprocessor 410-1 is connected to an external personal computer (PC) through a port such as a serial port, for example, RS232 or RS422, and includes an Ethernet port. The memory 410-2 includes a sync DRAM, a flash memory, an EEPROM, and the like. The display unit 410-3 includes a character display for displaying characters, such as a VFD or LCD, and a light emitting diode for displaying an operation state. The key input unit 410-4 includes an up / down key, a set key, and the like for mode setting and command or information input.

The disturbing code generator 420 includes a code generator 420-1 and a transmission signal processor 420-2. Referring to FIG. 5, the code generator 420-1 includes a clock and a common unit 421, a main common pilot channel code generator (P-CPICH) 422, and a main synchronous channel code generator (P-SCH). 423, a floating channel code generator (S-SCH) 424, multipliers 425-1 to 425-3, and a summator 426, and a transmission signal processor 420-2 includes The real part Re (.) 427 and the imaginary part Im (.) 428 are included. The output of the disturbance code generator 420 is a baseband signal, which is transmitted to the IF and RF signal processor 430 in order to convert the signal into an RF signal of WCDMA.

The WCDMA IF and RF signal processor 430 includes upconverters 430-1 and 430-2, combiners 430-3, linear power amplifiers 430-3, and band pass filters 430-5 for each operator. ).

The upconverter units 430-1 and 430-2 for each operator convert the baseband signal inputted from the asynchronous base station disturbance code generator 420 into an IF signal of 19.2 MHz by QPSK modulation, and again, for each operator using a mixer. Convert to RF signal according to FA frequency band (UP CONVERSION). The RF signal has a frequency band allocated to each operator in an FDD frequency band, for example, 2130-2170 MHz.

The combiner 430-3 synthesizes the RF signals for each operator.

The linear power amplifier 430-4 linearly power amplifies the synthesized RF signal.

The band pass filter 430-5 filters only signals in the FDD frequency band and connects the antenna to the antenna.

The controller 410 controls the asynchronous base station disturbance code generator 420 and the WCDMA IF and RF signal processor 430 and monitors the state. That is, the controller 410 monitors and controls the system such as the disturbance code generator 420 and the state of the WCDMA IF and the RF signal processor 430.

Controller 401 is PN output level, PN number state, SCH on / off state, RF gain value, the output level and threshold setting of the linear power amplifier, temperature measurement of the linear power amplifier, on / off state of the linear power amplifier, power supply Monitor battery voltage status.

The controller 410 is configured for the disturbance PN number of the 512 PN numbers, SCH on / off control, output signal on / off control, RF signal attenuation rate control, PLL hopping frequency and time interval control, on / off control of the linear power amplifier Controls the back.

The controller 410 generates an alarm when a failure occurs as a result of the monitoring of each part of the system and displays a letter on the display or a warning through the LED, stores the reason for the failure in the memory, and remotely notifies the centralized control unit.

FIG. 5 is a block diagram illustrating the configuration of the asynchronous base station disturbance code generator shown in FIG. 4.

The disturbing code generator 420 generates P-CPISH, P-SCH, and S-SCH channel signals conforming to the 3GPP standard. The signals of each generated channel are multiplied by the corresponding gains G _cp , G _psc , and G _ssc controlled by the controller 410, and the results are summed. The sum result is divided into a real part 427 and an imaginary part 428 so that the real part 427 generates the BB_I signal and the imaginary part 428 generates the BB_Q signal. The generated BB_I and BB_Q are baseband signals and are transmitted to the IF and RF signal processor 430 for QPSK modulation.

Referring to FIG. 5, the primary common pilot channel code generation unit (P-CPICH) 422 generates a pilot signal of a primary common pilot channel (P-CPICH) conforming to the 3GPP standard. The pilot signal is multiplied by the main scrambling code of the other gold code series by the code of the base station to be disturbed and the constant information (A = 1 + j) in order to transmit without transmitting diversity using one antenna. It is generated to match the frame, 10ms.

A DL-scrambling code is used for the P-CPISH 422, which generates an X linear shift feedback register (X-LSFR) and a Y linear shift feedback register as shown in FIG. (Y-LSFR: 820). The X-LSFR 810 and Y-LSFR 820 are initialized every 10 ms, and the initial value of the Y-LSFR 820 is always constant. That is, y (i), y (0) = y (1) = y (2) = ... y (17) = 1, and x (i) is the microprocessor 410 according to the scramble code number used. -1) or from memory 410-2.

In this case, there are 262,143 DL scramble codes that are used to distinguish several base stations from each other in an asynchronous system. As described above, only about 8192 DL scramble codes are used. Of the 8192 scrambled codes, 512 codes used in the P-CPICH unit 422 are referred to as main scramble codes. When the total number of scramble codes used is from 0 to 8191, the main scramble code numbers are 0,16,32, ..., 8176 (= 16 * k, k = 0 to 511).

In order to disable the asynchronous terminal in the present invention, a code different from the main scramble code of the cell currently being used is used. If the same scrambling code is used, the terminal recognizes it as a multipath and attempts to combine Daviesti, but since the valid data is not input to this path, it does not affect the terminal.

According to the main scramble code to be used, the 512 types of initial values are stored or generated for initializing the X-LSFR 810. In the present invention, 512 kinds of initial values are stored in the memory 410-2. The X-LSFR 810 is initialized every 10 ms with reference to the scrambling code number received from the controller 410.

The main synchronization channel code generation unit (P-SCH) 423 generates a main synchronization code (PSC) conforming to 3GPP. The main synchronous code is shown in Equation 1 below.

In Equation 1, a = <x ₁ , ..., x ₁₆ >

= <1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1>.

The main synchronization code (PSC) is generated for the first 256 chips of 15 slots with the same code for 10 ms. Thus, the main synchronization code (PSC) is used to identify the slot boundary, that is, the slot phase.

The floating channel code generation unit (S-SCH) 424 generates a floating code (SSC) conforming to 3GPP. The floating code (SSC) is generated by two ROM tables in memory, one is a Hadamard table and the other is an SSC allocation table defined in Table 4 of TS25.213 of the 3GPP specification.

In Equation 2, b = <x ₁ , x ₂ , x ₃ , x ₄ , x ₅ , x ₆ , x ₇ , x ₈ , -x ₉ , -x ₁₀ , -x ₁₁ , -x ₁₂ , -x ₁₃ , -x ₁₄ , -x ₁₅ , -x ₁₆ >, <x ₁ , ..., x ₁₆ > = <1, 1, 1, 1, 1, 1, -1, -1, 1, -1 , 1, -1, 1, -1, -1, 1>.

Where m = 16 × (k−1) and a Hadamard matrix Is the i th element of the m th column of H ₈ .

The floating code (SSC) is generated sequentially with the first 256 chips of 15 slots with different codes for 10ms. Thus, the floating code SSC is used to identify the frame boundary, i.e., the frame phase.

The clock and common unit 421 generates and supplies necessary information and timing signals, such as a master scrambling code number. The timing signal is composed of signals such as an address and a clock for reading the memory of each part.

The first multiplier 425-1 multiplies the output signal of the P-CPICH 422 by the gain G _cp , and the second multiplier 425-2 generates the main synchronous channel code. The output signal of the negative (P-SCH) 423 is multiplied by the gain G _psc , and the third multiplier 425-3 outputs the gain G to the output signal of the floating channel code generator (S-SCH) 424. Multiply by _SSC to print.

The summer 426 sums the outputs of the first to third multipliers 425-1 to 425-3, and the real part 427 processes the output of the summer 426 to output the BB_I signal, and the imaginary part 428 processes the output of summer 426 to output the BB_Q signal.

FIG. 6 is a block diagram illustrating a clock and a common part of FIG. 4, and FIG. 7 is a timing diagram illustrating a clock of the clock generator shown in FIG. 6.

Referring to FIG. 6, the clock related part of the clock and the common unit 421 includes an oscillator 610, a PLL 620, and a clock generator 630. The oscillator 610 is a 10 MHz crystal oscillator (OCXO), which generates a single tone of 10 MHz, and the PLL 620 generates an asynchronous chip rate of chip rate 1 (chipx1), which is an asynchronous chip rate from the input 10 MHz, and a chip rate 8 (chipx8) of 8 times. Generates a clock. The clock generator 630 divides and multiplies the input chip rate 1 (chipx1) and chip rate 8 (chipx8) to generate a 10 ms clock (pp10 ms) and a count signal (cnt_x). A 10 ms clock (pp10 ms) is a signal having a period of 10 ms and usually only asserted during one clock of one chip or eight chips. The 10 ms clock signal is a synchronization signal of the present invention, and becomes a reference signal used for synchronization and initialization of the code when the code is generated. There are count signals cnt_x that count every chip rate or every chip rate 8 based on the 10ms signal so as to generate a code of each channel smoothly.

Referring to FIG. 7, a 10 MHz clock has a period of 100 ns, a chip rate 1 (chipx1) clock has a 3.84 MHz period of 260 ns, and a chip rate 8 clock has a 30.72 MHz period of 32.5 ns. The pp10ms signal is a signal that is asserted only once (for one clock of 1 chip or 8 chips) for 10 ms, and cnt_x is a count signal at this time.

Experimental Example

In order to determine the influence of the disturbance device 930 according to the present invention in the WCDMA base station 910 and the WCDMA terminal 950, an experimental equipment system is constructed as shown in FIG.

First, the signal emitted from the WCDMA base station is applied to one terminal of the signal combiner 916 via the -56 dB attenuator 912 and the 10 dB directional combiner 914. On the other hand, the disturbance signal emitted from the disturbance device 930 is applied to the other terminal of the signal combiner 916.

The two signals input from the signal combiner 916 are combined and the combined signal is divided into two signals through the two-way divider 918 so that one signal is provided to the frequency analyzer 940. The other signal is applied to WCDMA terminal 950 via distributor 920.

Experimental Example 1

The terminal 950 is initialized while the base station 910 and the disturbance device 930 are powered on. Watch the initialization state of the terminal while gradually increasing the output power of the disturbance device (930). In this experiment, the disturbance signal is a composite signal of the common pilot channel signal and the primary and secondary synchronization channel signals.

In this experiment, the initialization of the terminal failed when the strength of the signal of the disturbance device was more than 8 dB compared to the strength of the output signal of the base station. That is, disturbance succeeded when a difference in signal strength of 8 dB or more is formed.

<Comparative Experimental Example 2>

The terminal 950 is initialized while the base station 910 and the disturbance device 930 are powered on. Watch the initialization state of the terminal while gradually increasing the output power of the disturbance device (930). In this experiment, the disturbance signal is an additive white gaussian noise (AWGN), that is, a PN signal.

In this experiment, the initialization of the terminal failed when the intensity of the additional white Gaussian noise signal of the disturbance device signal was more than 14 dB compared to the strength of the base station signal. In other words, when a difference in signal strength of 14 dB or more is formed, the initialization fails due to noise.

Experimental Example 3

When the base station 910 and the terminal 950 are busy at 12.2 kbps, the jammer 930 is turned on. Watch the call state of the terminal while gradually increasing the output power of the disturbance device (930). In this experiment, the disturbance signal is a composite signal of the common pilot channel signal and the primary and secondary synchronization channel signals.

In this experiment, when the signal strength of the disturbance device is more than 16 dB compared to the signal strength of the base station, the call state of the terminal is disconnected. That is, when a difference in signal strength of 16 dB or more is formed, the call of the terminal in communication is disconnected by the disturbance signal.

Experimental Example 4

When the base station 910 and the terminal 950 are busy at 64 kbps, the jammer 930 is powered on. Watch the call state of the terminal while gradually increasing the output power of the disturbance device (930). In this experiment, the disturbance signal is a composite signal of the common pilot channel signal and the primary and secondary synchronization channel signals.

In this experiment, when the signal strength of the disturbance device is 13dB or more compared to the signal strength of the base station, the call state of the terminal is disconnected. That is, when a difference in signal strength of 13 dB or more is formed, the busy state of the terminal is disconnected by the disturbance signal.

Comparing the Experimental Examples 1 and 2, it can be seen that the disturbance effect of the disturbance signal of the present invention is about 6 dB higher than the disturbance signal ratio of the PN signal when the terminal is initialized. However, when comparing the initialization state and the busy state of the terminal, it can be seen that a difference in signal strength of about 13 dB or more is required during a call.

Therefore, in the above experiment, when the disturbance signal obtained by synthesizing the co-pilot channel signal and the synchronization signal of the present invention is disturbed for the purpose of terminal initialization failure as compared to the disturbance signal caused by the conventional PN noise signal, an output reduction effect of about 8 dB is achieved. You can get it. Preferably, the level of the co-pilot channel signal of the disturbing apparatus is set to about 5 to 11 dB relative to the base station signal strength.

As described above, according to the present invention, if the terminal moves into a specific area within the cell coverage where the base station of the 3rd generation mobile communication asynchronous system is installed, the call information of the home country can be protected by disabling the terminal to perform the call itself. have. That is, according to the present invention, if a base station is installed between a country or a specific area such as a cease-fire line, it may block a signal of a neighboring area or a neighboring country or prevent a radio wave from being properly received from a neighboring area or a neighboring country. Can be disturbed.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the present invention without departing from the spirit and scope of the invention described in the claims below. I can understand that you can.

Claims (4)

In an asynchronous mobile communication system in which a WCDMA base station transmits an assigned main scramble code so that terminals within a corresponding cell coverage can talk. Generating a main pilot signal according to a main scramble code different from a main scramble code of the base station; Generating a PSC signal for slot synchronization; Generating an SSC signal for identifying a frame sync and a code group; Generating a baseband signal by synthesizing the main pilot signal, the main synchronization signal, and the floating signal; And And modulating the baseband signal into an RF signal, amplifying the converted RF signal to a desired level, and transmitting the RF signal to a specific region to be disturbed. The method of claim 1, wherein the baseband signal is And processing the synthesized signal to output a real (BB_I) signal and an imaginary (BB_Q) signal orthogonal to each other. The method of claim 1, wherein the sending step Generating a high frequency signal by up-converting the baseband signal to at least one operator-specific frequency band; Synthesizing the upconverted high frequency signals; Linear power amplifying the synthesized signal; And Disturbing method of the asynchronous mobile communication system, characterized in that it comprises the step of transmitting through the antenna only the signal of a predetermined band of the power-amplified signal. The method of claim 1, wherein the strength of the main pilot signal is about 5 to 11 dB higher than that of the base station signal.