CN100379303C - Method and device for blocking communication - Google Patents

Abstract

The communication blocking method and the device of the invention utilize the acquired base station system data to broadcast the broadcast control channel of the region by a signal with stronger power, then collect the temporary mobile equipment identification of the mobile unit and start to monitor whether the mobile unit has an incoming call, when judging that the mobile unit wants to receive the incoming call, the communication blocking device sends out false blocking random access information in each time slot capable of sending the random access information, so that the mobile unit can not successfully authenticate, and the incoming call can not be answered in the region.

Description

A method and device for blocking communication

technical field

The invention relates to a communication blocking method, in particular to a communication blocking method with a selectable blocking object.

Background technique

Due to the development of wireless communication system technology, wireless communication and personal mobile communication have become an indispensable part of the daily life of modern people. Global System for Mobile communication (GSM) is currently the system used by the most people in Taiwan. Due to the popularity of this kind of GSM mobile phone, the communication between people has become convenient and simple, as long as it is covered by the communication signal. Scope, you can chat with others anytime, anywhere, not limited by time and place.

Please refer to FIG. 1 , which shows a schematic diagram of a wireless communication system 10 . The wireless communication system 10 includes a plurality of base station areas (Cells) (not shown in FIG. 1 ) which are respectively provided with communication services by a base station (Base Station). Since these base station areas usually interact with each other in a similar cell structure Adjacent, so this type of wireless communication system is also often referred to as a community-based wireless communication system. To simplify the description, FIG. 1 includes a base station area 12 and a base station area 20 , wherein the base station area 12 is provided with a base station 14 to provide communication services, and the base station area 20 is provided with a base station 18 to provide communication services. The service areas of the base station area 12 and the base station area 20 both include a mobile unit (Mobile Subscriber, MS) 16. The mobile unit 16 is used to transmit and receive wireless communication signals and communicate with the base station to connect to the network. Here, since the mobile unit 16 is within the service area of the base station area 12 and the base station area 20 at the same time, the mobile unit 16 can transmit and receive signals from the base station 14 and the base station 18 at the same time, so the mobile unit 16 usually selects the signal strength of the base station 14 and the base station 18 The stronger base station is used as the serving cell area (Serving Cell), to log in (camp on) the serving base station area and start the next work, and when the mobile unit 16 moves and causes the signal strength in the base station 18 to reach a certain level of change, The mobile unit 16 will perform a login confirmation action.

Although the current mobile communication system is convenient, it has some shortcomings in use. For example, in some public speaking occasions, classes or movie theaters, mobile phone users often forget to turn off the mobile phone or forget to switch the mobile phone to oscillation mode. In the past, concert halls used radio wave isolation or radio wave interference to completely block communication services regionally, but this caused the inconvenience that people who should receive communication services could not communicate. Therefore, the present invention does not completely block the communication channel, allowing the user to enter the coverage area without displaying no system service, and the user cannot receive incoming calls, but can make calls normally.

Contents of the invention

A communication blocking method disclosed in the present invention is suitable for a communication blocking device to block a base station from establishing communication with a mobile unit. The method includes: (a) receiving a first broadcast control channel transmitted by the base station and read a system information; (b) according to the system information, transmit a second broadcast control channel signal whose power is greater than that of the first broadcast control channel signal within a predetermined range; (c) enter a predetermined range according to the mobile unit And detect that the signal strength of the second broadcast control channel is greater than the signal strength of the first broadcast control channel and log into the communication blocking device; to collect an identification code of the mobile unit within the predetermined range; and (d) receive a A common control channel signal, when the common control channel signal has the identification code associated with it, sending a plurality of blocking random access messages within a predetermined time, the number of the plurality of blocking random access messages being greater than that of the mobile unit The number of multiple access attempts with this base station.

The present invention discloses a communication blocking device that can select blocking objects, and is used to block the communication link between a base station and a mobile unit. The base station transmits a first broadcast control channel signal and a common control channel signal. The blocking device includes: a receiver, used to receive the first broadcast control channel signal and the common control channel signal; a transmitter, used to send a blocking signal and transmit a predetermined range whose power is greater than the first A second broadcast control channel signal of the broadcast control channel signal; a list storage module, used to store a blocking list; a logic judgment module, used to base on a blocking list and when the common control channel signal has a temporary mobile device identification code, determine that the transmitter sends the blocking signal to a processing unit; wherein, when the mobile unit sends a temporary mobile device identification code, the processing unit stores the temporary mobile device identification code in the blocking list, The transmitter transmits the blocking signal within a predetermined period of time when the common control channel signal has the TEMI.

Description of drawings

FIG. 1 is a schematic diagram of a wireless communication system.

FIG. 2 is a schematic diagram of communication between the communication blocking device of the present invention and the base station and the mobile unit.

FIG. 3 is a flow chart of a communication blocking method for selectively blocking objects according to the present invention.

FIG. 4 is a schematic diagram of a communication blocking device for selectively blocking objects according to the present invention.

Description of reference symbols

10 wireless communication system

12, 20 base station area

14, 18 base stations

16 mobile units

13 areas

24, 30 communication blocking device

32 antennas

34 receivers

36 Conveyor

37 power detection module

38 Analog to Digital Converter/Digital to Analog Converter

39 list storage module

41 logic judgment module

42 encoding/decoding modules

44 processing units

46 personal computers

Detailed ways

Please refer to Figure 2. FIG. 2 is a schematic diagram of communication between the communication blocking device 24 of the present invention and the base station 14 and the mobile unit 16 . The area covered by the signal of the base station 14 in the figure is the base station area 12 , and the mobile unit 16 and the communication blocking device 24 are both included in the base station area 12 . The base station 14 will use a broadcast control channel (Broadcast Control Channel, BCCH) to send out an identification signal about the base station 14, and this identification signal is provided to the mobile unit 16 for authentication, including the authentication of the mobile unit country code (MobileCountry Code, MCC), the mobile unit Authentication of Mobile Network Code (MNC), or authentication of Location Area Code (LAC). Except that the mobile unit 16 will compare with the identification signal on the broadcast control channel, the communication blocking device 24 of the present invention will also draw (siphon) the required identification signal or other information from the broadcast control channel, Then some data of the base station 14 are stored for use in simulating a base station 14 .

Then, the communication blocking device 24 simulates the base station 14, and sends the same broadcast control channel signal (BCCH' in the figure) to the area 13 according to the information obtained from the base station 14, and the communication blocking device 24 will first measure The power transmitted by the base station 14 makes the power of the BCCH' signal transmitted by the communication blocking device 24 stronger than the power of the BCCH signal transmitted by the base station 14 in the area 13 .

When the mobile unit 16 enters the area 13 and receives the BCCH signal from the base station 14 and the BCCH' signal from the communication blocking device 24, the mobile unit 16 will receive a stronger signal from the communication blocking device 24 , and the communication blocking device 24 is regarded as another base station, and the step of logging in (camp on) is carried out, and the identification data 21 corresponding to the mobile unit 16 is transmitted; The identification data 21 of the unit 16 is stored in a blocking list in the communication blocking device 24. The identification data 21 is usually a temporary mobile equipment identification (TMSI: Temporary Mobile Subscriber Identity) in the GSM system, which is used to establish with the base station Temporary identification code required for communication.

The communication blocking device 24 starts to monitor the call signal of the mobile unit 16, if the base station 14 sends a phone message to the mobile unit 16, the communication blocking device 24 and the mobile unit 16 will detect this phone message simultaneously, and the communication blocking device 24 It will start to compare the blocking list to determine whether the mobile unit 16 belongs to the object of blocking. After comparing and confirming, it is determined that the external speech of the mobile unit 16 must be blocked, and then the communication blocking device 24 will send false messages to each random access time slot (Random Access, RA, time slot) within a predetermined time T. Blocking random access information (blocking RA), this random access time slot was originally the random access time slot for the mobile unit 16 to start linking with the base station 14, so that the base station 14 simultaneously receives the communication blocking device 24 and the signal transmitted by the mobile unit 16, so the base station 14 will determine that the signal in the time slot is an invalid signal due to signal collision and interference, and the mobile unit 16 will not be able to complete the authentication procedure with the base station 14, and will not be able to receive the call ; The predetermined time T is greater than the time for the mobile unit 16 to establish communication with the base station 14 and perform random access retry.

Please refer to Figure 3. FIG. 3 is a flow chart of a communication blocking method for selectively blocking objects according to the present invention. This method is implemented by a communication blocking device. Step 100 performs a cell selection step. Like a mobile unit, a communication blocking device must select a base station with the strongest signal strength and a suitable base station for communication. The process of selecting the base station area according to the signal strength of the broadcast control channel sent by the base station is called cell selection. The process of cell selection is judged by two parameters C1 and C2, as stipulated in ETSI 05.08, the definition of C1 is as follows:

C1=(A-Max(B,0)); where

A=RLA_C-RXLEV_ACCESS_MIN;

RLA_C is the average power of the carrier of the signal;

RXLEV_ACCESS_MIN is the minimum signal strength that a mobile unit can connect to the system;

B = MS_TXPWR_MAX_CCH-P;

MS_TXPWR_MAX_CCH is the maximum value that has not yet been power controlled on the broadcast control channel;

P is the maximum output power of the mobile unit;

If the C1 value of a certain base station area is greater than zero, it means that this base station area is suitable for the mobile unit to log in, and the base station area with the largest C1 value will be selected as the base station area for the mobile unit to log in. If the mobile unit is in a moving state (during the movement, the parameter C1 of the detected base station area will change), or if the previously selected base station area refuses to accept communication and other reasons, the parameter C2 must be used again , to determine the selected base station area. C2 is defined as follows:

C2=C1+CELL_RESELECTION_OFFSET-TEMPORARYOFFSET*H(PENALTY_TIME-T);

Equal to PENALTY_TIME<>11111

Among them, for the non-serving base station area

H(x)＝0 for x＜0

＝1 for x≥0;

For the base station area being served

H(x)=0;

Step 100 is to detect a broadcast control channel suitable for the mobile unit to log in among a plurality of broadcast control channels in the public land mobile network according to these cell selection procedures.

Step 110 measures the power of all broadcast control channels that can allow the mobile unit to log in, and sorts the broadcast control channel allocation list (BCCH) of each different public land mobile network (PublicLand Mobile Network, PLMN) according to the measured power of these broadcast control channels Allocation list). Step 120 performs time synchronization (synchronization) with these base stations according to a synchronous burst signal sent by all the base stations that allow the mobile unit to log in after being scanned in step 100 . Once the time is synchronized with a base station, step 130 can be performed to receive a first broadcast control channel (BCCH) signal transmitted by the synchronized base station and read out a system information.

As mentioned above, when a mobile unit enters the area of a base station and logs into the base station, it must go through some authentication procedures, such as the identification check of the country code of the mobile unit, the network code of the mobile unit and the location area code. The communication blocking method of the present invention is similar to simulating the communication blocking device as a false base station, so that mobile units in a predetermined area can log in the identification data to the false base station. Therefore, to simulate such a false base station, it is necessary to obtain The identification information and other relevant data on the original base station, step 130 accomplishes this purpose, extracting the system information from the broadcast control channel in the appropriate public land mobile network.

In step 110, the broadcast control channel allocation list of different public land mobile networks is generated. In step 140, the communication blocking device transmits a second broadcast control channel signal with stronger power in this area according to the broadcast control channel allocation list. A predetermined range, and the second broadcast control channel has the system information extracted from step 130. At this time, the communication blocking device simulates a base station in the predetermined area, and the signal transmission power of the communication blocking device is within a predetermined range. It is stronger than other nearby base stations in the area. It should be noted that the power of the first broadcast control channel is greater than other broadcast control channels within the predetermined range, and the power of the second broadcast control channel signal is within the predetermined range. The range is larger than the first broadcast control channel signal. The relatively powerful broadcast channel will induce the mobile units in the area of the base station to log in to the communication blocking device; even if the mobile unit does not log in the identification data to the communication blocking device when entering the predetermined area, according to GSM According to the standard, the mobile unit will send the identification data to the communication blocking device to obtain it due to confirming whether it is still in the base station within a predetermined period of time.

The blocking method of the present invention can select some specific objects to block, that is to say, the method will block specific mobile units. In step 150, the Temporary Mobile Identity (TMSI) of the specific blocking object within the predetermined range is collected. Step 160 receives a common control channel signal, and determines whether the relevant temporary mobile device identification of step 150 is contained in the common control channel signal. If after judging, it is found that the base station sends a telephone message to the mobile unit to be blocked, in step 170, a blocking signal is sent within a predetermined time, wherein the predetermined time includes a plurality of random access time slots in a time division multiple access (TDMA) system . Using false blocking random access information (Blocking RA), let the random access information of the mobile unit collide with the blocking signal. After a period of time, it is determined that the connection establishment fails. The predetermined time is greater than the time for the mobile unit to establish communication with the base station and perform random access retry. Take the number of slots. Therefore, although the mobile unit has an incoming call but has not been authenticated successfully, it is not impossible to establish a link with the base station. After the temporary mobile device identification of the integrated service digital network list of all mobile units is collected, the communication blocking device stops broadcasting, and the mobile unit can still log in to the correct network to obtain the calling service. The method flow in FIG. 3 is a preferred sequence of the present invention, and users can change the sequence of steps according to different requirements to suit different applications. The communication blocking method for optional objects of the present invention can be used for blocking incoming calls in GSM communication.

Please refer to Figure 4. FIG. 4 is a schematic diagram of a communication blocking device 30 for selectively blocking objects according to the present invention. The communication blocking device 30 includes an antenna 32, a receiver 34, a transmitter 36, a power detection module 37, an analog-to-digital converter/digital-to-analog converter 38, a list storage module 39, a logic judgment module 41, an encoding/decoding module 42, A processing unit 44 and a personal computer 46 . The receiver 34 and the transmitter 36 transmit and receive wireless signals through the antenna 32 . The signals received by the receiver 34 include broadcast control channel signals and common control channel signals transmitted by the base station. The transmitter 36 is used to send a blocking signal and send a second broadcast control channel signal in a predetermined area, the second broadcast control channel signal corresponds to the broadcast control channel signal transmitted by the base station, that is, the transmitter 36 executes the broadcast control channel signal shown in Figure 3 In step 140 and step 190, transmit the second broadcast control channel signal with relatively strong power covering a predetermined range, and send blocking random access information (blocking RA) within a predetermined time.

The list storage module 39 in FIG. 4 is used to store a blocking list. The power detection module 37 is connected with the receiver 34 and is used for detecting the power of the broadcast control channel signal transmitted by the base station. The processing unit 44 stores the temporary mobile device identification code issued by the mobile unit in the blocking list, and also assists in the execution of steps 100 , 120 , 130 and 170 in FIG. 3 . The logic judgment module 41 is to assist in realizing step 160 of FIG. To fetch information, the transmitter transmits the blocking signal within a predetermined period of time when the shared control channel signal has the temporary mobile equipment identification code. The analog-to-digital converter/digital-to-analog converter 38 is used to process the conversion between analog signals and digital signals, and the encoding/decoding module 42 decodes or encodes the signals from the receiver 34 and the transmitter 36 . Processing unit receiver The optional communication blocking device of the present invention can be used for blocking calls in GSM communication.

In order to avoid disturbing other people due to the ringing of the mobile unit’s incoming call in public places such as classes or concerts, the present invention uses a communication blocking device to first obtain the system data of a base station, then simulate the behavior of a base station, and allocate The list broadcasts the broadcast control channel with a relatively strong signal, and then obtains the temporary mobile device identification of the mobile unit and starts to monitor whether the mobile unit has an incoming call. When it is judged that the mobile unit is about to receive an incoming call, the communication blocking device sends false blocking random access information in each time slot that can send random access information, so that the mobile unit's random access information and blocking random access information The information collides, so that although the mobile unit has an incoming call, it cannot be authenticated successfully, and there will be no caller ID. The communication blocking method and device capable of selecting blocking objects of the present invention can effectively block irregular incoming calls without affecting users who need to make calls. Compared with the prior art, the present invention realizes the previously unattainable function of only blocking incoming calls without interfering with outgoing calls with a low-cost, low-complexity method and device.

The above descriptions are only preferred embodiments of the present invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the patent of the present invention.

Claims (9)

1. A method for blocking communication, suitable for a communication blocking device, used to block a base station to establish communication with a mobile unit, the method comprising: (a) receiving a first broadcast control channel signal transmitted by the base station and reading out a system information; (b) according to the system information, transmit a second broadcast control channel signal with a power greater than that of the first broadcast control channel signal within a predetermined range; (c) According to the mobile unit entering a predetermined range and detecting that the signal strength of the second broadcast control channel is greater than the signal strength of the first broadcast control channel and logging into the communication blocking device, it is used to collect the mobile unit within the predetermined range an identification code for ; and (d) receiving a common control channel signal transmitted from the base station, when the common control channel signal has an identification code associated with the mobile unit, sending a plurality of blocking random access messages in a predetermined time, the plurality of The number of blocking random access messages is greater than the number of multiple access attempts by the mobile unit and the base station. 2. The method as claimed in claim 1, the step (a) further comprising: detecting a first broadcast control channel suitable for the mobile unit to log in among the plurality of broadcast control channels in the public land mobile network. 3. The method of claim 2, wherein the power of the first broadcast control channel is greater than that of other broadcast control channels within the predetermined range. 4. The method as claimed in claim 1, the step (d) further comprising: the communication blocking device sends a signal at the predetermined time simultaneously with the mobile unit. 5. The method of claim 4, wherein the predetermined time comprises a plurality of random access time slots in a time division multiple access system. 6. A communication blocking device that can select blocking objects, used to block the communication link between a base station and a mobile unit, the base station transmits a first broadcast control channel signal and a common control channel signal, the blocking Breakout devices include: A receiver, used to receive the first broadcast control channel signal and the common control channel signal, and read a system information from the first broadcast control channel signal; a transmitter for transmitting a blocking signal and a second broadcast control channel signal whose power is greater than the first broadcast control channel signal within a predetermined range; A list storage module, used to store a blocking list; A logic judgment module, used for determining that the transmitter sends the blocking signal according to a blocking list and when the common control channel signal has a temporary mobile equipment identification code; a processing unit; wherein, When the mobile unit sends a TEMI, the processing unit stores the TEMI in the blocking list, and when the common control channel signal has the TEMI, the transmitter is at one time The blocking signal is sent in a plurality of random access time slots of a divisional multiple access system, and the number of retries of the mobile unit to connect to the base station is less than the number of the plurality of random access time slots. 7. The communication blocking device as claimed in claim 6, when the mobile unit detects that the power of the second broadcast control channel is greater than that of the first broadcast control channel, it sends out the temporary mobile device identification code. 8. The communication blocking device as claimed in claim 6, further comprising a power detection module for detecting the power of the first broadcast control channel signal transmitted by the base station to adjust the second broadcast control channel signal power size. 9. The communication blocking device as claimed in claim 6, wherein the mobile unit transmits a For a link signal, the blocking signal is transmitted in the same time slot as the link signal.

Images