TWI675602B - Method and apparatus for identifying pseudo base station - Google Patents

Abstract

This solution provides at least one pseudo base station cell identification method and device. One of the pseudo base station cell identification methods includes: receiving system information of a target cell; and judging the target cell based on the system information of the target cell received. Whether it is included in a real cell list; when the target cell is included in the real cell list, the received system information of the target cell is compared with the system information corresponding to the target cell in the real cell list to A first comparison result is generated; and whether the target cell is a pseudo base station cell is determined according to the first comparison result.

Description

Method and device for identifying pseudo base station cell

The invention relates to the identification of a pseudo-base station, and more specifically, to a method and a device for identifying a pseudo-base station cell suitable for a communication device.

With the rapid development of wireless communication technologies such as GSM technology, W-CDMA technology, and LTE technology, single-mode mobile phones and multi-mode mobile phones have been widely used, and criminals often send spam text messages (or SMS), advertising promotion, fraud, etc., which seriously affects the user experience.

Generally speaking, a pseudo base station is composed of a host (simulator), a terminal (also called an engineering terminal), a notebook computer, and a signal jammer. The pseudo base station obtains the broadcast control channel (BCCH) frequency and field strength (BTS output power) information of the 2G neighbor cell (adjacent cell) through the engineering machine, and selects the 2G cell for camouflage. Adjust the signal strength of the pseudo base station and inhale the mobile terminal to camp on. When a mobile terminal resides in a 3G or 4G cell, the pseudo base station will force the mobile terminal to reside in the pseudo base station through a signal jammer. After the pseudo base station sends junk short messages to the mobile terminal, it will force the mobile terminal to leave the pseudo base station cell.

The existing pseudo base station identification methods are mainly implemented by detecting the change of the location area code (LAC) of the serving cell. To identify the pseudo base station cell in this way, the mobile terminal must first reside in the pseudo base station cell, which cannot avoid the intrusion of junk short messages in the pseudo base station cell. In addition, the pseudo base station can adjust the length of the periodic location update (Location Update) to achieve that after sending spam short messages, the LAC is not changed and the location update is triggered in a short time. The existing pseudo base station identification mechanism In this case, the existence of a pseudo base station cell cannot be detected.

Therefore, there is an urgent need to propose a new method of identifying pseudo base stations that can prevent the presence of pseudo base station communities.

In view of this, the present invention provides a method and device for identifying a pseudo base station cell, and can prevent a method of staying in a pseudo base station cell.

Before staying, the mobile terminal performs a pseudo base station pre-judgment on the target cell based on the a priori information and the system information (System Information, SI) of the target cell to avoid camping on the pseudo base station cell. After staying, the mobile terminal performs pseudo base station identification on the serving cell according to its own behavior, so that after staying in the pseudo base station cell, it can leave the pseudo base station cell as soon as possible, and prevent the pseudo base station cell from staying in the cell again.

A method for identifying a pseudo base station cell according to an embodiment of the present invention is applicable to a communication device. The method for identifying a pseudo base station cell includes: receiving system information of a target cell; and judging based on the system information of the target cell received. Whether the target cell is included in the real cell list; when the target cell is included in the real cell list, the received system information of the target cell and the system information corresponding to the target cell in the real cell list are updated. Performing a comparison to generate a first comparison result; and determining whether the target cell is a pseudo base station cell according to the first comparison result.

The method for identifying a pseudo base station cell according to an embodiment of the present invention, wherein the step of determining whether the target cell is a pseudo base station cell according to the first comparison result includes: when the first comparison result indicates that the target is received When the difference between the system information of the cell and the system information corresponding to the target cell in the real cell list is greater than or equal to the first threshold, it is determined that the target cell is a pseudo base station cell. The method for identifying a pseudo base station cell according to an embodiment of the present invention further includes: determining whether the target cell is included in the pseudo base station cell list according to the received system information of the target cell; when the target cell is included in the pseudo base station cell list; When the base station cell list is included, it is determined that the target cell is a pseudo base station cell. The method for identifying a pseudo base station cell according to an embodiment of the present invention further includes: when the target cell is not included in the real cell list, the system information of the target cell and the pseudo base station identification table are received. The information is compared to generate a second comparison result; and the target cell is determined to be a pseudo base station cell according to the second comparison result. According to an embodiment of the present invention, the step of determining whether the target cell is a pseudo base station cell according to the second comparison result includes: when the second comparison result indicates that the system information of the target cell is received and the pseudo base station is identified When the number of the same parameters of the information in the table is greater than or equal to the second threshold, it is determined that the target cell is a pseudo base station cell; or a part or all of the parameters of the system information of the target cell and the pseudo base station are received. The corresponding corresponding part or all parameters in the identification table are compared, and the weights corresponding to the system information of the target cell and one or more parameters appearing simultaneously in the pseudo base station identification table are accumulated. When the accumulated weights and Greater than or equal to the third threshold When determining that the target cell is a pseudo base station cell; or comparing some or all parameters of the system information of the target cell received with corresponding part or all parameters in the pseudo base station identification table, according to the target The corresponding value range of the value of the part or all parameters of the cell in the preset value range of the corresponding part or all parameters in the pseudo base station identification table is used to determine the corresponding weight, and the corresponding weights are accumulated. The weight of the part or all of the parameters of the target cell should be determined. When the cumulative weight sum is greater than or equal to the fourth threshold, the target cell is determined to be a pseudo base station cell. According to an embodiment of the present invention, the pseudo base station identification table includes part or all of the information units in the system information of the cell, and the value range of the part or all of the information units is different from the normal base station cell according to the system information of the pseudo base station cell. The main characteristics to formulate. According to an embodiment of the present invention, the pseudo base station cell list is used to record information of the pseudo base station cell that the mobile terminal has identified. According to an embodiment of the present invention, the real cell list is used to record information of real cells that the mobile terminal has successfully camped on. The method for identifying a pseudo base station cell according to an embodiment of the present invention further includes: updating the information of the pseudo base station cell list according to the information of the target cell identified as the pseudo base station. According to an embodiment of the present invention, the cell information in the pseudo base station cell list has a valid time. According to an embodiment of the present invention, the cell information in the real cell list has a valid time.

The method for identifying a pseudo base station cell according to another embodiment of the present invention is applicable to a communication device. The method for identifying a pseudo base station cell includes: when the communication device receives a short message within a first predetermined time after staying in a target cell; When the message is received, determine whether the location update is triggered within the second predetermined time after the communication device receives the short message, and whether the network corresponding to the target cell rejects the location The update request; and when the communication device triggers the location update again within the second predetermined time after receiving the short message and the network corresponding to the target cell rejects the request for the location update, the target cell is determined to be false Base station community.

The method for identifying a pseudo base station cell according to an embodiment of the present invention further includes: if the location update is not triggered within the second predetermined time after the communication device receives the short message or the network corresponding to the target cell does not reject the The location update request determines whether the communication device receives a quantity greater than or equal to the control channel in the third predetermined time after the short message is received when the signal quality of the target cell is not lower than a predetermined level. Bad blocks of the fifth threshold; and when the communication device receives a number of bad blocks greater than or equal to the fifth threshold on the control channel within a third predetermined time after receiving the short message, determining the target cell as Pseudo base station cell. According to an embodiment of the present invention, information of the target cell determined as the pseudo base station cell is added to the pseudo base station list. The method for identifying a pseudo base station cell according to another embodiment of the present invention further includes: when the communication device does not receive the short message within the first predetermined time after staying in the target cell, determining that the target cell is non- Pseudo base station cell; according to another embodiment of the present invention, when the location update is not triggered within the second predetermined time after the communication device receives the short message, or the network corresponding to the target cell does not reject the location When updating the request, if the signal quality of the target cell is not lower than a predetermined level, it is determined that the communication device has not received the quantity on the control channel within the third predetermined time after receiving the short message. A bad block that is greater than or equal to the third threshold value determines that the target cell is a non-pseudo-base station cell. According to an embodiment of the present invention, information of the target cell determined to be a non-pseudo base station cell is added to the real cell list.

A communication device according to an embodiment of the present invention includes: a processor that determines whether the target cell is included in the real cell list according to the system information of the target cell received, and when the target cell is included in the real cell list When the received system information of the target cell is compared with the system information corresponding to the target cell in the real cell list to generate a first comparison result, and whether the target cell is determined according to the first comparison result It is a pseudo base station cell. According to an embodiment of the present invention, when the target cell is not included in the real cell list, the processor compares the system information of the target cell received with the information in the pseudo base station identification table to generate a second comparison. As a result, it is determined whether the target cell is a pseudo base station cell according to the second comparison result.

A communication device according to an embodiment of the present invention includes: a processor configured to, when the communication device receives a short message within a first predetermined time after residing in a target cell, determine that the communication device receives the short message after receiving the short message. Whether the location update is triggered within the second predetermined time, and whether the network corresponding to the target cell rejects the location update request, and when the communication device triggers the location update again within the second predetermined time after receiving the short message When the network corresponding to the target cell rejects the request for the location update, the processor determines that the target cell is a pseudo base station cell. According to an embodiment of the present invention, if the location update is not triggered within the second predetermined time after the communication device receives the short message or the network corresponding to the target cell does not reject the location update request, the target cell is located in the target cell. When the signal quality is not lower than a predetermined level, the processor determines whether the communication device receives a number of bad blocks greater than or equal to a fifth threshold on the control channel within a third predetermined time after receiving the short message. , And when the communication device receives more than or on the control channel within a third predetermined time after receiving the short message When the bad block is equal to the fifth threshold, the processor determines that the target cell is a pseudo base station cell. According to an embodiment of the present invention, when the communication device does not receive the short message within the first predetermined time after camping on the target cell, the processor determines that the target cell is a non-pseudo base station cell; or when When the location update is not triggered within the second predetermined time after the communication device receives the short message, or the network corresponding to the target cell does not reject the request for the location update, the signal quality of the target cell is not low In the case of a predetermined level, if the communication device does not receive a number of bad blocks greater than or equal to the fifth threshold value on the control channel within the third predetermined time after receiving the short message, the processor It is determined that the target cell is a non-pseudo base station cell.

One of the advantages of the at least one pseudo base station cell identification method and device provided by the present invention is that it can effectively prevent and reduce the occurrence of mobile terminals staying in pseudo base stations, and reduce the probability of mobile terminals receiving fraudulent short messages and advertising promotion. This improves the user experience.

100‧‧‧ communication device

110‧‧‧ baseband signal processing device

120‧‧‧RF signal processing device

130, 510‧‧‧ processors

140, 520‧‧‧Memory devices

210 ~ 270, 330 ~ 360, 410 ~ 460‧‧‧step

500‧‧‧Pseudo-base station identification device

FIG. 1 is a block diagram of a communication device according to an embodiment of the present invention.

FIG. 2 is a pre-judgment flowchart of a pseudo base station cell according to an embodiment of the present invention, wherein FIG. 2A is a prediction of a pseudo base station cell when prior information of the pseudo base station cell exists according to an embodiment of the present invention. Decision flow chart. FIG. 2B is a pre-judgment flowchart of a pseudo base station cell without prior information according to an embodiment of the present invention.

FIG. 3 is a flowchart of identifying a pseudo base station cell according to an embodiment of the present invention.

FIG. 4 is a pseudo base station identification table according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a pseudo base station cell identification device 500 according to an embodiment of the present invention.

Certain terms are used in the description and the scope of patent applications to refer to specific elements. Those of ordinary skill in the art should understand that hardware manufacturers may use different terms to refer to the same component. The scope of this specification and the patent application does not use the difference in names as a way to distinguish components, but rather uses the difference in functions of components as a criterion for distinguishing components. The terms "including" and "including" mentioned throughout the description and the scope of the patent application are open-ended terms and should therefore be interpreted as "including but not limited to." "Approximately" means that within the acceptable error range, those with ordinary knowledge in the field can solve the technical problem within a certain error range, and basically achieve the technical effect. In addition, the term "coupled" includes any direct and indirect electrical connection means. Therefore, if a first device is described as being coupled to a second device, it means that the first device can be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means. Device. The term "connected" includes any direct and indirect, wired and wireless means of connection. The following is a preferred way to implement the present invention. The purpose is to explain the spirit of the present invention and not to limit the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

FIG. 1 is a block diagram of a communication device according to an embodiment of the present invention. The communication device 100 may be a mobile terminal, a notebook computer, a mobile phone, a portable game device, a portable multimedia player, a Global Positioning System (GPS), a receiver, a personal digital assistant (PDA), Tablet or other device. The communication device 100 may include a baseband (BB) signal processing device 110, a radio frequency (RF) signal processing device 120, a processor 130, a memory device 140, and an antenna module including at least one antenna. It is worth noting that, in order to clearly illustrate the concept of the present invention, FIG. 1 is a simplified block diagram in which only elements related to the present invention are shown in the figure. However, the present invention is not limited to the embodiment shown in FIG. 1.

The radio frequency signal processing device 120 may receive radio frequency signals through an antenna, and process the received radio frequency signals to convert the received radio frequency signals into baseband signals to be processed by the baseband signal processing device 110, or receive the signals from the baseband signal processing device 110. Baseband signal, and convert the received baseband signal into a radio frequency signal to be transmitted. The RF signal processing device 120 may include multiple hardware components for performing RF conversion. For example, the radio frequency signal processing device 120 may include a power amplifier, a mixer, or other components. The baseband signal processing device 110 may further process the baseband signal to obtain information or data transmitted by the wireless network. The baseband signal processing device 110 may also include multiple hardware devices for performing baseband signal processing. Baseband signal processing may include similar-to-digital conversion (ADC) / digital-to-analog conversion (DAC), gain adjustment, modulation / demodulation, encoding / decoding, and the like. The processor 130 can control the operation of the baseband signal processing device 110 and the radio frequency signal processing device 120, perform the main processing of the pseudo base station cell identification, and maintain necessary information for the pseudo base station identification. According to an embodiment of the present invention, the processor 130 may execute software module code corresponding to the baseband signal processing device 110 and / or the radio frequency signal processing device 120. When the code is executed, the specific data in the code combined with the data structure can also be regarded as a processor logic unit or a stack instance. Therefore, a processor can be viewed as containing multiple Each processor logic unit is configured to execute a predetermined function or task corresponding to one or more software modules.

According to an embodiment of the present invention, the RF signal processing device 120 combined with the baseband signal processing device 110 can be regarded as a wireless device that can communicate with a wireless network to provide wireless communication services according to a Radio Access Technology (RAT). Communication module. It is worth noting that, in some embodiments, the communication device 100 can be further expanded to include more than one antenna or more than one wireless communication module. Therefore, the present invention is not limited to the embodiment shown in FIG. 1.

According to an embodiment of the present invention, the memory device 140 may also be located outside the communication device 100 and coupled to the processor through an appropriate connection method. The present invention is not limited thereto. In addition, in some embodiments of the present invention, the processor may be configured in the baseband signal processing device 110, or the communication device 100 may further include another processor configured in the baseband signal processing device 110. Therefore, the present invention is not limited to the architecture shown in FIG.

Please note that for the convenience of description, the following description in the specification will take a mobile terminal as one of the embodiments of the communication device 100. However, those skilled in the art can understand that the present invention is not limited to this.

According to an embodiment of the present invention, the memory device 140 may store prior information (priori information) identified by the pseudo base station. The prior information includes a pseudo base station cell list and a real cell list, and is used to record the corresponding mobile terminal. Information about one or more communities. According to an embodiment of the present invention, the pseudo base station cell list is used to record information of the pseudo base station cell that the mobile terminal has identified. The real cell list is used to record the real cell information that the mobile terminal has successfully camped on. The cell information recorded in the two tables may include cell identification, system information, and so on. Give For example, the cell identifier included in the real cell list and / or the pseudo base station cell list may be, for example, a cell ID, an Absolute Radio Frequency Channel Number (ARFCN), and a base station identification code ( Base Station Identity Code (BSIC), etc., the system information included in the real cell list and / or the pseudo base station cell list may be, for example, a radio link timeout value (RADIO-LINK-TIMEOUT), a cell reselection offset (CELL_RESELECT_OFFSET) , The minimum receiving level (RXLEV-ACCESS-MIN) allowed by the mobile station (MS), the maximum transmitting power level (MS_TXPWR_MAX_CCH) of the MS control channel, etc. According to an embodiment of the present invention, the system information included in the real cell list and / or the pseudo base station cell list may also include the SI code stream (such as SI3, SI4, etc.) received by the MS, and the MS average reception level (RLA_C )Wait. Those with ordinary knowledge in the field can understand that the above is only an example of the parameters of the real cell list and / or the pseudo base station cell list, which can be determined according to the actual communication environment, and the present invention is not limited thereto. The two tables may further include the valid time of the corresponding cell information. The processor of the mobile terminal may delete the information of the expired cells in the two tables according to the valid time.

According to an embodiment of the present invention, the memory device 140 may further store a pseudo base station identification table. The information in the pseudo base station identification table includes part of the information element (IE) or all IEs in the system information (System Information) of the cell. The value range of the parameter information of these information units is based on the difference of the pseudo base station cell. The main characteristics of the system information in the normal base station area are formulated. For a further description of the pseudo base station identification table, please refer to the following description with reference to Figure 4.

FIG. 2 is a pre-judgment flowchart of a pseudo base station cell according to an embodiment of the present invention, wherein FIG. 2A is a prediction of a pseudo base station cell when prior information of the pseudo base station cell exists according to an embodiment of the present invention. Decision flow chart. FIG. 2B is a pre-judgment flowchart of a pseudo base station cell without prior information according to an embodiment of the present invention. In FIG. 2A, the mobile terminal receives system information of the target cell in step 210, and based on the stored prior information of the pseudo base station cell (pseudo base station cell list), the processor of the mobile terminal determines whether the target cell exists in List of pseudo base station cells (step 220). If the target cell information is included in the pseudo base station cell list, the mobile terminal determines that the target cell is a pseudo base station cell in step 260, does not camp, and updates the pseudo base station cell list in step 260; otherwise, the mobile terminal will In step 230, it is determined whether the target cell exists in the real cell list. If the target cell exists in the real cell list, the mobile terminal compares the system information of the target cell with the system information of the same identified cell in the real cell list in step 240, and determines whether the target cell is a pseudo base station cell according to the comparison result (step 250). . Specifically, the mobile terminal may determine in step 250 how much the system information of the target cell differs from the system information of the same identified cell in the real cell list (e.g., how much of the system information of the target cell and the system information of the same identified cell in the real cell list exist) Different IEs, and compare the number of different IEs with thresholds). If there are more than N (or no less than N) IEs that are different (N is a natural number), the mobile terminal may determine that the target cell is a pseudo base station cell in step 260 and cannot stay there, and update the pseudo base station cell List, the information of the target cell is stored in the pseudo base station cell list; otherwise, the mobile terminal may determine that the target cell is a real cell (non-pseudo base station cell) in step 270 and try to camp. Please note that by judging the system information of the target cell and the real cell line The method of determining whether the target cell is a pseudo-base station cell by using different numbers of IEs in the system information of the same identification cell in the table is only an example of the present invention. Other alternative methods can also be used to determine whether the target cell is a pseudo base station cell based on the comparison result between the system information of the target cell and the system information of the same identified cell in the real cell list, which is not limited in the present invention. If the mobile terminal determines in step 230 that the target cell does not exist in the real cell list, it proceeds to FIG. 2B to perform a pseudo-base station pre-judgment on the target cell by using no prior information.

In Figure 2B, if there is no prior information of the target cell, the mobile terminal compares the system information of the target cell with the information in the pseudo base station identification table (such as the parameters of the system information) in step 330, and according to The comparison result determines whether the target cell satisfies the pseudo base station judgment criterion (step 340). If it is determined in step 340 that the target cell meets the pseudo base station determination criterion, the mobile terminal determines that the target cell is a pseudo base station cell in step 350 and cannot camp, and updates the pseudo base station cell list to update the system information of the target cell. Store in the pseudo base station cell list; otherwise, the mobile terminal determines in step 360 that the target cell is a non-pseudo base station cell and attempts to camp. The pseudo base station judgment criterion in step 340 can be implemented in various ways. According to various embodiments of the present invention, the pseudo base station judgment criterion in step 340 may include: Criterion 1: If the system information of the target cell and the pseudo base station identification table There are more than (or no less than) M IEs with the same value range (M is a natural number), then the target cell is determined to be a pseudo base station cell; or criterion 2: is a part of the pseudo base station identification table or Set the corresponding weights for all parameter information, and set the system information of the target cell and the pseudo base Compare the part or all of the parameter information in the station identification table, accumulate the weights corresponding to the system information of the target cell and one or more parameters appearing simultaneously in the pseudo base station identification table. When the accumulated weights are greater than (or not less than) ) When the threshold value T1 (T1 is a real number), the target cell is determined to be a pseudo base station cell; or criterion three: Part or all of the parameters in the pseudo base station identification table are pre-divided into different value range intervals according to their value ranges. , And set different weights for different preset value range intervals. When comparing the system information of the target cell with the part or all of the parameter information in the pseudo base station identification table, according to the corresponding value of the IE in the target cell system information in the corresponding parameter value range of the pseudo base station identification table, Value range to determine the corresponding weight. After determining the weights corresponding to some or all of the IEs in the system information of the target cell, these weights are accumulated, and when the accumulated weight is above (or not lower than) the threshold value T2 (T2 is a real number), the target cell is determined as Pseudo base station cell.

According to an embodiment of the present invention, for criterion two, for example, the weights of the parameter information IE1, IE2, and IE3 included in the pseudo base station identification table are w1, w2, and w3, respectively. Compare the system information of the target cell with the parameter information in the pseudo base station identification table. If the target cell system information includes IE1, IE2, and IE3, the cumulative weight ws is (w1 + w2 + w3); if the target cell system information includes For IE1 and IE3, but IE2 is not included, the cumulative weight and ws are (w1 + w3). Then, the accumulated weight and ws are compared with the threshold value T1, and when the accumulated weight and ws are greater than (or not less than) the threshold value T1, it is determined that the target cell is a pseudo base station cell. Among them, the weight value and the threshold value T1 may be real numbers, and may be set by a manufacturer, service provider, etc. according to actual design requirements. Please note that the descriptions of the above embodiments are merely examples, and the present invention is not limited thereto.

According to an embodiment of the present invention, for criterion three, for example, the pseudo base station identification table includes parameter information IE1, IE2, IE1 and IE2. The range and weight of the parameter information can be exemplified in Table 1 below. When the values of IE1 and IE2 included in the information are compared with the information of the pseudo base station identification table, it is determined that the corresponding weights of IE1 and IE2 are w11 and w22, respectively, and the cumulative weight and ws are (w11 + w22). Then, the accumulated weight and ws are compared with the threshold value T2, and when the accumulated weight and ws are greater than (or not less than) the threshold value T2, it is determined that the target cell is a pseudo base station cell. Among them, the weight value and the threshold value T2 may be real numbers, and may be set by a manufacturer, service provider, etc. according to actual design requirements. Please note that the descriptions of the above embodiments are merely examples, and the present invention is not limited thereto.

Please note that the pre-judgment flow chart of the pseudo base station cell shown in Figure 2 is only an example. If the execution results are roughly the same, there is no need to strictly follow the steps shown in Figure 2 in sequence. The field has general knowledge Those who do not depart from the spirit of the invention of the present invention may split, merge, or omit and exchange some of the steps in the second figure. limit.

Taking a 2G pseudo base station as an example, after a pseudo base station sends a junk short message to a mobile terminal, it usually forces the mobile terminal to leave the pseudo base station cell by the following two methods: a) changing the LAC of the serving cell to force the mobile terminal to perform a location update, The pseudo base station will reject the mobile terminal's current location update request, so that the mobile terminal triggers the network search action and leaves the pseudo base station cell; or b) under the condition that the signal quality of the cell is normal, the paging channel (PCH) ) Sends a large number of bad blocks, causing the mobile terminal to trigger cell reselection, thereby leaving the pseudo base station cell.

Therefore, the present invention further provides a method for identifying a pseudo base station cell in combination with various embodiments of the present invention. Please refer to FIG. 3. FIG. 3 is a flowchart of identifying a pseudo base station cell according to an embodiment of the present invention. After the mobile terminal resides in the target cell in step 410, it is determined in step 420: whether a short message (T1> 0) issued by the network is received within T1 time after the mobile terminal resides in the target cell. If not, the mobile terminal determines the target cell (ie, the current serving cell) as a non-pseudo base station cell in step 460, and adds the serving cell to the real cell list. If the mobile terminal decides to receive the short message within T1 time after staying in the target cell in step 420, it is further judged in step 430: whether the location update is triggered again and the network refuses within T2 time after receiving the short message. Drop the location update request. If yes, go to step 450, confirm the serving cell as a pseudo base station cell, add the information of the serving cell to the pseudo base station cell list, and trigger the cell reselection or network search process, so that The mobile terminal leaves the pseudo base station cell. If the judgment result is no in step 430 (that is, the mobile terminal receives a short message The location update is not triggered within the next T2 time, or the mobile terminal has triggered the location update within T2 after receiving the short message but the network corresponding to the serving cell has not rejected the location update request), then the mobile terminal in step 440 Further judge: if the signal quality of the serving cell is not lower than the predetermined level, whether a large number of bad blocks are received on the control channel within T3 time after receiving the short message. If yes, go to step 450; otherwise, go to step 460. According to various embodiments of the present invention, the control channel may include a PCH, a Broadcasting Control Channel (BCCH), a Common Control Channel (CCCH), and the like. In step 450, the mobile terminal confirms the serving cell as a pseudo base station cell, adds the information of the serving cell to the pseudo base station cell list to update the pseudo base station cell list, and triggers a cell reselection or network search process, so that The mobile terminal leaves the pseudo base station cell. In step 460, the mobile terminal confirms the serving cell as a non-pseudo base station cell, and adds the serving cell to the real cell list to update the real cell list.

Please note that in the judgment of step 430 of this embodiment, the reason for the network to reject the location update request may include # 12 Location Area not allowed, # 13 Roaming not allowed in this location area Roaming is not allowed in the area), # 15 No Suitable Cells In Location Area, etc. It is worth noting that due to the changeability of the pseudo base station message, the reasons for rejecting the location update mentioned in the present invention are not limited to the three mentioned here.

In addition, in the judgment of step 440 in the above embodiment, the monitoring of the signal quality of the serving cell may adopt various implementation methods in the art. For example, the signal quality may be a received signal strength indicator (Received Signal It is characterized by parameters such as Strength Indicator (RSSI), Received Signal Code Power (RSCP), Reference Signal Received Power (RSRP), and Reference Signal Received Quality (RSRQ). Note that this is just an example. Any parameter that can be used by a person with ordinary knowledge in the art to characterize the signal quality of the serving cell can be used here, and the invention is not limited thereto. In step 440, when the signal quality of the serving cell is not lower than a predetermined level, the normal serving cell can guarantee the normal signal transmission and reception with the mobile terminal, and the pseudo base station cell will pass through with the normal signal quality. Send a large number of bad blocks to the mobile terminal to force the mobile terminal to reselect and leave the pseudo base station cell. Therefore, you can determine whether the serving cell is a pseudo base by determining whether a serving cell with normal signal quality sends a large number of bad blocks to the mobile terminal.台 区。 Taiwan community. According to various embodiments of the present invention, the predetermined level of signal quality herein may be a preset signal quality experience value, or an average value of signal quality over a period of time, and the present invention is not limited thereto. In addition, according to various embodiments of the present invention, in the case that the serving cell has normal signal quality in step 440, the number of bad blocks received within a predetermined time T3 after receiving the short message and a threshold number K can be performed. It is determined by comparison, and the threshold number K is a natural number, which can be determined according to empirical values or actual implementation methods and / or design requirements. For example, when the number of bad blocks received by the mobile terminal on the control channel within T3 after receiving the short message is greater than or equal to K, it is decided to receive a large number of bad blocks in step 440.

Please note that the flowchart of identifying the pseudo base station cell shown in Figure 3 is only an example. If the execution results are roughly the same, you do not need to strictly follow Figure 3. The multiple steps shown are performed sequentially. Those with ordinary knowledge in the art can provide multiple steps in FIG. 3 by splitting, merging, or omitting and reversing some steps without departing from the spirit of the invention. The present invention is not limited to this.

FIG. 4 is a schematic diagram of a pseudo base station identification table according to an embodiment of the present invention. The parameters in the pseudo base station identification table may include some or all of the IEs in the cell system information. As shown in Figure 4, the cell system information IE in the pseudo base station identification table may include: MSC Release (CR) (version number supported by the mobile switching center), T3212 timeout value (T3212 timer duration), RADIO-LINK -TIMEOUT (radio link timeout), DTX indicator (discontinuous transmission indication), Power control indicator (PWRC), power call (emergency call), CELL_RESELECT_OFFSET (cell reselection offset), System Information 2ter Indicator, GPRS Indicator, SI2quater Indicator, SILKquat Indicator, RXLEV-ACCESS-MIN (Minimum Access Received Signal Level), and MS-TXPWR-MAX-CCH (Mobile Station Control channel maximum transmit power). The value range of the parameters in the pseudo base station identification table can be obtained according to the current cell system information of the pseudo base station. Please note that the pseudo base station identification table here is only for illustration. Due to the configurability of the system parameters of the pseudo base station, the pseudo base station identification table mentioned in the present invention is not limited to the content mentioned. The content of this table depends on the specific environment and practical application.

Please note that the multiple steps of the method for pre-judging and identifying the pseudo base station cell shown in Figs. 2 to 3 according to various embodiments of the present invention can be performed through a communication device. The processor 130 included in the device 100 is executed. However, according to another embodiment of the present invention, according to various embodiments of the present invention, the multiple steps of the method for predicting and identifying a pseudo base station cell shown in FIG. 2 to FIG. 3 may be performed by an external device external to the communication device 100. Processor to execute. According to another embodiment of the present invention, the present application further provides a device for identifying a pseudo base station cell, as shown in FIG. 5. FIG. 5 is a schematic diagram of a pseudo base station cell identification device 500 according to an embodiment of the present invention. As shown in FIG. 5, the identification device 500 of the pseudo base station cell may be externally connected to the communication device 100 through an interface of the communication device 100. According to an embodiment of the present invention, a pseudo base station cell identification device 500 includes a processor 510, and multiple pre-judgment and identification methods of the pseudo base station cell shown in FIG. 2 to FIG. 3 according to various embodiments of the present invention. The steps can be executed by the processor 510 and the memory device 140 of the communication device 100 is used to store relevant information (for example, a pseudo base station cell list, a real cell list, a pseudo base station identification table, etc.). According to another embodiment of the present invention, the identification device 500 of the pseudo base station cell may further include a memory device 520 coupled to the processor 510. According to various embodiments of the present invention, the multiple steps of the method for predicting and identifying a pseudo base station cell shown in FIG. 2 to FIG. 3 may be performed by the processor 510 included in the pseudo base station cell identification device 500. The memory device 520 is used to store relevant information (for example, a pseudo base station cell list, a real cell list, a pseudo base station identification table, etc.). Please note that the above is only an example, and the present invention is not limited thereto. For the specific operation steps of the pseudo base station cell identification device 500 for performing pseudo base station cell identification, please refer to the detailed description of FIG. 2 to FIG. 4 above. For the sake of brevity, it will not be repeated here.

The method and device for identifying a pseudo base station cell according to various embodiments of the present invention can be applied to search of a communication device, cell reselection, network Controlled cell change and switching between different communication technologies. The network-controlled cell change can be based on, for example, a Cell Change Order (CCO) message, a redirection message, etc. sent by the network. Cell change operation performed. Please note that this is only used for illustration, and the present invention is not limited thereto.

By using the method and device for identifying a pseudo base station cell according to the present invention, it is possible to effectively prevent and reduce the occurrence of mobile terminals staying in pseudo base stations, greatly reducing the probability of mobile terminals receiving fraudulent short messages and advertising promotion, and to improve users It's especially important in terms of experience.

Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person with ordinary knowledge in the field can make some changes and retouching without departing from the spirit and scope of the present invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

Claims (16)

A method for identifying a pseudo base station cell is applicable to a communication device. The method for identifying a pseudo base station cell includes: receiving system information of a target cell; and determining whether the target cell is based on the system information of the target cell received. Included in a real cell list; when the target cell is included in the real cell list, the received system information of the target cell is compared with the system information corresponding to the target cell in the real cell list to generate A first comparison result; and determining whether the target cell is a pseudo base station cell according to the first comparison result, wherein the step of determining whether the target cell is a pseudo base station cell according to the first comparison result includes: When the first comparison result indicates that the difference between the received system information of the target cell and the system information corresponding to the target cell in the real cell list is greater than or equal to a first threshold value, it is determined that the target cell is a pseudo Base station community. The method for identifying a pseudo base station cell according to item 1 of the scope of patent application, wherein the step of determining whether the target cell is a pseudo base station cell according to the first comparison result includes: determining the pseudo base station cell The target cell information is added to a pseudo base station list. The method for identifying a pseudo base station cell according to item 1 of the scope of patent application, further comprising: judging whether the target cell is based on the system information of the target cell received. No is included in a pseudo base station cell list; when the target cell is included in the pseudo base station cell list, it is determined that the target cell is the pseudo base station cell. The method for identifying a pseudo base station cell according to item 1 of the patent application scope, further comprising: when the target cell is not included in the real cell list, the system information of the target cell and a pseudo base station identification will be received The information in the table is compared to generate a second comparison result; and whether the target cell is the pseudo base station cell is determined according to the second comparison result. The method for identifying a pseudo base station cell according to item 4 of the scope of patent application, wherein the step of determining whether the target cell is the pseudo base station cell according to the second comparison result includes: when the second comparison result indicates that the When the number of the same parameters of the system information of the target cell and the information in the pseudo base station identification table is greater than or equal to a second threshold, the target cell is determined to be the pseudo base station cell; or the target cell will be received Some or all parameters of the system information are compared with corresponding corresponding part or all parameters in the pseudo base station identification table, and one of the system information of the target cell and one of the pseudo base station identification tables appearing together is accumulated. The weight corresponding to one or more parameters, when the cumulative weight sum is greater than or equal to a third threshold, the target cell is determined to be the pseudo base station cell; or a part of the system information of the target cell is received or All parameters and The corresponding part or all parameters in the pseudo base station identification table are compared, and according to the values of the part or all parameters of the target cell, the corresponding part or all parameters in the pseudo base station identification table are preset. One of the corresponding value ranges in the value range determines the corresponding weight, and accumulates the weight corresponding to some or all of the parameters of the target cell. When the sum of the accumulated weights is greater than or equal to a fourth threshold, the value is determined. The target cell is the pseudo base station cell. The method for identifying a pseudo base station cell according to item 4 of the scope of patent application, wherein the pseudo base station identification table includes part or all of the information units in the system information of the cell, and the value range of one or all of the part or all of the information units is based on the pseudo The system information of the base station cell is different from that of the normal base station cell. The method for identifying a pseudo base station cell according to item 3 of the scope of patent application, wherein the cell information in the pseudo base station cell list has a valid time. The method for identifying a pseudo base station cell according to item 1 of the scope of patent application, wherein the cell information in the real cell list has a valid time. A method for identifying a pseudo base station cell is applicable to a communication device. The method for identifying a pseudo base station cell includes: receiving system information of a target cell; and receiving the target based on the system information of the target cell received Comparing the system information of the cell with the information in a pseudo base station identification table to generate a first comparison result; and determining whether the target cell is a pseudo base station cell according to the first comparison result, The pseudo base station identification table includes some or all of the information units in the cell system information, and a value range of the part or all of the information units is different from that of a normal base station cell according to the system information of a pseudo base station cell. The main characteristics are formulated. The method for identifying a pseudo base station cell according to item 9 of the scope of patent application, wherein the step of determining whether the target cell is a pseudo base station cell according to the first comparison result includes: when the first comparison result indicates that the When the number of the same parameters of the system information of the target cell and the information in the pseudo base station identification table is greater than or equal to a second threshold, the target cell is determined to be the pseudo base station cell; or the target cell will be received Some or all parameters of the system information are compared with corresponding corresponding part or all parameters in the pseudo base station identification table, and one of the system information of the target cell and one of the pseudo base station identification tables appearing together is accumulated. The weight corresponding to one or more parameters, when the cumulative weight sum is greater than or equal to a third threshold, the target cell is determined to be the pseudo base station cell; or a part of the system information of the target cell is received or All parameters are compared with corresponding ones or all parameters in the pseudo base station identification table, according to the part or all of the target cell The value of the parameter corresponds to one of the value ranges in the preset value range of the part or all of the parameters corresponding to the pseudo base station identification table to determine the corresponding weight and accumulate the value corresponding to the target cell. The weight of some or all parameters, when the cumulative weight sum is greater than or equal to a fourth threshold, it is determined that the target cell is the pseudo-base Platform community. The method for identifying a pseudo base station cell according to item 9 of the scope of patent application, further comprising: judging whether the target cell is included in a real cell list according to the system information of the target cell received; when the target cell includes While in the real cell list, comparing the received system information of the target cell with the system information corresponding to the target cell in the real cell list to generate a second comparison result; and according to the second comparison result To determine whether the target cell is the pseudo base station cell. The method for identifying a pseudo base station cell according to item 11 of the scope of patent application, wherein the cell information in the real cell list has a valid time. The method for identifying a pseudo base station cell according to item 11 of the scope of patent application, wherein the step of determining whether the target cell is a pseudo base station cell according to the second comparison result includes: when the second comparison result indicates that it is received When the difference between the system information of the target cell and the system information corresponding to the target cell in the real cell list is greater than or equal to a first threshold value, it is determined that the target cell is the pseudo base station cell. The method for identifying a pseudo base station cell according to item 9 of the scope of patent application, further comprising: judging whether the target cell is included in a pseudo base station cell list according to the received system information of the target cell; when the target cell is When included in the pseudo base station cell list, the target is determined The target cell is the pseudo base station cell. The method for identifying a pseudo base station cell according to item 13 of the scope of patent application, wherein the cell information in the pseudo base station cell list has a valid time. The method for identifying a pseudo base station cell according to item 9 of the scope of patent application, wherein the information of the pseudo base station cell list is updated according to the information of the target cell identified as the pseudo base station cell.