CN104168568B - A kind of mobile terminal and its method for carrying out cell identity certification - Google Patents

Abstract

The present invention provides methods and mobile terminal that a kind of mobile terminal carries out cell identity certification；The method includes：Mobile terminal preserves cell information；The cell information includes the data record for the cell that the mobile terminal once accessed；The data record of one cell includes the identification information of the cell and the identification information of the neighboring community of the cell；Mobile terminal is when needing re-selecting cell, in the data record of current persistent district, respectively matches the identification information of each Target cell with the identification information of neighboring community；The Target cell of successful match is only reported to base station.The present invention can simply and effectively identify pseudo-base station when terminal switches.

Description

A mobile terminal and method for cell identity authentication thereof

technical field

The invention relates to the communication field, in particular to a mobile terminal and a method for performing cell identity authentication thereof.

Background technique

In a mobile communication system, a base station is a network infrastructure deployed by a telecom network operator with legal operating qualifications. It provides wireless network communication services for user terminals by providing wireless signal coverage. However, in order to obtain user information, a large number of pseudo base stations pretending to be mobile communication networks appear in the network, which seriously hinders the normal communication of users. Recently, a pseudo-base station system of spam messages that can simulate any number of callers and send any content has been widely discovered, causing serious social harm.

Even if spam text messages are harmless, the existence of "pseudo base stations" will also bring harm to the use of mobile phones. When the "pseudo base stations" are running, the user's mobile phone signal will be forced to connect to the device, and the services provided by the operator cannot be used normally. Generally, it will be temporarily disconnected from the network for 8 to 12 seconds before returning to normal, and some mobile phone users must switch on and off to reconnect to the network. In addition, the "pseudo base station" will also cause mobile phone users to frequently update their location, which will make the wireless network resources in the area tense and cause network congestion, which will affect the normal communication of users.

As the name implies, a fake base station is a fake base station, usually by increasing the signal strength to induce the mobile terminal within its coverage to choose and stay; by setting the location area parameters, the identification request forces the terminal to initiate a location area update, and obtain the user's permanent identity IMSI ( International Mobile Subscriber Identification Number, International Mobile Subscriber Identification Number) and terminal identification IMEI (International Mobile Equipment Identity, International Mobile Equipment Identity Code) information. In addition to the above-mentioned features, the new pseudo-base station can also force users to receive SMS messages through counterfeit signaling, which seriously damages the user's application experience.

The fake base station uses the operator's GSM (Global System for Mobile communication, Global System for Mobile Communications) frequency band, adopts higher transmission power to attract user terminals to stay, and then launches an attack. The pseudo base station sets the same network number as the operator (such as network number 460-00), but sets a different location area code LAC. When the terminal receives the system broadcast message from the pseudo base station, it mistakenly thinks that it has entered a new location area LAC, and initiates a location update process. At this time, the pseudo base station obtains IMSI and IMEI information from the terminal through two identification requests successively, and then returns a location update acceptance message to the terminal to confirm that the location update is successful. After that, the pseudo-base station can send short messages of any number, content, and calling number to the terminal, so as to achieve the purpose of spamming advertisements and false propaganda. In order to prevent the terminal from staying on the pseudo base station for a long time and cause user alertness, the pseudo base station changes location area codes periodically. After the location area is changed, the terminal will initiate a location update again. At this time, for the terminal that has been camped on, the pseudo base station returns a location update rejection message, kicks the terminal out, and forces the terminal to reselect to the normal network of the operator.

The fundamental reason why fake base stations can launch the above-mentioned attacks on users is that during the communication process between the base station and the user terminal, the terminal cannot detect whether the network identity is legal or not, and cannot judge whether the received signaling information is sent from a legitimate base station. The authentication process supported by the GSM system can only complete the one-way authentication of the network to the terminal, and the terminal does not verify the legitimacy of the base station and the authenticity of the identity. At the same time, the GSM system does not use an integrity protection mechanism to protect the air interface signaling, and the terminal cannot authenticate the authenticity and integrity of the signaling sent by the network. In this way, as long as the standard communication signaling sent by the network is received, the terminal will process and respond without distinguishing the authenticity of the signaling, and will also process the forged or tampered signaling. False base stations use the security loopholes of "one-way authentication" and "no integrity protection for air interface messages" in the GSM system to attack users.

For fake base station attacks, the existing solutions mainly include the following categories:

(1) The system is required to support the terminal's authentication of the network and the air interface signaling integrity protection function

In the 3G/LTE system, through the upgrade of the USIM (Universal Subscriber Identity Module) card, 3G/LTE system terminal, access network, and core network equipment, as well as the formulation of new standards and protocols, Realize the two-way authentication between the network and the terminal and realize the integrity protection of the signaling message.

In the 3G/LTE system, the authentication of the terminal to the network is realized by verifying the authentication token AUTN issued by the core network through the USIM. Based on the user USIM card and the shared root key K pre-stored in the home network HLR (Home Location Register)/HSS (Home Subscriber Server, Home Subscriber Server), HLR/HSS calculates and generates AUTN, and passes through the legal core network And the base station equipment sends the terminal. On the terminal side, the USIM generates AUTN based on the same algorithm as K, and compares it with the received AUTN to judge the legitimacy of the network device.

While authenticating, the 3G/LTE system will also negotiate integrity protection keys between the terminal and the network to protect transmitted messages and prevent fake base stations from spoofing signaling messages.

However, this solution has been well applied in the 3G/LTE system and can effectively solve the problem of pseudo-base stations. However, the GSM system does not support the above two functions when it is designed, so it cannot be simply configured or upgraded through the system. To solve it, it is necessary to transform the complete set of equipment of the GSM system SIM card, terminal, access network and core network, which is complicated and costly.

(2) Install interception software on the terminal side to identify spam messages sent by fake base stations

Study the intelligent identification model of "pseudo base station spam text messages", identify fraudulent text messages and spam messages sent by "pseudo base stations", intercept and prompt users, help users identify illegal information content, and prevent users from being harmed by "pseudo base station" illegal information.

However, in this solution, after the user terminal accesses the pseudo base station and receives the information sent by the pseudo base station, it analyzes the text messages according to the identification model of spam text messages, intercepts and prompts the user to avoid being deceived. First of all, the recognition rate of spam messages is related to the maturity of the model, and it is currently difficult to achieve 100% interception; secondly, not all spam messages are sent by fake base stations. This solution only partially recognizes spam messages and cannot accurately identify fake base stations. Finally, even if the spam messages sent by the fake base station are intercepted, the fake base station has obtained the user's permanent identifier IMSI and terminal identifier IMEI information during this process, which can be used to eavesdrop on and track the user's location, posing a threat to user privacy.

(3) Carriers analyze, check and manage the live network through signaling detection

One is to use the signaling monitoring system and network management system to conduct statistical analysis on the abnormal location update of the cell, and determine the situation of the suspected pseudo-base station sending short messages and the location area of the pseudo-base station on the existing network. Combined with user complaints, go to the scene to capture and confirm such spam messages.

The second is to go to the pseudo base station to detect the BCCH broadcast frequency of the pseudo base station on site, delete the broadcast frequency of the pseudo base station from the BA list list of the live network or adopt the dual BA technology of the manufacturer (some manufacturers support, currently the pseudo base station only has 900M frequency point, you can force the user to select only the 1800M cell when reselecting the cell), which can temporarily solve the interference problem caused by the pseudo base station.

However, since most of the pseudo base stations are mobile, it is difficult for operators to capture the information of pseudo base stations in real time; at the same time, deleting the broadcast frequency points of pseudo base stations is only a temporary solution, because pseudo base stations can automatically detect frequency points in adjacent areas, and Frequency and LAC can be modified at any time.

To sum up, there is no simple and reliable solution to identify pseudo base stations at present.

Contents of the invention

The technical problem to be solved by the present invention is how to identify the false base station simply and effectively when the terminal is switched.

In order to solve the above problems, the present invention provides a method for a mobile terminal to perform cell identity authentication, including:

The mobile terminal saves the cell information; the cell information includes the data record of the cell that the mobile terminal has accessed; the data record of a cell includes the identification information of the cell and the identification information of the adjacent cell of the cell;

When the mobile terminal needs to reselect a cell, it will match the identification information of each target cell with the identification information of adjacent cells in the data record of the current cell, and report only the successfully matched target cells to the base station.

Optionally, the mobile terminal uses a user terminal side cell information database to save the cell information;

The identification information includes two parts, a location area code LAC and a cell identifier CID.

Optionally, the method also includes:

When the mobile terminal accesses a cell, the data record of the cell in the user terminal side cell information database is set as the first piece of data.

Optionally, the method also includes:

After the mobile terminal accesses a cell, if the data record of the cell cannot be found in the cell information, it submits the identification information of the cell to the operator through an independent dedicated control channel, and sends the identification information of the cell to the operator. , and the identification information of the neighbor cell of the cell returned by the operator is stored in the cell information as the data record of the cell.

Optionally, when the mobile terminal needs to reselect a cell, it also includes:

The mobile terminal obtains the identity of each target cell through a broadcast control channel.

The present invention also provides a mobile terminal, including:

User community information management module and user switching judgment analysis module;

The user cell information management module is used to save cell information; the cell information includes the data records of the cells that the mobile terminal has accessed; the data records of a cell include the identification information of the cell and the adjacent cells of the cell identifying information;

The user handover judgment analysis module is used to match the identification information of each target cell with the identification information of adjacent cells in the data record of the cell where the mobile terminal currently resides when the mobile terminal needs to reselect a cell; The successfully matched target cell is reported to the base station.

Optionally, the user cell information management module uses a user terminal side cell information database to save the cell information;

The identification information includes two parts, a location area code LAC and a cell identifier CID.

Optionally, the mobile terminal also includes:

The user cell information management module is further configured to set the data record of the cell in the user terminal side cell information database as the first piece of data when the mobile terminal accesses a cell.

Optionally, the user cell information management module is further configured to submit the data record of the cell through an independent dedicated control channel if the mobile terminal accesses a cell and cannot find the data record of the cell in the cell information. The identification information of the cell is given to the operator, and the identification information of the cell and the identification information of the adjacent cells of the cell returned by the operator are stored in the cell information as the data record of the cell.

Optionally, the user handover judging and analyzing module is further configured to obtain the identity of each target cell through a broadcast control channel when the mobile terminal needs to reselect a cell.

The present invention adopts the method of adding real-time judgment in advance to directly cut off the switching of the terminal to the fake base station, eliminates the reception of spam short messages, prevents the user's IMSI and IMEI from being stolen, and solves the security problem of the fake base station from the source.

Description of drawings

FIG. 1 is a schematic flow diagram of maintaining a user terminal side cell information database in Embodiment 1;

FIG. 2 is a schematic flow chart of handover judgment in Embodiment 1;

Fig. 3 is a schematic diagram of the deployment position in the second embodiment.

Detailed ways

The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

It should be noted that, if there is no conflict, the embodiments of the present invention and various features in the embodiments can be combined with each other, and all are within the protection scope of the present invention. In addition, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

Embodiment 1. A method for a mobile terminal to perform cell identity authentication, comprising:

The mobile terminal saves the cell information; the cell information includes the data record of the cell that the mobile terminal has accessed; the data record of a cell includes the identification information of the cell and the identification information of the adjacent cell of the cell;

When the mobile terminal needs to reselect a cell, it will match the identification information of each target cell with the identification information of adjacent cells in the data record of the current cell, and report only the successfully matched target cells to the base station.

This embodiment is a cell identity authentication scheme based on the independent judgment of the mobile terminal. The method of adding real-time judgment in advance directly cuts off the possibility of the mobile terminal switching to the fake base station, fundamentally eliminates the reception of spam messages, and prevents The user's IMSI and IMEI are stolen, which solves the security problem of the fake base station from the source; this embodiment is reliable and easy to implement, and is conducive to quick implementation, quick deployment, and quick results.

In this embodiment, when the identification information of the target cell matches the identification information of at least one neighboring cell of the cell currently camped on, it means that the target cell is a legal neighboring cell of the cell currently camped on.

Generally, during the process of network access and movement of a mobile terminal, there are generally the following three states:

(1) Network selection: select the home network HPLMN (Home Public Land Mobile Network, local public land mobile network)/visited network VPLMN (Visited Public Land Mobile Network, visiting public land mobile network):

①Start network selection when starting up or entering the coverage area;

②The user manually starts the network selection process;

③ Periodically look for the home network during domestic roaming.

(2) Community selection; a suitable community needs to meet the following conditions at the same time:

The cell belongs to the selected network;

The area is not "banned";

The cell is not in a prohibited domestic roaming location area:

The wireless path loss between MS (mobile station, ie mobile terminal) and BTS (base transceiver station) is below the threshold set by the network, that is, the parameter C1>0.

(3) Cell reselection; the circumstances that cause cell reselection are:

The wireless path loss of the cell currently camped on is too large (C1<=0);

The downlink failure of the cell currently camped on (DSC<=0);

The current residential area is banned;

According to the cell reselection parameter C2, there is a better cell than the current camping cell in the same location area. (In the prior art, the cell reselection parameter C2 is formed based on the parameter C1 and adding some artificial bias parameters, adding artificial influence is to encourage the mobile station to preferentially enter some cells or prevent the mobile station from entering some cells , under normal circumstances, these means are used to balance the traffic in the network);

The number of random access times reaches the maximum number of retries broadcast on the BCCH, but still fails to access the cell where it is currently camping.

The pseudo base station utilizes the influence of the cell reselection parameter C2 on cell reselection, and by setting a value of C2 much higher than the current and other surrounding cells, it can attract surrounding mobile terminals to attach. In this case, the reselection of the cell only needs to judge the C2 parameter of different cells, and the C2 parameter of the higher cell will be handed over. If the identity and legitimacy of the candidate target cell can be identified during this type of handover, it can effectively identify whether the fake base station is the legitimate base station of the operator.

Operators have abundant mobile network resources, which can record the names, geographic locations, adjacent cells and other information of all base stations/cells. If they can be fully utilized during handover, mobile terminals can query these resources in time and compare and analyze them. It is judged whether it is a pseudo base station in a short time.

In this embodiment, the operator can rely on its own complete base station cell information resources to provide the mobile terminal with complete and accurate information about the legal neighboring cell of the cell it is in. Judging and not reporting to the base station the target cell that is not a legal neighboring cell, so that the handover of the illegal base station can be actively rejected.

In an implementation manner of this embodiment, the mobile terminal may use a user terminal side cell information database to store the cell information. In other implementation manners, it may also be stored in other ways.

The user terminal side cell information database can be as shown in Table 1, and the identification information includes two parts, LAC and CID (CellIdentity, cell identification), and the data records of each cell stored in the user terminal side cell information database can also include each Access times of the cell.

Table 1. User terminal side cell information database

Of course, the cell information contained in the user terminal side cell information database may not be limited to the above content, and the data records of the cells that the mobile terminal has accessed constitute the user terminal side cell information database.

In this embodiment, a special database can also be set up on the operator side to record the attributes (identification information, geographic location, etc.) of the operator's complete base station cell and the identification information of its adjacent cells, as shown in Table 2.

Table 2. Operator-side cell information database

Similarly, the cell information contained in the operator-side cell information database may not be limited to the above contents, and the attributes of the cells may not be limited to the above contents. The attributes of the cells owned by the operator and the identification information of adjacent cells constitute a complete operator Side cell information database.

In an alternative of this embodiment, the method may also include:

When the mobile terminal accesses a cell, the data record of the cell in the user terminal side cell information database is set as the first piece of data.

This alternative scheme can optimize the query method, improve the query efficiency, and keep the cell information of the currently resident cell always at the forefront of Table 2 (the first piece of data).

In addition, due to the limitation of the storage space on the user terminal side, and in order to optimize the processing efficiency as much as possible, the user can customize and clear the data records whose access times are less than the predetermined threshold (except the current cell) according to the predetermined period.

In an implementation manner of this embodiment, the method may further include:

After the mobile terminal accesses a cell, if it cannot find the data record of the cell in the cell information, it submits the identification information of the cell to the operator, and returns the identification information of the cell and the operator The identification information of the neighboring cells of the cell is stored in the cell information as the data record of the cell.

The mobile terminal may, but is not limited to, submit the identification information of the cell to the operator through an SDCCH (Stand-Alone Dedicated Control Channel, independent dedicated control channel).

In an implementation manner of this embodiment, when the mobile terminal needs to reselect a cell, the method may further include: acquiring an identity of each target cell through a BCCH (Broadcast Control Channel, broadcast control channel).

In an example of this embodiment, the cell information maintenance process is shown in Figure 1, including:

101. The mobile terminal accesses the normal network;

102. The mobile terminal obtains the identification information (LAC+CID) of the currently accessed cell (that is, the cell currently camped on);

103. The mobile terminal inquires whether there is a data record of the currently resident cell in the local Table 1; if it exists, proceed to step 104; if not, proceed to step 105;

104. Add 1 to the number of access times in the data record of the cell currently residing in, and advance the data record to the front of Table 1; end.

105. If it does not exist, submit the identification information of the currently camped cell to the operator side;

106. The operator side queries Table 2 for the identification information of the neighboring cell corresponding to the cell where the cell currently resides;

107. Return the query result to the mobile terminal; the mobile terminal saves it and the identification information of the cell it currently resides in as a complete data record in Table 1, wherein the number of times of access is "0"; return to step 104.

In this example, the mobile terminal handover judgment process is shown in Figure 2, including:

201. Continuously monitor the communication module of the mobile terminal, and perform step 202 before reporting to the base station after monitoring a target cell available for handover;

202. Read the identification information (LAC+CID) of the target cell;

203. Inquire whether the target cell is an adjacent cell of the cell currently camped in in Table 1 locally of the mobile terminal; if yes, proceed to step 204; if not, proceed to step 205;

204. Determine that the target cell is legal, and report to the base station; end.

205. It is determined that the target cell is illegal, and the target cell is not allowed to be reported to the base station; end.

Embodiment 2. A mobile terminal, comprising:

A user cell information management module and a user switching judgment and analysis module.

The user cell information management module is used to save cell information; the cell information includes the data records of the cells that the mobile terminal has accessed; the data records of a cell include the identification information of the cell and the adjacent cells of the cell identifying information;

The user handover judgment analysis module is used to match the identification information of each target cell with the identification information of adjacent cells in the data record of the cell where the mobile terminal currently resides when the mobile terminal needs to reselect a cell; The successfully matched target cell is reported to the base station.

In an implementation manner of this embodiment, the user cell information management module uses a user terminal side cell information database to store the cell information; the identification information includes two parts, a location area code LAC and a cell identifier CID.

In this embodiment, the user cell information management module maintains the user terminal side cell information database, and the specific working process is as follows:

301. Before entering the range of the fake base station, the mobile terminal accesses a normal network, and can obtain the identification information LAC+CID (for example, 1111) of the currently accessed cell through the BCCH channel.

302. Inquire locally on the mobile terminal whether the U1 column in the user terminal side cell information database contains the identification information "1111" of the cell. If included, go to step 303; if not included, go to step 304.

303. In the user terminal side cell information database, add 1 to the number of cell access times in the data record where the cell identifier "1111" is located, and insert this data record into the user terminal side cell information database in advance The front end (the first piece of data) in , this maintenance is over.

304. The module submits the parameter "1111" to the cell information management module on the operator side through the independent dedicated control channel (SDCCH). The cell information management module on the operator side queries the identification information of the adjacent cell corresponding to "1111" (such as "3333" and "4444") in the cell information database on the operator side according to the received parameters, and through the independent dedicated control The channel (SDCCH) returns to this module, and then fills "1111", "3333", and "4444" into the U1 and U3 columns of the cell information database on the user terminal side, and the number of cell accesses in the U2 column is initialized to 0. A complete data record of the currently resident cell is stored in the cell information database. Then add 1 to the number of access times in the data record where the cell identifier "1111" is located in the user terminal side cell information database, and insert this data record into the forefront of the user terminal side cell information database in advance (first pieces of data); this maintenance is over.

Usually, when the mobile terminal monitors the information of the surrounding adjacent cells and judges that one or several adjacent cells have a higher C2 parameter, it reports the monitoring result as a measurement report to the base station side, and the base station side starts the handover process. Select the target cell for handover; however, there may be a false base station in the target cell, which needs to be judged and analyzed before reporting. Therefore, the user handover judgment and analysis module of this embodiment continuously monitors the communication module on the user terminal side, and when a switchable target cell is detected and is about to be reported to the base station side, the potential target cell is judged and analyzed, and the judgment result is legal and will be used as Report the necessary conditions on the base station side. The working process is as follows:

401. Read the identification information LAC+CID of the target cell through the BCCH channel (for example, 5555).

402. Inquire whether "5555" is a neighboring cell of the cell currently camped on in Table 1 locally of the mobile terminal. If yes, go to step 403 , otherwise go to step 404 .

403. The target cell is legal, return the judgment result "1" to the communication module of the mobile terminal, and allow reporting to the base station;

404. The target cell is illegal, and the judgment result "0" is returned to the communication module of the mobile terminal, the target cell is not allowed to be reported to the base station, and the possibility of switching to the illegal target cell is eliminated.

If there are multiple target cells that can be handed over, all are judged according to the above steps.

When this embodiment is implemented, a module can also be added on the operator side:

The operator's cell information management module is used to maintain a complete operator's side cell information database, and is responsible for processing queries from user terminals and returning query results.

This module can be an independent new module, and can also be realized by using an existing module.

The working process is as follows:

501. According to the actual situation of the operator's base station and cell resources, maintain and update the content of the operator's side cell information database;

502. According to the cell LAC+CID provided by the user cell information management module on the mobile terminal, query the identification information of the corresponding adjacent cell in the operator-side cell information database, and pass the query result through the independent dedicated control channel (SDCCH ) returns to the user cell information management module.

In this embodiment, the recommended deployment position of the module is shown in FIG. 3 . NSS (Network Subsystem) is the core of the whole system. It plays the role of exchange, connection and management with GSM mobile users and communication between mobile users and other communication network users. Mainly responsible for completing call processing, communication management, mobility management, security management, user data and equipment management, billing record processing, signaling processing, etc. Including: MSC (Mobile Switching Center)/VLR (Visiting Location Register), EIR (Equipment Identification Register) and HLR (Home Location Register)/AUC (Authentication Center); MSC/VLR are also connected with PSTN (Public Telephone Network) , PDN (Public Data Network), and ISDN (Integrated Services Digital Network) are connected.

BSS (Base Station Subsystem) is the most direct basic component of the GSM system and the wireless cellular aspect. It is directly connected to the mobile station through the wireless interface and is responsible for the transmission and reception of wireless information, wireless resource management and power control; at the same time, it Connect with NSS to realize communication connection between mobile terminals or between mobile terminals and fixed network terminals, transmit system information and user information, etc.; of course, also realize intercommunication with OSS (Operation Support Subsystem). These include: BSC (Base Station Control Center) and BTS (Base Transceiver Station). The user cell information management module and the user switching judgment and analysis module can be deployed on the mobile terminal.

OSS completes mobile user management, mobile device management, and system operation and maintenance. These include: OMC (Operation and Maintenance Center) and NMC (Network Management Center); the operator's cell information management module can be deployed on the NMC.

Those skilled in the art can understand that all or part of the steps in the above method can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a magnetic disk or an optical disk, and the like. Optionally, all or part of the steps in the foregoing embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, or may be implemented in the form of software function modules. The present invention is not limited to any specific combination of hardware and software.

Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should all belong to the protection scope of the claims of the present invention.

Claims (10)

1. a kind of method that mobile terminal carries out cell identity certification, including：

Mobile terminal preserves cell information, and the cell information includes the data record for the cell that the mobile terminal once accessed, The data record of one cell includes the identification information of the cell and the identification information of the neighboring community of the cell；

Mobile terminal is when needing re-selecting cell, in the data record of current persistent district, respectively by the knowledge of each Target cell Other information is matched with the identification information of the neighboring community of the current persistent district of the mobile terminal；Only by the mesh of successful match Mark cell is reported to base station.

2. the method as described in claim 1, it is characterised in that：

The mobile terminal preserves the cell information using a subscriber terminal side cell information library；

The identification information includes Location Area Identity LAC and cell ID CID two parts.

3. method as claimed in claim 2, which is characterized in that further include：

When the mobile terminal accesses a cell, data of the cell in subscriber terminal side cell information library are remembered Record is set as the first data.

4. the method as described in claim 1, which is characterized in that further include：

The mobile terminal is after accessing a cell, if searching the data note less than the cell in the cell information Record, then submit the identification information of the cell to operator by Separate Dedicated Control Channel, and by the identification information of the cell, with And data record of the identification information of the neighboring community of the cell of operator's return as the cell, it is stored in the cell letter In breath.

5. the method as described in claim 1, which is characterized in that the mobile terminal further includes when needing re-selecting cell：

The mobile terminal obtains the mark of each Target cell by broadcast control channel.

6. a kind of mobile terminal, which is characterized in that including：

User's cell information management module and user's switching judging analysis module；

For user's cell information management module for preserving cell information, the cell information includes that the mobile terminal once accessed The data record of the data record for the cell crossed, a cell includes the identification information of the cell and the neighboring community of the cell Identification information；

User's switching judging analysis module is used for when the mobile terminal needs re-selecting cell, in current persistent district In data record, respectively by the knowledge of the identification information of each Target cell and the neighboring community of the current persistent district of the mobile terminal Other information is matched；The Target cell of successful match is only reported to base station.

7. mobile terminal as claimed in claim 6, it is characterised in that：

User's cell information management module preserves the cell information using a subscriber terminal side cell information library；

The identification information includes Location Area Identity LAC and cell ID CID two parts.

8. mobile terminal as claimed in claim 7, which is characterized in that further include：

User's cell information management module is additionally operable to when the mobile terminal accesses a cell, by the cell in the user Data record in the cell information library of end side is set as the first data.

9. mobile terminal as claimed in claim 6, it is characterised in that：

User's cell information management module is additionally operable to after the mobile terminal accesses a cell, if in the cell The data record less than the cell is searched in information, then submits the identification information of the cell to fortune by Separate Dedicated Control Channel Quotient is sought, and the identification information of the neighboring community for the cell that the identification information of the cell and operator are returned is small as this The data record in area is stored in the cell information.

10. mobile terminal as claimed in claim 6, it is characterised in that：

User's switching judging analysis module is additionally operable to, when the mobile terminal needs re-selecting cell, by Broadcasting Control believe Road obtains the mark of each Target cell.