CN100442889C - preferred roaming method - Google Patents

Abstract

The present invention relates to a preferred roaming method. The specific working process includes: after the user starts up, if the terminal cannot log in the network used before the shutdown or the network to which the user belongs, the terminal reads the preferred network list from a first file. Network information, and try to log in to a network in the network list in the order of the list. If it can, use the network. If not, judge whether all the current network signals have failed to log in. If not, then use the network according to the strength of the current network signal. The weak order tries to log in to the network. If it is, the login to the network fails, and the network is currently unavailable. The preferred roaming method can enable the user to preferentially log in to the network designated by the operator to perform preferred roaming during international roaming, bringing convenience and benefits to the user.

Description

preferred roaming method

technical field

The invention relates to a roaming method in wireless communication, in particular to a method for preferentially selecting the current communication network during roaming.

Background technique

When a user uses a mobile communication device, he often crosses the service area of the network access point and enters a service network in a different place. If there are multiple selectable networks in the area entered, the user's mobile phone can automatically search for the currently selectable networks and select one of the networks as the current communication network. However, the selection of the mobile phone is often random and may cause The use of the user brings inconvenience, such as the selected network signal and coverage are not good, resulting in the decline of the user's communication quality; the selected network charges are high, which increases the user's communication costs; the selected network is incompatible with the user in the field of data services and value-added services There is no agreement on roaming and cooperation in the home network of the home network, resulting in users being unable to use data services and value-added services when roaming. However, it is unrealistic and unnecessary for users to carefully understand the local network conditions before entering an area. Therefore, if a service that can give preference to roaming networks based on predetermined rules can be provided, It will definitely bring greater convenience to users.

Contents of the invention

The purpose of the present invention is to provide a method that enables users to preferentially log in to a network designated by an operator during international roaming by monitoring and processing key files in a SIM card.

According to international standards, the content of key files in the user's SIM card will affect the behavior of the user's mobile phone to select a network. Using the new file configuration and management scheme in the user's SIM card, the user's mobile phone can be controlled to select a roaming network according to predetermined rules.

When the SIM card is issued to the user, the file configuration and management scheme in the SIM card needs to be determined in advance. However, in the process of users' use, the predetermined rules may change. At this time, the operator can perform necessary updates to the file configuration and management scheme in the user's SIM card by means of Over the Air-OTA (Over the Air-OTA) remote file update, so that the changed rules can be applied to the user's account in a timely manner. SIM card. The OTA update process does not require user participation, is transparent to users, and does not disturb users.

The OTA system needs to be composed of an OTA server, an SMS gateway, and a SIM card that supports OTA functions. In addition to remote file updates, the functions realized through the OTA system also include dynamic download and deletion of SIM card service menus. The management of the card in the OTA method uses data short messages to realize the command and information interaction between the server and the SIM card, and on this basis to realize the remote update of the card file.

In order to achieve the above object, the present invention provides a method for optimal roaming. The specific work flow includes: when the user turns on the computer, the terminal issues an instruction to read a second file in the SIM card, and the second file stores the information used by the user before turning off the computer. network information; the SIM card obtains the mobile country code MCC and the mobile network code MNC data in the area information LAI data section stored in the second file; the SIM card obtains the MCC in the international mobile subscriber identity number IMSI stored in the third file data, the third file stores the network information to which the user belongs; compare whether the MCC in the LAI data segment of the second file is the same as the MCC in the IMSI of the third file, if they are the same, jump to step 509, if Different, execute the next step; the SIM card searches the first file, sequentially finds whether there is a record of network information, the MCC of this record is the same as the MCC content in the LAI data segment of the second file, if there is, go to the next step, if No, then perform step 509, store the network information in the preferred network list in the first file; obtain the MNC of the first record of matching; judge whether the MNC content in the LAI data segment in the MNC and the second file is identical , if the same, jump to step 509, if different, perform the next step; replace the MNC content in the LAI data segment of the second file with the MNC content; the SIM card executes the instruction to read the second file; the terminal tries Whether it is possible to log in to the network used before the shutdown, if yes, use the network, if not, the terminal tries to log in to the network to which the user belongs, if yes, then use the network, if not, the terminal reads from the first file Get the network information in the preferred network list; try to log in to a network in the preferred network list in the order of the list, if it can, use the network, if not, the terminal tries to log in to the available network according to the order of the current network signal strength , if you log in successfully, use this network. If not, judge whether all the networks with signals have failed to log in. If not, continue to try to log in to the network in order of the current network signal strength. If yes, log in to the network. Use the Internet.

Since the terminals used by some users will skip the operation of obtaining the preferred network list from the first file and attempting to log in during the process of logging in to the network, the present invention adds a monitoring process so that the LAI data segment in the second file The mobile country code (Mobile Country Code-MCC) and mobile network code (Mobile Network Code-MNC) read in the content are always consistent with the information in the first file, which can ensure that all terminals log in to the network In the process of obtaining the preferred network list from the first file and attempting to log in, the operation will not be skipped, thereby ensuring the realization of the preferred roaming.

Therefore, the present invention realizes that the user preferentially logs in to the network designated by the operator during international roaming by setting the content of the basic file in the SIM card and related functions. The entire process of the preferred roaming network is automatically completed under the control of the SIM card with the preferred roaming function, which is transparent to the user and does not affect the normal use of the user.

The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is a working flow chart of the present invention for logging into the terminal network.

Fig. 2 is a working flow chart of the present invention for restricting user modification authority.

Fig. 3 is a working flow chart of the terminal executing the instruction of reading the second file according to the present invention.

Fig. 4 is a flow chart of the present invention for preventing the network information in the first file from appearing in the fourth file.

Detailed ways

When the user roams internationally, there may be more than one roaming network to choose from. For a SIM card with the preferred roaming function, the basic file content and related functions on it have been set by the operator. Roam the network. In order to support the preferred roaming method, the operator should determine the preferred network list in advance and store it in the first file in the SIM card. For a SIM card that supports the preferred roaming function, the preferred network list can store at least 20 network information: MCC+MNC. The first file supports OTA remote file update, and the operator can remotely change and update the preferred network list in the SIM card of the user through the OTA server.

Please refer to Fig. 1, the concrete working process of the present invention comprises:

101) After the user turns on the terminal, the terminal will obtain the network information used by the user before the shutdown from a second file in the SIM card, and the network information includes MCC and MNC;

102) The terminal attempts to log in to the network used before the shutdown, if the login is successful, then use the network, otherwise, go to the next step;

103) The terminal acquires the network information to which the user belongs from a third file in the SIM card;

104) The terminal attempts to log in to the network to which the user belongs, and if the login is successful, then use the network, otherwise, go to the next step;

105) The terminal reads preferred network information from the first file in the SIM card, where the network information includes MCC and MNC;

106) The terminal tries to log in to the network according to the order of the list, if it successfully logs in to a network in the list, then use the network, otherwise, go to the next step;

107) judge whether all the networks in the network list fail, if not, return to the previous step, otherwise, execute the next step;

108) The terminal tries to log in to the available network according to the order of the current network signal strength, and if it successfully logs in, then use the network, otherwise, go to the next step;

109) Determine whether all the networks with signals fail to log in, if not, return to the previous step, if yes, it indicates that the network cannot be used currently.

In order to ensure the operator's control over the preferred network list, the setting process prohibits the user from modifying the first file, as shown in Figure 2. The workflow for restricting the user's modification authority is as follows:

201) The terminal sends an update instruction to the SIM card of the user;

202) Determine whether the instruction is an instruction to update the first file, if yes, directly jump to step 204, if not, execute the next step;

203) The SIM card executes the update instruction;

204) The SIM card returns "instruction successfully executed" to the terminal.

Since a small number of terminals do not completely follow the international norms to log in to the network, during the process of logging in to the network, the small number of user terminals will skip the operation of obtaining the preferred network list from the first file and attempting to log in. Therefore, it is necessary to add a A monitoring process is used to ensure the implementation of the preferred roaming. As shown in Figure 3, the preferred roaming method adds an instruction for the monitoring terminal to read a second file in the process of the terminal attempting to log in to the network used before the shutdown. The specific process is as follows:

301) When the user turns on the computer, the terminal sends an instruction to read the second file;

302) The SIM card acquires the MCC and MNC data in the location information (Location AreaInformation-LAI) data segment stored in the second file;

303) The SIM card acquires the MCC data in the International Mobile Subscribe Identity (IMSI) stored in a third file;

304) Compare whether the MCC in the LAI data segment of the second file is the same as the MCC in the IMSI of the third file, if they are the same, jump to step 309, if they are different, perform the next step;

305) The SIM card searches for the first file, and searches in order whether there is a record of network information, the MCC of the record is the same as the MCC content in the LAI data segment of the second file, if there is, go to the next step, if not, then Execute step 309;

306) Obtain the MNC of the first matched record;

307) Judging whether the MNC is the same as the MNC content in the LAI data segment in the second file, if the same, jump to step 309, if different, perform the next step;

308) replace the content of the MNC in the LA I data segment of this second file with this MNC content;

309) The SIM card executes an instruction to read the second file.

In this way, when the terminal issues an instruction to read the second file, the contents of the MCC and MNC read from the LAI data segment in the second file are always consistent with the information in the first file, which can It is ensured that the operation of obtaining the preferred network list from the first file and attempting to log in by all terminals will not be skipped during the process of logging in to the network.

In addition, the processing flow for the second file will increase the time for the terminal to read the second file, and the increased time cannot exceed 0.2 seconds.

According to the stipulations in the international norms, the terminal cannot automatically log in to access the network that appears in the network information list in a fourth file. Therefore, in order to ensure the normal realization of preferred roaming, it is necessary to ensure that the preferred network information cannot appear in the fourth file. in the network information list of the file. As shown in Figure 4, the processing flow for realizing prohibiting the content in the first file from appearing in the fourth file is as follows:

401) The terminal sends an instruction to the SIM card to update the fourth file;

402) The SIM card obtains updated content;

403) Judging whether the updated content appears in the first file, if yes, jump to step 405, if not, execute the next step;

404) The SIM card executes an instruction to update the fourth file;

405) The SIM card returns "instruction successfully executed" to the terminal.

The processing flow of the fourth file will increase the time for the terminal to update the fourth file, and the increased time cannot exceed 0.2 seconds.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements of the technical solutions without departing from the spirit and scope of the technical solutions of the present invention shall be covered by the scope of the claims of the present invention.

Claims (8)

1. A method for optimal roaming, the specific workflow includes: 501) When the user turns on the device, the terminal sends an instruction to read a second file in the SIM card, and the second file stores the network information used by the user before the shutdown; 502) The SIM card obtains the mobile country code MCC and mobile network code MNC data in the area information LAI data segment stored in the second file; 503) The SIM card obtains the MCC data in the International Mobile Subscriber Identity IMSI stored in the third file, and the network information to which the user belongs is stored in the third file; 504) Compare whether the MCC in the LAI data segment of the second file is the same as the MCC in the IMSI of the third file, if they are the same, go to step 509, if they are different, go to the next step; 505) The SIM card searches the first file, and searches in order whether there is a record of network information, the MCC of the record is the same as the MCC content in the LAI data segment of the second file, if there is, go to the next step, if not, then execute Step 509, storing network information in the preferred network list in the first file; 506) Obtain the MNC of the first matched record; 507) Judging whether the MNC is the same as the MNC content in the LAI data segment in the second file, if the same, jump to step 509, if different, perform the next step; 508) Replace the MNC content in the LAI data segment of the second file with the MNC content; 509) The SIM card executes an instruction to read the second file; 510) Whether the terminal tries to log in to the network used before shutdown stored in the second file, if yes, then use the network, if not, go to the next step; 511) The terminal attempts to log in to the network to which the user belongs, if possible, then use the network, if not, go to the next step; 512) The terminal reads the network information in the preferred network list from the first file stored in the user's SIM card; 513) Try to log in to a network in the preferred network list according to the order of the list, if possible, use the network, if not, go to the next step; 514) Judging whether the current network of all signals has failed to log in, if not, try to log in to the network according to the order of the strength of the current network signal, if so, then log in to the network failed, and the network cannot be used currently. 2. The method for preferred roaming as claimed in claim 1, characterized in that, the first file in the method can be remotely updated by an over the air-OTA mode. 3. The method for preferred roaming according to claim 2, characterized in that the processing of the second file in the method will increase the time for the terminal to read the file, and the increased time is less than or equal to 0.2 seconds. 4. The method for preferred roaming according to claim 1, characterized in that, in the method, the user has no right to modify the first file. 5. The method for preferred roaming according to claim 4, characterized in that, the workflow for implementing restriction of user modification authority in the method is as follows: 71) The terminal sends an update instruction to the SIM card of the user; 72) Judging whether the instruction is an instruction to update the first file, if yes, jump directly to step 74, if not, execute the next step; 73) The SIM card executes the update command; 74) The SIM card returns "command successfully executed" to the terminal. 6. The method for preferential roaming according to claim 1, characterized in that the network information stored in the first file is prohibited from appearing in a fourth file for storing network information that prohibits users from logging in. 7. The method for preferred roaming as claimed in claim 6, characterized in that, the workflow for realizing that the network information in the first file is prohibited from appearing in the fourth file is as follows: 91) The terminal sends an instruction to update the fourth file to the SIM card; 92) The SIM card obtains updated content; 93) Judging whether the updated content appears in the first file, if yes, jump to step 95, if not, execute the next step; 94) The SIM card executes an instruction to update the fourth file; 95) The SIM card returns "command execution successful" to the terminal. 8. The preferred roaming method according to claim 7, wherein the processing of the fourth file increases the time for the terminal to update the fourth file, and the increased time is less than or equal to 0.2 seconds.

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