• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    METHOD FOR AUTOMATICALLY SWITCHING FROM A LOCAL IMSI TO AN IMSI ROAMING AND VICEVERSA, AND SUBSCRIBER IDENTITY MODULE, ADAPTED TO BE USED IN A MOBILE STATION. The invention relates to a method for automatically switching from a Local IMSI to an IMSI Roaming and vice versa, said IMSI Local and IMSI Roaming being contained in a SIM card, adapted to be used in a mobile station, and adapted to contain elementary files, where it comprises the step of triggering switching from IMSI to another, by detecting an update of the elementary file comprising prohibited terrestrial public mobile networks (EF FPIMN).
    公开号:BR112012031960B1
    申请号:R112012031960-4
    申请日:2010-06-25
    公开日:2021-05-04
    发明作者:Vinod Sachanandani
    申请人:Gemalto S.A.；
    IPC主号:
    专利说明:

    Field of Invention
    [0001] The invention relates to the field of mobile telecommunications, in particular, in the field of roaming (visitor) in mobile networks of mobile subscribers between the home network and foreign networks.
    [0002] The invention particularly relates to a method for automatically switching from an International Local Mobile Subscriber Identity (Local IMSI) to an International Mobile Roaming Subscriber Identity (IMSI Roaming) and vice versa. Background of the Invention
    [0003] Different network operators, which provide voice and data services to their own subscribers, may also provide these services to subscribers of other networks. These different networks may be available in the same country. When a subscriber leaves his home network and receives services from another network, he is said to be roaming. More precisely, "national roaming" or "local roaming" is where customers move from their home network to other networks within the same country. This type of roaming is necessary when the local network does not provide service in all territories and/or states of the nation. Another case of roaming, referred to as "international roaming", when the network operator provides services in a foreign country, international roaming involves making or receiving calls or sms... from outside the borders of the home country.
    [0004] In order to offer roaming services to their subscribers, when traveling, mobile network operators (MNO) or mobile virtual operators (MVNO) need to put in place roaming agreements with each operator in each country. Roaming hubs give access to the MNO or MVNO, its hundreds of roaming agreements and its infrastructure. A subscriber can then switch to networks, with which the operator of the subscriber's home network has a roaming agreement. When a subscriber moves in an external network, he can be switched to one of the plurality of communication networks, which are available within the relevant geographic area and have a roaming agreement with the home network.
    [0005] Roaming behavior is, for example, defined in telecommunications standards and is controlled, for example, by data stored on the subscriber identity module (SIM) card, in appropriate files present on the SIM, such as EFLOCI file, EFPLMNSel, EFFPLMN, etc.
    [0006] As is known, EFLOCI contains the last selected network. More precisely, this file contains information about the mobile network to which the user is connected at all times, and contains the Registered Public Land Mobile Network (RPLMN), which is the current roaming network to which the mobile device is registered . The EFLOCI file comprises the Local Area Information (LAI), which comprises the Mobile Country Code (MCC), the Mobile Network Code (MNC), the Local Area Code (LAC). The MCC identifies the country, to which the network belongs, where the user is connected. This file can be modified each time the user connects to a different network. The MNC is a code, which identifies a network within a country. Then the EFLOCI MNC, in combination with the MCC, defines the mobile network to which the user is connected. The LAC identifies the location area in which the subscriber is operating.
    [0007] The EFPLMNSel file indicates, for example, the user's preferred network or operator (PLMN), to which the terminal should try to connect, when the user cannot connect to their home network, that is, when the user starts roaming. If the terminal cannot connect to the network indicated in EFLOCI, then it will try to connect to a preferred network as indicated in EFPLMNSel, otherwise it will try to connect to any available network.
    [0008] The EFFPLMN file contains the prohibited list of networks, which should not be selected. According to GSM standards, when a device or a mobile station (MS) tries to connect to any network, and if the network (MNO) does not provide access, MS updates the EFFPLMN on the SIM card with MCC-MNC specific to that network . This file is further used by MS to identify those networks, which are PLMN Prohibited. The elementary file contains encoding for four Prohibited PLMNs (FPLMN). It is read by the device as part of the SIM initialization procedure and indicates which PLMNs MS should not automatically attempt to access.
    [0009] The device modifies its roaming behavior based on the contents of such roaming control files on the SIM card. To do this, the user must be successfully registered with the mobile service of the external network, also here called the visited network.
    [00010] Dual IMSI is, for example, a well-known SIM-based standalone application that manages two IMSIs for a subscriber on a SIM card: an IMSI for the Home Network (MNO) and an IMSI for international roaming. The local IMSI is used in the subscriber's home country. IMSI Roaming is used, while abroad, to connect to a roaming hub. Switching between two IMSIs is done automatically by the app depending on location. The app detects when the end user is roaming and switches to IMSI Roaming.
    [00011] All MNOs, which use the Dual IMSI application on the SIM card, one for the Domestic network and the other for the Roaming network, guarantee that while using the Local IMSI, the user does not get service on the Roaming or International Network. Likewise, it is also ensured by the MNO that while using IMSI Roaming, the user does not receive service on the Domestic network.
    [00012] As a managed service, this Dual IMSI is extremely simple to implement. The app is distributed over the air, so the launch is quick, and any subsequent changes to the country lists are done in the same way.
    [00013] However, currently in many countries, this automated application may not be available, and if it is available then it may be too expensive for the MNO to implement it. In this case, it may be necessary for the end user to manually change the IMSI from IMSI Local to IMSI Roaming when connecting in a foreign country and likewise manually switch the IMSI from IMSI Roam to IMSI Local when the end user return to your home network. This can be done, for example, using a SIM Tool Kit application. Furthermore, as described above, switching from IMSI Local to IMSI Roaming, and vice versa, is only possible if the Home network has established an agreement with the visited network. Operators need to develop new bilateral agreements with selected partners, still using hub-based services to other destinations, which can be costly and time-consuming to implement.
    [00014] Switching can only be possible if the foreign country has been identified. Thus, if the app has any problem identifying the new roaming location, switching will not occur, and the end user will not be able to use their mobile device. Invention Summary
    [00015] It is an object of the present invention to provide a method to automatically switch from a Local IMSI to an IMSI Roaming and from an IMSI Roaming to the Local IMSI.
    [00016] For that, the present invention provides a method for automatically switching from a Local IMSI to an IMSI Roaming and vice versa, said Local IMSI and IMSI Roaming being contained in a Subscriber Identity Module card (SIM card), adapted to be used at a mobile station, and adapted to include elementary files, wherein it comprises the step of causing switching from one IMSI to another, by detecting an update of the elementary file comprising prohibited terrestrial public mobile networks (EFFPLMN).
    [00017] According to other aspects of the invention: - the method may comprise switching from Local IMSI to IMSI Roaming, if the IMSI indicated in the elementary EFIMSI file is the Local IMSI, and if the prohibited terrestrial public mobile networks file comprises at least one piece of data other than a Mobile Country Code of the home network; - the method may comprise switching from IMSI Roaming to IMSI Local, if the IMSI indicated in the elementary file EFIMSI is IMSI Roaming, and if the file of prohibited terrestrial public mobile networks comprises at least one Mobile Country Code of the home network; it can understand the routing of a file, which includes the latest registered networks, before switching; - it can understand the file routing, containing the prohibited terrestrial mobile public networks, then proceed to switching; it can understand updating a file, which includes preferred networks; - it can understand SIM card initialization.
    [00018] Thanks to this method, an automatic switch is easily operated, using the EFFPLMN file update for automatic IMSI switch.
    [00019] The invention also provides a Subscriber Identity Module card, adapted to be used in a Mobile Station, which includes a Local IMSI and an IMSI Roaming, elementary files, in which it comprises an application adapted to switch from Local IMSI to IMSI Roaming and vice versa, according to the method of the invention.
    [00020] The invention is now described, by way of example, with reference to the accompanying drawings. The specific nature of the following description is not to be construed as limiting in any way the general nature of this Summary. Brief Description of Drawings
    [00021] In order that the manner in which the above-cited and other advantages and characteristics of the present invention are obtained, a more particular description of the invention briefly described above will be made by reference.
    [00022] Notwithstanding any other forms, which may fall within the scope of the present invention, preferred forms of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: FIG. 1 schematically shows an embodiment of a method, according to the invention, for a switch from a Local IMSI to an IMSI Roaming; FIG. 2 schematically shows another embodiment of the method for a switch from IMSI Roaming to a Local IMSI. Detailed Description of Preferred Embodiments
    [00023] The present invention can be understood in accordance with the detailed description provided herein.
    [00024] Fig. 1 shows an embodiment of the method, according to the invention, in which an end user uses his mobile station MS in a roaming network with the local IMSI.
    [00025] The MS mobile station has a SIM card, which is capable of managing a Local IMSI and an International IMSI, also called IMSI Roaming.
    [00026] The end user has moved, for example, from India to Singapore.
    [00027] As described above, the SIM card of the mobile station MS contains elementary files, such as specified, for example, in GSM 11.11, such as the file EFLOCI, EFPLMNSel, EFFPLMN ,"EF 6F7B" etc., which are used in roaming .
    [00028] The EFFPLMN file contains an encoding for prohibited PLMNs. It is read by MS as part of the SIM boot procedure and indicates PLMNs, which MS should not attempt to access automatically. Thus, this file only contains data about MNO circles in India (which means MNO circles prohibited in India). A circle can be defined as a region of a country where the MNO operates. The MNC changes from circle to circle, and the MCC remains constant for a country.
    [00029] The EFLOCI file contains data on the latest registered networks of MNO Circles in India.
    [00030] The SIM card also comprises a specific file or application, called "EF App IMSI Status" (AIS), which is able to indicate which IMSI is present in the EFIMSI file "EF 6F07". The data contained in this field is set to "00" and indicates that the IMSI used is the Local IMSI by default.
    [00031] In this embodiment, the application stores the value of the MCC.
    [00032] In a first step, the mobile station is turned on.
    [00033] Next, the mobile station MS tries to connect to the available networks, based on the content of the elementary files EFLOCI, EFFPLMN and EFPLMN. Foreign networks do not give access to MS to connect, as IMSI Local has no link with foreign network. The mobile station tries to locate networks and provides its MCC-MNC to all networks in Singapore. MNOs do not authorize the user to obtain services as IMSI Local has no connection with any network in Singapore.
    [00034] Therefore, the MS updates the EFFPLMN file on the SIM card with the MCC-MNCs of the foreign networks, which are, in this embodiment, the Singapore MNOs, such as "25F5XX25F5XXFFFFFFFFFFFF", where XX is the MNC of any Singapore's MNO.
    [00035] A file update event is used by the application so that it detects that the EE FPLMN file has been updated.
    [00036] The SIM application has a file update event trigger, defined in the EFFPLMN file. Once the application receives this event, it checks the MCC content of the EFFPLMN file and, more precisely, whether the EFFPLMN file comprises any non-Local MCC. It checks if there is any MCC other than the home country MCC. This is constituted, in the example mentioned, to verify whether, among the MCC present in the EFFPLMN file, there is an MCC in addition to the MCC in India, that is, in addition to the 404/405.
    [00037] The MCC of the visited country is present in the EFFPLMN file and the IMSI present in the EFIMSI is the Local IMSI. The application detects that the user is not in their home country, if the MCC value in any of the four MCC-MNC pairs is different from those related to the home country, and if EF AIS is "00". In the present embodiment, it checks whether any MCC in the EFFPLMN file is different from that of India, i.e. different from 404/405, and whether the content of the EF AIS is 00.
    [00038] If this is the case, which routes EFLOCI with default content, eg "FFFFFFFFFFFFFF0000FF01", switches IMSI, from Local IMSI to IMSI Roaming, routes EFFPLMN file with "FF ... FF". It then updates the EFPLMNSel file, if required by an operator with the corresponding International PLMN list.
    [00039] It then updates the EF App IMSI Status (AIS) to "01" and executes the proactive SIM REFRESH mode 03 command (SIM INITIALIZATION), which asks MS to perform a SIM initialization according to GSM 11.11. This command also makes it possible to restart a card session, by initializing the SIM.
    [00040] When IMSI is switched from Local IMSI to IMSI Roaming, MS searches for available networks. The MNO in Singapore, which now has a link with the IMSI Roaming Circle, is able to authenticate and provide its services to the subscriber.
    [00041] In the following description, the user has moved from the foreign or visited country to his home country, as shown in Figure 2, for example, from Singapore to India.
    [00042] The IMSI used by the user on the SIM card is IMSI Roaming, the EF App IMSI Status (AIS) containing "01", which indicates that the IMSI used is IMSI Roaming, since the IMSI present in the EFIMSI file is the IMSI Roaming.
    [00043] The EFPLMN file comprises only Local MNO Circles, which correspond to the India MNO Circle, and the EFLOCI file comprises the latest registered networks of the visited MNO.
    [00044] When the set is turned on, as per MS standards, it tries to search for networks and supply their MCC-MNC for all available network in India Specific Circle.
    [00045] The mobile station MS tries to connect to the available networks, based on the content of the elementary files EFLOCI, EFFPLMN and EFPLMN.
    [00046] MNO Local has a configuration at the end of the network, not to provide service to IMSI Roaming. Available MNOs do not authorize the user to obtain services. Home networks do not give MS access to connect as the network does not allow IMSI Roaming to connect to the Home network.
    [00047] MS updates the EFFPLMN file on the SIM card with MCC-MNC specific to the home country networks, which are, in our example, the MNOs in India. The EFFPLMN is updated, for example, to "04953004FXXFFFFFFFFFF", where XX is the MNC of any MNO in the Indian Circle. A file update event is used by the application to detect that the EFFPLMN file has been updated.
    [00048] The SIM application has a file update event trigger, defined in the EFFPLMN file.
    [00049] Once the application receives this event, it checks the MCC content of the EFFPLMN file and, more precisely, whether the EFFPLMN file comprises any Local MCC. It checks if any MCC matches one of the Local MCCs. This consists, in the example cited, in verifying whether, among the MCC present in the EFFPLMN file, there is an MCC, in addition to the MCC from Singapore, which is an MCC from India.
    [00050] The MCC of the country of origin is present in the EFFPLMN, and the IMSI present in the EFIMSI is the IMSI Roaming. So, if the MCC value in any of the four MCC-MNC pairs is different from those referring to the country visited, that is, if there is any MCC, which is an MCC from the country of origin, for example, 404/405 for the India, and if EF AIS is "01", the app detects that the user is in their home country.
    [00051] If there is any Local MCC in the EFFPLMN file, it routes the EFLOCI file with default content, switches the IMSI from IMSI Roaming to the Local IMSI, and routes the EFFPLMN file with "FF ... FF". It then updates the EFPLMNSel file, if required by an operator, with the corresponding International PLMN list.
    [00052] It then updates the EF App IMSI Status (AIS) to "00" and executes the proactive SIM REFRESH mode 03 command (SIM INITIALIZATION), which asks MS to perform a SIM initialization according to GSM 11.11. This command also makes it possible to restart a card session by resetting the SIM.
    [00053] When IMSI is switched from IMSI Roaming to IMSI Local, MS searches for available networks. The MNO in India is able to authenticate and provide its services to the subscriber.
    [00054] In another embodiment (not shown in the drawings), the user moves from Singapore to a country other than the country of origin, for example, to China. In this case, the MCC is not updated with India's MCC. The app remains dormant and does nothing.
    [00055] In another embodiment, the Local MCC value can be, for example, stored as a Local MCC value by default in the application's buffer.
    [00056] Thanks to this method, the application allows you to easily switch automatically from Local IMSI to International IMSI or vice versa, based on a file update event in EFFPLMN. When the EFFPLMN file is updated with the foreign PLMN, the IMSI switch is automatically done from IMSI Local to International. Likewise, when IMSI International is in use, and the EFFPLMN is updated with the Home PLMN, the IMSI switch is automatically done from International to Local. The EFFPLMN file is routed when the IMSI switch is done.
    [00057] This method advantageously eliminates the need for the current dual IMSI application to be "visible" to the end user to manually change the IMSI via the SIM Tool Kit menu.
    [00058] This method advantageously allows switching from IMSI Local to IMSI Roaming, and vice versa, even if there is no agreement between the Home network and the visited network.
    [00059] Another advantage is that using this method reduces permissions, increasing memory size. The size of this IMSI automatic switching application according to the invention is reduced by approximately 30% compared to a normal solution.
    [00060] The implementation by the card and the service to the end user is easier and highly profitable for the MNO.
    [00061] When the user switches from the Local network to any Roam (Visitor) network, the Local MNO does not allow the user's network access to International Network in Local IMSI. Thus, the EFFPLMN on the SIM is updated by the handset with the International MCC-MNC. Using the EFFPLMN value, and according to the MCC values, from which it is deduced that the user is in the International Network, and that the IMSI needs to be switched from Local IMSI to IMSI Roaming. The same procedure is applied when the user returns to the Home Network with an IMSI Roaming.
    权利要求:
    Claims (8)
    [0001]
    1. METHOD FOR AUTOMATICALLY SWITCHING FROM A LOCAL IMSI TO AN IMSI ROAMING AND VICE VERSA, characterized in that it comprises said IMSI Local and IMSI Roaming being contained in a SIM card, adapted for use in a mobile station and adapted to include elementary files , in which it comprises the step of triggering the switching from one IMSI to another, upon detecting an update of the elementary file, comprising prohibited terrestrial public mobile networks (EF FPLMIN).
    [0002]
    2. METHOD, according to claim 1, characterized in that it comprises switching, from IMSI Local to IMSI Roaming, if the IMSI indicated in the elementary file EFIMSI is the Local IMSI, and if the file of prohibited terrestrial public mobile networks comprises at least one piece of data other than a Mobile Country Code of the Home network.
    [0003]
    3. METHOD, according to claim 1, characterized in that it comprises switching from IMSI Roaming to IMSI Local, if the IMSI indicated in the elementary file EFIMSI is IMSI Roaming, and if the file of prohibited terrestrial public mobile networks comprises at least one Home network Mobile Country Code.
    [0004]
    4. METHOD, according to one of claims 1 to 3, characterized in that it comprises the file routing, including the last registered networks, before proceeding with the switch.
    [0005]
    5. METHOD, according to one of claims 1 to 4, characterized in that it comprises the routing of the file containing the prohibited terrestrial public mobile networks, after proceeding with the switching.
    [0006]
    6. METHOD, according to claim 5, characterized in that it comprises the update of a file, which includes the preferred networks.
    [0007]
    7. METHOD according to claim 5 or 6, characterized in that it comprises the initialization of the SIM card.
    [0008]
    8. SUBSCRIBER IDENTITY MODULE, ADAPTED TO BE USED IN A MOBILE STATION, characterized by the fact that it comprises a Local IMSI and IMSI Roaming, elementary files, in which it comprises an application adapted to switch from IMSI Local to IMSI Roaming and vice versa according to the method of claim 1 to 7.
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    法律状态:
    2019-01-15| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2020-01-14| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 8/26 , H04W 48/18 Ipc: H04L 29/06 (1990.01), H04W 8/06 (2009.01), H04W 8/ |
    2020-01-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-03-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-04| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 04/05/2021, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    PCT/IB2010/001550|WO2011161490A1|2010-06-25|2010-06-25|Auto imsi swich for international roaming|
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