KR20030047476A - Method for automatically selecting public land mobile network in portable radio telephone - Google Patents

Abstract

A method for automatically selecting a public land mobile communication network in a portable wireless terminal having a plurality of home public land mobile communication networks and a subscriber identity module having corresponding access technologies stored therein, wherein the power is supplied to check the subscriber identity module. A process of identifying a type of service available at a location where a terminal is to receive a service, a process of recognizing a service selected by a user among the identified services, and selecting a home public land mobile communication network suitable for the selected service The process of determining and registering there.

Description

METHOOD FOR AUTOMATICALLY SELECTING PUBLIC LAND MOBILE NETWORK IN PORTABLE RADIO TELEPHONE}

The present invention relates to a method for automatically selecting a public land mobile network (hereinafter referred to as PLMN) in a portable wireless terminal, and in particular, even if an operator does not support intergenerational roaming, the terminal can support multiple generations. By providing a method for allowing a user to selectively receive a service.

PLMN refers to a public telecommunication network that consists of a mobile terminal, a base station, a subscriber location, a registration device, and a mobile communication switch to enable telephone service of mobile operators. A home PLMN (hereinafter referred to as HPLMN) is a PLMN used during the selection of a PLMN when trying to receive services from the service provider. The current HPLMN is stored in the Subscriber Identity Module (SIM) and has the feature of being searched with priority when selecting PLMN in automatic mode or manual mode. .

FIG. 2 is a flowchart illustrating a method for automatically selecting a public land mobile communication network in a known GSM type portable wireless terminal among the services selectable in FIG. 1.

Step 101 represents a null state where nothing has started after the switch off.

Step 102 represents a state of checking whether there is a registered PLMN (hereinafter, referred to as RPLMN). That is, the RPLMN here refers to the PLMN when a location update attempted last was successful.

Step 103 shows a state of selecting the RPLMN.

Step 104 refers to receiving system information of RPLMNs among the frequencies currently around and attempting to update the location of the frequencies. In other words, it refers to registering in a corresponding cell.

In step 105, since the location update is successful, the current PLMN is displayed to the user.

Step 106 shows a successful camping in the PLMN.

Step 107 represents selecting the top one from the list when an attempt to RPLMN fails or when there is no RPLMN, and upon user reselection request. Here, the list is a) HPLMN, b) Preferred PLMN in SIM list in priority order, c) Visited PLMNs (VLMNs) that are randomly selected among other PLMNs greater than -85 dBm. d) Visitor PLMNs according to the decreasing order of signal strength.

Known protocol 11.10 H.1.10 discloses the types of PLMNs stored in the SIM, where the HPLMN, the last registered PLMN, and the preferred PLMN are stored with their respective priorities. Protocol 11.10 10.3.35 also stores access technology for each PLMN for the preferred PLMN.

In step 108, the BCCH data (system information) is read in the surrounding frequency corresponding to the PLMN selected in step 107, and an attempt is made to update the location.

In step 109, when the user reselection starts, the last selected PLMN is placed in order d) of the list.

Step 110 indicates whether there is an allowable PLMN when camping in the PLMN successfully loses radio coverage. PLMNs allowed here are PLMNs that are not in the (forbidden) PLMN list.

In step 111, when there is no allowed PLMN, a waiting state for a possible PLMN appears.

Step 112 indicates a state in which there is an available and allowable PLMN if there is no more PLMN list after failing in step 108. PLMNs useful here are: not barred, PLMNs with C1> 0)

In step 113, if nothing is found in step 112, the RPLMN or HPLMN is selected.

In step 114, when the allowable PLMN found in step 112 is found, the first one is selected.

In step 115, if it fails in step 108, the next PLMN in the list on the lower left is selected.

As such, the second generation communication technology, the Global System for Mobile communication (GSM) method or the Code Division Multiple Access (CDMA) method, is being serviced in the future, but in the future, General Packet Radio Service (GPRS), International Mobile Telecommunications (2000), 2.5G and 3G technologies, such as Universal Mobile Telecommunications System (UMTS), will be available. When this new service is supported, the user can only use one service unless the single operator has all the business rights to support the services. In other words, if a generation of communication technology is to be serviced, operators may wish to support roaming between different generations of communication technology. This is inconvenient for the user.

Accordingly, an object of the present invention is to provide a method for allowing a user to selectively receive a service even if a service provider does not support roaming between several generations of communication technologies by allowing the terminal to support several generations of communication technologies.

In order to achieve the above object, the present invention provides a method for automatically selecting a public land mobile communication network in a portable wireless terminal having a subscriber identification module storing a plurality of home aerial land mobile communication networks and corresponding access technologies. When supplied, checking the subscriber identification module to identify the type of service available at the current terminal to receive the service, recognizing the service selected by the user among the identified services, and It is characterized in that the process of selecting the home aerial land mobile communication network to determine the cell and register there.

1 is a diagram illustrating the structure of a public land mobile communication network list having priority;

2A illustrates the structure of a preferred public land mobile communications network list with access technology.

2B is a diagram for explaining access technology.

3 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to a first embodiment of the present invention.

4 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to a second embodiment of the present invention.

5 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to a third embodiment of the present invention.

6 is a flowchart showing another operator selection processing routine of FIG.

FIG. 7 is a view showing, by way of example, a state in which information on a possible service and a service provider providing the service received from the network is displayed on a screen of the terminal;

8 is a table showing an example of supportable service information by operator and operator

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals have the same reference numerals as much as possible even if displayed on different drawings. In describing the present invention, if it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The portable wireless terminal according to the present invention includes a subscriber identification module, in which a plurality of home aerial land mobile communication networks and corresponding access technologies are stored.

Currently, CDMA terminals do not use SIM, but have evolved into the third generation, and have a storage function similar to GSM using U-SIM (Universal SIM) or even using a storage location inside the terminal.

In order to automatically select the public land mobile communication network in such a portable wireless terminal, first, when the power is supplied, the subscriber recognition module is checked to determine the types of services available at the current terminal to receive the service. After recognizing the service selected by the user among the identified services, the home public land mobile communication network suitable for the selected service is selected to determine a cell and registered there.

3 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to an embodiment of the present invention.

When the power is supplied in step 110, the subscriber identification module is checked in step 130 to perform an initial operation on a service selected as a default.

In other words, by measuring the intensity of the various frequencies to determine where the control channel (channel that carries shared information). The control channel plays a role of transmitting information of each cell to the terminal, thereby determining which service (eg, GSM, IMT-2000, UMTS, etc.) is provided. For the initial smooth and fast service, it is good to decide which service to be provided by default.

After the initial operation, in step 130, a service selection menu is displayed for allowing a user to select a service available at a location where a terminal is currently being serviced.

When detecting a menu selection by the user, in step 140, it is checked whether the service mode is changed from the current service mode. If the service mode is changed as a result of the check, the initial operation of the changed service is performed in step 150, and then the process returns to step 130. On the other hand, if it is determined in step 140 that the service mode change is not made, in step 160, a home aerial land mobile communication network suitable for the current service mode is selected to determine a cell and register there.

If the selected service is a GSM method, the PLMN selection will be performed by performing the process as shown in FIG. 1, and the CDMA or IMT-2000 or UMTS method has a unique method of automatically selecting a PLMN like the GSM method. Of course there will be.

4 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to another embodiment of the present invention.

It is assumed that the types of services the user can select are GSM, CDMA, IMT-2000, and UMTS. If the user selects a service while the service selection menu is displayed, the service can be selected immediately.

For example, if the user selects the CDMA method while the service selection menus GSM, CDMA, IMT-2000, and UMTS are displayed on the screen of the portable wireless terminal in step 130, the terminal recognizes the selection in step 240 and in step 250. In CDMA service initial operation, the CDMA service can be immediately executed.

In the case of FIG. 3 described above, there is a difference in that another service can be selected by repeating steps 130-150.

5 is a flowchart illustrating a method for automatically selecting a public land mobile communication network of a portable wireless terminal according to a third embodiment of the present invention.

In step 511, the portable wireless terminal, which is in a state where a specific service (eg, GSM, idle mode) is enabled, receives information about a type of service and a provider that are available at the current location from the network and displays the information in step 512. In operation 513, the user checks whether any service and service provider are selected from the services and service providers. When the service and the service provider are selected, a frequency of the service is found in step 514. As a result, if it is detected in step 515 that the frequency search is successful, in step 521 it is registered in the home aerial land mobile communication network of the selected operator and enters the idle mode.

If it is detected in step 515 that the frequency search has failed, in step 516, the user checks whether the user wants to return to the previous service and returns to the GSM idle mode. Alternatively, in step 518, if the user checks whether or not the user wants to select another operator, and then selects another operator, in step 519, the processing routine is performed. Otherwise, in step 520, a failure is indicated and the limited service is provided or no more services are provided.

6 is a flowchart showing another operator selection processing routine of FIG.

If another operator selection processing routine is performed, first, information about the operator is displayed in step 612. In operation 613, it is checked whether an arbitrary operator is selected among the displayed operators by the user. If the service provider is selected, in step 614, a frequency of the corresponding service is found. As a result, if it is detected in step 615 that the frequency search is successful, in step 618 it is registered in the home aerial land mobile communication network of the selected operator and enters the idle mode.

If it is detected in step 615 that the frequency search has failed, in step 616, the user checks whether the user wants to return to the previous service and returns to the GSM idle mode. Otherwise, in step 617, indicate a failure, provide a limited service, or no longer provide a service.

FIG. 7 is a diagram illustrating an example of a state in which information on a possible service and a service provider providing the corresponding service received from the network is displayed on a screen of the terminal.

● Indication is an indication that the HPLMN of the service stored in the SIM storage location is notified.

8 is a table illustrating service information available for each service provider and service provider by way of example.

As shown, the operator code 0111 can support CDMA and UMTS services.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, the present invention allows operators to store multiple HPLMNs and their corresponding access technologies (e.g. GSM, UMTS, CDMA2000, etc.) in a single SIM (or their internal storage). Even if it does not support roaming (eg GSM ↔ CDMA2000) between several generations of communication technologies, users can select the desired generation of communication technology and receive service.

Claims (6)

Claims [1] A method for automatically selecting a public land mobile communication network in a portable wireless terminal having a subscriber identity module storing a plurality of home aerial land mobile communication networks and corresponding access technologies, Checking the subscriber identification module when the power is supplied, identifying the type of service available at the current terminal to receive the service; Recognizing a service selected by the user among the identified services; And selecting a home public land mobile communication network suitable for the selected service and determining a cell and registering therein. Claims [1] A method for automatically selecting a public land mobile communication network in a portable wireless terminal having a subscriber identity module storing a plurality of home aerial land mobile communication networks and corresponding access technologies, A first process of performing initial work on a service selected by default by checking the subscriber recognition module when power is supplied; A second process of displaying a service selection menu for allowing a user to select a possible service at a location where a terminal is currently being serviced after the initial operation; A third step of checking whether a menu selection by the user is changed to a service mode different from the current service mode; If the service mode is changed, the fourth process of performing the initial work on the changed service and then returning to the second process; If it is determined in the third step that the service mode change is not made, the method comprising the fifth step of selecting a home public land mobile communication network suitable for the current service mode to determine the cell and register there. Claims [1] A method for automatically selecting a public land mobile communication network in a portable wireless terminal having a subscriber identity module storing a plurality of home aerial land mobile communication networks and corresponding access technologies, A first process of receiving and displaying information on a type of service and a service provider available at a location where a terminal is currently receiving a service from a network; A second process of checking whether any of the services and providers displayed by the user are selected; A third process of finding a frequency of a corresponding service when the service and a service provider are selected; And a fourth step of registering in the home public land mobile communication network of the selected operator if the frequency is found to be successful in the third step. The method of claim 3, If the frequency finder fails in the third process, Steps 5-1 of checking whether the user wants to select another provider and performing the corresponding processing routine when the user wants to select another provider; Step 5-2 of checking whether the user wants to select another service and selecting another service, returns to the second process; And a step 5-3 of returning to the first step if the user wants to return by checking whether the user wants to return to the previous service. The method of claim 4, wherein Step 5-1 includes the first step of receiving and displaying information on a business operator; A second step of checking whether any of the displayed operators is selected by the user; A third step of finding a frequency of a corresponding service when the service and a service provider are selected; And a fourth step of registering in the home aerial land mobile communication network of the selected operator if the frequency is found to be successful in the third step. 4. The method of claim 3, wherein the service is GSM, CDMA, code division multiple access, IMT-2000, or UMTS.