Abstract:
A handheld electronic device adapted to display a listing of known networks, scan for available networks, display a listing of the available networks and enable the entry of information relating to manually entered networks. In addition, the device is adapted to (1) enable the addition of preferred networks to a preferred network list wherein the preferred networks are one or more of: (i) certain of the known networks selected from the listing of known networks, (ii) certain of the available networks selected from the listing of available networks, and (iii) the manually entered networks; (2) enable the assignment of a priority value to each of the preferred networks; and (3) utilize the preferred networks for performing wireless communications when the device is in a roaming situation, wherein the preferred networks are utilized in a priority order that is based on the priority value assigned to each of the preferred networks.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates generally to handheld electronic devices and, more particularly, to a handheld electronic device that enables a user to establish a prioritized list of preferred networks to be used in roaming situations. The invention also relates to an improved method of establishing a prioritized list of preferred networks to be used by a handheld electronic device in roaming situations. 
     2. Description of the Related Art 
     Numerous types of handheld electronic devices are known. Examples of such handheld electronic devices include, for instance, personal data assistants (PDAs), handheld computers, two-way pagers, cellular telephones, and the like. Such handheld electronic devices are generally intended to be portable and thus are relatively small. 
     Many handheld electronic devices include and provide access to a wide range of integrated applications, including, without limitation, email, telephone, short message service (SMS), multimedia messaging service (MMS), browser, calendar and address book applications, such that a user can easily manage information and communications from a single, integrated device. These applications are typically selectively accessible and executable through a user interface that allows a user to easily navigate among and within these applications. 
     Many handheld electronic devices include wireless telephone and data (e.g., email, SMS, Internet) functionality. As is known in the art, wireless services, such as telephone and data services, are provided by way of an air interface involving radio frequency (RF) communications between wireless enabled equipment, such as a handheld electronic device described above, and one or more networks of land based radio transmitters or base stations. Each such network is commonly referred to as a public land mobile network (PLMN). PLMNs interconnect with other PLMNs and the public switched telephone network (PSTN) for telephone communications or with Internet service providers for data and Internet access. 
     In order to use wireless communications functionality, a user must subscribe with a wireless service provider or operator. The subscription permits the user to utilize the PLMN operated by the service provider or operator (referred to as the “home PLMN”). As is known in the art, roaming is a service offered by PLMN operators which allows a subscriber to use his or her wireless enabled equipment while in the service area of another operator (and outside of the user&#39;s home PLMN). Roaming requires an agreement between operators of technologically compatible systems to permit customers of either operator to access the other&#39;s PLMN. Service providers or operators typically charge a higher per-minute fee for calls placed outside their home calling or coverage area (the area serviced by their PLMN). 
     As is also known in the art, devices, such as handheld electronic devices, that include wireless functionality, such as telephone and data functionality, are provided with a subscriber identity module card (SIM card). A SIM card is a small printed circuit board that contains subscriber details, including data that identifies the user to the service provider, security information, and memory for a personal directory of numbers. In addition, the SIM card stores a pre-set, prioritized list of particular PLMNs to be used by the device in roaming situations. The particular PLMNs included in the list are normally based on the marketing preferences of a particular operator. However, as will be appreciated, different PLMNs have differing charges associated with them and offer different levels of reliability and service quality. Thus, a user may desire to use PLMNs other than those pre-stored in the SIM card and/or use PLMNs in a different order of priority than that specified in the SIM card based on issues of cost, reliability, and service quality, among others. Thus, there is a need for an improved handheld electronic device that enables a user to establish a prioritized list of preferred PLMNs to be used in roaming situations. 
     SUMMARY OF THE INVENTION 
     An improved handheld electronic device and an associated method enable a user to selectively establish a prioritized list of preferred PLMNs to be used in roaming situations. As a result, a user is able to select particular PLMNs based on issues of PLMN cost, reliability, and service quality, among others. 
     These and other aspects of the invention are provided by a wirelessly enabled handheld electronic device including an input apparatus, a communications subsystem, a display, a processor, and a memory storing one or more applications executable by the processor. The one or more applications are adapted to display a listing of one or more known networks for which network information is stored in the memory, scan for one or more available networks, which are networks available for use in conducting wireless communications in the area in which the handheld electronic device is currently located, and display a listing of the available networks. The applications are also adapted to enable the entry of information relating to one or more manually entered networks. Furthermore, the applications are adapted to (1) enable the addition of one or more preferred networks to a preferred network list wherein the preferred networks are one or more of: (i) certain of the known networks selected from the listing of known networks, (ii) certain of the available networks selected from the listing of available networks, and (iii) the manually entered networks; (2) enable the assignment of a priority value to each of the preferred networks; and (3) utilize one or more of the preferred networks for performing wireless communications when the handheld electronic device is in a roaming situation, wherein the preferred networks are utilized in a priority order that is based on the priority value assigned to each of the preferred networks. 
     The communications subsystem may include a SIM card, wherein the applications are further adapted to store the preferred network list in the SIM card. The preferred network list also preferably includes network information for each of said preferred networks, such as the MNC and MCC for each of the preferred networks. The handheld electronic device may also include a thumbwheel that may be used to scroll up and down for data selection purposes. 
     Preferably, the preferred network list is displayed in a display order corresponding to the priority order. In one case, the priority value of a first one of the preferred networks is a highest priority, and the priority value of a second one of the preferred networks is a lowest priority, and the priority order is sequential beginning with the first one of the preferred networks and ending with the second one of the preferred networks. The applications may be further adapted to enable the movement of a selected one of the preferred networks on the display to create an altered display order, wherein the priority value assigned to one or more of the preferred networks is changed such that the priority order corresponds to the altered display order. In addition, the one or more applications may be further adapted to enable the deletion of a selected one of the preferred networks on the display to create an altered display order, wherein the priority value assigned to one or more of the preferred networks is changed such that the priority order corresponds to the altered display order. 
     According to another aspect of the invention, a method of establishing a prioritized list of networks to be used by a handheld electronic device in roaming situations is provided. The method includes displaying a listing of one or more known networks upon request of a user of the handheld electronic device, with each of the known networks having network information stored by the handheld electronic device, scanning for one or more available networks upon request of the user, with each of the available networks being available for use in conducting wireless communications in an area in which the handheld electronic device is currently located, and displaying a listing of the available networks. The method further includes receiving information relating to one or more manually entered networks when input into the handheld electronic device by the user. Finally, the method includes adding one or more preferred networks to a preferred network list, the preferred networks being one or more of: (i) certain of the known networks selected from the listing of known networks, (ii) certain of the available networks selected from the listing of available networks, and (iii) the manually entered networks, and assigning a priority value to each of the preferred networks, wherein one or more of the preferred networks are utilized for performing wireless communications when the handheld electronic device is in a roaming situation in a priority order that is based on the priority value assigned to each of the preferred networks. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       A full understanding of the invention can be gained from the following Description of the Preferred Embodiment when read in conjunction with the accompanying drawings in which: 
         FIG. 1  is a front view of an improved handheld electronic device in accordance with the invention; 
         FIG. 2  is a block diagram of the handheld electronic device of  FIG. 1 ; and 
         FIGS. 3 through 20  are exemplary views of a portion of the display of the handheld electronic device of  FIGS. 1 and 2  that illustrate a routine or routines for enabling a user to selectively establish a prioritized list of preferred PLMNs to be used in roaming situations according to the invention. 
     
    
    
     Similar numerals refer to similar parts throughout the specification. 
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An improved handheld electronic device  4  in accordance with the invention is depicted generally in  FIGS. 1 and 2 . The handheld electronic device  4  includes a housing  8 , a display  12 , an input apparatus  16 , and a processor  20  ( FIG. 2 ) which may be, without limitation, a microprocessor (μP). The processor  20  is responsive to inputs received from the input apparatus  16  and provides outputs to the display  12 . While for clarity of disclosure reference has been made herein to the exemplary display  12  for displaying various types of information, it will be appreciated that such information may be stored, printed on hard copy, be computer modified, or be combined with other data, and all such processing shall be deemed to fall within the terms “display” or “displaying” as employed herein. Examples of handheld electronic devices are included in U.S. Pat. Nos. 6,452,588 and 6,489,950, which are incorporated by reference herein. The handheld electronic device  4  is of a type that includes a wireless telephone capability which, as will be described in greater detail below, enables a user to selectively establish a prioritized list of preferred PLMNs to be used in roaming situations in accordance with the invention. As used herein, the terms “phone” and “telephone” shall refer to any type of voice communication initiated and conducted over a wired and/or wireless network. 
     As can be understood from  FIG. 1 , the input apparatus  16  includes a keyboard  24  having a plurality of keys  26 , and a rotatable thumbwheel  28 . As used herein, the expression “key” and variations thereof shall refer broadly to any of a variety of input members such as buttons, switches, and the like without limitation. The keys  26  and the rotatable thumbwheel  28  are input members of the input apparatus  16 , and each of the input members has a function assigned thereto. As used herein, the expression “function” and variations thereof can refer to any type of process, task, procedure, routine, subroutine, function call, or other type of software or firmware operation that can be performed by the processor  20  of the handheld electronic device  4 . 
     As is shown in  FIG. 2 , the processor  20  is in electronic communication with memory  44 . Memory  44  can be any of a variety of types of internal and/or external storage media such as, without limitation, RAM, ROM, EPROM(s), EEPROM(s), and the like, that provide a storage register for data storage such as in the fashion of an internal storage area of a computer, and can be volatile memory or nonvolatile memory. The memory  44  further includes a number of applications executable by processor  20  for the processing of data. The applications can be in any of a variety of forms such as, without limitation, software, firmware, and the like, and the term “application” herein shall include one or more routines, subroutines, function calls or the like, alone or in combination. 
     As is also shown in  FIG. 2 , processor  20  is in electronic communication with communications subsystem  45 . Communications functions for handheld electronic device  4 , including data and voice communications (wireless telephone), are performed through communications subsystem  45 . Communications subsystem  45  includes a transmitter and a receiver (possibly combined in a single transceiver component), a SIM card, and one or more antennas. Other known components, such as a digital signal processor and a local oscillator, may also be part of communications subsystem  45 . The specific design and implementation of communications subsystem  45  is dependent upon the communications network in which handheld electronic device  4  is intended to operate. For example, handheld electronic device  4  may include a communications subsystem  45  designed to operate with the Mobiltex™, DataTAC™ or General Packet Radio Service (GPRS) mobile data communication networks and also designed to operate with any of a variety of voice communications networks, such as AMPS, TDMA, CDMA, PCS, GSM, and other suitable networks. Other types of data and voice networks, both separate and integrated, may also be utilized with handheld electronic device  4 . Together, processor  20 , memory  44 , and communications subsystem  45  may, along with other components (having various types of functionality), be referred to as a processing unit. 
     In  FIG. 1 , the display  12  is depicted as displaying a home screen  43  that includes a number of applications depicted as discrete icons  46 , including, without limitation, an icon representing a phone application  48 , an address book application  50 , a messaging application  52  which includes email, SMS and MMS applications, and a calendar application  54 . In  FIG. 1 , the home screen  43  is currently active and would constitute a portion of an application. Other applications, such as phone application  48 , address book application  50 , messaging application  52 , and calendar application  54  can be initiated from the home screen  43  by providing an input through the input apparatus  16 , such as by rotating the thumbwheel  28  and providing a selection input by translating the thumbwheel  28  in the direction indicated by the arrow  29  in  FIG. 1 . 
       FIGS. 3 through 17  are exemplary depictions of display  12  of handheld electronic device  4  that illustrate a routine or routines performed by processor  20  for enabling a user to selectively establish a prioritized list of preferred PLMNs to be used in roaming situations according to the invention. By utilizing the invention, a user of handheld electronic device  4  is able to override the list of particular PLMNs to be used by the handheld electronic device  4  in roaming situations that is pre-stored in the SIM card forming a part of communications subsystem  45  by establishing and storing a user selected and prioritized list of PLMNs to be used by the handheld electronic device  4  in roaming situations. In the particular embodiment shown in  FIGS. 3 through 17 , this list is called the “My Preferred Network List.” 
       FIG. 3  is an exemplary depiction of display  12  showing an “Options-Network” screen  50  generated by an operating application of handheld electronic device  4  which provides a user with information and options relating to the PLMNs used or to be used by handheld electronic device  4 . As seen in  FIG. 3 , menu  52  may be accessed from “Options-Network” screen  50  in a known manner using input apparatus  16 . Menu  52  includes an item  54  entitled “My Preferred Network List.” When a user desires to create a prioritized list of PLMNs to be used by handheld electronic device  4  in roaming situations according to the invention, the user first selects item  54 . When a user does so, a “Preferred Network List” screen  56  as shown in  FIG. 4  is displayed on display  12 . “Preferred Network List” screen  56  displays a prioritized listing  58  of PLMNs selected by the user as described herein to be used by handheld electronic device  4  in roaming situations. As seen in  FIG. 4 , the listing  58  is initially empty. To add a PLMN to the listing  58 , the user accesses menu  60  in a known manner and selects item  62  entitled “Add Network.” Next, as seen in  FIG. 6 , “Add Network” screen  64  is displayed to the user on display  12 . At this point, the user has three options to choose from for adding a PLMN to the listing  58 . Each option is described below. 
     In the first option, a user can manually add a PLMN to the listing  58  by entering identifying information for the PLMN into the data fields provided on “Add Network” screen  64  using input apparatus  16 . In particular, to add a particular PLMN to the listing  58 , the user must enter the mobile network code (MNC) for the PLMN at field  66 , the mobile country code (MCC) for the PLMN at field  68 , and the priority the user wishes to assign to that PLMN at field  70 . The respective priorities assigned to the PLMNs listed on listing  58  determines the order in which the PLMNs are to be used by handheld electronic device  4 , if available, in roaming situations. 
     In the second option, the user can add a PLMN to the listing  58  by selecting the PLMN from a group of “known networks” stored in memory  44  of handheld electronic device  4  (the MNC and MCC is stored for each such “known network”). To do so, the user accesses menu  72  in a known manner and selects item  74  entitled “Select From Known Networks.” Next, as seen in  FIG. 8 , “Find” screen  76  is displayed on display  12 . “Find” screen  76  includes a listing  78  of all of the “known networks” stored by memory  44  of handheld electronic device  4 . A user may then identify for selection a particular PLMN from listing  78  by scrolling down listing  78  in a known manner using input apparatus  16  or by typing a portion of or all of the name of the PLMN using input apparatus  16  as shown in  FIG. 9 . Once a particular PLMN has been identified, a user may then select the PLMN for inclusion in the listing  58  by accessing menu  80  in a known manner and selecting item  82  entitled “Select Network” as shown in  FIG. 10 . When this is done, “Add Network” screen  64  is displayed on display  12  as shown in  FIG. 11 , and information for the PLMN is automatically provided in fields  66  (MNC) and  68  (MCC), as well as field  84 , which is the name of the PLMN. The user must then enter information into field  70  using input apparatus  16  to establish the priority to be assigned to the PLMN. Once all of the information has been entered, the selected PLMN may be saved to the listing  58  by accessing menu  72  in a known manner and selecting item  86  entitled “Save” (which item was added to menu  72  because listing  58  is no longer empty; compare  FIG. 7 ) as shown in  FIG. 12 . As seen in  FIG. 13 , when saved, the selected PLMN appears in listing  58 . When all the desired PLMNs have been added to and prioritized in the listing  58 , listing  58  may be saved to the SIM card forming part of communications subsystem  45  by accessing menu  60  in a known manner and selecting item  88  entitled “Save” (which item was added to menu  60  because listing  58  is no longer empty; compare  FIG. 5 ) as seen in  FIG. 14 . Note that, for illustrative purposes,  FIG. 14  assumes that additional PLMNs have been added to the listing  58 , and thus the listing  58  shown in  FIG. 14  includes additional PLMNs not shown in  FIG. 13 . Once the listing  58  is saved to the SIM card, it, and not the pre-stored list described above, is used to determine which and in what order PLMNs are to be used by handheld electronic device  4 , if available, in roaming situations. In other words, listing  58  overrides the pre-stored list of PLMNs provided with the SIM card. 
     In the third option, the user can add a PLMN to the listing  58  by selecting the PLMN from a group of “available networks,” which handheld electronic device  4  is able to locate from its current location using communications subsystem  45  and a known network scanning procedure. To do so, the user accesses menu  72  in a known manner and selects item  90  entitled “Select From Available Networks” as shown in  FIG. 15 . Next, handheld electronic device  4  performs a scan to locate the current “available networks.” As seen in  FIG. 16 , while this is being done, a dialog box  92  is displayed on display  12  to inform the user that the scan is taking place. Once the scan is completed, “Find” screen  76  as seen in  FIG. 17  is displayed on display  12  and includes a listing  94  of all of the “available networks” located during the scanning procedure. The user may then select a particular PLMN for inclusion in the listing  58  and save the listing  58  to the SIM card in the manner described in connection with  FIGS. 8 through 14  above. In one embodiment, “available networks” will consist of only “known networks” stored by memory  44 . Alternatively, any network located during the scan may be a “available network.” Again, once the listing  58  is saved to the SIM card, it, and not the pre-stored list provided in the SIM card described above, is used to determine which and in what order PLMNs are to be used by handheld electronic device  4 , if available, in roaming situations. 
     According to an aspect of the invention, the user may easily reorder, and thus change the priority of, the PLMNs listed in listing  58  by selectively moving their location in listing  58 . Specifically, according to one embodiment, if a user wants to move a PLMN appearing on listing  58  (for example, the “ABA Network”), the user can, as shown in  FIG. 18 , identify the PLMN to be moved on “Preferred Network List” screen  56  using the input apparatus in a known manner, access menu  60  therefrom, and select item  96  entitled “Move.” When this is done, the identified PLMN is highlighted as shown in  FIG. 19 . The identified and highlighted PLMN may then be moved to another location on the listing  58  using input apparatus  16 , preferably, although not necessarily, by rotating thumbwheel  28  (alternatively, various keys, such as “up” and “down” arrow keys, may be used). Once the identified PLMN is in the desired location on listing  58 , its location may be confirmed using input apparatus  16 , preferably, although not necessarily, by pressing thumbwheel  28 , at which time the moved PLMN will no longer be highlighted. As seen in  FIG. 20 , once the PLMN is moved, the PLMNs in listing  58  are automatically reordered and renumbered, meaning their assigned priority is changed, if necessary. If desired, the listing  58  as currently appearing in “Preferred Network List” screen  56  may then be saved to the SIM card (with the new assigned priorities) in the manner described in connection with  FIGS. 8 through 14 . In addition to moving PLMNs listed in listing  58 , particular PLMNs may be deleted from listing  58  and/or stored information (the information in fields  66 ,  68 ,  70  and  84 ) for particular PLMNs may be displayed on display  12  by identifying the particular PLMN as described above and then selecting the appropriate item (“Delete” or “View”) in menu  60  shown in  FIG. 18 . When a PLMN is deleted from listing  58 , the remaining PLMNs in listing  58  are automatically reordered and renumbered, meaning their assigned priority is changed, if necessary. 
     Thus, the invention provides a handheld electronic device that enables a user to selectively establish a prioritized list of preferred PLMNs to be used in roaming situations. In this manner, a user is able to select and prioritize particular PLMNs based on issues of PLMN cost, reliability, and service quality, among others, thereby saving the user money and/or enhancing performance of the handheld electronic device. 
     While specific embodiments of the invention have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the invention which is to be given the full breadth of the claims appended and any and all equivalents thereof.