Abstract:
The system accepts a Short Message System data packet transmitted from a cell site to a mobile station and updates the contents of an address book located in a non-volatile RAM within the mobile station. Upon the occurrence of an event, such as a change in the area code, the system automatically updates the phone book so that a person does not have to perform the tedious task of determining which exchange prefixes within an area code have been affected and then manually updating large numbers of address book entries.

Description:
FIELD OF THE INVENTION 
     The present invention pertains generally to the field of wireless communications, and more specifically to updating stored data within a wireless communication device. 
     BACKGROUND 
     The field of wireless communications has many applications including, e.g., cordless telephones, paging, cellular, wireless local loops, and satellite communication systems. A particularly important application is cellular telephone systems (also including Personal Communications Services (PCS) for mobile subscribers. 
     Wireless communication devices, such as cellular telephones, are widely used as a replacement for conventional telephone systems. Hereinafter the term cellular will be used to refer to any wireless communication device. In addition to functioning as a replacement for a conventional telephone, wireless communication devices offer the advantage of portability, thus enabling the user to establish a wireless communication link between virtually any two locations on Earth. 
     In addition to conventional voice communication, wireless communication devices also provide features such as voicemail, voice messaging, and automatic callback notification. Callback notification allows a caller to automatically transmit his telephone number to simplify the process of returning a call. For example, the user of a wireless telephone may place a call that is not received by the intended recipient. A message may be left for the intended recipient and include a “callback number,” which corresponds to the caller&#39;s mobile identification number. The message recipient may readily establish a communication link with the wireless communication device using the callback number. 
     Other features, such as three-way calling, are also readily implemented using the conventional communication device. The user of the wireless communication device may establish a first communication link by selecting a stored telephone number from a telephone book storage area within the wireless communication device. When the first communication link is established, the user establishes the second communication link by manually entering a second destination telephone number or by selecting a second destination telephone number from the telephone book storage area. 
     An additional group of features include directory services, such as a local personal phonebook stored on the communication device. Typical devices allow for the individual entry of user names and telephone numbers stored as a contact entry. The phonebook includes a number of such records. The device accesses the internal phonebook to facilitate automated dialing by reducing the required number of keystrokes. 
     Telephone numbers often need to be updated. People move, change jobs or otherwise change telephone numbers. Businesses likewise change their telephone numbers. Updating contact data record in a telephone directory can be a tedious manual process. The contact data is updated by navigating a directory to access the particular record. The data to be changed is modified by an appropriate predefined combination of alphanumeric keystrokes. 
     Recent proliferation of telecommunications devices has seen a significant increase for requests for new telephone numbers. It is not uncommon for a single person/entity to have multiple traditional landlines, wireless telephone, pager and/or fax machines, each requiring its own unique telephone number. Such an increase is steadily exhausting the supply of telephone numbers within given area codes. As a result, additional area codes are being allocated. 
     Mobile phone users are being faced with the task of updating multiple record entries to reflect changes due to additional area codes. This task may be extremely tedious and frustrating. What is needed is a simple, effective and accurate way to update telephone book record entries when necessary. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a system and method for receiving downloadable update commands from an external source comprising an input device for accepting the update commands, memory for storing data, the data including variable strings, a processor operably connected to said memory and said input device for processing an update command in order to update a first predetermined variable string with a second predetermined variable string identified by the update command. The embodiment of the invention accepts a Short Message System data packet transmitted from a cell site to a mobile station and updates the contents of an address book located in non-volatile RAM within the mobile station. Upon the occurrence of an event, such as a change in the area code, the system automatically updates the phone book so that a person does not have to perform the tedious task of determining which exchange prefixes within an area code have been affected and then manually updating large numbers of address book entries. 
     The device may further include an option to operate a local global replacement initiated at the mobile station itself. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 illustrates a radiotelephone system in which an embodiment of the current invention operates. 
     FIG. 2 illustrates a radiotelephone unit in which an embodiment of the current invention operates. 
     FIG. 3 illustrates in flowchart form a method of operation of an embodiment of the present invention. 
     FIG. 4 illustrates in flowchart form an additional method of operation of an embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An illustrative implementation of a microprocessor-based telephone system in accordance with the invention is presented here. The illustration uses an automobile cellular phone as an example, but it will be understood by those skilled in the art that the invention can be implemented in virtually any telecommunications system. 
     FIG. 1 illustrates a typical wireless radiotelephone system  100  including a mobile station  102  having a unique mobile identification number (MID) stored in a suitable location such as an electrically eraseable programmable read-only memory (EEPROM, not shown). Telephone units of this kind are well known in the art and are described here only in sufficient detail to aid understanding the invention. Mobile station  102  communicates with cell site.  111  through antenna  110  via paging, signaling and voice/data channels. Cell site  111  (two are illustrated) communicates to Mobile Terminal Switching Office (MTSO)  112  via a radiolink or landline and then to the Public Switched Telephone Network (PSTN)  112 A via a high capacity landline or similar connection. 
     Such mobile stations are typically hand held devices but historically have been associated with an automobile. However, the embodiments described within refer to any wireless device, whether or not handheld, mobile, fixed in location or any combination thereof. 
     Referring now to FIG. 2, the telephone unit  102  includes a keypad  105  with a mute key  105 A and function keys  105 B; equivalently, the keypad  105  could be located separately from the handset. Also included in the telephone unit  102  are a speaker  106  and a microphone  107 , shown as being mounted within the handset  104  but either or both of which could equivalently be mounted apart from the handset, either separately (e.g., in a telephone operator&#39;s headset or in wall mountings), or approximately together (e.g., in a walkie-talkie or speakerphone configuration). The telephone unit  102  further includes a transceiver  108 , a status display  113  and a logic circuitry  114 . It will be apparent to those of ordinary skill that if the keypad  105 , the speaker  106 , and the microphone  107  are all located apart from the handset  104 , the handset can be dispensed with. 
     FIG. 3 illustrates a manual method for updating records in the telephone directory. The telephone directory is stored in a portion of memory  116 . The process begins with step  305 . In step  310  a user manually enters the alphanumeric keystrokes used to properly navigate the user interface into phonebook edit mode. When the appropriate record is located, the user manually edits the data to make the appropriate correction. The user may optionally designate the edit as a global replacement. In this embodiment, the user is prompted in step  320  to enter the first variable X 1  for which to search. The user is then prompted in step  325  to enter the second variable X 2 , which is the replacement contents for variable X 1 . 
     In step  330  variable X 2  is written into memory  116 . An optional confirmation dialog box is displayed in step  335  asking for confirmation of the just modified record. If approval is given by depressing the requested confirmation key, then the change is written into memory. Control passes to step  340  where a search for further occurrences of the variable X 1  is executed. If a further occurrence is found, control passes to step  330  where the process is repeated. Upon exhaustion of all occurrences of the variable X 1 , control passes to block  345  where processing terminates and the mobile unit returns to a previous menu in the user interface. 
     Another embodiment of the present invention utilizes some of the features found in Short Message Service (SMS) (TIA/EIA/IS-637), which is hereby incorporated by reference. A brief overview of Short Message Service will now be discussed. 
     The Short Message Service (SMS) allows the exchange of short alphanumeric messages between a mobile station and the cellular system and between the cellular system and an external device capable of transmitting and optionally receiving short messages. The external device may be a voice telephone, a data terminal or a short message entry system. This system applies to any device that may be operationally coupled with a voice telephone and/or data terminal. 
     The Short Message Service consists of message entry features, administration features, and message transmission capabilities. These features are distributed between a cellular system and the SMS message center (MC) which together make up the SMS system (not shown). The MC may be separate from or physically integrated into the cellular system. Short message entry features are provided through interfaces to the MC and the mobile station. Senders use these interfaces to enter short messages, intended destination addresses and various delivery options. 
     Message Center interfaces optionally include features such as audio response prompts and Dual Tone Multiple Frequency (DTMF) reception for dial in or dedicated terminal access. Mobile Station interfaces may include keyboard and display features to support message entry. Additionally, a cellular voice service subscriber can use normal voice or data features of the mobile station to call an SMS system to enter a message. 
     An SMS Teleservice can provide the option of specifying priority level, future delivery time, message expiration interval, or one or more of a series of short, predefined messages. 
     If supported by the Teleservice, the sender can request acknowledgement that the message was received by the mobile station. An SMS recipient, after receiving a short message, can manually acknowledge the message. Optionally, the recipient can specify one of a number of predefined messages to be returned to the sender with the acknowledgement. 
     SMS administration features include message storage, profile editing, verification of receipt and status inquiry capabilities. 
     SMS transmission capabilities provide for the transmission of short messages to or from an intended mobile station, and the return of acknowledgments and error messages. These messages and acknowledgments to or from the mobile station are transmitted whether it is idle or engaged in a voice or data call. 
     The cellular service provider may offer SMS transmission to its cellular voice and data customers only, or may provide an SMS only service without additional data transmission capabilities. 
     The standard also provides for the broadcast of messages. All available mobile stations on a CDMA paging channel can receive a broadcast message. A broadcast message is not acknowledged by the mobile station. Broadcast Messaging Services may be made available to mobile stations on a CDMA Paging Channel as well as mobile stations in a call on a CDMA Traffic Channel. 
     FIG. 4 illustrates in flowchart format a specific embodiment of the present invention. Block  405  initiates the process at START. In step  410 , the mobile station receives a downloaded update command from an external SMS service according to standard TIA/EIA/IS-637. The mobile station optionally checks to see in step  420  if the update has previously been executed in this particular unit. For example, a flag is checked to see if the update has been executed. If the flag has been set, the mobile unit knows not to attempt to make the change. If the flag has not been set, the mobile unit knows to continue the change process. A service provider may continually broadcast updates for a predetermined time frame to allow updating by a mobile unit that may not have been turned recently on within the service area. 
     In step  425 , the mobile unit processor receives a first variable X 1  to search for. The variable X 1  may include, as an example, area code 619 and exchange prefix 651. Another embodiment would have variable X 1  listed as last name of someone who has recently changed his/her last name due to court order or marriage. Another example would include the name of a company or division of a company listed within the directory who has recently undergone a name change due to acquisition, divestiture or corporate re-organization. 
     In step  430 , the processor enters the second variable X 2  which is intended to replace X 1 . Of course, variable X 1  and X 2  are strings of predetermined length. An example of this is area code 858 and exchange prefix 651. In step  435 , variable X 2  globally replaces variable X 1 . In another embodiment, variable X 2  may refer to the location of an intended replacement string. In still another embodiment, variables X 1  and X 2  may define a terminus, such as an Internet Protocol (IP) or other address. Optional Step  440  confirms each replacement either individually or all at once before permanently writing the change to memory. Step  445  checks to see that all occurrences of the string to be replaced have been identified. If not, control is returned to Step  435 . If all occurrences have been replaced, then control passes to Step  450 , STOP. 
     It is to be understood that even though various embodiments and advantages of the present invention have been set forth in the foregoing description, the above description is illustrative only, and changes may be made in detail, yet remain within the broad principles of the invention. For example, it should be noted that the claimed invention applies to any device that can update a phonebook directory and is not limited to wireless communication devices Therefore, the present invention is to be limited only by the appended claims.