×

Method and apparatus for synchronizing databases in portable communication devices

  • US 6,968,209 B1
  • Filed: 02/22/2000
  • Issued: 11/22/2005
  • Est. Priority Date: 07/05/1999
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for tracking changes to a database stored in a smart card associated with electronic equipment, the method comprising the steps of:

  • storing, in both a memory of said electronic equipment and said smart card, a checksum associated with said database, wherein said electronic equipment includes a mobile phone;

    making a change to said database;

    comparing said checksum stored in said memory of said electronic equipment and said checksum stored in said smart card;

    calculating, after said change, a modified checksum based on said database;

    storing said modified checksum in said memory of said electronic equipment and in said smart card;

    logging said change in a chance log in said electronic equipment;

    flagging said change log as invalid if said checksums do not match as a result of said comparing step; and

    synchronizing said database stored in said smart card with a corresponding database stored in another device using a method which is selected depending upon whether said change log is valid.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×