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Multi-mode mobile apparatus and method for calculating frame/time slot offsets, and allowing mobiles to synchronize with different mobile protocols/schemes

  • US 6,396,827 B1
  • Filed: 12/03/1998
  • Issued: 05/28/2002
  • Est. Priority Date: 06/16/1998
  • Status: Expired due to Fees
First Claim
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1. In a communication system in which network infrastructure is operable to generate a synchronization signal pursuant to a first TDMA (time-division, multiple-access) communication scheme having a first time frame definition defined therein, and a mobile station operable pursuant to a second TDMA communication scheme having a second time frame definition defined therein, an improvement of apparatus for calculating a relative time offset by which to offset the synchronization signal, thereby to permit synchronizing of the mobile station to the synchronization signal, said apparatus comprising:

  • a determiner coupled to receive the synchronization signal and operable responsive thereto, said determiner for determining an order number representative of a first-communication-scheme time frame located within a sequence of the first-communication-scheme time frame at a selected determining time;

    a converter operable responsive to the order number determined by said determiner, said converter for converting the order number to a corresponding frame number of a second-communication-scheme time frame number; and

    a timing offset calculator operable responsive to a value representative of the second-communication-scheme time frame number formed by said converter, said timing offset calculator for calculating a relative time offset between a current frame and time slot in the sequence of the first-communication-scheme time frames, the order number of which said determiner determines, and an allocated frame and time slot in the sequence of second communication-scheme time frames.

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