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System and method for effecting information transmission and soft handoff between frequency division duplex and time division duplex communications systems

  • US 6,611,507 B1
  • Filed: 07/30/1999
  • Issued: 08/26/2003
  • Est. Priority Date: 07/30/1999
  • Status: Expired due to Term
First Claim
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1. A method for controlling mobile unit communication handoffs between a frequency division duplex (FDD) communication system and a time division duplex (TDD) communication system, the method comprising:

  • transmitting between the mobile unit and a current one of the FDD and TDD communication systems while moving towards a targeted one of the FDD and TDD communication systems, the current communication system being different from the targeted communication system;

    generating a pilot search signal corresponding to a transmission range of the targeted communication system;

    monitoring pilot search signals at designated frequencies using one of time division processing and frequency division processing;

    initiating the communication handoff from the current communication system to the targeted communication system when the mobile unit recognizes a predetermined threshold level of the pilot search signal;

    synchronizing concurrent communications between the mobile unit and both the current and targeted communications systems; and

    terminating transmission between the mobile unit and the current communication system and maintaining communication between the mobile unit and the targeted communication system when synchronization is complete.

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