Intersystem handover method and apparatus
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United States of America Patent
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Sep 5, 2000
Grant Date -
N/A
app pub date -
Sep 10, 1997
filing date -
Sep 10, 1997
priority date (Note) -
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Abstract
A method and apparatus for providing seamless transfer of a active call between cellular communication systems operating in different signal formats and different modes of handoff request initiation. An example being a mobile initiated CDMA/FDMA/TDMA system like IS-661 and a TDMA/FDMA network initiated system like PCS 1900. The system which initiates handoff requests internally is aware of all the IDs of all the BTSs of the other communication system with which it is to interact and the MSs monitors signals of both formats for maintaining a table of received signals from nearby cells, the cell IDs and signal quality, while maintaining an active call and the further ability to transmit a handover request on a command channel while in the active call mode.
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