Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-12-19
2000-02-01
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455436, 455439, 455440, H04Q 722, H04Q 736
Patent
active
060213280
ABSTRACT:
A method and system is disclosed for triggering handoff of a call from a CDMA network to an AMPS network on which it is overlaid responsive to a determination that the CDMA RF link has degraded to such an extent that the call quality will be degraded significantly or the call is likely to be dropped is disclosed. A handoff of a call from a CDMA network to an AMPS network if, at a given time: (1) the number of forward link erasures is greater than a first maximum number of forward link erasures; or (2) the number of reverse link erasures is greater than a first maximum number of forward link erasures; or (3) the number of forward link erasures is greater than a second maximum number of forward link erasures and the forward traffic channel gain is greater than a maximum forward traffic channel gain; or (4) the number of reverse link erasures is greater than a second maximum number of reverse link erasures and the ratio of energy per bit to noise power spectral density on the reverse link ("EB/NO") is greater than a maximum EB/NO. In alternative embodiments, the present invention may be used to trigger handoff of a call from a first CDMA cell site to a second CDMA cell site or to an AMPS cell site serving a cell on which the cell served by the first CDMA cell site is not overlaid.
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Boettger David A.
Book William B.
Curtis David E.
Jalali Ahmad
Bost Dwayne D.
Gantt Alan
Northern Telecom Limited
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