Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1993-09-09
1996-09-17
Bost, Dwayne D.
Telephonic communications
Audio message storage, retrieval, or synthesis
379 59, 455 332, 455 334, H04Q 738
Patent
active
055576575
ABSTRACT:
A mechanism for handing off between an overlay cell (48) and an underlay cell (50). The underlay cell (50) is smaller than and has a common area with the overlay cell. A threshold level (RSSI-THP) is established which corresponds to the sum of a nominal threshold level (RSSI-U) and a value obtained by subtracting the current attenuation level (MT) from the minimum attenuation level permitted by the underlay cell (MU). If the RF signal level of the serving cell (RSSI-SRV) is greater than the established threshold level (RSSI-THP), the mobile unit is handed off to the underlay cell (50), if not already in that cell; and handed off to the overlay cell (48) if equal to or less than the established threshold level (RSSI-THP), if not already in that cell.
REFERENCES:
patent: 4613990 (1986-09-01), Halpern
patent: 4718081 (1988-01-01), Brenig
patent: 5278991 (1994-01-01), Ramsdale et al.
patent: 5422933 (1995-06-01), Barnett et al.
Bost Dwayne D.
Denson-Low Wanda K.
Hughes Aircraft Company
Lindeen III Gordon R.
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