Synchronization recovery for a mobile telephone

Details Synchronization recovery for a mobile telephone Synchronization recovery for a mobile telephone

1996-06-27

2000-05-09

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronization failure prevention

370503, 3951821, H04L 700, H04J 306, G06F 1100

Patent

active

060614099

ABSTRACT:
A system is disclosed for permitting a mobile telephone to recover an ongoing communication following a temporary interruption of operation, e.g., such as caused by an interruption of power to the mobile telephone, which includes circuitry and processor control to calculate the duration of the temporary interruption and for restoring synchronization of the mobile telephone to the mobile communication system. The circuitry stores synchronizing information prior to the temporary interruption and cycles synchronizing circuitry of the mobile telephone at a higher than normal cycling rate to restore synchronization of the mobile telephone with the mobile communication system. In a further embodiment, circuitry is disclosed for restoring the output of spread code generating circuitry in a spread spectrum digital mobile telephone to a phase used by a transmitting station of the mobile communication system. In another embodiment of the disclosed invention, circuitry is disclosed for restoring the output of a time slot generator in a spread spectrum digital mobile telephone to synchronization with a time slot pattern used by a transmitting station of the mobile communication system.

REFERENCES:
patent: 3920921 (1975-11-01), Pitroda et al.
patent: 4837850 (1989-06-01), Maisel et al.
patent: 5280541 (1994-01-01), Marko et al.
patent: 5384828 (1995-01-01), Brown et al.

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