Systems and methods for generating a current time of day in a ce

Details Systems and methods for generating a current time of day in a ce Systems and methods for generating a current time of day in a ce

1995-01-05

1996-12-31

Miska, Vit W.

Horology: time measuring systems or devices

Combined with disparate device

368 47, 379 59, 455 331, 455 541, G04B 4700, G04C 1102, H01Q 704

Patent

active

055900925

ABSTRACT:
A current time of day is generated in a cellular radiotelephone by monitoring changes in the registration ID (REGID) field of the overhead messages as the REGID is incremented. The cellular radiotelephone user is prompted to indicate a time of day, and a corresponding REGID value is obtained. The time interval between REGID updates is determined. When a current time of day is required, a current REGID value is obtained and a current time of day is calculated based on the user indicated time of day, the difference between the REGID values and the update interval. Current time of day may thereby be generated in cellular radiotelephone systems which do not broadcast a current time of day, without the need for real time clock chips in the cellular radiotelephone.

REFERENCES:
patent: 4775999 (1988-10-01), Williams
patent: 5258964 (1993-11-01), Koma et al.
patent: 5363377 (1994-11-01), Sharpe
patent: 5375104 (1994-12-01), Ishii et al.
patent: 5455807 (1995-10-01), Nepple et al.
patent: 5469411 (1995-11-01), Owen

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