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

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

G - Physics

04

G

G04G 9/00 (2006.01) G04G 99/00 (2010.01) H04M 1/725 (2006.01)

Patent

CA 2209519

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.

L'heure est générée dans un radiotéléphone cellulaire par contrôle des changements du champ d'identification de concordance (REGID) des messages de service lorsque le champ REGID est incrémenté. L'utilisateur du radiotéléphone cellulaire doit indiquer l'heure et une valeur correspondante du champ REGID est obtenue, puis l'intervalle entre les mises à jour du champ REGID est déterminé. Lorsque l'on a besoin de savoir l'heure, une valeur actuelle du champ REGID est calculée et l'heure est calculée sur la base de l'heure indiquée par l'utilisateur, la différence entre les valeurs du champ REGID et l'intervalle entre les mises à jour. L'heure peut ainsi être générée dans des systèmes de radiotéléphones cellulaires qui ne transmettent pas l'heure sans qu'il soit nécessaire d'installer des puces d'horloge en temps réel dans le radiotéléphone cellulaire.

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