Busy or unreachable mobile phone availability via SMS
Original Publication Date: 2001-Oct-01
Included in the Prior Art Database: 2003-Jul-23
It is a common occurrence for an individual to try and call another individual on the telephone but be unable to get through, i.e., to have progress to the point where the destination telephone is ringing. A com- mon situation is when the destination number is busy. For standard wired telephone numbers, this is gener- ally the only reason why a call cannot be completed. For cellular telephones, however, the situation is more complex.
Information / Kommunikation
Busy or unreachable mobile phoneavailability via SMS
Idee: Jonathan Eyal Gardi, DK-Aalborg
It is a common occurrence for an individual to try andcall another individual on the telephone but be unableto get through, i.e., to have progress to the pointwhere the destination telephone is ringing. A com-mon situation is when the destination number is busy.For standard wired telephone numbers, this is gener-ally the only reason why a call cannot be completed.For cellular telephones, however, the situation ismore complex.
In addition to simply being busy, a very significantpercentage of cellular phones are normally unavail-able. A cellular telephone can be unavailable formany reasons including that the telephone is off, thebattery is exhausted, the telephone is out of range orcannot receive a sufficiently strong signal and thetelephone can still be unavailable due to a lack ofavailable channels within the given cells.
Redialing is possible but is active for a limited timeperiod, takes network resources and battery power.During the redial some options (if not all) of thecalling phone are disabled (for example no newphone call can be made to another number, and whileactually dialing, no incoming calls can be received).Voice mail is sometimes possible but then the reply isinitiated from the user of the called phone who ischarged for it.
In such a case, when the called phone is turned off,unreachable or busy, a simple...