Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-03-18
2000-01-18
Le, Thanh Cong
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
H04Q 700
Patent
active
060164271
ABSTRACT:
A method and an apparatus for selecting a cellular carrier frequency for accessing cellular airtime services based upon a list of preferred system identification codes (SIDs). A cellular telephone is programmed to accept into memory a list of preferred SIDs corresponding to carriers through which service is preferred. While any SID remains in a preferred list, the standard A/B system selection function is replaced by a substitute system selection function which includes only three carrier selection modes including the Home Only mode, the SID Only mode, and a Roam Saver mode. With the Roam Saver carrier selection mode, the cellular telephone first prefers service through a home carrier and then through a carrier broadcasting a SID matching a SID on the preferred list, but never denies service to emergency or non-emergency destinations if any SID is detected. Status indicators are used to, among other purposes, differentiate between no service being available, service being available through a carrier broadcasting a home SID, a preferred SID, or a non-preferred available SID. Also, in addition to multiple number assignment modules (NAMs) being included to support subscriptions to services from multiple carriers, the user is provided the option of manually selecting which NAM is used or enabling the cellular telephone, through an auto-NAM function, to automatically select and use the NAM of any home carrier detected by the cellular telephone.
REFERENCES:
patent: 4734928 (1988-03-01), Weiner et al.
patent: 4736453 (1988-04-01), Schloemer
patent: 4742560 (1988-05-01), Arai
patent: 4775999 (1988-10-01), Williams
patent: 4833701 (1989-05-01), Comroe et al.
patent: 4833702 (1989-05-01), Shitara et al.
patent: 4903320 (1990-02-01), Hanawa
patent: 4905301 (1990-02-01), Krolopp et al.
patent: 4916728 (1990-04-01), Blair
patent: 4965850 (1990-10-01), Schloemer
patent: 4972355 (1990-11-01), Mullins
patent: 5020091 (1991-05-01), Krolopp et al.
patent: 5020093 (1991-05-01), Pireh
patent: 5097499 (1992-03-01), Cosentino
patent: 5101500 (1992-03-01), Mauri
patent: 5442806 (1995-08-01), Barber et al.
patent: 5448622 (1995-09-01), Huttunen
patent: 5504939 (1996-04-01), Mayrand et al.
patent: 5784693 (1998-07-01), Barber
"Cellular Mobile Telephone by Motorola" Model 820, 1989; America Series.
"Your Portable Connection" America Series 865.
Nokia LXTIC Car-To-Car/Transferable--With Battery Option, May 1990.
Barber Clifton J.
Hardin Stephen T.
Cong Le Thanh
Oki Telecom, Inc.
LandOfFree
Preferred carrier selection method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Preferred carrier selection method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Preferred carrier selection method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-569324