Method of selecting the cellular system with which a cellular mobile radiotelephone communicates
First Claim
1. A method of selecting upon which one of a plurality of frequency sets a cellular mobile radiotelephone (CMR) communicates, said method comprising the steps of:
- storing a list of system identification numbers (SIDs) that identify cellular base systems for which cellular radiotelephone communication with said CMR is to be prohibited;
detecting when said CMR is roaming;
when said CMR is roaming, obtaining a SID for the cellular system upon which said CMR is currently configured to operate, said cellular system communicating upon a first one of said sets of frequencies;
determining whether said SID is identified by said list; and
when said SID is identified by said list, instructing said CMR to communicate upon a second one of said sets of frequencies.
2 Assignments
0 Petitions
Accused Products
Abstract
A remotely programmable cellular mobile radiotelephone (CMR 12) is configured to select (1300) a cellular system (14-16) with which to communicate while roaming. The CMR (12) utilizes a default system selection process. The system selected using this default process is identified (1302) and a SID list (1402) is checked to see if the system identification number (SID) of the identified system is on the list (1402). The SID list (1402) is maintained in a current state through remote programming sessions (1500). When the default system'"'"'s SID is not on the list (1402), CMR (12) operation continues normally. When the default system'"'"'s SID is on the SID list (1402), the default system selection process is replaced with an alternate system selection process (1316-1322). If a new system selected by the alternate process is not available or if a new system is available but listed on the SID list (1402), then the CMR (12) simulates a no service mode of operation (1332-1338). Simulation of a no service mode of operation ceases when an actual no service condition occurs (1222). If a new system selected by the alternate selection process is available and not listed on the SID list (1338), then operation on the new system is permitted. After a predetermined duration of operation on the new system, the default selection process is restored and the procedure repeats if necessary.
326 Citations
22 Claims
-
1. A method of selecting upon which one of a plurality of frequency sets a cellular mobile radiotelephone (CMR) communicates, said method comprising the steps of:
-
storing a list of system identification numbers (SIDs) that identify cellular base systems for which cellular radiotelephone communication with said CMR is to be prohibited; detecting when said CMR is roaming; when said CMR is roaming, obtaining a SID for the cellular system upon which said CMR is currently configured to operate, said cellular system communicating upon a first one of said sets of frequencies; determining whether said SID is identified by said list; and when said SID is identified by said list, instructing said CMR to communicate upon a second one of said sets of frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of preventing a cellular mobile radiotelephone (CMR) that is capable of performing a plurality of cellular system selection processes from operating upon a predetermined set of cellular systems, said method comprising the steps of:
-
periodically receiving data at said CMR, said data identifying at least one cellular system; storing said data in a list within a memory portion of said CMR; performing a first one of said cellular system selection processes to select a first cellular system upon which said CMR may operate; obtaining a system identification number (SID) of said first cellular system; comparing said SID against said list to determine whether said CMR is prevented from operating upon said first cellular system; and when said comparing step determines that said CMR is prevented from operating upon said first cellular system, performing a second one of said cellular system selection processes. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A method of selecting upon which one of a plurality of frequency sets a cellular mobile radiotelephone (CMR) communicates, said method comprising the steps of:
-
periodically receiving data, said data being received at said CMR over one of said plurality of sets of frequencies; storing said data in a list of system identification numbers (SIDs) that identify cellular systems for which cellular radiotelephone communication with said CMR is to be prohibited, said receiving and storing steps operating to maintain said list in a current state; detecting when said CMR is roaming; when said CMR is roaming, obtaining a SID for the cellular system upon which said CMR is currently configured to operate, said cellular system communicating upon a first one of said sets of frequencies; determining whether said SID is identified by said list; when said SID is identified by said list, instructing said CMR to communicate upon a second one of said sets of frequencies; determining whether communication services are available over said second frequency set; when said communication services are available, getting a SID for a second cellular system which communicates using said second frequency set; inquiring whether said second system SID is identified by said list; when said second system SID is not identified by said list, waiting a predetermined period of time, then instructing said CMR to communicate upon said first set of frequencies; and repeating said obtaining, and determining steps. - View Dependent Claims (22)
-
Specification