Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-05-16
1999-07-13
Chin, Wellington
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455422, 455426, 455434, 455552, H04Q 720
Patent
active
059240385
ABSTRACT:
A method is disclosed for operating a mobile station, the method including a first step of storing information in the mobile station, the stored information indicating a frequency of a digital control channel of at least one public cellular communications system in the vicinity of an autonomous communications system. The stored information further specifies a frequency channel associated with the autonomous communications system. The autonomous communications system is one of a private system or a residential system. A second step is executed upon a termination of a call using an analog voice channel or a digital traffic channel of a public cellular communications system, wherein the mobile station receives a message from the public cellular communications system, the received message including information indicating a frequency of a digital control channel of the public cellular communications system. A third step of the method compares the information of the received message with the stored information to determine if a match exists between the digital control channels. If a match is found to exist, it is determined that the mobile station is operating in a public cellular communications system that is in the vicinity of the autonomous communications system. In this case the mobile station attempts to tune to a control channel of the autonomous wireless communications system, using the stored information that further specifies a frequency associated with the autonomous communications system.
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Chin Wellington
Nokia Mobile Phones Limited
Woldetatios Yemane
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