Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-04-16
2000-03-07
Nguyen, Lee
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455435, 455515, H04Q 720
Patent
active
060351942
ABSTRACT:
A method is disclosed for operating a mobile station (10), including the steps of, after registering with a first system and camping on a control channel of the first system, (a) leaving the control channel of the first system and sending a registration request to a second system; (b) determining if a registration response is received from the second system; and, if the registration response is not received from the second system, (c) setting a flag. The method further includes the steps of (d) locating a control channel of the first system; (e) testing the state of the flag to determine if it is set; and, if the flag is set, (f) sending a registration request to the first system. In one embodiment of this invention the first system is a digital system, and the second system is an analog system. In another embodiment of this invention the first system is a digital system, and the second system is a digital system, while in a further embodiment the first system is an analog system, and the second system is a digital system. Also, in one case the registration response is a Registration Order Confirmation, while in another case the registration response is one of a Registration Accept or a Registration Reject. In an IS-136 embodiment of this invention the flag being set is used to trigger an ACC to DCCH Transition Condition, or a Hyperband Transition Condition, when in the DCCH Camping state, and thus causes the Registration procedure to be invoked.
REFERENCES:
patent: 5903839 (1999-05-01), Mattila
patent: 5953665 (1999-09-01), Mattila
Nguyen Lee
Nokia Mobile Phones Limited
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