Apparatus for selecting control channel in mobile communication system
First Claim
1. An apparatus provided in a mobile station for selecting dedicated control channels having a field level in a mobile communication system, said apparatus having a transmitting and receiving circuit, the mobile station being a subscriber to one of two mobile communication systems and can use the service of a nonsubscribed-to system when the service of a subscribed-to system is not available, said apparatus comprising:
- first driving means for driving said transmitting and receiving circuit to scan the dedicated control channels of the subscribed-to system;
detecting means for detecting the field level of the scanned dedicated control channels;
determining means for determining whether at least one of the scanned dedicated control channels has a predetermined field level and is available;
setting means for setting said transmitting and receiving circuit to a state of waiting for an outgoing call and for an incoming call when said determining means determines that one of the dedicated control channels has the predetermined field level and is available;
scan repeat means for driving said transmitting and receiving circuit to continue the scan of the dedicated control channels of the subscribed-to system for a predetermined time when none of the scanned dedicated control channels have the predetermined field level and are available;
second driving means for driving said transmitting and receiving circuit to scan the dedicated control channels of the non-subscribed-to system after said predetermined time has passed.
1 Assignment
0 Petitions
Accused Products
Abstract
In a mobile communication system having two operating systems co-existing in one area, a mobile station having a transmitting and receiving circuit and a control unit for subscribing to one of the two mobile communication systems by selecting a control channel thereof is provided. Accordingly, a normal scan of the control channel of the subscribed-to system is activated, and then an extra scan of the control channel is activated when the control channel is not available during the normal scan. The possibility of an involuntary connection to a non-subscribed-to system is thereby reduced when the mobile station is temporarily in a blind section of the subscribed-to system.
70 Citations
8 Claims
-
1. An apparatus provided in a mobile station for selecting dedicated control channels having a field level in a mobile communication system, said apparatus having a transmitting and receiving circuit, the mobile station being a subscriber to one of two mobile communication systems and can use the service of a nonsubscribed-to system when the service of a subscribed-to system is not available, said apparatus comprising:
-
first driving means for driving said transmitting and receiving circuit to scan the dedicated control channels of the subscribed-to system; detecting means for detecting the field level of the scanned dedicated control channels; determining means for determining whether at least one of the scanned dedicated control channels has a predetermined field level and is available; setting means for setting said transmitting and receiving circuit to a state of waiting for an outgoing call and for an incoming call when said determining means determines that one of the dedicated control channels has the predetermined field level and is available; scan repeat means for driving said transmitting and receiving circuit to continue the scan of the dedicated control channels of the subscribed-to system for a predetermined time when none of the scanned dedicated control channels have the predetermined field level and are available; second driving means for driving said transmitting and receiving circuit to scan the dedicated control channels of the non-subscribed-to system after said predetermined time has passed. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A control unit for a mobile transceiver subscribing to a first mobile communication system, the first system sharing an area common to a second mobile communication system, the second system being able to be accessed by the mobile transceiver, said control unit controlling scanning and selection of communication channels in the first and second systems, said control unit comprising:
-
scanning means for scanning the first system and the second system for available channels; and scan period extending means for extending a scan period of the first system when the mobile transceiver moves into a blind section of coverage area of the first system. - View Dependent Claims (7, 8)
-
Specification