Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-07-31
2000-02-15
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455552, H04B 100
Patent
active
060263008
ABSTRACT:
A method for service acquisition after call release in a dual mode mobile telephone relies upon protocol versions data stored in the mobile telephone to determine whether a digital control channel is available. Each time the mobile telephone is assigned by the base station to a new traffic channel, whether during call establishment or during a hand-off, the mobile telephone stores protocol version data which is broadcast on the newly assigned channel. After a call release, the mobile telephone uses the stored protocol version data to determine whether a digital control channel is available in the channel band occupied by the last used communications channel. If no digital control channel is available, the mobile station will scan for a suitable analog control channel and acquire service immediately on the analog control channel without waiting for a pointer to a digital control channel.
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Aoki Makoto
Eisenzopf Reinhard J.
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