Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-06-12
1998-06-30
Britton, Howard
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455144, 455455, H04B 726, H04Q 702, H04Q 902
Patent
active
057748071
ABSTRACT:
A control channel is searched for call waiting in a mobile station where the power supply for a receiving circuit is turned off during a break time of receiving level measurements, wherein in a first control channel selection mode, all the control channels are divided into a plurality of groups, the receiving levels of the control channels are measured group by group intermittently and sequentially. The intermittent measurement of these groups are repeated until a control channel having a receiving level equal to or greater than a first predetermined value is detected. When a receiving level equal to or greater than the first predetermined value is detected, the receiving levels of all the control channels are measured in a second control channel selection mode.
REFERENCES:
patent: 5109390 (1992-04-01), Gilhousen
patent: 5119397 (1992-06-01), Dahlin
patent: 5212803 (1993-05-01), Uddenfeldt
patent: 5257400 (1993-10-01), Yoshida
patent: 5396645 (1995-03-01), Huff
patent: 5530910 (1996-06-01), Taketsugu
Chiba Kouji
Sawayanagi Shigehide
Tokuhiro Norihito
Yazaki Hidetoshi
Yunoki Kazufumi
Britton Howard
NTT Mobile Communications Network Inc.
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