Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1997-03-31
1999-12-28
Vo, Nguyen
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455452, 455509, 455512, H04B 700
Patent
active
060093315
ABSTRACT:
In assignment of radio channels to terminals for communication with a switching office, one of currently idle channels can be assigned to a calling terminal by use of a channel state memory in the office which memory stores channel numbers and terminal information currently using channels. The office further includes a terminal memory for storing the maximum number separately predetermined for each of fixed and mobile types of the terminals assignable to the channels. The calling terminal is rejected to be assigned with any idle channel when the maximum number is equal to the current number of terminals currently using channels which are same as the type of the calling terminal. In another aspect, the terminal memory further stores information that the fixed type has a priority. An idle channel is assigned to a calling one of fixed type terminals even when the maximum number for the fixed type is equal to or smaller than the current number. In other aspect, the channel state memory stores receiving signal strengths at terminals currently using the channels. When a calling is originated from one of fixed type terminals and when all of the channels are currently used, one of the mobile terminals using a specific channel at the lowest one of the receiving signal strengths is forced to release the specific channel, which channel is in turn assigned to the calling fixed type terminal.
REFERENCES:
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patent: 5442807 (1995-08-01), Takayama
patent: 5537684 (1996-07-01), Cassidy et al.
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patent: 5634197 (1997-05-01), Paavonen
patent: 5722078 (1998-02-01), Przelomiec et al.
patent: 5745853 (1998-04-01), Hippelainen
NEC Corporation
Nguyen Duc
Vo Nguyen
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