Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1998-09-30
2000-12-05
Cumming, William
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455 63, 370331, H04Q 720, H04Q 700, H04B 110, H04B 1500
Patent
active
061578363
ABSTRACT:
A portable radio telephone handset operates as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode, are available in the handset. The handset distinguishes between paging signals indicating CDPD mode communications and those indicating analog cellular communications. The handset also automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration. The handset maintains an active status on a CDPD communication channel during a "sleep mode", when the handset can carry out AMPS activity.
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Cumming William
Pacific Communication Sciences, Inc.
Rutkowski Peter J.
Shaw Steven A.
Stewart David L.
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