Method and apparatus for concurrent monitoring of divergent wireless telecommunication systems
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United States of America Patent
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Nov 30, 2004
Issued Date -
N/A
app pub date -
Sep 11, 1998
filing date -
Jun 7, 1995
priority date (Note) -
Expired
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Abstract
A portable communications subscriber unit operates as a data transfer terminal as well as an analog cellular telephone M-ES. Two modes of operation, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode, are available in the subscriber unit. The subscriber unit distinguishes between paging signals indicative of a CDPD mode of communication and those indicative of an analog cellular mode of communication. The subscriber unit automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS system. The present inventive method enables the subscriber unit to remain registered in the CDPD communication system using a CDPD 'sleep mode' while performing activities on the AMPS system. Another aspect of the present invention facilitates the automatic switching of subscriber unit displays to correspond to the communication system with which the unit is presently communicating.
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