Portable communications and data terminal having multiple modes of operation
First Claim
1. A telephone handset that communicates with analog cellular signals and with cellular digital packet data (CDPD) signals over frequency channels, comprising:
- analog cellular signal circuitry that transceivers analog cellular signals;
CDPD signal circuitry that transceivers CDPD signals;
a discriminating circuit that discriminates between analog cellular signals and CDPD signals; and
a control processor, coupled to the discriminating circuit, that controls the analog cellular signal circuitry and the CDPD signal circuitry such that the CDPD signals are transceived over the same frequency channels as the analog cellular signals, wherein the analog cellular signal circuitry and the CDPD signal circuitry are operatively coupled to a single, common radio frequency transceiver, wherein the radio frequency transceiver is responsive to the control processor, and wherein the discriminating circuit is responsive to a difference in paging signals that contain information about analog cellular signals and paging signals that contain information about CDPD signals to cause the control processor to switch between the analog cellular signal circuitry and the CDPD signal circuitry.
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Abstract
A portable radio telephone handset includes the capability of operating as a data transfer terminal as well as an analog cellular telephone subscriber station. Two modes of operation are available in the handset, an analog cellular communication mode and a Cellular Digital Packet Data (CDPD) mode. A paging function for incoming analog cellular communication is carried out on a CDPD channel. The handset distinguishes between paging signals identifying CDPD mode communications and paging signals identifying analog cellular communications. The handset automatically preempts CDPD communications in favor of analog cellular communications such as those carried out in an AMPS configuration.
122 Citations
6 Claims
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1. A telephone handset that communicates with analog cellular signals and with cellular digital packet data (CDPD) signals over frequency channels, comprising:
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analog cellular signal circuitry that transceivers analog cellular signals;
CDPD signal circuitry that transceivers CDPD signals;
a discriminating circuit that discriminates between analog cellular signals and CDPD signals; and
a control processor, coupled to the discriminating circuit, that controls the analog cellular signal circuitry and the CDPD signal circuitry such that the CDPD signals are transceived over the same frequency channels as the analog cellular signals, wherein the analog cellular signal circuitry and the CDPD signal circuitry are operatively coupled to a single, common radio frequency transceiver, wherein the radio frequency transceiver is responsive to the control processor, and wherein the discriminating circuit is responsive to a difference in paging signals that contain information about analog cellular signals and paging signals that contain information about CDPD signals to cause the control processor to switch between the analog cellular signal circuitry and the CDPD signal circuitry. - View Dependent Claims (2, 3, 4, 5)
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6. A telephone handset that communicates with analog cellular signals and with cellular digital packet data (CDPD) signals over frequency channels, comprising:
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analog cellular signal circuitry that transceivers analog cellular signals;
CDPD signal circuitry that transceivers CDPD signals;
a discriminating circuit that discriminates between analog cellular signals and CDPD signals;
a control processor, coupled to the discriminating circuit, that controls the analog cellular signal circuitry and the CDPD signal circuitry such that the CDPD signals are transceived over the same frequency channels as the analog cellular signals, and further comprising a scratch pad memory connected to the control processor, the scratch pad memory comprising a static random access memory providing scratch pad input to the control processor.
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Specification