Beacon system using cellular digital packet data (CDPD) communication for roaming cellular stations
First Claim
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1. A control system for a plurality of participating radio telephone subscriber units, comprising:
- (a) means for broadcasting on a cellular digital packet data (CDPD) channel a list of System Identification Numbers (SIDs) for each service provider operating within range of said means for broadcasting;
(b) means in each said participating radio telephone subscriber unit for automatically tuning to said CDPD channel when said radio telephone subscriber unit is roaming; and
(c) means in each said radio telephone subscriber unit for initiating an analog cellular voice communication operation responsive to said SID list received from said means for broadcasting.
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Accused Products
Abstract
A cellular telephone system is upgraded by modifying subscriber units for selective service provider acquisition during roaming. Priority of acquisition is given to those service providers associated with the home service provider. These preferred service providers are identified by system identification (SIDs) numbers. A roaming subscriber unit will tune to a single beacon frequency identifying cellular digital packet data (CDPD) frequencies from which the subscriber unit will select one CDPD frequency corresponding to a service provider operating in the geographic area to which the subscriber has roamed.
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Citations
20 Claims
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1. A control system for a plurality of participating radio telephone subscriber units, comprising:
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(a) means for broadcasting on a cellular digital packet data (CDPD) channel a list of System Identification Numbers (SIDs) for each service provider operating within range of said means for broadcasting; (b) means in each said participating radio telephone subscriber unit for automatically tuning to said CDPD channel when said radio telephone subscriber unit is roaming; and (c) means in each said radio telephone subscriber unit for initiating an analog cellular voice communication operation responsive to said SID list received from said means for broadcasting. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method to provide a system control data to a plurality of participating radio telephone subscriber units operating in a wireless communication system having at least one beacon broadcasting on a single predetermined frequency, the method of operating comprising the steps of:
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(a) tuning a participating radio telephone subscriber unit to said single predetermined frequency to receive first data; (b) responsive to said first data tuning said participating radio telephone subscriber unit to a cellular digital packet data (CDPD) channel; (c) receiving data on said CDPD channel, including a list of system identification numbers (SIDs); and (d) registering for use of an analog cellular voice channel responsive to a comparison of said received SID list with a pre-programmed SID list stored in said participating radio telephone subscriber unit. - View Dependent Claims (13, 14, 15)
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16. A radio telephone subscriber unit arranged for use in a communication system having at least one beacon operating at a predetermined frequency, and a plurality of broadcast sources operating on cellular digital packet data (CDPD) channels, said radio telephone subscriber unit comprising:
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(a) means for automatically tuning to said predetermined beacon frequency to obtain beacon data; (b) means for tuning to a CDPD channel responsive to said beacon data; (c) means for downloading system data using said CDPD channel; (d) means for comparing said downloaded system data with pre-programmed data in said radio telephone subscriber unit; and
, (e) means for registering with said communication system responsive to said comparison. - View Dependent Claims (17, 18, 19, 20)
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Specification