Use of cellular digital packet data (CDPD) communications to convey system identification list data to roaming cellular subscriber stations
First Claim
1. A system for downloading data to radio telephone subscriber units, said system comprising:
- (a) control means for updating at least one data list to be downloaded to said radio telephone subscriber units and generating a version number corresponding to a most-current data list;
(b) means for broadcasting said version number to said radio telephone subscriber units on a cellular digital packet data (CDPD) frequency;
(c) means in each of said radio telephone subscriber unit for receiving said version number;
(d) means in each of said radio telephone subscriber unit for comparing said received version number to a version number previously stored in each of said radio telephone subscriber units; and
(e) means in each of said radio telephone subscriber unit for initiating via a CDPD channel a download of said data list based upon said comparison of said version numbers.
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0 Petitions
Accused Products
Abstract
An analog cellular voice telephone system and subscriber stations associated therewith are controlled to conserve power and to provide alternate service carriers. Acquisition of all of the service carriers is facilitated through the use of system identification numbers (SIDs) associated with each service carrier. A roaming subscriber will tune to a cellular digital packet data (CDPD) frequency to obtain a list of service carriers operating within that geographical area. Based upon a comparison with a preferred SID list stored in the subscriber station, an available service carrier will be selected by the subscriber station, and registration with the selected service carrier will take place. Usually, analog voice communication is suspended until the selection process takes place.
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Citations
20 Claims
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1. A system for downloading data to radio telephone subscriber units, said system comprising:
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(a) control means for updating at least one data list to be downloaded to said radio telephone subscriber units and generating a version number corresponding to a most-current data list; (b) means for broadcasting said version number to said radio telephone subscriber units on a cellular digital packet data (CDPD) frequency; (c) means in each of said radio telephone subscriber unit for receiving said version number; (d) means in each of said radio telephone subscriber unit for comparing said received version number to a version number previously stored in each of said radio telephone subscriber units; and (e) means in each of said radio telephone subscriber unit for initiating via a CDPD channel a download of said data list based upon said comparison of said version numbers. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for downloading data to radio telephone subscriber units, said system comprising:
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(a) control means for updating a data list to be downloaded to said radio telephone subscriber units and for generating a version number corresponding to said data list; (b) means for broadcasting said version number over a cellular digital packet data (CDPD) channel; (c) means for downloading said data list to said radio telephone subscriber units within range of said means for downloading; and (d) means for sequentially addressing each of said radio telephone subscriber units in range of said means for downloading data via a CDPD channel, and for initiating download of said data list to said radio telephone subscriber units. - View Dependent Claims (8, 9)
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10. A method of downloading data to radio telephone subscriber units, comprising:
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(a) generating a data list and a version number corresponding to said data list; (b) broadcasting said version number to a plurality of said radio telephone subscriber units via a cellular digital packet data (CDPD) channel; (c) comparing a received version number to a pre-stored version number in each of said radio telephone subscriber units; and (d) initiating a download via a CDPD channel of said data list to any radio telephone subscriber unit in which a pre-stored version number does not correspond to said received version number. - View Dependent Claims (11, 12)
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13. A method of selecting a system provider for radio telephone communication on at least one of a plurality of radio frequency bands by a radio telephone subscriber unit, said method comprising the steps of:
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(a) scanning a cellular digital packet data (CDPD) channel for a list of system identification numbers (SIDS) where each SID is associated with each of a plurality of available radio frequency bands; (b) comparing said scanned SIDs to a list of preferred SIDs stored in said radio telephone subscriber unit; (c) selecting a single scanned SID based upon said list of preferred SIDs stored in said radio telephone subscriber unit; and (d) acquiring a radio frequency carrier corresponding to a control channel of said selected single scanned SID. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification