Use of cellular digital packet data (CDPD) communications to con

Details Use of cellular digital packet data (CDPD) communications to con Use of cellular digital packet data (CDPD) communications to con

1995-12-04

1999-07-06

Cumming, William

Telecommunications

Radiotelephone system

Auxiliary data signaling

H04Q 732

Patent

active

059208210

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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