Use of cellular digital packet data (CDPD) communications to convey system identification list data to roaming cellular subscriber stations
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…
Original patent title: “Use of cellular digital packet data (CDPD) communications to convey system identification list data to roaming cellular subscriber stations”
What this patent covers
The actual claim
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.
What this patent does NOT cover
The boundaries
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Patent Abstract
Patent 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.
Patent Journey
From filing to expiry
Patent Filed
1995
Patent Granted
1999 · 4yr after filing
Highly Cited
179 patents cite this
Patent Expired
2015
PatentBrief Score
Impact Score
Moderate
Citation count
40/40
Highly cited
Claim breadth
16/20
Broad claims
Recency
0/20
Older than 20 years
Assignee scale
0/20
Independent or smaller assignee
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
The original legal language
Original claims
24 claims as filed with the patent office.
Citations
Patent lineage
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