초록 ▼

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 se

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.

대표청구항 ▼

[ We claim:] [1.]1. A radio telephone subscriber unit arranged for use in a communication system having a plurality of frequencies divided into a plurality of available frequency bands, said radio telephone subscriber unit including a controller, said controller comprising:(a) means for scanning a c

[ We claim:] [1.]1. A radio telephone subscriber unit arranged for use in a communication system having a plurality of frequencies divided into a plurality of available frequency bands, said radio telephone subscriber unit including a controller, said controller comprising:(a) means for scanning a cellular digital packet data (CDPD) radio frequency for a list of system identification numbers (SID) where each SID is associated with one of a plurality of available radio frequency bands;(b) means for comparing said scanned SIDs to a list of preferred SIDs stored in said radio telephone subscriber unit;(c) means for selecting a single scanned SID based upon said list of preferred SIDs stored in said radio telephone subscriber unit; and(d) means for acquiring a radio frequency carrier corresponding to a radio frequency band of said selected single scanned SID.