Use of cellular digital packet data (CDPD) communications to convey system identification list data to roaming cellular subscriber stations

  • US 6,246,875 B1
  • Filed: 03/26/1999
  • Issued: 06/12/2001
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Fees
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First Claim
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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.

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