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System identification (SID) list for selecting operating frequencies

  • US 5,586,338 A
  • Filed: 12/22/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 12/22/1994
  • Status: Expired due to Term
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 the radio frequencies in all available frequency bands;

    (b) means for recording at least one received system identification number (SID) associated with each of said available frequency bands;

    (c) means for comparing said received SIDs for each said available frequency band to a prioritized list of preferred SIDs stored in said radio telephone subscriber unit;

    (d) means for selecting a single received SID based upon said prioritization of said list of preferred SIDs stored in said radio telephone subscriber unit so that a received SID with a highest prioritization is selected; and

    (e) means for acquiring a radio frequency carrier corresponding to said selected single received SID.

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