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Preferred carrier selection method for selecting any available cellular carrier frequency when neither home nor preferred cellular carrier frequencies are available

  • US 5,442,806 A
  • Filed: 06/08/1993
  • Issued: 08/15/1995
  • Est. Priority Date: 06/08/1993
  • Status: Expired due to Term
First Claim
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1. A method for selecting a cellular carrier frequency for accessing cellular airtime services, said method comprising the steps of:

  • defining at least one predefined home system identification code (SID) and at least one predefined preferred SID;

    monitoring a plurality of frequencies to detect any SID corresponding to any frequency of the plurality of frequencies, including steps ofmonitoring a plurality of primary carrier frequencies to detect any SID corresponding to any frequency of the plurality of primary carrier frequencies, andmonitoring a plurality of secondary carrier frequencies to detect any SID corresponding to any frequency of the plurality of secondary carrier frequencies;

    selecting a frequency, for calls to ordinary telephone numbers, corresponding to a SID matching said predefined home SID if the SID matching said predefined home SID is detected, including steps ofselecting a primary carrier frequency corresponding to the SID matching said predefined home SID if the SID matching said predefined home SID is detected upon the primary carrier frequency, andselecting a secondary carrier frequency corresponding to the SID matching said predefined home SID if the SID matching said predefined home SID is detected upon the secondary carrier frequency and the SID matching said predefined home SID is not detected upon any primary carrier frequency;

    selecting a frequency, for-calls to ordinary telephone numbers, corresponding to a SID matching said predefined preferred SID ifthe SID matching said predefined preferred SID is detected andno SID matching said predefined home SID is detected; and

    selecting a frequency, for calls to ordinary telephone numbers, corresponding to a SID not matching either said predefined home SID or said predefined preferred SID ifthe SID not matching either said predefined home SID or said predefined preferred SID is detected andno SID matching either said predefined home SID or said predefined preferred SID is detected.

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