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Selective system scan for multizone radiotelephone subscriber units

  • US 4,905,301 A
  • Filed: 07/28/1988
  • Issued: 02/27/1990
  • Est. Priority Date: 07/28/1988
  • Status: Expired due to Term
First Claim
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1. A radiotelephone subscriber unit having the capacity for operating into more than one radiotelephone system, each radiotelephone system having a plurality of radio coverage areas with at least one control channel and at least one access channel each associated with one radiotelephone system and located in each of the plurality of radio coverage areas, each control channel transmitting a system identification unique to its associated radiotelephone system, the subscriber unit comprising:

  • means for selecting one control channel, detecting the transmitted control channel system identification, and storing said control channel system identification;

    means, responsive to said means for selecting, detecting, and storing, for selecting one of the access channels;

    means for detecting an overhead data message transmitted on said selected one access channel;

    means for reading an access channel system identification from said detected overhead data message;

    means for comparing said access channel system identification with said stored control channel system identification; and

    means for seizing a channel if said comparison of said access channel system identification and said control channel system identification substantially yields a latch.

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