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Multiple zone communications system and method

  • US 3,898,390 A
  • Filed: 05/15/1973
  • Issued: 08/05/1975
  • Est. Priority Date: 05/15/1973
  • Status: Expired due to Term
First Claim
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1. A method for establishing telephone communications between a fixed station and a mobile unit within a service area comprising the steps of:

  • a. establishing a plurality of overlapping zones which together define a service area, each of said zones including a fixed station serving that zone;

    b. assigning a plurality of commuNication channels to each of the fixed stations serving the zones, the plurality of channels assigned to fixed stations serving adjacent zones being noninterfering and at least some of the plurality of channels being assigned to more than one fixed station;

    c. initially monitoring, at the mobile unit, a predetermined one of the plurality of channels assigned to a first fixed station serving a first zone from which the mobile unit receives a signal having a received level above a predetermined value;

    d. determining that the monitored one of the plurality of channels has been assigned for two-way communications; and

    e. monitoring in response to the determination a predetermined one of the plurality of channels assigned to a second fixed station serving a zone other than the first zone served by the fixed station so that a call can be established between the second fixed station and the mobile unit.

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