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Intersystem group call communication system and method

  • US 5,095,529 A
  • Filed: 05/30/1989
  • Issued: 03/10/1992
  • Est. Priority Date: 05/30/1989
  • Status: Expired due to Term
First Claim
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1. In a communication system that includes:

  • a first communication system that includes a first set of communication resources, and first resource control means for controlling, at least in part, allocation of the first set of communication resources amongst a first plurality of member communication units; and

    a second communication system that includes a second set of communication resources, and second resource control means for controlling, at least in part, allocation of the second set of communication resources amongst a second plurality of member communication units, wherein the first set of communication resources are substantially noncompatible with the second set of communication resources;

    a method of establishing communications between;

    a first communication unit that is a member of the first plurality of member communication units and that is located within the first communication system; and

    a second communication unit that is a member of the first plurality of member communication units and that is located within the second communication system;

    the method comprising the step of;

    A) providing at least some of the communication units in the first plurality of member communication units, including the first and second communication units, with a commonly shared ID;

    B) pre-registering the commonly shared ID with the second communication system as a roaming ID;

    C) providing the second communication system with receiver means substantially compatible with at least one of the communication resources of the first communication system to allow the second communication system to monitor at least some communications supported by the first communication system;

    D) determining, in the second communication system, that the second communication unit is located within the second communication system;

    E) monitoring, in the second communication system using the receiver means, at least one communication resource belonging to the first set of communication resources to detect a first system communication intended, at least in part, for communication units that have at least the commonly shared ID;

    F) when the first system communication is detected, allocating in the second communication system a communication resource from the second set of communication resources to be used by the second communication unit to receive at least part of the first system communication.

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