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Method for locating a communication unit within a multi mode communication system

  • US 5,218,716 A
  • Filed: 11/05/1990
  • Issued: 06/08/1993
  • Est. Priority Date: 11/05/1990
  • Status: Expired due to Fees
First Claim
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1. In a geographic region that contains at least one trunking communication system and at least one cellular communication system, wherein the at least one trunking communication system and the at least one cellular communication system have substantially overlapping coverage areas, wherein the at least one trunking communication system is operably coupled to the at least one cellular communication system, wherein at least some of a plurality of communication units are located within the geographic region, and wherein the at least some of the plurality of communication units are affiliated with the at least one trunking communication system and are operable in either the at lest one trunking communication system or the at least one cellular communication system, a method for locating a particular communication unit of the at least some of the plurality of communication units within the geographic region, the method comprises the steps of:

  • a) transmitting, by a communication channel controller of the at least one trunking communication system, a location request message to the particular communication unit;

    b) upon receiving the location request message, transferring affiliation of the particular communication unit from the at least one trunking communication system to the at least one cellular communication system;

    c) transmitting, by the particular communication unit, a location message on a control channel of a cell within the at least one cellular communication system;

    d) transferring the location message from the at least one cellular communication system to a communication channel controller of the at least one trunking communication system, ande) determining, by the communication channel controller, the particular communication unit'"'"'s location based upon the cell of the at least one cellular communication system wherein the particular communication unit transmitted the location message.

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