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System for routing calls to mobile subscribers

  • US 5,526,400 A
  • Filed: 04/01/1994
  • Issued: 06/11/1996
  • Est. Priority Date: 04/01/1994
  • Status: Expired due to Term
First Claim
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1. A method for the automatic routing of calls within a cellular telecommunication network divided into a plurality of local access and transport areas (LATAs), the network including a plurality of exchanges within which mobile subscribers are located, the exchanges connected to one another by both signaling data lines and voice circuits wherein calls incoming to a gateway exchange are routed to terminating subscribers within other exchanges, and the network including a pre-routing call setup functional capability of locating a terminating subscriber on a voice channel by means of signals sent entirely over said signaling data lines and prior to seizing a voice circuit and routing the call from the gateway exchange to the exchange where the terminating subscriber is currently located, said method comprising:

  • determining the LATA within which a call to be routed to a terminating subscriber originates;

    determining the LATA within which the terminating subscriber is located;

    comparing the originating LATA and the terminating LATA at the exchange where the terminating subscriber is currently located;

    routing the call from the originating subscriber to the terminating subscriber through the network by enabling said prerouting call setup functional capability in response to the originating LATA and terminating LATA being the same, and disabling said prerouting call setup functional capability in response to the originating LATA and terminating LATA being different so that once the called mobile station is identified within the exchange where it is currently located by means of the signaling data lines, a voice circuit from the gateway exchange to that exchange is seized while the call is attempted to be completed to the terminating mobile station.

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