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System and method for managing subscriber unit location information in an integrated communication network

  • US 5,790,953 A
  • Filed: 08/22/1995
  • Issued: 08/04/1998
  • Est. Priority Date: 08/22/1995
  • Status: Expired due to Term
First Claim
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1. A method of operating a subscriber unit to register the subscriber unit in an integrated communication system having a plurality of subsystems capable of operating independently including at least one outbound subsystem capable of communicating to the subscriber unit on an outbound frequency channel and at least one inbound subsystem capable of receiving communications from the subscriber unit on an inbound frequency channel, said method comprising:

  • storing a list of preferred outbound subsystems, said list being ordered according to the preference of said subscriber unit using an outbound subsystem as an outbound home subsystem to which said subscriber unit registers;

    identifying the most preferred outbound subsystem in said list covering an area in which said subscriber unit is located as the subscriber unit'"'"'s outbound home subsystem, wherein said step of identifying the subscriber unit'"'"'s outbound home subsystem includes the step of receiving subsystem information from at least one transmitter unit in a zone of an outbound subsystem, said subsystem information including zone identification information identifying said zone of the outbound subsystem and further including the steps of storing information representing the zone identified in said subsystem information received from the outbound subsystem identified as the subscriber unit'"'"'s outbound home subsystem;

    comparing a zone identified in subsystem information received from a subsequently identified outbound home subsystem to said stored zone information; and

    communicating updated information to said subsequently identified outbound home subsystem if said zone identified in said subsystem information received for said subsequently identified outbound home subsystem is not the same as said stored zone information; and

    communicating registration information to said identified outbound home subsystem to register said subscriber unit in said identified outbound home subsystem.

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