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Combined analog and digital cellular telephone system having a secondary set of control channels

  • US 5,119,397 A
  • Filed: 04/26/1990
  • Issued: 06/02/1992
  • Est. Priority Date: 04/26/1990
  • Status: Expired due to Term
First Claim
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1. A method for operating a mobile station to establish communication connections over control channels between a mobile station and a land system designed for digital traffic channels only, comprising the steps of:

  • scanning a primary set of control channels in order to select a first channel generated from a first preferred transmission system;

    reading said first channel of said primary set of control channels;

    detecting a set of indicating bits associated with said first channel;

    determining whether said indicating bits are in an active state or an inactive state, said active state indicating that said first preferred transmission system has digital communication capabilities, said inactive state indicating that said first preferred transmission system has only analog communication capabilities;

    utilizing said primary control channels in response to said indicating bits being in an active state; and

    initiating a scanning of any secondary set of control channels generated from a second preferred transmission system in response to said indicating bits being in an inactive state.

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