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Wireless terminal having digital radio processing with automatic communication system selection capability

  • US 5,655,003 A
  • Filed: 09/18/1995
  • Issued: 08/05/1997
  • Est. Priority Date: 09/18/1995
  • Status: Expired due to Term
First Claim
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1. A wireless radio telephone terminal with digital radio processing and having equipment for determining an existence of and accessing selected communication systems from a plurality of wireless communication systems;

  • comprising;

    an antenna for interfacing with an air interface of the wireless communication systems;

    acoustic input/out devices for audio communications with a user of the wireless terminal;

    programmable processor means for processing radio signals digitally;

    first and second analog-digital conversion means each connecting the programmable processor means to the antenna and acoustic devices, respectively;

    a stored program storage source connected to the programmable processor means and including stored instructions for controlling signal processing in the programmable processor means;

    the stored instructions including;

    the steps ofupon power up performing a plurality of preselected automatic interrogation steps for determining the presence of specified air interface systems of differing communication systems;

    acknowledging the presence of existing ones of the specified air interface systems;

    setting operating characteristics of the wireless terminal to operate in one of the specified air interface systems;

    monitoring paging signals and determining operating features desired;

    accessing the desired system and monitoring call process, andterminating at call completion.

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