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Digital radio communications apparatus

  • US 7,050,821 B2
  • Filed: 10/28/2003
  • Issued: 05/23/2006
  • Est. Priority Date: 10/29/2002
  • Status: Active Grant
First Claim
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1. Digital radio communications apparatus comprising:

  • a base unit;

    a local handset communicable with said base unit; and

    a distant handset communicable with said base unit,wherein said local handset comprises;

    a radio section for performing radio communications;

    a base unit communications controller for performing radio communications with said base unit;

    a direct inter-handset communications controller for performing direct radio communications between handsets;

    a direct inter-handset communications transition controller for making control to establish direct inter-handset communications while maintaining communications with a base unit as well as transmitting control channels for direct inter-handset communications in vacant slots in the receiving time zones for communications with said base unit; and

    a basic controller for controlling the components of the local handset; and

    saiddistant handset comprises;

    a radio section for performing radio communications;

    a base unit communications controller for performing radio communications with said base unit;

    a direct inter-handset communications controller for performing direct radio communications between handsets;

    a direct inter-handset communications transition controller for making control to establish direct inter-handset communications while maintaining communications with said base unit as well as scanning control channels for direct inter-handset communications in the time zones other than the slots occupied by communications with said base unit; and

    a basic controller for controlling the components of the distant handset.

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