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Connection method of digital cordless telephone apparatus

  • US 5,737,325 A
  • Filed: 12/07/1995
  • Issued: 04/07/1998
  • Est. Priority Date: 12/09/1994
  • Status: Expired due to Term
First Claim
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1. A connection method of a digital cordless telephone apparatus which includes a base unit and a plurality of portable units, in which one channel is divided into frames in view of time, each frame being formed of a plurality of transmission slots and a plurality of reception slots, in which digital data is transmitted and received during respective periods of said transmission slots and said reception slots, and in which by using said plurality of transmission slots and reception slots in each of said frames, said base unit can communicate with said plurality of portable units and provide communication between one portable unit and another portable unit of said plurality of portable units via said base unit, said connection method being used to establish a connection for communication between a first calling side portable unit and a second called side portable unit of said plurality of portable units, comprising the steps of:

  • at said first portable unit, transmitting an access request signal for requesting a call to said second portable unit;

    at said base unit receiving the access request signal and determining whether there are any transmission slots and reception slots available for connecting said first portable unit to said second portable unit via said base unit;

    if there are any available transmission slots and reception slots, allowing a call between said first portable unit and said second portable unit by using the available slots;

    if there are no available transmission slots and reception slots, transmitting a control signal including busy information;

    at said first portable unit;

    determining whether it is possible to receive the control signal from said base unit;

    if said first portable unit can receive the control signal receiving the control signal and transmitting to said second portable unit a direct access request signal for requesting a call to said second portable unit; and

    at said second portable unit, receiving the direct access request signal, thereby communicating with said first portable unit.

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