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Method of transmitting terminating call signals within a restricted duration and a base station and a portable unit for use in the same

  • US 4,736,461 A
  • Filed: 02/12/1987
  • Issued: 04/05/1988
  • Est. Priority Date: 02/29/1984
  • Status: Expired due to Term
First Claim
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1. A portable unit responsive to a sequence of terminating call signals repeatedly supplied to said portable unit and periodically put by a controllable battery saver circuit into transient active and inactive states during a first time interval and during a second time interval following said first time interval with battery saving operation transiently released and carried out in said battery saver circuit, respectively, said portable unit being kept in a continuous active state when one of said terminating call signals is received during said first time interval and comprising receiving means coupled to said battery saver circuit for carrying out reception operation of radio signals including said terminating call signals, wherein the improvement comprises:

  • means coupled to said receiving means for producing a presence signal representative of the presence of said terminating call signals by measuring an intensity of said radio signals; and

    means for supplying said presence signal to said battery saver circuit to make said controllable battery saver circuit release said battery saving operation.

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