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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 4,679,244 A
  • Filed: 02/26/1985
  • Issued: 07/07/1987
  • Est. Priority Date: 02/29/1984
  • Status: Expired due to Term
First Claim
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1. A method of calling a portable unit from a base station through a radio control channel, said method comprising the steps of repeatedly producing in said base station a terminating call signal as a call signal sequence, periodically putting said portable unit into transient active and inactive states during a first time interval and during a second time interval following said first time interval, respectively, and keeping said portable unit into a continuous active state when one of said terminating call signals is received during said first time interval, wherein the improvement comprises the steps of:

  • measuring in said base station a first time duration longer than said second time interval; and

    producing said call signal sequence only within said first time duration.

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