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Remote wireless unit having reduced power operating mode for a discrete multitone spread spectrum communications system

  • US 6,347,236 B1
  • Filed: 02/24/1997
  • Issued: 02/12/2002
  • Est. Priority Date: 02/06/1997
  • Status: Expired due to Term
First Claim
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1. In a wireless communications network, a method in a base station to communicate with a remote unit that is in a sleep mode, the remote unit having a unique identification value, comprising the steps of:

  • establishing a periodic reference instant at the base station and at the remote station;

    determining a delay interval following said periodic reference instant at the base station, said delay interval being derived from said unique identification value of said remote unit; and

    transmitting a message from the base station to the remote unit at a second instant following said delay interval, said remote unit having changed from said sleep mode to a standby mode after said delay interval;

    wherein said periodic reference instant is established by a beginning subframe count instant that is incremented by a packet count value at the base station and at the remote unit.

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