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METHOD AND APPARATUS FOR MAINTAINING UPLINK SYNCHRONIZATION AND REDUCING BATTERY POWER CONSUMPTION

  • US 20070230394A1
  • Filed: 03/22/2007
  • Published: 10/04/2007
  • Est. Priority Date: 03/24/2006
  • Status: Active Grant
First Claim
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1. In a wireless communication system including a wireless transmit/receive unit (WTRU) and a Node-B, a method for maintaining uplink synchronization while the WTRU is in an active state, the method comprising:

  • the Node-B sending a polling message to the WTRU;

    the WTRU sending an uplink synchronization burst to the Node-B based on the polling message;

    the Node-B estimating an uplink timing shift based on the uplink synchronization burst;

    the Node-B sending an uplink timing adjustment command to the WTRU; and

    the WTRU adjusting uplink timing based on the uplink timing adjustment command.

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