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Uplink timing control

  • US 8,942,150 B2
  • Filed: 03/18/2008
  • Issued: 01/27/2015
  • Est. Priority Date: 03/19/2007
  • Status: Active Grant
First Claim
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1. A method for acquiring a time adjustment at a user equipment (UE), comprising:

  • entering a sleep mode;

    waking from the sleep mode after a predetermined period of time passes;

    signaling uplink information at the UE, the uplink information providing an uplink timing of the UE;

    determining whether a timing adjustment command has issued, wherein the issuance of the timing adjustment command is based on properties of the UE;

    adjusting the uplink timing at the UE based on the issued timing adjustment command when a timing adjustment command is determined to have issued; and

    reentering the sleep mode without the adjusting when no timing adjustment command is determined to have issued;

    wherein the properties of the UE comprise at least one of a velocity of the UE and a current synchronization timing of the UE.

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