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Uplink synchronization method and apparatus

  • US 9,107,160 B2
  • Filed: 10/24/2011
  • Issued: 08/11/2015
  • Est. Priority Date: 04/24/2009
  • Status: Active Grant
First Claim
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1. An uplink synchronization method comprising:

  • obtaining a first timing advance of a first carrier according to a random access channel (RACH) or a reference symbol (RS) in the first carrier;

    obtaining a second timing advance of a second carrier according to the first timing advance wherein an initial RACH access process does not need to be performed at the second carrier;

    sending data in the second carrier at an uplink sending time corresponding to the second timing advance;

    wherein the second timing advance of the second carrier is equal to the first timing advance of the first carrier;

    orwherein the second timing advance of the second carrier is a sum of the first timing advance of the first carrier and the difference between downlink delays of the first and second carriers.

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