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METHOD FOR MAINTAINING UPLINK TIMING SYNCHRONIZATION IN A MOBILE COMMUNICATION SYSTEM AND USER EQUIPMENT APPARATUS FOR THE SAME

  • US 20080002660A1
  • Filed: 06/21/2007
  • Published: 01/03/2008
  • Est. Priority Date: 06/22/2006
  • Status: Active Grant
First Claim
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1. A method for maintaining uplink timing synchronization (sync) in a mobile communication system, comprising:

  • transmitting to a Node B an uplink sync request message including a preamble code;

    receiving from the Node B an uplink sync response message in response to the request message;

    adjusting uplink timing according to uplink timing adjustment information included in the response message, and storing the adjusted uplink timing as reference uplink timing for uplink signaling or data transmission;

    periodically measuring downlink timing after storing the reference uplink timing, and calculating a difference between the measured downlink timing and previously stored reference downlink timing;

    determining the uplink timing using the calculated difference of the downlink timing and the reference uplink timing;

    receiving a request message for readjustment of the uplink timing from a Node B that has detected a discrepancy of the uplink timing;

    readjusting the uplink timing using uplink timing adjustment information included in the uplink timing readjustment request message, updating the reference uplink timing with the readjusted uplink timing, and storing the updated reference uplink timing; and

    updating a last measured downlink timing as the reference downlink timing when updating the reference uplink timing, and storing the reference downlink timing.

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