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Uplink synchronization maintenance principles in wireless networks

  • US 8,218,526 B2
  • Filed: 04/29/2008
  • Issued: 07/10/2012
  • Est. Priority Date: 04/30/2007
  • Status: Active Grant
First Claim
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1. A method for maintaining synchronization in a cellular network between a plurality of user equipment (UE) in a cell and a base station (eNB) serving the cell, comprising:

  • maintaining synchronization of each UE in the scheduled group with the eNB by sending a timing adjustment (TA) command if needed in response to receiving a scheduled transmission from each respective UE in the scheduled group;

    determining a maximum TA rate expected for the cell; and

    maintaining synchronization of each UE in the unscheduled group with the eNB by allocating a periodic reference signal (sync-RS) to each UE in the unscheduled group and by sending a respective TA command if needed in response to a respective sync-RS received from each UE in the unscheduled group, wherein the sync-RS period is configured by the eNB to be approximately equal to the inverse of the maximum TA rate expected in the cell.

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