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Downlink network synchronization mechanism for femtocell in cellular OFDM systems

  • US 8,989,085 B2
  • Filed: 10/30/2009
  • Issued: 03/24/2015
  • Est. Priority Date: 10/31/2008
  • Status: Active Grant
First Claim
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1. A method for downlink transmission synchronization in a cellular orthogonal frequency division multiplexing (OFDM) system, the method comprising:

  • (a) scanning and receiving a plurality of reference signals transmitted from a plurality of neighboring macro base stations by a femto base station;

    (b) determining a desired reference signal by selecting from the received plurality of reference signals during a predefined observation window, wherein the observation window length is smaller than half of a frame length but substantially larger than propagation delay among the plurality of neighboring macro base stations; and

    (c) configuring downlink radio signal transmission of the femto base station based on the desired reference signal such that the femto base station is synchronized with the plurality of neighboring macro base stations.

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