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Providing timing reference for femto cell in wireless communication networks

  • US 8,274,947 B1
  • Filed: 10/06/2008
  • Issued: 09/25/2012
  • Est. Priority Date: 10/05/2007
  • Status: Active Grant
First Claim
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1. A method for providing a timing reference to a femto base station (Femto BS) in wireless communications in a Code Division Multiple Access (CDMA) network, comprising:

  • operating a CDMA Mobile Station (MS) receiver in the Femto BS to provide receiving functions in the Femto BS;

    using the CDMA MS receiver to search and acquire CDMA signals from adjacent cells on at least one CDMA channel in one frequency band;

    selecting a CDMA signal from the adjacent cells with Pilot Pseudorandom Noise (PN) Offset of an earliest timing shift to be a timing reference for the Femto BS;

    operating the Femto BS to monitor the CDMA signals from adjacent cells in the CDMA network to update the timing reference;

    supporting a handoff between cells in the CDMA network and the Femto BS using a virtual Femto BS at a position different from an actual location of the Femto BS by a distance equal to a transmission delay from base station of the cell having the earliest timing shift; and

    using the Femto BS to provide timing reference relay so that the Femto BS and one or more other femto base stations form a timing reference network that is synchronized to a single timing source.

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