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Methods and apparatus for supporting timing and/or frequency corrections in a wireless communications system

  • US 7,991,362 B2
  • Filed: 08/31/2005
  • Issued: 08/02/2011
  • Est. Priority Date: 07/20/2005
  • Status: Active Grant
First Claim
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1. A method of operating a wireless communications terminal to communicate with a moving base station, the method comprising:

  • receiving a signal from a base station indicating a position of the moving base station;

    computing a relative velocity between the moving base station and a wireless terminal based on the position of the moving base station indicated by the received signal;

    determining a Doppler shift correction based on the computed relative velocity between the moving base station and the wireless terminal; and

    generating uplink signals for transmission from the wireless terminal, the uplink signals comprising the Doppler shift correction based on the computed relative velocity between the moving base station and the wireless terminal combined with a baseband signal or a carrier frequency,wherein the signal is received periodically at an interval and a change in the position of the wireless terminal relative to the moving base station is less than or equal to 11 km, based at least in part on the interval and relative velocity.

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