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Timing adjustment control for efficient time division duplex, frequency division duplex or hybrid time division duplex/frequency division duplex communication

  • US 6,094,421 A
  • Filed: 01/21/1997
  • Issued: 07/25/2000
  • Est. Priority Date: 06/05/1995
  • Status: Expired due to Term
First Claim
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1. A base station for time aligning received signals, comprising:

  • a receiver for receiving signals transmitted by a plurality of user stations,a propagation delay calculator coupled to the receiver that determines a propagation delay for each signal received by the receiver,a timing adjustment command unit coupled to the propagation delay calculator, the timing adjustment command unit responsive to the propagation delay and outputting a timing adjustment command directing a one user station of a plurality of user stations in communication with the base station to advance or retard a time for transmitting, andadjustable means to select a first frequency band and a first time slot for a forward link and a second frequency band and a second time slot for a reverse link such that a pure TDD mode, a pure FDD mode or a hybrid TDD/FDD mode is selected, said first frequency band may be the same as said second frequency band, and said first time slot may be the same as said second time slot.

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