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

摘要: A system and method for time division duplex communication over a single frequency band wherein guard overhead is reduced by active adjustment of reverse link transmission timing as function round trip propagation time. frame divided into plurality slots, during each which the base station transmits to user station. Communication initiated transaction. In response general polling message from station, seeking establish short reply message. The calculates distance measuring delay with respect receipt sends command instructing advance or retard its according calculated distance, so minimize times between slots. Thereafter, monitors transmissions periodically commands in like manner. may transmit control preamble at start slot allow perform calculations, and/or power antenna selection. capable independently selecting bands slots link, providing pure Time Division Duplex (TDD) mode, Frequency (FDD mode Hybrid Duplex/Frequency (TDD/FDD) mode.