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A system for efficient time division duplex communication between a base station and a plurality of user stations over multiple frequency bands whereby guard time overhead is reduced through use of an interleaved frame structure and active adjustment of reverse link transmission timing as a function

A system for efficient time division duplex communication between a base station and a plurality of user stations over multiple frequency bands whereby guard time overhead is reduced through use of an interleaved frame structure and active adjustment of reverse link transmission timing as a function of round trip propagation time. A time frame is divided into a plurality of time slots. A user station transmits a preamble over a user frequency band. The base station receives the preamble and transmits, in a given time slot, a forward link message over a base frequency band to a user station. The user station responds with a reverse link message over the user frequency band in a subsequent time slot. While the base station is transmitting to a first user station over the base frequency band, it receives messages from another user station over the user frequency band, using the time slot differential between forward and reverse link messages for round trip propagation. The base station may, based on a measured propagation delay, command the user station to adjust its reverse link transmission timing so as to allow for reduced guard times. The base station may also instruct the user station to adjust its power, or may perform antenna selection in a multi-antenna system, in response to receiving the preamble from the first user station. Base and user time slots may be offset to increase the amount of available propagation delay time for round trip messaging, and avoid simultaneous transmission and reception by a user station.

대표청구항 ▼

A method of duplex communication, comprising the steps of transmitting, over a first frequency band of a plurality of frequency bands, a control pulse preamble from a user station to a base station, receiving, during a first preamble interval, said control pulse preamble at said base station, transm

A method of duplex communication, comprising the steps of transmitting, over a first frequency band of a plurality of frequency bands, a control pulse preamble from a user station to a base station, receiving, during a first preamble interval, said control pulse preamble at said base station, transmitting, over a second frequency band of said plurality of frequency bands and during a base message interval following said first preamble interval, a base-to-user message from said base station to said user station, receiving said base-to-user message at said user station, transmitting, over said first frequency band, a user-to-base message from said user station to said base station, and receiving, during a user message interval following said base message interval, said user-to-base message at said base station.