Patent ID: 7197022
Filing Date: 2007-03-27
Classification: H04B,H04L,H04W

Abstract:
1. A frequency division duplexing (FDD) wireless communication method for use by a base station, a first terminal, and a second terminal, wherein the base station transmits using a downlink subframe on a first channel and the first and second terminals transmit using an uplink subframe on a second channel, wherein the downlink subframe includes a broadcast preamble, a time division multiplex (TDM) portion, and a Time Division Multiple Access (TDMA) portion, and wherein the TDMA portion includes at least one modulation/forward error correction (PHY) mode with an associated preamble, both of which are intended for the second terminal, the method comprising: transmitting a broadcast preamble from a base station to a first terminal and a second terminal during a downlink subframe on a first channel; synchronizing the first terminal and the second terminal to the base station based on the broadcast preamble; transmitting modulated data from the second terminal to the base station during an uplink subframe on a second channel; transmitting modulated data from the base station to the first terminal during a TDM portion of the downlink subframe on the first channel after the first terminal is synchronized with the base station; transmitting a preamble from the base station during a TDMA portion of the downlink subframe on the first channel, wherein the preamble is transmitted after the second terminal has transmitted its modulated data to the base station; re-synchronizing the second terminal with the base station based on the preamble transmitted by the base station on the first channel; transmitting modulated data from the base station to the second terminal during the TDMA portion of the downlink subframe on the first channel after the second terminal is re-synchronized with the base station, and transmitting a broadcast downlink map during the downlink subframe from the base station which indicates when the TDM portion of the downlink subframe transitions to the TDMA portion of the downlink subframe.