Patent ID: 7764658
Filing Date: 2010-07-27
Classification: H04L,H04W

Abstract:
1. An orthogonal-frequency-division multiple-access (OFDMA) cellular communication method, comprising: identifying a distressed terminal of a plurality of terminals in a cellular network, wherein the distressed terminal is identified as receiving downlink transmission signals having an signal to interference and noise ratio (SINR) less than a threshold; coordinating downlink transmission to the distressed terminal, comprising designating a time-frequency slot for assisting the identified distressed terminal, comprising selecting pseudo-random bit sequences (PRBS), and aligning the PRBS of the multiple sectors and multiple cells, wherein the aligning comprises assigning a time-frequency slot for the identified distressed terminal; steering a plurality of beams toward the distressed terminal, wherein steering comprises beamforming using multiple antennas from across at least one of one or more sectors and one or more cells, and coordinating the beams to the distressed terminal; using one sector in the transmission zone to augment transmission in another sector in the transmission zone; steering a beam toward a distressed terminal in a serving sector; steering a beam away from a distressed terminal in an interfering sector; and using simultaneous orthogonal beams to reduce interference between the distressed terminal in the serving sector and the distressed terminal in the interfering sector.