A Link Quality Estimation-based Beamforming Training Protocol for IEEE 802.11ay MU-MIMO Communications

Abstract

The enables an and multiple to determine appropriate directional antenna patterns; to this end, the ap transmits multiple action frames to the stas during the mumimo bft. However, if the are determined to transmit the action frames inefficiently, this could lead to unnecessary transmissions, which could increase the bft time. To mitigate the signaling overhead, the schemes used in our previous work employed awvs, which use multiple beams simultaneously to transmit the action frames. Nevertheless, these existing schemes are still adversely affected by redundant transmissions because these schemes overlook the transmit diversity gain obtained from multi-beam concurrent transmission. Therefore, in this study, we propose a novel transmit antenna configuration scheme that mitigates the signaling overhead by considering the transmit diversity of the channel incurred when multiple beams are used simultaneously. Our proposed scheme determines each candidate awv using multiple beams and efficiently identifies the stas within reach of the corresponding multi-beam concurrent transmission. The numerical and simulation results demonstrate that our proposed scheme shortens the bft time in comparison with existing schemes.