Sidelink Beam Feedback Mechanism for Millimeter-Wave Propagation Loss

The patent reuses existing sidelink channels (PSCCH, PSSCH, PSFCH) and information structures (SCI, MAC CE) for beam feedback purposes, making these existing components serve dual functions: their original purposes plus beam feedback transmission. This avoids designing dedicated beam feedback channels and structures, thereby improving productivity without significantly increasing device complexity.

The patent implements a beam feedback mechanism where the receiving end measures reference signals, determines beam quality metrics (such as RSRP), and feeds back beam indication information to the transmitting end. This feedback enables the transmitting end to adjust its beamforming parameters to compensate for millimeter wave propagation losses, thereby maintaining high data transmission speed while mitigating the adverse effects of high propagation loss.

The patent enables the receiving end to autonomously measure reference signals, evaluate beam quality, and generate beam feedback information without continuous network control. The transmitting end then uses this feedback to self-adjust its beamforming parameters. This self-service approach improves signal transmission reliability through adaptive beamforming while reducing the need for complex network-controlled beam management.