Targeted Acknowledgement (HARQ) Feedback for High-Reliability Local Meshes

Unlike broadcast-only DSRC, NR Sidelink supports directed groupcast and unicast sessions with physical-layer HARQ ACK/NACK signaling.

Distance-Based HARQ Feedback

Follower vehicles calculate physical separation; only vehicles within the critical safety envelope transmit negative acknowledgements, preventing radio feedback storms.

Physical-layer HARQ feedback reduces packet loss rates below 0.001%.
Support for distance-based and connection-oriented groupcast modes.
Dynamic modulation coding scheme (MCS) adjustment to RF link quality.
Hardware encryption for peer-to-peer automotive session keys.

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