arXiv:2611.06900v1 Announce Type: new Abstract: Existing millimeter-wave (mmWave) communication beam patterns spatially weight human-scattered signals and shape the received-power signatures induced by human motion. We exploit these beam-shaped signatures for device-free walkingpace and walk-direction classification using a wall-reflected 60.8-GHz link with closely spaced phased arrays and fixed communication beamforming vectors. Human movement alters the interference between wall-reflected and scattered signals, producing power oscillations surrounding a central blockage fade. A beam-dependent interference model provides a physical interpretation of these signatures. Using received-power statistics from a continuous-tone experiment, we extract fade duration for walking-pace classification and pre/post-fade asymmetries for walk-direction classification. Measurements comprise 144 crossings from three participants along perpendicular and diagonal trajectories. Under leave-one-participant-out validation, logistic regression achieves 86.1% binary and 79.2% three-class walking pace accuracy, and 77.1% travel-direction accuracy. The results demonstrate mobility sensing using fixed communication beams without channel estimation, Doppler processing, or dedicated radar hardware