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Sub-Terahertz frequencies (frequencies above 100 GHz) have the potential tosatisfy the unprecedented demand on data rate on the order of hundreds of Gbpsfor sixth-generation (6G) wireless communications and beyond. Accurate beamtracking and rapid beam selection are increasingly important since antennaarrays with more elements generate narrower beams to compensate for additionalpath loss within the first meter of propagation distance at sub-THzfrequencies. Realistic channel models for above 100 GHz are needed, and shouldinclude spatial consistency to model the spatial and temporal channel evolutionalong the user trajectory. This paper introduces recent outdoor urban microcell(UMi) propagation measurements at 142 GHz along a 39 m $\times$ 12 mrectangular route (102 m long), where each consecutive and adjacent receiverlocation is 3 m apart from each other. The measured power delay profiles andangular power spectrum at each receiver location are used to study spatialautocorrelation properties of various channel parameters such as shadow fading,delay spread, and angular spread along the track. Compared to the correlationdistances reported in the 3GPP TR 38.901 for frequencies below 100 GHz, themeasured correlation distance of shadow fading at 142 GHz (3.8 m) is muchshorter than the 10-13 m as specified in 3GPP; the measured correlationdistances of delay spread and angular spread at 142 GHz (both 12 m) arecomparable to the 7-10 m as specified in 3GPP. This result may guide thedevelopment of a statistical spatially consistent channel model for frequenciesabove 100 GHz in the UMi street canyon environment.

140 GHz Urban Microcell Propagation Measurements for Spatial Consistency Modeling