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Urban Macro/Microcellular Channel Characterization at 4.85~GHz With Literature-Referenced Upper-FR1-to-FR3 Cross-Band Analysis
[Submitted on 30 Nov 2025 (v1), last revised 13 Jul 2026 (this v · 2025-11-30 · via eess.SP updates on arXiv.org

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Abstract:The transition from 5G to 6G requires frequency-dependent, physically consistent radio channel models across the upper-FR1/FR3 transition region, particularly in the under-explored $4$--$8$~GHz region targeted in the current WRC-$27$ studies, where outdoor urban channel measurements and characterizations remain scarce. This paper presents a $4.85$~GHz measurement-anchored study of urban channels and a literature-referenced cross-band analysis. Double-directional measurements were conducted at $4.85$~GHz in urban macrocell (UMa) and urban microcell (UMi) routes in Yokohama, Japan, from which path loss, delay spread (DS), azimuth spread of arrival/departure (ASA/ASD), $K$-factor, and route-dependent spatial-consistency statistics were extracted. To align these results in a broader cross-band context, the measured $4.85$~GHz large-scale parameter (LSP) means were combined with scenario-matched literature anchors to derive log-log trends for DS, ASA, and ASD over an approximately $4$--$28$~GHz range around the $7.125$~GHz upper-FR1/FR3 cross-band boundary. The resulting trends were compared with 3GPP UMa/UMi reference parameterizations over the same interval, and the sensitivity of the UMi DS fit was examined via leave-one-out analysis. Because the cross-band analysis still relies on a single in-house measurement band alongside heterogeneous anchors from different campaigns, it is presented as measurement-informed and indicative rather than as a definitive multi-band model. The paper therefore contributes both a detailed, parameterized $4.85$~GHz urban measurement reference and a bounded literature-referenced view of channel behavior near the upper-FR1/FR3 transition.

Submission history

From: Minseok Kim [view email]
[v1] Sun, 30 Nov 2025 03:08:22 UTC (27,339 KB)
[v2] Wed, 8 Apr 2026 08:15:12 UTC (25,117 KB)
[v3] Fri, 5 Jun 2026 22:48:56 UTC (25,047 KB)
[v4] Mon, 13 Jul 2026 12:53:45 UTC (25,212 KB)

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