6G Channel Measurement in Urban, Dense Urban Scenario and Massive Ray-Tracing-Based Coverage Analysis at 7.5 GHz

As demands for 6G communication continue to grow beyond 5G-Advanced and 5G capabilities, interest in the upper midband is increasing. However, channel model measurement studies at the upper midband are still limited, and measurement-based channel modeling across diverse propagation scenarios is essential for extending to 6G. Therefore, in this paper, the authors perform a measurement-based close-in path loss (PL) model fitting for Line of Sight (LOS) and Non-Line of Sight (NLOS) in urban and dense urban scenarios, presenting the PL exponent and shadow fading parameters. Measurements were conducted with a channel sounder at 7.5 GHz with 200 MHz bandwidth, achieving maximum T-R separation distances of 306 and 288 meters in Urban Macrocell (UMa) and Urban Microcell (UMi), respectively. Furthermore, a state-of-the-art (SOTA) 6G ray-tracing engine was used to perform simulations in a massive UMi scenario, ensuring the reliability of the measurement results. Finally, in response to the need to maintain 7.5 GHz coverage similar to that at 3.5 GHz, we propose the required gain for similar coverage in dense urban environments.