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Channel and Spectrum Consumption Models for Urban Outdoor-to-Outdoor 28 GHz Wireless

Next generation wireless and mobile networks will utilize millimeter-wave (mmWave) communication to achieve significantly increased data rates. However, since mmWave radio signals experience high path loss, the operation of mmWave networks will require accurate channel models designed for specific deployment sites. In this paper, we focus on the deployment area of the PAWR COSMOS testbed in New York City and report extensive 28 GHz channel measurements. These include over 46 million power measurements collected from over 3,000 links on 24 sidewalks at 4 different sites and in different settings. Using these measurements, we study the effects of the setup and environments (e.g., transmitter height and seasonal effects). We then discuss the obtained path gain values and their fitted lines, and the resulting effective azimuth beamforming gain. Based on these results, we also study the link SNR values that can be supported on individual sidewalks and the corresponding theoretically achievable data rates. Finally, we develop a process to transform the measurements and generate Spectrum Consumption Models (SCMs) based on the IEEE 1900.5.2 standard. The generated SCMs facilitate the evaluation of spectrum sharing and interference management scenarios since they capture all the directional propagation effects reflected in the measurements and provide a way to easily share the main propagation characterization results derived from the measurements. We believe that the results can inform the COSMOS testbed deployment process and provide a benchmark for other deployment efforts in dense urban areas.

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