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The millimeter wave spectra at 71-76GHz (70GHz) and 81-86GHz (80GHz) have thepotential to endow fifth-generation new radio (5G-NR) with mobile connectivityat gigabit rates. However, a pressing issue is the presence of incumbentsystems in these bands, which are primarily point-to-point fixed stations(FSs). In this paper, we first identify the key properties of incumbents byparsing databases of existing stations in major cities to devise severalmodeling guidelines and characterize their deployment geometry and antennaspecifications. Second, we develop a detailed uplink interference framework tocompute the aggregate interference from outdoor 5G-NR users into FSs. We thenpresent several case studies in dense populated areas, using actual incumbentdatabases and building layouts. Our simulation results demonstrate promising 5Gcoexistence at 70GHz and 80GHz as the majority of FSs experience interferencewell below the noise floor thanks to the propagation losses in these bands andthe deployment geometry of the incumbent and 5G systems. For the few FSs thatmay incur higher interference, we propose several passive interferencemitigation techniques such as angular-based exclusion zones and spatial powercontrol. Simulation results show that the techniques can effectively protectFSs, without tangible degradation of the 5G coverage.

Uplink Interference Mitigation Techniques for Coexistence of 5G mmWave Users with Incumbents at 70 and 80 GHz