This white paper provide details on the methodology and results from our simulation studies on 5G NR millimeterwave coverage. The results of the simulation studies conducted across ten global cities, show that significant outdoor downlink coverage (up to 81%) is possible when co-siting 5G NR mmWave with existing 4G LTE macro and small cell sites. The positive results show that mobile deployments in urban-areas based on existing LTE cell cities is feasible, especially when considering the tight-interworking of 5G NR with 4G LTE.