Simplifying Spectrum Migration from 5G to 6G

As the research and development of 6G networks progress, it is crucial to address the challenges related to spectrum scarcity. While new spectrum bands may be allocated for 6G, the existing frequency ranges utilized by 5G remain important for 6G coverage and capacity. To ensure a seamless transition between 5G and 6G without compromising network performance, Nokia recommends Multi-RAT Spectrum Sharing (MRSS) and 6G Carrier Aggregation (CA) as preferred solutions. 

This white paper offers an overview of the technical merits and deployment aspects associated with MRSS. It draws valuable insights from the migration experience from 4G to 5G with DSS, highlighting the improved coexistence capabilities of 5G’s New Radio (NR) standard with future
generations. The paper explores various physical layer facets, including waveforms and numerology, energy efficiency aspects, as well as strategies to minimize signalling overhead. Practical deployment considerations such as frequency bands and network architecture are also discussed.