Dynamic Spectrum Sharing (DSS) enables mobile operators to dynamically share spectrum across different technologies, including the Citizen’s Broadband Radio Service band. It’s an important function that can enable the faster introduction of new 5G services. Nokia says DSS can also be used across all Radio Access Types to manage the transition period around the uptake of new services as well as the decline of a legacy technology.
Nokia supports different methodologies for dynamic sharing between 2G, 3G and 4G. DSS between 4G and 5G will become an important technology with the introduction of 5G to the Frequency Division Duplex (FDD) bands, according to the company in a blog post. The first 5G FDD network was launched in the U.S in December 2019 and is powered by Nokia. 5G FDD devices supporting DSS will become available during 2020. Nokia will introduce DSS as a software upgrade in line with commercial 5G FDD mass market device availability this year.
The practical benefits of using DSS varies between operators due to their differing radio spectrum assets and their strategies for 5G services. For example, used in conjunction with higher frequency bands (3.5 GHz), 5G FDD with DSS can boost the end user experience with an additional low-band carrier. Similarly, outside of the 3.5 GHz band, DSS provides a flexible way to extend 5G services using an operator’s legacy frequency bands.
Nokia’s DSS solution is designed to maintain legacy key performance indicators and considerably adds capacity compared to legacy technology alone. The company projects DSS will generate real performance gains with 5G standalone networks which are expected from 2021 to deliver latency benefits in dense urban environments.