SoftBank Corp used a type of quantum computing technology to optimise the base station settings of a 5G network using carrier aggregation (CA), resulting in improved spectrum efficiency and network performance.

CA technology enables high-speed, stable communication by simultaneously using multiple frequency bands, requiring predefined associations between base stations. But as the number of base stations rises, determining the optimal CA link configuration becomes exponentially more complex, the operator explained.

In a proof-of-concept trial, SoftBank used an Ising machine design to perform combinatorial optimisation to generate a CA link configuration. This was then used to simulate the CA-capable coverage area.

The simulation confirmed CA could be made available over a broader area than when using conventional configurations.

When the method was applied to 5G base stations operating in a specific area of Tokyo the CA coverage area expanded, with data transmission capacity increasing by up to 50 per cent and the average downlink data speed improving by about 10 per cent compared to conventional settings.

Looking ahead, SoftBank noted it also will consider applying quantum computing technologies for operational enhancements.