Self-optimizing adaptive transmission mode selection for LTE-WLAN aggregation

As licensed spectrum is scarce and users have ever increasing throughput and data volume requirements, mobile network operators (MNOs) are looking for innovative ways for using the unlicensed spectrum. One such solution is LTE-WLAN aggregation (LWA) where a LTE radio bearer can be served by making use of both LTE and WLAN resources in a flexible manner. This paper proposes a self-optimizing algorithm that tunes the aggregation mode and controls how data is split between LTE and WLAN. Results show that the proposed algorithm is able to derive the optimal control parameter settings per cell under different load conditions. As a result, improved average and 5th percentile UE throughput values are observed along with a more even throughput distribution among LWA and non-LWA users. The performance of individual cells in the scenario is also leveled out thanks to the SON algorithm.