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Despite the fifth-generation (5G) of mobile communication systems being at its initial stage, the research community has started to focus on its successor. The sixth-generation (6G) is expected to provide massive scale communication and always-on intelligent connectivity, enabling several emerging applications with stricter quality of service (QoS) requirements. Softwarization technologies, network slicing paradigm, and artificial intelligence (AI) will be critical pieces of 6G to manage ultra-dense heterogeneous environments composed of terrestrial and non-terrestrial networks. This work aims to find the most efficient combination of access network and network slices (NSs) in 6G heterogeneous scenarios to satisfy the user petition and maximize the QoS. We propose a Dynamic Radio Access Network Selection (DRANS) algorithm based on Deep-Reinforcement Learning (DRL) as a suitable method to handle the …