Objective 1: Define the main building blocks of the terrestrial segment in the 3D network, identify a set of use cases, system requirements, and key technological enablers. It includes the analysis of several use cases to extract the different 6G requirements in addition to the identification of the key technical enablers to ensure a cost-effective, ubiquitous, reliable, secure, and scalable.

Objective 2: Design of antenna solutions and resource management techniques. It covers the optimization of the transceiver design for ultra-massive multi-antenna deployments and the Extra-Large Antenna Arrays (ELAAs) considering: i) channel state information quality, ii) coexistence of terminals in the far-field and in the near-field and iii) use of AI/ML based on reinforcement learning. Additionally, design choices to enhance positioning solutions, taking special care of 3D network dimension and hybridization with other solutions such as GNSS positioning are considered.

Objective 3: Design advanced solutions for the evolution of current releases of 5G. Propose solutions to address the energy efficiency and analyze their impact at different layers considering the research roadmap defined in 3GPP 5G.

Objective 4: Enhance spectrum efficiency of the communication networks where signal processing techniques are developed to enable the utilization of wide frequency range (sub-6 GHz frequency bands, mmWave and THz bands).

Objective 5: Evaluate and validate the solutions by means of Proof-of-Concepts. AROMA3D-EARTH will perform several experimental validations and demonstrations of selected techniques developed in the project.