The activities proposed in the project seek to solve two open topics in the case of 5G and 6G networks considering different types of architectures and scenarios: fronthaul networks with massive MIMO and synchronization. In the first topic, algorithms and estimation techniques are researched for the massive MIMO fronthaul scenario, where the use of transport networks without support for the IEEE 1588 protocol is assumed. Another topic of interest is in the cell-free context, where the impact of synchronization failures on network performance is studied.