The ability to assign functions that comprise the BBU processing in centralized softwarised Radio Access Networks into different servers the, have been proven to be beneficial, in terms of energy efficiency. This paper proposes a heuristic suitable for BBU functions allocation and evaluates the impact of dynamic resource management in these environments facilitated through Virtual Machine (VM) live migration. The benefits associated with VM migration are quantified through a series of experiments. Our results show notable improvement in terms of resource and energy efficiency.