The Cloud Computing paradigm has emerged as suitable technical and business solution for enterprises of any size, due to its offering of managed and serviced resources, and a business model based on on-demand, self-service, and pay-by-use approach. In general, the cloud offers better cybersecurity control, compared to individual systems, because of its vast amount of resources (computation, memory, storage and bandwidth), and high level of automation. However, selected cloud services, and individual cloud customers are still vulnerable to attacks, especially to Denial of Service, which could also be performed to trigger economical loss, rather than performance degradations. In this paper, we envision a collaborative approach between the cloud and its access points, such as mobile networks, to effectively detect such attacks, at the edge of the global system. The idea of protecting the system at the edge is demonstrated with two Denial of Service detection controls, lightweight in design, that could be placed at the very edge of a mobile network. The two controls are implemented and evaluated in a simulation environment, in the scope of a mobile network.