of computing resources [@Rost2]. Such distributed nature may prevent the full utilization of computing resources and lead to an energy and cost inefficient networks. Therefore, more advanced implementations should be investigated to permit a dynamic and flexible utilization of computing resources to network infrastructure. Utilizing similar concept as Cloud-RAN, ComaaS emerges as am promising solution to provide immediate and on-demand access to computing resources for the NSPs as well as the end-users with low cost. Through the virtualization of computing resources, ComaaS can also obtain the cost efficiency for the InSPs, by solely utilizing the needed capacity to satisfy NSP or user’s requirement. When computing resources can be viewed as a service, the distributed computing resources, most of which are typically under-utilized, can be exploited as well. The end-users are also able to contribute its computing with proper stimulation.

Meanwhile, ComaaS is also one enabler for private cloud or cloudlet, which offers hosted services to a limited number of end-users. This is due to the fact that the use of private cloud can be boosted by the increasing number of InSPs and NSPs. What’s more, additional private cloud expenses, including virtualization, cloud software and cloud management tools, can also be 