Modelling the power cost and trade-off of live migration the virtual machines in cloud-radio access networks

In this paper, a live migration of the virtual machines (VMs) power consumption (PC) model is introduced in the virtualised cloud radio access networks (C-RANs). The model proposed an easy and parameterised model to evaluate the power cost of migrating the VMs from one server to another. This work is different than other research works found in the literature. It is not based on software, utilisation ratio or heuristics. Rather, it is based on converting and generalising the concepts of live migration process and experimental results from other works, which are based on the aforementioned tools. The proposed model converts the power cost of live migration from a function of utilisation ratio to a function of server PC. This means it supports researchers to dispense the expensive physical servers. The resulting model is simple, on the fly, and accurate PC evaluation. Furthermore, the latency cost of live migration process is modelled, included the down time, which the VM takes to be completely transferred to the target server. Alongside, the link distance/delay cost between the migration servers is discussed.