Sustainable NFV Networks for Beyond 5G
The next technology after 5G, i.e., Beyond 5G, has been expected to realize sustainable networks for creating new values in our society by adding new functionalities (i.e., ultra-low power consumption, ultra-security and reliability, autonomy, and scalability) to the 5G features (i.e., high speed and high capacity, low latency, and multiple simultaneous connections). Network functions virtualization (NFV) plays a key role to realize Beyond 5G. NFV is a new paradigm to achieve flexible and agile network services by decoupling network functions from proprietary hardware and running them on generic hardware as virtual network functions (VNFs). One of the challenging issues of NFV networking is optimal resource allocation where physical resources (e.g., physical servers and links) are appropriately allocated to a logical network (i.e., slice) or logical path (i.e., service path) according to users’ demand. In addition, adaptability to spatio-temporal changes of users’ demand and resiliency against failures of equipment/software are also important issues. In this research, we tackle these issues by combining mathematical methods (i.e., mathematical optimization and graph neural networks) and practical technologies (e.g., cloud-native network function (CNF)).