Paradoxically, with an ever-increasing traffic demand, today transport-network operators
experience a progressive erosion of their margins. The alarms of change are set, and …

Network Function Virtualization (NFV) is a promising technique to greatly improve the
effectiveness and flexibility of network services through a process named Service Function …

NFV is promising to lower the network operator's capital expenditure and operational
expenditure by replacing proprietary hardware-based network equipment with software …

An important challenge in network virtualization is the process of assigning physical
resources to virtual network requests, where virtual node resources represent the demands …

Efficiently mapping multiple virtual infrastructures (VIs) onto the same physical substrate with
survivability is one of the fundamental challenges related to network virtualization in …

Network Function Virtualization (NFV) allows multiple Virtual Networks (VNs) to share the
underlying physical infrastructure via VN mapping, thus improving the utilization of physical …

Based on the virtualization technique in optical networks, virtual transport network services
(VTNS) has been introduced as a new kind of service in transport networks. With VTNS …

In this paper, we study the problem of survivable impairment-constrained virtual optical
network mapping in flexible-grid optical networks (SIC-VONM). The objective is to minimize …

We propose a cognitive algorithm based on Fuzzy C-Means (FCM) technique for the
learning and decision-making functionalities of software-defined optical networks (SDONs) …

The elastic optical networks can elastically allocate spectrum tailored for various bandwidth
requirements. In addition, different virtual optical networks (VONs) formed by different …