A survey of telecommunication network virtualization projects

In recent years, information technology triumphs virtualization concept - an approach that allows flexible management of computing equipment, turning physical servers and data storage systems in universal and efficiently use computing resource. Today the development of telecommunication networks is goes in a similar scenario towards Future Networks. Network devices (switches, routers, base stations, and others.) and their communication environment viewed as a pool of physical resources of a certain capacity. The main resource of telecommunication network is its bandwidth, therefore, the implementation of the required network applications and services provided by the redistribution of the necessary bandwidth over the existing physical network infrastructure. In practice, the paradigm of network virtualization is implement in the form of technologies such as Software Defined Network, Network Functions Virtualization and Overlay Networks. Network virtualization is an innovation that will allow realizing the true diversity of applications and services that are difficult or impossible provide within the existing of the next generation networks. The article provides an overview of the foreign network virtualization projects, followed by a discussion of the major problems in this area.