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Abstract Under the new paradigm Software Defined Networking (SDN), which involves decoupling control plane from data plane, and allowing control planes to be deployed on external servers, our main goal is to propose an overview of architecture that can effectively solve problems of network QoS caused by this separation. The overall objective is to study and evaluate the use of SDN networks as a cornerstone of a communication system that can effectively support distributed applications whose needs change over time. In this paper, we focus, in particular, on the controller placement problem in SDN, optimizing the latency, resilience, reliability, scalability and other network performance. The technical solutions to these problems will be studied to identify the components of SDN that can be improved. Keywords SDN ⋅ Network slicing ⋅ 5G ⋅ NFV ⋅ Controller placement ⋅ QoS

1 Introduction Recently, the unprecedented growth of cloud services and the explosion of mobile devices and content have a great impact on computer networks. It is also noted that today’s applications have dynamic nature where traffic patterns have changed significantly and they will be continued in the future, especially with the emergence of new usage such as Big data and the Internet of Things. Such changes are among the trends S. Bouzghiba (✉) ⋅ H. Dahmouni INPT, 2, avenue Allal Al Fassi, Madinat Al Irfane, Rabat, Morocco e-mail: [email protected] H. Dahmouni e-mail: [email protected] A. Rachdi QoS Design, 6, avenue Marcel Doret, 31500 Toulouse, France e-mail: [email protected] J.-M. Garcia CNRS, LAAS, 7 avenue du colonel Roche, 31400 Toulouse, France e-mail: [email protected] © Springer Science+Business Media Singapore 2017 R. El-Azouzi et al. (eds.), Advances in Ubiquitous Networking 2, Lecture Notes in Electrical Engineering 397, DOI 10.1007/978-981-10-1627-1_12

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leading network operators review their infrastructures to make them more adaptable. A solution to this is to make current networks more flexible and programmable by adopting the software defined networking concept. Indeed, Software Defined Networks (SDN) are based on a new paradigm, in contrast to traditional networks, which advocates the separation of control plane and data plane within network equipment. Thus, the control functions are centralized in a controller and the remote control of these functions are managed through Application Programming Interfaces (APIs) [1]. The control plane communicates with the forwarding layer to collect the information (via southbound APIs) and maintains the network topology; and it interacts with the applications and business logic (via northbound APIs) to implement various network functions. This allows building flexible networks that can adapt their operation on demand applications. The control plane between service applications and network devices makes for more flexible and agile network service environments. The service providers can easily launch new applications, dynamically obtain network information from the control