Abstract
This paper attempts a critical analysis of the Controller Placement Problem (CPP) in Software-Defined Networking (SDN) environments, identifies open issues and exploring potential solutions. The strategies to solve the CPP are examined aiming to enhance network performance, scalability, and resilience. SDN is a powerful technology used more and more in different networks. In particular the SDN control is a strong candidate proposed in 5G architectures. This study considers various aspects of CPP, including latency, reliability, and effective load distribution, which are also important in the context of 5G networks. The analysis reviews existing literature, revealing gaps in current strategies, particularly in addressing the dynamic nature of 5G architectures. Special attention is given to the multi-Controller contexts encountered in large networks, where Multi-controller Placement Problem (MCPP) emerges. This overview not only underscores the criticality of CPP in 5G SDN but also outlines some future research directions by our original proposal for a generic architecture for dynamic optimization in CPP.
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