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Fronthaul Design In Cloud Radio Access Networks: A Survey

8.  Conclusion

Even though C-RAN architecture was proposed a few years ago, the fronthaul limitation acting as a hurdle for the practical deployment. Many solutions like change in C-RAN architecture, fronthaul compression, edge caching, etc., are proposed to alleviate the burden on the fronthaul link, but they aid up to only some extent. The change in C-RAN architecture brings a limitation on the densification of network to achieve high network capacity and introduces complexity at the RRH, which nullifies the purpose of the introduction of Fully centralized C-RAN. Various fronthaul compression techniques that were also studied not supporting the 5G data rate requirements. Network-information theoretic compression techniques are performing better as compared to point-to-point compression techniques based on quantization. Hence, there is a need for the design of more robust network-information theoretic compression techniques to make C-RAN a feasible network architecture.

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