Abstract
Cloud radio access network (C-RAN) is an important architecture for 5G networks. In C-RAN systems, baseband units (BBUs) are centralized in a BBU pool and remote radio heads (RRHs) are connected with the BBU pool through front-haul links. The BBU-RRH peer switching scheme is quite a key point in C-RAN especially for fast switching scenarios. A typical C-RAN system based on software defined radio (SDR) and virtual machine migration is introduced as the system model. Then we analyze the factors, including packet delay, and power consumption, that influence the performance of a C-RAN system. We conclude backlogs, idle computation resources, and switching costs could reflect the system performance adequately. They can evaluate radio resource usage, computation resource usage, and extra computation resource usage, respectively. Based on the evaluation model, the optimization algorithm is studied. In this paper, we propose a method to find the optimized load range for the BBUs. Taking switching quality into consideration, we propose a scheme that can adjust the BBU working load dynamically in an optimized range with less switching cost. The system performance variation under different switching intervals is also investigated. Finally, the effectiveness of the proposed optimization scheme is validated by simulation results.
Published Version
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