下一代移动前传白皮书

面向5G的移动前传接口标准（ECPRI），基于功能划分 The centralized baseband unit (BBU) deployment advocated by C-RAN offers significant advantages, including network deployment acceleration, reduced operating and investment costs, effective support for cooperative technologies, carrier aggregation and other key LTE-A technologies, as well as improved network performance[1]. However, fronthaul transmission constitutes a major challenge to C-RAN deployment. Taking LTE as an example, CPRI interfaces have high bandwidth and low latency requirements; although using active or passive WDM technology can effectively resolve the fronthaul problem and save fiber, it also introduces additional transmission equipment, resulting in rising costs. Therefore, if a more flexible, low-bandwidth fronthaul network can be designed, it would further resolve C-RAN networking transmission problems. In addition, the need for protection resulting from C-RAN centralization also necessitates flexible routing between BBU pools and RRUs. In short, traditional CPRIs will struggle to support the future networking demands of centralized C-RAN deployment.