The fronthaul interface enables the communication and synchronization of the Baseband Unit (BBU) with the Radio Unit (RU). To date, multiple protocols have been developed and implemented in order to establish the communication over this link, such as Common Public Radio Interface (CPRI), Open Base Station Architecture Initiative (OBSAI), enhanced CPRI (eCPRI), Next Generation Fronthaul Interface (NGFI), and Open Radio Access Network (O-RAN) fronthaul protocol. Many of these have been designed to be open (e.g., CPRI) but became vendor-specific to achieve better performance, optimization, and efficiency.
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