Timing Accuracy for eCPRI Fronthaul and Open RAN
Open RAN is an eCPRI-based open fronthaul interface between the radio unit (RU) and distributed unit (DU). This white paper discusses timing accuracy for eCPRI fronthaul transport networks.
The eCPRI interface is supported by packet switched fronthaul transport networks. When the fronthaul network is used to synchronize an eCPRI node, it must provide timing at the user network interface according to the relevant 3GPP timing accuracy category. Time error budgets for timing accuracy categories are given by the eCPRI Transport Network Requirements Specification.
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