RCAF – RAN Congestion Awareness Function
The RCAF is a network element which monitors congestion in the E-UTRAN and UTRAN. The RCAF will collect information related to user plane congestion for an eNB or E-UTRAN cell, and will then liaise with the MME (Mobility Management Entity) to determine which users served by the eNB/cell are being affected. In turn, the RCAF can provide this information to the PCRF (Policy and Charging Rules Function), triggering a policy decision to alleviate the congestion.
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