25 series - Iub interface protocol stack
The Iub interface connects an RNC to a Node B.
Like the other UTRAN interfaces, its protocol stack is divided into two layers. All the UMTS-related issues are in the radio network layer, while the transport network layer contains standard technology used for the underlying transport. The stack is also divided into three planes. The user plane handles data streams that eventually reach the UE, the control plane handles Iub signalling messages and the transport network control plane manages the underlying transport.
So there are two important protocols here: the NBAP defines the signalling messages exchanged over the Iub interface and the frame protocols define the data streams.
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