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25 series - Iub interface protocol stack

Up to the 25 series 25.427 - UTRAN Iur/Iub interface user plane protocol for DCH data streams 25.435 - UTRAN Iub interface user plane protocols for Common Transport Channel data streams 25.426 - UTRAN Iur and Iub interface data transport & transport signalling for DCH data streams 25.434 - UTRAN Iub interface data transport and transport signalling for Common Transport Channel data streams 25.426 - UTRAN Iur and Iub interface data transport & transport signalling for DCH data streams 25.434 - UTRAN Iub interface data transport and transport signalling for Common Transport Channel data streams 25.430 - UTRAN Iub Interface: general aspects and principles 25.431 - UTRAN Iub interface Layer 1 25.432 - UTRAN Iub interface: signalling transport 25.433 - UTRAN Iub interface Node B Application Part (NBAP) signalling

Description

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.

Abbreviations

NBAPNode B application part
RNCRadio network controller
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