Iub Interface

The protocol architecture for the Iub interface is
shown in Figure 6-21. This is the interface between an RNC and the Node
B that it controls. In the protocol architecture, we again find the transport
network control plane as was seen for the Iu-CS interface. In the control
plane, we find the Node B Application Part (NBAP) as the application protocol.
In the user plane, we find a number of frame protocols related to various
types of transport channels previous described in this chapter.
Basically, a specific framing protocol is applicable to each of the transport
channels. Note that Figure 6-21 indicates the Uplink Shared Channel
(USCH). This is a transport channel defined for TDD-mode only.