NBAP
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In the 3GPP UTRAN architecture, NBAP (Node B Application Part) is the signalling protocol responsible for the control of the Node B by the RNC. NBAP is subdivided into Common and Dedicated NBAP (C-NBAP and D-NBAP), where Common NBAP controls overall Node B functionality, and Dedicated NBAP controls radio links to specific user equipment. NBAP forms part of the Iub interface.
[edit] Protocol stack
+----------------+ | NBAP | +----------------+ | SAAL | +----------------+ | AAL5 | +----------------+ | ATM | +----------------+ | Physical layer | +----------------+
The NBAP protocol is described in the ETSI Technical specification #125 433 (or 3GPP TS 25.433).
