NBAP

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Signalling protocol responsible for the control of the Node-B by the RNC is called NBAP (Node-B Application Part). Sometimes 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 separate cells or sectors of the Node-B. NBAP is carried over Iub.

[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).

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