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RNSAP (Radio Network Subsystem Application Part) is a 3GPP signalling protocol responsible for communications between RNCs Radio Network Controllers. It is carried on the lur interface and provides functionality needed for soft handovers and SRNS (Serving Radio Network Subsystem) relocation (handoff between RNCs).It provide handover through signal check of SRNC(Serving RNC) and DRNC(drift RNC).
SRNC | DRNC | IUR | RNSAP | RNSAP | | |
Converge protol | Converge protol
| | | AAL 5 | AAL5 ATM | ATM
Physical links------→→→ Physical links
It is defined by the 3GPP specification TS 25.423
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