Don't understand the query fully its one of the function of RRC. List includes following functionality.
Broadcast of System Information related to the non-access stratum (NAS);
Broadcast of System Information related to the access stratum (AS);
Paging;
Establishment, maintenance and release of an RRC connection between the UE and E-UTRAN
Security functions including key management;
Establishment, configuration, maintenance and release of point to point Radio Bearers;
Mobility functions
QoS management functions;
UE measurement reporting and control of the reporting;
NAS direct message transfer to/from NAS from/to UE.
Your question looks to be why RRC has NAS information if not done by RRC then some other layer will do it. I hope I understood your question if not please comment.
