Editing My 3GPP 38.300 Notes (section)

== 4.4 Radio Protocol Architecture ==

=== 4.4.1 User Plane (UP) ===
The figure below shows the protocol stack for the user plane, where SDAP, PDCP, RLC and MAC sublayers (terminated in gNB on the network side) perform the functions listed in clause 6.

[[File:Protocol stack Radio UP.png|center|Protocol stack Radio UP]]

=== 4.4.2 Control Plane (CP) ===

The figure below shows the protocol stack for the control plane, where:

* PDCP, RLC and MAC sublayers (terminated in gNB on the network side) perform the functions listed in clause 6;
* RRC (terminated in gNB on the network side) performs the functions listed in clause 7;
* <span style="color:red">NAS control protocol</span> (terminated in AMF on the network side) performs the functions listed in TS 23.501, for instance: authentication, mobility management, security control…

[[File:Protocol stack Radio CP.png|center|Protocol stack Radio CP]]