5.2 Security protection of test control messages
36.5093GPPEvolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Packet Core (EPC)Release 17Special conformance testing functions for User Equipment (UE)TS
The test control messages, i.e. ACTIVATE TEST MODE, DEACTIVATE TEST MODE, CLOSE UE TEST LOOP, and OPEN UE TEST LOOP, are integrity protected and ciphered according to TS 24.301 clause 4.4.