ITU-T Q.3229 PDF

This Recommendation specifies the protocol for the interface between the transport location management physical entity (TLM-PE) of the network attachment control entity (NACE) and the handover decision and control physical entity (HDC-PE) of the mobility management and control entity (MMCE). M2 interface provides information from the TLM-PE to the HDC-PE to support the security association. This Recommendation supports information flows providing the keying material via the M2 reference point as specified in [ITU-T Y.2018].