name: VCF
full_form: V2X Control Function
context: The V2X control function (VCF) and V-UE could use a share key to do mutual authentication and establish a secure channel based on PSK TLS. The pre-shared key could be derived during the AKA procedure when the V-UE attach to the network through UU interface. The new key hierarchy based on the 3GPP TS 33.401 [13] is presented as follows: Figure 6.8.2.3-1 Key Hierarchy Based on TS 33.401[13] According to the V2X architecture defined in the TS 23.285 there is no communication interface between VCF and MME, but VCF could communicate with HSS through V4 interface, so VCF could acquires key or materials from HSS. The new branch of key derivation is that, the V-UE and HSS derives a root key KV2X respectively for V2X service during AKA procedure, and then V-UE and VCF derive a pre-shared key KPSK from KV2X respectively. The V-UE and VCF could utilize the KPSK and PSK TLS protocol to perform mutual authentication and establish a secure channel on user plane. Note: This solution does not address
description: The V2X Control Function (VCF) manages V2X services such as authentication, key derivation, and secure communication with the User Equipment (UE) and Home Subscriber Server (HSS). It establishes a secure channel between the UE and itself using the PSK TLS protocol.
explanation: The text describes the VCF as performing specific functions related to V2X services and interacting with other network components. This aligns with the definition of a Network Function, which is responsible for controlling and managing network operations.
section_title: 6.8.2.3	Alternative security procedure for data transfer between UE and V2X Control Function
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