name: CU
full_form: Central Unit
context: evolved. Trust within the network is considered as decreasing the further one moves from the core. This has impact on decisions taken in 5G security design, thus we present the trust model in this section. The trust model in the UE is reasonably simple: there are two trust domains, the tamper proof UICC on which the Universal Subscriber Identity Module (USIM) resides as trust anchor and the Mobile Equipment (ME). The ME and the USIM together form the UE. The network side trust model for roaming and non-roaming cases are shown in the two following figures respectively, which shows the trust in multiple layers, like in an onion. The Radio Access Network (RAN) is separated into distributed units (DU, or gNB-DU) and central units (CU, or gNB-CU) - DU and CU together form the gNB, as seen above. The DU does not have any access to customer communications as it may be deployed in unsupervised sites. The CU and Non-3GPP Inter Working Function (N3IWF - not shown in the figures), which
description: The Central Unit (CU) is a component of the Radio Access Network (RAN) in the 5G system. It handles customer communications and works with the Distributed Unit (DU) to form the gNB. The CU is considered a trusted entity within the network.
explanation: The CU is classified as a Network Function because it performs specific tasks within the RAN, such as managing customer connections and collaborating with other network elements (the DU) to provide service.
section_title: 5.6.3	Security aspects of the 5G System - Phase 1
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