name: IRAT
full_form: Inter-Radio Access Technology
context: This clause provides a system overview and a discussion on requirements and basic ideas for technical solutions on how a key hierarchy can be introduced in UTRAN. The following high level system model is used. Figure 4.1.1 - System Overview. The figure does not show all possible combinations of involved nodes. The lines in Figure 4.1.1-1 show the signalling / interworking cases that need to be handled. Thick solid line: transfer of AVs. Thin solid line: AKA and security mode command signalling. Thick dashed line: context transfer and/or transfer of unused AVs. It should be noted that the present TR assumes transparency with respect to IRAT mobility procedures, i.e. this TR aims to provide a solutions which are fully compatible with already defined IRAT mobility procedures. This does not preclude considering changes to IRAT mobility procedures that are beneficial and cause no issues when inter-working with legacy nodes. The major issue in the design that is foreseen is how to signal
description: Inter-Radio Access Technology (IRAT) refers to the standards governing the interaction between different radio access technologies, such as UTRAN and other systems, ensuring seamless mobility and interworking between them.
explanation: The context describes IRAT as a set of standards defining how different radio access technologies interact, focusing on aspects like mobility and interoperability. This technical focus on facilitating communication between various technologies places IRAT firmly within the Technology category.
section_title: 4.1.1	Architecture
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