name: HI
full_form: Handover Interface
context: according to solution 5. In case current USIM versions should not support adding the HI bit, new USIMs providing this support could be issued even while the user was still on a pre-Rel-8 HLR, with the HI bit set to 0. User on upgraded pre-Rel-8 HLR: If the user has an Rel-8 USIM the HI bit may now be set to 1. If it is set to 1 an ME attached to E-UTRAN enforces cryptographic separation of E-UTRAN authentication vectors, i.e. it does not accept authentication vectors with the separation bit in the AMF set to 0. The network entities now behave from a security point of view according to the current TS 33.abc. To set the HI bit on the USIM, it would be advantageous to be able to add / toggle the HI bit on already deployed USIMs using Over-The-Air (OTA) protocols. However, this approach has the limitation that some already deployed USIMs may not have the correct permissions to allow the flag to be provisioned using OTA techniques. Also some operators may not have an OTA server. If the
description: The Handover Interface (HI) is a communication pathway between network functions that enables the transfer of authentication vectors and enforces cryptographic separation in E-UTRAN networks.
explanation: The HI is classified as an Interface because it acts as a channel for communication between different network components, facilitating the exchange of essential data like authentication vectors and ensuring secure communication through cryptographic measures.
section_title: 8.9.2.6	Solution 6: Gradual upgrade of HLR using indicator on Rel-8 USIM
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