name: REAR
full_form: Remote UE access via relay UE
context: UE communication via UE-to-Network relay. The REAR key will be used for deriving the ProSe key KNR_ProSe. Input to the Key Derivation Function for deriving the REAR key is as follows: REAR Key = KDF (Latest KAUSF, SUPI of the Remote UE, Relay UE ID bound to SUPI of relay/TempID of relay, other possible parameters) The generated key is 256 bits long out of which, the 128 bits MSB of the key is the REAR Key and the other 128 bits is the REAR Key ID. The purpose of the REAR Key ID is to identify the REAR key. Note 1: The input parameters to derive the keys are not addressed in the present document. Step 6-9: AUSF sends the generated REAR key and Relay UE ID/TempID of Relay which is bound to UE-to-Network relays SUPI in the key response message to the Remote AMF. The remote AMF includes the REAR key in the security context of the remote UE. Step 10: Remote UE discovers the relay UE using any of Model A or Model B methods. The discovery message needs to include the relay UE ID provided by
description: Remote UE access via relay UE (REAR) is a technology that enables user equipment (UE) communication via UE-to-Network relay, allowing for secure key derivation and exchange between the remote UE and the relay UE.
explanation: The context describes REAR as a solution for UE communication via UE-to-Network relay, involving key derivation and exchange. This indicates that REAR is a technology used in telecommunications to facilitate secure communication between UEs.
section_title: 6.1.2	Solution details
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biotag_Description: B-Technology,I-Technology,I-Technology,I-Technology,I-Technology,I-Technology,O,O,O,O,O,O,O,O,O,O,O,B-Interface,O,O,O,O,O,O,O,O,O,O,O,B-Device,O,O,O,O