name: EAS
full_form: edge application server
context: Figure 6.2.7.2-1 shows the messages exchanged between the UE, HSE, HSS/EMKS and EAS in order to setup a BEST Session when using EMSDP. In this figure, the EMKS and HSS are collapsed into one. Figure 6.2.7.2-1: BEST Session Setup Procedure for BEST Key Agreement Only Service using EMSDP The above figure depicts BEST Session setup procedure for Key Agreement Only service. The EAS PSK is provided by the HSE to the EAS in step 5. The UE derives all the required keys in Step 9. The EAS shall also be able to obtain the EAS PSK anytime after the BEST Session is setup by the UE. The EAS initiates a EAS Session Request message with the required Key Id (specific to the UE). The HSE derives EAS PSK and provides it in the EAS Session Start message. NOTE1: The Key Id refers to the Intermediate Key Identifer that uniquely identifies the UE-specific Intermediate key. The mechanism by which UE provides Key Id to the EAS is out of scope of this specification. NOTE 2: The EAS application layer key
description: The Edge Application Server (EAS) is a network function that plays a crucial role in setting up BEST Sessions and managing keys for edge applications. It interacts with the UE, HSE, and HSS/EMKS to facilitate secure communication and key exchange.
explanation: Based on the context provided from 3GPP TS 33.163, section 6.2.7.2, EAS is classified as a Network Function due to its involvement in BEST Session setup procedures, key agreement, and interaction with other network entities like UE, HSE, and HSS/EMKS.
section_title: 6.2.7.2	Procedures for BEST Key Agreement Only Service using EMSDP
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