2.2.1.
Logical elements of EPS
2.2.1.1
User Equipment
User Equipment (UE) is the device that a consumer uses for communication. The pur-
pose of communication could be voice oriented or data oriented. The device could be a
handheld device or a wireless data card or a modem. Each user is provided with Univer-
sal Subscriber Identity Module (USIM). USIM identifies the UE from other UEs and
holds the authentication and security keys related operations. Apart from holding these
functionalities, UE also forms an important element for mobility management in EPS as
it holds key role to operate radio functionalities of EPS.
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