name: SGSN
full_form: Serving GPRS Support Node
context: the service. c) In case of an intersystem change to a GSM BSS controlled by a R98- SGSN, the initial SGSN derives the GSM cipher key Kc from the UMTS cipher/integrity keys CK and IK agreed during the latest UMTS AKA procedure and sends the GSM cipher key Kc to the new SGSN. The new SGSN stores the GSM cipher key Kc and applies it. The new SGSN becomes the new anchor point for the service. d) In case of a handover to another Rel-9+ SGSN, the initial SGSN sends the UMTS cipher/integrity keys CK and IK agreed at the latest UMTS AKA procedure to the new SGSN. The new SGSN derives the 64-bit Kc. The new SGSN stores the keys. If the new SGSN selects a GEA ciphering algorithm requiring a 128-bit key, the new SGSN shall compute Kc128 from the CK/IK and shall apply it. If the new SGSN selects a GEA ciphering algorithm requiring a 64-bit key then Kc shall be applied. The new SGSN becomes the new anchor point for the service. At the user side, in all cases, the ME applies the derived 64-bit GSM
description: The Serving GPRS Support Node (SGSN) is a network function that serves as an interface between the radio access network and the core network in a GPRS/UMTS system. It manages packet data sessions, routes packets to and from the mobile device, and performs authentication and billing functions.
explanation: The text describes the SGSN's responsibilities in managing data sessions, routing traffic, and handling authentication within a telecommunications network. These functions are characteristic of a Network Function.
section_title: 6.8.6.1	UMTS security context
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biotag_Description: O,B-Network Function,I-Network Function,I-Network Function,I-Network Function,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O