name: SGSN
full_form: Serving GPRS Support Node
context: UE has CS call in UMTS. When a single standby UE gets the request to set up a PS service, the legacy procedure is to setup PS in UMTS. But the PS service experience in UMTS is not as competitive as LTE and the PS service is wished be set up in LTE for better experience of subscribers in higher data rate. It is beneficial to study on this use case and discuss on some possible solutions to improve userâs experience. As the Dual Standby UE has camped in LTE, even UE is connected in UMTS, UE is assumed to behave as EPS-only in LTE. UE can initiate PS connection in LTE during the CS transmission via UMTS network. This use case includes the following sub-usecases: 3a. Data transmission and reception and connected mode operation in UTRAN. 3b. Maintenance of capability to receive PS service from LTE. 3c. Addition of PS service and transition to use case 4: Initiation of PS service in LTE or reception of paging for PS service from LTE and the signaling procedure for transition to Use case 4.
description: The Serving GPRS Support Node (SGSN) manages and controls data flow between the radio access network and the core network in a GPRS system. It handles relocation preparation, resource allocation, and abnormal conditions during relocations.
explanation: The SGSN is classified as a Network Function because it performs essential tasks like managing data traffic, preparing for user mobility (relocation), and allocating resources within the GPRS network.
section_title: 6.2.3.1	Preparation
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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,B-Technology,O,O,O,O,O,O,O,O,O,O,O,O