name: VLR
full_form: Visitor Location Register
context: functionality to influence assignment, storage and disclosure of those IDs. Motivating Statement 6: High data redundancy Many of the end user data, which are necessary for call setup, can be found duplicated in the involved network elements. Using the network scenario in figure 4.1.4 and 3GGP's [5] as a reference, the following use case shows the existing data redundancy concerning the HLR, VLR and SGSN. Use Case 6: End user data common to HLR and VLR (SGSN) The VLR and SGSN store only a subset of the subscriber data available in the HLR. Updating of subscriber information shall be done in a way to make available and to keep consistency of data shared between the HLR and the VLR, and between the HLR and the SGSN as appropriate. Two different cases for the updating of subscriber data can be identified: framed operation: during location update or restoration a complete set of the shared subscriber data needs to be inserted in the VLR or the SGSN; stand-alone operation: whenever
description: The Visitor Location Register (VLR) is a network function responsible for storing and managing subscriber data, specifically for users currently located within its serving area. It plays a crucial role in call setup and location updates, interacting with other network elements like the Home Location Register (HLR) and Serving GPRS Support Node (SGSN).
explanation: The VLR is classified as a Network Function based on its responsibility for managing subscriber data and facilitating communication between different network elements.
section_title: 4.1Motivation - Use Cases
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