name: SGSN
full_form: Serving GPRS Support Node
context: be the payload of the GTP-U protocol at the Gn interface. Therefore the data counted already includes the IP PDP bearer protocols i.e. IP or PPP. The data volume counted in the SGSN is dependent on the system. For GSM SGSN the data volume is the payload of the SNDCP PDUs at the Gb interface. For UMTS-SGSN it is the GTP-U PDUs at the Iu-PS interface. Therefore, in both systems, the data counted already includes the overheads of any PDP bearer protocols. In GSM, in order to avoid that downstream packets transmitted from the old SGSN to the new SGSN at inter SGSN RA update induce the increase of the PDP CDR downstream volume counters in both SGSN the following rules must be followed: - For PDP contexts using LLC in unacknowledged mode: an SGSN shall update the PDP CDR when the packet has been sent by the SGSN towards the MS; - For PDP contexts using LLC in acknowledged mode, a GSM-SGSN shall only update the PDP CDR at the reception of the acknowledgement by the MS of the correct
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 GSM/UMTS systems. It is responsible for managing PDP contexts, routing data packets, and updating PDP CDRs.
explanation: The context describes the SGSN's role in managing PDP contexts, handling packet transmission, and updating PDP CDRs, which justifies its classification as a Network Function.
section_title: 5.22List of Traffic Data Volumes
biotag_Context: O,O,O,O,O,B-Protocol,O,O,O,B-Network,O,O,O,O,O,O,O,O,B-Protocol,B-Protocol,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,B-Network,B-Network Function,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,B-Network Function,O,O,B-Network Function,B-Procedure,O,O,O,O,O,O,B-Protocol,B-Message,O,O,O,O,O,B-Network Function,O,O,O,O,O,O,O,O,B-Protocol,O,O,B-Protocol,O,O,O,O,B-Network Function,O,O,O,B-Protocol,B-Message,O,O,O,O,O,O,O,O,B-Network Function,O,O,O,O,O,B-Protocol,O,O,B-Protocol,O,O,O,O,O,O,O,O,O,B-Protocol,B-Message,O,O,O,O,O,O,O,O,B-Parameter,O,O,O
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,B-Protocol,O,O,O,O,O,O,B-Protocol,O