name: GTP
full_form: GPRS Tunnelling Protocol
context: Figure 64: Reroute NAS Request procedure: Successful operation. The SGSN initiates the procedure by sending a REROUTE NAS REQUEST message to the RNC. The RNC shall, if supported, reroute the INITIAL UE MESSAGE message to the DCN indicated by the SGSN Group Identity IE. If the P-TMSI IE is included in the REROUTE NAS REQUEST message, then the RNC shall if supported, use it when selecting the SGSN node in the DCN as defined in TS 23.401 [48]. If the UE Usage Type IE is included in the REROUTE NAS REQUEST message, then the RNC shall if supported, include it towards the selected SGSN node in the DCN as defined in TS 23.401 [48].
description: The GPRS Tunnelling Protocol (GTP) is used in the Evolved Packet Core (EPC) to tunnel user plane traffic between network nodes like the Serving Gateway (S-GW) and the Packet Data Network Gateway (P-GW). It establishes and manages tunnels for user plane data transmission within E-RABs (EPS Radio Access Bearers). GTP enables control message exchange between nodes for managing bearer resources, mobility, and session establishment.
explanation: GTP is classified as a Protocol because it defines the rules and procedures for managing user plane traffic and establishing tunnels between network nodes. The text emphasizes GTP's role in data forwarding, bearer management, and session control, which are core functions of a protocol.
section_title: 10.3.1	EN-DC
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biotag_Description: O,B-Protocol,I-Protocol,I-Protocol,O,O,O,O,O,B-Network,I-Network,I-Network,O,O,O,O,O,O,O,O,O,O,O,B-Network Function,I-Network Function,O,O,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-Protocol,O,O,O,O,O,O,O,O,O,O,O,O,O,O