name: GTP-C
full_form: GPRS Tunnelling Protocol-Control Plane
context: Node level overload control refers to advertising of the overload information at node level, i.e. overload information at node level granularity, and applying the mitigation policies towards the target node based on this information. This helps in preventing severe overload and hence potential breakdown of the GTP-C node. When a GTP-C entity determines that the offered incoming signalling traffic is growing (or is about to grow) beyond its nominal capacity, it may signal an Overload Control Information IE to instruct its GTP-C peers to reduce the offered load accordingly. Overload Control is performed independently for each direction between two GTP-C entities. Overload Control may run concurrently, but independently, for each direction between the two GTP-C entities. Overload control of SGW originated traffic towards the MME/S4-SGSN shall rely on Downlink Data Notification throttling, as specified in clause 4.3.7.4.1a of 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [3] and 5.3.6.5 of 3GPP TS 23.060[ General Packet Radio Service (GPRS); Service description; Stage 2 ]  [35], with the addition that the SGWs should be allowed, by configuration, to throttle DDN requests for low priority, as well as normal priority traffic (the SGW shall then throttle by priority DDN requests for low priority traffic).
description: The GPRS Tunnelling Protocol-Control Plane (GTP-C) is a protocol used in the control plane of mobile networks to manage and control the flow of signalling traffic between different network nodes. It plays a crucial role in preventing overload and potential breakdown of network nodes by enabling them to signal their peers to reduce the offered load when necessary. GTP-C is specifically designed for use in 3GPP networks, including those based on Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access, and is essential for maintaining efficient and reliable communication between network components.
explanation: GTP-C is classified as a Protocol because it defines the rules and procedures for controlling signalling traffic flow in mobile networks. Its primary function is to manage overload control information exchange between GTP-C entities, ensuring that network nodes can operate within their nominal capacity and prevent potential breakdowns.
section_title: 12.3.3 Node level overload control
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