name: GTP
full_form: GPRS Tunneling Protocol
context: A protocol error is defined as a message or an Information Element received from a peer entity with unknown type, or if it is unexpected, or if it has an erroneous content. The term silently discarded is used in the following clauses to mean that the receiving GTP entity's implementation shall discard such a message without further processing, or that the receiving GTP entity discards such an IE and continues processing the message. The conditions for the receiving GTP entity to silently discard an IE are specified in the subsequent clauses. The handling of unknown, unexpected or erroneous GTP messages and IEs shall provide for the forward compatibility of GTP. Therefore, the sending GTP entity shall be able to safely include in a message a new conditional-optional or an optional IE. Such an IE may also have a new type value. Any legacy receiving GTP entity shall, however, silently discard such an IE and continue processing the message. If a protocol error is detected by the receiving GTP entity, it should log the event including the erroneous message and may include the error in a statistical counter. For Request messages and Response messages without a rejection Cause value, the following applies: - An information element with "Mandatory" in the "Presence requirement" column of a message definition shall always be present in that message. - An information element with "Conditional" in the "Presence requirement" column of a message definition shall be sent when the conditions detailed in the "Condition / Comment" column are met. For Response messages containing a rejection Cause value, see clause 6.1.1. The Version Not Supported Indication message shall be considered as a Triggered message as specified in clause 4.2.5 "Messages with GTPv2 defined replies: Classification of Initial and Triggered Messages". The receiving GTP entity shall apply the error handling specified in the subsequent clauses in decreasing priority. If the received erroneous message is a reply to an outstanding GTP message, the GTP transaction layer shall stop retransmissions and notify the GTP application layer of the error even if the reply is silently discarded.
description: The GPRS Tunneling Protocol (GTP) is a protocol used in mobile communication networks to manage the tunneling of packets between different network elements. It plays a crucial role in ensuring efficient and reliable data transmission within the network, particularly in scenarios involving roaming or inter-network communications. The protocol handles tasks such as packet encapsulation, routing, and error handling, adhering to specifications outlined by 3GPP for seamless integration with other network functions.
explanation: GTP is classified as a Protocol because it defines rules and procedures for data transmission between different entities within the mobile communication network. The provided context highlights its role in managing packet tunneling, error detection, and handling, which are fundamental aspects of protocol operations in telecommunications.
section_title: 7.7.1 Protocol Errors
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