name: GTP'
full_form: The GPRS protocol used for CDR transport. It is derived from GTP with enhancements to improve transport reliability necessary for CDRs.
context: In GTP' messaging only the signalling plane of GTP is partly reused. The GTP' header is shown in Figure 8. Bit 5 of octet 1 of the GTP header is the Protocol Type (PT) flag and is '0' if the message is GTP'. The Version bits indicate the GTP' protocol version when the Protocol Type flag is '0'. Bit 1 of octet 1 is not used in GTP' (except in v0), and it is marked '0' in the GTP' header. It is in use in GTP' v0 and distinguishes the used header-length. In the case of GTP' v0, this bit being marked one (1) indicates the usage of the 6 octets header. If the bit is set to '0' (usually the case) the 20-octet header is used. For all other versions of GTP' this bit is not used and is set to '0'. However, this does not suggest the use of the 20-octet header, rather a shorter 6-octet header. The Length indicates the length of payload (number of octets after the GTP' header). The Sequence Number of the packet is part of the GTP' header. Figure 8: GTP' header
description: GTP' is a protocol derived from GTP with enhancements for reliable transport, specifically designed for CDR (Charging Data Record) transport in the context of 3GPP TS 32.215.
explanation: The text states that GTP' is a protocol used for CDR transport and mentions its reliability improvements, directly classifying it as a Protocol.
section_title: 7.2.1Usage of GTP Header in charging
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