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Content for  TS 29.281  Word version:  16.1.0

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1  ScopeWord‑p. 6

The present document defines the user plane of GTP used on:
  • the Gn and Gp interfaces of the General Packet Radio Service (GPRS);
  • the Iu, Gn and Gp interfaces of the UMTS system;
  • the S1-U, S11-U, S2a, S2b, X2, S4, S5, S8, S12, M1 and Sn interfaces of the Evolved Packet System (EPS);
  • the F1-U, Xn, N3, N9 and N19 interfaces of the 5G System (5GS);
This definition ensures full backwards compatibility with RNC, SGSN and GGSN implementations according to release 7 of TS 29.060.
Fallback from GTPv1-U to GTPv0-U shall not be supported. Therefore, 3GPP Rel-8 and onwards GTPv1-U entity should not listen to the well-known GTPv0 port 3386. If GTPv1 entity listens to the GTPv0 port, the entity shall silently discard any received GTPv0-U message.
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2  References

The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
  • References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
  • For a specific reference, subsequent revisions do not apply.
  • For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 23.003: "Numbering, addressing and identification".
[3]
TS 23.007: "Restoration procedures".
[4]
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[5]
TS 23.401: "General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access".
[6]
TS 29.060: "General Packet Radio Service (GPRS); GPRS Tunnelling Protocol (GTP) across the Gn and Gp interface".
[7]
TS 29.274: "3GPP Evolved Packet System; Evolved GPRS Tunnelling Protocol for EPS (GTPv2)".
[8]
TS 32.295: "Telecommunication management; Charging management; Charging Data Record (CDR) transfer".
[9]
RFC 768  (STD 0006): "User Datagram Protocol", J. Postel.
[10]
RFC 791  (STD 0005): "Internet Protocol", J. Postel.
[11]
RFC 4291:  "IP Version 6 Addressing Architecture".
[12]
TS 33.210: "3G security; Network Domain Security (NDS); IP network layer security".
[13]
TS 23.121: "Architectural requirements for Release 1999".
[14]
TS 43.129: "Packet-switched handover for GERAN A/Gb mode; Stage 2".
[15]
RFC 2460:  "Internet Protocol, Version 6 (IPv6) Specification".
[16]
TS 25.413: "UTRAN Iu interface RANAP signalling".
[17]
TS 36.300: "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2".
[18]
TS 23.246: "Multimedia Broadcast/Multicast Service (MBMS); Architecture and functional description; Stage 2".
[19]
RFC 4604  (2006): "Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific Multicast".
[20]
RFC 4607  (2006): "Source-Specific Multicast for IP".
[21]
TS 33.102: "3G Security; Security architecture".
[22]
TS 33.401: "3GPP System Architecture Evolution (SAE): Security architecture ".
[23]
TS 23.402: "Architecture enhancements for non-3GPP accesses".
[24]
TS 36.323: "Evolved Universal Terrestrial Radio Access (E-UTRA); Packet Data Convergence Protocol (PDCP) specification".
[25]
TS 36.425: "E-UTRAN X2 interface user plane protocol".
[26]
RFC 2474,  "Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers".
[27]
TS 36.465: "Evolved Universal Terrestrial Radio Access (E-UTRAN) and Wireless LAN (WLAN) Xw interface user plane protocol".
[28]
TS 23.501: "System Architecture for the 5G System; Stage 2".
[29]
TS 23.502: "Procedures for the 5G System; Stage 2".
[30]
TS 38.425: "NG-RAN; NR user plane protocol".
[31]
TS 38.415: "NG-RAN; PDU Session User Plane Protocol".
[32]
TS 33.250: "Security assurance specification for the PGW network product class".
[33]
TS 23.527: "5G System; Restoration Procedures".
[34]
TS 38.300: "NR; NR and NG-RAN Overall Description; Stage 2".
[35]
TS 38.323: "NR; Packet Data Convergence Protocol (PDCP) specification".
[36]
RFC 8200:  "Internet Protocol, Version 6 (IPv6) Specification"
[37]
RFC 6437:  "IPv6 Flow Label Specification".
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3  Definitions and abbreviationsWord‑p. 8

3.1  Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
Common Tunnel Endpoint Identifier (C-TEID):
Unambiguously identifies a tunnel endpoint in the receiving GTP-U protocol entity for a given UDP/IP endpoint. The sending end side of a GTP tunnel locally assigns the C-TEID value used in the TEID field and signals it to the destination Tunnel Endpoint using a control plane message.
GTP-U Message:
GTP-U (user plane) messages are either user plane messages or signalling messages. User plane messages are used to carry user data packets between GTP-U entities. Signalling messages are sent between network nodes for path management and tunnel management.GTP-U peer: node implementing at least one side of any of the GTP user plane based protocols. RNC, SGSN, GGSN, eNodeB, SGW, ePDG, gNB, N3IWF, UPF, PGW or TWAN or MME.
GTP-U Tunnel:
A GTP-U tunnel is identified in each node with a TEID, an IP address and a UDP port number. A GTP-U tunnel is necessary to enable forwarding packets between GTP-U entities.
GTP-U Tunnel Endpoint:
A GTP-U tunnel endpoint identifies a user plane context (e.g EPS bearer, PDU session or a RAB) for which a received GTP-U packet is intended. A given GTP-U tunnel endpoint may receive GTP-U packets from more than one source GTP-U peer (See clause 4.3.0).UDP/IP Path: Connection-less unidirectional or bidirectional path defined by two end-points. An IP address and a UDP port number define an end-point. A UDP/IP path carries GTP messages between network nodes related to one or more GTP tunnels.
GTP-PDU:
GTP Protocol Data Unit (PDU) is a GTP-U message, which may be either a G-PDU or a signalling message.
G-PDU:
User data packet (T-PDU) plus GTP-U header, sent between GTP network nodes.
Signalling Message:
A GTP-U message (GTP-PDU that is not a G-PDU) sent between GTP network nodes. These may be Path Management messages or Tunnel Management messages.
T-PDU:
A user data packet, for example an IP datagram, sent between a UE and a network entity in an external packet data network. A T-PDU is the payload that is tunnelled in the GTP-U tunnel.
Tunnel Endpoint Identifier (TEID):
Unambiguously identifies a tunnel endpoint in the receiving GTP-U protocol entity for a given UDP/IP endpoint. The receiving end side of a GTP tunnel locally assigns the TEID value the transmitting side has to use. The TEID values are exchanged between tunnel endpoints using control plane message.
Trusted WLAN Access Network:
see TS 23.402.
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3.2  Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
C-TEID
Common Tunnel Endpoint IDentifier
EN-DC
E-UTRA-NR Dual Connectivity
ePDG
Evolved Packet Data Gateway
GSN
GPRS Support Node
GGSN
Gateway GPRS Support Node
G-PDU
GTP encapsulated user Plane Data Unit
GTP
GPRS Tunnelling Protocol
GTP-C
GTP Control
GTP-U
GTP User
IE
Information Element
IGMP
Internet Group Management Protocol
IP
Internet Protocol
IPv4
Internet Protocol version 4
IPv6
Internet Protocol version 6
MME
Mobility Management Entity
PDU
Packet Data Unit
PGW
PDN Gateway
QoS
Quality of Service
RANAP
Radio Access Network Application Part
RNC
Radio Network Controller
SGSN
Serving GPRS Support Node
SGW
Serving Gateway
TEID
Tunnel Endpoint IDentifier
T-PDU
Transport PDU
TWAN
Trusted WLAN Access Network
UDP
User Datagram Protocol
UTRAN
UMTS Terrestrial Radio Access Network
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