3 Definitions, symbols and abbreviations

29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS

3.1 Definitions

For the purposes of the present document, the terms and definitions given in TR 21.905 [1] 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 [1].

GTP-PDU: GTP Protocol Data Unit is either a GTP-C Message or a GTP-U Message. GTP-U Message may be either a signalling message across the user plane tunnel, or a G-PDU (see clause 6).

– Signalling Message: any GTP-PDU (GTP-C or GTP-U) except the G-PDU.

– G-PDU: GTP user plane message, which carries the original packet (payload). G-PDU consists of GTP-U header and a T-PDU.

– T-PDU: original packet, for example an IP datagram, from an UE or a network node in an external packet data network. A T-PDU is the payload that is tunnelled in the GTP-U tunnel.

– GTP-C Message: GTP control plane message type of a GTP-PDU. GTP-C message consists of GTP-C header, which is followed by zero or more information elements.

– GTP-U Message: GTP user plane message. The user plane messages are used to carry user data packets, and also signalling messages e.g. for path management and error indication. Therefore, GTP-U message consists of GTP-U header, which is followed by either a T-PDU, or zero or more information elements.

GTP Tunnel: A GTP tunnel is a communication tunnel between two GTP nodes (see clause 4.1 "GTP Tunnel").

PDN Connection: "PDN Connection" in this specification only refers to the PDN connection through the SGW and PGW.

RLOS attached UE: A UE is attached only for accessing Restricted Local Operator Services.

SCEF PDN Connection: The PDN connection to the SCEF. Unless otherwise indicated in a clause or clause, "PDN Connections" do not refer to any SCEF PDN Connection.

Tunnel Endpoint: A tunnel endpoint is identified with a TEID, an IP address and a UDP port number (see clause 4.1 "GTP Tunnel").

Tunnel Endpoint Identifier (TEID): unambiguously identifies a tunnel endpoint in scope of a path (see clause 4.1 "GTP Tunnel").

3.2 Symbols

For the purposes of the present document, the following symbols apply:

S1-U Interface between SGW and eNodeB

X2 Interface between eNodeBs

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in TR 21.905 [1] 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 [1].

5GC 5G Core Network

AMBR Aggregate Maximum Bit Rate

APN Access Point Name

APN-NI Access Point Name Network Identifier

APN-OI Access Point Name Operator Identifier

C-MSISDN Correlation MSISDN

EBI EPS Bearer ID

eNodeB Evolved Node B

EPC Evolved Packet Core

ePDG Evolved Packet Data Gateway

EPS Evolved Packet System

F-TEID Fully Qualified Tunnel Endpoint Identifier

G-PDU GTP-U non-signalling PDU

GPRS General Packet Radio Service

GTP GPRS Tunnelling Protocol

GTP-PDU GTP-C PDU or GTP-U PDU

GTPv2-C GTP version 2, control plane

GTPv2-U GTP version 2, user plane

IMSI International Mobile Subscriber Identity

IP Internet Protocol

LBI Linked EPS Bearer ID

L1 Layer 1

L2 Layer 2

LGW Local Gateway

LIPA Local IP Access

MBMS Multimedia Broadcast/Multicast Service

MEI Mobile Equipment Identity

MSISDN Mobile Subscriber ISDN Number

MT-EDT Mobile Terminated Early Data Transmission

NBIFOM Network-based IP Flow Mobility

NTP Network Time Protocol

PAA PDN Address Allocation

PCO Protocol Configuration Options

PDU Protocol Data Unit

PDN Packet Data Network or Public Data Network

PGW PDN Gateway

PTI Procedure Transaction Id

PSCell Primary SCG (Secondary Cell Group) Cell

QoS Quality of Service

RAT Radio Access Technology

RIM RAN Information Management

RLOS Restricted Local Operator Services

SGW Serving Gateway

SPID Subscriber Profile ID for RAT/Frequency Priority

STN-SR Session Transfer Number for SRVCC

TEID Tunnel Endpoint Identifier

TEID-C Tunnel Endpoint Identifier, control plane

TEID-U Tunnel Endpoint Identifier, user plane

TFT Traffic Flow Template

TLIV Type Length Instance Value

TWAN Trusted WLAN Access Network

UAS Uncrewed Aerial System

UAV Uncrewed Aerial Vehicle

UDP User Datagram Protocol

ULI User Location Information

USS UAS Service Supplier