Page 351 - 5G Basics - Core Network Aspects

Core network aspects 1

sessions. When a classification may be subdivided into different sub-classifications (separate or overlapping),
different IP sub flows may be recognized in the corresponding IP flow.
NOTE 1 – In this Recommendation, a session is identified by a session identifier (SEID).
NOTE 2 – In this Recommendation, an IP flow is identified by an Internet protocol flow identifier (FLID). When a
classification may be subdivided into different sub-classifications, these separate sub-classifications are identified by
different FLIDs.
3.1.3 multi-connection user equipment (MUE) [ITU-T Y.2027]: A user equipment which can support two
or more network connections simultaneously under the control of a network enhanced for multi-connection
capability.

3.2 Terms defined in this Recommendation

This Recommendation defines the following terms:
3.2.1 lower abstraction point (LAP): A conceptual place that exists in the lower part between two
adjacent layers where various relations are established between layers.
3.2.2 multi-connection: The collection of several connections between two or more peer-(N)-entities
simultaneously. At least one of the connections is associated with a physical layer connectivity different from
the rest of the connections. All connections are coordinated with each other to provide service to higher
layer entities.
NOTE – In [ITU-T Y.2251], multi-connection is defined as the functionality which provides capability to the user
equipment and network to maintain more than one access network connection simultaneously.
3.2.3 upper abstraction point (UAP): A conceptual place that exists in the upper part between two
adjacent layers where various relations are established between layers.

4 Abbreviations and acronyms
This Recommendation uses the following abbreviations and acronyms:

3G Third Generation
AC-FE Access Control FE
ANID Access Network Identifier

APN Access Point Name
FE Functional Entity

FLID Internet protocol Flow Identifier
ID Identifier
IFID Interface Identifier

IMPI IP Multimedia Private Identity
IMPU IP Multimedia Public identity

IP Internet Protocol
ISM Industrial, Scientific and Medical

LAN Local Area Network
LAP Lower Abstraction Point

MAC Media Access Control
MAS-F Multi-connection Application Support Function
MC Multi-Connection

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