Page 350 - 5G Basics - Core Network Aspects

1 Core network aspects

1 Scope
In the multi-connection environment, a user equipment (UE) can have various capabilities through the
available resources (e.g., access network information, network prefixes, IP addresses, etc.) by maintaining
simultaneous connections. To achieve these advantages at a multi-connection UE (MUE), these resources are
required to be identified and handled at the UE side. This Recommendation relies on the multi-connection
architecture [ITU-T Y.2027] to describe the relationship between resource identifiers at the MUE and the
multi-connection functional architecture.
This Recommendation describes the identification of the available resources given by different types of
simultaneous connections at the UE side. Resource identifiers are required to be configured in order to
achieve efficient utilization and harmonization through interaction between the MUE and the multi-
connection functional entities within the network. This Recommendation provides a way to relate these
resources with the multi-connection framework in NGN.

2 References
The following ITU-T Recommendations and other references contain provisions which, through reference in
this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated
were valid. All Recommendations and other references are subject to revision; users of this Recommendation
are therefore encouraged to investigate the possibility of applying the most recent edition of the
Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is
regularly published. The reference to a document within this Recommendation does not give it, as a stand-
alone document, the status of a Recommendation.

[ITU-T Q.1742.1] Recommendation ITU-T Q.1742.1 (2002), IMT-2000 references to ANSI-41 evolved core
network with cdma2000 access network.
[ITU-T X.200] Recommendation ITU-T X.200 (1994), Information technology – Open Systems
Interconnection – Basic Reference Model: The basic model.
[ITU-T Y.1221] Recommendation ITU-T Y.1221 (2010), Traffic control and congestion control in IP-based
networks.
[ITU-T Y.2012] Recommendation ITU-T Y.2012 (2010), Functional requirements and architecture of next
generation networks.
[ITU-T Y.2027] Recommendation ITU-T Y.2027 (2012), Functional architecture of multi-connection.

[ITU-T Y.2091] Recommendation ITU-T Y.2091 (2011), Terms and definitions for next generation
networks.
[ITU-T Y.2201] Recommendation ITU-T Y.2201 (2009), Requirements and capabilities for ITU-T NGN.
[ITU-T Y.2251] Recommendation ITU-T Y.2251 (2011), Multi-connection Requirements.

3 Definitions

3.1 Terms defined elsewhere

This Recommendation uses the following terms defined elsewhere:
3.1.1 connection [ITU-T X.200]: A connection is an association established for the transfer of data
between two or more peer-(N)-entities. This association binds the peer-(N)-entities together with the (N–1)-
entities in the next lower layer.
3.1.2 IP flow [ITU-T Y.2251]: An IP flow at a given interface is defined as the occurrence at that interface
of the set of IP packets, which match a given classification. An IP flow may consist of packets from a single
application session, or it may be an aggregation comprising the combined traffic from a number of application

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