Page 332 - 5G Basics - Core Network Aspects

1 Core network aspects

1 Scope
Multi-connection is the functionality which provides capability to the user equipment (UE) and network to
maintain more than one access network connection simultaneously. Furthermore, multi-connection controls
and coordinates the media sessions and components across such access network connections.
Different types of access network connections provide users with different user experiences, such as high
throughput, low delay, and high security. Multi-connection enables users to utilize any or all of the available
access network connections in support of new service scenarios. It is recognized that operators and users will
benefit from harmonization of multiple connections, such as efficient utilization of network resources, load
balancing, reliability of connection and continuity of services.

This Recommendation describes the requirements of multi-connection and provides a high-level overview of
the functionality to be addressed. The descriptions cover aspects related to service requirements, capabilities
requirements, functional requirements, and other technology requirements.

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.1706] Recommendation ITU-T Q.1706/Y.2801 (2006), Mobility management
requirements for NGN.

[ITU-T Q.2981] Recommendation ITU-T Q.2981 (1999), Broadband integrated services digital
network (B-ISDN) and broadband private integrated services network (B-PISN) –
Call control protocol.

[ITU-T T.140] Recommendation ITU-T T.140 (1998), Protocol for multimedia application text
conversation.

[ITU-T X.200] Recommendation ITU-T X.200 (1994) | ISO/IEC 7498-1:1994, 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.2011] Recommendation ITU-T Y.2011 (2004), General principles and general reference
model for Next Generation Networks.

[ITU-T Y.2012] Recommendation ITU-T Y.2012 (2010), Functional requirements and
architecture of next generation networks.

[ITU-T Y.2051] Recommendation ITU-T Y.2051 (2008), General overview of IPv6-based NGN.
[ITU-T Y.2052] Recommendation ITU-T Y.2052 (2008), Framework of multi-homing in IPv6-
based NGN.
[ITU-T Y.2091] Recommendation ITU-T Y.2091 (2007), Terms and definitions for Next
Generation Networks.
[ITU-T Y.2233] Recommendation ITU-T Y.2233 (2010), Requirements and framework allowing
accounting and charging capabilities in NGN.
[ITU-T Y.2261] Recommendation ITU-T Y.2261 (2006), PSTN/ISDN evolution to NGN.

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