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Content for  TR 22.896  Word version:  12.0.0

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1  ScopeWord‑p. 5
The present document studies use cases and potential requirements for Continuity of Data Sessions of a UE to Local Networks.
Local IP Access (LIPA) signifies the capability of a UE to obtain access to a local residential/enterprise IP network (subsequently called a local network) that is connected to one or more H(e)NBs and to communicate with entities in the local network through Data Sessions. Basic functionality for Local IP Access (LIPA) has been specified in 3GPP Rel-10.
The current study item investigates extending LIPA functionality to allow access to the local network when a UE is under coverage of the macro network and provide related mobility support.
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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 22.220: " Service requirements for Home NodeBs and Home eNodeBs"
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3  Definitions and abbreviations

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.
No specific definition.

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.
MRA
Managed Remote Access to home based network (see [2])

4  BackgroundWord‑p. 6

4.1  General Description

Basic functionality for Local IP Access (LIPA) has been specified in TS 22.220 in Rel-10.
LIPA signifies the capability of a UE to obtain access to a local residential/enterprise IP network (subsequently called a local network) that is connected to one or more H(e)NBs. LIPA allows a UE to connect to devices in the local network - e.g. printers, video cameras, or a local web-server.
If the local network offers services that enable exchange of digital content (e.g. UPnP) LIPA also allows the UE to discover supporting devices and to be discovered.
Additionally to LIPA an operator may, e.g. as a chargeable user service, also wish to provide access to the local network when a UE is under coverage of the macro network or a H(e)NB that is not connected to that local network. Access to the local network when a UE is under coverage of the macro network or a H(e)NB that is not connected to that local network has been described in TS 22.220 section 5.8 under the name of "Managed Remote Access to home based network" (MRA).
From user's perspective LIPA and MRA describe the same service, namely access to a local network. The only difference is whether the UE is under coverage of a H(e)NB in that local network or not. Therefore an ongoing data session between the UE and the local network should continue when the UE changes access :
  • between H(e)NB in that local network and (e)NB/H(e)NB that is not connected to that local network;
  • between (e)NBs and H(e)NBs that are not connected to that local network.
SA2 is currently investigating solutions for LIPA (and SIPTO) mobility which should be enabled in Rel-11.
In the context of this TR "Continuity of service" signifies continuity of UE access to the local IP network
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